:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --ink: #17211d;
  --muted: #64706a;
  --line: #d5d0c4;
  --panel: #fffdf8;
  --panel-2: #e9f0ee;
  --green: #256f5a;
  --blue: #2f6f9f;
  --amber: #b7791f;
  --red: #a6423a;
  --shadow: 0 18px 45px rgba(26, 34, 30, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: end;
  padding: 30px clamp(18px, 4vw, 46px) 22px;
  border-bottom: 1px solid var(--line);
}

h1,
h2 {
  margin: 0;
  font-weight: 650;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(30px, 4vw, 52px);
  max-width: 900px;
}

h2 {
  font-size: 20px;
}

.lead {
  max-width: 860px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--green);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-box {
  min-width: 220px;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.source-box span,
.source-box small,
.muted {
  color: var(--muted);
}

.source-box strong,
.source-box small {
  display: block;
}

main {
  padding: 22px clamp(18px, 4vw, 46px) 42px;
}

.controls-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(190px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
  padding: 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}

label span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

select {
  width: 100%;
  min-height: 40px;
  padding: 8px 10px;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.kpi {
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.kpi span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.kpi strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
}

.kpi small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.chart-section {
  margin-bottom: 18px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.section-heading {
  display: flex;
  gap: 16px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 14px;
}

.section-heading p {
  max-width: 600px;
  margin: 0;
}

.chart-wrap {
  width: 100%;
  min-height: 360px;
}

.chart-wrap.compact {
  min-height: 300px;
}

svg {
  display: block;
  width: 100%;
  height: 360px;
}

.compact svg {
  height: 300px;
}

.axis text,
.chart-label {
  fill: var(--muted);
  font-size: 12px;
}

.grid-line {
  stroke: var(--line);
  stroke-width: 1;
}

.line-main {
  fill: none;
  stroke: var(--green);
  stroke-width: 2.4;
}

.line-secondary {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2;
}

.area-renewable {
  fill: rgba(37, 111, 90, 0.14);
}

.zero-line {
  stroke: var(--muted);
  stroke-width: 1;
}

.bar-positive {
  fill: var(--green);
}

.bar-negative {
  fill: var(--red);
}

.interval-marker {
  stroke: var(--amber);
  stroke-width: 2;
}

.playback-section {
  border-color: color-mix(in srgb, var(--amber) 42%, var(--line));
}

.playback-layout {
  display: grid;
  gap: 16px;
}

.playback-controls {
  display: grid;
  grid-template-columns: auto minmax(220px, 1fr) auto;
  gap: 14px;
  align-items: end;
}

button {
  min-height: 40px;
  padding: 8px 13px;
  color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

button:hover {
  border-color: var(--green);
}

#playButton {
  min-width: 118px;
  color: #fffdf8;
  background: var(--green);
  border-color: var(--green);
}

.range-label input {
  width: 100%;
  accent-color: var(--green);
}

.speed-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.speed-button.active {
  color: #fffdf8;
  background: var(--ink);
  border-color: var(--ink);
}

.system-snapshot {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 10px;
}

.system-snapshot article {
  padding: 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.system-snapshot span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.system-snapshot strong {
  display: block;
  margin-top: 6px;
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}

.flow-board {
  display: grid;
  gap: 10px;
}

.flow-row {
  display: grid;
  grid-template-columns: 140px 1fr 110px;
  gap: 12px;
  align-items: center;
}

.flow-row span {
  color: var(--muted);
  font-size: 13px;
}

.flow-row strong {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.flow-track {
  height: 18px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.flow-fill {
  height: 100%;
  background: var(--green);
}

.flow-row.generation .flow-fill {
  background: var(--blue);
}

.flow-row.renewable .flow-fill {
  background: var(--green);
}

.flow-row.fossil .flow-fill {
  background: var(--amber);
}

.flow-row.link .flow-fill {
  background: var(--red);
}

.grid-two {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 18px;
}

.mix-list {
  display: grid;
  gap: 10px;
}

.mix-row {
  display: grid;
  grid-template-columns: minmax(130px, 190px) 1fr minmax(92px, auto);
  gap: 10px;
  align-items: center;
}

.mix-row span {
  color: var(--muted);
  font-size: 13px;
}

.mix-track {
  height: 12px;
  background: var(--panel-2);
  border-radius: 999px;
  overflow: hidden;
}

.mix-fill {
  height: 100%;
  background: var(--green);
}

.mix-value {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.table-wrap {
  overflow-x: auto;
}

.link-table-wrap {
  margin-top: 18px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 11px 10px;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}

th:first-child,
td:first-child {
  text-align: left;
}

th {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

@media (max-width: 880px) {
  .topbar,
  .grid-two,
  .controls-band,
  .playback-controls {
    grid-template-columns: 1fr;
  }

  .kpi-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .system-snapshot {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .speed-group {
    justify-content: flex-start;
  }

  .section-heading {
    display: block;
  }

  .section-heading .muted {
    margin-top: 8px;
  }
}

@media (max-width: 560px) {
  .kpi-grid {
    grid-template-columns: 1fr;
  }

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

  .system-snapshot,
  .flow-row {
    grid-template-columns: 1fr;
  }

  .flow-row strong {
    text-align: left;
  }

  .mix-value {
    text-align: left;
  }
}