/* roulang page: index */
:root {
  --bg: #0B0E0D;
  --surface: #111513;
  --card: #171C19;
  --card-hover: #1C221E;
  --accent: #C8F542;
  --accent-ink: #111803;
  --text-primary: #F2F3EC;
  --text-secondary: #A7AEA5;
  --text-muted: #6B746C;
  --border: rgba(240,243,236,0.08);
  --border-strong: rgba(240,243,236,0.16);
  --danger: #FF4B3A;
  --radius-card: 12px;
  --radius-media: 16px;
  --radius-btn: 8px;
  --shadow-1: 0 12px 32px rgba(0,0,0,0.18);
  --shadow-2: 0 18px 40px rgba(0,0,0,0.28);
  --ease: cubic-bezier(0.2, 0, 0, 1);
  --font-stack: "PingFang SC", "HarmonyOS Sans", "MiSans", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { overflow-x: hidden; }
body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.8;
  background: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}
a { color: inherit; text-decoration: none; transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease); }
img { display: block; max-width: 100%; }
button, input, textarea { font-family: inherit; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-tight { padding: 48px 0; }
h1, h2, h3, h4 { color: var(--text-primary); letter-spacing: -0.01em; line-height: 1.2; font-weight: 750; }
.sec-line { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 44px; }
.sec-line-head { max-width: 720px; }
.sec-line-link { color: var(--text-secondary); font-size: 14px; display: inline-flex; align-items: center; gap: 8px; border-bottom: 1px solid transparent; white-space: nowrap; }
.sec-line-link:hover { color: var(--accent); border-bottom-color: var(--accent); }
.sec-overline { font-size: 13px; letter-spacing: 0.08em; color: var(--accent); font-weight: 600; display: block; margin-bottom: 12px; text-transform: uppercase; }
.sec-title { font-size: clamp(30px, 4vw, 44px); line-height: 1.2; font-weight: 800; }

/* header */
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 100; height: 72px; background: rgba(11,14,13,0.7); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); border-bottom: 1px solid var(--border); transition: height 0.3s var(--ease), background 0.3s var(--ease), box-shadow 0.3s var(--ease); }
.site-header.scrolled { height: 60px; background: rgba(11,14,13,0.86); box-shadow: 0 8px 32px rgba(0,0,0,0.22); }
.header-grid { height: 72px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; transition: height 0.3s var(--ease); }
.site-header.scrolled .header-grid { height: 60px; }
.nav-side { display: flex; align-items: center; gap: 4px; }
.nav-left { justify-content: flex-start; }
.nav-right { justify-content: flex-end; gap: 8px; }
.nav-item { margin: 0 8px; padding: 24px 0 20px; font-size: 15px; font-weight: 550; color: var(--text-secondary); position: relative; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; line-height: 1; }
.nav-item::after { content: ""; position: absolute; left: 0; bottom: 8px; width: 100%; height: 2px; border-radius: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform 0.25s var(--ease); }
.nav-item:hover { color: #fff; }
.nav-item:hover::after { transform: scaleX(1); }
.nav-item.active { color: #fff; }
.nav-item.active i.dot { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); display: inline-block; margin-right: 4px; flex: 0 0 auto; }
.nav-item.active::after { transform: scaleX(1); }
.nav-cta { display: inline-flex; align-items: center; justify-content: center; height: 38px; padding: 0 20px; border-radius: var(--radius-btn); background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 14px; margin-left: 8px; line-height: 1; white-space: nowrap; }
.nav-cta:hover { background: #d6fc66; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(200,245,66,0.2); color: var(--accent-ink); }
.brand-lockup { display: flex; align-items: center; justify-content: center; padding: 0 22px; }
.brand-lockup a { display: flex; align-items: center; gap: 10px; }
.brand-badge { width: 38px; height: 38px; border-radius: 9px; background: var(--accent); color: var(--accent-ink); font-weight: 900; font-size: 20px; display: flex; align-items: center; justify-content: center; transform: rotate(-3deg); flex: 0 0 auto; }
.brand-name { font-size: 21px; font-weight: 800; letter-spacing: -0.01em; color: var(--text-primary); white-space: nowrap; }
.burger { display: none; width: 44px; height: 44px; background: transparent; border: 0; cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 5px; border-radius: 8px; }
.burger span { display: block; width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: transform 0.2s var(--ease), opacity 0.2s var(--ease); }
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.m-header-actions { display: none; align-items: center; gap: 8px; }
.mobile-menu { position: fixed; top: 72px; left: 0; width: 100%; z-index: 99; background: #0C0F0E; border-bottom: 1px solid var(--border-strong); padding: 12px 20px 20px; display: none; opacity: 0; transform: translateY(-8px); transition: all 0.2s var(--ease); }
.mobile-menu.openmenu { display: block; opacity: 1; transform: translateY(0); }
.mobile-menu a.m-link { display: block; padding: 13px 12px; border-radius: 10px; font-size: 16px; font-weight: 600; color: var(--text-primary); }
.mobile-menu a.m-link:hover { background: rgba(255,255,255,0.04); color: var(--accent); }
.mobile-menu a.m-btn { display: flex; align-items: center; justify-content: center; height: 46px; background: var(--accent); color: var(--accent-ink); border-radius: var(--radius-btn); font-weight: 700; margin-top: 12px; }
@media (max-width: 1023px) {
  .nav-left .nav-item, .nav-right .nav-item { display: none; }
  .burger { display: flex; }
  .m-header-actions { display: flex; }
  .header-grid { grid-template-columns: auto 1fr auto; }
  .brand-lockup { padding: 0; }
  .brand-name { font-size: 18px; }
  .brand-badge { width: 34px; height: 34px; font-size: 18px; border-radius: 8px; }
  .nav-right .nav-cta { display: none; }
  .nav-cta-mobile { display: inline-flex; align-items: center; justify-content: center; height: 38px; padding: 0 16px; border-radius: var(--radius-btn); background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 14px; }
}
@media (min-width: 1024px) {
  .nav-cta-mobile, .m-header-actions .burger { display: none; }
  .mobile-menu { display: none !important; }
}
/* hero */
.hero { min-height: 72vh; min-height: max(480px, 72vh); position: relative; overflow: hidden; display: flex; align-items: flex-end; padding-top: 160px; }
.hero-slides { position: absolute; inset: 0; z-index: 0; }
.hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.4s var(--ease); background-size: cover; background-position: center; }
.hero-slide.active { opacity: 1; }
.hero-overlay { position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, rgba(11,14,13,0.92) 0%, rgba(11,14,13,0.45) 60%, rgba(11,14,13,0.35) 100%), linear-gradient(0deg, rgba(11,14,13,0.98) 0%, transparent 45%); }
.hero-content { position: relative; z-index: 2; width: 100%; padding: 0 24px 80px; }
.hero-inner { max-width: 1280px; margin: 0 auto; }
.hero-overline { display: inline-flex; align-items: center; gap: 8px; background: rgba(200,245,66,0.1); border: 1px solid rgba(200,245,66,0.28); color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: 0.04em; padding: 5px 14px; border-radius: 999px; margin-bottom: 22px; }
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--danger); display: inline-block; animation: pulse-dot 1.6s infinite; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; transform: scale(1);} 50% { opacity: 0.45; transform: scale(0.8);} }
.hero h1.entry-title { font-size: clamp(40px, 6vw, 78px); line-height: 1.05; font-weight: 800; letter-spacing: -0.02em; max-width: 11em; margin-bottom: 18px; }
.hero-deco { color: var(--accent); }
.hero-sub { font-size: clamp(16px, 2.2vw, 22px); color: var(--text-secondary); max-width: 720px; margin-bottom: 30px; line-height: 1.7; }
.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-bottom: 28px; }
.btn { display: inline-flex; align-items: center; justify-content: center; height: 48px; padding: 0 28px; border-radius: var(--radius-btn); font-weight: 700; font-size: 16px; line-height: 1; transition: all 0.25s var(--ease); border: 1px solid transparent; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #d6fc66; box-shadow: 0 10px 30px rgba(200,245,66,0.22); color: var(--accent-ink); transform: translateY(-2px); }
.btn-secondary { background: transparent; border-color: rgba(242,243,236,0.25); color: var(--text-primary); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-lg { height: 54px; padding: 0 36px; font-size: 17px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 28px; align-items: center; color: var(--text-secondary); font-size: 14px; }
.hero-meta .hb { color: var(--text-primary); }
.scroll-down { position: absolute; left: 50%; bottom: 28px; transform: translateX(-50%); z-index: 3; width: 28px; height: 44px; border-radius: 20px; border: 1px solid rgba(242,243,236,0.25); display: flex; align-items: flex-start; justify-content: center; padding-top: 10px; cursor: default; }
.scroll-down::before { content: ""; width: 3px; height: 9px; border-radius: 4px; background: var(--accent); animation: scrollMove 1.6s infinite; }
@keyframes scrollMove { 0% { transform: translateY(0); opacity: 1;} 100% { transform: translateY(14px); opacity: 0;} }

/* live rail */
.live-strip { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.rail-wrap { overflow-x: auto; display: flex; gap: 20px; padding: 8px 0 20px; scroll-snap-type: x mandatory; scrollbar-width: thin; scrollbar-color: rgba(200,245,66,0.2) transparent; }
.rail-wrap::-webkit-scrollbar { height: 6px; }
.rail-wrap::-webkit-scrollbar-track { background: rgba(255,255,255,0.02); border-radius: 6px; }
.rail-wrap::-webkit-scrollbar-thumb { background: rgba(200,245,66,0.16); border-radius: 6px; }
.rail-card { scroll-snap-align: start; flex: 0 0 clamp(240px, 23vw, 320px); background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-card); overflow: hidden; transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease); }
.rail-card:hover { transform: translateY(-6px); border-color: rgba(200,245,66,0.28); box-shadow: var(--shadow-2); }
.rail-media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: var(--surface); }
.rail-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.rail-card:hover .rail-media img { transform: scale(1.04); }
.rail-badge { position: absolute; top: 10px; left: 10px; z-index: 2; display: flex; gap: 6px; }
.badge { display: inline-flex; align-items: center; height: 24px; padding: 0 9px; border-radius: 999px; font-size: 12px; font-weight: 700; letter-spacing: 0.03em; line-height: 1; }
.badge-live { background: var(--danger); color: #fff; }
.badge-live::before { content: ""; width: 5px; height: 5px; background: #fff; border-radius: 50%; margin-right: 6px; animation: pulse-dot 1.3s infinite; }
.badge-hd { background: rgba(242,243,236,0.13); color: var(--text-primary); backdrop-filter: blur(8px); }
.badge-replay { background: var(--accent); color: var(--accent-ink); }
.rail-gradient { position: absolute; inset: 0; background: linear-gradient(0deg, rgba(0,0,0,0.75) 0%, transparent 42%); }
.rail-play { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.3s var(--ease); }
.rail-play i { width: 48px; height: 48px; border: 1px solid rgba(255,255,255,0.7); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 15px; background: rgba(11,14,13,0.18); }
.rail-card:hover .rail-play { opacity: 1; }
.rail-body { padding: 14px 16px 18px; }
.rail-title { font-size: 16px; font-weight: 700; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 46px; }
.rail-meta { color: var(--text-muted); font-size: 13px; margin-top: 8px; display: flex; align-items: center; gap: 8px; }
.rail-meta i { color: var(--text-muted); font-size: 12px; }

/* CMS post rail */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.post-card { display: flex; flex-direction: column; width: 100%; height: 100%; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-card); overflow: hidden; transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease); }
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); border-color: rgba(200,245,66,0.22); }
.post-media { aspect-ratio: 16 / 9; overflow: hidden; background: var(--surface); position: relative; }
.post-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.post-card:hover .post-media img { transform: scale(1.04); }
.post-cat { position: absolute; left: 12px; top: 12px; z-index: 2; }
.cat-chip { display: inline-flex; height: 24px; padding: 0 10px; background: rgba(197,245,66,0.92); border-radius: 999px; color: var(--accent-ink); font-size: 12px; font-weight: 700; align-items: center; line-height: 1; }
.post-body { display: flex; flex: 1; flex-direction: column; padding: 18px 18px 20px; }
.post-title { font-size: 17px; font-weight: 700; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 8px; min-height: 50px; }
.post-excerpt { font-size: 14px; line-height: 1.8; color: var(--text-secondary); flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 16px; }
.post-foot { display: flex; justify-content: space-between; align-items: center; color: var(--text-muted); font-size: 13px; margin-top: auto; }
.post-date { display: flex; align-items: center; gap: 6px; }
.post-read { color: var(--text-secondary); display: inline-flex; align-items: center; gap: 4px; font-weight: 600; transition: color 0.2s; }
.post-card:hover .post-read { color: var(--accent); }
.empty-cms { grid-column: 1 / -1; background: transparent; border: 1px dashed rgba(242,243,236,0.2); border-radius: var(--radius-card); min-height: 140px; display: flex; align-items: center; justify-content: center; text-align: center; width: 100%; }
.empty-inner { color: var(--text-secondary); font-size: 16px; }
.empty-inner i { display: block; font-size: 30px; color: var(--text-muted); margin-bottom: 12px; }

