/* Coastal Traffic Authority — Data Observatory Dashboard.
 *
 * Pure CSS, no frameworks. Tokens mirror the JS/Canvas surface colours so the
 * canvas overlays (focus glow, accent axes) and the DOM chrome look identical.
 */

:root {
  --bg:       #0e1117;
  --panel:    #161b22;
  --panel-hd: #1a202c;
  --border:   #30363d;
  --text:     #e6edf3;
  --sub:      #8b949e;
  --muted:    #484f58;
  --accent:   #2ec4b6;
  --ring:     #58a6ff;
  --green:    #4caf50;
  --yellow:   #ffc107;
  --orange:   #ff9800;
  --red:      #e03838;
  --chip-off: #21262d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

body { min-height: 100vh; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Header ---- */

header.main-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px;
  background: var(--panel-hd);
  border-bottom: 1px solid var(--border);
}
header.main-header h1 {
  margin: 0; font-size: 18px; font-weight: 600; letter-spacing: 0.02em;
}
header.main-header h1 small {
  font-size: 12px; color: var(--sub); font-weight: 400; margin-left: 8px;
}
.header-actions { display: flex; gap: 8px; align-items: center; }

/* ---- Buttons / chips ---- */

button, .btn {
  background: var(--chip-off);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 10px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
button:not(:disabled):hover, .btn:hover { background: #262c36; border-color: #484f58; }
button:not(:disabled):active, .btn:active { background: #1f252e; }
button[disabled] { opacity: 0.4; cursor: default; }
button.accent { border-color: var(--accent); color: var(--accent); }
button.accent:hover { background: rgba(46, 196, 182, 0.12); }

.btn { cursor: pointer; }
.btn[disabled] { opacity: 0.4; cursor: default; }

/* Filter bar */

.filter-bar {
  display: flex; flex-direction: column; gap: 6px;
  padding: 8px 20px;
  background: var(--panel-hd);
  border-bottom: 1px solid var(--border);
}
.filter-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.filter-label {
  font-size: 12px; font-weight: 600; color: var(--sub);
  min-width: 130px; text-transform: uppercase; letter-spacing: 0.05em;
}
.filter-cells { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; flex: 1; }

.chip {
  font-size: 12px; padding: 3px 9px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--chip-off);
  color: var(--sub); cursor: pointer; min-width: 28px; text-align: center;
  transition: all 0.12s;
}
.chip.active { color: var(--accent); border-color: var(--accent); background: rgba(46, 196, 182, 0.1); }
.chip.icon { min-width: auto; padding: 3px 8px; }
.chip:focus-visible, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--ring); outline-offset: 2px;
}

.filter-select {
  background: var(--chip-off); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 4px 8px; font-size: 13px; font-family: inherit;
}
.mon-input {
  width: 64px; background: var(--chip-off); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 4px 6px; font-size: 13px; font-family: inherit;
  text-align: center;
}
.mon-hint { font-size: 12px; color: var(--sub); }

.record-count { color: var(--accent); font-size: 14px; }

/* Cross-filter notes (asserted as CSS class `.dimmed` on affected panels) */

.filter-notes {
  font-size: 11px; color: var(--sub); padding: 4px 0;
  display: flex; gap: 14px; flex-wrap: wrap;
}
.panel-note { font-family: Consolas, monospace; }
.panel-note::before { content: '•'; color: var(--accent); margin-right: 4px; }

/* ---- Panels grid ---- */

main.dashboard {
  padding: 16px 20px 80px;
}
.panels-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: 12px;
}
/* Spanning: area is top-left, distribution is full-width at bottom. */
.panel--area     { grid-column: 1; grid-row: 1; }
.panel--scatter  { grid-column: 2; grid-row: 1; }
.panel--calendar { grid-column: 1; grid-row: 2; }
.panel--bar      { grid-column: 2; grid-row: 2; }
.panel--dist     { grid-column: 1 / span 2; grid-row: 3; }

/* ---- Panel chrome ---- */

.panel {
  background: var(--panel);
  border-radius: 6px;
  overflow: hidden;
  display: flex; flex-direction: column;
  position: relative;
}
.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 12px;
  background: var(--panel-hd);
  border-bottom: 1px solid var(--border);
}
.panel-header h2 {
  margin: 0; font-size: 13px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--sub);
}
.panel-header .panel-sr {
  font-size: 11px; color: var(--muted); font-style: italic;
  max-width: 60%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.panel-body {
  flex: 1; position: relative; overflow: hidden;
  min-height: 0;
}
.panel-body canvas, .panel-body svg { display: block; }

/* Cross-filter dimming: when the global spec touches this panel, it is
 * dimmed to show that another chart is dominating the current view. */
.panel.dimmed { opacity: 0.62; transition: opacity 0.18s ease; }
.panel.dimmed:hover { opacity: 0.78; }

/* Keyboard focus ring (panel-level) */
.panel.focus-ring::before {
  content: ''; position: absolute; inset: -3px;
  border: 2px solid var(--ring); border-radius: 8px;
  pointer-events: none; z-index: 5;
}

