:root {
  --bg: #0a0f1f;
  --bg-soft: #0f1830;
  --text: #f4f7ff;
  --muted: #b8c4ea;
  --primary: #7aa2ff;
  --primary-strong: #4d79ff;
  --card: #101a36;
  --border: #273766;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background:
    radial-gradient(900px 500px at 85% -10%, #233f8b 0%, transparent 60%),
    radial-gradient(500px 280px at 0% 20%, #1b2f6f66 0%, transparent 60%),
    var(--bg);
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: #a8c3ff; }

.container {
  width: min(1040px, 92%);
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(10, 15, 31, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}

.logo {
  color: var(--text);
  font-weight: 800;
  letter-spacing: 1px;
}

.nav nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.nav nav a { color: var(--muted); }
.nav nav a:hover { color: var(--text); }

.hero {
  padding: 92px 0 48px;
}

.badge {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #dce7ff;
  border: 1px solid rgba(122, 162, 255, 0.45);
  background: rgba(122, 162, 255, 0.14);
  border-radius: 999px;
  padding: 4px 12px;
}

h1 {
  margin: 14px 0 12px;
  line-height: 1.1;
  font-size: clamp(34px, 7vw, 58px);
}

.subtitle {
  max-width: 680px;
  font-size: 18px;
  color: var(--muted);
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  border-radius: 10px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn.primary {
  border: none;
  color: white;
  background: linear-gradient(180deg, var(--primary), var(--primary-strong));
}

.section {
  padding: 42px 0;
}

.section h2 {
  margin: 0 0 14px;
  font-size: 28px;
}

.section p {
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.025), transparent), var(--card);
}

.card h3 { margin-top: 0; }

.tags {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tags li {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: #d6e1ff;
  font-size: 14px;
}

.footer {
  padding: 22px 0 44px;
  color: var(--muted);
}

@media (max-width: 720px) {
  .nav-inner {
    flex-direction: column;
    gap: 10px;
  }

  .hero {
    padding-top: 60px;
  }
}