/* roulang page: index */
:root {
  --bg-primary: #050D1F;
  --bg-secondary: #0A1830;
  --bg-tertiary: #0F2240;
  --accent: #00E5FF;
  --accent-blue: #3D7BFF;
  --accent-pink: #FF5C8A;
  --accent-amber: #FFD166;
  --text-primary: #EAF4FF;
  --text-secondary: #94ABC8;
  --text-muted: #5E7799;
  --text-invert: #0B1B33;
  --border-card: rgba(255,255,255,0.10);
  --radius-card: 20px;
  --radius-sm: 16px;
  --shadow-card: 0 16px 40px rgba(0,0,0,0.35);
  --glow-cyan: 0 0 28px rgba(0,229,255,0.35);
  --glass-bg: rgba(12,25,52,0.66);
  --content-width: 1280px;
  --header-height: 68px;
  --section-pad: 96px;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width:100%; display:block; }
a { color: var(--accent); text-decoration:none; transition: color .2s; }
a:hover { text-decoration:underline; text-underline-offset:4px; }
button { font-family:inherit; cursor:pointer; border:none; background:none; color:inherit; }
input { font-family:inherit; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline:2px solid var(--accent);
  outline-offset:3px;
}
.container { max-width:var(--content-width); margin:0 auto; padding:0 32px; }
.section { padding:var(--section-pad) 0; }
.section-head { margin-bottom:44px; }
.section-title { font-size:32px; font-weight:800; line-height:1.3; letter-spacing:-0.5px; }
.section-sub { color:var(--text-secondary); font-size:15px; margin-top:10px; max-width:480px; }
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  border-radius:999px; font-weight:600; font-size:15px;
  padding:12px 28px; transition: box-shadow .25s, transform .2s, background .25s, border-color .25s;
  white-space:nowrap; border:1px solid transparent;
}
.btn:hover { text-decoration:none; }
.btn-primary {
  background:linear-gradient(135deg, var(--accent), var(--accent-blue));
  color:var(--text-invert);
  box-shadow: var(--glow-cyan);
}
.btn-primary:hover { box-shadow:0 0 42px rgba(0,229,255,0.55); transform:translateY(-2px); }
.btn-primary:active { transform:translateY(1px); box-shadow:0 0 20px rgba(0,229,255,0.4); }
.btn-secondary {
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.18);
  color:var(--text-primary);
}
.btn-secondary:hover { border-color:rgba(0,229,255,0.5); color:var(--accent); transform:translateY(-2px); }
.btn-outline {
  border:1px solid rgba(0,229,255,0.35);
  color:var(--accent);
  background:transparent;
}
.btn-outline:hover { background:rgba(0,229,255,0.12); border-color:var(--accent); }
/* ---- Header ---- */
.site-header {
  position:fixed; top:0; left:0; right:0; height:var(--header-height);
  background:rgba(5,13,31,0.82);
  backdrop-filter:blur(16px); -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,0.06);
  z-index:1000;
}
.nav-wrap { display:flex; align-items:center; justify-content:space-between; height:var(--header-height); gap:20px; }
.brand { display:flex; align-items:center; gap:10px; color:var(--text-primary); font-size:18px; font-weight:700; letter-spacing:0.2px; }
.brand:hover { text-decoration:none; color:var(--text-primary); }
.brand svg { flex-shrink:0; }
.nav-links { display:flex; align-items:center; gap:28px; }
.nav-links a { color:var(--text-secondary); font-size:15px; font-weight:500; position:relative; padding:6px 0; transition:color .2s; }
.nav-links a:hover { color:#fff; text-decoration:none; }
.nav-links a.active { color:var(--accent); }
.nav-links a.active::after {
  content:''; position:absolute; left:0; right:0; bottom:-2px; height:2px;
  background:var(--accent); box-shadow:0 0 10px var(--accent);
  border-radius:2px;
}
.nav-actions { display:flex; align-items:center; gap:14px; }
.search-box {
  display:flex; align-items:center; gap:8px;
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.12);
  border-radius:999px; padding:0 16px; height:40px; width:200px;
  transition: border-color .2s, box-shadow .2s;
}
.search-box:focus-within { border-color:var(--accent); box-shadow:0 0 0 3px rgba(0,229,255,0.15); }
.search-box svg { flex-shrink:0; opacity:0.6; }
.search-box input { background:none; border:none; outline:none; color:var(--text-primary); font-size:13px; width:100%; }
.search-box input::placeholder { color:var(--text-muted); }
.icon-btn {
  width:40px; height:40px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.12);
  color:var(--text-primary); transition: border-color .2s, color .2s;
}
.icon-btn:hover { border-color:var(--accent); color:var(--accent); text-decoration:none; }
.header-login-btn { padding:9px 22px; font-size:14px; }
.menu-toggle {
  display:none; width:44px; height:44px; border-radius:12px;
  background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.12);
  color:var(--text-primary); font-size:20px; align-items:center; justify-content:center;
}
.mobile-menu {
  display:none; position:fixed; top:calc(var(--header-height) + 12px); left:16px; right:16px;
  background:rgba(10,24,48,0.92); backdrop-filter:blur(24px); -webkit-backdrop-filter:blur(24px);
  border:1px solid rgba(255,255,255,0.12); border-radius:20px;
  padding:24px 20px; z-index:999; box-shadow:0 24px 64px rgba(0,0,0,0.5);
}
.mobile-menu.open { display:block; }
.mobile-menu a.m-menu-link { display:block; padding:14px 8px; color:var(--text-primary); font-size:16px; font-weight:500; border-bottom:1px solid rgba(255,255,255,0.06); }
.mobile-menu a.m-menu-link.active { color:var(--accent); }
.mobile-menu a.m-menu-link:hover { text-decoration:none; color:var(--accent); }
.mobile-menu .m-search { display:flex; align-items:center; gap:8px; background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.12); border-radius:999px; padding:0 16px; height:44px; margin:16px 0; }
.mobile-menu .m-search input { background:none; border:none; outline:none; color:var(--text-primary); font-size:14px; width:100%; }
.mobile-menu .m-search input::placeholder { color:var(--text-muted); }
.mobile-menu .m-login { display:flex; gap:12px; margin-top:8px; }
.mobile-menu .m-login .btn { flex:1; }
/* ---- Hero ---- */
.hero {
  position:relative; min-height:600px; display:flex; align-items:center;
  padding:calc(var(--header-height) + 60px) 0 80px;
  background:url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  overflow:hidden;
}
.hero::before {
  content:''; position:absolute; inset:0;
  background:linear-gradient(120deg, rgba(5,13,31,0.96) 0%, rgba(5,13,31,0.88) 40%, rgba(10,24,48,0.72) 70%, rgba(10,24,48,0.55) 100%);
}
.hero::after {
  content:''; position:absolute; width:420px; height:420px; border-radius:50%;
  background:radial-gradient(circle, rgba(0,229,255,0.14), transparent 70%);
  right:8%; top:10%; pointer-events:none;
}
.hero-inner { position:relative; z-index:2; display:grid; grid-template-columns:1fr auto; gap:64px; align-items:center; width:100%; }
.hero-copy { max-width:640px; }
.hero-badges { display:flex; gap:14px; flex-wrap:wrap; margin-bottom:22px; }
.hero-badge {
  display:inline-flex; align-items:center; gap:7px;
  background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.12);
  border-radius:999px; padding:6px 14px; font-size:13px; color:var(--text-secondary);
}
.hero-badge .dot { width:6px; height:6px; border-radius:50%; background:var(--accent); box-shadow:0 0 8px var(--accent); }
.hero h1 { font-size:44px; font-weight:900; line-height:1.2; letter-spacing:-1px; margin-bottom:20px; }
.hero h1 em { font-style:normal; color:var(--accent); }
.hero-lead { font-size:16px; color:var(--text-secondary); line-height:1.9; max-width:560px; margin-bottom:32px; }
.hero-ctas { display:flex; gap:16px; flex-wrap:wrap; margin-bottom:52px; }
.hero-trust { display:flex; gap:32px; flex-wrap:wrap; border-top:1px solid rgba(255,255,255,0.08); padding-top:28px; }
.trust-item { display:flex; align-items:center; gap:8px; font-size:13px; color:var(--text-secondary); }
.trust-item svg { color:var(--accent); }
/* Phone frame */
.phone-wrap { position:relative; }
.phone-frame {
  width:300px; height:520px; border-radius:24px; overflow:hidden; position:relative;
  border:2px solid rgba(255,255,255,0.16);
  background:url('/assets/images/backpic/back-2.webp') center / cover no-repeat;
  box-shadow:0 0 80px rgba(0,229,255,0.15), 0 30px 60px rgba(0,0,0,0.55);
}
.phone-topbar { position:absolute; top:0; left:0; right:0; display:flex; justify-content:space-between; padding:14px 18px; font-size:11px; color:rgba(255,255,255,0.9); z-index:3; }
.phone-content {
  position:absolute; left:0; right:0; top:80px; z-index:2; padding:0 18px;
}
.phone-content .p-title {
  font-size:17px; font-weight:800; color:#fff; line-height:1.4;
  background:linear-gradient(to right, rgba(5,13,31,0.6), rgba(5,13,31,0.2));
  padding:12px 14px; border-radius:14px; backdrop-filter:blur(4px);
  border-left:3px solid var(--accent);
}
.phone-content .p-sub { font-size:12px; color:rgba(255,255,255,0.75); margin-top:10px; padding-left:14px; }
.phone-actions { position:absolute; right:12px; bottom:64px; display:flex; flex-direction:column; gap:14px; z-index:3; }
.phone-action {
  width:38px; height:38px; border-radius:50%;
  background:rgba(5,13,31,0.55); backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,0.18);
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:14px; transition: transform .2s, background .2s;
}
.phone-action:hover { transform:scale(1.1); background:rgba(0,229,255,0.25); }
.phone-progress { position:absolute; left:18px; right:18px; bottom:28px; height:3px; background:rgba(255,255,255,0.2); border-radius:99px; z-index:3; overflow:hidden; }
.phone-progress span { display:block; width:65%; height:100%; background:var(--accent); border-radius:99px; }
/* ---- Clip section ---- */
.clip-section { background:var(--bg-secondary); }
.clip-track { position:relative; }
.clip-scroll {
  display:flex; gap:20px; overflow-x:auto;
  scroll-snap-type:x mandatory; padding:6px 6px 28px;
  scrollbar-width:none; -ms-overflow-style:none;
}
.clip-scroll::-webkit-scrollbar { display:none; }
.clip-track::after {
  content:''; position:absolute; top:0; right:0; bottom:28px; width:70px;
  background:linear-gradient(to right, transparent, var(--bg-secondary));
  pointer-events:none;
}
.clip-card {
  min-width:260px; width:260px; aspect-ratio:4/5; position:relative;
  border-radius:var(--radius-card); overflow:hidden; scroll-snap-align:start;
  background:var(--bg-tertiary); border:1px solid var(--border-card);
  transition: transform .3s, box-shadow .3s, border-color .3s;
  display:flex; flex-direction:column;
}
.clip-card:hover { transform:translateY(-6px); border-color:rgba(0,229,255,0.35); box-shadow:0 20px 48px rgba(0,0,0,0.45); text-decoration:none; }
.clip-card .cover { flex:1; min-height:0; overflow:hidden; position:relative; }
.clip-card .cover img { width:100%; height:100%; object-fit:cover; }
.clip-card .cover::after { content:''; position:absolute; inset:0; background:linear-gradient(transparent 50%, rgba(5,13,31,0.9) 100%); }
.clip-badge {
  position:absolute; top:14px; left:14px; z-index:3;
  background:linear-gradient(135deg, var(--accent-pink), #FF8A5C);
  color:#fff; font-size:12px; font-weight:700;
  padding:5px 14px; border-radius:999px;
  box-shadow:0 4px 16px rgba(255,92,138,0.4);
}
.clip-badge.hot { background:linear-gradient(135deg, var(--accent-amber), #FF9F43); box-shadow:0 4px 16px rgba(255,209,102,0.35); }
.clip-info { position:absolute; left:0; right:0; bottom:0; z-index:2; padding:16px; }