/* ---- Provenance table ---- */

.provenance-panel {
  padding: 8px 20px;
  background: var(--panel-hd);
  border-top: 1px solid var(--border);
}
.provenance-panel h3 {
  margin: 0 0 6px; font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--sub);
}
.prov-table {
  width: 100%; border-collapse: collapse; font-size: 13px;
  table-layout: fixed;
}
.prov-table th {
  text-align: left; font-size: 11px; color: var(--sub);
  padding: 4px 8px; border-bottom: 1px solid var(--border);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.prov-table td {
  padding: 4px 8px; border-bottom: 1px solid var(--border); color: var(--text);
  font-family: Consolas, monospace;
}
.prov-table tr.prov-active td { color: var(--accent); }
.prov-dim { width: 33%; }
.prov-val { width: 40%; }
.prov-src { width: 27%; color: var(--sub); font-size: 11px; }
.prov-foot { font-size: 11px; color: var(--sub); padding-top: 6px; }
.prov-note { margin-bottom: 2px; }

/* ---- Self-test overlay ---- */

.selftest-overlay {
  display: none; position: fixed; inset: 0; z-index: 50;
  background: rgba(14, 17, 23, 0.85);
}
.selftest-overlay.open { display: flex; align-items: flex-start; justify-content: center; padding-top: 60px; }
.selftest-box {
  background: var(--panel); border: 1px solid var(--border); border-radius: 8px;
  width: 720px; max-height: 70vh; overflow-y: auto; padding: 16px 20px;
}
.selftest-box h3 { margin: 0 0 10px; font-size: 15px; }
.selftest-box .summary { font-size: 14px; margin-bottom: 10px; }
.selftest-box .summary.pass { color: var(--green); }
.selftest-box .summary.fail { color: var(--red); }
.st-row { display: flex; gap: 8px; padding: 4px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.st-row .st-icon { width: 20px; text-align: center; }
.st-row .st-name { flex: 1; font-family: Consolas, monospace; }
.st-row .st-detail { color: var(--sub); font-size: 11px; max-width: 45%; }
.st-row.fail .st-icon { color: var(--red); }
.st-row.pass .st-icon { color: var(--green); }

/* ---- Footer ---- */

footer.main-footer {
  position: fixed; left: 0; right: 0; bottom: 0;
  padding: 6px 20px;
  background: var(--panel-hd);
  border-top: 1px solid var(--border);
  font-size: 11px; color: var(--sub);
  display: flex; justify-content: space-between; align-items: center;
  z-index: 10;
}
footer.main-footer .fps-bar { display: flex; gap: 12px; align-items: center; }
footer.main-footer .fps-bar .dot {
  width: 8px; height: 8px; border-radius: 50%; display: inline-block;
  background: var(--green); margin-right: 4px;
}

/* ---- Responsive ---- */

@media (max-width: 960px) {
  .panels-grid { grid-template-columns: 1fr; }
  .panel--area, .panel--scatter, .panel--calendar, .panel--bar, .panel--dist {
    grid-column: 1; grid-row: auto;
  }
  .filter-row { flex-direction: column; align-items: flex-start; }
  .filter-label { min-width: auto; }
  .sr-table-scroller { max-height: 60vh; }
}

/* ---- Alt+T tabular data drawer ---- */

body.alt-table-open .sr-table-drawer { display: flex !important; }
.sr-table-drawer {
  display: none; position: fixed; inset: 0; z-index: 60;
  background: rgba(14, 17, 23, 0.92);
  flex-direction: column;
  padding: 24px 20px 80px;
  overflow-y: auto;
}
.sr-table-header { position: sticky; top: 0; background: var(--bg); z-index: 2; padding-bottom: 8px; }
.sr-table-title { font-size: 16px; margin: 0 0 8px; }
.sr-table-scroller {
  padding: 8px 0;
  font-size: 13px;
  outline: none;
}
.sr-table-section { margin-bottom: 24px; }
.sr-table-section h3 {
  font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--sub); margin: 0 0 6px; padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}
.sr-table-caption { font-size: 12px; color: var(--sub); margin: 0 0 6px; }
.sr-table {
  border-collapse: collapse; font-size: 13px; width: 100%;
  font-variant-numeric: tabular-nums;
}
.sr-table th, .sr-table td {
  padding: 3px 8px; border-bottom: 1px solid var(--border);
  text-align: right; font-family: Consolas, monospace;
}
.sr-table th { color: var(--sub); font-size: 11px; position: sticky; top: 0; background: var(--bg); }
.sr-table tbody tr:hover td { background: rgba(46, 196, 182, 0.06); }
.sr-table .other td { color: var(--accent); }
.sr-table td[data-val] { font-variant-numeric: tabular-nums; }

/* ---- Reduced motion ---- */

@media (prefers-reduced-motion: reduce) {
  .panel.dimmed { transition: none; }
  button, .chip, .filter-select, .mon-input { transition: none; }
  * { animation: none !important; transition: none !important; }
}

.panel [tabindex], .panel[tabindex] {
  outline: none;
}
.panel [tabindex]:focus-visible, .panel[tabindex]:focus-visible,
.panel-header button:focus-visible, .chip:focus-visible,
.filter-select:focus-visible, .mon-input:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

/* ---- Screen-reader-only utility ---- */

.screen-reader-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}