/* featured hot */
.hot-wrap { display: grid; grid-template-columns: 1.7fr 1fr; gap: 24px; }
.hot-main-card { position: relative; border-radius: var(--radius-media); overflow: hidden; min-height: 390px; display: flex; align-items: flex-end; background-size: cover; background-position: center; border: 1px solid var(--border); }
.hot-main-card::before { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(11,14,13,0.92) 0%, rgba(11,14,13,0.08) 60%); z-index: 1; }
.hot-no { position: absolute; top: 20px; right: 28px; font-size: 120px; font-weight: 900; color: rgba(242,243,236,0.08); line-height: 1; z-index: 1; letter-spacing: -0.04em; }
.hot-main-body { position: relative; z-index: 2; padding: 32px; width: 100%; }
.hot-tag { margin-bottom: 12px; }
.tag-pill { display: inline-flex; align-items: center; height: 26px; padding: 0 12px; border-radius: 999px; background: rgba(200,245,66,0.22); color: var(--accent); font-size: 12px; font-weight: 650; border: 1px solid rgba(200,245,66,0.18); }
.hot-main-title { font-size: clamp(26px, 3vw, 38px); font-weight: 800; margin-bottom: 12px; line-height: 1.3; max-width: 12em; }
.hot-main-text { color: var(--text-secondary); font-size: 15px; max-width: 30em; }
.hot-right-cards { display: flex; flex-direction: column; gap: 24px; }
.hot-side-card { display: grid; grid-template-columns: 0.5fr auto; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-card); overflow: hidden; min-height: 180px; transition: transform 0.3s var(--ease), border-color 0.3s var(--ease); position: relative; }
.hot-side-body { padding: 24px 15px 24px 24px; z-index: 2; position: relative; }
.hot-side-subject { font-size: 18px; font-weight: 750; line-height: 1.5; margin-bottom: 8px; position: relative; z-index: 2; }
.hot-side-desc { color: var(--text-secondary); font-size: 13.5px; line-height: 1.7; position: relative; z-index: 2; }
.hot-link { color: var(--text-secondary); font-size: 13px; margin-top: 14px; display: inline-flex; gap: 6px; align-items: center; position: relative; z-index: 2; }
.hot-link:hover, .hot-side-card:hover .hot-link { color: var(--accent); }
.hot-side-thumb { width: 90px; grid-column: 2; position: relative; overflow: hidden; background: var(--surface); }
.hot-side-thumb img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.hot-side-no { position: absolute; bottom: -14px; right: 16px; font-size: 80px; font-weight: 900; color: rgba(242,243,236,0.07); z-index: 1; line-height: 1; }

/* topic playlist */
.topic-block { margin-bottom: 64px; }
.topic-head { display: grid; grid-template-columns: 120px 1fr; gap: 32px; align-items: start; border-bottom: 1px solid var(--border); padding-bottom: 24px; margin-bottom: 24px; }
.topic-index { font-size: 13px; font-weight: 600; color: var(--accent); letter-spacing: 0.06em; padding-top: 6px; }
.topic-title-row { display: flex; align-items: baseline; gap: 20px; flex-wrap: wrap; }
.topic-title { font-size: 26px; font-weight: 800; letter-spacing: -0.01em; }
.topic-sub { color: var(--text-secondary); font-size: 14px; }
.topic-row-list { display: flex; flex-direction: column; }
.topic-item { display: flex; align-items: center; gap: 18px; padding: 14px 12px; border-radius: 12px; transition: background 0.22s var(--ease); cursor: pointer; }
.topic-item:hover { background: rgba(255,255,255,0.035); }
.topic-thumb { width: 132px; flex: 0 0 132px; aspect-ratio: 16/9; border-radius: 9px; overflow: hidden; background: var(--surface); transition: transform 0.3s var(--ease); }
.topic-item:hover .topic-thumb { transform: translateY(-3px); }
.topic-thumb img { width: 100%; height: 100%; object-fit: cover; }
.topic-info { flex: 1; min-width: 0; }
.topic-name { font-size: 17px; font-weight: 650; line-height: 1.5; margin-bottom: 4px; text-overflow: ellipsis; overflow: hidden; white-space: nowrap; }
.topic-meta { font-size: 13px; color: var(--text-muted); display: flex; gap: 14px; flex-wrap: wrap; }
.topic-arrow { color: var(--text-muted); font-size: 18px; flex: 0 0 auto; transition: all 0.2s; }
.topic-item:hover .topic-arrow { color: var(--accent); transform: translateX(6px); }
@media (max-width: 760px) {
  .topic-head { grid-template-columns: auto 1fr; gap: 10px; }
  .topic-thumb { width: 96px; flex-basis: 96px; }
  .topic-name { font-size: 15px; }
}

/* faq */
.faq-wrap { max-width: 920px;margin:0 auto; }
.faq-panel { border-bottom: 1px solid var(--border); }
.faq-panel:first-of-type { border-top: 1px solid var(--border); }
.accordion-title { background: transparent !important; border: 0 !important; padding: 26px 46px 22px 4px !important; font-family: var(--font-stack) !important; font-size: 18px !important; font-weight: 650 !important; color: var(--text-primary) !important; display: block; position: relative; line-height: 1.5; border-radius: 0 !important; }
.accordion-title:hover { background: transparent !important; color: var(--accent) !important; }
.accordion-title::before { content: none !important; }
.accordion-title::after { content: "+" !important; position: absolute !important; right: 14px !important; top: 50% !important; transform: translateY(-50%) !important; width: 22px !important; height: 22px !important; display: flex; align-items: center; justify-content: center; color: var(--text-secondary) !important; font-size: 24px !important; font-weight: 300; border: 1px solid var(--border-strong); border-radius: 50%; transition: all 0.25s var(--ease); line-height: 1 !important; }
.accordion-title.is-active::after { content: "−" !important; color: var(--accent) !important; border-color: var(--accent); }
.accordion-content { background: transparent !important; border: 0 !important; color: var(--text-secondary) !important; padding: 0 34px 28px 4px !important; }
.accordion-content p { font-size: 15px; line-height: 1.9; color: var(--text-secondary); margin-bottom: 0; }

