:root {
    --primary: var(--brand-primary); --primary-600: var(--brand-primary-600); --primary-700: var(--brand-primary-700);
    --primary-300: var(--brand-primary-300); --primary-50: var(--brand-primary-50);
    --grad: var(--brand-gradient);
    --bg: #F6F5FB; --surface: #FFFFFF; --border: #ECEAF3; --border-strong: #E0DCEE;
    --text: var(--brand-ink); --text-muted: #625E6E; --text-subtle: #9691A1;
    --green: #16A34A; --green-bg: #E9F8EF; --red: #DC2626; --red-bg: #FDECEC;
    --amber: #D97706; --amber-bg: #FEF3E2; --slate: #64748B; --slate-bg: #EEF1F6;
    --code-bg: var(--brand-ink);
    --radius: 14px; --shadow-sm: 0 1px 2px rgba(0,0,0,.05), 0 1px 3px rgba(0,0,0,.04);
    --sidebar-w: 270px;
    font-family: var(--font-brand), "Poppins", system-ui, sans-serif;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; scroll-padding-top: 84px; }
  body { background: var(--bg); color: var(--text); font-size: 15px; -webkit-font-smoothing: antialiased; }
  a { color: var(--primary); text-decoration: none; }
  a:hover { text-decoration: underline; }
  code, pre { font-family: var(--font-code), "JetBrains Mono", ui-monospace, Menlo, monospace; }
  ::-webkit-scrollbar { width: 10px; height: 10px; }
  ::-webkit-scrollbar-thumb { background: #DDD8EA; border-radius: 8px; border: 3px solid var(--bg); }

  /* top bar */
  .topbar {
    position: sticky; top: 0; z-index: 40; height: 64px;
    background: rgba(255,255,255,.92); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; gap: 16px; padding: 0 24px;
  }
  .logo { display: flex; align-items: center; gap: 11px; }
  .docs-logo-img { display: block; width: min(150px, 100%); height: auto; object-fit: contain; }
  .logo-mark { width: 36px; height: 36px; border-radius: 10px; background: var(--grad); display: grid; place-items: center; box-shadow: 0 4px 12px rgba(74,27,240,.32); }
  .logo-mark svg { width: 20px; height: 20px; color: #fff; }
  .logo-name { font-size: 17px; font-weight: 800; letter-spacing: -.02em; }
  .logo-name b { color: var(--primary); }
  .doc-badge { font-size: 12px; font-weight: 700; color: var(--text-subtle); border-left: 1px solid var(--border-strong); padding-left: 14px; margin-left: 2px; }
  .back-link { margin-left: auto; display: inline-flex; align-items: center; gap: 7px; font-weight: 700; font-size: 13.5px; color: var(--text-muted); }
  .back-link:hover { color: var(--primary); text-decoration: none; }
  .back-link svg { width: 16px; height: 16px; }

  .shell { display: flex; max-width: 1240px; margin: 0 auto; }

  /* sidebar */
  .sidebar { width: var(--sidebar-w); flex-shrink: 0; position: sticky; top: 64px; height: calc(100vh - 64px); overflow-y: auto; padding: 26px 18px; }
  .nav-group { margin-bottom: 22px; }
  .nav-group-t { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .07em; color: var(--text-subtle); padding: 0 12px 8px; }
  .nav-link { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 9px; color: var(--text-muted); font-weight: 600; font-size: 14px; }
  .nav-link svg { width: 16px; height: 16px; }
  .nav-link:hover { background: var(--primary-50); color: var(--text); text-decoration: none; }
  .nav-link.active { background: var(--grad); color: #fff; box-shadow: 0 6px 16px rgba(74,27,240,.28); }

  /* content */
  .content { flex: 1; min-width: 0; padding: 36px 40px 120px; }
  section { scroll-margin-top: 84px; padding-bottom: 14px; }
  section + section { margin-top: 46px; border-top: 1px solid var(--border); padding-top: 40px; }
  h1 { font-size: 32px; font-weight: 800; letter-spacing: -.025em; }
  .lead { font-size: 16px; color: var(--text-muted); margin-top: 10px; line-height: 1.6; max-width: 680px; }
  h2 { font-size: 23px; font-weight: 800; letter-spacing: -.02em; display: flex; align-items: center; gap: 11px; }
  h2 .h-ic { width: 34px; height: 34px; border-radius: 10px; background: var(--primary-50); color: var(--primary); display: grid; place-items: center; }
  h2 .h-ic svg { width: 19px; height: 19px; }
  h3 { font-size: 16px; font-weight: 700; margin: 26px 0 10px; }
  p { line-height: 1.65; color: var(--text-muted); margin: 10px 0; max-width: 720px; }
  p strong, li strong { color: var(--text); font-weight: 700; }
  ul { margin: 10px 0 10px 4px; padding-left: 20px; color: var(--text-muted); line-height: 1.8; }

