:root {
  --mist: #e6ecee;
  --panel: #f4f7f8;
  --deep: #10262e;
  --water: #1d6e8a;
  --past: #8fa7b0;
  --caution: #d99a1e;
  --critical: #b3261e;
  --line: #c9d5d9;
  --muted: #4f656d;

  --f-display: 'Chakra Petch', 'IBM Plex Sans Thai', sans-serif;
  --f-body: 'IBM Plex Sans Thai', system-ui, sans-serif;
  --f-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --gauge-max: 110;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  background: var(--mist);
  color: var(--deep);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.55;
}

body {
  margin: 0 auto;
  max-width: 1280px;
  padding: 28px clamp(16px, 4vw, 48px) 40px;
}

h1,
h2,
h3 {
  font-family: var(--f-display);
  font-weight: 600;
  margin: 0;
  line-height: 1.15;
}

a {
  color: var(--water);
}

:focus-visible {
  outline: 3px solid var(--caution);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- Masthead ---------- */

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--deep);
}

.eyebrow {
  margin: 0 0 4px;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.masthead h1 {
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.stamp {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}

/* ---------- Now: gauge + cards ---------- */

.now {
  display: grid;
  grid-template-columns: 168px 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding: 28px 0 36px;
}

.gauge {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.gauge-board {
  position: relative;
  width: 92px;
  height: 440px;
  background: #fff;
  border: 2px solid var(--deep);
  overflow: visible;
}

/* The alternating 2% bands on the left half form the "E" pattern of a real staff gauge. */
.gauge-board::before {
  content: '';
  position: absolute;
  inset: 0 50% 0 0;
  background: repeating-linear-gradient(
    to top,
    var(--deep) 0 calc(100% / 55),
    transparent calc(100% / 55) calc(200% / 55)
  );
}

.gauge-ticks {
  position: absolute;
  inset: 0;
}

.gauge-tick {
  position: absolute;
  left: 50%;
  right: 0;
  bottom: calc(var(--at) / var(--gauge-max) * 100%);
  border-bottom: 2px solid var(--critical);
}

.gauge-tick span {
  position: absolute;
  right: 6px;
  bottom: 1px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--critical);
  line-height: 1;
}

.gauge-water {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: calc(min(var(--pct), var(--gauge-max)) / var(--gauge-max) * 100%);
  background: rgb(29 110 138 / 0.58);
  border-top: 3px solid var(--water);
  transition: height 900ms cubic-bezier(0.2, 0.7, 0.2, 1), background-color 300ms;
}

.gauge[data-level='over'] .gauge-water {
  background: rgb(179 38 30 / 0.5);
  border-top-color: var(--critical);
}

.gauge-limit {
  position: absolute;
  left: -14px;
  right: -14px;
  bottom: calc(min(var(--limit), var(--gauge-max)) / var(--gauge-max) * 100%);
  border-top: 2px dashed var(--deep);
  transition: bottom 250ms ease-out;
}

.gauge-limit span {
  position: absolute;
  right: -10px;
  transform: translate(100%, -50%);
  padding: 1px 6px;
  background: var(--deep);
  color: #fff;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  white-space: nowrap;
}

.gauge figcaption {
  text-align: center;
}

.gauge-value {
  display: block;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.gauge-label {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--muted);
}

.now-body {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

/* ---------- Alert ---------- */

.alert {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  padding: 14px 18px;
  border-left: 6px solid var(--water);
  background: var(--panel);
}

.alert strong {
  font-family: var(--f-display);
  font-size: 1.25rem;
}

.alert[data-level='idle'] {
  border-left-color: var(--line);
}

.alert[data-level='near'] {
  border-left-color: var(--caution);
  background: #fbf1dc;
}

.alert[data-level='over'],
.alert[data-level='error'] {
  border-left-color: var(--critical);
  background: #f8e2e0;
}

.alert[data-level='over'] strong,
.alert[data-level='error'] strong {
  color: var(--critical);
}

.alerts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.alerts .alert {
  flex-direction: column;
  align-items: flex-start;
  flex-wrap: nowrap;
  gap: 2px;
  padding: 12px 16px 14px;
}

.alert-label {
  font-weight: 600;
  color: var(--deep);
}

.alert-label small {
  font-weight: 400;
  color: var(--muted);
}

.alerts .alert strong {
  font-size: 1.7rem;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

