/* DOS web layer — load AFTER dos.css. Rules in ../DESIGN.md §7–§10.
   Semantic tokens (--bg, --surface, --text…) map onto the --dos-* brand tokens and flip in dark mode;
   components below only use the semantic ones. No site footer, by design (§7). */

:root {
  --bg: var(--dos-paper);
  --surface: var(--dos-white);
  --text: var(--dos-ink);
  --muted: var(--dos-muted);
  --line: var(--dos-gray);
  --line-soft: var(--dos-gray-1);
  --alert: var(--dos-alert);
  --focus: var(--dos-ink);
  color-scheme: light;
}
/* Dark: same monochrome, inverted. Alert lightens to keep >=4.5:1 on the dark surface. */
:root[data-theme="dark"] {
  --bg: #161616; --surface: #222222; --text: #F1F1F1; --muted: #A8A8A8;
  --line: #3D3D3D; --line-soft: #2C2C2C; --alert: #FF6B6B; --focus: #F1F1F1; color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161616; --surface: #222222; --text: #F1F1F1; --muted: #A8A8A8;
    --line: #3D3D3D; --line-soft: #2C2C2C; --alert: #FF6B6B; --focus: #F1F1F1; color-scheme: dark;
  }
}

body { background: var(--bg); color: var(--text); }
a { color: inherit; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.sr-only { position: absolute !important; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---- Shell: sticky header, content scrolls forever, no footer ---- */
.dos-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 24px; min-height: 64px; padding: 0 32px; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.dos-header .dos-mark { font-size: 18px; text-decoration: none; }
.dos-nav { display: flex; gap: 4px; flex: 1; overflow-x: auto; }
.dos-nav a, .dos-header-tools a, .dos-header-tools button { padding: 8px 12px; font: 500 13px/1 var(--dos-font); letter-spacing: .02em; text-decoration: none; color: var(--muted); background: none; border: 0; cursor: pointer; }
.dos-nav a[aria-current="page"], .dos-nav a:hover, .dos-header-tools a:hover, .dos-header-tools button:hover { color: var(--text); }
.dos-nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--text); }
.dos-header-tools { display: flex; align-items: center; gap: 4px; }
.dos-main { max-width: 1200px; margin: 0 auto; padding: 32px 32px 96px; }
.dos-title { margin: 8px 0 4px; }
.dos-subtitle { margin: 0 0 24px; color: var(--muted); }

/* ---- Surfaces ---- */
.dos-panel { margin: 0 0 16px; padding: 24px; background: var(--surface); border: 1px solid var(--line-soft); }
.dos-panel > h2:first-child, .dos-panel > .dos-eyebrow + h2 { margin-top: 0; }
.dos-panel h2 { font-size: 24px; }
.dos-eyebrow { margin: 0 0 8px; font-size: 10px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.dos-help { font-size: 12px; color: var(--muted); }
.dos-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }

/* ---- Buttons and form controls ---- */
.dos-btn { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 18px; font: 500 14px/1 var(--dos-font); color: var(--bg); background: var(--text); border: 1px solid var(--text); cursor: pointer; text-decoration: none; }
.dos-btn.is-quiet { color: var(--text); background: transparent; }
.dos-btn:disabled { opacity: .5; cursor: not-allowed; }
input, select, textarea { font: 400 14px/1.3 var(--dos-font); color: var(--text); background: var(--surface); border: 1px solid var(--line); border-radius: 0; min-height: 36px; padding: 6px 10px; }
label { font-size: 12px; font-weight: 500; color: var(--muted); }

/* ---- Status tag: label is always written; colour only reinforces it (DESIGN.md §2) ---- */
.dos-tag { display: inline-block; padding: 2px 8px; font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; color: var(--muted); border: 1px solid var(--line); }
.dos-tag.is-warn { color: var(--text); border-color: var(--text); }
.dos-tag.is-alert { color: var(--alert); border-color: var(--alert); }
.dos-status { margin: 12px 0; padding: 0; list-style: none; }
.dos-status li { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; padding: 12px 0; border-top: 1px solid var(--line-soft); }
.dos-status li > .dos-help { flex-basis: 100%; margin: 0; }

