/* ==========================================================================
   INOVI Tilt Monitor — shared design system
   Engineering-instrument aesthetic: hairline panels, corner tick marks,
   blueprint grid, mono data readouts. Matches companion desktop app tone,
   restyled as a technical instrument panel rather than a generic dark UI.
   ========================================================================== */

:root {
  --bg: #18191B;
  --bg-1: #1D1E20;
  --bg-2: #222326;
  --bg-3: #292A2D;
  --bg-elev: #303134;

  --border: #2B2C2F;
  --border-2: #36373A;
  --border-soft: #232427;

  --fg: #F2F2F3;
  --fg-2: #C7C8CA;
  --fg-3: #8A8B8E;
  --fg-4: #5A5B5E;

  --accent: #F2F2F3;
  --accent-2: #C7C8CA;

  --ok: #E5E5E6;
  --warn: #B8B9BB;
  --err: #8A8B8E;
  --info: #C7C8CA;

  --chan-x: #F2F2F3;
  --chan-y: #9FA0A2;
  --chan-z: #6E6F72;

  --on-accent: #18191B;

  /* app-specific severity accents (restrained, NOT used elsewhere) */
  --severity-ok: #5A5B5E;
  --severity-warn: #D4A94A;
  --severity-crit: #B85C5C;

  /* sharp, instrument-panel geometry — square corners everywhere */
  --radius-sm: 2px;
  --radius-md: 2px;
  --radius-lg: 2px;

  /* corner tick-mark color + blueprint grid line color (near-invisible) */
  --tick: var(--border-2);
  --grid-line: rgba(255, 255, 255, 0.035);
  --grid-cell: 24px;

  --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

/* ==========================================================================
   Light theme override — activated via data-theme="light" on <html>,
   toggled by js/theme.js and persisted in sessionStorage. All chrome
   colors are CSS vars, so this single block re-themes the whole app.
   Severity red is unchanged across themes; amber is darkened slightly for
   contrast against a white background. Light theme reads as blueprint
   paper: white ground, faint grid, dark hairlines.
   ========================================================================== */
[data-theme="light"] {
  --bg: #FFFFFF;
  --bg-1: #FAFAFA;
  --bg-2: #F4F4F5;
  --bg-3: #ECECEE;
  --bg-elev: #E4E4E7;

  --border: #E4E4E7;
  --border-2: #D4D4D8;
  --border-soft: #EFEFF1;

  --fg: #18191B;
  --fg-2: #3F4044;
  --fg-3: #6E6F72;
  --fg-4: #A1A2A5;

  --accent: #18191B;
  --accent-2: #3F4044;

  --ok: #3F4044;
  --warn: #6E6F72;
  --err: #6E6F72;
  --info: #3F4044;

  --chan-x: #18191B;
  --chan-y: #3F4044;
  --chan-z: #6E6F72;

  --on-accent: #FFFFFF;

  /* Severity amber darkened for legibility on a white background; red is
     kept the same in both themes. */
  --severity-warn: #B8860B;

  --grid-line: rgba(24, 25, 27, 0.035);
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  background-color: var(--bg);
  /* Blueprint grid — ~24px cells at 3.5% opacity, present in both themes. */
  background-image:
    repeating-linear-gradient(0deg, var(--grid-line) 0, var(--grid-line) 1px, transparent 1px, transparent var(--grid-cell)),
    repeating-linear-gradient(90deg, var(--grid-line) 0, var(--grid-line) 1px, transparent 1px, transparent var(--grid-cell));
  color: var(--fg);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

/* ---------- generic label / heading conventions ---------- */

.label,
.section-title,
th {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  color: var(--fg-3);
  font-weight: 600;
  font-family: var(--font-mono);
}

/* Numbered technical section labels — "01 / VISUALIZATION" style, with a
   thin rule extending to the right of the text (the recurring signature
   detail used across every panel header on the page). */
.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  margin: 0 0 14px 0;
  color: var(--fg-3);
  white-space: nowrap;
}

.section-title::after {
  content: '';
  flex: 1 1 auto;
  height: 1px;
  background: var(--border-2);
  min-width: 12px;
}

/* Same treatment applied to the explanation panel's <summary>, via an
   inline numbered-label span (see dashboard.html). */
.section-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fg-3);
  margin-right: 10px;
}

/* ---------- buttons / inputs ---------- */

button {
  font-family: inherit;
  cursor: pointer;
}

input,
select,
button {
  font-size: 14px;
}

.btn {
  background: var(--bg-3);
  border: 1px solid var(--border-2);
  color: var(--fg);
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: background 0.1s ease, border-color 0.1s ease;
}

.btn:hover {
  background: var(--bg-elev);
  border-color: var(--fg-4);
}

.btn:active {
  background: var(--bg-2);
}

.btn-primary {
  background: var(--fg);
  color: var(--on-accent);
  border: 1px solid var(--fg);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--fg-2);
  border-color: var(--fg-2);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--fg-2);
}

