:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #4f46e5;
  --border: #e5e7eb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
.container {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
}
header {
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,.9);
}
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.brand {
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text);
}
.navlinks {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.navlinks a {
  color: var(--muted);
  text-decoration: none;
}
.navlinks a:hover { color: var(--accent); }
.hero {
  text-align: center;
  padding: 88px 0 64px;
}
.hero h1 {
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  margin: 0 0 16px;
  line-height: 1.05;
}
.hero p {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 650px;
  margin: 0 auto 28px;
}
.badge {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 18px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 18px;
  margin: 36px 0 72px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 6px 20px rgba(17,24,39,.04);
}
.card h3 { margin-top: 0; }
.page {
  padding: 56px 0 80px;
}
.page h1 { margin-bottom: 8px; }
.page h2 { margin-top: 36px; }
.meta { color: var(--muted); margin-bottom: 32px; }
a { color: var(--accent); }
footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: .95rem;
}
.notice {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  padding: 16px 18px;
  border-radius: 14px;
  margin: 20px 0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d12;
    --card: #121722;
    --text: #f3f4f6;
    --muted: #9ca3af;
    --accent: #a5b4fc;
    --border: #263041;
  }
  header { background: rgba(11,13,18,.9); }
  .badge { background: #1d2440; }
  .notice { background: #241b12; border-color: #6b4423; }
}