:root {
  color-scheme: dark;
  --bg: #000000;
  --text: #f5f5f7;
  --muted: #98989f;
  --line: rgba(255, 255, 255, .09);
  --accent: #0a84ff;
  --accent-soft: rgba(10, 132, 255, .16);
  --panel: rgba(255, 255, 255, .045);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }

body {
  background:
    radial-gradient(circle at 50% -20%, rgba(10, 132, 255, .18), transparent 42%),
    #000000;
}

.landing-nav {
  max-width: 1080px; margin: 0 auto; min-height: 72px;
  display: flex; align-items: center; justify-content: space-between; padding: 0 26px;
}
.landing-brand { color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 17px; letter-spacing: -.02em; }
.landing-mark {
  width: 32px; height: 32px; display: grid; place-items: center; border-radius: 10px;
  background: linear-gradient(135deg, #0a84ff, #4da3ff); color: #fff; font-weight: 800; font-size: 16px;
  box-shadow: 0 8px 24px rgba(10, 132, 255, .28);
}
.landing-link { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 600; transition: color .16s ease; }
.landing-link:hover { color: var(--text); }

.landing-hero { max-width: 1080px; margin: 0 auto; padding: 92px 26px 64px; text-align: center; }
.landing-kicker { margin: 0 0 18px; color: var(--accent); font-size: 13px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.landing-hero h1 { margin: 0 auto; max-width: 820px; font-size: clamp(46px, 7vw, 78px); line-height: 1.02; letter-spacing: -.055em; font-weight: 760; }
.landing-sub { margin: 26px auto 0; max-width: 680px; color: var(--muted); font-size: 18px; line-height: 1.7; letter-spacing: -.01em; }

.landing-actions { margin-top: 38px; display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.landing-primary, .landing-secondary {
  text-decoration: none; border-radius: 999px; padding: 14px 25px; font-size: 15px; font-weight: 650;
  transition: transform .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}
.landing-primary { background: var(--accent); color: #fff; box-shadow: 0 12px 34px rgba(10, 132, 255, .28); }
.landing-primary:hover { background: #3d9bff; transform: translateY(-1px); }
.landing-secondary { border: 1px solid rgba(255, 255, 255, .12); color: var(--text); background: rgba(255, 255, 255, .055); }
.landing-secondary:hover { background: rgba(255, 255, 255, .1); border-color: rgba(255, 255, 255, .2); }

.landing-cards {
  margin-top: 72px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; text-align: left;
}
.landing-cards article {
  border: 1px solid var(--line); border-radius: 26px; padding: 26px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .052), rgba(255, 255, 255, .014)), var(--panel);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .04) inset, 0 24px 70px rgba(0, 0, 0, .34);
}
.landing-card-label { display: inline-block; color: #dcecff; background: var(--accent-soft); border: 1px solid rgba(10, 132, 255, .28); border-radius: 999px; padding: 5px 10px; font-size: 12px; font-weight: 700; margin-bottom: 18px; }
.landing-cards h2 { margin: 0 0 10px; font-size: 20px; letter-spacing: -.02em; }
.landing-cards p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.landing-footer {
  max-width: 1080px; margin: 0 auto; padding: 30px 26px 40px;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  color: var(--muted); font-size: 13px; border-top: 1px solid var(--line);
}

@media (max-width: 820px) {
  .landing-hero { padding-top: 64px; }
  .landing-cards { grid-template-columns: 1fr; margin-top: 56px; }
  .landing-footer { justify-content: center; text-align: center; }
}
@media print { .landing-nav, .landing-actions, .landing-footer { display: none; } }