:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --ink: #172033;
  --muted: #667085;
  --line: #e7ebf2;
  --brand: #2457d6;
  --brand-2: #16a085;
  --warm: #ffb84d;
  --shadow: 0 18px 45px rgba(24, 38, 78, .10);
  --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.skip-link { position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden; }
.skip-link:focus { left:16px; top:16px; width:auto; height:auto; background:#fff; padding:10px 14px; z-index:999; border-radius:10px; }
.site-header { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(16px); background: rgba(246,248,251,.88); border-bottom: 1px solid rgba(231,235,242,.9); }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 76px; }
.logo { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; letter-spacing: .5px; }
.logo-mark { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; color: #fff; background: linear-gradient(135deg, var(--brand), var(--brand-2)); box-shadow: 0 10px 24px rgba(36,87,214,.25); }
.logo-text span { display:block; font-size: 13px; color: var(--muted); font-weight: 600; line-height: 1.2; }
.nav { display:flex; flex-wrap:wrap; gap: 8px; align-items:center; justify-content:flex-end; }
.nav a { padding: 9px 12px; border-radius: 999px; color: #344054; font-size: 15px; font-weight: 700; }
.nav a:hover, .nav a[aria-current="page"] { background: #eaf0ff; color: var(--brand); }
.search-wrap { padding: 0 0 16px; }
.search-box { display:flex; align-items:center; gap:10px; background: var(--card); border:1px solid var(--line); border-radius: 18px; padding: 10px; box-shadow: 0 8px 24px rgba(24,38,78,.05); }
.search-box input { flex:1; border:0; outline:0; font: inherit; min-width:0; padding: 9px 10px; background: transparent; }
.search-box button, .btn { border:0; cursor:pointer; padding: 11px 18px; border-radius: 999px; font-weight: 800; background: var(--brand); color:#fff; box-shadow: 0 12px 25px rgba(36,87,214,.20); }
.search-tip { margin:8px 4px 0; color: var(--muted); font-size: 14px; min-height: 22px; }
.hero { padding: 56px 0 34px; background: radial-gradient(circle at 15% 10%, #e6f0ff 0, transparent 30%), radial-gradient(circle at 90% 20%, #e8fff6 0, transparent 28%); }
.breadcrumb { color: var(--muted); font-size:14px; margin-bottom: 18px; }
.breadcrumb a { color: var(--brand); font-weight: 800; }
.hero-grid { display:grid; grid-template-columns: 1.04fr .96fr; gap: 34px; align-items:center; }
.eyebrow { display:inline-flex; align-items:center; gap:8px; color: var(--brand); background:#eaf0ff; padding: 7px 12px; border-radius:999px; font-weight: 900; font-size: 14px; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; margin: 0 0 14px; letter-spacing: -.02em; }
h1 { font-size: clamp(34px, 6vw, 64px); }
h2 { font-size: clamp(28px, 4vw, 42px); }
h3 { font-size: 22px; }
p { margin: 0 0 14px; }
.lead { color: #475467; font-size: 18px; max-width: 720px; }
.hero-actions { display:flex; flex-wrap:wrap; gap: 12px; margin: 24px 0; }
.btn.secondary { background: #fff; color: var(--brand); border: 1px solid #d9e3ff; box-shadow: none; }
.stats { display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 24px; }
.stat { background: rgba(255,255,255,.75); border: 1px solid var(--line); border-radius: 18px; padding: 14px; }
.stat strong { display:block; font-size: 22px; color: var(--brand); }
.hero-card { background: var(--card); border:1px solid var(--line); border-radius: 30px; padding: 16px; box-shadow: var(--shadow); }
.video-card { background: var(--card); border:1px solid var(--line); border-radius: var(--radius); overflow:hidden; box-shadow: 0 14px 34px rgba(24,38,78,.07); position: relative; }
.video-figure { margin:0; position: relative; aspect-ratio: 16/9; overflow:hidden; background:#dde6f2; }
.video-figure img, .video-shell { width:100%; height:100%; object-fit:cover; }
.video-shell { position:absolute; inset:0; opacity:0; pointer-events:none; }
.play-button { position:absolute; inset:50% auto auto 50%; transform:translate(-50%, -50%) scale(.86); opacity:0; width:72px; height:72px; border-radius:50%; border:0; color:#fff; font-size:28px; cursor:pointer; background: rgba(36,87,214,.92); box-shadow: 0 12px 28px rgba(0,0,0,.22); transition: .22s ease; }
