:root {
  color-scheme: light;
  --bg: #f4f7f6;
  --panel: #ffffff;
  --ink: #17201d;
  --muted: #66736f;
  --line: #d9e2df;
  --power: #2563eb;
  --head: #dc2626;
  --oil: #d97706;
  --cooler: #059669;
  --motor: #7c3aed;
  --warn: #b45309;
  --good: #047857;
  --shadow: 0 18px 45px rgba(25, 41, 35, 0.09);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft JhengHei", "Noto Sans TC", system-ui, sans-serif;
}

button,
input {
  font: inherit;
}

.shell {
  width: min(1440px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 34px;
  line-height: 1.15;
}

h2 {
  font-size: 18px;
}

.timebox {
  min-width: 210px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.timebox span,
.timebox small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.timebox strong {
  display: block;
  margin: 4px 0;
  font-size: 20px;
}

.machine-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 14px;
}

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

.machine-card.active {
  border-color: rgba(37, 99, 235, 0.36);
}

.machine-card > div:first-child {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
}

.running {
  background: var(--good);
  box-shadow: 0 0 0 5px rgba(4, 120, 87, 0.12);
}

.stopped {
  background: #94a3b8;
  box-shadow: 0 0 0 5px rgba(100, 116, 139, 0.14);
}

dl {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0 10px;
}

dt {
  color: var(--muted);
  font-size: 12px;
}

dd {
  margin: 4px 0 0;
  font-size: 25px;
  font-weight: 800;
}

dd span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.machine-card p {
  color: var(--muted);
  font-size: 13px;
}

.workspace {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 14px;
}

.control-panel,
.chart-area,
.insights article {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.control-panel {
  padding: 16px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  background: #eef4f2;
}

.segment {
  min-width: 64px;
  border: 0;
  padding: 8px 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.segment.active {
  background: var(--ink);
  color: white;
}

fieldset {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 14px 0 18px;
  border: 0;
  border-top: 1px solid var(--line);
}

legend {
  padding: 0 0 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

label {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #2f3b37;
  font-size: 14px;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--ink);
}

.threshold-box {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.threshold-box > label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.threshold-box div {
  display: flex;
  align-items: center;
  gap: 10px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--warn);
}

output {
  min-width: 46px;
  font-weight: 800;
}

.legend-list {
  display: grid;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.legend-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.legend-item i {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 8px;
  border-radius: 999px;
}

.chart-area {
  min-width: 0;
  padding: 16px;
}

.chart-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.chart-toolbar p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.chart-toolbar .sync-status {
  color: #2563eb;
  font-size: 13px;
  font-weight: 700;
}

.badge {
  flex: 0 0 auto;
  padding: 8px 11px;
  background: #ecfdf5;
  color: var(--good);
  border: 1px solid #bbf7d0;
  font-weight: 800;
  font-size: 13px;
}

.canvas-wrap {
  position: relative;
  min-height: 420px;
}

canvas {
  display: block;
  width: 100%;
  height: min(54vw, 560px);
  min-height: 420px;
}

.tooltip {
  position: absolute;
  min-width: 190px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
  pointer-events: none;
  font-size: 12px;
}

.tooltip strong {
  display: block;
  margin-bottom: 6px;
}

.tooltip div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.insights {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 14px;
  margin-top: 14px;
}

.insights article {
  padding: 16px;
}

.correlation-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.corr-card {
  min-height: 108px;
  padding: 12px;
  border: 1px solid var(--line);
  background: #fbfdfc;
}

.corr-card span {
  color: var(--muted);
  font-size: 12px;
}

.corr-card strong {
  display: block;
  margin: 8px 0 6px;
  font-size: 26px;
}

.corr-card p {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

ul {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

li {
  padding-left: 14px;
  border-left: 4px solid var(--line);
  color: #2f3b37;
  line-height: 1.55;
}

li.warning {
  border-color: var(--warn);
}

li.good {
  border-color: var(--good);
}

@media (max-width: 960px) {
  .topbar,
  .chart-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .machine-strip,
  .workspace,
  .insights {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 560px) {
  .shell {
    width: min(100% - 20px, 1440px);
    padding-top: 12px;
  }

  h1 {
    font-size: 28px;
  }

  dl,
  .correlation-grid {
    grid-template-columns: 1fr;
  }

  canvas {
    min-height: 360px;
  }
}