  .endpoint { display: flex; align-items: center; gap: 12px; background: var(--surface); border: 1px solid var(--border); border-radius: 11px; padding: 13px 16px; margin: 16px 0; font-family: var(--font-code), "JetBrains Mono", monospace; font-size: 14px; font-weight: 600; flex-wrap: wrap; }
  .verb { padding: 3px 10px; border-radius: 6px; font-size: 12px; font-weight: 700; color: #fff; }
  .verb.get { background: var(--green); }
  .verb.post { background: var(--primary); }
  .endpoint .path { color: var(--text); word-break: break-all; }

  table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
  th { text-align: left; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--text-subtle); padding: 10px 14px; border-bottom: 1px solid var(--border); }
  td { padding: 12px 14px; border-bottom: 1px solid var(--border); color: var(--text-muted); vertical-align: top; }
  td:first-child { color: var(--text); font-weight: 600; }
  td code, p code, li code { background: var(--primary-50); color: var(--primary-700); padding: 1.5px 6px; border-radius: 5px; font-size: 12.5px; font-weight: 600; }
  .req { display: inline-block; font-size: 10.5px; font-weight: 700; color: var(--red); background: var(--red-bg); border-radius: 5px; padding: 1px 6px; margin-left: 6px; vertical-align: middle; }

  /* code block */
  .code-block { background: var(--code-bg); border-radius: 13px; overflow: hidden; margin: 16px 0; box-shadow: var(--shadow-sm); }
  .cb-tabs { display: flex; align-items: center; gap: 2px; padding: 8px 10px; background: rgba(255,255,255,.04); border-bottom: 1px solid rgba(255,255,255,.08); }
  .cb-tab { background: none; border: none; color: #B7AEDC; font-family: inherit; font-size: 12.5px; font-weight: 700; padding: 6px 12px; border-radius: 7px; cursor: pointer; }
  .cb-tab:hover { color: #fff; background: rgba(255,255,255,.06); }
  .cb-tab.active { color: #fff; background: rgba(74,27,240,.45); }
  .cb-copy { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; background: rgba(255,255,255,.08); border: none; color: #E6E1F5; font-family: inherit; font-size: 12px; font-weight: 700; padding: 6px 11px; border-radius: 7px; cursor: pointer; }
  .cb-copy:hover { background: rgba(255,255,255,.16); }
  .cb-copy svg { width: 13px; height: 13px; }
  .cb-pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-size: 13px; line-height: 1.7; color: #E6E1F5; white-space: pre; }
  .j-key { color: #AFA0FA; } .j-str { color: #86EFAC; } .j-num { color: #FCD34D; } .j-bool { color: #7DD3FC; } .j-com { color: #7E76A3; } .j-fn { color: #93C5FD; }

  .callout { display: flex; gap: 12px; background: var(--primary-50); border: 1px solid #E4DCFB; border-radius: 12px; padding: 14px 16px; margin: 18px 0; }
  .callout svg { width: 18px; height: 18px; color: var(--primary); flex-shrink: 0; margin-top: 1px; }
  .callout div { font-size: 13.5px; color: var(--primary-700); line-height: 1.55; }

  .pill { display: inline-flex; align-items: center; gap: 5px; padding: 2px 9px; border-radius: 20px; font-size: 12px; font-weight: 700; }
  .pill.ok { background: var(--green-bg); color: var(--green); }
  .pill.risky { background: var(--amber-bg); color: var(--amber); }
  .pill.bad { background: var(--red-bg); color: var(--red); }
  .pill.neutral { background: var(--slate-bg); color: var(--slate); }

  .step-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 18px 0; }
  .step-card { background: var(--surface); border: 1px solid var(--border); border-radius: 13px; padding: 18px; }
  .step-num { width: 30px; height: 30px; border-radius: 50%; background: var(--grad); color: #fff; font-weight: 800; font-size: 13px; display: grid; place-items: center; margin-bottom: 12px; }
  .step-card h4 { font-size: 14.5px; font-weight: 700; }
  .step-card p { font-size: 13px; margin-top: 5px; }

  @media (max-width: 880px) {
    .shell { display: block; width: 100%; }
    .sidebar {
      position: sticky;
      top: 64px;
      z-index: 30;
      display: flex;
      width: 100%;
      height: auto;
      gap: 6px;
      padding: 10px 14px;
      overflow-x: auto;
      overflow-y: hidden;
      background: rgba(246,245,251,.96);
      border-bottom: 1px solid var(--border);
      backdrop-filter: blur(8px);
      -webkit-overflow-scrolling: touch;
    }
    .nav-group { display: flex; flex-shrink: 0; gap: 4px; margin: 0; }
    .nav-group-t { display: none; }
    .nav-link { min-height: 40px; padding: 8px 12px; white-space: nowrap; }
    .content { width: 100%; padding: 28px 22px 90px; overflow: hidden; }
    .step-cards { grid-template-columns: 1fr; }
    table { display: block; width: 100%; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .cb-tabs { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .cb-tab, .cb-copy { min-height: 38px; flex-shrink: 0; }
  }

  @media (max-width: 520px) {
    .topbar { height: 60px; padding: 0 14px; gap: 10px; }
    .docs-logo-img { width: min(130px, 100%); height: auto; }
    .doc-badge { display: none; }
    .back-link { font-size: 0; width: 40px; height: 40px; justify-content: center; }
    .back-link svg { width: 19px; height: 19px; }
    .sidebar { top: 60px; padding: 8px 10px; }
    .content { padding: 24px 14px 72px; }
    h1 { font-size: 28px; }
    h2 { align-items: flex-start; font-size: 21px; }
    h2 .h-ic { flex-shrink: 0; }
    .lead { font-size: 15px; }
    .endpoint, .callout { padding: 12px; }
    .code-block { margin-left: 0; margin-right: 0; }
    .cb-pre { padding: 14px; font-size: 12px; }
  }