/* bottom cta */
.cta-banner { overflow: hidden; position: relative; padding: 88px 0; display: flex; align-items: center; background-size: cover; background-position: center 70%; border-radius: var(--radius-media); }
.cta-banner::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11,14,13,0.96) 0%, rgba(11,14,13,0.75) 55%, rgba(11,14,13,0.4) 100%); z-index: 1; }
.cta-banner-content { position: relative; z-index: 2; width: 100%; }
.cta-grid { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.cta-title { font-size: clamp(30px, 4.5vw, 48px); line-height: 1.2; font-weight: 800; margin-bottom: 14px; }
.cta-text { max-width: 520px; color: var(--text-secondary); font-size: 16px; margin-bottom: 0; line-height: 1.8; }
.cta-right { flex: 0 0 auto; }
@media (max-width: 900px) {
  .cta-grid { flex-direction: column; align-items: flex-start; gap: 30px; }
}
/* footer */
.site-footer { background: #0A0D0C; border-top: 1px solid var(--border); }
.footer-grid { padding: 72px 0 40px; grid-template-columns: 1.5fr 1fr 1fr 1fr; }
.footer-brand { margin-bottom: 22px; display: flex; align-items: center; gap: 12px; }
.footer-brand-logo { width: 40px; height: 40px; border-radius: 9px; background: var(--accent); color: var(--accent-ink); display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 20px; }
.footer-brand-name { font-size: 20px; font-weight: 800; }
.footer-desc { color: var(--text-secondary); font-size: 14px; max-width: 320px; line-height: 1.9; }
.footer-col h4 { font-size: 15px; letter-spacing: 0.06em; margin-bottom: 20px; color: var(--text-primary); font-weight: 700; }
.footer-col .f-link { display: block; color: var(--text-secondary); font-size: 14px; padding: 4px 0; transition: color 0.2s; }
.footer-col .f-link:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding: 24px 0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; color: var(--text-muted); font-size: 13px; }
.footer-bottom-copy a { color: var(--text-secondary); }
.footer-bottom-copy a:hover { color: var(--accent); }
#backTop { position: fixed; right: 24px; bottom: 32px; width: 44px; height: 44px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; color: var(--text-primary); z-index: 500; cursor: pointer; opacity: 0; visibility: hidden; transition: all 0.3s var(--ease); }
#backTop.visible { opacity: 1; visibility: visible; }
#backTop:hover { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
::selection { background: rgba(200,245,66,0.2); color: #fff; }
@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: 1fr 1fr; row-gap: 36px; }
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .hot-wrap { grid-template-columns: 1fr; }
  .hot-main-card { min-height: 320px; }
  .section { padding: 68px 0; }
}
@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .section { padding: 56px 0; }
  .header-grid { height: 60px; }
  .site-header { height: 60px; }
  h1.hero-h1.entry-title { font-size: 36px; }
  .post-grid { grid-template-columns: 1fr; }
  .rail-wrap { padding-left: 16px; padding-right: 16px; scroll-padding-left: 14px; margin-left: -16px; margin-right: -16px; }
  .hot-main-card { min-height: 300px; }
  .hot-main-body { padding: 20px; }
  .topic-item { gap: 12px; flex-wrap: nowrap; }
  .topic-info { min-width: 0; }
  .topic-name { white-space: normal; -webkit-line-clamp: 2; -webkit-box-orient: vertical; display: -webkit-box; overflow: hidden; }
  .scroll-down { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; padding-top: 48px; }
}
@media (max-width: 520px) {
  .hero h1.entry-title { font-size: 34px; }
  .hero-sub { font-size: 15px; }
  .hero-cta .btn { width: 100%; }
  .hero-meta { flex-direction: column; align-items: flex-start; gap: 6px; }
  .cta-banner { padding: 56px 0; }
  .cta-right .btn { width: 100%; }
  .brand-name { font-size: 16px; }
  .brand-badge { width: 32px; height: 32px; font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* roulang page: category1 */
:root{
  --bg:#0B0E0D;
  --surface-1:#111513;
  --surface-2:#171C19;
  --surface-3:#1C221E;
  --line:rgba(240,243,236,0.08);
  --line-strong:rgba(240,243,236,0.14);
  --accent:#C8F542;
  --accent-bright:#d6fc66;
  --accent-ink:#111803;
  --text:#F2F3EC;
  --text-sec:#A7AEA5;
  --text-muted:#6B746C;
  --red:#FF4B3A;
  --font: "PingFang SC","HarmonyOS Sans","MiSans","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --shadow:0 12px 32px rgba(0,0,0,0.18);
  --shadow-hover:0 18px 40px rgba(0,0,0,0.28);
  --transition:.3s cubic-bezier(.2,0,0,1);
  --header-h:74px;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;font-size:16px;}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  padding-top:var(--header-h);
  overflow-x:hidden;
}
body.menu-open{overflow:hidden;}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit;}
ul,ol{list-style:none;}
h1,h2,h3,h4,h5{font-weight:750;line-height:1.3;}
::selection{background:rgba(200,245,66,.28);color:var(--text);}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 24px;}
.section{padding:96px 0;}
.section-compact{padding:64px 0;}
.section-overline{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:13px;
  font-weight:600;
  letter-spacing:0.12em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:14px;
}
.section-overline::before{
  content:"";
  width:26px;height:2px;background:var(--accent);
  border-radius:2px;
}
.section-title{
  font-size:clamp(30px,4vw,42px);
  font-weight:800;
  letter-spacing:-0.01em;
  line-height:1.2;
  margin-bottom:14px;
}
.section-sub{
  color:var(--text-sec);
  max-width:720px;
  font-size:16px;
  line-height:1.8;
}
.text-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--accent);
  font-weight:600;
  font-size:15px;
  border-bottom:1px solid transparent;
  transition:border-color .25s,color .25s;
}
.text-link:hover{color:var(--accent-bright);border-color:rgba(200,245,66,.5);}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 28px;
  border-radius:var(--radius-sm);
  border:none;
  font-size:15px;
  font-weight:700;
  text-align:center;
  cursor:pointer;
  transition:transform .25s,background .25s,border-color .25s,color .25s,box-shadow .25s,opacity .25s;
  white-space:nowrap;
}
.btn-primary{
  background:var(--accent);
  color:var(--accent-ink);
}
.btn-primary:hover{
  background:var(--accent-bright);
  transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(200,245,66,.22);
}
.btn-primary:active{
  transform:translateY(0);
  box-shadow:none;
}
.btn-ghost{
  background:transparent;
  color:var(--text);
  border:1px solid rgba(242,243,236,.25);
}
.btn-ghost:hover{
  border-color:var(--accent);
  color:var(--accent);
  transform:translateY(-2px);
  background:rgba(200,245,66,.04);
}
.btn-nav{
  height:38px;
  padding:0 18px;
  font-size:14px;
}
.btn-lg{
  height:52px;
  padding:0 38px;
  font-size:16px;
}
.chip{
  display:inline-flex;
  align-items:center;
  height:28px;
  padding:0 14px;
  border-radius:999px;
  font-size:13px;
  font-weight:500;
  letter-spacing:.03em;
  border:1px solid rgba(240,243,236,.14);
  color:var(--text-sec);
  background:rgba(255,255,255,.02);
  white-space:nowrap;
}
.chip-accent{
  color:var(--accent);
  border-color:rgba(200,245,66,.35);
  background:rgba(200,245,66,.06);
}
.chip-soft{
  color:var(--text);
  border-color:rgba(240,243,236,.1);
  background:rgba(200,245,66,.08);
}
/* Header */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:200;
  height:var(--header-h);
  background:rgba(11,14,13,.72);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  border-bottom:1px solid transparent;
  transition:height .3s cubic-bezier(.2,0,0,1),background .3s,box-shadow .3s,border-color .3s;
}
.site-header.is-scrolled{
  height:64px;
  background:rgba(11,14,13,.92);
  border-bottom-color:var(--line);
  box-shadow:0 10px 30px rgba(0,0,0,.3);
}
.header-wrap{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:24px;
  height:100%;
  position:relative;
}
.nav-side{
  display:flex;
  align-items:center;
  min-width:0;
}
.nav-left{
  justify-content:flex-start;
}
.nav-right{
  justify-content:flex-end;
}
.nav-item{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:36px;
  padding:0 14px;
  font-size:15px;
  font-weight:500;
  color:var(--text-sec);
  border-radius:8px;
  position:relative;
  transition:color .25s,background .25s;
  white-space:nowrap;
}
.nav-item .dot{
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--accent);
  visibility:hidden;
}
.nav-item:hover{
  color:#fff;
  background:rgba(255,255,255,.03);
}
.nav-item::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:2px;
  width:0;
  height:2px;
  border-radius:2px;
  background:var(--accent);
  transform:translateX(-50%);
  transition:width .25s;
}
.nav-item:hover::after{
  width:18px;
}
.nav-item.active{
  color:#fff;
}
.nav-item.active .dot{
  visibility:visible;
}
.nav-item.active::after{
  width:18px;
}
.header-brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  color:#fff;
  user-select:none;
}
.brand-mark{
  width:34px;
  height:34px;
  border-radius:9px;
  background:var(--accent);
  color:var(--accent-ink);
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:18px;
  box-shadow:0 0 0 1px rgba(200,245,66,.4);
}
.brand-text{
  font-size:22px;
  font-weight:800;
  letter-spacing:.03em;
  line-height:1;
}
.header-login{
  display:inline-flex;
}
.header-burger{
  display:none;
  width:40px;
  height:40px;
  border-radius:10px;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(240,243,236,.12);
  cursor:pointer;
  transition:background .25s,border-color .25s;
}
.header-burger:hover{
  background:rgba(255,255,255,.1);
  border-color:rgba(200,245,66,.4);
}
.header-burger span{
  width:18px;
  height:2px;
  background:var(--text);
  border-radius:2px;
  transition:transform .3s,opacity .3s;
}
body.menu-open .header-burger span:nth-child(1){
  transform:translateY(7px) rotate(45deg);
}
body.menu-open .header-burger span:nth-child(2){
  opacity:0;
}
body.menu-open .header-burger span:nth-child(3){
  transform:translateY(-7px) rotate(-45deg);
}
.mobile-menu{
  display:none;
}
/* Breadcrumb */
.breadcrumb{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  color:var(--text-muted);
  padding:24px 0 0;
}
.breadcrumb a{
  color:var(--text-sec);
  transition:color .2s;
}
.breadcrumb a:hover{color:var(--accent);}
.breadcrumb .sep{opacity:.5;}
.breadcrumb .current{color:var(--text);}
/* Ledeb lock */
.lede-section{
  position:relative;
  padding:72px 0 88px;
  border-bottom:1px solid var(--line);
}
.lede-grid{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  align-items:center;
  gap:64px;
}
.lede-title{
  font-size:clamp(40px,6.5vw,76px);
  font-weight:800;
  line-height:1.05;
  letter-spacing:-0.02em;
  margin:8px 0 26px;
}
.lede-text{
  font-size:17px;
  color:var(--text-sec);
  max-width:620px;
  margin-bottom:36px;
}
.lede-actions{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:16px;
}
.lede-visual{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow);
  min-height:340px;
  max-height:520px;
}
.lede-visual img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .6s ease;
}
.lede-visual:hover img{
  transform:scale(1.03);
}
.lede-visual::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(11,14,13,0) 30%,rgba(11,14,13,.68) 100%);
  pointer-events:none;
}
.lede-visual .visual-caption{
  position:absolute;
  left:18px;
  right:18px;
  bottom:16px;
  z-index:2;
  font-size:14px;
  color:rgba(242,243,236,.86);
  letter-spacing:.05em;
  padding-left:2px;
}
/* Stats */
.stats-section{
  padding:0;
  background:var(--surface-1);
  border-bottom:1px solid var(--line);
}
.stats-row{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  border-left:1px solid var(--line);
}
.stat-item{
  padding:34px 30px;
  border-right:1px solid var(--line);
}
.stat-value{
  font-variant-numeric:tabular-nums;
  font-size:34px;
  font-weight:850;
  color:var(--accent);
  display:block;
  line-height:1.2;
}
.stat-label{
  margin-top:6px;
  font-size:14px;
  color:var(--text-sec);
}
/* Directory */
.directory-section{
  padding:96px 0;
}
.directory-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:32px;
  margin-bottom:60px;
}
.directory-list{
  border-top:1px solid var(--line);
}
.directory-row{
  display:grid;
  grid-template-columns:130px 1fr auto;
  gap:28px;
  padding:38px 8px;
  border-bottom:1px solid var(--line);
  border-radius:6px;
  position:relative;
  transition:background .3s,padding .3s,border-color .3s;
}
.directory-row:hover{
  background:rgba(255,255,255,.025);
  padding-left:22px;
  padding-right:22px;
  border-color:rgba(200,245,66,.16);
}
.directory-num{
  font-size:62px;
  font-weight:850;
  line-height:.9;
  color:rgba(242,243,236,.14);
  font-variant-numeric:tabular-nums;
  letter-spacing:-0.03em;
  transition:color .3s;
}
.directory-row:hover .directory-num{
  color:rgba(200,245,66,.72);
}
.directory-body h3{
  font-size:clamp(22px,2.6vw,30px);
  font-weight:750;
  letter-spacing:-0.01em;
  margin-bottom:10px;
}
.directory-body p{
  color:var(--text-sec);
  font-size:16px;
  line-height:1.8;
  max-width:780px;
}
.directory-tagline{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:16px;
}
.directory-side{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  justify-content:center;
  gap:12px;
  min-width:140px;
}
.directory-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--accent);
  font-size:14px;
  font-weight:600;
}
.directory-link svg{
  width:18px;
  height:18px;
  transition:transform .25s;
}
.directory-row:hover .directory-link svg{
  transform:translateX(4px);
}
/* Watch tips */
.tips-section{
  padding:96px 0;
  background:var(--surface-1);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.tips-card{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  background:var(--surface-2);
  border:1px solid var(--line);
  border-radius:20px;
  overflow:hidden;
  box-shadow:var(--shadow);
}
.tips-media{
  min-height:100%;
  position:relative;
}
.tips-media img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.tips-content{
  padding:44px 44px 40px;
}
.tips-content .section-title{
  font-size:clamp(24px,3vw,34px);
}
.tips-list{
  margin:24px 0 28px;
}
.tips-list li{
  display:flex;
  gap:12px;
  padding:11px 0;
  border-bottom:1px solid rgba(240,243,236,.06);
  color:var(--text-sec);
  font-size:15px;
}
.tips-list li:last-child{
  border-bottom:none;
}
.tips-list .tip-ic{
  flex:0 0 auto;
  width:22px;
  height:22px;
  border-radius:50%;
  background:rgba(200,245,66,.14);
  color:var(--accent);
  display:flex;
  align-items:center;
  justify-content:center;
  margin-top:5px;
}
.tips-list .tip-ic svg{
  width:12px;
  height:12px;
}
/* CTA */
.cta-band{
  position:relative;
  padding:110px 0;
  background:url('/assets/images/backpic/back-3.png') center/cover no-repeat;
}
.cta-band::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(100deg,rgba(11,14,13,.96) 10%,rgba(11,14,13,.84) 45%,rgba(11,14,13,.7) 100%);
}
.cta-band .container{
  position:relative;
  z-index:2;
}
.cta-inner{
  max-width:1100px;
  margin:0 auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:32px;
}
.cta-copy{
  max-width:640px;
}
.cta-title{
  font-size:clamp(30px,4.4vw,48px);
  font-weight:800;
  letter-spacing:-0.02em;
  line-height:1.2;
  margin-bottom:12px;
}
.cta-copy p{
  color:var(--text-sec);
  font-size:17px;
  margin-top:8px;
}
.cta-actions{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:16px;
}
/* Footer */
.site-footer{
  background:#090C0B;
  border-top:1px solid var(--line);
  padding:68px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:2.2fr 1.1fr 1.1fr 2fr;
  gap:36px;
  align-items:start;
}
.footer-grid>.cell{
  width:100% !important;
  flex:none !important;
  max-width:100% !important;
}
.footer-brand-col{
  padding-right:20px;
}
.footer-brand{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:18px;
}
.footer-brand-logo{
  width:34px;
  height:34px;
  border-radius:9px;
  background:var(--accent);
  color:var(--accent-ink);
  font-size:19px;
  font-weight:800;
  display:flex;
  align-items:center;
  justify-content:center;
}
.footer-brand-name{
  font-size:20px;
  font-weight:750;
  letter-spacing:.02em;
}
.footer-desc{
  color:var(--text-muted);
  font-size:14px;
  line-height:1.85;
  margin:10px 0;
}
.footer-col h4{
  font-size:14px;
  font-weight:650;
  color:#d4d9d1;
  margin-bottom:16px;
  letter-spacing:.06em;
}
.f-link{
  display:block;
  color:var(--text-muted);
  font-size:14px;
  line-height:1.4;
  margin-bottom:12px;
  transition:color .25s,padding-left .25s;
}
.f-link:hover{
  color:var(--accent);
  padding-left:4px;
}
.footer-bottom{
  margin-top:52px;
  border-top:1px solid var(--line);
  padding:22px 0 24px;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 20px;
  font-size:13px;
  color:var(--text-muted);
}
.footer-bottom-copy{
  letter-spacing:.02em;
}
/* visibility & responsive */
@media (min-width:1024px){
  .mobile-menu{
    display:none !important;
  }
}
@media (max-width:1023px){
  body{
    padding-top:64px;
  }
  .site-header,
  .site-header.is-scrolled{
    height:64px;
  }
  .header-wrap{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:10px;
  }
  .nav-side{
    display:none;
  }
  .header-brand{
    order:1;
  }
  .header-brand .brand-mark{
    width:32px;
    height:32px;
    font-size:17px;
  }
  .header-brand .brand-text{
    font-size:20px;
  }
  .header-login{
    order:2;
    margin-left:auto;
  }
  .header-burger{
    order:3;
    display:flex;
  }
  .mobile-menu{
    position:fixed;
    top:64px;
    left:0;
    right:0;
    z-index:300;
    display:block;
    background:linear-gradient(180deg,rgba(13,16,15,.98),rgba(11,14,13,.99));
    -webkit-backdrop-filter:blur(20px);
    backdrop-filter:blur(20px);
    border-bottom:1px solid var(--line);
    padding:16px 24px 28px;
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    transition:opacity .3s,transform .3s,visibility .3s;
    max-height:calc(100vh - 64px);
    overflow-y:auto;
  }
  body.menu-open .mobile-menu{
    visibility:visible;
    opacity:1;
    transform:translateY(0);
  }
  .mobile-nav{
    display:flex;
    flex-direction:column;
    gap:4px;
  }
  .mobile-nav-link{
    display:inline-flex;
    align-items:center;
    justify-content:space-between;
    padding:14px 6px;
    font-size:16px;
    font-weight:600;
    color:var(--text-sec);
    border-bottom:1px solid rgba(240,243,236,.06);
    transition:color .2s,padding-left .2s;
  }
  .mobile-nav-link.active{
    color:var(--accent);
  }
  .mobile-nav-link:hover{
    color:var(--accent);
    padding-left:12px;
  }
  .mobile-login{
    margin-top:22px;
    width:100%;
  }
  .section{
    padding:72px 0;
  }
  .directory-section,
  .tips-section{
    padding:72px 0;
  }
  .cta-band{
    padding:80px 0;
  }
  .lede-section{
    padding:52px 0 64px;
  }
  .lede-grid{
    grid-template-columns:1fr;
    gap:44px;
  }
  .lede-visual{
    min-height:320px;
    max-height:440px;
  }
  .stats-row{
    grid-template-columns:1fr 1fr 1fr;
  }
  .tips-card{
    grid-template-columns:1fr;
  }
  .tips-media{
    min-height:280px;
  }
  .footer-grid{
    grid-template-columns:1fr 1fr;
    gap:32px;
  }
}
@media (max-width:767px){
  body{
    padding-top:60px;
  }
  .site-header,
  .site-header.is-scrolled{
    height:60px;
  }
  .mobile-menu{
    top:60px;
    max-height:calc(100vh - 60px);
  }
  .header-login{
    display:none;
  }
  .header-brand{
    gap:7px;
  }
  .brand-text{
    font-size:18px;
  }
  .brand-mark{
    width:30px;
    height:30px;
    font-size:16px;
  }
  .container{
    padding:0 18px;
  }
  .section,
  .directory-section,
  .tips-section{
    padding:56px 0;
  }
  .breadcrumb{
    padding-top:18px;
  }
  .lede-section{
    padding:40px 0 56px;
  }
  .lede-title{
    margin-top:2px;
  }
  .lede-actions .btn{
    width:100%;
  }
  .lede-visual{
    min-height:230px;
  }
  .stats-row{
    grid-template-columns:1fr;
  }
  .stat-item{
    padding:22px 20px;
    border-bottom:1px solid var(--line);
  }
  .stat-item:last-child{
    border-bottom:none;
  }
  .directory-head{
    flex-direction:column;
    align-items:flex-start;
    gap:16px;
    margin-bottom:36px;
  }
  .directory-row{
    grid-template-columns:1fr;
    gap:8px;
    padding:24px 0;
  }
  .directory-row:hover{
    padding-left:14px;
    padding-right:8px;
  }
  .directory-num{
    font-size:42px;
    line-height:1;
  }
  .directory-side{
    flex-direction:row;
    justify-content:flex-start;
    align-items:center;
    min-width:0;
    margin-top:10px;
  }
  .tips-content{
    padding:28px 20px 30px;
  }
  .cta-inner{
    flex-direction:column;
    align-items:flex-start;
  }
  .cta-actions{
    width:100%;
  }
  .cta-actions .btn{
    width:100%;
  }
  .footer-grid{
    grid-template-columns:1fr;
    gap:30px;
  }
  .footer-brand-col{
    padding-right:0;
  }
  .footer-bottom{
    flex-direction:column;
  }
}
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* roulang page: article */
:root {
  --bg: #0B0E0D;
  --panel: #111513;
  --panel-2: #171C19;
  --panel-hover: #1C221E;
  --accent: #C8F542;
  --accent-hover: #D6FC66;
  --accent-ink: #111803;
  --text: #F2F3EC;
  --text-secondary: #A7AEA5;
  --text-muted: #6B746C;
  --border: rgba(240,243,236,0.08);
  --border-accent: rgba(200,245,66,0.28);
  --signal-red: #FF4B3A;
  --radius: 12px;
  --radius-banner: 16px;
  --radius-btn: 8px;
  --shadow-card: 0 12px 32px rgba(0,0,0,0.18);
  --shadow-hover: 0 18px 40px rgba(0,0,0,0.28);
  --font-stack: "PingFang SC", "HarmonyOS Sans", "MiSans", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --header-h: 72px;
  --ease: cubic-bezier(0.2, 0, 0, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.8;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

input, textarea {
  font-family: inherit;
}

.container {
  width: min(1280px, calc(100% - 40px));
  margin-inline: auto;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 46px;
  padding: 0 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  background: transparent;
  cursor: pointer;
  text-align: center;
  transition: transform 0.3s var(--ease), background 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(200,245,66,0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  border-color: rgba(242,243,236,0.25);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-lg {
  height: 54px;
  padding: 0 34px;
  font-size: 16px;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  height: var(--header-h);
  background: rgba(11, 14, 13, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition: height 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  height: 60px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  gap: 12px;
}