.clip-info h3 { font-size:16px; font-weight:700; color:#fff; margin-bottom:6px; }
.clip-tags { display:flex; gap:6px; margin-bottom:8px; }
.clip-tags span {
  font-size:11px; color:var(--accent);
  background:rgba(0,229,255,0.12); border-radius:999px; padding:2px 9px;
}
.clip-stats { display:flex; gap:14px; font-size:12px; color:rgba(255,255,255,0.65); }
.clip-play {
  position:absolute; right:14px; bottom:14px; z-index:3;
  width:36px; height:36px; border-radius:50%;
  background:var(--accent); color:var(--text-invert);
  display:flex; align-items:center; justify-content:center;
  font-size:13px; box-shadow:0 0 18px rgba(0,229,255,0.4);
  transition: transform .2s;
}
.clip-card:hover .clip-play { transform:scale(1.12); }
/* ---- Checklist ---- */
.check-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.check-card {
  background:var(--glass-bg); border:1px solid var(--border-card);
  border-radius:var(--radius-card); padding:28px 26px;
  position:relative; overflow:hidden;
  transition: transform .3s, border-color .3s, box-shadow .3s;
}
.check-card:hover { transform:translateY(-5px); border-color:rgba(0,229,255,0.35); box-shadow:0 18px 44px rgba(0,0,0,0.4); }
.check-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:linear-gradient(90deg, var(--accent), transparent);
  opacity:0; transition:opacity .3s;
}
.check-card:hover::before { opacity:1; }
.check-num {
  font-size:56px; font-weight:900; line-height:1; color:rgba(0,229,255,0.16);
  -webkit-text-stroke:1px rgba(0,229,255,0.35);
  margin-bottom:18px; font-family:inherit;
}
.check-card h3 { font-size:19px; font-weight:700; margin-bottom:12px; }
.check-card p { font-size:14px; color:var(--text-secondary); line-height:1.8; margin-bottom:20px; }
.check-more { display:inline-flex; align-items:center; gap:5px; font-size:14px; font-weight:600; color:var(--accent); transition: gap .2s; }
.check-more:hover { gap:10px; text-decoration:none; }
/* ---- Reputation ---- */
.reputation-section { background:var(--bg-secondary); }
.rating-head { display:flex; align-items:center; gap:40px; flex-wrap:wrap; margin-bottom:40px; }
.rating-stars { display:flex; align-items:center; gap:14px; }
.stars { color:var(--accent-amber); font-size:26px; letter-spacing:3px; }
.rating-num { font-size:40px; font-weight:900; color:var(--text-primary); line-height:1; }
.rating-label { font-size:13px; color:var(--text-secondary); }
.rating-metric { display:flex; align-items:center; gap:10px; padding:10px 18px; background:var(--glass-bg); border:1px solid var(--border-card); border-radius:999px; }
.rating-metric .value { font-size:20px; font-weight:800; color:var(--accent-amber); }
.rating-metric .name { font-size:13px; color:var(--text-secondary); }
.bubbles-row { display:flex; gap:16px; overflow-x:auto; padding:10px 4px 20px; scrollbar-width:none; }
.bubbles-row::-webkit-scrollbar { display:none; }
.bubble {
  min-width:260px; max-width:320px;
  background:var(--glass-bg); backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,0.10);
  border-radius:999px; padding:14px 22px;
  font-size:13px; color:rgba(255,255,255,0.82); line-height:1.6;
  flex-shrink:0; transition: border-color .25s, transform .25s;
}
.bubble:hover { border-color:rgba(0,229,255,0.3); transform:translateY(-2px); }
.bubble strong { color:var(--accent); font-weight:600; }
/* ---- News / CMS ---- */
.news-section { background:var(--bg-primary); }
.news-list { display:flex; flex-direction:column; gap:16px; }
.news-item {
  display:grid; grid-template-columns:160px 1fr; gap:22px;
  background:var(--glass-bg); border:1px solid var(--border-card);
  border-radius:var(--radius-card); padding:16px 20px; color:var(--text-primary);
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.news-item:hover { transform:translateY(-3px); border-color:rgba(0,229,255,0.35); box-shadow:0 14px 36px rgba(0,0,0,0.35); text-decoration:none; color:var(--text-primary); }
.news-thumb { border-radius:var(--radius-sm); overflow:hidden; background:var(--bg-tertiary); height:100px; width:160px; }
.news-thumb img { width:100%; height:100%; object-fit:cover; }
.news-body { display:flex; flex-direction:column; justify-content:center; min-width:0; }
.news-meta { display:flex; align-items:center; gap:14px; margin-bottom:6px; }
.news-tag {
  font-size:12px; color:var(--accent); font-weight:600;
  background:rgba(0,229,255,0.12); border-radius:999px; padding:2px 12px;
}
.news-date { font-size:12px; color:var(--text-muted); }
.news-title { font-size:17px; font-weight:700; line-height:1.4; margin-bottom:5px; color:var(--text-primary); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.news-summary {
  font-size:13px; color:var(--text-secondary); line-height:1.6;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
}
.news-more { margin-top:6px; font-size:13px; color:var(--accent); font-weight:600; }
.news-empty {
  background:rgba(255,255,255,0.03); border:1px dashed rgba(255,255,255,0.14);
  border-radius:var(--radius-card); padding:64px 24px; text-align:center;
  color:var(--text-secondary); font-size:15px;
}
.news-empty-icon {
  width:52px; height:52px; margin:0 auto 16px; border-radius:50%;
  border:2px solid rgba(0,229,255,0.35); position:relative;
}
.news-empty-icon::before, .news-empty-icon::after {
  content:''; position:absolute; width:18px; height:2px; background:rgba(0,229,255,0.5);
  top:50%; left:50%; transform:translate(-50%,-50%) rotate(45deg); border-radius:2px;
}
.news-empty-icon::after { transform:translate(-50%,-50%) rotate(-45deg); }
/* ---- CTA banner ---- */
.cta-banner {
  position:relative; padding:100px 0;
  background:url('/assets/images/backpic/back-3.webp') center / cover no-repeat;
  overflow:hidden;
}
.cta-banner::before {
  content:''; position:absolute; inset:0;
  background:linear-gradient(90deg, rgba(5,13,31,0.96) 0%, rgba(5,13,31,0.78) 50%, rgba(15,34,64,0.65) 100%);
}
.cta-banner::after {
  content:''; position:absolute; width:380px; height:380px; border-radius:50%;
  background:radial-gradient(circle, rgba(0,229,255,0.12), transparent 70%);
  left:8%; bottom:-100px;
}
.cta-inner { position:relative; z-index:2; max-width:720px; margin:0 auto; text-align:center; }
.cta-inner h2 { font-size:32px; font-weight:900; line-height:1.3; margin-bottom:16px; }
.cta-inner p { color:var(--text-secondary); font-size:15px; line-height:1.8; margin-bottom:32px; }
.cta-btns { display:flex; justify-content:center; gap:16px; flex-wrap:wrap; }
/* ---- FAQ ---- */
.faq-wrapper { display:grid; grid-template-columns:0.85fr 1.15fr; gap:60px; align-items:start; }
.faq-side h2 { font-size:32px; font-weight:800; line-height:1.3; margin-bottom:14px; }
.faq-side p { color:var(--text-secondary); font-size:15px; line-height:1.8; margin-bottom:24px; }
.faq-list { display:flex; flex-direction:column; gap:14px; }
.faq-item {
  background:var(--glass-bg); border:1px solid var(--border-card);
  border-radius:var(--radius-sm); overflow:hidden;
  transition: border-color .3s, box-shadow .3s;
}
.faq-item.active { border-color:rgba(0,229,255,0.4); box-shadow:0 0 24px rgba(0,229,255,0.1); }
.faq-question {
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  width:100%; padding:20px 24px; text-align:left;
  font-size:15px; font-weight:600; color:var(--text-primary);
}
.faq-question .icon { font-size:20px; color:var(--text-muted); transition: transform .3s, color .3s; flex-shrink:0; font-weight:400; }
.faq-item.active .faq-question .icon { transform:rotate(45deg); color:var(--accent); }
.faq-answer { max-height:0; overflow:hidden; transition: max-height .35s ease; }
.faq-item.active .faq-answer { max-height:400px; }
.faq-answer p { padding:0 24px 22px; font-size:14px; color:var(--text-secondary); line-height:1.85; }
/* ---- Footer ---- */
.site-footer { background:#030A18; border-top:1px solid rgba(255,255,255,0.05); padding:72px 0 28px; }
.footer-grid { display:grid; grid-template-columns:1.4fr 1fr 1fr 1.2fr; gap:48px; margin-bottom:48px; }
.footer-brand .brand { margin-bottom:16px; font-size:17px; }
.footer-brand p { font-size:13px; color:var(--text-secondary); line-height:1.9; max-width:300px; }
.footer-col h4 { font-size:14px; font-weight:700; color:var(--text-primary); margin-bottom:16px; }
.footer-col ul { list-style:none; }
.footer-col ul li { margin-bottom:10px; }
.footer-col ul a { font-size:13px; color:var(--text-secondary); transition: color .2s; }
.footer-col ul a:hover { color:var(--accent); text-decoration:none; }
.footer-trust { display:flex; gap:16px; flex-wrap:wrap; padding:24px 0; border-top:1px solid rgba(255,255,255,0.05); border-bottom:1px solid rgba(255,255,255,0.05); margin-bottom:24px; }
.trust-badge { display:inline-flex; align-items:center; gap:8px; font-size:12px; color:var(--text-secondary); background:rgba(255,255,255,0.04); border:1px solid rgba(255,255,255,0.08); border-radius:999px; padding:6px 16px; }
.trust-badge svg { color:var(--accent); }
.footer-bottom { display:flex; justify-content:space-between; align-items:center; gap:16px; flex-wrap:wrap; }
.footer-bottom p { font-size:12px; color:var(--text-muted); }
.footer-bottom a { font-size:12px; color:var(--text-muted); }
.footer-bottom a:hover { color:var(--accent); }
/* ---- Responsive ---- */
@media (max-width:1024px) {
  .hero-inner { grid-template-columns:1fr; gap:48px; }
  .phone-wrap { display:none; }
  .check-grid { grid-template-columns:repeat(2,1fr); }
  .faq-wrapper { grid-template-columns:1fr; gap:36px; }
  .footer-grid { grid-template-columns:1fr 1fr; gap:36px; }
  .news-item { grid-template-columns:120px 1fr; gap:16px; }
  .news-thumb { width:120px; height:86px; }
}
@media (max-width:767px) {
  .section { --section-pad: 64px; }
  .container { padding:0 20px; }
  .site-header .nav-links { display:none; }
  .site-header .search-box { display:none; }
  .site-header .icon-btn { display:flex; }
  .menu-toggle { display:flex; }
  .header-login-btn { padding:8px 16px; font-size:13px; }
  .brand { font-size:15px; gap:7px; }
  .brand svg { width:26px; height:26px; }
  .hero { min-height:0; padding:110px 0 56px; }
  .hero h1 { font-size:28px; }
  .hero-lead { font-size:14px; }
  .hero-ctas .btn { flex:1; min-width:140px; }
  .hero-trust { gap:16px; }
  .section-title { font-size:22px; }
  .section-sub { font-size:14px; }
  .clip-card { min-width:200px; width:200px; }
  .check-grid { grid-template-columns:1fr; }
  .check-card { padding:22px 20px; }
  .rating-head { flex-direction:column; align-items:flex-start; gap:18px; }
  .bubble { min-width:220px; }
  .news-item { grid-template-columns:100px 1fr; gap:12px; padding:14px 14px; }
  .news-thumb { width:100px; height:78px; border-radius:12px; }
  .news-title { font-size:15px; white-space:normal; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; }
  .news-summary { -webkit-line-clamp:2; }
  .news-meta { flex-wrap:wrap; gap:8px; }
  .cta-banner { padding:72px 0; }
  .cta-inner h2 { font-size:22px; }
  .cta-btns .btn { flex:1; min-width:140px; }
  .faq-question { font-size:14px; padding:16px 18px; }
  .faq-answer p { padding:0 18px 18px; }
  .footer-grid { grid-template-columns:1fr; gap:28px; }
  .footer-bottom { flex-direction:column; align-items:flex-start; }
}
@media (max-width:520px) {
  .hero-ctas { flex-direction:column; }
  .hero-ctas .btn { width:100%; }
  .cta-btns { flex-direction:column; }
  .cta-btns .btn { width:100%; }
  .section-title { font-size:20px; }
}

