*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --bg: #FFFFFF; --surface: #F8FAFC;
      --border: rgba(15,23,42,0.08);
      --green: #16A34A; --green-glow: rgba(22,163,74,0.2);
      --text: #0F172A; --text-muted: #94A3B8; --text-secondary: #475569;
      --radius: 16px; --radius-full: 9999px;
    }
    body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--text); line-height: 1.75; overflow-x: hidden; position: relative; }
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      display: flex; align-items: center; justify-content: space-between;
      padding: 20px 48px;
      backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      background: rgba(255,255,255,0.90);
      border-bottom: 1px solid var(--border);
    }
    .nav-logo { display: flex; align-items: center; gap: 10px; font-size: 22px; letter-spacing: -0.4px; text-decoration: none; color: var(--text); }
    .logo-name { font-weight: 400; }
    .logo-name b { font-weight: 800; }
    .logo-img { height: 56px; width: auto; display: block; }
    .nav-back { font-size: 14px; font-weight: 500; color: var(--text-secondary); text-decoration: none; display: flex; align-items: center; gap: 6px; transition: color 0.2s; }
    .nav-back:hover { color: var(--text); }
    .nav-right { display: flex; align-items: center; gap: 18px; }
    .lang-switcher { display: flex; align-items: center; gap: 3px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-full); padding: 5px 12px; }
    .lang-btn { background: none; border: none; cursor: pointer; font-family: 'Inter', sans-serif; font-size: 12px; font-weight: 600; color: var(--text-muted); padding: 2px 4px; letter-spacing: 0.6px; transition: color 0.15s; }
    .lang-btn.active { color: var(--text); }
    .lang-btn:hover  { color: var(--text); }
    .lang-sep { font-size: 11px; color: var(--border); user-select: none; }

    main { max-width: 720px; margin: 0 auto; padding: 120px 24px 80px; }
    .page-label { font-size: 12px; font-weight: 700; letter-spacing: 1.2px; color: var(--green); text-transform: uppercase; margin-bottom: 16px; }
    h1 { font-size: 42px; font-weight: 900; letter-spacing: -1.5px; line-height: 1.1; margin-bottom: 12px; }
    .updated { font-size: 13px; color: var(--text-muted); margin-bottom: 56px; }
    h2 { font-size: 20px; font-weight: 800; letter-spacing: -0.4px; margin: 40px 0 12px; }
    p { font-size: 15px; color: var(--text-secondary); margin-bottom: 16px; }
    ul { padding-left: 20px; color: var(--text-secondary); font-size: 15px; margin-bottom: 16px; }
    li { margin-bottom: 6px; }
    a { color: var(--green); text-decoration: none; }
    a:hover { text-decoration: underline; }

    footer {
      padding: 28px 48px; border-top: 1px solid var(--border);
      display: flex; align-items: center; justify-content: space-between;
      background: var(--surface);
    }
    .footer-logo { display: flex; align-items: center; gap: 9px; font-size: 18px; color: var(--text); text-decoration: none; }
    .footer-note { font-size: 13px; color: var(--text-muted); }
    .footer-links { display: flex; gap: 24px; }
    .footer-links a { font-size: 13px; color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
    .footer-links a:hover { color: var(--text); }

    .nav-toggle { display: none; background: none; border: 0; cursor: pointer; color: var(--text); padding: 8px; margin: -8px -8px -8px 0; line-height: 0; -webkit-tap-highlight-color: transparent; }
    .nav-toggle .ico-x { display: none; }
    .nav-toggle[aria-expanded="true"] .ico-bars { display: none; }
    .nav-toggle[aria-expanded="true"] .ico-x { display: block; }
    @media (max-width: 640px) {
      nav { padding: 16px 20px; }
      main { padding: 100px 20px 60px; }
      footer { flex-direction: column; gap: 18px; text-align: center; padding: 24px 20px; }
      .nav-toggle { display: inline-flex; align-items: center; }
      nav .nav-right {
        display: flex; flex-direction: column; align-items: stretch; gap: 6px;
        position: absolute; left: 20px; right: 20px; top: 100%;
        background: #fff; border: 1px solid var(--border); border-radius: 0 0 18px 18px;
        padding: 12px; box-shadow: 0 18px 40px rgba(15,23,42,0.10);
        opacity: 0; visibility: hidden; transform: translateY(-10px);
        transition: opacity .2s ease, transform .2s ease, visibility 0s linear .2s;
        pointer-events: none;
      }
      nav .nav-right.open { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; transition: opacity .2s ease, transform .2s ease, visibility 0s; }
      .nav-right .lang-switcher { justify-content: center; align-self: center; }
      .nav-right .nav-back { justify-content: center; padding: 12px; border-radius: 12px; }
      .nav-right .nav-back:hover { background: var(--surface); }
    }