:root {
  --bg: #07111f;
  --surface: #0d1b2d;
  --surface-2: #13243a;
  --text: #f3f7fb;
  --muted: #9fb0c5;
  --line: rgba(255, 255, 255, 0.1);
  --brand: #69e3c3;
  --brand-2: #7aa7ff;
  --warning: #ffd166;
  --radius: 20px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Microsoft YaHei", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(105, 227, 195, 0.13), transparent 28%),
    radial-gradient(circle at 90% 20%, rgba(122, 167, 255, 0.12), transparent 26%),
    var(--bg);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(7, 17, 31, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: -.02em; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.nav-links { display: flex; align-items: center; gap: 24px; color: var(--muted); font-size: 14px; }
.nav-links a:hover, .footer a:hover { color: var(--brand); }
.menu-btn { display: none; border: 1px solid var(--line); color: var(--text); background: var(--surface); padding: 8px 12px; border-radius: 10px; }
.hero { padding: 84px 0 52px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 48px; align-items: center; }
.eyebrow, .tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 12px; border: 1px solid rgba(105, 227, 195, .3);
  border-radius: 999px; color: var(--brand); background: rgba(105, 227, 195, .08);
  font-size: 13px; font-weight: 700;
}
h1 { font-size: clamp(42px, 7vw, 76px); line-height: 1.04; letter-spacing: -.055em; margin: 20px 0; }
h2 { font-size: clamp(28px, 4vw, 42px); line-height: 1.18; letter-spacing: -.035em; margin: 0 0 14px; }
h3 { margin: 0 0 8px; line-height: 1.35; }
.lead { font-size: 18px; color: var(--muted); max-width: 680px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 19px; border-radius: 13px;
  border: 1px solid var(--line); font-weight: 800;
}
.btn-primary { color: #04130f; background: var(--brand); border-color: var(--brand); }
.btn-secondary { background: rgba(255,255,255,.04); }
.hero-visual { position: relative; padding: 12px; background: linear-gradient(135deg, rgba(105,227,195,.22), rgba(122,167,255,.1)); border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow); }
.hero-visual img { width: 880px; height: auto; aspect-ratio: 44/35; object-fit: cover; border-radius: 18px; }
.mini-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 28px; }
.stat { padding: 15px; background: rgba(255,255,255,.035); border: 1px solid var(--line); border-radius: 14px; }
.stat strong { display: block; color: var(--text); }
.stat span { font-size: 13px; color: var(--muted); }
.section { padding: 72px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 32px; margin-bottom: 28px; }
.section-head p { max-width: 600px; margin: 0; color: var(--muted); }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  position: relative; padding: 25px; overflow: hidden;
  background: linear-gradient(145deg, rgba(19,36,58,.96), rgba(13,27,45,.95));
  border: 1px solid var(--line); border-radius: var(--radius);
}
.card p, .muted { color: var(--muted); }
.card p:last-child { margin-bottom: 0; }
.icon {
  width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 18px;
  border-radius: 12px; color: var(--brand); background: rgba(105,227,195,.1);
  border: 1px solid rgba(105,227,195,.2); font-size: 20px;
}
.card-link { transition: transform .2s ease, border-color .2s ease; }
.card-link:hover { transform: translateY(-4px); border-color: rgba(105,227,195,.45); }
.module-label { position: absolute; top: 12px; right: 14px; color: #6e8198; font: 11px ui-monospace, monospace; letter-spacing: .08em; }
.status { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 5px rgba(105,227,195,.1); }
.feature-row { display: grid; grid-template-columns: .9fr 1.1fr; gap: 18px; }
.feature-row + .feature-row { margin-top: 18px; }
.feature-row .card:first-child { min-height: 280px; display: flex; flex-direction: column; justify-content: flex-end; background: linear-gradient(160deg, rgba(122,167,255,.19), var(--surface)); }
.checklist { list-style: none; padding: 0; margin: 18px 0 0; }
.checklist li { position: relative; padding-left: 27px; margin: 9px 0; color: var(--muted); }
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--brand); font-weight: 900; }
.platform { text-align: center; }
.platform .icon { margin-inline: auto; }
.faq details { padding: 20px 0; border-top: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 800; }
.faq details p { color: var(--muted); margin-bottom: 0; }
.notice { padding: 18px 20px; border-left: 3px solid var(--warning); background: rgba(255,209,102,.07); color: #ddcfaa; border-radius: 0 14px 14px 0; }
.steps { counter-reset: steps; }
.step { padding-left: 74px; }
.step::before {
  counter-increment: steps; content: counter(steps, decimal-leading-zero);
  position: absolute; left: 24px; top: 24px; color: var(--brand);
  font: 800 20px ui-monospace, monospace;
}
.code {
  padding: 14px 16px; overflow-wrap: anywhere; background: #050c16; border: 1px solid var(--line);
  border-radius: 12px; color: #b8c9dc; font-family: ui-monospace, monospace; font-size: 13px;
}
.cta { padding: 38px; display: flex; align-items: center; justify-content: space-between; gap: 28px; background: linear-gradient(120deg, rgba(105,227,195,.18), rgba(122,167,255,.13)); }
.footer { padding: 56px 0 24px; border-top: 1px solid var(--line); background: rgba(2,9,17,.45); }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: 34px; }
.footer h3 { font-size: 14px; }
.footer a, .footer p { display: block; color: var(--muted); font-size: 14px; margin: 7px 0; }
.copyright { margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line); color: #73869c; font-size: 13px; }

@media (max-width: 900px) {
  .hero-grid, .feature-row { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .menu-btn { display: block; }
  .nav-links { display: none; position: absolute; inset: 72px 14px auto; padding: 16px; flex-direction: column; align-items: stretch; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
  .nav-links.open { display: flex; }
  .hero { padding-top: 54px; }
  h1 { font-size: 43px; }
  .mini-stats, .grid-2, .grid-4, .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 54px 0; }
  .section-head, .cta { align-items: flex-start; flex-direction: column; }
}