.nav-side {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.nav-left {
  justify-content: flex-start;
}

.nav-right-wrap {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
}

.nav-item {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 42px;
  padding: 0 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-item .dot {
  width: 4px;
  height: 4px;
  border-radius: 100%;
  background: var(--accent);
  margin-right: 7px;
  flex: 0 0 auto;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-item::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 3px;
  height: 2px;
  background: var(--accent);
  border-radius: 99px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease);
}

.nav-item:hover {
  color: var(--text);
}

.nav-item:hover::after,
.nav-item.active::after {
  transform: scaleX(1);
}

.nav-item.active {
  color: var(--text);
}

.nav-item.active .dot {
  opacity: 1;
  transform: scale(1);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: var(--header-h);
  transition: transform 0.3s var(--ease);
}

.site-logo:hover {
  transform: translateY(-1px);
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 22px;
  font-weight: 800;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(200, 245, 66, 0.18);
  line-height: 1;
}

.brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  white-space: nowrap;
  line-height: 1.1;
}

.brand-suffix {
  color: var(--text-secondary);
  font-weight: 700;
  margin-left: 1px;
}

.nav-cta {
  height: 38px;
  padding: 0 18px;
  font-size: 14px;
  border-radius: 8px;
}

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0 8px;
}

.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 99px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

body.menu-open .nav-burger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

body.menu-open .nav-burger span:nth-child(2) {
  opacity: 0;
}

body.menu-open .nav-burger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
  display: none;
}

/* ===== Article Stage ===== */
.article-stage {
  position: relative;
  isolation: isolate;
  padding: clamp(40px, 7vw, 84px) 0 56px;
  overflow: hidden;
}

.article-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
  opacity: 0.32;
  filter: saturate(0.9);
}

.article-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(11, 14, 13, 0.82) 0%, rgba(11, 14, 13, 0.45) 36%, rgba(11, 14, 13, 0.95) 100%);
}

.article-crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
  font-size: 14px;
  color: var(--text-muted);
}

.article-crumb a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.article-crumb a:hover {
  color: var(--accent);
}

.crumb-sep {
  opacity: 0.5;
}

.crumb-current {
  color: var(--text);
}

.article-head {
  width: min(960px, 100%);
}

.article-title {
  margin: 24px 0 0;
  max-width: 900px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--text);
  font-weight: 800;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: 28px;
  padding-bottom: 24px;
  font-size: 14px;
  color: var(--text-muted);
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid var(--border-accent);
  color: var(--accent);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  background: rgba(200, 245, 66, 0.06);
}

/* ===== Article Body ===== */
.article-body-section {
  padding: 12px 0 92px;
  position: relative;
}

.article-frame {
  width: min(860px, calc(100% - 40px));
  margin-inline: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-banner);
  padding: clamp(28px, 6vw, 58px);
  box-shadow: var(--shadow-card);
}

.article-rich {
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.95;
}

.article-rich > p:first-of-type {
  font-size: 19px;
  line-height: 1.85;
  color: var(--text);
  font-weight: 500;
}

.article-rich h2 {
  margin: 42px 0 18px;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1.4;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.article-rich h3 {
  margin: 34px 0 14px;
  font-size: 21px;
  line-height: 1.5;
  color: var(--text);
  font-weight: 700;
}

.article-rich p {
  margin: 0 0 24px;
}

.article-rich ul,
.article-rich ol {
  margin: 0 0 26px;
  padding-left: 1.25rem;
}

.article-rich li {
  margin: 8px 0;
}

.article-rich a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 245, 66, 0.3);
  transition: border-color 0.2s ease;
}

.article-rich a:hover {
  border-color: var(--accent);
}

.article-rich blockquote {
  margin: 32px 0;
  padding: 8px 24px;
  border-left: 2px solid var(--accent);
  color: var(--text-secondary);
  font-size: 15px;
  background: rgba(200, 245, 66, 0.03);
  border-radius: 0 10px 10px 0;
}

.article-rich img {
  border-radius: var(--radius-banner);
  margin: 32px 0;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.article-rich hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 44px 0;
}

.article-rich iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: var(--radius-banner);
}

.article-rich code,
.article-rich pre {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 14px;
}

.article-rich code {
  padding: 2px 6px;
}

.article-rich pre {
  padding: 20px;
  overflow-x: auto;
  line-height: 1.7;
  margin: 28px 0;
}

.article-rich pre code {
  padding: 0;
  background: transparent;
}

.article-rich table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  display: block;
  overflow-x: auto;
}

.article-rich th,
.article-rich td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
  font-size: 15px;
}

.article-rich th {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

/* ===== Article Toolbar ===== */
.article-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.tag-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.share-copy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.share-copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Not Found ===== */
.not-found-section {
  padding: clamp(70px, 10vw, 130px) 0;
}

.notfound-frame {
  width: min(680px, calc(100% - 40px));
  margin-inline: auto;
  text-align: center;
  padding: clamp(36px, 7vw, 72px);
  background: var(--panel);
  border: 1px dashed var(--border);
  border-radius: var(--radius-banner);
}

.nf-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 22px;
  background: rgba(200, 245, 66, 0.08);
  border: 1px solid var(--border-accent);
  color: var(--accent);
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 20px;
}

.notfound-frame h1 {
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 46px);
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.notfound-frame p {
  margin: 0 auto 26px;
  color: var(--text-secondary);
  max-width: 480px;
}

/* ===== Section Layout ===== */
.content-section {
  padding: 92px 0;
}

.overline {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.section-head {
  margin-bottom: 40px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  font-weight: 800;
}

/* ===== Recommendation Cards ===== */
.related-section {
  background: var(--panel);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.reco-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.reco-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow: var(--shadow-card);
}

.reco-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-hover);
}

.reco-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg);
}

.reco-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s var(--ease);
}

.reco-card:hover .reco-media img {
  transform: scale(1.04);
}

.reco-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 20px;
}

.reco-label {
  display: inline-flex;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.reco-body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 800;
  color: var(--text);
}

.reco-body p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.reco-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.2s ease, gap 0.2s ease;
}

.reco-card:hover .reco-link {
  color: var(--accent);
  gap: 12px;
}

/* ===== FAQ Section ===== */
.faq-section {
  padding: 92px 0;
}

.faq-title-wrap {
  margin-bottom: 32px;
}

.faq-list {
  width: min(920px, 100%);
  margin-inline: auto;
  border-top: 1px solid var(--border);
}

.faq-item {
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.faq-summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  padding: 24px 4px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: color 0.2s ease;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary:hover {
  color: var(--accent);
}

.faq-indicator {
  position: relative;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
}

.faq-indicator::before,
.faq-indicator::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 14px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: background 0.2s ease, transform 0.3s var(--ease);
}

.faq-indicator::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

details[open] .faq-indicator::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-answer {
  padding: 0 4px 26px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 760px;
}

.faq-answer p {
  margin: 0;
}

/* ===== CTA ===== */
.cta-section {
  padding: 24px 0 96px;
}

.cta-banner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  padding: clamp(30px, 5vw, 56px);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
}

.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, rgba(11, 14, 13, 0.92), rgba(11, 14, 13, 0.55));
}

.cta-copy,
.cta-banner .btn {
  position: relative;
  z-index: 1;
}

.cta-copy h2 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
  font-weight: 800;
}

.cta-copy p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}

/* ===== Footer ===== */
.site-footer {
  background: #080B09;
  border-top: 1px solid var(--border);
  padding: 72px 0 24px;
}

.footer-grid {
  row-gap: 44px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-brand-logo {
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 10px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
}

.footer-brand-name {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.01em;
}

.footer-desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h4 {
  margin: 0 0 10px;
  font-size: 15px;
  color: var(--text);
  font-weight: 700;
}

.f-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  width: fit-content;
}

.f-link:hover {
  color: var(--accent);
  transform: translateX(2px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 52px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-secondary);
}

.footer-bottom a:hover {
  color: var(--accent);
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
}

.reveal.in-view {
  animation: fadeUp 0.7s var(--ease) forwards;
}

@keyframes pulseDot {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

/* ===== Responsive ===== */
@media (min-width: 1024px) {
  .header-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
  }
  .nav-left {
    justify-content: flex-start;
  }
  .nav-right-wrap {
    display: flex;
    justify-content: flex-end;
  }
}

@media (max-width: 1180px) {
  .nav-cta {
    display: none;
  }
}

@media (max-width: 767px) {
  .container {
    width: min(100% - 32px, 1280px);
  }

  .header-inner {
    display: flex;
  }

  .nav-left,
  .nav-right,
  .nav-right-wrap {
    display: none;
  }

  .site-logo {
    flex: 1;
    justify-content: flex-start;
  }

  .brand-suffix {
    display: inline;
  }

  .nav-burger {
    display: flex;
  }

  .mobile-menu {
    display: block;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(8, 11, 9, 0.98);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    padding: 12px 16px 22px;
    border-bottom: 1px solid var(--border);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.3s ease, transform 0.3s var(--ease), visibility 0.3s;
  }

  body.menu-open .mobile-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .m-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 11px 12px;
    border-radius: 10px;
    transition: background 0.2s ease, color 0.2s ease;
  }

  .m-nav-item:active {
    background: rgba(255,255,255,0.04);
    color: var(--text);
  }

  .mobile-nav-sep {
    margin: 6px 12px;
    height: 1px;
    background: var(--border);
  }

  .m-nav-item.mobile-cta {
    display: inline-flex;
    margin-top: 14px;
    background: var(--accent);
    color: var(--accent-ink);
    height: 46px;
    justify-content: center;
    font-weight: 700;
    border-radius: 8px;
  }

  .article-stage {
    padding-top: 44px;
  }

  .article-crumb {
    font-size: 13px;
    margin-bottom: 22px;
  }

  .article-title {
    margin-top: 18px;
  }

  .article-meta {
    gap: 8px 14px;
    font-size: 13px;
    margin-top: 20px;
  }

  .article-frame {
    width: calc(100% - 24px);
    padding: 20px 16px 28px;
  }

  .article-rich {
    font-size: 16px;
  }

  .article-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .share-copy {
    width: 100%;
    justify-content: center;
  }

  .content-section,
  .faq-section {
    padding: 56px 0;
  }

  .section-head {
    margin-bottom: 28px;
  }

  .reco-grid {
    grid-template-columns: 1fr;
  }

  .faq-section {
    padding-top: 56px;
  }

  .faq-summary {
    font-size: 16px;
    padding: 18px 0;
  }

  .cta-section {
    padding: 16px 0 56px;
  }

  .cta-banner {
    padding: 28px 22px;
  }

  .cta-banner .btn {
    width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
    margin-top: 32px;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .nav-item {
    font-size: 14px;
    padding: 0 7px;
  }

  .brand-suffix {
    display: none;
  }

  .nav-cta {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
  .reveal {
    opacity: 1;
  }
}

/* roulang page: category2 */
:root {
        --bg: #0B0E0D;
        --panel: #111513;
        --surface: #171C19;
        --surface-up: #1C221E;
        --accent: #C8F542;
        --accent-dark: #111803;
        --text: #F2F3EC;
        --text-secondary: #A7AEA5;
        --text-muted: #6B746C;
        --line: rgba(240, 243, 236, 0.08);
        --line-strong: rgba(240, 243, 236, 0.16);
        --danger: #FF4B3A;
        --radius: 12px;
        --btn-radius: 8px;
        --shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
        --shadow-hover: 0 18px 40px rgba(0, 0, 0, 0.28);
        --transition: 0.3s cubic-bezier(0.2, 0, 0, 1);
    }

    *,
    *::before,
    *::after {
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        margin: 0;
        background: var(--bg);
        color: var(--text);
        font-family: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", system-ui, sans-serif;
        font-size: 16px;
        line-height: 1.8;
        -webkit-font-smoothing: antialiased;
        text-rendering: optimizeLegibility;
    }

    img,
    svg,
    video {
        display: block;
        max-width: 100%;
    }

    a {
        color: inherit;
        text-decoration: none;
    }

    button,
    input,
    textarea,
    select {
        font: inherit;
    }

    h1,
    h2,
    h3,
    h4,
    p,
    ul,
    ol,
    figure {
        margin: 0;
    }

    ul,
    ol {
        list-style: none;
    }

    :focus-visible {
        outline: 3px solid rgba(200, 245, 66, 0.45);
        outline-offset: 3px;
        border-radius: 4px;
    }

    .container {
        width: min(1280px, 100% - 48px);
        margin-inline: auto;
    }

    .skip-link {
        position: fixed;
        top: -40px;
        left: 16px;
        z-index: 10000;
        background: var(--accent);
        color: var(--accent-dark);
        padding: 8px 14px;
        border-radius: 0 0 8px 8px;
        transition: top 0.2s ease;
        font-weight: 600;
    }

    .skip-link:focus {
        top: 0;
    }

    .overline {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        font-size: 13px;
        font-weight: 600;
        letter-spacing: 0.2em;
        color: var(--accent);
        text-transform: uppercase;
        margin-bottom: 14px;
    }

    .overline::before {
        content: "";
        width: 22px;
        height: 2px;
        background: var(--accent);
        flex: 0 0 auto;
    }

    .section {
        padding-block: 80px;
    }

    .section-head {
        max-width: 760px;
        margin-bottom: 48px;
    }

    .section-head h2 {
        font-size: clamp(30px, 4vw, 44px);
        line-height: 1.15;
        font-weight: 750;
        letter-spacing: -0.02em;
    }

    .section-head p {
        color: var(--text-secondary);
        font-size: 17px;
        margin-top: 18px;
        line-height: 1.8;
    }

    .section-index {
        font-size: 13px;
        font-weight: 600;
        color: var(--text-muted);
        display: block;
        letter-spacing: 0.16em;
        margin-bottom: 6px;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        height: 46px;
        padding-inline: 28px;
        border-radius: var(--btn-radius);
        font-size: 15px;
        font-weight: 700;
        border: 1px solid transparent;
        transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border 0.2s ease, color 0.2s ease;
        cursor: pointer;
        white-space: nowrap;
    }

