:root {
  --bg: #0f172a;
  --fg: #e2e8f0;
  --muted: #94a3b8;
  --accent: #f6821f;
  --card: #1e293b;
  --card-border: #334155;
}

* {
  box-sizing: border-box;
  margin: 0;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

.hero {
  flex: 1;
  max-width: 880px;
  width: 100%;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.9rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  font-size: 0.875rem;
  color: var(--muted);
}

h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.subtitle {
  color: var(--muted);
  max-width: 34rem;
  margin: 0 auto 3rem;
}

code {
  padding: 0.15em 0.45em;
  border-radius: 6px;
  background: var(--card);
  border: 1px solid var(--card-border);
  font-size: 0.875em;
  color: var(--accent);
}

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

a:hover {
  text-decoration: underline;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  text-align: left;
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  background: var(--card);
}

.card h2 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--muted);
  font-size: 0.925rem;
}

footer {
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--card-border);
}