.video-card:hover .play-button, .video-card:focus-within .play-button { opacity:1; transform:translate(-50%, -50%) scale(1); }
.video-body { padding: 18px; }
.tags { display:flex; flex-wrap:wrap; gap:8px; margin: 10px 0; }
.tag { display:inline-flex; align-items:center; border-radius:999px; padding: 4px 9px; font-size: 13px; font-weight: 800; color:#2457d6; background:#eaf0ff; }
.video-meta { display:flex; flex-wrap:wrap; gap:10px 14px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); margin-top: 14px; padding-top: 12px; }
.section { padding: 58px 0; }
.section-head { display:flex; justify-content:space-between; gap:20px; align-items:end; margin-bottom: 24px; }
.section-head p { color: var(--muted); max-width: 640px; }
.grid { display:grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 10px 28px rgba(24,38,78,.05); }
.card .icon { width:46px; height:46px; display:grid; place-items:center; border-radius:16px; color:#fff; background: linear-gradient(135deg, var(--brand), var(--brand-2)); font-weight:900; margin-bottom:14px; }
.steps { counter-reset: steps; }
.step { display:grid; grid-template-columns: 74px 1fr; gap: 16px; align-items:start; }
.step-num { width:58px; height:58px; border-radius:18px; display:grid; place-items:center; background:#eaf0ff; color:var(--brand); font-weight:900; font-size:20px; }
.timeline { position:relative; }
.timeline .card { border-left: 5px solid var(--brand); }
.faq-item { padding: 0; overflow:hidden; }
.faq-q { width:100%; text-align:left; border:0; background:#fff; padding: 18px 20px; font: inherit; font-weight:900; cursor:pointer; color: var(--ink); display:flex; justify-content:space-between; gap:14px; }
.faq-a { padding: 0 20px 18px; color: var(--muted); display:block; }
.review strong { display:block; margin-bottom: 4px; }
.stars { color:#b7791f; letter-spacing:1px; }
.contact-panel { display:grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.domain-chip { display:inline-flex; align-items:center; gap:6px; padding:6px 10px; border-radius:999px; background:#eefaf5; color:#08775b; font-weight:900; }
.img-note { color: var(--muted); font-size: 13px; margin-top: 8px; }
.cta-band { border-radius: 28px; padding: 30px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); color:#fff; display:flex; justify-content:space-between; gap:20px; align-items:center; box-shadow: var(--shadow); }
.cta-band .btn { background:#fff; color: var(--brand); box-shadow:none; }
.site-footer { background:#101828; color:#d0d5dd; margin-top: 46px; padding: 42px 0 24px; }
.footer-grid { display:grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 24px; }
.site-footer a { color:#fff; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.1); margin-top:26px; padding-top:18px; display:flex; flex-wrap:wrap; gap:12px; justify-content:space-between; }
.share-list { display:flex; flex-wrap:wrap; gap: 10px; }
.share-list button { border:1px solid var(--line); background:#fff; border-radius:999px; padding:10px 14px; cursor:pointer; font-weight:800; }
.table-like { display:grid; gap:10px; }
.table-row { display:grid; grid-template-columns: 120px 1fr; gap:14px; padding:12px; border:1px solid var(--line); border-radius:14px; background:#fff; }
.notice { background:#fff8e6; color:#7a4b00; border:1px solid #ffe4a6; padding:14px 16px; border-radius:18px; }
@media (max-width: 900px) {
  .hero-grid, .grid-2, .grid-3, .contact-panel, .footer-grid { grid-template-columns: 1fr; }
  .section-head { align-items:start; flex-direction:column; }
  .stats { grid-template-columns: 1fr; }
  .cta-band { flex-direction:column; align-items:flex-start; }
}
@media (max-width: 640px) {
  .topbar { align-items:flex-start; flex-direction:column; padding: 14px 0; }
  .nav { justify-content:flex-start; }
  .search-box { flex-direction:column; align-items:stretch; }
  .step { grid-template-columns: 1fr; }
  .table-row { grid-template-columns: 1fr; }
  h1 { font-size: 34px; }
  .hero { padding-top: 34px; }
}