.btn-ghost:hover {
  background: var(--bg-2);
}

/* Segmented technical control (range toggles) — a single bordered strip
   with hairline dividers between options, not individually-boxed pills. */
.btn-toggle {
  background: var(--bg-1);
  border: none;
  border-right: 1px solid var(--border-2);
  color: var(--fg-3);
  padding: 7px 13px;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.btn-toggle:last-child {
  border-right: none;
}

.btn-toggle.active {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--on-accent);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field input,
.field select {
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  color: var(--fg);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  outline: none;
  font-family: var(--font-mono);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.field input:focus,
.field select:focus {
  border-color: var(--fg-4);
  background: var(--bg-3);
}

.field input::placeholder {
  color: var(--fg-4);
}

select {
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  color: var(--fg-2);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  outline: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* ---------- cards / panels ---------- */

/* .panel — the primary instrument enclosure. Sharp 2px corners, a single
   hairline border, no blur/shadow softness, and four L-shaped corner tick
   marks baked in via layered backgrounds (no extra markup needed). */
.panel {
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;

  background-image:
    linear-gradient(var(--tick), var(--tick)), linear-gradient(var(--tick), var(--tick)),
    linear-gradient(var(--tick), var(--tick)), linear-gradient(var(--tick), var(--tick)),
    linear-gradient(var(--tick), var(--tick)), linear-gradient(var(--tick), var(--tick)),
    linear-gradient(var(--tick), var(--tick)), linear-gradient(var(--tick), var(--tick));
  background-repeat: no-repeat;
  background-size:
    9px 1px, 1px 9px,
    9px 1px, 1px 9px,
    9px 1px, 1px 9px,
    9px 1px, 1px 9px;
  background-position:
    -1px -1px, -1px -1px,
    calc(100% + 1px) -1px, calc(100% + 1px) -1px,
    -1px calc(100% + 1px), -1px calc(100% + 1px),
    calc(100% + 1px) calc(100% + 1px), calc(100% + 1px) calc(100% + 1px);
}

.card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Login page
   ========================================================================== */

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: transparent;
}

.login-card {
  width: 100%;
  max-width: 380px;
  padding: 40px 36px 36px;
  text-align: center;
}

.login-mark {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 6px;
}

.login-title {
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--fg);
  margin: 0 0 34px 0;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  text-align: left;
}

.login-form label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--fg-3);
  margin-bottom: 2px;
  display: block;
}

.login-form input {
  width: 100%;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  font-variant-numeric: tabular-nums;
  border-radius: var(--radius-sm);
}

.login-error {
  min-height: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--severity-crit);
  text-align: left;
  letter-spacing: 0.01em;
}

.login-footnote {
  margin-top: 28px;
  font-size: 11px;
  color: var(--fg-4);
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.login-fields {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.login-mode-toggle {
  display: block;
  width: 100%;
  margin-top: 18px;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-mono);
  color: var(--fg-3);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-align: center;
  cursor: pointer;
}

.login-mode-toggle:hover {
  color: var(--fg-2);
}

.login-theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 8px 14px;
  font-size: 11px;
}

/* ==========================================================================
   Dashboard shell
   ========================================================================== */

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  gap: 20px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.building-names {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.building-name-th {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.building-name-en {
  font-size: 12px;
  color: var(--fg-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-4);
  border-right: 1px solid var(--border-2);
  padding-right: 14px;
  margin-right: 2px;
  white-space: nowrap;
}

/* Telemetry strip: mono, uppercase, tabular — reads like a live status
   line on an instrument panel rather than a chat-style status badge. */
.status-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-left: 8px;
  font-variant-numeric: tabular-nums;
}

/* Square (not circular) telemetry indicator. */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 1px;
  background: var(--fg-4);
  position: relative;
  flex: none;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 1px;
  border: 1px solid currentColor;
  opacity: 0;
}

.status-dot.live {
  background: #7FBF7F;
  color: #7FBF7F;
}

.status-dot.live::after {
  animation: pulse-ring 1.8s ease-out infinite;
}

.status-dot.stale {
  background: var(--fg-4);
  color: var(--fg-4);
}

.status-dot.offline {
  background: var(--severity-crit);
  color: var(--severity-crit);
}

.status-dot.live.sev-warn {
  background: var(--severity-warn);
  color: var(--severity-warn);
}

.status-dot.live.sev-crit {
  background: var(--severity-crit);
  color: var(--severity-crit);
}

@keyframes pulse-ring {
  0% { opacity: 0.55; transform: scale(1); }
  100% { opacity: 0; transform: scale(2.4); }
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ==========================================================================
   Main layout
   ========================================================================== */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 20px 28px;
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

