:root {
  --bg: #030913;
  --ink: #edf8ff;
  --muted: #8fa5c2;
  --blue: #38bdf8;
  --cyan: #22f7d7;
  --violet: #8b5cf6;
  --line: rgba(120, 210, 255, .22);
  --card: rgba(6, 21, 40, .82);
  --shadow: 0 24px 72px rgba(34, 247, 215, .12);
  --r: 26px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(34,247,215,.05) 1px, transparent 1px),
    linear-gradient(rgba(56,189,248,.05) 1px, transparent 1px),
    radial-gradient(circle at 18% 12%, rgba(34,247,215,.25), transparent 25rem),
    radial-gradient(circle at 82% 20%, rgba(139,92,246,.25), transparent 28rem),
    linear-gradient(180deg, #020610 0%, #07182d 50%, #020711 100%);
  background-size: 52px 52px, 52px 52px, auto, auto, auto;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.topbar { position: sticky; top: 0; z-index: 10; background: rgba(3,9,19,.78); backdrop-filter: blur(18px); border-bottom: 1px solid var(--line); }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; }
.logo { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(from 130deg, var(--cyan), var(--blue), var(--violet), var(--cyan)); color: #02111d; box-shadow: 0 0 38px rgba(34,247,215,.36); }
.links { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; }
.links a, .lang { padding: 10px 13px; border-radius: 999px; border: 1px solid transparent; }
.links a:hover, .links .active { color: var(--ink); border-color: var(--line); background: rgba(34,247,215,.09); }
.lang { color: var(--cyan); border-color: var(--line); }
.hero { padding: 94px 0 70px; overflow: hidden; position: relative; }
.hero::before { content: ""; position: absolute; inset: 13% -8% auto auto; width: 620px; height: 620px; border-radius: 50%; border: 1px solid rgba(34,247,215,.18); background: repeating-conic-gradient(from 0deg, rgba(34,247,215,.16) 0 7deg, transparent 7deg 20deg); opacity: .45; filter: blur(.2px); }
.hero-grid, .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 46px; align-items: center; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.eyebrow span, .tag { display: inline-flex; padding: 8px 12px; border-radius: 999px; color: #c6fff5; background: rgba(34,247,215,.08); border: 1px solid rgba(34,247,215,.28); font-weight: 900; font-size: 13px; }
h1, h2, h3 { margin: 0; letter-spacing: -.04em; }
h1 { font-size: clamp(46px, 7.6vw, 94px); line-height: .94; max-width: 940px; }
h2 { font-size: clamp(30px, 4vw, 52px); line-height: 1.06; margin: 14px 0; }
h3 { font-size: 20px; margin-bottom: 10px; }
p { color: var(--muted); line-height: 1.8; }
.lead { max-width: 720px; font-size: 18px; margin: 24px 0; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 20px; border-radius: 999px; font-weight: 900; color: #03111d; background: linear-gradient(135deg, var(--cyan), var(--blue)); box-shadow: 0 0 34px rgba(34,247,215,.3); }
.btn-soft { color: var(--ink); background: rgba(255,255,255,.06); border: 1px solid var(--line); box-shadow: none; }
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 30px; }
.trust div, .card, .step, .faq-item, .codebox, .visual-card { border: 1px solid var(--line); border-radius: var(--r); background: var(--card); box-shadow: var(--shadow); }
.trust div { padding: 16px; }
.trust b { display: block; color: var(--cyan); font-size: 22px; }
.trust span { color: var(--muted); font-size: 13px; }
.device { position: relative; padding: 16px; border-radius: 34px; border: 1px solid var(--line); background: linear-gradient(145deg, rgba(34,247,215,.12), rgba(139,92,246,.08)); box-shadow: 0 0 80px rgba(34,247,215,.15); overflow: hidden; }
.device::before { content: "PROTOCOL MAP"; position: absolute; right: 24px; top: 24px; z-index: 2; padding: 8px 12px; border-radius: 999px; background: rgba(2,8,18,.7); color: var(--cyan); border: 1px solid var(--line); font-size: 12px; font-weight: 900; }
.device img { border-radius: 24px; aspect-ratio: 4 / 5; object-fit: cover; }
section { padding: 74px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 28px; }
.section-head p { max-width: 560px; margin: 0; }
.grid { display: grid; gap: 18px; }
.platforms { grid-template-columns: repeat(5, 1fr); }
.cards, .compat, .reco-grid, .use-grid { grid-template-columns: repeat(3, 1fr); }
.steps { grid-template-columns: repeat(3, 1fr); counter-reset: step; }
.faq { grid-template-columns: repeat(2, 1fr); }
.card, .step, .faq-item { padding: 24px; }
.icon { width: 44px; height: 44px; display: grid; place-items: center; margin-bottom: 16px; border-radius: 16px; color: #03111d; font-weight: 900; background: linear-gradient(135deg, var(--cyan), var(--blue)); }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.meta span { color: var(--muted); font-size: 12px; border-radius: 999px; background: rgba(255,255,255,.06); padding: 7px 10px; }
.codebox { padding: 24px; font-family: Consolas, "Courier New", monospace; color: #c6fff5; line-height: 1.9; }
.checklist { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.checklist span { border: 1px solid var(--line); border-radius: 16px; padding: 14px; color: var(--muted); background: rgba(255,255,255,.04); }
.visual-card { padding: 16px; overflow: hidden; }
.visual-card img, .reco img { width: 100%; object-fit: cover; border-radius: 20px; }
.reco img { height: 190px; margin-bottom: 18px; }
.step::before { counter-increment: step; content: "PROTOCOL 0" counter(step); display: inline-flex; padding: 8px 12px; border-radius: 999px; color: #03111d; background: var(--cyan); font-size: 12px; font-weight: 900; margin-bottom: 16px; }
.cta-box { text-align: center; border-radius: 34px; padding: 48px; border: 1px solid rgba(34,247,215,.3); background: radial-gradient(circle at 50% 0, rgba(34,247,215,.18), transparent 28rem), var(--card); box-shadow: 0 0 80px rgba(34,247,215,.14); }
.footer { padding: 36px 0; border-top: 1px solid var(--line); color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(5, 1fr); gap: 18px; }
.footer b { color: var(--ink); display: block; margin-bottom: 10px; }
@media (max-width: 900px) {
  .nav { flex-direction: column; align-items: flex-start; padding: 16px 0; }
  .hero-grid, .split, .platforms, .cards, .compat, .reco-grid, .use-grid, .steps, .faq, .checklist, .footer-grid { grid-template-columns: 1fr; }
  .section-head { display: block; }
}