/* CARR OS shared stylesheet.
   Mirrors carrbiosystems.com's live look (verified against style.css + hero, 2026-08-06):
   WHITE canvas, blue-teal ink (#004059 / #006F80 / #005882), ORANGE pop (#FF6928 / #F49838)
   used only as accents (rules, borders, hovers), green kept for positive metrics only.
   Ubuntu + Ubuntu Mono. Authored source; build_carr_os.py copies it to www/assets/. */

  :root {
    --blue: #004059; --blue-light: #006F80; --cerulean: #005882; --navy: #212529;
    --orange: #FF6928; --orange-light: #F49838; --orange-ink: #C2410C;
    --green: #58792E; --red: #B72F14; --amber: #9F6324;
    --tint-blue: #E7EFF2; --tint-green: #EEF3E6; --tint-info: #E6F0F2;
    --tint-red: #F9EAE6; --tint-amber: #FaF1E6; --tint-orange: #FDEFDF;
    --bg: #FFFFFF; --card: #FFFFFF; --card-2: #F7F8FA; --surface-alt: #F7F8FA;
    --ink: #212529; --ink-2: #47515B; --ink-3: #6B7580;
    --line: rgba(33,37,41,0.09); --line-strong: rgba(33,37,41,0.14);
    --gray-100: #F1F3F5; --gray-200: #DDE1E6; --gray-700: #3A424A;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; background: var(--bg); color: var(--ink);
    font-family: 'Ubuntu', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    -webkit-font-smoothing: antialiased; }
  code { font-family: 'Ubuntu Mono', ui-monospace, monospace; font-size: .9em;
    background: var(--gray-100); border: 1px solid var(--line); padding: 1px 5px; border-radius: 4px; }
  a { color: inherit; text-decoration: none; }
  em { font-style: italic; }

  header { position: relative; background: #fff; color: var(--ink);
    padding: 30px 5vw 26px; border-bottom: 1px solid var(--gray-200); }
  .brand-mark { display: inline-block; font-weight: 700; font-size: 12px; letter-spacing: .16em;
    text-transform: uppercase; color: var(--blue); background: #fff;
    border: 1px solid var(--blue); border-radius: 999px; padding: 4px 13px; }
  .back { display: inline-block; margin-left: 8px; font-size: 12px; font-weight: 600;
    color: var(--ink-2); border-bottom: 1px solid var(--gray-200); }
  .back:hover { color: var(--blue); border-bottom-color: var(--orange); }
  h1 { font-size: 29px; font-weight: 700; margin: 16px 0 0; letter-spacing: -.02em; color: var(--blue);
    display: inline-block; }
  h1::after { content: ''; display: block; width: 62px; height: 3px; margin-top: 10px;
    background: var(--orange); border-radius: 2px; }
  .subtitle { font-size: 14px; line-height: 1.65; color: var(--ink-2); max-width: 1000px; margin: 12px 0 14px; }
  .banner { display: inline-block; background: var(--surface-alt); border: 1px solid var(--gray-200);
    border-left: 3px solid var(--orange); border-radius: 9px; padding: 9px 14px; font-size: 12.5px;
    font-weight: 500; color: var(--ink); }

  nav.toc { position: sticky; top: 0; z-index: 20; display: flex; flex-wrap: wrap; gap: 6px 20px;
    background: rgba(255,255,255,.94); backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--gray-200); padding: 11px 5vw; }
  nav.toc a { font-size: 11.5px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
    padding: 3px 0; color: var(--ink-2); border-bottom: 2px solid transparent; }
  nav.toc a:hover { color: var(--blue); border-bottom-color: var(--orange); }

  .section { padding: 30px 5vw 12px; max-width: 1500px; margin: 0 auto; }
  .section-kicker { font-size: 10px; font-weight: 700; letter-spacing: .13em; text-transform: uppercase;
    color: var(--blue-light); }
  .section-title { font-size: 23px; font-weight: 700; margin: 6px 0 9px; letter-spacing: -.015em; color: var(--blue);
    display: inline-block; }
  .section-title::after { content: ''; display: block; width: 40px; height: 3px; margin-top: 7px;
    background: var(--orange); border-radius: 2px; }
  .section-sub { font-size: 13.5px; line-height: 1.7; color: var(--ink-2); max-width: 1010px; margin: 0 0 20px; }

  .grid { display: grid; gap: 14px; margin-bottom: 12px; }
  .cols-4 { grid-template-columns: repeat(4,1fr); }
  .cols-3 { grid-template-columns: repeat(3,1fr); }
  .cols-2 { grid-template-columns: repeat(2,1fr); }