.alerts .alert strong small {
  margin-left: 4px;
  font-family: var(--f-body);
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--muted);
}

.alert-detail {
  font-size: 0.85rem;
}

.alert[data-level='over'] .alert-detail {
  color: var(--critical);
  font-weight: 600;
}

.alert button {
  font: inherit;
  padding: 2px 12px;
  border: 1px solid var(--deep);
  background: #fff;
  cursor: pointer;
}

/* ---------- Limits ---------- */

.limits {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.limit-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px 14px;
  background: #fff;
  border-top: 4px solid var(--deep);
  font-size: 0.85rem;
  color: var(--muted);
}

.limit-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--deep);
}

.limit-hint {
  margin-bottom: 4px;
}

.field {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--deep);
  background: #fff;
}

.field input {
  flex: 1;
  min-width: 0;
  width: 7.5ch;
  padding: 6px 8px;
  border: 0;
  background: transparent;
  font-family: var(--f-mono);
  font-size: 1.05rem;
  color: var(--deep);
}

.field input:focus-visible {
  outline: none;
}

.field:focus-within {
  outline: 3px solid var(--caution);
  outline-offset: 2px;
}

.unit {
  white-space: nowrap;
  padding: 0 10px;
  font-size: 0.8rem;
  color: var(--muted);
  border-left: 1px solid var(--line);
  align-self: stretch;
  display: flex;
  align-items: center;
}

/* ---------- Dam cards ---------- */

.dams {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.dam {
  --band: var(--water);
  --band-ink: var(--deep);
  --band-tint: #fff;
  padding: 14px 16px 16px;
  background: var(--band-tint);
  border-top: 6px solid var(--band);
  transition: background-color 300ms, border-color 300ms;
}

.dam[data-band='low'] {
  --band: #2e8b3e;
  --band-ink: #1f6b2c;
  --band-tint: #eef7ef;
}

.dam[data-band='mid'] {
  --band: #e3b400;
  --band-ink: #8a6a00;
  --band-tint: #fdf7e1;
}

.dam[data-band='high'] {
  --band: var(--critical);
  --band-ink: var(--critical);
  --band-tint: #fbecea;
}

.dam h3 {
  font-size: 1.15rem;
}

.dam-pct {
  margin: 6px 0 8px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--band-ink);
}

.dam-pct small {
  font-size: 1rem;
  font-weight: 500;
}

.dam-bar {
  height: 8px;
  background: var(--mist);
  margin-bottom: 12px;
}

.dam-bar div {
  height: 100%;
  width: calc(min(var(--pct), 100) * 1%);
  background: var(--band);
  transition: width 900ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.dam dl,
.total {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  font-size: 0.85rem;
}

.dam dt,
.total dt {
  color: var(--muted);
}

.dam dd,
.total dd {
  margin: 0;
  text-align: right;
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
}

.total {
  grid-template-columns: repeat(5, auto);
  grid-auto-flow: column;
  grid-template-rows: auto auto;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--deep);
  color: #fff;
}

.total dt {
  color: var(--past);
}

.total dd {
  text-align: left;
  font-size: 1.15rem;
}

/* ---------- Barrages (different unit: m³/s) ---------- */

.barrage {
  padding: 12px 18px 14px;
  background: #fff;
  border-left: 6px solid var(--water);
}

.barrage h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.barrage h3 small {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--muted);
  margin-left: 6px;
}

.barrage dl {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, auto);
  grid-template-rows: auto auto;
  grid-auto-flow: column;
  justify-content: space-between;
  gap: 2px 18px;
  font-size: 0.85rem;
}

.barrage dt {
  color: var(--muted);
}

.barrage dd {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 1.15rem;
  font-variant-numeric: tabular-nums;
}

.barrage dd small {
  font-family: var(--f-body);
  font-size: 0.75rem;
  color: var(--muted);
}

.barrage dd.barrage-error {
  font-family: var(--f-body);
  font-size: 0.9rem;
  color: var(--critical);
}