/* ---------- top row: fixed-size 3D panel + flexible history panel ---------- */

.top-row {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.viz-panel {
  /* Fixed size — does not grow/shrink with the viewport. The Three.js
     renderer is sized once from this fixed footprint (see dashboard.js);
     there is deliberately no resize-driven reflow of the canvas. */
  flex: 0 0 540px;
  width: 540px;
  display: flex;
  flex-direction: column;
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
}

.viz-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

#viz-canvas-wrap {
  flex: none;
  width: 500px;
  height: 560px;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-2);
  border: 1px solid var(--border-soft);
}

#viz-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viz-note {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-3);
  background: var(--bg-1);
  padding: 5px 9px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-soft);
  pointer-events: none;
}

.viz-legend {
  position: absolute;
  right: 14px;
  top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--fg-3);
  background: var(--bg-1);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-soft);
  pointer-events: none;
}

.viz-legend-row {
  display: flex;
  align-items: center;
  gap: 7px;
}

/* Square swatches, not glowing dots. */
.viz-legend-swatch {
  width: 9px;
  height: 9px;
  border-radius: 1px;
  flex: none;
}

/* ---------- visual exaggeration slider ---------- */

.viz-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.viz-slider-row .label {
  margin: 0;
  white-space: nowrap;
}

/* Thin technical track + square thumb, cross-browser. */
.viz-slider-row input[type="range"] {
  flex: 1;
  min-width: 120px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

.viz-slider-row input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--border-2);
}

.viz-slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 1px;
  background: var(--fg-2);
  margin-top: -4px;
  cursor: pointer;
}

.viz-slider-row input[type="range"]::-moz-range-track {
  height: 2px;
  background: var(--border-2);
}

.viz-slider-row input[type="range"]::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: none;
  border-radius: 1px;
  background: var(--fg-2);
  cursor: pointer;
}

.viz-slider-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
  min-width: 42px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---------- second row: building info | floor cards | sensor info ---------- */

.mid-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: start;
}

.floor-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  padding-right: 2px;
  max-height: 620px;
}

/* Instrument channel: flat card, hairline border, 3px full-height severity
   bar on the left edge (in place of a glowing badge). */
.floor-card {
  padding: 14px 16px;
  border-left: 3px solid var(--fg-4);
  transition: border-color 0.15s ease;
}

.floor-card.severity-ok {
  border-left-color: var(--severity-ok);
}

.floor-card.severity-warn {
  border-left-color: var(--severity-warn);
}

.floor-card.severity-crit {
  border-left-color: var(--severity-crit);
}

.floor-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.floor-label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--fg-2);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Flat text tag — [NORMAL] / [WARNING] / [CRITICAL] — no pill, no glow.
   Brackets are added via ::before/::after so the JS-set label text does
   not need to change. */
.floor-severity-badge {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-4);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-2);
  background: transparent;
}

.floor-severity-badge::before {
  content: '[';
}

.floor-severity-badge::after {
  content: ']';
}

.floor-severity-badge.severity-warn {
  color: var(--severity-warn);
  border-color: var(--severity-warn);
}

.floor-severity-badge.severity-crit {
  color: var(--severity-crit);
  border-color: var(--severity-crit);
}

.floor-deviation {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-soft);
}

.floor-deviation-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.floor-card.severity-warn .floor-deviation-value {
  color: var(--severity-warn);
}

.floor-card.severity-crit .floor-deviation-value {
  color: var(--severity-crit);
}

.floor-deviation-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--fg-4);
}

.floor-lateral {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 10px;
}

.floor-lateral-label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--fg-4);
}

.floor-lateral-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
  font-variant-numeric: tabular-nums;
}

.floor-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.floor-metrics-secondary {
  opacity: 0.85;
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-4);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.floor-metrics-secondary .metric-value {
  font-size: 13px;
  color: var(--fg-2);
  font-weight: 400;
}

.metric-value .unit {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-4);
  margin-left: 1px;
}

.empty-note {
  color: var(--fg-4);
  font-size: 12px;
  padding: 20px 4px;
  text-align: center;
}

/* ---------- building info card ---------- */

.building-info-card {
  padding: 18px 18px 16px;
}

.building-info-name {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 12px;
}

.building-info-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.building-info-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
}

.building-info-label {
  font-family: var(--font-mono);
  color: var(--fg-4);
  letter-spacing: 0.02em;
  white-space: nowrap;
  text-transform: uppercase;
  font-size: 10.5px;
}

.building-info-value {
  color: var(--fg-2);
  font-family: var(--font-mono);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---------- sensor info panel ---------- */

.sensor-info-panel {
  padding: 18px 18px 16px;
}

.sensor-info-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.sensor-info-id {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}

.sensor-info-status-badge {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-4);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-2);
  background: transparent;
}