    .btn-primary {
        background: var(--accent);
        color: var(--accent-dark);
    }

    .btn-primary:hover {
        background: #d6fc66;
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(200, 245, 66, 0.2);
    }

    .btn-primary:active {
        transform: translateY(0);
        box-shadow: none;
    }

    .btn-secondary {
        background: transparent;
        border-color: rgba(242, 243, 236, 0.3);
        color: var(--text);
    }

    .btn-secondary:hover {
        border-color: var(--accent);
        color: var(--accent);
        transform: translateY(-2px);
    }

    .btn-sm {
        height: 38px;
        padding-inline: 18px;
        font-size: 14px;
        border-radius: 7px;
    }

    .text-arrow {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
        font-weight: 600;
        color: var(--accent);
        transition: gap 0.2s ease, opacity 0.2s ease;
    }

    .text-arrow:hover {
        gap: 12px;
        opacity: 0.85;
    }

    .hero-section {
        position: relative;
        min-height: 580px;
        display: flex;
        align-items: center;
        overflow: hidden;
        padding-block: calc(96px + 72px) 72px;
    }

    .hero-bg {
        position: absolute;
        inset: 0;
        background-image: url("/assets/images/backpic/back-2.webp");
        background-size: cover;
        background-position: center;
        z-index: 0;
        transform: scale(1.02);
        animation: hero-bg 18s ease-in-out infinite alternate;
    }

    @keyframes hero-bg {
        from {
            transform: scale(1.02);
        }
        to {
            transform: scale(1.08);
        }
    }

    .hero-bg::after {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(90deg, #0B0E0D 0%, rgba(11, 14, 13, 0.72) 48%, rgba(11, 14, 13, 0.35) 100%),
            linear-gradient(0deg, rgba(11, 14, 13, 0.96) 0%, rgba(11, 14, 13, 0.55) 60%, rgba(11, 14, 13, 0.15) 100%);
    }

    .hero-content {
        position: relative;
        z-index: 1;
        max-width: 720px;
    }

    .hero-kicker {
        margin-bottom: 18px;
    }

    .hero-title {
        font-size: clamp(48px, 7.5vw, 92px);
        line-height: 1.02;
        font-weight: 800;
        letter-spacing: -0.03em;
        margin-bottom: 22px;
        color: var(--text);
    }

    .hero-title .title-line {
        display: block;
        color: var(--accent);
    }

    .hero-lead {
        font-size: clamp(18px, 2.2vw, 24px);
        line-height: 1.55;
        color: var(--text-secondary);
        max-width: 620px;
        margin-bottom: 34px;
    }

    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 14px;
        margin-bottom: 30px;
    }

    .hero-meta {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
    }

    .hero-meta-item {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
        color: var(--text-secondary);
        background: rgba(17, 21, 19, 0.72);
        border: 1px solid var(--line);
        padding: 7px 13px;
        border-radius: 999px;
        backdrop-filter: blur(10px);
    }

    .hero-meta-item i {
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--accent);
        flex: 0 0 auto;
    }

    .hero-meta-item small {
        font-size: 13px;
    }

    .hero-scroll {
        position: absolute;
        right: 20px;
        bottom: 24px;
        z-index: 2;
        width: 26px;
        height: 38px;
        border: 1px solid var(--line-strong);
        border-radius: 100px;
        display: flex;
        align-items: flex-start;
        justify-content: center;
        padding: 8px 0;
        opacity: 0.8;
    }

    .hero-scroll::after {
        content: "";
        width: 3px;
        height: 8px;
        border-radius: 2px;
        background: var(--accent);
        animation: scroll-dot 1.8s ease-in-out infinite;
    }

    @keyframes scroll-dot {
        0% {
            transform: translateY(0);
            opacity: 1;
        }
        60% {
            transform: translateY(14px);
            opacity: 0;
        }
        100% {
            transform: translateY(0);
            opacity: 0;
        }
    }

    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 72px;
        z-index: 1000;
        background: rgba(11, 14, 13, 0.5);
        border-bottom: 1px solid transparent;
        backdrop-filter: blur(14px);
        transition: height 0.3s ease, background 0.3s ease, border-color 0.3s ease;
    }

    .site-header.scrolled {
        height: 60px;
        background: rgba(11, 14, 13, 0.86);
        border-bottom-color: var(--line);
        backdrop-filter: blur(18px);
    }

    .header-inner {
        height: 100%;
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        align-items: center;
    }

    .nav-side {
        display: flex;
        align-items: center;
        gap: 6px;
        min-width: 0;
    }

    .nav-left {
        justify-content: flex-start;
        gap: 2px;
    }

    .nav-right {
        justify-content: flex-end;
        gap: 10px;
    }

    .nav-item {
        padding: 8px 11px;
        font-size: 15px;
        font-weight: 500;
        color: var(--text-secondary);
        border-radius: 7px;
        position: relative;
        display: inline-flex;
        align-items: center;
        gap: 6px;
        transition: color 0.2s ease, background 0.2s ease;
    }

    .nav-item i.dot {
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: transparent;
        transition: background 0.2s ease;
    }

    .nav-item .nav-label {
        position: relative;
    }

    .nav-item .nav-label::after {
        content: "";
        position: absolute;
        left: 0;
        bottom: -7px;
        height: 2px;
        width: 0%;
        background: var(--accent);
        transition: width 0.22s cubic-bezier(0.2, 0, 0, 1);
    }

    .nav-item:hover {
        color: var(--text);
    }

    .nav-item:hover .nav-label::after {
        width: 100%;
    }

    .nav-item.active {
        color: #fff;
    }

    .nav-item.active i.dot {
        background: var(--accent);
    }

    .nav-item.active .nav-label::after {
        width: 100%;
    }

    .nav-divider {
        width: 1px;
        height: 20px;
        background: var(--line-strong);
        margin-inline: 6px;
    }

    .brand-logo {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 9px;
        line-height: 1;
    }

    .brand-logo .logo-mark {
        width: 34px;
        height: 34px;
        background: var(--accent);
        color: var(--accent-dark);
        border-radius: 9px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 800;
        font-size: 18px;
        flex: 0 0 auto;
        letter-spacing: -0.02em;
    }

    .brand-logo .logo-name {
        font-size: 19px;
        font-weight: 750;
        letter-spacing: -0.01em;
        white-space: nowrap;
    }

    .nav-toggle {
        display: none;
    }

    .nav-drawer {
        display: none;
    }

    .nav-backdrop {
        display: none;
    }

    .chip-group {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 20px;
    }

    .chip {
        font-size: 13px;
        line-height: 1.5;
        padding: 5px 13px;
        border: 1px solid var(--line-strong);
        color: var(--text-secondary);
        border-radius: 999px;
        transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
    }

    .chip:hover {
        border-color: var(--accent);
        color: var(--accent);
        background: rgba(200, 245, 66, 0.04);
    }

    .intro-section {
        padding-top: 96px;
    }

    .intro-grid {
        display: grid;
        grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
        gap: clamp(28px, 5vw, 96px);
        align-items: start;
    }

    .intro-copy h2 {
        font-size: clamp(28px, 4vw, 44px);
        font-weight: 750;
        line-height: 1.2;
        letter-spacing: -0.02em;
        margin-bottom: 20px;
    }

    .intro-copy p {
        color: var(--text-secondary);
        font-size: 17px;
        line-height: 1.9;
        margin-bottom: 20px;
    }

    .intro-card {
        background: var(--surface);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        padding: 30px;
        box-shadow: var(--shadow);
    }

    .intro-card-list {
        display: grid;
        gap: 20px;
    }

    .intro-card-list li {
        display: flex;
        gap: 14px;
        align-items: flex-start;
    }

    .intro-icon {
        width: 42px;
        height: 42px;
        flex: 0 0 auto;
        background: rgba(200, 245, 66, 0.1);
        border: 1px solid rgba(200, 245, 66, 0.2);
        border-radius: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--accent);
        font-weight: 700;
    }

    .intro-card-list h3 {
        font-size: 16px;
        font-weight: 650;
        margin-bottom: 3px;
    }

    .intro-card-list p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.7;
        margin: 0;
    }

    .feature-block {
        padding-top: 20px;
    }

    .feature-row {
        display: grid;
        grid-template-columns: minmax(0, 47%) minmax(0, 53%);
        align-items: center;
        gap: clamp(32px, 6vw, 96px);
        padding-block: 76px;
        position: relative;
    }

    .feature-row + .feature-row {
        border-top: 1px solid var(--line);
    }

    .feature-row--reverse .feature-media {
        order: 2;
    }

    .feature-media {
        order: 1;
        position: relative;
        border-radius: 16px;
        overflow: hidden;
        box-shadow: var(--shadow);
        background: var(--surface);
    }

    .feature-media::after {
        content: "";
        display: block;
        padding-top: 66%;
    }

    .feature-media img {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s cubic-bezier(0.2, 0, 0, 1);
    }

    .feature-row:hover .feature-media img {
        transform: scale(1.03);
    }

    .feature-media .feature-tag {
        position: absolute;
        top: 14px;
        left: 14px;
        z-index: 2;
        background: rgba(11, 14, 13, 0.78);
        color: var(--accent);
        border: 1px solid rgba(200, 245, 66, 0.24);
        font-size: 13px;
        padding: 6px 12px;
        border-radius: 999px;
        backdrop-filter: blur(6px);
    }

    .feature-number {
        display: inline-flex;
        font-size: 14px;
        font-weight: 700;
        color: var(--accent);
        margin-bottom: 14px;
        letter-spacing: 0.1em;
    }

    .feature-content h2 {
        font-size: clamp(26px, 3.3vw, 38px);
        line-height: 1.22;
        font-weight: 750;
        letter-spacing: -0.02em;
        margin-bottom: 14px;
    }

    .feature-content > p {
        color: var(--text-secondary);
        font-size: 16px;
        line-height: 1.9;
        margin-bottom: 16px;
        max-width: 580px;
    }

    .feature-points {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin: 18px 0 26px;
    }

    .feature-points li {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        color: var(--text-secondary);
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid var(--line);
        padding: 6px 12px;
        border-radius: 999px;
    }

    .feature-points li::before {
        content: "";
        width: 6px;
        height: 6px;
        border-radius: 2px;
        background: var(--accent);
        flex: 0 0 auto;
    }

    .feature-links {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 24px;
    }

    .feature-links .link-muted {
        font-size: 14px;
        color: var(--text-muted);
        transition: color 0.2s ease;
    }

    .feature-links .link-muted:hover {
        color: var(--text);
    }

    .sync-panel {
        margin-top: 40px;
        background: var(--panel);
        border: 1px solid var(--line);
        border-radius: 18px;
        overflow: hidden;
        display: grid;
        grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
        box-shadow: var(--shadow);
    }

    .sync-panel-media {
        position: relative;
        min-height: 290px;
        overflow: hidden;
        background-image: url("/assets/images/backpic/back-3.png");
        background-size: cover;
        background-position: center;
    }

    .sync-panel-media::after {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(90deg, rgba(11, 14, 13, 0.1), rgba(11, 14, 13, 0.82));
    }

    .sync-panel-content {
        padding: clamp(24px, 4vw, 54px);
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .sync-panel-content h2 {
        font-size: clamp(24px, 3vw, 34px);
        font-weight: 750;
        line-height: 1.3;
        letter-spacing: -0.02em;
        margin-bottom: 14px;
    }

    .sync-panel-content p {
        color: var(--text-secondary);
        font-size: 16px;
        line-height: 1.8;
        margin-bottom: 12px;
    }

    .sync-stats {
        display: flex;
        flex-wrap: wrap;
        gap: 14px;
        margin: 20px 0 26px;
    }

    .sync-stats span {
        display: inline-flex;
        gap: 6px;
        align-items: center;
        font-size: 14px;
        color: var(--text-secondary);
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid var(--line);
        padding: 8px 14px;
        border-radius: 8px;
    }

    .sync-stats strong {
        color: var(--accent);
        font-variant-numeric: tabular-nums;
    }

    .steps-section {
        padding-bottom: 40px;
    }

    .steps-list {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
        margin-top: 40px;
    }

    .step-card {
        position: relative;
        background: var(--surface);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        padding: 30px 26px 26px;
        transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
    }

    .step-card:hover {
        transform: translateY(-4px);
        border-color: rgba(200, 245, 66, 0.32);
        box-shadow: var(--shadow-hover);
    }

    .step-number {
        width: 40px;
        height: 40px;
        border-radius: 10px;
        background: var(--accent);
        color: var(--accent-dark);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 800;
        font-variant-numeric: tabular-nums;
        margin-bottom: 20px;
    }

    .step-card h3 {
        font-size: 18px;
        font-weight: 700;
        margin-bottom: 8px;
    }

    .step-card p {
        color: var(--text-secondary);
        font-size: 14px;
        line-height: 1.75;
    }

    .faq-section {
        padding-block: 80px;
    }

    .faq-layout {
        display: grid;
        grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
        gap: clamp(32px, 6vw, 100px);
        align-items: start;
    }

    .faq-intro h2 {
        font-size: clamp(30px, 4vw, 44px);
        line-height: 1.2;
        font-weight: 750;
        letter-spacing: -0.02em;
        margin-bottom: 16px;
    }

    .faq-intro p {
        color: var(--text-secondary);
        font-size: 16px;
        line-height: 1.85;
    }

    .faq-intro .faq-contact {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        margin-top: 28px;
        color: var(--accent);
        font-weight: 600;
        font-size: 15px;
    }

    .accordion-list {
        background: transparent;
        border-top: 1px solid var(--line);
    }

    .accordion-item {
        background: transparent;
        border-bottom: 1px solid var(--line);
    }

    .accordion-title {
        width: 100%;
        display: flex;
        align-items: center;
        color: var(--text);
        font-size: 16px;
        font-weight: 600;
        padding: 22px 40px 22px 2px;
        line-height: 1.5;
        position: relative;
        transition: color 0.2s ease;
    }

