:root {
    --bg: #ffffff; --surface: #f4f6fa; --text: #14171f; --muted: #5a6275;
    --accent: #1a73e8; --accent-text: #ffffff; --border: #dde2ec; --ok: #137333;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --bg: #11141b; --surface: #1a1f2a; --text: #eceff6; --muted: #a2abbd;
      --accent: #6aa8ff; --accent-text: #0b1220; --border: #2b3242; --ok: #7bd88f;
    }
  }
  * { box-sizing: border-box; }
  body { margin: 0; background: var(--bg); color: var(--text);
         font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
  .wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
  header.hero { padding: 56px 0 40px; }
  h1 { font-size: clamp(2rem, 6vw, 3rem); line-height: 1.15; margin: 0 0 12px; }
  h2 { font-size: 1.5rem; margin: 48px 0 12px; }
  h3 { font-size: 1.05rem; margin: 0 0 4px; }
  p { margin: 0 0 12px; }
  .lead { font-size: 1.15rem; color: var(--muted); max-width: 40em; }
  .buttons { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0 8px; }
  a.btn { display: inline-block; padding: 12px 20px; border-radius: 10px; text-decoration: none;
          font-weight: 600; border: 1px solid var(--accent); }
  a.primary { background: var(--accent); color: var(--accent-text); }
  a.secondary { color: var(--accent); }
  .small { color: var(--muted); font-size: .9rem; }
  .grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
  .card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
  .card p { color: var(--muted); margin: 0; }
  table { width: 100%; border-collapse: collapse; background: var(--surface);
          border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
  th, td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--border); }
  th { font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
  tr:last-child td { border-bottom: 0; }
  td.perm { font-weight: 600; white-space: nowrap; }
  .tag { display: inline-block; font-size: .75rem; padding: 1px 8px; border-radius: 99px;
         border: 1px solid var(--border); color: var(--muted); margin-left: 6px; font-weight: 500; }
  ol { padding-left: 1.3em; } li { margin-bottom: 6px; }
  details { background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
            padding: 12px 16px; margin-bottom: 10px; }
  summary { cursor: pointer; font-weight: 600; }
  details p { margin: 10px 0 0; color: var(--muted); }
  code { background: var(--surface); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; }
  footer { margin: 56px 0 40px; padding-top: 20px; border-top: 1px solid var(--border); }
  a { color: var(--accent); }
  @media (max-width: 560px) { td.perm { white-space: normal; } }
  nav.site { display: flex; flex-wrap: wrap; gap: 4px 18px; padding: 16px 0 0; font-weight: 600; }
  nav.site a { text-decoration: none; }
  nav.site a[aria-current="page"] { color: var(--text); }
  .page-title { padding: 28px 0 8px; }
  .callout { background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent);
             border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
  .callout p { margin: 0; color: var(--muted); }
  .steps > li { margin-bottom: 14px; }


  /* Screenshot gallery: swipeable row on phones, three side-by-side cards on wider screens. */
  .shots { display: flex; gap: 16px; overflow-x: auto; scroll-snap-type: x mandatory;
           padding: 4px 0 12px; margin-top: 12px; -webkit-overflow-scrolling: touch; }
  .shots figure { flex: 0 0 min(250px, 72%); scroll-snap-align: start; margin: 0;
                  background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 10px; }
  .shots img { width: 100%; height: auto; display: block; border-radius: 10px; }
  .shots figcaption { font-size: .9rem; color: var(--text); margin: 10px 4px 4px; line-height: 1.4; }
  @media (min-width: 720px) {
    .shots { display: grid; grid-template-columns: repeat(3, 1fr); overflow: visible; }
    .shots figure { flex: none; }
  }
  .shot-single { max-width: 260px; margin: 12px 0 20px; }
  .shot-single img { width: 100%; height: auto; display: block; border-radius: 16px; border: 1px solid var(--border); }
  .shot-single figcaption { font-size: .9rem; color: var(--muted); margin-top: 8px; }