/* roulang page: category1 */
:root {
            --bg-primary: #050D1F;
            --bg-secondary: #0A1830;
            --bg-deep: #0F2240;
            --glass-bg: rgba(12, 25, 52, 0.66);
            --accent: #00E5FF;
            --accent-blue: #3D7BFF;
            --accent-pink: #FF5C8A;
            --accent-amber: #FFD166;
            --text-primary: #EAF4FF;
            --text-secondary: #94ABC8;
            --text-weak: #5E7799;
            --text-invert: #0B1B33;
            --border: rgba(255, 255, 255, 0.10);
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-sm: 12px;
            --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
            --glow: 0 0 28px rgba(0, 229, 255, 0.35);
            --transition: all .3s ease;
            --container: 1280px;
            --spacing: 96px;
            --font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-primary);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
            border-radius: var(--radius-md);
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            text-decoration: underline;
            text-underline-offset: 4px;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            color: inherit;
        }
        input {
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
            color: var(--text-primary);
        }
        input::placeholder {
            color: var(--text-weak);
        }
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 32px;
        }
        .section {
            padding: var(--spacing) 0;
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 700;
            color: var(--accent);
            background: rgba(0, 229, 255, 0.10);
            border: 1px solid rgba(0, 229, 255, 0.25);
            border-radius: 999px;
            padding: 5px 14px;
            letter-spacing: .3px;
            margin-bottom: 18px;
        }
        .section-head {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 52px;
        }
        .section-head h2 {
            font-size: 32px;
            font-weight: 900;
            line-height: 1.3;
            letter-spacing: -.5px;
            color: var(--text-primary);
        }
        .section-head p {
            color: var(--text-secondary);
            font-size: 15px;
            margin-top: 14px;
            line-height: 1.8;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 999px;
            font-weight: 700;
            font-size: 15px;
            padding: 12px 28px;
            min-height: 44px;
            transition: var(--transition);
            text-decoration: none;
            border: 1px solid transparent;
            line-height: 1.4;
            white-space: nowrap;
        }
        .btn:hover {
            text-decoration: none;
            transform: translateY(-2px);
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-blue) 100%);
            color: var(--text-invert);
            box-shadow: var(--glow);
        }
        .btn-primary:hover {
            box-shadow: 0 0 40px rgba(0, 229, 255, 0.55);
            color: var(--text-invert);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.30);
        }
        .btn-ghost {
            background: rgba(255, 255, 255, 0.04);
            border-color: rgba(255, 255, 255, 0.16);
            color: var(--text-primary);
        }
        .btn-ghost:hover {
            border-color: rgba(0, 229, 255, 0.5);
            color: var(--accent);
            background: rgba(0, 229, 255, 0.06);
        }
        .btn-ghost-light {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.28);
            color: #fff;
        }
        .btn-ghost-light:hover {
            background: rgba(255, 255, 255, 0.14);
            border-color: var(--accent);
            color: var(--accent);
        }
        .btn-lg {
            padding: 15px 38px;
            font-size: 16px;
        }
        .btn-sm {
            padding: 8px 22px;
            font-size: 14px;
            min-height: 38px;
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 68px;
            z-index: 1000;
            background: rgba(5, 13, 31, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            height: 68px;
            gap: 28px;
            justify-content: space-between;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-primary);
            font-weight: 800;
            font-size: 17px;
            text-decoration: none;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .brand:hover {
            text-decoration: none;
            color: var(--text-primary);
        }
        .brand svg {
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 30px;
            margin: 0 auto;
        }
        .nav-links a {
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            padding: 6px 0;
            position: relative;
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: #fff;
        }
        .nav-links a.active {
            color: var(--accent);
            font-weight: 700;
        }
        .nav-links a.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            border-radius: 2px;
            background: var(--accent);
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.7);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 999px;
            padding: 8px 16px;
            width: 200px;
            transition: var(--transition);
        }
        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15);
        }
        .search-box svg {
            flex-shrink: 0;
            opacity: .7;
        }
        .search-box input {
            flex: 1;
            font-size: 13px;
            color: var(--text-primary);
        }
        .btn-login {
            border-radius: 999px;
            padding: 8px 16px;
            font-size: 14px;
            color: var(--text-secondary);
            border: 1px solid rgba(255, 255, 255, 0.10);
            background: transparent;
            min-height: 38px;
        }
        .btn-login:hover {
            color: var(--text-primary);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
        }
        .mobile-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            border-radius: 2px;
            background: var(--text-primary);
            transition: var(--transition);
        }
        .mobile-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .mobile-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .mobile-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(8, 18, 38, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 24px 28px;
            flex-direction: column;
            gap: 8px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            color: var(--text-secondary);
            padding: 12px 8px;
            font-size: 16px;
            border-radius: 10px;
            text-decoration: none;
        }
        .mobile-menu a:hover {
            background: rgba(255, 255, 255, 0.04);
            color: #fff;
        }
        .mobile-menu a.active {
            color: var(--accent);
            font-weight: 700;
        }
        .mobile-menu .mobile-search {
            margin: 12px 0 8px;
            display: flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 999px;
            padding: 10px 18px;
        }
        .mobile-menu .mobile-search input {
            flex: 1;
            font-size: 14px;
        }
        .mobile-menu .btn {
            width: 100%;
            margin-top: 8px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 160px 0 90px;
            background:
                linear-gradient(120deg, rgba(5, 13, 31, 0.96) 0%, rgba(8, 20, 42, 0.82) 55%, rgba(5, 13, 31, 0.60) 100%),
                url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            overflow: hidden;
        }
        .hero::after {
            content: "";
            position: absolute;
            right: -80px;
            top: 80px;
            width: 480px;
            height: 480px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.12) 0%, transparent 65%);
            pointer-events: none;
            z-index: 0;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 56px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 24px;
        }
        .mini-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.10);
            border-radius: 999px;
            padding: 7px 16px;
            font-size: 13px;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .mini-badge .dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--accent);
            box-shadow: 0 0 8px var(--accent);
            flex-shrink: 0;
        }
        .hero-copy h1 {
            font-size: 44px;
            font-weight: 900;
            line-height: 1.2;
            color: var(--text-primary);
            letter-spacing: -1px;
            margin-bottom: 18px;
        }
        .hero-sub {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.9;
            max-width: 520px;
            margin-bottom: 30px;
        }
        .hero-cta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        /* Phone frame */
        .hero-visual {
            display: flex;
            justify-content: center;
            position: relative;
            z-index: 2;
        }
        .phone-frame {
            width: 300px;
            height: 520px;
            border-radius: 24px;
            border: 2px solid rgba(255, 255, 255, 0.18);
            background: rgba(255, 255, 255, 0.02);
            box-shadow: 0 32px 80px rgba(0, 0, 0, 0.55), 0 0 60px rgba(0, 229, 255, 0.08);
            padding: 10px;
            position: relative;
        }
        .phone-screen {
            position: relative;
            width: 100%;
            height: 100%;
            border-radius: 16px;
            object-fit: cover;
            background-size: cover;
            background-position: center;
            overflow: hidden;
        }
        .phone-gradient {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(5, 13, 31, 0.15) 0%, rgba(5, 13, 31, 0.55) 55%, rgba(5, 13, 31, 0.82) 100%);
            border-radius: 16px;
        }
        .phone-live {
            position: absolute;
            top: 14px;
            left: 14px;
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: rgba(5, 13, 31, 0.55);
            backdrop-filter: blur(8px);
            border-radius: 999px;
            padding: 6px 14px;
            font-size: 12px;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .phone-live .live-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--accent-pink);
            box-shadow: 0 0 8px var(--accent-pink);
        }
        .phone-card {
            position: absolute;
            bottom: 74px;
            left: 16px;
            right: 16px;
            background: rgba(12, 25, 52, 0.66);
            backdrop-filter: blur(14px);
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            padding: 18px;
            font-weight: 800;
            font-size: 16px;
            color: var(--text-primary);
            box-shadow: var(--shadow);
        }
        .phone-card span {
            display: block;
            font-weight: 400;
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        .phone-actions {
            position: absolute;
            right: 14px;
            bottom: 130px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            z-index: 3;
        }
        .phone-action {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            background: rgba(5, 13, 31, 0.55);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 999px;
            padding: 8px 12px;
            font-size: 11px;
            color: #fff;
            min-width: 52px;
            text-align: center;
            backdrop-filter: blur(6px);
        }
        .phone-action i {
            width: 16px;
            height: 16px;
            border-radius: 4px;
            display: inline-block;
        }
        .act-heart {
            background: var(--accent-pink);
        }
        .act-chat {
            background: var(--accent);
        }
        .act-share {
            background: var(--accent-amber);
        }
        .phone-progress {
            position: absolute;
            bottom: 28px;
            left: 16px;
            right: 16px;
            height: 4px;
            background: rgba(255, 255, 255, 0.18);
            border-radius: 2px;
            overflow: hidden;
        }
        .phone-progress i {
            display: block;
            width: 45%;
            height: 100%;
            background: var(--accent);
            border-radius: 2px;
            box-shadow: 0 0 8px var(--accent);
        }