    .accordion-title:hover {
        color: var(--accent);
    }

    .accordion-title::after {
        content: "";
        border: none;
        position: absolute;
        right: 2px;
        top: 28px;
        width: 15px;
        height: 2px;
        background: var(--text-secondary);
        box-shadow: none;
        transform: none;
        margin: 0;
        transition: background 0.2s ease;
    }

    .accordion-title::before {
        content: "";
        position: absolute;
        right: 9px;
        top: 22px;
        width: 2px;
        height: 15px;
        background: var(--text-secondary);
        transition: background 0.2s ease, transform 0.3s ease;
    }

    .accordion-title[aria-expanded="true"]::before {
        transform: rotate(90deg);
        background: var(--accent);
    }

    .accordion-title[aria-expanded="true"]::after {
        background: var(--accent);
    }

    .accordion-content {
        background: transparent;
        padding: 0 40px 22px 2px;
        color: var(--text-secondary);
        font-size: 15px;
        line-height: 1.8;
    }

    .cta-section {
        position: relative;
        padding-block: 120px;
        background-image: url("/assets/images/backpic/back-1.webp");
        background-size: cover;
        background-attachment: fixed;
        background-position: center;
        overflow: hidden;
    }

    .cta-section::before {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(270deg, rgba(11, 14, 13, 0.56), rgba(11, 14, 13, 0.96)),
            linear-gradient(0deg, rgba(11, 14, 13, 0.1), rgba(11, 14, 13, 0.74));
    }

    .cta-inner {
        position: relative;
        z-index: 1;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 40px;
    }

    .cta-copy h2 {
        font-size: clamp(32px, 5vw, 56px);
        line-height: 1.12;
        font-weight: 800;
        letter-spacing: -0.02em;
        max-width: 680px;
    }

    .cta-copy h2 span {
        color: var(--accent);
    }

    .cta-copy p {
        color: var(--text-secondary);
        max-width: 600px;
        margin-top: 16px;
        font-size: 16px;
        line-height: 1.8;
    }

    .cta-inner .btn {
        flex: 0 0 auto;
    }

    .site-footer {
        background: #070A09;
        border-top: 1px solid var(--line);
        padding-top: 72px;
        margin-top: 0;
    }

    .footer-grid {
        row-gap: 32px;
    }

    .footer-brand-col {
        margin-bottom: 10px;
    }

    .footer-brand {
        display: flex;
        align-items: center;
        gap: 12px;
        margin-bottom: 18px;
    }

    .footer-brand-logo {
        width: 38px;
        height: 38px;
        background: var(--accent);
        border-radius: 10px;
        color: var(--accent-dark);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 800;
        font-size: 18px;
    }

    .footer-brand-name {
        font-size: 20px;
        font-weight: 750;
    }

    .footer-desc {
        color: var(--text-secondary);
        font-size: 14px;
        line-height: 1.85;
        max-width: 340px;
    }

    .footer-col h4 {
        color: var(--text);
        font-size: 15px;
        font-weight: 650;
        margin-bottom: 16px;
    }

    .footer-col a {
        display: block;
        padding: 6px 0;
        color: var(--text-secondary);
        font-size: 14px;
        transition: color 0.2s ease, padding-left 0.2s ease;
    }

    .footer-col a:hover {
        color: var(--accent);
        padding-left: 4px;
    }

    .footer-bottom {
        margin-top: 56px;
        border-top: 1px solid var(--line);
        padding-block: 20px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        color: var(--text-muted);
        font-size: 13px;
        flex-wrap: wrap;
    }

    .to-top {
        position: fixed;
        right: 18px;
        bottom: 20px;
        width: 44px;
        height: 44px;
        border-radius: 50%;
        z-index: 900;
        background: rgba(255, 255, 255, 0.06);
        border: 1px solid var(--line-strong);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-secondary);
        transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
    }

    .to-top:hover {
        color: var(--accent-dark);
        background: var(--accent);
        transform: translateY(-3px);
    }

    .rev-init {
        opacity: 0;
        transform: translateY(16px);
    }

    .rev-in {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.7s cubic-bezier(0.2, 0, 0, 1), transform 0.7s cubic-bezier(0.2, 0, 0, 1);
    }

    @media (max-width: 1023px) {
        .section {
            padding-block: 60px;
        }

        .nav-side {
            display: none;
        }

        .header-inner {
            grid-template-columns: 1fr auto 1fr;
        }

        .nav-toggle {
            display: inline-flex;
            justify-self: end;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            border: 0;
            background: transparent;
            border-radius: 8px;
            cursor: pointer;
            z-index: 1102;
            position: relative;
        }

        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

        .nav-open .nav-toggle span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-open .nav-toggle span:nth-child(2) {
            opacity: 0;
        }

        .nav-open .nav-toggle span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .nav-drawer {
            display: block;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1100;
            background: rgba(11, 14, 13, 0.96);
            backdrop-filter: blur(24px);
            border-bottom: 1px solid var(--line);
            transform: translateY(-110%);
            transition: transform 0.35s cubic-bezier(0.2, 0, 0, 1);
            padding: 92px 20px 28px;
        }

        .nav-open .nav-drawer {
            transform: translateY(0);
        }

        .nav-drawer-inner {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 14px;
            max-width: 680px;
            margin: 0 auto;
        }

        .drawer-link {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 16px 18px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--line);
            border-radius: 10px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            transition: border-color 0.2s ease, background 0.2s ease;
        }

        .drawer-link:hover {
            border-color: var(--accent);
            background: rgba(200, 245, 66, 0.06);
        }

        .drawer-link.active {
            border-color: rgba(200, 245, 66, 0.45);
            color: var(--accent);
        }

        .nav-backdrop {
            position: fixed;
            inset: 0;
            z-index: 1050;
            background: rgba(0, 0, 0, 0.55);
            display: block;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }

        .nav-open .nav-backdrop {
            opacity: 1;
            visibility: visible;
        }

        .intro-grid,
        .sync-panel,
        .faq-layout {
            grid-template-columns: 1fr;
        }

        .steps-list {
            grid-template-columns: repeat(2, 1fr);
        }

        .cta-inner {
            flex-direction: column;
            align-items: flex-start;
        }
    }

    @media (max-width: 767px) {
        body {
            font-size: 15px;
        }

        .container {
            width: min(100% - 32px, 1280px);
        }

        .section {
            padding-block: 48px;
        }

        .hero-section {
            min-height: 560px;
            padding-block: 88px 64px;
        }

        .hero-lead {
            margin-bottom: 20px;
        }

        .hero-actions {
            flex-direction: column;
            align-items: stretch;
        }

        .hero-actions .btn {
            width: 100%;
        }

        .hero-meta {
            gap: 8px;
        }

        .hero-meta-item {
            padding: 6px 10px;
            font-size: 12px;
        }

        .hero-scroll {
            display: none;
        }

        .feature-row {
            grid-template-columns: 1fr;
            padding-block: 44px;
            gap: 22px;
        }

        .feature-row--reverse .feature-media {
            order: 1;
        }

        .feature-content {
            order: 2;
        }

        .steps-list {
            grid-template-columns: 1fr;
            gap: 16px;
        }

        .faq-section {
            padding-block: 56px;
        }

        .cta-section {
            padding-block: 80px;
        }

        .cta-inner {
            gap: 30px;
        }

        .cta-inner .btn {
            width: 100%;
        }

        .sync-panel-media {
            min-height: 210px;
        }

        .feature-links {
            gap: 18px;
        }

        .footer-bottom {
            flex-direction: column;
            align-items: flex-start;
        }
    }

    @media (max-width: 520px) {
        .nav-drawer-inner {
            grid-template-columns: 1fr;
        }

        .section-head {
            margin-bottom: 28px;
        }

        .section-head p {
            font-size: 15px;
        }

        .feature-points {
            align-items: flex-start;
        }

        .accordion-title {
            font-size: 15px;
            padding-right: 34px;
            white-space: normal;
        }

        .accordion-content {
            padding-right: 0;
            font-size: 14px;
        }
    }

    @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
            animation-duration: 0.01ms !important;
            transition-duration: 0.01ms !important;
            scroll-behavior: auto !important;
        }

        .rev-init {
            opacity: 1;
            transform: none;
        }
    }

/* roulang page: category3 */
:root{
  --page-bg:#0B0E0D;
  --panel-bg:#111513;
  --card-bg:#171C19;
  --card-hover:#1C221E;
  --accent:#C8F542;
  --accent-ink:#111803;
  --text-main:#F2F3EC;
  --text-sub:#A7AEA5;
  --text-muted:#6B746C;
  --line:rgba(240,243,236,0.08);
  --line-strong:rgba(240,243,236,0.14);
  --danger:#FF4B3A;
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 12px 32px rgba(0,0,0,0.18);
  --shadow-up:0 18px 40px rgba(0,0,0,0.28);
  --ease:cubic-bezier(0.2,0,0,1);
  --font-stack:"PingFang SC","HarmonyOS Sans","MiSans","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--page-bg);
  color:var(--text-main);
  font-family:var(--font-stack);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none;transition:color .2s ease,border-color .2s ease,opacity .2s ease}
button,input,select,textarea{font:inherit;font-variant-numeric:tabular-nums}
ul,ol{margin:0;padding:0;list-style:none}
.container{max-width:1320px;margin:0 auto;padding:0 24px;width:100%}
.grid-x,.grid-margin-x{display:flex;flex-wrap:wrap}
::selection{background:var(--accent);color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

/* header */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:72px;background:rgba(11,14,13,.78);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
  transition:height .3s var(--ease),background .3s ease,border-color .3s ease;
}
.site-header.scrolled{height:60px;background:rgba(11,14,13,.92);border-bottom-color:rgba(240,243,236,.06)}
.header-grid{height:100%;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px}
.header-col{min-width:0;display:flex;align-items:center}
.header-col.left{justify-content:flex-start;gap:4px}
.header-col.right{justify-content:flex-end;gap:4px}
.nav-side{display:flex;align-items:center;gap:2px}
.nav-item{
  display:inline-flex;align-items:center;gap:6px;
  position:relative;padding:8px 14px;font-size:15px;font-weight:500;
  color:var(--text-sub);white-space:nowrap;
}
.nav-item .dot{width:4px;height:4px;border-radius:50%;background:transparent;transition:background .2s ease}
.nav-item::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:center;
  transition:transform .25s var(--ease);
}
.nav-item:hover{color:#fff}
.nav-item:hover::after{transform:scaleX(1)}
.nav-item.active{color:#fff}
.nav-item.active::after{transform:scaleX(1)}
.nav-item.active .dot{background:var(--accent);box-shadow:0 0 8px rgba(200,245,66,.4)}
.site-brand{
  display:flex;align-items:center;gap:9px;color:var(--text-main);
  letter-spacing:-.01em;
}
.brand-mark{
  width:38px;height:38px;display:flex;align-items:center;justify-content:center;
  background:var(--accent);color:var(--accent-ink);font-weight:800;font-size:18px;
  border-radius:8px;flex:0 0 auto;
}
.brand-name{display:flex;flex-direction:column;line-height:1.1;font-weight:700;text-align:left}
.brand-name strong{font-size:17px;letter-spacing:.01em}
.brand-name span{font-size:11px;font-weight:500;color:var(--text-sub);letter-spacing:.12em}
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 28px;border-radius:var(--radius-sm);border:0;
  font-size:15px;font-weight:700;cursor:pointer;
  transition:transform .25s var(--ease),background .25s ease,color .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:#d6fc66;transform:translateY(-2px);box-shadow:0 8px 24px rgba(200,245,66,.2)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{
  background:transparent;border:1px solid rgba(242,243,236,.25);color:var(--text-main);
}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);background:rgba(200,245,66,.04)}
.btn-outline:active{transform:translateY(0)}
.nav-login-btn{height:38px;padding:0 20px;margin-left:10px}
.nav-toggle,.mobile-topbar{display:none}
@media (max-width:1199px){
  .nav-item{padding:7px 8px;font-size:14px}
  .nav-item::after{left:8px;right:8px}
  .nav-login-btn{margin-left:4px;padding:0 14px}
}
@media (max-width:1023px){
  .header-grid{grid-template-columns:1fr auto}
  .nav-side{display:none}
  .site-brand{grid-column:1;grid-row:1}
  .mobile-topbar{display:flex;align-items:center;justify-content:flex-end;gap:8px;grid-column:2;grid-row:1}
  .nav-toggle{
    display:flex;align-items:center;justify-content:center;
    width:40px;height:40px;border-radius:8px;
    background:rgba(255,255,255,.05);border:1px solid var(--line);color:var(--text-main);cursor:pointer;
    transition:background .2s ease;
  }
  .nav-toggle:hover{background:rgba(200,245,66,.12)}
  .nav-toggle svg{width:18px;height:18px}
  .mobile-drawer{
    position:fixed;top:0;left:0;right:0;z-index:120;
    background:rgba(11,14,13,.97);backdrop-filter:blur(20px);
    padding:24px;transform:translateY(-110%);transition:transform .3s var(--ease);
    border-bottom:1px solid var(--line);
  }
  .mobile-drawer.open{transform:translateY(0)}
  .mobile-close{
    display:flex;margin-left:auto;margin-bottom:20px;align-items:center;
    width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.05);
    border:1px solid var(--line);color:#fff;cursor:pointer;justify-content:center;
  }
  .mobile-nav-list li{margin-bottom:4px}
  .mobile-nav-list a{
    display:block;padding:12px 12px;border-radius:10px;font-size:17px;color:var(--text-main);
    border-bottom:1px solid var(--line);font-weight:500;
  }
  .mobile-nav-list a:hover{color:var(--accent);background:rgba(255,255,255,.03)}
  .mobile-login{margin-top:22px;width:100%}
}
@media (max-width:767px){
  .container{padding:0 16px}
}

