:root { color-scheme: light dark; --fg: #1d1d1f; --muted: #6b6b70; --bg: #fafafa; --card: #fff; --line: #e4e4e8; --accent: #d93a00; }
@media (prefers-color-scheme: dark) { :root { --fg: #ececf0; --muted: #a0a0a8; --bg: #141416; --card: #1d1d21; --line: #2e2e34; } }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.7 system-ui, -apple-system, 'Hiragino Sans', 'Noto Sans JP', sans-serif; color: var(--fg); background: var(--bg); }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
nav { display: flex; gap: 16px; flex-wrap: wrap; font-size: 14px; margin-bottom: 24px; }
a { color: var(--accent); }
h1 { font-size: 30px; line-height: 1.25; }
h2 { font-size: 20px; margin-top: 32px; }
.lead { font-size: 18px; color: var(--muted); }
.cta { display: inline-block; background: var(--accent); color: #fff; padding: 12px 22px; border-radius: 10px; font-weight: 700; text-decoration: none; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.card h3 { margin: 0 0 4px; font-size: 16px; }
.card p { margin: 0; font-size: 14px; color: var(--muted); }
footer { margin-top: 48px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; }
.updated { color: var(--muted); font-size: 14px; }
.note { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 10px; padding: 12px 16px; }
.guides { padding-left: 20px; }
.guides li { margin-bottom: 12px; }
.guides span { display: block; font-size: 14px; color: var(--muted); }
h3 { font-size: 17px; margin: 24px 0 4px; }