        /* ===== Tools Section ===== */
        .tools-section {
            background: var(--bg-secondary);
            position: relative;
        }
        .tools-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .tool-card {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 26px;
            position: relative;
            transition: var(--transition);
            overflow: hidden;
            backdrop-filter: blur(14px);
        }
        .tool-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), transparent);
            opacity: 0.6;
            transition: var(--transition);
        }
        .tool-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 229, 255, 0.35);
            box-shadow: 0 20px 48px rgba(0, 0, 0, 0.45);
        }
        .tool-num {
            font-size: 48px;
            font-weight: 900;
            line-height: 1;
            color: transparent;
            -webkit-text-stroke: 1px rgba(0, 229, 255, 0.35);
            margin-bottom: 22px;
        }
        .tool-card h3 {
            font-size: 19px;
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .tool-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 18px;
            flex: 1;
        }
        .tool-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 700;
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        .tool-link:hover {
            text-decoration: none;
            transform: translateX(4px);
            color: #fff;
        }

        /* ===== Prep Section ===== */
        .prep-section {
            background: var(--bg-primary);
        }
        .prep-inner {
            display: grid;
            grid-template-columns: 0.95fr 1.05fr;
            gap: 64px;
            align-items: center;
        }
        .prep-image {
            position: relative;
        }
        .prep-image img {
            width: 100%;
            height: 420px;
            object-fit: cover;
            border-radius: 24px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
        }
        .prep-floating-card {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(12, 25, 52, 0.80);
            backdrop-filter: blur(12px);
            border-radius: var(--radius-md);
            border: 1px solid rgba(0, 229, 255, 0.28);
            padding: 14px 20px;
            font-size: 13px;
            color: var(--text-primary);
            box-shadow: var(--shadow);
        }
        .prep-content h2 {
            font-size: 32px;
            font-weight: 900;
            line-height: 1.3;
            margin-bottom: 14px;
        }
        .prep-intro {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 26px;
        }
        .prep-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .prep-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            background: rgba(255, 255, 255, 0.028);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            padding: 14px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            transition: var(--transition);
        }
        .prep-list li:hover {
            border-color: rgba(0, 229, 255, 0.2);
            background: rgba(0, 229, 255, 0.02);
        }
        .check-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.12);
            border: 1px solid rgba(0, 229, 255, 0.3);
            position: relative;
            margin-top: 3px;
        }
        .check-icon::after {
            content: "";
            position: absolute;
            left: 6px;
            top: 3px;
            width: 5px;
            height: 10px;
            border: solid var(--accent);
            border-width: 0 2px 2px 0;
            transform: rotate(45deg);
        }