/* global sections */
.main-wrapper{padding-top:72px}
.section-pad{padding:96px 0}
@media (max-width:767px){.section-pad{padding:56px 0}}
.overline{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;letter-spacing:.12em;font-weight:500;color:var(--accent);
}
.overline::before{content:"";width:22px;height:2px;background:var(--accent);opacity:.85}
.section-head{margin-bottom:42px}
.section-head h2{font-size:clamp(28px,3.6vw,42px);line-height:1.18;margin:12px 0 8px;font-weight:800;letter-spacing:-.015em}
.section-head p{color:var(--text-sub);max-width:760px;margin:0;font-size:16px}
.section-num{
  color:var(--accent);font-size:13px;font-weight:700;letter-spacing:.08em;
  border:1px solid rgba(200,245,66,.28);border-radius:999px;padding:4px 12px;
}

/* hero */
.cat-hero{
  position:relative;background-color:var(--page-bg);overflow:hidden;
  padding:98px 0 76px;
}
.cat-hero::before{
  content:"";position:absolute;inset:0;z-index:-2;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center 30%;
}
.cat-hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(90deg,rgba(11,14,13,.97) 0%,rgba(11,14,13,.88) 38%,rgba(11,14,13,.55) 78%,rgba(11,14,13,.85) 100%),
             linear-gradient(180deg,transparent 0%,rgba(11,14,13,.88) 100%);
}
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--text-sub);margin-bottom:26px;
}
.crumb a{color:var(--text-sub);transition:color .2s}
.crumb a:hover{color:var(--accent)}
.crumb-sep{color:var(--text-muted);font-size:12px}
.herowrap{display:flex;flex-wrap:wrap;align-items:center;gap:48px}
.cat-hero-copy{flex:1 1 56%;min-width:300px}
.cat-hero h1{
  font-size:clamp(40px,6vw,76px);line-height:1.05;margin:18px 0 16px;
  font-weight:800;letter-spacing:-.02em;color:#fff;
}
.hero-desc{font-size:17px;color:var(--text-sub);max-width:560px;margin:0 0 26px;line-height:1.8}
.hero-tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.hero-tick{
  display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;
  background:rgba(255,255,255,.04);border:1px solid var(--line);font-size:13px;color:var(--text-sub);
}
.hero-tick b{color:var(--text-main);font-weight:600}
.cat-hero-visual{flex:1 1 36%;min-width:280px;position:relative;display:flex;justify-content:flex-end}
.hero-frame{
  background:var(--card-bg);border:1px solid var(--line);border-radius:20px;padding:12px;
  box-shadow:var(--shadow);width:100%;max-width:420px;
}
.hero-frame img{border-radius:14px;width:100%;height:auto;object-fit:cover;aspect-ratio:5/4}
.hero-float-card{
  position:absolute;left:-12px;bottom:26px;right:auto;
  background:rgba(17,21,19,.92);border:1px solid rgba(200,245,66,.24);
  backdrop-filter:blur(8px);border-radius:14px;padding:14px 18px;
  box-shadow:0 16px 34px rgba(0,0,0,.3);display:flex;align-items:center;gap:12px;
}
.float-pulse{width:8px;height:8px;border-radius:50%;background:var(--danger);position:relative;flex:0 0 auto}
.float-pulse::after{
  content:'';position:absolute;inset:-4px;border-radius:50%;
  border:1px solid rgba(255,75,58,.55);animation:pulse 1.8s infinite;
}
@keyframes pulse{0%{transform:scale(.4);opacity:1}80%,100%{transform:scale(1.4);opacity:0}}
.float-card-text strong{display:block;font-size:15px;color:#fff}
.float-card-text span{font-size:12px;color:var(--text-sub)}
.hero-btns{display:flex;flex-wrap:wrap;gap:12px}
@media (max-width:767px){
  .cat-hero{padding-top:50px;padding-bottom:44px}
  .cat-hero-visual{margin-top:12px}
  .hero-float-card{left:0}
}

/* benefits rows */
.benefit-section{background:var(--page-bg);position:relative}
.benefit-section.panelline::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:calc(100% - 60px);height:1px;background:var(--line);
}
.benefit-list{display:flex;flex-direction:column;gap:18px;margin-top:44px}
.benefit-row{
  position:relative;background:var(--card-bg);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 32px;display:flex;align-items:center;justify-content:space-between;gap:24px;
  transition:transform .3s var(--ease),background .3s ease,border-color .3s ease,box-shadow .3s ease;
  overflow:hidden;
}
.benefit-row::before{
  content:'';position:absolute;left:0;top:18px;bottom:18px;width:3px;border-radius:3px;
  background:var(--accent);opacity:0;transform:scaleY(.5);transition:all .3s var(--ease);
}
.benefit-row:hover{transform:translateY(-4px);background:var(--card-hover);border-color:rgba(200,245,66,.24);box-shadow:var(--shadow-up)}
.benefit-row:hover::before{opacity:1;transform:scaleY(1)}
.benefit-main{display:flex;align-items:flex-start;gap:22px;min-width:0}
.benefit-icon{
  width:54px;height:54px;flex:0 0 auto;border-radius:14px;position:relative;
  display:flex;align-items:center;justify-content:center;
  background:rgba(200,245,66,.08);border:1px solid rgba(200,245,66,.24);color:var(--accent);
}
.benefit-icon svg{width:24px;height:24px}
.benefit-number{
  position:absolute;top:-6px;right:-6px;width:22px;height:22px;
  background:var(--card-hover);border:1px solid rgba(200,245,66,.4);color:var(--accent);
  border-radius:50%;font-size:11px;display:flex;align-items:center;justify-content:center;font-weight:700;
}
.benefit-copy h3{font-size:20px;font-weight:700;margin:2px 0 6px;color:#fff}
.benefit-copy p{margin:0;color:var(--text-sub);font-size:15px;line-height:1.75;max-width:70ch}
.benefit-meta{flex:0 0 auto;display:flex;flex-direction:column;align-items:flex-end;gap:14px}
.badge{
  display:inline-flex;align-items:center;gap:5px;padding:4px 12px;font-size:12px;
  border-radius:999px;background:rgba(255,255,255,.04);border:1px solid var(--line);
  letter-spacing:.05em;color:var(--text-sub);font-weight:500;
}
.badge.hot{background:rgba(255,75,58,.1);border-color:rgba(255,75,58,.35);color:#ff786b}
.arrow-link{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--text-main);
  transition:gap .25s var(--ease),color .2s ease;
}
.arrow-link:hover{color:var(--accent);gap:12px}
.arrow-link svg{width:15px;height:15px}
@media (max-width:767px){
  .benefit-row{flex-direction:column;align-items:stretch;padding:22px 20px}
  .benefit-main{gap:16px}
  .benefit-icon{width:46px;height:46px}
  .benefit-copy h3{font-size:18px}
  .benefit-meta{flex-direction:row;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:14px}
}

/* steps */
.steps-section{background:var(--panel-bg)}
.inner-panel{border:1px solid var(--line);background:var(--page-bg);border-radius:20px;padding:clamp(24px,5vw,72px);margin-top:40px}
.step-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step;
  list-style:none;margin:0;
}
.step-item{
  position:relative;padding:30px 22px 24px;background:var(--card-bg);
  border:1px solid var(--line);border-radius:var(--radius);transition:all .3s var(--ease);
}
.step-item:hover{transform:translateY(-4px);background:var(--card-hover);border-color:rgba(200,245,66,.22)}
.step-no{
  font-size:13px;color:var(--accent);font-weight:700;display:inline-flex;align-items:center;gap:8px;margin-bottom:18px;
}
.step-no::after{content:"";width:22px;height:1px;background:rgba(200,245,66,.5)}
.step-item h3{font-size:18px;font-weight:700;margin:0 0 8px;color:#fff}
.step-item p{font-size:14px;color:var(--text-sub);margin:0;line-height:1.7}
.step-connector{position:absolute;right:-15px;top:50%;transform:translateY(-50%);color:var(--text-muted);z-index:2}
@media (max-width:1023px){
  .step-grid{grid-template-columns:repeat(2,1fr)}
  .step-connector{display:none}
}
@media (max-width:520px){
  .step-grid{grid-template-columns:1fr}
}

/* device proof */
.device-section{position:relative}
.device-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;margin-top:24px}
.device-copy h2{font-size:clamp(28px,3.4vw,40px);line-height:1.2;font-weight:800;letter-spacing:-.015em;margin:12px 0 18px}
.device-copy>p{color:var(--text-sub);font-size:16px;max-width:600px;margin:0 0 26px}
.check-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}
.check-list li{
  display:flex;align-items:flex-start;gap:10px;background:rgba(255,255,255,.03);
  border:1px solid var(--line);border-radius:10px;padding:13px 15px;color:var(--text-main);
  font-size:14px;font-weight:500;transition:border-color .2s ease;
}
.check-list li:hover{border-color:rgba(200,245,66,.3)}
.check-list svg{flex:0 0 auto;width:17px;height:17px;color:var(--accent);margin-top:3px}
.device-media{position:relative}
.device-media img{border-radius:20px;width:100%;height:auto;object-fit:cover;aspect-ratio:4/3;box-shadow:var(--shadow)}
.device-tag-card{
  position:absolute;right:10%;bottom:-18px;background:var(--accent);color:var(--accent-ink);
  border-radius:12px;padding:14px 22px;display:flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;box-shadow:0 14px 26px rgba(0,0,0,.28);
}
.device-tag-card b{font-size:26px;font-weight:800}
@media (max-width:1023px){
  .device-grid{grid-template-columns:1fr;gap:40px}
  .device-media{max-width:560px}
}
@media (max-width:640px){
  .check-list{grid-template-columns:1fr}
}

/* faq */
.faq-section{background:var(--panel-bg)}
.faq-wrap{max-width:900px;margin:0 auto}
.accordion.site-accordion{border-bottom:0;background:transparent;margin-top:34px}
.site-accordion .accordion-item{background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;transition:border-color .2s ease}
.site-accordion .accordion-item:last-child{border-bottom:0}
.site-accordion .accordion-title{
  position:relative;background:transparent;color:var(--text-main);padding:24px 42px 24px 0;
  border:0;outline:none;font-size:17px;font-weight:600;line-height:1.5;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.site-accordion .accordion-title:hover,.site-accordion .accordion-title:focus{background:transparent;color:var(--accent)}
.site-accordion .accordion-title::before,.site-accordion .accordion-title::after{
  content:"";position:absolute;right:8px;top:50%;width:14px;height:2px;background:var(--accent);
  transition:transform .3s var(--ease),opacity .2s ease;transform:translateY(-50%)
}
.site-accordion .accordion-title::after{transform:translateY(-50%) rotate(90deg)}
.site-accordion .accordion-item.is-active>.accordion-title::before{opacity:0}
.site-accordion .accordion-item.is-active>.accordion-title::after{transform:translateY(-50%) rotate(0deg)}
.site-accordion .accordion-content{
  background:transparent;border:0;color:var(--text-sub);
  position:relative;padding:4px 72px 28px 0;font-size:15px;line-height:1.8;
}
.site-accordion .accordion-content p:last-child{margin-bottom:0}

/* cta */
.cta-block{position:relative;overflow:hidden;padding:120px 0}
.cta-block::before{
  content:"";position:absolute;inset:0;z-index:-2;
  background-image:url('/assets/images/backpic/back-3.png');
  background-size:cover;background-position:center;
}
.cta-block::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(100deg,rgba(11,14,13,.95) 0%,rgba(11,14,13,.62) 58%,rgba(11,14,13,.88) 100%);
}
.cta-grid{display:grid;grid-template-columns:1fr auto;align-items:end;gap:40px}
.cta-copy h2{font-size:clamp(30px,4.2vw,52px);line-height:1.15;margin:0 0 14px;font-weight:800;letter-spacing:-.02em;color:#fff}
.cta-copy p{color:var(--text-sub);margin:0;font-size:16px;max-width:590px}
@media (max-width:1023px){
  .cta-block{padding:96px 0}
  .cta-grid{grid-template-columns:1fr}
}

/* footer */
.site-footer{
  background:#0d100e;
  border-top:1px solid var(--line);
  padding:74px 0 32px;color:var(--text-sub);
}
.footer-grid{row-gap:48px}
.footer-brand-col{margin-bottom:8px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-brand-logo{
  width:42px;height:42px;flex:0 0 auto;border-radius:10px;background:var(--accent);
  color:var(--accent-ink);display:flex;align-items:center;justify-content:center;
  font-size:20px;font-weight:800;
}
.footer-brand-name{font-size:19px;margin:0;color:#fff;font-weight:700}
.footer-desc{font-size:14px;line-height:1.85;color:var(--text-sub);margin:0;max-width:420px}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin:0 0 18px;letter-spacing:.03em}
.f-link{display:block;padding:6px 0;font-size:14px;color:var(--text-sub);transition:color .2s ease,transform .2s ease;width:fit-content}
.f-link:hover{color:var(--accent);transform:translateX(3px)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;
  border-top:1px solid var(--line);padding-top:26px;margin-top:64px;
  font-size:13px;color:var(--text-muted);
}
.footer-bottom-meta{color:var(--text-muted)}
@media (max-width:639px){
  .site-footer{padding-top:52px}
  .footer-bottom{margin-top:40px}
}

/* back top */
.back-top{
  position:fixed;right:18px;bottom:22px;z-index:90;width:44px;height:44px;border-radius:50%;
  background:rgba(255,255,255,.07);border:1px solid var(--line-strong);color:var(--text-main);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background .2s ease,color .2s ease,box-shadow .2s ease,transform .2s ease;
  opacity:0;pointer-events:none;font-size:18px;line-height:1;
}
.back-top.show{opacity:1;pointer-events:auto}
.back-top:hover{background:var(--accent);color:var(--accent-ink);box-shadow:0 8px 20px rgba(200,245,66,.25);transform:translateY(-3px)}