  .card { display: flex; flex-direction: column; gap: 6px; background: var(--card);
    border: 1px solid var(--line); border-radius: 8px; padding: 16px 18px;
    box-shadow: 0 1px 2px rgba(33,37,41,.05); }
  .card.linkable { cursor: pointer; transition: transform .12s ease, box-shadow .12s ease; }
  .card.linkable { border-top: 3px solid transparent; }
  .card.linkable:hover { transform: translateY(-2px); border-top-color: var(--orange);
    box-shadow: 0 8px 22px rgba(0,64,89,.12), 0 0 0 .5px rgba(0,0,0,.05); }
  .card-eyebrow { font-size: 9.5px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase;
    color: var(--blue-light); }
  .card-title { font-size: 15px; font-weight: 700; color: var(--blue); }
  .card-body { font-size: 12.6px; line-height: 1.58; color: var(--ink-2); }
  .card-meta { font-size: 11px; color: var(--ink-3); margin-top: 2px; }
  .arrow-hint { font-size: 11px; font-weight: 700; color: var(--orange-ink); margin-top: 3px; }

  .stat-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
  .stat { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--blue);
    border-radius: 8px; padding: 12px 17px; min-width: 128px; }
  .stat .n { font-size: 25px; font-weight: 700; color: var(--blue); line-height: 1.1;
    font-family: 'Ubuntu Mono', ui-monospace, monospace; font-variant-numeric: tabular-nums; }
  .stat .l { font-size: 10.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
    color: var(--ink-3); margin-top: 3px; }
  .stat.accent { border-left-color: var(--orange); }
  .stat.green { border-left-color: var(--green); } .stat.green .n { color: var(--green); }
  .stat.info  { border-left-color: var(--blue-light); }  .stat.info .n  { color: var(--blue-light); }
  .stat.amber { border-left-color: var(--amber); } .stat.amber .n { color: var(--amber); }
  .stat.red   { border-left-color: var(--red); }   .stat.red .n   { color: var(--red); }

  .flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 8px; margin-bottom: 16px; }
  .flow-node { flex: 1; min-width: 150px; background: var(--card); border: 1.5px solid var(--tint-blue);
    border-radius: 8px; padding: 13px 15px; }
  .flow-node .fn-t { font-size: 13px; font-weight: 700; color: var(--blue); }
  .flow-node .fn-s { font-size: 11.5px; line-height: 1.48; color: var(--ink-2); margin-top: 3px; }
  .flow-arrow { align-self: center; font-size: 17px; color: var(--orange); font-weight: 700; }
  .flow-back { font-size: 11.5px; font-weight: 600; color: var(--blue); background: var(--tint-info);
    border-radius: 8px; padding: 10px 14px; margin-bottom: 18px; }

  table.t { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 8px;
    overflow: hidden; border: 1px solid var(--line); margin-bottom: 18px; }
  table.t th, table.t td { text-align: left; padding: 10px 14px; font-size: 12.4px;
    border-bottom: 1px solid var(--line); vertical-align: top; }
  table.t th { background: var(--cerulean); color: #fff; font-size: 10px;
    text-transform: uppercase; letter-spacing: .07em; font-weight: 700; }
  table.t tr:last-child td { border-bottom: none; }
  table.t td.num { font-family: 'Ubuntu Mono', ui-monospace, monospace; font-variant-numeric: tabular-nums; }
  table.t tr.hidden { display: none; }

  .tag { font-size: 9.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
    padding: 3px 8px; border-radius: 4px; display: inline-block; white-space: nowrap; }
  .tag.live { background: var(--green); color: #fff; }
  .tag.partial { background: var(--amber); color: #fff; }
  .tag.broken { background: var(--red); color: #fff; }
  .tag.designed { background: var(--gray-200); color: var(--gray-700); }
  .tag.accent { background: var(--orange); color: var(--navy); }

  .callout { border-left: 4px solid var(--blue); background: var(--tint-blue); border-radius: 8px;
    padding: 13px 16px; font-size: 12.8px; line-height: 1.62; margin-bottom: 16px; color: var(--ink); }
  .callout.red { border-left-color: var(--red); background: var(--tint-red); }
  .callout.green { border-left-color: var(--green); background: var(--tint-green); }
  .callout.amber { border-left-color: var(--amber); background: var(--tint-amber); }
  .callout.accent { border-left-color: var(--orange); background: var(--tint-orange); }
  .callout strong { font-weight: 700; }

  .footer-note { padding: 24px 5vw 48px; font-size: 12px; color: var(--ink-3); line-height: 1.8;
    border-top: 1px solid var(--line-strong); max-width: 1500px; margin: 26px auto 0; }

  @media (max-width: 1100px) { .cols-4, .cols-3 { grid-template-columns: repeat(2,1fr) !important; } }
  @media (max-width: 700px) { .cols-4, .cols-3, .cols-2 { grid-template-columns: 1fr !important; } }