body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif;line-height:1.6;color:#111;margin:0;padding:0;background:#fff}
    header,footer{padding:24px 16px;background:#f6f6f6}
    main{max-width:900px;margin:0 auto;padding:24px 16px}
    h1{font-size:28px;margin:0 0 8px}
    h2{font-size:22px;margin-top:28px}
    h3{font-size:18px;margin-top:20px}
    .lang-switch{display:flex;gap:8px;margin-top:8px}
    .lang-switch button{padding:6px 10px;border:1px solid #ccc;background:#fff;cursor:pointer;border-radius:6px}
    .lang-switch button.active{background:#111;color:#fff;border-color:#111}
    .muted{color:#666}
    .card{background:#fff;border:1px solid #e6e6e6;border-radius:10px;padding:16px}
    .note{background:#fff8d8;border:1px solid #f1d88f;padding:12px;border-radius:8px}
    .lang-en{display:none}
    .toc{border-left:3px solid #eee;padding-left:12px}
    a{color:#0b63ce;text-decoration:none}
    a:hover{text-decoration:underline}
    .badge{display:inline-block;background:#eef3ff;border:1px solid #d7e2ff;color:#0b63ce;padding:2px 8px;border-radius:999px;font-size:12px}
    ul{margin-top:0}