:root {
      --bg: var(--iuve-bg);
      --surface: var(--iuve-surface);
      --text: var(--iuve-text);
      --muted: var(--iuve-muted);
      --line: var(--iuve-border);
      --brand: var(--iuve-primary);
      --accent: var(--iuve-accent);
      --shadow: var(--iuve-shadow-md);
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      font-family: var(--iuve-font-sans);
      color: var(--text);
      background:
        radial-gradient(900px 520px at 10% -10%, rgba(11, 95, 255, 0.14), transparent 58%),
        radial-gradient(900px 520px at 100% 0%, rgba(24, 163, 122, 0.14), transparent 58%),
        var(--bg);
    }

    .shell { max-width: 1000px; margin: 0 auto; padding: 24px; }

    .top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 22px;
      gap: 12px;
      flex-wrap: wrap;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      color: var(--text);
      text-decoration: none;
      font-family: "Space Grotesk", "IBM Plex Sans", sans-serif;
      font-weight: 700;
    }

    .brand img { width: 34px; height: 34px; border-radius: 0; background: transparent; box-shadow: none; }

    .lang-box {
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: 7px 10px;
      background: #fff;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .lang-box label { font-size: 13px; color: var(--muted); }

    .lang-box select {
      border: 1px solid #c8d3e5;
      border-radius: 8px;
      padding: 5px 8px;
      background: #fff;
    }

    .card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: 18px;
      box-shadow: var(--shadow);
      padding: 28px;
    }

    h1 {
      margin: 0 0 10px;
      font-size: clamp(26px, 4vw, 38px);
      font-family: "Space Grotesk", "IBM Plex Sans", sans-serif;
      line-height: 1.08;
    }

    .lead {
      margin: 0 0 20px;
      color: var(--muted);
      line-height: 1.6;
      max-width: 760px;
      font-size: 15px;
    }

    /* ── Accordion ── */
    .acc { margin-top: 6px; display: flex; flex-direction: column; gap: 8px; }

    details {
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #fbfdff;
      overflow: hidden;
    }

    details[open] { border-color: #b6cdf5; box-shadow: 0 4px 16px rgba(11,95,255,0.06); }

    summary {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 14px 18px;
      cursor: pointer;
      font-family: "Space Grotesk", "IBM Plex Sans", sans-serif;
      font-size: 15px;
      font-weight: 600;
      list-style: none;
      user-select: none;
      transition: background 0.15s;
    }

    summary::-webkit-details-marker { display: none; }

    summary:hover { background: #f0f5ff; }

    .chevron {
      margin-left: auto;
      width: 18px;
      height: 18px;
      flex-shrink: 0;
      color: var(--muted);
      transition: transform 0.2s;
    }

    details[open] .chevron { transform: rotate(180deg); }

    .icon {
      width: 28px;
      height: 28px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      flex-shrink: 0;
    }

    .tag {
      margin-left: 8px;
      padding: 2px 8px;
      border-radius: 20px;
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    .tag-new { background: #dcfce7; color: #166534; }
    .tag-api { background: #e0f2fe; color: #0c4a6e; }

    .acc-body {
      padding: 0 18px 16px;
      border-top: 1px solid var(--line);
    }

    .acc-body p, .acc-body li { color: var(--muted); line-height: 1.6; font-size: 14px; }
    .acc-body ul, .acc-body ol { margin: 8px 0 0; padding-left: 20px; }
    .acc-body p { margin: 10px 0 0; }

    .route-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 10px;
      font-size: 13px;
    }

    .route-table th {
      text-align: left;
      padding: 6px 10px;
      background: #f0f5ff;
      color: #334155;
      border-bottom: 1px solid var(--line);
    }

    .route-table td {
      padding: 7px 10px;
      border-bottom: 1px solid #edf1f8;
      color: var(--muted);
      vertical-align: top;
    }

    .route-table tr:last-child td { border-bottom: none; }

    code { background: #f0f5ff; border-radius: 5px; padding: 1px 5px; font-size: 12px; }

    pre {
      margin: 10px 0 0;
      padding: 12px;
      border-radius: 10px;
      border: 1px solid #d7e0f0;
      background: #f4f8ff;
      overflow-x: auto;
      font-size: 12px;
      line-height: 1.5;
    }

    .links {
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .links a {
      text-decoration: none;
      color: #0c4ed8;
      font-weight: 600;
      font-size: 14px;
    }

    .note {
      margin-top: 16px;
      border-left: 3px solid var(--accent);
      padding: 8px 12px;
      font-size: 13px;
      color: var(--muted);
      background: #f0fdf8;
      border-radius: 0 8px 8px 0;
    }

    @media (max-width: 960px) {
      .shell {
        padding: var(--iuve-space-5);
      }

      .card {
        padding: 22px;
      }
    }

    @media (max-width: 640px) {
      .shell {
        padding: var(--iuve-space-4);
      }

      .lang-box {
        width: 100%;
        justify-content: space-between;
      }

      .card {
        padding: 16px;
        border-radius: var(--iuve-radius-md);
      }

      summary {
        padding: 12px 14px;
        font-size: 14px;
      }

      .acc-body {
        padding: 0 14px 14px;
      }

      .route-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
      }
    }