:root {
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #38bdf8;
  --line: #1f2937;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #020617;
  color: var(--text);
}

a {
  color: var(--primary);
  text-decoration: none;
}

.container {
  width: min(1080px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: rgba(2, 6, 23, 0.75);
  border-bottom: 1px solid var(--line);
  z-index: 10;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.3px;
}

nav {
  display: flex;
  gap: 16px;
}

nav a {
  color: var(--text);
  font-size: 14px;
}

.hero {
  padding: 84px 0 64px;
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 35%),
    radial-gradient(circle at top right, rgba(99, 102, 241, 0.12), transparent 30%);
}

.tag {
  color: var(--primary);
  font-size: 14px;
  margin-bottom: 8px;
}

h1 {
  font-size: clamp(30px, 4vw, 46px);
  margin: 0 0 12px;
}

.subtitle {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
  max-width: 720px;
}

.btn {
  display: inline-block;
  margin-top: 18px;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--primary);
  color: #082f49;
  font-weight: 700;
}

.section {
  padding: 56px 0;
}

.section.alt {
  background: rgba(15, 23, 42, 0.5);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head h2,
.section h2 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 28px;
}

.section-head p,
.section p {
  color: var(--muted);
  margin-top: 0;
}

.grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.6);
  padding: 18px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.card p {
  color: var(--muted);
  line-height: 1.6;
  min-height: 70px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.badge {
  font-size: 12px;
  border: 1px solid #334155;
  color: #cbd5e1;
  border-radius: 999px;
  padding: 3px 10px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 36px;
}

.site-footer p {
  margin: 6px 0;
  color: var(--muted);
  font-size: 14px;
}

.record {
  color: #f8fafc;
}

.split {
  margin: 0 6px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}