        /* ===== Steps Section ===== */
        .steps-section {
            background: var(--bg-secondary);
        }
        .steps-timeline {
            max-width: 760px;
            margin: 0 auto;
            position: relative;
            padding-left: 60px;
        }
        .steps-timeline::before {
            content: "";
            position: absolute;
            left: 20px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: linear-gradient(180deg, var(--accent), rgba(0, 229, 255, 0.05));
            border-radius: 2px;
        }
        .step-item {
            position: relative;
            margin-bottom: 40px;
        }
        .step-item:last-child {
            margin-bottom: 0;
        }
        .step-marker {
            position: absolute;
            left: -50px;
            top: 4px;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg-deep);
            border: 2px solid var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 800;
            color: var(--accent);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.2);
            z-index: 2;
        }
        .step-content {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 30px;
            transition: var(--transition);
        }
        .step-content:hover {
            border-color: rgba(0, 229, 255, 0.25);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }
        .step-content h3 {
            font-size: 18px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .step-content p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            background: var(--bg-primary);
        }
        .faq-layout {
            display: grid;
            grid-template-columns: 0.8fr 1.2fr;
            gap: 56px;
            align-items: start;
        }
        .faq-intro {
            position: sticky;
            top: 96px;
        }
        .faq-intro h2 {
            font-size: 32px;
            font-weight: 900;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .faq-intro p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.85;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
            backdrop-filter: blur(10px);
        }
        .faq-item.open {
            border-color: rgba(0, 229, 255, 0.35);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.06);
        }
        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 20px 22px;
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            text-align: left;
            line-height: 1.5;
            gap: 16px;
        }
        .faq-q:hover {
            color: var(--accent);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 500;
            color: var(--accent);
            transition: transform .3s ease;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease, padding .35s ease;
            padding: 0 22px;
        }
        .faq-item.open .faq-a {
            max-height: 200px;
            padding: 0 22px 20px;
        }
        .faq-a p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.85;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            position: relative;
            padding: 90px 0;
            background:
                linear-gradient(180deg, rgba(5, 13, 31, 0.92) 0%, rgba(5, 13, 31, 0.78) 100%),
                url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
            text-align: center;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 560px;
            height: 560px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.10) 0%, transparent 65%);
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }
        .cta-inner h2 {
            font-size: 32px;
            font-weight: 900;
            line-height: 1.35;
            margin-bottom: 14px;
        }
        .cta-inner p {
            color: var(--text-secondary);
            font-size: 16px;
            margin-bottom: 30px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #030A18;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 64px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand .brand {
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.85;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul a {
            color: var(--text-secondary);
            font-size: 14px;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-col ul a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-col p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.9;
        }
        .footer-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            padding: 24px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            margin-bottom: 24px;
        }
        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.07);
            border-radius: 999px;
            padding: 8px 16px;
        }
        .trust-badge svg {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 13px;
            color: var(--text-weak);
        }
        .footer-bottom a {
            color: var(--text-weak);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }
            .tools-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-inner {
                grid-template-columns: 1fr 0.7fr;
                gap: 36px;
            }
            .phone-frame {
                width: 250px;
                height: 440px;
            }
            .nav-links {
                gap: 18px;
            }
            .search-box {
                width: 150px;
            }
        }
        @media (max-width: 767px) {
            .section {
                --spacing: 64px;
                padding: 64px 0;
            }
            .container {
                padding: 0 20px;
            }
            .nav-links,
            .nav-actions .search-box,
            .nav-actions .btn-login,
            .nav-actions .btn-primary {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .hero {
                padding: 120px 0 60px;
            }
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-copy h1 {
                font-size: 28px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .phone-frame {
                width: 240px;
                height: 420px;
            }
            .tools-grid {
                grid-template-columns: 1fr;
            }
            .prep-inner {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .prep-image img {
                height: 260px;
            }
            .steps-timeline {
                padding-left: 44px;
            }
            .step-marker {
                left: -42px;
                width: 34px;
                height: 34px;
                font-size: 14px;
            }
            .faq-layout {
                grid-template-columns: 1fr;
            }
            .faq-intro {
                position: static;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .cta-buttons .btn {
                width: 100%;
                max-width: 320px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .hero-copy h1 {
                font-size: 26px;
            }
            .tool-card {
                padding: 24px 20px;
            }
            .section-head h2 {
                font-size: 24px;
            }
            .cta-inner h2 {
                font-size: 24px;
            }
            .prep-floating-card {
                font-size: 12px;
                left: 10px;
                bottom: 10px;
                padding: 10px 14px;
            }
        }

/* roulang page: article */
:root {
  --bg-primary: #050D1F;
  --bg-secondary: #0A1830;
  --bg-deep: #0F2240;
  --bg-darker: #030A18;
  --accent: #00E5FF;
  --accent-blue: #3D7BFF;
  --accent-pink: #FF5C8A;
  --accent-amber: #FFD166;
  --text-main: #EAF4FF;
  --text-secondary: #94ABC8;
  --text-weak: #5E7799;
  --text-inverse: #0B1B33;
  --border-light: rgba(255,255,255,0.10);
  --border-accent: rgba(0,229,255,0.35);
  --radius-card: 20px;
  --radius-small: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 16px 40px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 28px rgba(0,229,255,0.35);
  --container: 1280px;
  --space-section: 96px;
  --space-section-mobile: 64px;
  --header-height: 68px;
  --font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
body.no-scroll { overflow: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }
ul, ol { list-style: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 14px;
  min-height: 44px;
  padding: 0 24px;
  transition: all .22s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent));
  color: var(--text-inverse);
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 40px rgba(0,229,255,0.55);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(1px); }
.btn-lg { padding: 0 36px; font-size: 16px; min-height: 50px; }
.btn-ghost {
  background: rgba(255,255,255,0.06);
  color: var(--text-main);
  border-color: rgba(255,255,255,0.18);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 20px rgba(0,229,255,0.15); }
.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border-light);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 16px rgba(0,229,255,0.12); }

/* ===== 导航栏 ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(5,13,31,0.82);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--text-main);
  white-space: nowrap;
  letter-spacing: .5px;
}
.brand svg { flex-shrink: 0; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: 24px;
  flex: 1;
}
.nav-links a {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 6px 2px;
  transition: color .2s ease;
}
.nav-links a:hover { color: var(--text-main); }
.nav-links a.active { color: var(--accent); font-weight: 600; }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--accent);
  box-shadow: var(--shadow-glow);
  border-radius: 2px;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-pill);
  padding: 0 14px;
  height: 38px;
  width: 200px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,229,255,0.15);
}
.search-box svg { width: 16px; height: 16px; color: var(--text-weak); flex-shrink: 0; }
.search-box input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 14px;
  width: 100%;
}
.search-box input::placeholder { color: var(--text-weak); }
.btn-login-icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  border: 1px solid rgba(255,255,255,0.12);
  transition: all .2s ease;
}
.btn-login-icon:hover { color: var(--accent); border-color: var(--accent); }
.mobile-search { display: none; }
.menu-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: var(--text-main);
  border: 1px solid rgba(255,255,255,0.1);
}
.menu-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* ===== 文章页头 ===== */
.article-hero {
  padding: calc(var(--header-height) + 48px) 0 52px;
  background:
    linear-gradient(180deg, rgba(5,13,31,0.88) 0%, var(--bg-primary) 100%),
    url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.breadcrumb {
  margin-bottom: 24px;
  overflow-x: auto;
  white-space: nowrap;
}
.breadcrumb ol { display: flex; align-items: center; font-size: 13px; color: var(--text-weak); }
.breadcrumb li { display: flex; align-items: center; flex-shrink: 0; }
.breadcrumb li:not(:last-child)::after {
  content: '›';
  margin: 0 10px;
  color: var(--text-weak);
  font-size: 16px;
  line-height: 1;
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb li[aria-current="page"] {
  color: var(--text-main);
  max-width: 420px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.article-hero h1 {
  font-size: 44px;
  line-height: 1.2;
  font-weight: 800;
  max-width: 880px;
  margin-bottom: 22px;
  letter-spacing: .5px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  color: var(--text-secondary);
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.meta-item svg {
  width: 15px;
  height: 15px;
  color: var(--text-weak);
  flex-shrink: 0;
}

