:root {
  color-scheme: light dark;
  --bg: #FAFAF9;
  --surface: #FFFFFF;
  --border: #E8E6E1;
  --text: #1F2320;
  --text-secondary: #565B57;
  --accent: #3D6B5C;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181A;
    --surface: #1F2225;
    --border: #33383C;
    --text: #F2F3F1;
    --text-secondary: #A6ACA8;
    --accent: #6FBFA0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.8;
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

h1 {
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 800;
  margin: 8px 0 4px;
}

.updated {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 40px;
}

h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 36px 0 10px;
}

p, li {
  font-size: 15px;
  color: var(--text-secondary);
}

a { color: var(--accent); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  margin: 20px 0;
}

nav.crumbs {
  font-size: 13px;
  margin-bottom: 24px;
}
nav.crumbs a { color: var(--text-secondary); text-decoration: none; }
nav.crumbs a:hover { color: var(--accent); }