* { margin: 0; padding: 0; box-sizing: border-box; }
  :root {
    --bg: #0A0F1E; --bg2: #0D1530;
    --card: rgba(21, 30, 54, 0.85);
    --line: rgba(148, 163, 184, 0.16);
    --text: #F3F6FC; --sub: #A9BCDE; --dim: #6E84AB;
    --blue: #3B82F6; --blue2: #06B6D4;
    --purple: #8B5CF6; --purple2: #D946EF;
    --orange: #F97316; --orange2: #F59E0B;
  }
  html { scroll-behavior: smooth; }
  body { font-family: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.6; overflow-x: hidden; }
  a { color: inherit; text-decoration: none; }
  .container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }
  .bg-fixed { position: fixed; inset: 0; z-index: -1; pointer-events: none;
    background: radial-gradient(900px 600px at 10% -5%, rgba(59,130,246,.18), transparent 60%),
      radial-gradient(900px 600px at 90% 20%, rgba(139,92,246,.15), transparent 60%),
      radial-gradient(1000px 700px at 50% 100%, rgba(249,115,22,.12), transparent 60%),
      linear-gradient(180deg, #0A0F1E 0%, #0D1530 50%, #0A0F1E 100%); }
  .bg-fixed::after { content: ""; position: absolute; inset: 0;
    background-image: linear-gradient(rgba(148,163,184,.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(148,163,184,.04) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 100%); }
  /* 导航 */
  .nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 18px 0;
    backdrop-filter: blur(20px); background: rgba(10, 15, 30, 0.7); border-bottom: 1px solid var(--line); }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; }
  .logo { display: flex; align-items: center; gap: 12px; }
  .logo-mark { width: 40px; height: 40px; border-radius: 11px;
    background: linear-gradient(135deg, var(--blue), var(--purple) 60%, var(--orange));
    display: flex; align-items: center; justify-content: center; font-size: 19px; font-weight: 900; color: #fff; }
  .logo-text { font-size: 18px; font-weight: 700; letter-spacing: 1.5px; }
  .logo-text small { display: block; font-size: 10px; color: var(--dim); letter-spacing: 2px; font-weight: 400; }
  .menu { display: flex; gap: 40px; }
  .menu a { color: var(--sub); font-size: 15px; transition: color 0.2s; }
  .menu a.active, .menu a:hover { color: var(--text); }
  .nav-cta { padding: 10px 22px; border-radius: 999px;
    background: linear-gradient(135deg, var(--blue), var(--purple)); color: #fff; font-size: 14px; font-weight: 600; }
  /* Hero */
  .hero { padding: 180px 0 120px; text-align: center; position: relative; }
  .hero-kicker { display: inline-flex; align-items: center; gap: 12px; font-size: 13px; letter-spacing: 4px;
    color: var(--sub); padding: 8px 20px; border-radius: 999px;
    background: rgba(148, 163, 184, 0.08); border: 1px solid var(--line); }
  .hero-kicker .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); }
  .hero h1 { margin-top: 32px; font-size: 84px; font-weight: 900; line-height: 1.15; letter-spacing: 2px; }
  .hero h1 .grad { background: linear-gradient(95deg, #EAF1FF 10%, #9DC0FF 40%, #C4B5FD 70%, #FDBA74 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent; }
  .hero-sub { margin: 28px auto 0; max-width: 760px; font-size: 20px; color: var(--sub); line-height: 1.8; }
  .section { padding: 120px 0; position: relative; }
  .section-head { text-align: center; margin-bottom: 80px; }
  .section-kicker { font-size: 13px; letter-spacing: 4px; color: var(--sub);
    display: inline-flex; align-items: center; gap: 12px; }
  .section-kicker::before, .section-kicker::after { content: ""; width: 30px; height: 1px; background: var(--line); }
  .section-title { margin-top: 18px; font-size: 52px; font-weight: 900; letter-spacing: 2px; line-height: 1.2; }
  .section-sub { margin-top: 18px; color: var(--sub); font-size: 18px; }
  /* 服务卡 */
  .svc { margin-bottom: 100px; }
  @media (max-width: 600px) {
    .svc { margin-bottom: 10px; }
  }
  .svc-head { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; margin-bottom: 60px; }
  .svc-info h3 { font-size: 56px; font-weight: 900; letter-spacing: 2px; }
  .svc-info .sub { margin-top: 12px; font-size: 20px; color: var(--sub); }
  .svc-info .value { margin-top: 28px; font-size: 24px; font-weight: 700; }
  .svc-info .desc { margin-top: 28px; color: var(--sub); font-size: 16px; line-height: 1.9; }
  .svc-visual { position: relative; height: 360px; border-radius: 24px;
    background: var(--card); border: 1px solid var(--line); overflow: hidden; display: flex; align-items: center; justify-content: center; }
  .svc-visual::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--c1), var(--c2)); }
  .svc-visual .big-icon { width: 140px; height: 140px; border-radius: 36px;
    background: linear-gradient(135deg, var(--c1), var(--c2));
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 24px 60px var(--shadow); }
  .svc-visual .big-icon svg { width: 70px; height: 70px; }
  .svc-features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
  .feat { padding: 28px 22px; border-radius: 18px; background: var(--card); border: 1px solid var(--line);
    transition: transform 0.3s; position: relative; overflow: hidden; }
  .feat:hover { transform: translateY(-4px); }
  .feat::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--c1), var(--c2)); }
  .feat .n { font-size: 13px; color: var(--dim); letter-spacing: 2px; font-family: Arial; }
  .feat h4 { margin-top: 8px; font-size: 22px; font-weight: 800; letter-spacing: 1.5px; }
  .feat p { margin-top: 14px; color: var(--sub); font-size: 13px; line-height: 1.7; }
  .tags-bar { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 10px; }
  .tag-chip { font-size: 13px; padding: 8px 18px; border-radius: 999px;
    color: var(--sub); border: 1px solid var(--line); background: rgba(148,163,184,.06); }
  .cta-row { text-align: center; margin-top: 60px; }
  .btn { padding: 16px 36px; border-radius: 999px; font-size: 15px; font-weight: 600;
    display: inline-flex; align-items: center; gap: 8px; transition: all 0.25s; }
  .btn-primary { background: linear-gradient(135deg, var(--blue), var(--purple));
    color: #fff; box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4); }
  .btn-ghost { background: rgba(148, 163, 184, 0.08); color: var(--text); border: 1px solid var(--line); margin-left: 16px; }
  .footer { margin-top: 120px; padding: 60px 0 40px; border-top: 1px solid var(--line); background: rgba(5, 9, 16, 0.6); }
  .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px; }
  .footer h5 { font-size: 14px; color: var(--text); margin-bottom: 18px; letter-spacing: 2px; }
  .footer ul { list-style: none; }
  .footer li { margin-bottom: 10px; }
  .footer a { color: var(--sub); font-size: 14px; }
  .footer-bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line);
    display: flex; justify-content: space-between; color: var(--dim); font-size: 12px; letter-spacing: 1.5px; }
  /* 主题色 */
  .c-blue   { --c1: var(--blue);   --c2: var(--blue2);   --vc: #7DB8FF; --shadow: rgba(59,130,246,.3); }
  .c-purple { --c1: var(--purple); --c2: var(--purple2); --vc: #C4B5FD; --shadow: rgba(139,92,246,.3); }
  .c-orange { --c1: var(--orange); --c2: var(--orange2); --vc: #FDBA74; --shadow: rgba(249,115,22,.3); }