/* ---- Tables: DataTables skin (DESIGN.md §8). Horizontal rules only, uppercase header ---- */
.dos-filters { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 12px; }
.dos-filters label { display: grid; gap: 4px; min-width: 160px; }
table.dataTable { width: 100% !important; border-collapse: collapse; font-size: 14px; }
table.dataTable > thead > tr > th { padding: 0 12px 8px 0 !important; font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); border-bottom: 1px solid var(--text) !important; text-align: left; }
table.dataTable > tbody > tr > td { padding: 11px 12px 11px 0 !important; border-top: 1px solid var(--line-soft) !important; vertical-align: top; }
table.dataTable > tbody > tr:hover > td { background: color-mix(in srgb, var(--text) 4%, transparent); }
table.dataTable td.num, table.dataTable th.num, table.dataTable td.dt-type-numeric { text-align: right; font-variant-numeric: tabular-nums; }
table.dataTable.no-footer { border-bottom: 0 !important; }
div.dt-container { color: var(--text); }
div.dt-container .dt-layout-row { gap: 16px; align-items: center; }
div.dt-container .dt-search, .dt-container .dt-length { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
div.dt-container .dt-search input { width: 220px; margin: 0 !important; border-radius: 0 !important; border: 1px solid var(--line) !important; background: var(--surface) !important; color: var(--text) !important; }
div.dt-container .dt-length select { margin: 0 !important; border-radius: 0 !important; background: var(--surface) !important; color: var(--text) !important; }
div.dt-container .dt-info { font-size: 12px; color: var(--muted) !important; }
div.dt-container .dt-paging nav { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 4px; }
div.dt-container .dt-paging .dt-paging-button { min-width: 34px; min-height: 34px; margin: 0 !important; padding: 6px 10px !important; border: 1px solid var(--line-soft) !important; border-radius: 0 !important; background: none !important; color: var(--text) !important; }
div.dt-container .dt-paging .dt-paging-button.current, div.dt-container .dt-paging .dt-paging-button.current:hover { background: var(--text) !important; color: var(--bg) !important; border-color: var(--text) !important; }
div.dt-container .dt-paging .dt-paging-button:hover:not(.disabled) { border-color: var(--text) !important; }
div.dt-container .dt-paging .dt-paging-button.disabled, div.dt-container .dt-paging .dt-paging-button.disabled:hover { color: var(--muted) !important; opacity: .5; }

/* ---- Info page: changelog, release heatmap (DESIGN.md §9) ---- */
.dos-changelog ol { margin: 0; padding: 0; list-style: none; }
.dos-changelog li { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 14px 0; border-top: 1px solid var(--line-soft); }
.dos-changelog time { font-size: 12px; color: var(--muted); }
.dos-changelog li p { margin: 4px 0 0; font-size: 14px; color: var(--muted); }
.dos-changelog summary { display: flex; align-items: center; gap: 10px; list-style: none; cursor: pointer; }
.dos-changelog summary::-webkit-details-marker { display: none; }
.dos-changelog summary h2 { margin: 0; }
.dos-changelog summary::before { content: ""; width: 8px; height: 8px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(-45deg); transition: transform .15s ease; }
.dos-changelog details[open] summary::before { transform: rotate(45deg); }
.dos-hm { display: grid; grid-template-columns: auto 1fr; gap: 4px 6px; width: max-content; max-width: 100%; margin: 12px 0; overflow-x: auto; }
.dos-hm-months { grid-column: 2; display: grid; grid-template-columns: repeat(var(--cols), 14px); gap: 3px; font-size: 10px; color: var(--muted); }
.dos-hm-months span { white-space: nowrap; }
.dos-hm-wd { display: grid; grid-template-rows: repeat(7, 14px); gap: 3px; font-size: 9px; color: var(--muted); align-items: center; }
.dos-hm-grid { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 14px); grid-auto-columns: 14px; gap: 3px; }
.dos-hm-cell { position: relative; width: 14px; height: 14px; background: var(--line-soft); }
.dos-hm-cell.lvl-1 { background: color-mix(in srgb, var(--text) 25%, var(--surface)); }
.dos-hm-cell.lvl-2 { background: color-mix(in srgb, var(--text) 45%, var(--surface)); }
.dos-hm-cell.lvl-3 { background: color-mix(in srgb, var(--text) 70%, var(--surface)); }
.dos-hm-cell.lvl-4 { background: var(--text); }
.dos-hm-cell[tabindex]:focus-visible { outline-offset: 1px; }
.dos-hm-pop { display: none; position: absolute; z-index: 5; left: 50%; bottom: calc(100% + 6px); transform: translateX(-50%); width: max-content; max-width: 280px; padding: 10px 12px; font-size: 12px; line-height: 1.4; color: var(--bg); background: var(--text); }
.dos-hm-pop ul { margin: 4px 0 0; padding-left: 16px; }
.dos-hm-cell:hover .dos-hm-pop, .dos-hm-cell:focus .dos-hm-pop { display: block; }
.dos-hm-legend { display: flex; align-items: center; gap: 4px; font-size: 10px; color: var(--muted); }
.dos-hm-legend .dos-hm-cell { width: 10px; height: 10px; }

@media (max-width: 700px) {
  .dos-header { padding: 0 16px; gap: 12px; }
  .dos-main { padding: 20px 16px 72px; }
  .dos-panel { padding: 16px; }
  .dos-changelog li { grid-template-columns: 1fr; gap: 4px; }
  .dt-container .dt-search input { width: 100%; }
  .dt-container .dt-paging nav { justify-content: center; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; } }
@media print { .dos-header, .dt-container .dt-search, .dt-container .dt-length, div.dt-container .dt-paging, .dos-filters { display: none !important; } }