:root {
      --bg: #FAFAF8;
      --text: #141414;
      --muted: #5A5A56;
      --border: #E4E4E0;
      --code-bg: #F0F0EC;
      --link: #1C97F7;
      --link-hover: #0D7AD4;
      --max: 42rem;
      --logo-y: #FDC204;
      --logo-o: #F09020;
      --logo-g: #25D874;
      --logo-b: #1C97F7;
      --logo-m: #C2186A;
    }

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

    html {
      -webkit-text-size-adjust: 100%;
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background: var(--bg);
      color: var(--text);
      font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      font-size: 1.0625rem;
      line-height: 1.65;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--link);
      text-decoration: underline;
      text-underline-offset: 0.15em;
    }
    a:hover { color: var(--link-hover); }

    code, .mono {
      font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
      font-size: 0.9em;
    }

    /* Header */
    .site-header {
      border-bottom: 1px solid var(--border);
      background: #FFFFFF;
    }

    .site-header-inner {
      max-width: var(--max);
      margin: 0 auto;
      padding: 1rem 1.25rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 0.65rem;
      color: var(--text);
      text-decoration: none;
      font-weight: 600;
      font-size: 0.9375rem;
      letter-spacing: -0.01em;
    }
    .brand:hover { color: var(--text); }

    .brand img {
      height: 28px;
      width: auto;
      max-height: 28px;
      display: block;
      object-fit: contain;
    }

    .header-nav a {
      color: var(--muted);
      text-decoration: none;
      font-size: 0.875rem;
      font-weight: 500;
    }
    .header-nav a:hover { color: var(--text); }

    .logo-hairline {
      height: 2px;
      width: 100%;
      background: linear-gradient(
        90deg,
        var(--logo-y) 0%,
        var(--logo-o) 25%,
        var(--logo-g) 50%,
        var(--logo-b) 75%,
        var(--logo-m) 100%
      );
    }

    /* Article column */
    main {
      max-width: var(--max);
      margin: 0 auto;
      padding: 2.5rem 1.25rem 4rem;
    }

    h1 {
      margin: 0 0 0.75rem;
      font-size: 1.875rem;
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text);
    }

    .lede {
      margin: 0 0 1.25rem;
      color: var(--text);
      font-size: 1.125rem;
      line-height: 1.6;
    }

    .lede + p {
      margin: 0 0 2rem;
      color: var(--muted);
      font-size: 0.9875rem;
    }

    h2 {
      margin: 2.75rem 0 1rem;
      padding-top: 0.5rem;
      border-top: 1px solid var(--border);
      font-size: 1.375rem;
      line-height: 1.3;
      font-weight: 700;
      letter-spacing: -0.015em;
      color: var(--text);
      scroll-margin-top: 1rem;
    }

    h2:first-of-type { /* first section after contents */ }

    .section-label {
      margin: 1.1rem 0 0.35rem;
      font-size: 0.8125rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      color: var(--muted);
    }

    .section-body {
      margin: 0 0 0.25rem;
      color: var(--text);
    }

    ul, ol {
      margin: 0.35rem 0 0.75rem;
      padding-left: 1.35rem;
    }

    li { margin: 0.3rem 0; }

    li::marker { color: var(--muted); }

    /* Install block */
    pre {
      margin: 0.75rem 0 1rem;
      padding: 0.9rem 1rem;
      background: var(--code-bg);
      border: 1px solid var(--border);
      border-radius: 4px;
      overflow-x: auto;
      font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
      font-size: 0.875rem;
      line-height: 1.5;
      color: var(--text);
    }

    pre code {
      font-size: inherit;
      background: none;
      padding: 0;
    }

    .code-panel {
      margin: 0.5rem 0 1.15rem;
      border: 1px solid var(--border);
      border-radius: 4px;
      background: var(--code-bg);
      overflow: hidden;
    }

    .code-panel-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
      padding: 0.45rem 0.65rem 0.45rem 0.9rem;
      border-bottom: 1px solid var(--border);
      background: #FFFFFF;
    }

    .code-panel-bar span {
      font-size: 0.8125rem;
      color: var(--muted);
      font-weight: 500;
    }

