/* Design tokens — validated palette (dataviz reference instance).
   Series slots 1–3 pass all-pairs CVD + normal-vision gates in both modes. */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --danger: #d03b3b;
  /* Series colors (user-requested semantics: hold=green, outflow=red).
     Validated for CVD both modes; light green↔red sits in the 6–8 band,
     covered by the chart's secondary encoding (band gaps + legend + table). */
  --s1: #2a78d6; /* LP      (blue)  */
  --s2: #008300; /* Hold    (green) */
  --s3: #e34948; /* Outflow (red)   */
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --danger: #e66767;
    --s1: #3987e5;
    --s2: #008300;
    --s3: #e66767;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
.wrap { max-width: 1060px; margin: 0 auto; padding: 24px 20px 80px; }

header h1 { font-size: 21px; margin: 0 0 4px; }
header p { color: var(--ink-2); margin: 0 0 20px; max-width: 70ch; }
header a { color: var(--accent); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin-bottom: 18px;
}
.card h2 { font-size: 15px; margin: 0 0 12px; }

/* ---- form ---- */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 16px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field.span2 { grid-column: span 2; }
@media (max-width: 640px) { .field.span2 { grid-column: span 1; } }
label { font-size: 12px; font-weight: 600; color: var(--ink-2); }
label .hint { font-weight: 400; color: var(--muted); }
input[type="text"], input[type="number"], select, textarea {
  background: var(--page);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 9px;
  font: inherit;
  font-variant-numeric: tabular-nums;
  width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
input[aria-invalid="true"] { outline: 2px solid var(--danger); outline-offset: -1px; }
.inline { display: flex; gap: 8px; align-items: center; }
.inline input { flex: 1; }
.radio-row { display: flex; gap: 18px; align-items: center; padding-top: 4px; }
.radio-row label { font-weight: 400; color: var(--ink); display: flex; gap: 6px; align-items: center; }
.note { font-size: 12px; color: var(--muted); margin-top: 6px; }
.note.ok { color: var(--ink-2); }
.note.err { color: var(--danger); }

details.advanced { margin-top: 14px; }
details.advanced summary { cursor: pointer; font-size: 13px; color: var(--ink-2); user-select: none; }
details.advanced .grid { margin-top: 12px; }
.check-row { display: flex; gap: 8px; align-items: center; padding-top: 20px; }
.check-row label { font-weight: 400; color: var(--ink); }

/* ---- buttons ---- */
button {
  font: inherit;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  padding: 8px 14px;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; padding: 9px 22px; }
button.primary:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.5; cursor: default; }
button.small { padding: 5px 10px; font-size: 12.5px; white-space: nowrap; }
.actions { display: flex; gap: 10px; align-items: center; margin-top: 16px; }

/* ---- progress ---- */
.progress { display: none; margin-top: 14px; }
.progress.active { display: block; }
.bar-track { height: 6px; border-radius: 3px; background: var(--grid); overflow: hidden; }
.bar-fill { height: 100%; width: 0%; border-radius: 3px; background: var(--accent); transition: width 0.25s; }
.progress .status { font-size: 12.5px; color: var(--ink-2); margin-top: 6px; font-variant-numeric: tabular-nums; }

/* ---- chart ---- */
.legend { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 8px; font-size: 13px; color: var(--ink-2); }
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.key { display: inline-block; width: 10px; height: 10px; border-radius: 3px; }
.key.s1 { background: var(--s1); }
.key.s2 { background: var(--s2); }
.key.s3 { background: var(--s3); }

#chart svg { display: block; }
#chart .grid { stroke: var(--grid); stroke-width: 1; }
#chart .baseline { stroke: var(--baseline); stroke-width: 1; }
#chart .tick { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
#chart .band.s1 { fill: var(--s1); opacity: 0.42; }
#chart .band.s2 { fill: var(--s2); opacity: 0.42; }
#chart .band.s3 { fill: var(--s3); opacity: 0.42; }
#chart .band-gap { fill: none; stroke: var(--surface); stroke-width: 4; }
#chart .band-edge { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
#chart .band-edge.s1 { stroke: var(--s1); }
#chart .band-edge.s2 { stroke: var(--s2); }
#chart .band-edge.s3 { stroke: var(--s3); }
#chart .crosshair { stroke: var(--baseline); stroke-width: 1; }
#chart .dot { stroke: var(--surface); stroke-width: 2; }
#chart .dot.s1 { fill: var(--s1); }
#chart .dot.s2 { fill: var(--s2); }
#chart .dot.s3 { fill: var(--s3); }

.chart-tip {
  position: absolute;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  padding: 8px 12px;
  font-size: 12.5px;
  min-width: 170px;
  z-index: 5;
  font-variant-numeric: tabular-nums;
}
.chart-tip .tip-head { color: var(--muted); font-size: 11.5px; margin-bottom: 4px; }
.chart-tip div { display: flex; align-items: center; gap: 6px; }
.chart-tip b { margin-left: auto; font-weight: 600; }
.chart-tip .tip-total { border-top: 1px solid var(--grid); margin-top: 4px; padding-top: 4px; color: var(--ink-2); }

/* ---- tables ---- */
.table-scroll { overflow-x: auto; max-height: 420px; overflow-y: auto; border: 1px solid var(--border); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 12.5px; font-variant-numeric: tabular-nums; }
th, td { text-align: right; padding: 6px 10px; border-bottom: 1px solid var(--grid); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; font-family: ui-monospace, Consolas, monospace; }
thead th { position: sticky; top: 0; background: var(--surface); color: var(--ink-2); font-weight: 600; z-index: 1; }
tbody tr:hover { background: color-mix(in srgb, var(--accent) 7%, transparent); }

.results-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.results-head h2 { margin: 0; flex: 1; }
.pool-summary { font-size: 12.5px; color: var(--ink-2); margin-bottom: 10px; }
footer { color: var(--muted); font-size: 12px; margin-top: 24px; }
footer a { color: var(--accent); }
.hidden { display: none; }