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

    :root {
      --blue: #0051FD;
      --dark: #090A0C;
      --dark-30: #B3B7BE;
      --dark-40: #9A9FA8;
      --dark-20: #CCCFD4;
      --dark-10: #E6E7E9;
      --dark-7: #EDEEF0;
      --bg: #FFFFFF;
      --nav-h: 60px;
    }

    html { scroll-behavior: smooth; max-width: 100%; overflow-x: clip; }
    body { max-width: 100%; overflow-x: clip; }

    .skip-link {
      position: absolute;
      left: 16px;
      top: -48px;
      z-index: 300;
      padding: 10px 14px;
      border-radius: 10px;
      background: var(--blue);
      color: #fff;
      font-size: 15px;
      font-weight: 600;
      text-decoration: none;
      transition: top .15s ease;
    }

    .skip-link:focus {
      top: 12px;
    }

    body {
      font-family: 'Outfit', sans-serif;
      font-size: 19px;
      line-height: 1.5;
      color: var(--dark);
      background: var(--bg);
    }

    nav {
      position: sticky;
      top: 0;
      z-index: 100;
      min-height: var(--nav-h);
      background: #fff;
      border-bottom: 1px solid var(--dark-10);
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      padding: 0 32px;
      padding-top: 10px;
      padding-bottom: 10px;
      gap: 24px;
    }

    .nav-logo {
      text-decoration: none;
      display: flex;
      align-items: center;
    }

    .nav-logo img {
      height: 36px;
      width: auto;
    }

    .nav-links {
      margin-left: auto;
      display: flex;
      gap: 24px;
    }

    .nav-links a {
      font-size: 17px;
      font-weight: 500;
      color: var(--dark-40);
      text-decoration: none;
      transition: color .15s;
    }

    .nav-links a:hover, .nav-links a.active { color: var(--blue); }
    .nav-links a[aria-current="page"] { color: var(--blue); }

    .layout {
      display: grid;
      grid-template-columns: 240px 1fr;
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 24px;
      gap: 48px;
      align-items: start;
    }

    .sidebar {
      position: sticky;
      top: calc(var(--nav-h) + 32px);
      padding: 32px 0 0;
      align-self: start;
    }

    .sidebar-label {
      font-size: 11px;
      font-weight: 600;
      letter-spacing: .08em;
      text-transform: uppercase;
      color: var(--dark-40);
      margin-bottom: 12px;
      padding-left: 10px;
    }

    .toc {
      list-style: none;
      padding-left: 0;
      padding-bottom: 24px;
      max-height: calc(100vh - var(--nav-h) - 160px);
      overflow-y: auto;
      scrollbar-width: thin;
      scrollbar-color: var(--dark-20) transparent;
    }

    .toc::-webkit-scrollbar { width: 4px; }
    .toc::-webkit-scrollbar-track { background: transparent; }
    .toc::-webkit-scrollbar-thumb { background: var(--dark-20); border-radius: 2px; }
    .toc li { margin-bottom: 2px; }

    .toc a {
      display: block;
      padding: 5px 10px;
      font-size: 17px;
      font-weight: 400;
      color: var(--dark-40);
      text-decoration: none;
      border-radius: 6px;
      transition: background .12s, color .12s;
      line-height: 1.4;
    }

    .toc a:hover { background: var(--dark-7); color: var(--dark); }
    .toc a.toc-active { background: #EEF4FF; color: var(--blue); font-weight: 500; }

    .content { padding: 40px 0 80px; min-width: 0; }

    .doc-header {
      margin-bottom: 40px;
      padding-bottom: 32px;
      border-bottom: 1px solid var(--dark-10);
    }

    .doc-badge {
      display: inline-block;
      font-size: 15px;
      font-weight: 600;
      letter-spacing: .06em;
      text-transform: uppercase;
      color: var(--blue);
      background: #EEF4FF;
      padding: 4px 10px;
      border-radius: 999px;
      margin-bottom: 14px;
    }

    .doc-title { font-size: 26px; font-weight: 600; line-height: 1.2; color: var(--dark); margin-bottom: 10px; }
    .doc-meta { font-size: 15px; color: var(--dark-40); }

    .section {
      margin-bottom: 48px;
      scroll-margin-top: calc(var(--nav-h) + 24px);
    }

    .section-title {
      font-size: 20px;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 16px;
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .section-num {
      font-size: 15px;
      font-weight: 600;
      color: var(--blue);
      background: #EEF4FF;
      padding: 2px 8px;
      border-radius: 999px;
      flex-shrink: 0;
    }

    h3 { font-size: 19px; font-weight: 600; color: var(--dark); margin: 24px 0 10px; }

    p { margin-bottom: 12px; color: var(--dark); }
    p:last-child { margin-bottom: 0; }

    a { color: var(--blue); text-decoration: none; }
    a:hover { text-decoration: underline; }

    a:focus-visible {
      outline: 3px solid rgba(0, 81, 253, 0.22);
      outline-offset: 3px;
      border-radius: 8px;
    }

    strong { font-weight: 600; }

    ul, ol { padding-left: 20px; margin-bottom: 12px; }
    li { margin-bottom: 6px; color: var(--dark); }

    ol.lettered { list-style-type: lower-alpha; }
    ol.roman { list-style-type: lower-roman; }