    .copy-btn {
      appearance: none;
      border: 1px solid var(--border);
      background: #FFFFFF;
      color: var(--text);
      font: inherit;
      font-size: 0.8125rem;
      line-height: 1;
      padding: 0.4rem 0.65rem;
      border-radius: 3px;
      cursor: pointer;
    }

    .copy-btn:hover {
      border-color: var(--text);
    }

    .copy-btn:focus-visible {
      outline: 2px solid var(--text);
      outline-offset: 2px;
    }

    .code-panel pre {
      margin: 0;
      border: 0;
      border-radius: 0;
      background: transparent;
      white-space: pre-wrap;
    }

    p code {
      background: var(--code-bg);
      padding: 0.1em 0.35em;
      border-radius: 3px;
      font-size: 0.875em;
      color: var(--text);
    }

    .note {
      margin: 1rem 0 0;
      color: var(--muted);
      font-size: 0.9375rem;
    }

    /* Contents */
    .contents {
      margin: 0 0 2rem;
      padding: 1rem 1.15rem;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: 4px;
    }

    .contents-title {
      margin: 0 0 0.5rem;
      font-size: 0.8125rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      color: var(--muted);
    }

    .contents ol {
      margin: 0;
      padding-left: 1.25rem;
    }

    .contents > ol > li {
      margin: 0.45rem 0;
    }

    .contents ol ol {
      margin: 0.25rem 0 0.35rem;
      padding-left: 1.15rem;
      list-style: disc;
    }

    .contents a {
      color: var(--text);
      text-decoration: none;
    }
    .contents a:hover {
      color: var(--link);
      text-decoration: underline;
    }

    /* Footer */
    .site-footer {
      max-width: var(--max);
      margin: 0 auto;
      padding: 0 1.25rem 3rem;
      border-top: 1px solid var(--border);
      padding-top: 1.5rem;
    }

    .site-footer p {
      margin: 0 0 0.5rem;
      font-size: 0.875rem;
      color: var(--muted);
      line-height: 1.55;
    }

    .site-footer a { color: var(--muted); }
    .site-footer a:hover { color: var(--text); }

    @media (max-width: 520px) {
      h1 { font-size: 1.625rem; }
      .lede { font-size: 1.05rem; }
      main { padding-top: 1.75rem; }
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      gap: 0.1rem;
      line-height: 1.15;
    }
    .brand-name {
      font-weight: 600;
      font-size: 0.9375rem;
      letter-spacing: -0.01em;
      color: var(--text);
    }
    .brand-tagline {
      font-weight: 500;
      font-size: 0.6875rem;
      letter-spacing: 0.01em;
      color: var(--muted);
    }
    .brand { align-items: center; }
    .legal-meta {
      font-size: 0.875rem;
      color: var(--muted);
      margin: 0 0 1.5rem;
      line-height: 1.55;
    }
    .legal-box {
      margin: 1.25rem 0;
      padding: 1rem 1.1rem;
      border: 1px solid var(--border);
      border-radius: 6px;
      background: #FAFAF8;
    }
    .legal-box p { margin: 0; }
    .muted { color: var(--muted); font-size: 0.9375rem; }
    .section-label { /* already in homepage */ }
    h2 {
      margin: 2rem 0 0.75rem;
      font-size: 1.25rem;
      font-weight: 650;
      letter-spacing: -0.015em;
    }
    h3 {
      margin: 1.25rem 0 0.5rem;
      font-size: 1.05rem;
      font-weight: 600;
    }
    ul { margin: 0 0 1rem; padding-left: 1.25rem; }
    li { margin: 0.35rem 0; }
    .ids {
      display: grid;
      gap: 0.75rem;
      margin: 1rem 0 1.5rem;
    }
    @media (min-width: 640px) {
      .ids { grid-template-columns: repeat(3, 1fr); }
    }
    .id-card {
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 0.9rem 1rem;
      background: #FAFAF8;
    }
    .id-card .kicker {
      margin: 0 0 0.35rem;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--muted);
    }
    .id-card h3 { margin: 0 0 0.35rem; font-size: 1.05rem; }
    .id-card p { margin: 0; font-size: 0.875rem; color: var(--muted); }