.sensor-info-status-badge::before {
  content: '[';
}

.sensor-info-status-badge::after {
  content: ']';
}

.sensor-info-metrics {
  margin-top: 12px;
  grid-template-columns: repeat(2, 1fr);
}

.sensor-info-body .building-info-grid {
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--border-soft);
}

/* ---------- set-zero / baseline controls ---------- */

.zero-baseline-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 8px;
}

.zero-baseline-row .label {
  margin-right: 2px;
}

.zero-baseline-row input[type="date"],
.zero-baseline-row input[type="datetime-local"],
.custom-range-row input[type="datetime-local"] {
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  color: var(--fg);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  outline: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.baseline-reference-text {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

/* ---------- custom history range controls (Task 5) ---------- */

.custom-range-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 14px;
}

.custom-range-row .label {
  margin: 0 2px 0 0;
}

.custom-range-hint {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--fg-4);
  letter-spacing: 0.02em;
}

.range-window-summary {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  margin: -6px 0 14px;
  letter-spacing: 0.02em;
}

/* ---------- stat chips ---------- */

.stat-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 4px 0 14px;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--fg-4);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 11px;
}

.stat-chip-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---------- threshold toggle ---------- */

.threshold-toggle-row {
  margin-bottom: 10px;
}

.threshold-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--fg-2);
  cursor: pointer;
  user-select: none;
}

.threshold-toggle-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border: 1px solid var(--border-2);
  border-radius: 1px;
  background: var(--bg-2);
  cursor: pointer;
  position: relative;
}

.threshold-toggle-label input[type="checkbox"]:checked {
  background: var(--fg);
  border-color: var(--fg);
}

.threshold-toggle-label input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 3px;
  height: 7px;
  border: solid var(--on-accent);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* ---------- dual history charts ---------- */

.chart-wrap-dual {
  margin-bottom: 18px;
}

.chart-subtitle {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 6px;
}

.chart-wrap-dual .chart-wrap {
  height: 220px;
}

/* ==========================================================================
   History section
   ========================================================================== */

.history-panel {
  flex: 1;
  min-width: 0;
  padding: 20px 24px 24px;
}

.history-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}

.history-controls-left,
.history-controls-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Segmented technical control — a single bordered strip, not gapped pills. */
.range-toggles {
  display: flex;
  gap: 0;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.chart-wrap {
  height: 320px;
  position: relative;
}

/* ---------- severity legend chip row ---------- */

.severity-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

/* Flat tag, not a pill — thin border, square corners. */
.severity-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-2);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 12px 5px 9px;
}

/* Thin vertical flag/bar, not a glowing dot. */
.severity-chip-dot {
  width: 3px;
  height: 13px;
  border-radius: 0;
  flex: none;
}

.severity-chip-ok .severity-chip-dot {
  background: var(--severity-ok);
}

.severity-chip-warn .severity-chip-dot {
  background: var(--severity-warn);
}

.severity-chip-crit .severity-chip-dot {
  background: var(--severity-crit);
}

.chip-range {
  color: var(--fg-4);
  font-family: var(--font-mono);
  font-size: 10px;
  margin-left: 2px;
  font-variant-numeric: tabular-nums;
}

/* ---------- explanation panel ---------- */

.explain-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-2);
  padding: 4px 16px;
}

.explain-panel summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  padding: 12px 0;
  font-family: var(--font-sans);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--fg-2);
  letter-spacing: 0.02em;
}

.explain-panel summary::-webkit-details-marker {
  display: none;
}

.explain-panel summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 8px;
  color: var(--fg-4);
  transition: transform 0.15s ease;
}

.explain-panel[open] summary::before {
  transform: rotate(90deg);
}

.explain-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 2px 0 16px;
}

.explain-item p {
  margin: 0;
  line-height: 1.55;
}

.explain-item p.th {
  font-size: 12.5px;
  color: var(--fg-2);
  margin-bottom: 3px;
}

.explain-item p.en {
  font-size: 11.5px;
  color: var(--fg-4);
}

/* ==========================================================================
   Utility
   ========================================================================== */

.hidden {
  display: none !important;
}

::-webkit-scrollbar {
  width: 9px;
  height: 9px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-3);
  border-radius: var(--radius-sm);
  border: 2px solid var(--bg-1);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--bg-elev);
}

@media (max-width: 1100px) {
  .top-row {
    flex-direction: column;
  }

  .viz-panel {
    width: 100%;
    flex: none;
  }

  #viz-canvas-wrap {
    width: 100%;
    max-width: 500px;
  }

  .history-panel {
    width: 100%;
  }

  .mid-row {
    grid-template-columns: 1fr;
  }

  .floor-cards {
    max-height: none;
  }
}

/* Last-updated (BKK time) label in the header status area */
.last-updated {
  font-family: var(--font-mono);
  color: var(--fg-3);
  font-size: 10.5px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-left: 10px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