    .table-wrap {
      overflow-x: auto;
      margin: 16px 0;
      border-radius: 10px;
      border: 1px solid var(--dark-20);
    }

    table { width: 100%; border-collapse: collapse; font-size: 17px; }

    thead th {
      background: var(--dark-7);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: .03em;
      text-transform: uppercase;
      color: var(--dark-40);
      padding: 10px 14px;
      text-align: left;
      white-space: nowrap;
    }

    tbody tr { border-top: 1px solid var(--dark-10); }
    tbody tr:hover { background: #FAFAFA; }

    td { padding: 10px 14px; color: var(--dark); vertical-align: top; line-height: 1.5; }
    td:first-child { font-weight: 500; color: var(--dark); white-space: nowrap; }

    .callout {
      background: #EEF4FF;
      border-left: 3px solid var(--blue);
      border-radius: 0 8px 8px 0;
      padding: 14px 18px;
      margin: 16px 0;
      font-size: 17px;
      color: var(--dark);
    }

    .callout-warn {
      background: #FFF8E6;
      border-left: 3px solid #F5A623;
      border-radius: 0 8px 8px 0;
      padding: 14px 18px;
      margin: 16px 0;
      font-size: 17px;
      color: var(--dark);
    }

    footer {
      margin-top: 20px;
      border-top: 1px solid var(--dark-10);
      padding: 32px 24px;
      text-align: center;
      font-size: 17px;
      line-height: 1.6;
      color: #6c7380;
    }

    footer a { color: #6c7380; padding: 0 6px; }
    footer a:hover, footer a:focus-visible { color: var(--blue); }

    @media (max-width: 720px) {
      .layout { grid-template-columns: 1fr; gap: 0; padding: 0 16px; min-width: 0; width: 100%; box-sizing: border-box; }
      .sidebar { position: static; padding: 20px 0 0; border-bottom: 1px solid var(--dark-10); margin-bottom: 8px; min-width: 0; overflow: hidden; }
      .toc {
        max-height: none;
        overflow-y: visible;
        display: flex;
        flex-wrap: nowrap;
        gap: 6px;
        overflow-x: auto;
        padding: 8px 0 16px 0;
        scrollbar-width: thin;
      }
      .toc li { margin: 0; }
      .toc a {
        padding: 6px 10px;
        font-size: 12.5px;
        background: var(--dark-7);
        white-space: nowrap;
      }
      nav {
        flex-direction: column;
        align-items: center;
        gap: 18px;
        padding: 32px 16px;
      }
      .nav-links {
        margin-left: 0;
        justify-content: center;
        flex-wrap: wrap;
        gap: 4px 16px;
      }
      .nav-links a {
        font-size: 17px;
      }
      .section {
        scroll-margin-top: 160px;
      }
      .content {
        overflow-wrap: break-word;
        word-break: break-word;
        max-width: 100%;
        min-width: 0;
        padding-bottom: 32px;
      }
      .section:last-child { margin-bottom: 0; }
      img { max-width: 100%; }
      .doc-title { font-size: 22px; }
      td, td:first-child { white-space: normal; min-width: 160px; }
    }

    /* ── DARK MODE ── */
    body.dark-mode {
      --blue: #4D8EF5;
      --dark: #F8F8F8;
      --dark-40: #9E9EA5;
      --dark-30: #6B7080;
      --dark-20: #5A5A5E;
      --dark-10: #3B3B3D;
      --dark-7: #18233A;
      --bg: #2C2C2E;
    }
    body.dark-mode nav { background: #2C2C2E; border-color: #5A5A5E; }
    body.dark-mode tbody tr:hover { background: #3B3B3D; }
    body.dark-mode .toc a.toc-active { background: #2A3240; }
    body.dark-mode .doc-badge { background: #2A3240; }
    body.dark-mode .section-num { background: #2A3240; }
    body.dark-mode .callout { background: #2A3240; }
    body.dark-mode .callout-warn { background: #2A1F00; border-color: #C97B1A; }
    body.dark-mode .doc-header { border-bottom-color: #72727A; }
    body.dark-mode footer { border-top-color: #72727A; }
    body.app-mode .doc-header { border-bottom-color: #A0A2A8; }
    body.app-mode.dark-mode .doc-header { border-bottom-color: #72727A; }

    /* ── APP MODE (source=app) ── */
    body.app-mode nav { display: none; }
    body.app-mode .sidebar { display: none; }
    body.app-mode .layout { grid-template-columns: 1fr; padding: 0 32px; gap: 0; }
    body.app-mode .content { padding: 16px 0 48px; }
    body.app-mode .doc-title { font-size: 22px; }
    body.app-mode footer { display: none; }
    body.app-mode .skip-link { display: none; }