/* misc */
.live-pill{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,75,58,.11);border:1px solid rgba(255,75,58,.32);
  color:#ff8c80;border-radius:999px;padding:4px 12px;font-size:12px;font-weight:600;
  letter-spacing:.03em;
}
.live-dot{width:6px;height:6px;border-radius:50%;background:var(--danger);position:relative}
.live-dot::after{content:'';position:absolute;inset:-3px;border-radius:50%;background:rgba(255,75,58,.35);animation:pulse 1.6s infinite}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* roulang page: category4 */
:root {
  --bg: #0B0E0D;
  --bg-panel: #111513;
  --bg-card: #171C19;
  --bg-card-hover: #1C221E;
  --bg-elevated: #1C221E;
  --accent: #C8F542;
  --accent-bright: #D6FC66;
  --accent-ink: #111803;
  --text: #F2F3EC;
  --text-muted: #A7AEA5;
  --text-weak: #6B746C;
  --border: rgba(240, 243, 236, 0.08);
  --border-accent: rgba(200, 245, 66, 0.28);
  --danger: #FF4B3A;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.18);
  --shadow-card-hover: 0 18px 40px rgba(0, 0, 0, 0.28);
  --font-family: "PingFang SC", "HarmonyOS Sans", "MiSans", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.8;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

ul,
ol {
  margin: 0;
}

button,
input,
textarea,
select {
  font-family: inherit;
  font-size: 100%;
  line-height: 1.6;
}

input[type="text"],
input[type="tel"],
input[type="email"],
textarea {
  -webkit-appearance: none;
  appearance: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.grid-container {
  max-width: 1280px;
  padding-left: 24px;
  padding-right: 24px;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

/* 按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.01em;
  line-height: 1;
  height: 46px;
  padding: 0 28px;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease, filter 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 0 0 rgba(200, 245, 66, 0);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--accent-bright);
  box-shadow: 0 8px 24px rgba(200, 245, 66, 0.18);
  color: var(--accent-ink);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(200, 245, 66, 0.12);
}

.btn-secondary {
  background: transparent;
  border-color: rgba(242, 243, 236, 0.22);
  color: var(--text);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-secondary:active {
  transform: translateY(0);
}

.btn-lg {
  min-width: 160px;
  height: 50px;
}

/* 页头导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  height: 72px;
  display: flex;
  align-items: center;
  background: rgba(11, 14, 13, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
  transition: height 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.site-header.scrolled {
  height: 60px;
  background: rgba(11, 14, 13, 0.96);
  border-bottom-color: var(--border);
}

.header-inner {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
}

.header-col {
  display: flex;
  align-items: center;
  min-width: 0;
}

.header-col-left {
  justify-content: flex-start;
}

.header-col-right {
  justify-content: flex-end;
  gap: 18px;
}

.nav-side {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-item {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.nav-item .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: transparent;
  display: inline-block;
  flex: 0 0 auto;
}

.nav-item::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}

.nav-item:hover,
.nav-item.active {
  color: var(--text);
}

.nav-item:hover::after,
.nav-item.active::after {
  transform: scaleX(1);
}

.nav-item.active .dot {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(200, 245, 66, 0.12);
}

.header-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  white-space: nowrap;
}

.header-brand .brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 800;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.btn-login {
  height: 38px;
  padding: 0 20px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 700;
  box-shadow: none;
}

.btn-login:hover {
  background: var(--accent-bright);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(200, 245, 66, 0.14);
}

/* 移动端菜单按钮 */
.mobile-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid rgba(240, 243, 236, 0.12);
  background: rgba(255, 255, 255, 0.04);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
  padding: 0;
}

.mobile-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.mobile-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  background: rgba(17, 21, 19, 0.98);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: max-height 0.3s ease, opacity 0.2s ease;
  z-index: 110;
}

.mobile-nav.open {
  max-height: 520px;
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav .grid-container {
  display: grid;
  gap: 2px;
  padding-top: 16px;
  padding-bottom: 24px;
}

.mobile-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 8px;
  border-radius: 10px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 16px;
}

.mobile-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.mobile-link .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}

.mobile-link.active .dot {
  background: var(--accent);
}

.mobile-link.active {
  color: var(--text);
}

/* Hero 帮助页 */
.help-hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 64vh;
  padding: 170px 0 84px;
  background-size: cover;
  background-position: center 30%;
  overflow: hidden;
}

.help-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(11, 14, 13, 0.96) 0%, rgba(11, 14, 13, 0.82) 47%, rgba(11, 14, 13, 0.45) 100%);
  z-index: 1;
}

.help-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 130px;
  background: linear-gradient(180deg, transparent 0%, var(--bg) 100%);
  z-index: 1;
}

.help-hero .hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.help-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.help-kicker .live-dot {
  width: 7px;
  height: 7px;
  background: var(--danger);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(255, 75, 58, 0.5);
  animation: pulse-dot 2s infinite;
}

.help-kicker .live-label {
  color: var(--accent);
  font-weight: 600;
}

@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(255, 75, 58, 0.4); }
  70% { box-shadow: 0 0 0 6px rgba(255, 75, 58, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 75, 58, 0); }
}

.hero-title {
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--text);
}

.hero-sub {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}

.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-weak);
}

.hero-note strong {
  color: var(--text-muted);
  font-weight: 600;
}

.crumb-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-weak);
  margin-bottom: 22px;
}

.crumb-line a {
  color: var(--text-muted);
}

.crumb-line a:hover {
  color: var(--accent);
}

.crumb-sep {
  opacity: 0.5;
}

/* 页面区块间距 */
.page-section {
  padding: 96px 0;
}

.section-overline {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.2;
  color: var(--text);
  font-weight: 750;
  letter-spacing: -0.015em;
  margin: 0;
}

.section-lead {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.8;
  margin: 14px 0 0;
  max-width: 680px;
}

/* 问题分类导航 */
.topic-panel {
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: 72px 0;
}

.topic-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 30px;
}

.topic-head .section-title {
  font-size: 30px;
  line-height: 1.25;
}

.topic-head .section-lead {
  margin-top: 8px;
}

.topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.topic-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 18px;
  border: 1px solid rgba(242, 243, 236, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.topic-chip i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-weak);
  transition: background 0.2s ease;
}

.topic-chip:hover,
.topic-chip:focus-visible {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
}

.topic-chip:hover i,
.topic-chip:focus-visible i {
  background: var(--accent);
}

/* FAQ 主体 */
.faq-layout {
  padding: 96px 0 56px;
}

.faq-overview {
  padding-right: 30px;
}

.faq-overview-sticky {
  position: sticky;
  top: 110px;
  padding: 28px 0;
}

.faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-index-list li {
  border-bottom: 1px solid var(--border);
}

.faq-index-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 600;
}

.faq-index-list a span {
  font-size: 13px;
  color: var(--text-weak);
  min-width: 24px;
}

.faq-index-list a:hover {
  color: var(--accent);
}

.faq-index-list a.active {
  color: var(--text);
}

.faq-extra-note {
  margin-top: 28px;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

.faq-extra-note a {
  color: var(--accent);
  font-weight: 700;
}

.faq-blocks {
  min-width: 0;
}

.faq-block {
  margin-bottom: 28px;
}

.faq-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(200, 245, 66, 0.16);
  margin-bottom: 6px;
}

.faq-block-head .block-num {
  font-size: 14px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.faq-block-head .block-title {
  font-size: 22px;
  font-weight: 750;
  color: var(--text);
  margin: 0;
  line-height: 1.4;
}

/* 手风琴覆盖 Foundation 默认视觉 */
ul.accordion {
  margin: 0;
  background: transparent;
  list-style: none;
  border: 0;
}

.accordion-item {
  background: transparent;
  border-bottom: 1px solid var(--border);
  border-left: 0;
  border-right: 0;
  border-top: 0;
}

.accordion-item:first-child {
  border-top: 0;
}

.accordion-title {
  display: block;
  position: relative;
  padding: 24px 56px 24px 4px;
  color: var(--text);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  background: transparent;
  border: 0;
  cursor: pointer;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.accordion-title:hover,
.accordion-title:focus {
  background: transparent;
  color: var(--accent);
  padding-left: 8px;
}

.accordion-title::before {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(242, 243, 236, 0.2);
  border-radius: 50%;
  font-size: 18px;
  font-weight: 500;
  color: var(--accent);
  transition: transform 0.25s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.accordion-title::after {
  display: none;
}

.accordion-item.is-active > .accordion-title {
  background: transparent;
  color: var(--accent);
}

.accordion-item.is-active > .accordion-title::before {
  content: "−";
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  transform: translateY(-50%) rotate(180deg);
}

.accordion-content {
  display: none;
  padding: 0 48px 26px 8px;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
}

.accordion-content p {
  margin: 0 0 10px;
}

.accordion-content p:last-child {
  margin-bottom: 0;
}

.accordion-item.is-active > .accordion-content {
  display: block;
}

.faq-more {
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
}

/* 提交咨询区 */
.help-contact {
  background: linear-gradient(180deg, var(--bg) 0%, #0D1110 100%);
  padding: 96px 0 110px;
}

.contact-visual {
  padding-right: 40px;
}

.contact-title {
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 750;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 12px 0 16px;
}

.contact-desc {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 24px;
}

.contact-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-muted);
  font-size: 15px;
}

.contact-list li i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  flex: 0 0 auto;
  margin-top: 10px;
}

.contact-media {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  margin-top: 8px;
  max-width: 520px;
}

.contact-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.form-card {
  background: var(--bg-panel);
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  padding: 34px;
}

.form-card-heading {
  margin-bottom: 26px;
}

.form-card-heading h3 {
  margin: 0 0 8px;
  font-size: 26px;
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--text);
}

.form-card-heading p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

.form-card label {
  display: block;
  color: var(--text-weak);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 20px;
}

.form-field {
  display: block;
  width: 100%;
  height: 46px;
  border: 1px solid rgba(242, 243, 236, 0.12);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 0 15px;
  font-size: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

textarea.form-field {
  height: auto;
  min-height: 138px;
  padding: 14px 16px;
  resize: vertical;
  line-height: 1.7;
}

.form-field::placeholder {
  color: var(--text-weak);
  opacity: 1;
}

.form-field:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(200, 245, 66, 0.12);
  background: rgba(255, 255, 255, 0.055);
}

.form-message {
  display: block;
  text-align: center;
  margin-top: 18px;
  color: var(--accent);
  background: rgba(200, 245, 66, 0.08);
  border-radius: 10px;
  padding: 0;
  height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  transition: height 0.25s ease, opacity 0.25s ease, padding 0.25s ease;
}

.form-message.show {
  height: auto;
  opacity: 1;
  padding: 13px 12px;
  margin-top: 18px;
}

.form-privacy {
  font-size: 12px;
  color: var(--text-weak);
  line-height: 1.7;
  margin-top: 15px;
}

.form-submit-row {
  margin-top: 24px;
}

.form-submit-row .btn {
  width: 100%;
}

/* 页脚 */
.site-footer {
  background: #090C0B;
  border-top: 1px solid var(--border);
  padding: 74px 0 0;
  margin-top: 0;
}

.footer-grid {
  row-gap: 42px;
}

.footer-grid > .cell {
  padding-right: 24px;
}

.footer-brand-col {
  padding-right: 30px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.footer-brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  flex: 0 0 auto;
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  margin: 0;
  letter-spacing: 0;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
}

.footer-col h4 {
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 18px;
  letter-spacing: 0.02em;
}

.f-link {
  display: block;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  padding: 6px 0;
}

.f-link:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  margin-top: 58px;
  padding: 24px 0 28px;
  font-size: 13px;
  color: var(--text-weak);
}

.footer-bottom-copy {
  color: var(--text-weak);
}

.footer-bottom-meta {
  color: var(--text-weak);
}

/* 返回顶部 */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 28px;
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.back-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

/* 响应式 */
@media screen and (max-width: 1100px) {
  .nav-side {
    gap: 18px;
  }
  .nav-item {
    font-size: 14px;
  }
  .header-brand {
    font-size: 18px;
  }
  .btn-login {
    padding: 0 14px;
  }
}

@media screen and (max-width: 1023.98px) {
  .site-header,
  .site-header.scrolled {
    height: 60px;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .nav-side {
    display: none;
  }

  .btn-login {
    display: none;
  }

  .header-inner {
    display: flex;
    justify-content: space-between;
    gap: 14px;
  }

  .header-col-left {
    flex: 0 0 auto;
  }

  .header-col-center {
    flex: 1;
    justify-content: center;
  }

  .header-col-right {
    flex: 0 0 auto;
  }

  .mobile-nav {
    top: 60px;
  }

  .page-section {
    padding: 72px 0;
  }

  .faq-layout {
    padding: 72px 0 44px;
  }

  .faq-overview {
    padding-right: 0;
    margin-bottom: 12px;
  }

  .faq-overview-sticky {
    position: static;
    padding: 0;
  }

  .faq-index-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
  }

  .faq-index-list li {
    border: 0;
  }

  .faq-index-list a {
    padding: 8px 0;
    font-size: 14px;
  }

  .contact-visual {
    padding-right: 0;
    margin-bottom: 30px;
  }

  .help-contact {
    padding: 72px 0 84px;
  }
}

@media screen and (max-width: 767.98px) {
  .grid-container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-inner {
    padding: 0 14px;
  }

  .brand-text {
    font-size: 17px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
    font-size: 15px;
    border-radius: 8px;
  }

  .help-hero {
    padding: 130px 0 64px;
    min-height: 520px;
  }

  .hero-title {
    font-size: 42px;
    line-height: 1.15;
  }

  .hero-sub {
    font-size: 15px;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    width: 100%;
    padding: 0 18px;
  }

  .topic-panel {
    padding: 56px 0;
  }

  .topic-nav {
    gap: 8px;
  }

  .topic-chip {
    height: 40px;
    padding: 0 14px;
    font-size: 13px;
  }

  .faq-block-head .block-title {
    font-size: 19px;
  }

  .accordion-title {
    font-size: 16px;
    padding: 20px 46px 20px 2px;
  }

  .accordion-title:hover {
    padding-left: 6px;
  }

  .accordion-content {
    padding: 0 32px 20px 4px;
  }

  .contact-list {
    margin-bottom: 18px;
  }

  .form-card {
    padding: 24px 18px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .form-card-heading h3 {
    font-size: 22px;
  }

  .site-footer {
    padding-top: 56px;
  }

  .footer-grid > .cell {
    padding-right: 16px;
  }

  .footer-brand-name {
    font-size: 18px;
  }

  .footer-bottom {
    margin-top: 40px;
    align-items: flex-start;
    justify-content: flex-start;
    flex-direction: column;
  }
}

@media screen and (max-width: 520px) {
  .logo-text .brand-full {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}