:root {
  --bg: #ffffff;
  --surface: #f5f6f8;
  --text: #14161a;
  --muted: #5b6270;
  --border: #e3e6ea;
  --accent: #4f46e5;
  --accent-text: #ffffff;
  --radius: 14px;
  --max: 960px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #181b21;
    --text: #eef0f3;
    --muted: #9aa2b1;
    --border: #2a2f38;
    --accent: #818cf8;
    --accent-text: #0f1115;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 16px;
}
.brand { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 0.95rem; }
nav a:hover { color: var(--text); }

.hero { padding: 88px 0 64px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
.hero p { font-size: 1.15rem; color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-text);
  padding: 12px 20px; border-radius: 10px; text-decoration: none; font-weight: 600;
}

section { padding: 48px 0; border-top: 1px solid var(--border); }
section h2 { font-size: 1.5rem; margin: 0 0 12px; letter-spacing: -0.01em; }
section > .wrap > p { color: var(--muted); max-width: 680px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-top: 20px;
}
.card h3 { margin: 0 0 6px; font-size: 1.2rem; }
.card p { margin: 0 0 10px; color: var(--muted); }
.card ul { margin: 8px 0 0; padding-left: 20px; color: var(--muted); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }

footer.site { border-top: 1px solid var(--border); padding: 32px 0 48px; color: var(--muted); font-size: 0.9rem; }
footer.site .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
footer.site a { color: var(--muted); margin-right: 16px; }

.legal { padding: 56px 0; }
.legal h1 { font-size: 2rem; margin: 0 0 4px; }
.legal .updated { color: var(--muted); margin: 0 0 32px; }
.legal h2 { font-size: 1.2rem; margin: 32px 0 8px; }
.legal p, .legal li { color: var(--text); max-width: 720px; }

@media (max-width: 560px) {
  nav a { margin-left: 14px; font-size: 0.9rem; }
  .hero { padding: 56px 0 40px; }
}