/* ---------- Compare ---------- */

.compare {
  border-top: 2px solid var(--deep);
  padding-top: 24px;
}

.compare-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 20px;
}

.compare-head h2 {
  font-size: 1.8rem;
}

.hint {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 36px;
  margin: 18px 0;
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

legend {
  padding: 0;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

.chip {
  position: relative;
}

.chip input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.chip span {
  display: inline-block;
  padding: 5px 14px;
  border: 1.5px solid var(--deep);
  background: #fff;
  font-size: 0.95rem;
  white-space: nowrap;
}

.chip input:checked + span {
  background: var(--deep);
  color: #fff;
}

.chip input:focus-visible + span {
  outline: 3px solid var(--caution);
  outline-offset: 2px;
}

.chip input:disabled + span {
  opacity: 0.4;
}

.chip input:disabled {
  cursor: not-allowed;
}

.chip[data-swatch] span::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 3px;
  margin-right: 8px;
  vertical-align: middle;
  background: var(--swatch);
}

.progress {
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.progress p {
  margin: 0 0 6px;
  font-family: var(--f-mono);
}

.progress-bar {
  height: 6px;
  background: #fff;
}

.progress-bar div {
  height: 100%;
  width: 0;
  background: var(--water);
  transition: width 400ms;
}

.error {
  padding: 12px 16px;
  background: #f8e2e0;
  border-left: 6px solid var(--critical);
  margin: 0 0 16px;
}

.charts {
  display: grid;
  gap: 16px;
}

.chart-card {
  background: #fff;
  padding: 16px 18px 12px;
}

.chart-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.chart-card small {
  font-family: var(--f-body);
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--muted);
  margin-left: 6px;
}

.chart-box {
  position: relative;
  height: 340px;
}

.chart-card-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px 16px;
  margin-bottom: 10px;
}

.chart-card-head h3 {
  margin-bottom: 0;
}

.flow-picker .chip span {
  padding: 3px 12px;
  font-size: 0.9rem;
}

.foot {
  margin-top: 32px;
  font-size: 0.8rem;
  color: var(--muted);
}

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

@media (max-width: 1040px) {
  .dams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .now {
    grid-template-columns: 1fr;
  }

  .limits,
  .alerts {
    grid-template-columns: 1fr;
  }

  .gauge {
    flex-direction: row;
    align-items: center;
  }

  .gauge-board {
    flex: 1;
    width: auto;
    height: 64px;
  }

  .gauge-board::before {
    inset: 50% 0 0 0;
    background: repeating-linear-gradient(
      to right,
      var(--deep) 0 calc(100% / 55),
      transparent calc(100% / 55) calc(200% / 55)
    );
  }

  .gauge-tick {
    top: 0;
    bottom: 50%;
    left: calc(var(--at) / var(--gauge-max) * 100%);
    right: auto;
    border-bottom: 0;
    border-left: 2px solid var(--critical);
  }

  .gauge-tick span {
    left: 3px;
    right: auto;
    top: 3px;
    bottom: auto;
    font-size: 0.75rem;
  }

  .gauge-tick:first-child span {
    display: none;
  }

  .gauge-water {
    top: 0;
    width: calc(min(var(--pct), var(--gauge-max)) / var(--gauge-max) * 100%);
    height: auto;
    border-top: 0;
    border-right: 3px solid var(--water);
    transition-property: width, background-color;
  }

  .gauge-limit {
    top: -10px;
    bottom: -10px;
    left: calc(min(var(--limit), var(--gauge-max)) / var(--gauge-max) * 100%);
    right: auto;
    border-top: 0;
    border-left: 2px dashed var(--deep);
    transition-property: left;
  }

  .gauge-limit span {
    top: auto;
    bottom: -4px;
    right: auto;
    left: 0;
    transform: translate(-50%, 100%);
  }

  .gauge figcaption {
    min-width: 96px;
  }

  .gauge-value {
    font-size: 2rem;
  }

  .dams {
    grid-template-columns: 1fr;
  }

  .total {
    grid-auto-flow: row;
    grid-template-columns: auto 1fr;
    grid-template-rows: none;
  }

  .total dd {
    text-align: right;
  }

  .barrage dl {
    grid-auto-flow: row;
    grid-template-columns: auto 1fr;
    grid-template-rows: none;
  }

  .barrage dd {
    text-align: right;
  }

  .chart-box {
    height: 280px;
  }

  .stamp {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}