/* じゅけんがんばるの巻 — Web Docs Styles */
:root {
  --bg: #ffffff;
  --fg: #0f172a; /* slate-900 */
  --muted: #475569; /* slate-600 */
  --primary: #2563eb; /* blue-600 */
  --accent: #f59e0b; /* amber-500 */
  --card: #f8fafc; /* slate-50 */
  --border: #e2e8f0; /* slate-200 */
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --primary: #60a5fa;
    --accent: #fbbf24;
    --card: #0f172a;
    --border: #1f2937;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "YuGothic", Meiryo, sans-serif;
  line-height: 1.6;
}
.container { max-width: 900px; margin: 0 auto; padding: 24px; }
.header {
  padding: 32px 0 12px; border-bottom: 1px solid var(--border);
}
.app-title { font-size: clamp(24px, 3.6vw, 40px); margin: 0; }
.subtitle { color: var(--muted); margin: 4px 0 0; font-size: 14px; }
.nav { margin-top: 12px; display: flex; gap: 12px; flex-wrap: wrap; }
.nav a { color: var(--primary); text-decoration: none; font-weight: 600; }
.nav a:hover { text-decoration: underline; }
.hero {
  background: linear-gradient(120deg, color-mix(in srgb, var(--primary) 12%, transparent), transparent);
  border: 1px solid var(--border);
  border-radius: 14px; padding: 20px; margin: 20px 0 28px;
}
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
h2 { margin-top: 28px; margin-bottom: 10px; font-size: 22px; }
h3 { margin-top: 20px; margin-bottom: 8px; font-size: 18px; }
ul { padding-left: 18px; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.grid2 { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 720px) { .grid2 { grid-template-columns: 1fr 1fr; } }
.footer { margin: 36px 0 12px; color: var(--muted); font-size: 13px; }
.badge { display: inline-block; background: var(--border); color: var(--muted); padding: 2px 8px; border-radius: 999px; font-size: 12px; margin-left: 6px; }