/* ===== 正文区域 ===== */
.article-section {
  padding: 56px 0 72px;
}
.article-container {
  max-width: 860px;
  margin: 0 auto;
}
.article-body {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-main);
  word-break: break-word;
}
.article-body h2 {
  font-size: 28px;
  font-weight: 800;
  margin: 48px 0 20px;
  line-height: 1.35;
  letter-spacing: .3px;
}
.article-body h3 {
  font-size: 22px;
  font-weight: 700;
  margin: 36px 0 16px;
  line-height: 1.4;
}
.article-body h4 {
  font-size: 18px;
  font-weight: 700;
  margin: 28px 0 12px;
}
.article-body p { margin: 16px 0; }
.article-body a { color: var(--accent); }
.article-body a:hover { text-decoration: underline; text-underline-offset: 4px; }
.article-body img {
  border-radius: var(--radius-small);
  margin: 28px auto;
  background: var(--bg-secondary);
}
.article-body blockquote {
  border-left: 4px solid var(--accent);
  background: rgba(0,229,255,0.05);
  padding: 16px 22px;
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
  margin: 24px 0;
  color: var(--text-secondary);
  font-size: 15px;
}
.article-body blockquote p { margin: 4px 0; }
.article-body ul, .article-body ol { margin: 16px 0; padding-left: 24px; }
.article-body ul li { list-style: disc; margin: 8px 0; }
.article-body ol li { list-style: decimal; margin: 8px 0; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}
.article-body th, .article-body td {
  border: 1px solid var(--border-light);
  padding: 12px 16px;
  text-align: left;
}
.article-body th {
  background: var(--bg-secondary);
  color: var(--accent);
  font-weight: 700;
}
.article-body code {
  background: rgba(0,229,255,0.08);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: .9em;
  color: var(--accent);
  word-break: break-all;
}
.article-body pre {
  background: var(--bg-deep);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-small);
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
  line-height: 1.7;
}
.article-body pre code { background: none; padding: 0; color: var(--text-main); }
.article-body hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 40px 0;
}

/* ===== 文章底部 ===== */
.article-foot {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,229,255,0.12);
  color: var(--accent);
  border-radius: var(--radius-pill);
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 500;
}
.article-share {
  display: flex;
  align-items: center;
  gap: 8px;
}
.share-label {
  font-size: 13px;
  color: var(--text-weak);
  margin-right: 4px;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all .2s ease;
}
.share-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px rgba(0,229,255,0.12);
}
.share-btn svg { width: 14px; height: 14px; }

/* ===== 空态 ===== */
.article-empty {
  text-align: center;
  padding: 80px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
}
.empty-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.05);
  color: var(--text-weak);
}
.empty-icon svg { width: 34px; height: 34px; }
.article-empty p { font-size: 20px; font-weight: 700; }
.article-empty .empty-sub {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 400;
  margin: 10px 0 28px;
}

/* ===== 相关推荐 ===== */
.related-section {
  padding: 72px 0 64px;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.04);
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
}
.section-head p {
  color: var(--text-secondary);
  font-size: 14px;
  max-width: 360px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.related-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-card);
}
.related-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-deep);
  overflow: hidden;
}
.related-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.related-card:hover .related-cover img { transform: scale(1.03); }
.badge {
  position: absolute;
  top: 14px;
  left: 14px;
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-inverse);
}
.badge-pink { background: var(--accent-pink); }
.badge-amber { background: var(--accent-amber); }
.related-body {
  padding: 20px 22px 22px;
}
.related-body h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}
.related-body h3 a:hover { color: var(--accent); }
.related-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-weak);
}

/* ===== 返回入口 ===== */
.article-actions {
  padding: 40px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.article-actions .container {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ===== CTA 横幅 ===== */
.cta-section {
  padding: 64px 0;
}
.cta-box {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  padding: 64px 40px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.1);
  background: var(--bg-deep);
}
.cta-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .35;
  z-index: 0;
}
.cta-box::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,13,31,0.6) 0%, rgba(5,13,31,0.88) 100%);
  z-index: 0;
}
.cta-box h2,
.cta-box p,
.cta-box .cta-buttons {
  position: relative;
  z-index: 1;
}
.cta-box h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 14px;
}
.cta-box p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 520px;
  margin: 0 auto 28px;
}
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-darker);
  padding-top: 64px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand .brand {
  font-size: 20px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.footer-brand p {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 340px;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text-main);
}
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 2.3;
}
.footer-col ul li a:hover { color: var(--accent); }
.footer-col p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.9;
}
.footer-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.trust-badge {
  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 rgba(255,255,255,0.08);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}
.trust-badge svg { color: var(--accent); }
.footer-bottom {
  padding: 24px 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-weak);
}

/* ===== 平板断点 ===== */
@media (max-width: 1023px) {
  .nav-links { gap: 18px; margin-left: 16px; }
  .search-box { width: 150px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 767px) {
  .header-inner { padding: 0 20px; gap: 10px; }
  .brand { font-size: 16px; }
  .brand svg { width: 22px; height: 22px; }
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0; right: 0;
    background: rgba(5,13,31,0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 4px;
    padding: 20px;
    margin: 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    display: none;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 4px; font-size: 16px; border-bottom: 1px solid rgba(255,255,255,0.05); }
  .nav-links a.active::after { display: none; }
  .nav-links a.active { color: var(--accent); }
  .search-box { display: none; }
  .mobile-search {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-pill);
    padding: 0 14px;
    height: 42px;
    margin-top: 10px;
    transition: border-color .2s ease, box-shadow .2s ease;
  }
  .mobile-search:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0,229,255,0.15);
  }
  .mobile-search svg { width: 16px; height: 16px; color: var(--text-weak); flex-shrink: 0; }
  .mobile-search input {
    background: none;
    border: none;
    outline: none;
    color: var(--text-main);
    font-size: 14px;
    width: 100%;
  }
  .mobile-search input::placeholder { color: var(--text-weak); }
  .btn-login-icon { display: none; }
  .btn-primary { padding: 0 18px; font-size: 13px; min-height: 40px; }
  .menu-toggle { display: flex; }
  .article-hero {
    padding: calc(var(--header-height) + 32px) 0 40px;
  }
  .article-hero h1 {
    font-size: 28px;
    line-height: 1.25;
    margin-bottom: 18px;
  }
  .article-meta { gap: 12px; font-size: 13px; }
  .article-container { max-width: 100%; }
  .article-section { padding: 36px 0 48px; }
  .article-body { font-size: 16px; line-height: 1.85; }
  .article-body h2 { font-size: 23px; margin: 36px 0 16px; }
  .article-body h3 { font-size: 20px; margin: 28px 0 12px; }
  .article-foot { flex-direction: column; align-items: flex-start; }
  .related-section { padding: 48px 0 40px; }
  .section-head h2 { font-size: 24px; }
  .related-grid { grid-template-columns: 1fr; gap: 16px; }
  .related-body h3 { font-size: 16px; }
  .article-actions { padding: 24px 0; }
  .article-actions .container { flex-direction: column; align-items: stretch; }
  .cta-section { padding: 40px 0; }
  .cta-box { padding: 48px 24px; }
  .cta-box h2 { font-size: 26px; }
  .cta-buttons { flex-direction: column; align-items: stretch; }
  .cta-buttons .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; justify-content: center; text-align: center; }
}
@media (max-width: 520px) {
  .container { padding: 0 20px; }
  .brand span { font-size: 15px; }
  .article-hero h1 { font-size: 25px; }
  .related-meta { flex-direction: column; align-items: flex-start; gap: 4px; }
}

