:root {
        color-scheme: light dark;
        --bg: #F8FAFC;
        --fg: #0E213A;
        --muted: #5B6B84;
        --rule: #E2E8F0;
        --accent: #2563EB;
        --card: #FFFFFF;
      }
      @media (prefers-color-scheme: dark) {
        :root {
          --bg: #0A1524;
          --fg: #E6EDF7;
          --muted: #8FA1BA;
          --rule: #1F3556;
          --accent: #7AB0FF;
          --card: #0E213A;
        }
      }
      * { box-sizing: border-box; }
      body {
        margin: 0;
        background: var(--bg);
        color: var(--fg);
        font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        -webkit-text-size-adjust: 100%;
      }
      main { max-width: 44rem; margin: 0 auto; padding: 3rem 1.25rem 5rem; }
      h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 0.35rem; letter-spacing: -0.01em; }
      h2 { font-size: 1.18rem; line-height: 1.3; margin: 2.5rem 0 0.6rem; letter-spacing: -0.005em; }
      h3 { font-size: 1rem; margin: 1.6rem 0 0.4rem; }
      p, ul, ol { margin: 0 0 1rem; }
      ul, ol { padding-left: 1.3rem; }
      li { margin-bottom: 0.4rem; }
      a { color: var(--accent); text-underline-offset: 0.15em; }
      .lede { font-size: 1.06rem; color: var(--muted); margin-bottom: 2rem; }
      .meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 2rem; }
      .card {
        background: var(--card);
        border: 1px solid var(--rule);
        border-radius: 12px;
        padding: 1rem 1.25rem;
        margin: 1.5rem 0;
      }
      .card p:last-child, .card ul:last-child { margin-bottom: 0; }
      strong { font-weight: 600; }
      hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0 1.5rem; }
      footer { color: var(--muted); font-size: 0.9rem; }
      dl { margin: 0; }
      dt { font-weight: 600; margin-top: 1rem; }
      dd { margin: 0.15rem 0 0; color: var(--muted); }