:root {
  --bg: #07111f;
  --panel: rgba(15, 30, 51, 0.88);
  --panel-2: #10243c;
  --line: #294360;
  --text: #eef7ff;
  --muted: #a6bdd2;
  --brand: #4ee4bd;
  --brand-2: #58a6ff;
  --warning: #ffd166;
  --radius: 20px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 80% 0, rgba(88, 166, 255, .16), transparent 28rem),
    radial-gradient(circle at 10% 20%, rgba(78, 228, 189, .09), transparent 24rem),
    var(--bg);
  font: 16px/1.7 Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button, select { font: inherit; }
:focus-visible { outline: 3px solid var(--warning); outline-offset: 3px; }
.skip-link {
  position: fixed; top: -60px; left: 16px; z-index: 999;
  padding: 10px 16px; background: white; color: #07111f; border-radius: 8px;
}
.skip-link:focus { top: 12px; }
.container { width: min(1160px, calc(100% - 36px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(7, 17, 31, .9); border-bottom: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(16px);
}
.nav-wrap { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { padding: 9px 12px; color: var(--muted); text-decoration: none; border-radius: 9px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); background: rgba(255,255,255,.07); }
.nav-toggle { display: none; padding: 8px 12px; border: 1px solid var(--line); border-radius: 9px; color: var(--text); background: var(--panel); }
.hero { padding: 76px 0 46px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 58px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 0 18px;
  padding: 6px 11px; border: 1px solid rgba(78,228,189,.35);
  border-radius: 99px; color: var(--brand); background: rgba(78,228,189,.08); font-size: 14px; font-weight: 700;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; background: var(--brand); border-radius: 50%; box-shadow: 0 0 12px var(--brand); }
h1 { max-width: 750px; margin: 0 0 20px; font-size: clamp(38px, 6vw, 68px); line-height: 1.08; letter-spacing: -.045em; }
.subhero h1 { font-size: clamp(36px, 5vw, 56px); }
.lead { max-width: 720px; margin: 0 0 28px; color: var(--muted); font-size: 19px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding: 10px 18px; border: 1px solid var(--line); border-radius: 12px;
  color: var(--text); background: rgba(255,255,255,.04); text-decoration: none; font-weight: 750;
}
.btn-primary { border-color: transparent; color: #032119; background: linear-gradient(135deg, var(--brand), #7af0d0); box-shadow: 0 10px 30px rgba(78,228,189,.18); }
.btn:hover { transform: translateY(-1px); }
.hero-art { position: relative; }
.hero-art::before { content: ""; position: absolute; inset: 8% -4% -8% 5%; z-index: -1; border-radius: 30px; background: linear-gradient(135deg, rgba(78,228,189,.18), rgba(88,166,255,.14)); filter: blur(24px); }
.hero-art img { width: 880px; height: auto; aspect-ratio: 88/70; object-fit: cover; border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.statbar { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 36px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(15,30,51,.68); }
.stat { padding: 22px; text-align: center; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat strong { display: block; color: var(--brand); font-size: 22px; }
.stat span { color: var(--muted); font-size: 14px; }
.section { padding: 72px 0; }
.section-soft { background: rgba(255,255,255,.025); border-block: 1px solid rgba(255,255,255,.06); }
.section-head { max-width: 760px; margin-bottom: 30px; }
.kicker { margin: 0 0 8px; color: var(--brand); font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h2 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 42px); line-height: 1.18; letter-spacing: -.025em; }
h3 { margin: 0 0 8px; line-height: 1.3; }
p { margin-top: 0; }
.muted { 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 {
  padding: 24px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(17,39,64,.9), rgba(12,27,46,.9));
  box-shadow: 0 12px 35px rgba(0,0,0,.12);
}
.card p:last-child { margin-bottom: 0; }
.card-icon {
  display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 17px;
  border: 1px solid rgba(78,228,189,.3); border-radius: 12px; color: var(--brand); background: rgba(78,228,189,.08); font-weight: 900;
}
.topic-link { text-decoration: none; }
.topic-link:hover { border-color: var(--brand); }
.topic-link span { color: var(--brand); font-weight: 750; }
.detail { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: start; }
.terminal {
  overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #050c15; box-shadow: var(--shadow);
}
.terminal-top { display: flex; gap: 7px; padding: 13px 16px; border-bottom: 1px solid var(--line); }
.terminal-top i { width: 9px; height: 9px; border-radius: 50%; background: #ff6b6b; }
.terminal-top i:nth-child(2) { background: #ffd166; }
.terminal-top i:nth-child(3) { background: var(--brand); }
.terminal-body { padding: 26px; color: #a8d8c9; font: 14px/1.9 Consolas, monospace; }
.terminal-body b { color: var(--brand); }
.platform-card { position: relative; overflow: hidden; }
.platform-card::after { content: attr(data-mark); position: absolute; right: 12px; bottom: -22px; color: rgba(255,255,255,.035); font-size: 86px; font-weight: 900; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { padding: 18px 4px; cursor: pointer; font-weight: 750; }
.faq details p { padding: 0 4px 18px; color: var(--muted); }
.subhero { padding: 66px 0 38px; border-bottom: 1px solid rgba(255,255,255,.06); }
.breadcrumb { margin-bottom: 12px; color: var(--muted); font-size: 14px; }
.breadcrumb a { color: var(--brand); }
.control-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.control { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.control label { display: block; margin: 16px 0 7px; font-weight: 750; }
.select { width: 100%; min-height: 48px; padding: 9px 12px; color: var(--text); border: 1px solid var(--line); border-radius: 10px; background: #0b1a2d; }
.result { min-height: 98px; margin-top: 18px; padding: 16px; border-left: 3px solid var(--brand); background: rgba(78,228,189,.07); }
.notice { padding: 18px 20px; border: 1px solid rgba(255,209,102,.35); border-radius: 14px; color: #ffe7aa; background: rgba(255,209,102,.07); }
.steps { counter-reset: steps; }
.step { position: relative; padding-left: 72px; }
.step::before {
  counter-increment: steps; content: counter(steps);
  position: absolute; left: 22px; top: 22px; display: grid; place-items: center; width: 34px; height: 34px;
  border-radius: 50%; color: #032119; background: var(--brand); font-weight: 900;
}
.cta { padding: 34px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border: 1px solid rgba(78,228,189,.35); border-radius: 24px; background: linear-gradient(120deg, rgba(78,228,189,.12), rgba(88,166,255,.11)); }
.cta h2 { font-size: 30px; }
.site-footer { padding: 50px 0 24px; border-top: 1px solid var(--line); background: #050d18; }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: 36px; }
.footer-grid h3 { font-size: 15px; }
.footer-links { display: grid; gap: 7px; }
.footer-links a { color: var(--muted); }
.footer-note { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); color: #8199ad; font-size: 13px; }
.logo-large { width: 64px; height: 64px; margin-bottom: 14px; border-radius: 16px; }

@media (max-width: 900px) {
  .hero-grid, .detail, .control-panel { grid-template-columns: 1fr; }
  .hero-art { max-width: 700px; }
  .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: 700px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; top: 66px; left: 18px; right: 18px; padding: 10px; border: 1px solid var(--line); border-radius: 14px; background: #0b192b; box-shadow: var(--shadow); }
  .nav.open { display: grid; }
  .hero { padding-top: 48px; }
  .grid-2, .grid-4, .footer-grid { grid-template-columns: 1fr; }
  .statbar { grid-template-columns: 1fr; }
  .stat + .stat { border-left: 0; border-top: 1px solid var(--line); }
  .cta { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}