* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    :root {
      --primary: #4f46e5;
      --primary-dark: #3730a3;
      --text: #172033;
      --muted: #64748b;
      --border: #e2e8f0;
      --background: #f8fafc;
    }

    body {
      font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI",
        sans-serif;
      background: var(--background);
      color: var(--text);
      line-height: 1.75;
    }

    a {
      color: var(--primary);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    .navbar {
      background: #fff;
      border-bottom: 1px solid var(--border);
    }

    .nav-container {
      max-width: 1150px;
      margin: auto;
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
    }

    .logo {
      color: var(--text);
      font-size: 23px;
      font-weight: 800;
      letter-spacing: -1px;
    }

    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      flex-wrap: wrap;
      gap: 22px;
      align-items: center;
    }

    .nav-links a {
      color: #475569;
      font-size: 14px;
      font-weight: 600;
    }

    .nav-links .nav-button {
      background: var(--primary);
      color: white;
      padding: 10px 17px;
      border-radius: 9px;
    }

    .hero {
      background: linear-gradient(135deg, #eef2ff, #f8fafc 75%);
      border-bottom: 1px solid var(--border);
      padding: 65px 24px 55px;
      text-align: center;
    }

    .eyebrow {
      display: inline-block;
      color: var(--primary-dark);
      background: #e0e7ff;
      border-radius: 30px;
      padding: 5px 13px;
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .hero h1 {
      margin: 18px 0 12px;
      font-size: clamp(32px, 5vw, 47px);
      line-height: 1.2;
      letter-spacing: -1.5px;
    }

    .hero p {
      max-width: 680px;
      margin: auto;
      color: var(--muted);
      font-size: 16px;
    }

    .updated {
      margin-top: 18px;
      color: #64748b;
      font-size: 13px;
    }

    .page-layout {
      max-width: 1150px;
      margin: 45px auto;
      padding: 0 24px;
      display: grid;
      grid-template-columns: 245px minmax(0, 1fr);
      gap: 32px;
      align-items: start;
    }

    .toc {
      position: sticky;
      top: 25px;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 15px;
      padding: 22px;
    }

    .toc h2 {
      font-size: 15px;
      margin-bottom: 13px;
    }

    .toc a {
      display: block;
      padding: 6px 0;
      color: #64748b;
      font-size: 13px;
      line-height: 1.5;
    }

    .content {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 38px;
      min-width: 0;
    }

    .notice {
      background: #fffbeb;
      border: 1px solid #fde68a;
      border-radius: 12px;
      padding: 18px 20px;
      margin-bottom: 30px;
      color: #78350f;
    }

    .notice strong {
      display: block;
      margin-bottom: 4px;
    }

    .content section {
      padding: 0 0 25px;
      margin-bottom: 25px;
      border-bottom: 1px solid #edf0f5;
      scroll-margin-top: 25px;
    }

    .content section:last-child {
      border-bottom: none;
      margin-bottom: 0;
    }

    .content h2 {
      font-size: 21px;
      margin-bottom: 12px;
      letter-spacing: -0.4px;
    }

    .content p {
      color: #475569;
      font-size: 14px;
      margin-bottom: 12px;
    }

    .content ul {
      padding-left: 22px;
      margin: 10px 0 14px;
      color: #475569;
      font-size: 14px;
    }

    .content li {
      margin-bottom: 7px;
    }

    .footer {
      border-top: 1px solid var(--border);
      background: #fff;
      padding: 30px 24px;
    }

    .footer-inner {
      max-width: 1150px;
      margin: auto;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 18px;
    }

    .footer p {
      color: var(--muted);
      font-size: 13px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
    }

    .footer-links a {
      color: #64748b;
      font-size: 13px;
    }

    @media (max-width: 800px) {
      .page-layout {
        grid-template-columns: 1fr;
        margin-top: 25px;
      }

      .toc {
        position: static;
      }

      .toc-list {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0 15px;
      }

      .content {
        padding: 25px 20px;
      }
    }

    @media (max-width: 520px) {
      .nav-container {
        align-items: flex-start;
        flex-direction: column;
      }

      .nav-links {
        gap: 13px;
      }

      .hero {
        padding: 45px 20px;
      }

      .toc-list {
        grid-template-columns: 1fr;
      }
    }