/* roulang page: category2 */
:root {
            --bg-dark: #050D1F;
            --bg-mid: #0A1830;
            --bg-deep: #030A18;
            --glass-bg: rgba(12, 25, 52, 0.66);
            --primary: #00E5FF;
            --secondary: #3D7BFF;
            --accent: #FF5C8A;
            --warm: #FFD166;
            --text-main: #EAF4FF;
            --text-secondary: #94ABC8;
            --text-weak: #5E7799;
            --text-invert: #0B1B33;
            --border: rgba(255, 255, 255, 0.10);
            --border-bright: rgba(0, 229, 255, 0.35);
            --radius-card: 20px;
            --radius-small: 16px;
            --radius-input: 14px;
            --shadow-card: 0 16px 40px rgba(0, 0, 0, 0.35);
            --shadow-glow: 0 0 28px rgba(0, 229, 255, 0.35);
            --font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --nav-height: 68px;
            --container: 1280px;
            --pad-desktop: 32px;
            --pad-mobile: 20px;
            --section-gap: 96px;
            --section-gap-mobile: 64px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-family);
            background: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }
        img {
            max-width: 100%;
            display: block;
            border-radius: var(--radius-small);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .25s ease;
        }
        a:hover {
            text-decoration: underline;
            text-underline-offset: 4px;
            text-decoration-color: rgba(0, 229, 255, 0.6);
        }
        button {
            font-family: var(--font-family);
            cursor: pointer;
        }
        input {
            font-family: var(--font-family);
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 var(--pad-desktop);
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: rgba(5, 13, 31, 0.82);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            z-index: 1000;
        }
        .nav-inner {
            max-width: var(--container);
            margin: 0 auto;
            height: var(--nav-height);
            padding: 0 var(--pad-desktop);
            display: flex;
            align-items: center;
            gap: 20px;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 17px;
            letter-spacing: .02em;
            color: var(--text-main);
            white-space: nowrap;
            text-decoration: none;
            min-width: 220px;
        }
        .brand:hover {
            text-decoration: none;
        }
        .brand svg {
            flex-shrink: 0;
            width: 26px;
            height: 26px;
        }
        .nav-links {
            display: flex;
            gap: 4px;
            margin-left: auto;
            align-items: center;
        }
        .nav-links a {
            display: inline-block;
            padding: 10px 16px;
            border-radius: 999px;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            position: relative;
            transition: color .25s ease, background .25s ease;
        }
        .nav-links a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.05);
            text-decoration: none;
        }
        .nav-links a.active {
            color: var(--primary);
            background: rgba(0, 229, 255, 0.06);
            font-weight: 600;
        }
        .nav-links a.active::after {
            content: "";
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 18px;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
            box-shadow: 0 0 8px rgba(0, 229, 255, 0.6);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: 8px;
            flex-shrink: 0;
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 999px;
            padding: 0 8px 0 14px;
            height: 38px;
            width: 190px;
            transition: border-color .25s, box-shadow .25s;
        }
        .nav-search svg {
            width: 15px;
            height: 15px;
            color: var(--text-weak);
            margin-right: 6px;
            flex-shrink: 0;
        }
        .nav-search input {
            background: transparent;
            border: none;
            outline: none;
            color: var(--text-main);
            font-size: 13px;
            width: 100%;
        }
        .nav-search input::placeholder {
            color: var(--text-weak);
        }
        .nav-search:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15);
        }
        .nav-icon-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            border: 1px solid var(--border);
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-main);
            transition: border-color .25s, background .25s, box-shadow .25s;
        }
        .nav-icon-btn:hover {
            border-color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.18);
        }
        .nav-icon-btn svg {
            width: 16px;
            height: 16px;
        }
        .nav-divider {
            width: 1px;
            height: 20px;
            background: rgba(255, 255, 255, 0.12);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 999px;
            padding: 12px 26px;
            border: 1px solid transparent;
            transition: all .25s ease;
            text-decoration: none;
            cursor: pointer;
            min-height: 44px;
            background: transparent;
            color: var(--text-main);
        }
        .btn:hover {
            text-decoration: none;
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            color: var(--text-invert);
            box-shadow: var(--shadow-glow);
            font-weight: 700;
        }
        .btn-primary:hover {
            box-shadow: 0 0 38px rgba(0, 229, 255, 0.55);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 0 18px rgba(0, 229, 255, 0.3);
        }
        .btn-ghost {
            border-color: rgba(0, 229, 255, 0.4);
            color: var(--primary);
            background: rgba(0, 229, 255, 0.05);
        }
        .btn-ghost:hover {
            background: rgba(0, 229, 255, 0.12);
            border-color: var(--primary);
            box-shadow: 0 0 18px rgba(0, 229, 255, 0.15);
        }
        .btn-sm {
            padding: 8px 18px;
            min-height: 38px;
            font-size: 13px;
        }
        .menu-btn {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: rgba(255, 255, 255, 0.04);
            align-items: center;
            justify-content: center;
        }
        .menu-btn svg {
            width: 20px;
            height: 20px;
            color: var(--text-main);
        }

        /* Mobile nav dropdown */
        .mobile-nav {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: rgba(10, 24, 48, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            padding: 16px 20px 24px;
            z-index: 999;
            flex-direction: column;
            gap: 8px;
        }
        .mobile-nav.show {
            display: flex;
        }
        .mobile-nav a {
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            padding: 12px 14px;
            border-radius: 12px;
            text-decoration: none;
        }
        .mobile-nav a:hover {
            color: var(--text-main);
            background: rgba(255, 255, 255, 0.05);
        }
        .mobile-nav a.active-mobile {
            color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
        }
        .mobile-nav .btn {
            margin-top: 10px;
            width: 100%;
        }

        /* Hero */
        .hero {
            position: relative;
            min-height: 600px;
            display: flex;
            align-items: center;
            padding: calc(var(--nav-height) + 40px) 0 48px;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            overflow: hidden;
        }
        .hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(5, 13, 31, 0.92) 0%, rgba(5, 13, 31, 0.75) 55%, rgba(10, 24, 48, 0.45) 100%);
            z-index: 1;
        }
        .hero-glow {
            position: absolute;
            top: 50%;
            right: -80px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.15) 0%, transparent 70%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content {
            max-width: 580px;
        }
        .hero-badge-line {
            display: flex;
            gap: 10px;
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: 999px;
            font-size: 12px;
            color: var(--text-main);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .hero-badge .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 0 0 6px var(--primary);
        }
        .hero h1 {
            font-size: 44px;
            font-weight: 900;
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            color: var(--text-main);
        }
        .hero-sub {
            font-size: 17px;
            color: var(--text-secondary);
            margin-bottom: 30px;
            line-height: 1.8;
            max-width: 480px;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-metrics {
            display: flex;
            gap: 28px;
            margin-top: 36px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
        }
        .hero-metric {
            text-align: left;
        }
        .hero-metric .value {
            display: block;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
        }
        .hero-metric .label {
            font-size: 12px;
            color: var(--text-weak);
            margin-top: 2px;
        }

        /* Hero right panel */
        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .security-panel {
            width: 330px;
            border-radius: 24px;
            background: var(--glass-bg);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border);
            padding: 28px;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .security-panel::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 160px;
            height: 160px;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.22), transparent 70%);
            border-radius: 50%;
        }
        .security-panel .panel-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
        }
        .security-panel .panel-shield {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-invert);
        }
        .security-panel .panel-shield svg {
            width: 22px;
            height: 22px;
        }
        .security-panel .panel-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
        }
        .security-panel .panel-sub {
            font-size: 12px;
            color: var(--text-weak);
        }
        .security-check-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-bottom: 22px;
        }
        .security-check-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--text-secondary);
        }
        .security-check-item .check-icon {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            flex-shrink: 0;
        }
        .security-check-item .check-icon svg {
            width: 11px;
            height: 11px;
        }
        .security-panel .panel-status {
            border-radius: 14px;
            background: rgba(0, 229, 255, 0.06);
            border: 1px solid rgba(0, 229, 255, 0.2);
            padding: 14px 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .security-panel .panel-status .pulse {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.15), 0 0 10px var(--primary);
            flex-shrink: 0;
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.6;
                transform: scale(0.9);
            }
        }
        .security-panel .panel-status span {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-main);
        }

        /* Sections base */
        .section {
            padding: var(--section-gap) 0;
        }
        .section-mid-bg {
            background: var(--bg-mid);
        }
        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 56px;
        }
        .section-head h2 {
            font-size: 32px;
            font-weight: 900;
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .section-head p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .section-head .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
            padding: 5px 14px;
            border-radius: 999px;
            margin-bottom: 16px;
        }

