:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --panel-soft: #f8fafb;
  --line: #d9e0e7;
  --text: #17212b;
  --muted: #66727f;
  --accent: #1f6f8b;
  --accent-2: #7a5c24;
  --good: #0e7665;
  --warn: #a96716;
  --bad: #b8322a;
  --inas: #3f6f9f;
  --gasb: #c47b38;
  --insb: #8a6aa8;
  --metal: #687787;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

button, input { font: inherit; }

.detector-shell {
  width: min(1920px, 100%);
  margin: 0 auto;
  padding: 12px 18px 22px;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 16px;
  margin-bottom: 10px;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.18;
  letter-spacing: 0;
}

.topbar p {
  max-width: 920px;
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

button {
  min-height: 32px;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
}

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

.workspace {
  display: grid;
  grid-template-columns: minmax(300px, 350px) minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.control-rail, .main-stage {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.result-rail {
  grid-column: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, .8fr) minmax(250px, .75fr);
  gap: 10px;
  align-items: start;
}

.panel, .hero-panel, .viz-panel, .diagnosis, .chain, .model-note, .metric {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(23, 33, 43, 0.04);
}

.panel, .diagnosis, .chain, .model-note { padding: 12px; }

.panel-title {
  margin-bottom: 9px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.control {
  display: grid;
  grid-template-columns: 82px minmax(80px, 1fr) 74px;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}

.control:last-child { border-bottom: 0; }

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

.control b {
  color: var(--text);
  text-align: right;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

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

.toggle {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 9px;
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.toggle input { position: absolute; opacity: 0; }

.toggle span {
  position: relative;
  width: 38px;
  height: 20px;
  border-radius: 999px;
  background: #c8d1da;
  flex: 0 0 auto;
}

.toggle span::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,.22);
  transition: transform .16s ease;
}

.toggle input:checked + span { background: var(--accent); }
.toggle input:checked + span::after { transform: translateX(18px); }

.hero-panel { padding: 12px; }

.hero-readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
  margin-bottom: 10px;
}

.hero-readout div {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
}

.hero-readout span, .metric span {
  display: block;
  color: var(--muted);
  font-size: 11px;
}

.hero-readout strong {
  display: block;
  margin-top: 2px;
  color: var(--accent);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}

canvas {
  display: block;
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

#deviceCanvas { height: clamp(760px, 82vh, 960px); }
#bandCanvas, #signalCanvas { height: 270px; }
#trendCanvas { height: 220px; }

.analysis-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.viz-panel { padding: 12px; }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  grid-column: 1 / -1;
}

.metric {
  padding: 9px 10px;
  min-height: 66px;
}

.metric b {
  display: block;
  margin-top: 3px;
  color: var(--text);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.diag-item {
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
}

.diag-item:last-child { border-bottom: 0; padding-bottom: 0; }

.diag-item p, .model-note p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.badge.good { background: rgba(14,118,101,.12); color: var(--good); }
.badge.warn { background: rgba(169,103,22,.14); color: var(--warn); }
.badge.bad { background: rgba(184,50,42,.12); color: var(--bad); }

.chain-step {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 8px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
  color: var(--muted);
  font-size: 12px;
}

.chain-step:last-child { border-bottom: 0; }

.chain-step b {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #e8edf2;
  color: var(--muted);
  font-size: 11px;
}

.chain-step.on {
  color: var(--text);
  font-weight: 700;
}

.chain-step.on b {
  background: var(--accent);
  color: #fff;
}

.model-note b {
  color: var(--accent);
  font-size: 12px;
}

.model-note { grid-column: 1 / -1; }

@media (max-width: 1280px) {
  .workspace {
    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  }
  .result-rail {
    grid-column: 2;
    grid-template-columns: 1fr;
  }
  .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .detector-shell { padding: 10px; }
  .topbar, .workspace, .analysis-grid { grid-template-columns: 1fr; }
  .result-rail { grid-column: 1; }
  .top-actions { justify-content: flex-start; }
  .hero-readout, .metric-grid { grid-template-columns: 1fr 1fr; }
  .control { grid-template-columns: 84px 1fr 76px; }
}

@media (max-width: 520px) {
  .hero-readout, .metric-grid { grid-template-columns: 1fr; }
}