:root {
  --bg0: #0b1220;
  --bg1: #122033;
  --ink: #e8eef7;
  --muted: #9aadc2;
  --brand: #14b8a6;
  --brand-deep: #0f766e;
  --line: rgba(255,255,255,.12);
  --card: rgba(255,255,255,.04);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Segoe UI Semibold", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(20,184,166,.22), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(56,189,248,.12), transparent 50%),
    linear-gradient(180deg, var(--bg0), var(--bg1) 40%, #0a101a);
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
.wrap { width: min(1100px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(11,18,32,.72);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -.02em;
  font-size: 1.25rem;
}
.brand span { color: var(--brand); }
.nav-links { display: flex; gap: 18px; align-items: center; color: var(--muted); font-size: .95rem; }
.nav-links a:hover { color: var(--ink); }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; padding: 12px 18px; font-weight: 700;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-deep)); color: #041513; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: rgba(20,184,166,.5); }
.hero {
  padding: 72px 0 48px;
  min-height: calc(100vh - 64px);
  display: flex; align-items: center;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 40px;
  align-items: center;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.03em;
  margin: 0 0 16px;
}
.hero p.lead {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.6;
  max-width: 36rem;
  margin: 0 0 28px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-panel {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 30px 80px rgba(0,0,0,.35);
}
.hero-panel .code {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: .12em;
  margin: 8px 0 18px;
}
.hero-panel .label { color: var(--muted); font-size: .85rem; }
.section { padding: 64px 0; }
.section h2 {
  font-size: 1.8rem;
  margin: 0 0 10px;
  letter-spacing: -.02em;
}
.section .lead { color: var(--muted); margin: 0 0 28px; max-width: 40rem; }
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 16px;
  padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); line-height: 1.55; }
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: .9rem;
}
.footer-row {
  display: flex; flex-wrap: wrap; gap: 16px;
  align-items: flex-start; justify-content: space-between;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a:hover { color: var(--ink); }
.legal h3 { margin: 28px 0 10px; font-size: 1.15rem; }
.legal p { color: var(--muted); line-height: 1.65; margin: 0 0 12px; max-width: 48rem; }
.steps {
  margin: 0; padding: 0; list-style: none;
  display: grid; gap: 14px; max-width: 40rem;
}
.steps li {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 14px;
  padding: 16px 18px;
  display: grid; gap: 6px;
}
.steps li strong { color: var(--ink); }
.steps li span { color: var(--muted); line-height: 1.55; font-size: .95rem; }
.hint-box {
  margin: 24px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--brand);
  background: rgba(20,184,166,.08);
  color: var(--muted);
  border-radius: 0 10px 10px 0;
  max-width: 40rem;
  line-height: 1.55;
}
.btn.is-disabled { opacity: .45; pointer-events: none; }
@media (max-width: 860px) {
  .hero-grid, .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 40px; min-height: auto; }
}