        /* Defense cards */
        .defense-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .defense-card {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 32px 24px;
            transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
        }
        .defense-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-bright);
            box-shadow: var(--shadow-card);
        }
        .defense-icon {
            width: 46px;
            height: 46px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(61, 123, 255, 0.2), rgba(0, 229, 255, 0.15));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            color: var(--primary);
        }
        .defense-icon svg {
            width: 22px;
            height: 22px;
        }
        .defense-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }
        .defense-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Secure layout */
        .secure-section {
            padding: var(--section-gap) 0;
            background:
                radial-gradient(ellipse at 30% 20%, rgba(0, 229, 255, 0.05), transparent 50%),
                linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-mid) 100%);
        }
        .secure-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 52px;
        }
        .secure-head h2 {
            font-size: 32px;
            font-weight: 900;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .secure-head p {
            font-size: 15px;
            color: var(--text-secondary);
        }
        .secure-layout {
            display: grid;
            grid-template-columns: 250px 1fr;
            gap: 40px;
            align-items: start;
        }
        .secure-sidebar {
            position: sticky;
            top: calc(var(--nav-height) + 24px);
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .side-card {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 22px;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        .side-label {
            display: block;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            color: var(--text-weak);
            margin-bottom: 14px;
        }
        .side-link {
            display: block;
            padding: 10px 14px;
            border-radius: 12px;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            border-left: 2px solid transparent;
            transition: all .25s ease;
        }
        .side-link:hover {
            color: var(--primary);
            background: rgba(0, 229, 255, 0.06);
            border-left-color: var(--primary);
            text-decoration: none;
        }
        .side-help {
            background: rgba(255, 92, 138, 0.04);
            border-color: rgba(255, 92, 138, 0.15);
        }
        .side-help p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .side-help .btn {
            width: 100%;
        }

        /* Secure content */
        .secure-content {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .secure-topic {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 34px;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
        }
        .secure-topic:hover {
            transform: translateY(-4px);
            border-color: var(--border-bright);
            box-shadow: var(--shadow-card);
        }
        .topic-wide {
            width: 100%;
        }
        .topic-narrow.is-left {
            margin-right: 72px;
        }
        .topic-narrow.is-right {
            margin-left: 72px;
        }
        .topic-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 18px;
            flex-wrap: wrap;
        }
        .topic-head h3 {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-main);
        }
        .topic-badge {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            background: rgba(255, 92, 138, 0.12);
            color: var(--accent);
            border: 1px solid rgba(255, 92, 138, 0.25);
            flex-shrink: 0;
        }
        .topic-body p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.85;
            margin-bottom: 18px;
        }
        .topic-body ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .topic-body ul li {
            position: relative;
            padding-left: 26px;
            font-size: 14px;
            color: var(--text-main);
        }
        .topic-body ul li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 8px;
            width: 14px;
            height: 8px;
            border-left: 2px solid var(--primary);
            border-bottom: 2px solid var(--primary);
            transform: rotate(-45deg);
        }

        /* Secure flow */
        .secure-flow-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 32px;
            align-items: center;
        }
        .secure-steps {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .step-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }
        .step-num {
            font-size: 24px;
            font-weight: 900;
            color: transparent;
            -webkit-text-stroke: 1px var(--primary);
            line-height: 1.2;
            width: 40px;
            flex-shrink: 0;
            font-family: 'SF Mono', Consolas, monospace;
        }
        .step-item strong {
            display: block;
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .step-item p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
        }
        .secure-flow-img img {
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            width: 100%;
            height: 220px;
            object-fit: cover;
            border: 1px solid var(--border);
        }

        /* FAQ */
        .faq-section {
            padding: var(--section-gap) 0;
            background: var(--bg-dark);
        }
        .faq-layout {
            display: grid;
            grid-template-columns: 0.9fr 1.1fr;
            gap: 56px;
            align-items: flex-start;
        }
        .faq-left {
            position: sticky;
            top: calc(var(--nav-height) + 24px);
        }
        .faq-left .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
            padding: 5px 14px;
            border-radius: 999px;
            margin-bottom: 16px;
        }
        .faq-left h2 {
            font-size: 32px;
            font-weight: 900;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .faq-left p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--glass-bg);
            border: 1px solid var(--border);
            border-radius: 18px;
            overflow: hidden;
            transition: border-color .3s ease, box-shadow .3s ease;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }
        .faq-item.open {
            border-color: var(--border-bright);
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.08);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            user-select: none;
        }
        .faq-question .q-text {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
            line-height: 1.5;
        }
        .faq-question .q-icon {
            width: 26px;
            height: 26px;
            border-radius: 50%;
            border: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            flex-shrink: 0;
            transition: transform .3s ease, background .3s ease, border-color .3s ease;
            font-size: 16px;
            font-style: normal;
            line-height: 1;
        }
        .faq-item.open .faq-question .q-icon {
            transform: rotate(45deg);
            background: rgba(0, 229, 255, 0.08);
            border-color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer p {
            padding: 0 24px 24px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.85;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 18px;
        }

        /* CTA banner */
        .cta-banner {
            position: relative;
            padding: 96px 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            text-align: center;
            overflow: hidden;
        }
        .cta-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(5, 13, 31, 0.85) 0%, rgba(10, 24, 48, 0.72) 100%);
        }
        .cta-banner::after {
            content: "";
            position: absolute;
            bottom: -100px;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 220px;
            background: radial-gradient(ellipse, rgba(0, 229, 255, 0.2), transparent 70%);
            border-radius: 50%;
        }
        .cta-banner .container {
            position: relative;
            z-index: 2;
            max-width: 720px;
            margin: 0 auto;
        }
        .cta-banner h2 {
            font-size: 32px;
            font-weight: 900;
            color: var(--text-main);
            margin-bottom: 14px;
            line-height: 1.3;
        }
        .cta-banner p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-deep);
            padding: 64px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-brand .brand {
            min-width: 0;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.9;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color .25s ease;
        }
        .footer-col ul li a:hover {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 4px;
        }
        .footer-col p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.9;
        }
        .footer-trust {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            padding: 24px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            margin-bottom: 24px;
        }
        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 6px 14px;
            white-space: nowrap;
        }
        .trust-badge svg {
            width: 13px;
            height: 13px;
            color: var(--primary);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-weak);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-search {
                width: 140px;
            }
            .nav-links a {
                padding: 8px 12px;
                font-size: 13px;
            }
            .defense-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .secure-layout {
                grid-template-columns: 210px 1fr;
                gap: 28px;
            }
            .topic-narrow.is-left,
            .topic-narrow.is-right {
                margin-right: 32px;
                margin-left: 32px;
            }
            .faq-layout {
                gap: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 767px) {
            .nav-links,
            .nav-actions .nav-search,
            .nav-actions .nav-divider,
            .nav-actions .nav-icon-btn {
                display: none;
            }
            .menu-btn {
                display: inline-flex;
            }
            .nav-actions {
                margin-left: auto;
                gap: 8px;
            }
            .nav-actions .btn {
                display: inline-flex;
            }
            .container {
                padding: 0 var(--pad-mobile);
            }
            .hero {
                min-height: auto;
                padding: calc(var(--nav-height) + 32px) 0 48px;
            }
            .hero .container {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .hero h1 {
                font-size: 28px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .hero-cta {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-cta .btn {
                width: 100%;
            }
            .hero-metrics {
                gap: 16px;
            }
            .hero-metric .value {
                font-size: 17px;
            }
            .security-panel {
                width: 100%;
                max-width: 360px;
            }
            .section {
                padding: var(--section-gap-mobile) 0;
            }
            .secure-section {
                padding: var(--section-gap-mobile) 0;
            }
            .section-head h2,
            .secure-head h2,
            .faq-left h2,
            .cta-banner h2 {
                font-size: 22px;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .defense-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .secure-layout {
                grid-template-columns: 1fr;
            }
            .secure-sidebar {
                position: static;
                flex-direction: row;
                overflow-x: auto;
                padding-bottom: 8px;
                gap: 12px;
                scrollbar-width: none;
            }
            .secure-sidebar::-webkit-scrollbar {
                display: none;
            }
            .side-card {
                min-width: 200px;
                flex-shrink: 0;
                padding: 16px;
            }
            .side-card .side-label {
                margin-bottom: 8px;
            }
            .side-card .side-link {
                white-space: nowrap;
                display: inline-block;
                padding: 6px 12px;
                border-left: none;
                border-bottom: 2px solid transparent;
                font-size: 13px;
            }
            .side-card .side-link:hover {
                border-left: none;
                border-bottom-color: var(--primary);
            }
            .side-help {
                display: none;
            }
            .secure-topic {
                padding: 24px 20px;
            }
            .topic-narrow.is-left,
            .topic-narrow.is-right {
                margin-right: 0;
                margin-left: 0;
                width: 100%;
            }
            .topic-head h3 {
                font-size: 18px;
            }
            .secure-flow-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .secure-flow-img img {
                height: 180px;
            }
            .faq-layout {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .faq-left {
                position: static;
            }
            .faq-question .q-text {
                font-size: 14px;
            }
            .cta-banner {
                padding: 64px 0;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .cta-buttons .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        @media (max-width: 520px) {
            .brand span {
                font-size: 15px;
            }
            .nav-inner {
                gap: 8px;
            }
            .nav-actions .btn {
                padding: 8px 14px;
                font-size: 13px;
            }
            .hero-badge {
                font-size: 11px;
                padding: 5px 10px;
            }
            .step-num {
                font-size: 20px;
            }
            .secure-topic {
                padding: 20px 16px;
            }
        }