:root {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --panel-alt: #f8fafc;
  --border: #d8e0ea;
  --text: #0f172a;
  --muted: #5b6878;
  --accent: #1d4ed8;
  --accent-soft: #e6edfd;
  --ok: #047857;
  --ok-soft: #dcfce7;
  --fail: #b91c1c;
  --fail-soft: #fee2e2;

  --plot-panel: #ffffff;
  --plot-grid: #e6ebf2;
  --plot-axis: #93a1b3;
  --plot-text: #0f172a;
  --plot-muted: #5b6878;
  --plot-trace: #1d4ed8;
  --plot-trace2: #ea580c;
  --plot-ref: #dc2626;
  --plot-mask: rgba(29, 78, 216, 0.10);
  --plot-mask-adj: rgba(220, 38, 38, 0.10);
}

[data-theme='dark'] {
  --bg: #0b0f16;
  --panel: #141a23;
  --panel-alt: #1b222d;
  --border: #2a3441;
  --text: #e7ecf3;
  --muted: #94a3b8;
  --accent: #60a5fa;
  --accent-soft: #1e293b;
  --ok: #4ade80;
  --ok-soft: #14321f;
  --fail: #f87171;
  --fail-soft: #3b1618;

  --plot-panel: #141a23;
  --plot-grid: #26303d;
  --plot-axis: #5a6a7d;
  --plot-text: #e7ecf3;
  --plot-muted: #94a3b8;
  --plot-trace: #60a5fa;
  --plot-trace2: #fb923c;
  --plot-ref: #f87171;
  --plot-mask: rgba(96, 165, 250, 0.12);
  --plot-mask-adj: rgba(248, 113, 113, 0.12);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button, select, input, textarea { font: inherit; color: inherit; }

.app {
  display: grid;
  grid-template-columns: 336px minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  height: 100vh;
}

.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.brand { display: flex; flex-direction: column; margin-right: auto; }
.brand strong { font-size: 15px; letter-spacing: 0.2px; }
.brand span { font-size: 11.5px; color: var(--muted); }

.topbar label { font-size: 12px; color: var(--muted); }

.btn {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-alt);
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.sidebar {
  overflow-y: auto;
  padding: 14px;
  background: var(--panel);
  border-right: 1px solid var(--border);
}

.main {
  overflow-y: auto;
  padding: 14px 16px 26px;
  min-width: 0;
}

.group {
  border: 1px solid var(--border);
  border-radius: 9px;
  margin-bottom: 12px;
  background: var(--panel-alt);
  overflow: hidden;
}

.group > summary {
  padding: 9px 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  background: var(--panel);
  border-bottom: 1px solid transparent;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.group[open] > summary { border-bottom-color: var(--border); }
.group > summary::-webkit-details-marker { display: none; }
.group > summary::before { content: '▸'; color: var(--muted); font-size: 11px; }
.group[open] > summary::before { content: '▾'; }

.group-body { padding: 10px 12px 12px; }

.field { margin-bottom: 11px; }
.field:last-child { margin-bottom: 0; }

.field > label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.field input[type='number'],
.field input[type='text'],
.field select,
.field textarea {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
}
.field textarea { resize: vertical; min-height: 54px; font-family: ui-monospace, Consolas, monospace; font-size: 12px; }

.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

.field.invalid input, .field.invalid select { border-color: var(--fail); }
.field .error { display: none; color: var(--fail); font-size: 11.5px; margin-top: 3px; }
.field.invalid .error { display: block; }

.slider { display: grid; grid-template-columns: 1fr 78px; gap: 8px; align-items: center; }
.slider input[type='range'] { width: 100%; accent-color: var(--accent); }

.switch {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 9px;
}
.switch input { accent-color: var(--accent); width: 15px; height: 15px; }

.hint { font-size: 11.5px; color: var(--muted); margin-top: 6px; }

.metrics {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  margin-bottom: 14px;
  overflow: hidden;
}

.metrics-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 13px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.metrics-head h2 { font-size: 13px; margin: 0; }
.metrics-head .spacer { margin-left: auto; }

.verdict {
  font-weight: 700;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
}
.verdict.pass { background: var(--ok-soft); color: var(--ok); }
.verdict.fail { background: var(--fail-soft); color: var(--fail); }

table.results { width: 100%; border-collapse: collapse; font-size: 13px; }
table.results th, table.results td {
  padding: 7px 13px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
table.results th { font-size: 11.5px; color: var(--muted); font-weight: 600; }
table.results tr:last-child td { border-bottom: none; }
table.results td.num { font-variant-numeric: tabular-nums; font-weight: 600; }
table.results td.extra { color: var(--muted); font-size: 12px; }
table.results td.mark { font-weight: 700; white-space: nowrap; }
table.results td.mark.pass { color: var(--ok); }
table.results td.mark.fail { color: var(--fail); }

.chips { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 12px; }
.chip {
  padding: 5px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  cursor: pointer;
  font-size: 12.5px;
}
.chip[aria-pressed='true'] {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.plots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 12px;
}

.plot {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  overflow: hidden;
  position: relative;
}
.plot canvas { display: block; width: 100%; height: 300px; }
.plot[hidden] { display: none; }

.plot-actions {
  position: absolute;
  top: 7px;
  right: 7px;
  display: flex;
  gap: 5px;
  opacity: 0;
  transition: opacity 0.15s;
}
.plot:hover .plot-actions, .plot:focus-within .plot-actions { opacity: 1; }
.plot-actions button {
  padding: 3px 8px;
  font-size: 11px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--panel-alt);
  cursor: pointer;
}

.banner {
  padding: 9px 13px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 13px;
  background: var(--fail-soft);
  color: var(--fail);
  border: 1px solid currentColor;
}
.banner[hidden] { display: none; }

.status {
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; grid-template-rows: auto auto minmax(0, 1fr); height: auto; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); max-height: none; }
  .plots { grid-template-columns: 1fr; }
  .plot canvas { height: 260px; }
}

@media print {
  .sidebar, .topbar, .chips, .plot-actions { display: none !important; }
  .app { display: block; height: auto; }
  .plots { grid-template-columns: 1fr 1fr; }
  body { background: #fff; }
}