* { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; background: #f5f5f7; color: #111; }
    a { text-decoration: none; color: #4f46e5; }
    header { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid #eee; height: 48px; display: flex; align-items: center; gap: 8px; padding: 0 12px; }
    .back-btn { width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; color: #555; font-size: 18px; }
    .header-title { flex: 1; font-size: 15px; font-weight: 600; }
    main { padding: 20px 16px 48px; }
    .card { background: #fff; border-radius: 16px; border: 1px solid #f0f0f0; padding: 20px 16px; margin-bottom: 12px; }
    h1 { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
    .updated { font-size: 11px; color: #aaa; margin-bottom: 20px; }
    h2 { font-size: 13px; font-weight: 700; color: #111; margin-bottom: 8px; margin-top: 20px; }
    h2:first-of-type { margin-top: 0; }
    p { font-size: 13px; color: #374151; line-height: 1.8; margin-bottom: 8px; }
    ul { font-size: 13px; color: #374151; line-height: 1.8; padding-left: 18px; margin-bottom: 8px; }
    footer { background: #fff; border-top: 1px solid #eee; padding: 20px 16px 32px; }