:root {
  --bg: #ffffff;
  --fg: #1d2330;
  --muted: #5d6677;
  --line: #d9dee7;
  --panel: #f5f7fa;
  --accent: #2b5fb4;
  --accent-fg: #ffffff;
  --series-1: #2b5fb4;
  --series-2: #c2410c;
  --error: #b42318;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --fg: #e4e8ef;
    --muted: #9aa3b2;
    --line: #2c3340;
    --panel: #1a1f27;
    --accent: #7aa2f7;
    --accent-fg: #0b0e13;
    --series-1: #7aa2f7;
    --series-2: #f0a35e;
    --error: #f97066;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 1040px;
  padding: 0 16px 32px;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

h1 { font-size: 1.6rem; margin: 24px 0 4px; }
h2 { font-size: 1.05rem; margin: 24px 0 8px; }
.subtitle, .hint, footer { color: var(--muted); }
.status { font-size: 0.9rem; color: var(--muted); }
.error { color: var(--error); white-space: pre-wrap; }
code { font-size: 0.9em; }
a { color: var(--accent); }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-top: 16px; flex-wrap: wrap; }
.tabs button {
  border: 1px solid transparent; border-bottom: none; background: none; color: var(--muted);
  padding: 8px 14px; border-radius: 6px 6px 0 0; font: inherit; cursor: pointer;
}
.tabs button[aria-selected="true"] { border-color: var(--line); background: var(--panel); color: var(--fg); }

.panel { padding: 16px 0; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; margin: 8px 0; }
label { display: inline-flex; flex-direction: column; gap: 4px; font-size: 0.9rem; color: var(--muted); }
label.block { display: flex; }
input, select, textarea, button { font: inherit; color: var(--fg); }
input, select, textarea {
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; max-width: 100%;
}
input[type="number"] { width: 5.5em; }
textarea { width: 100%; font-family: ui-monospace, monospace; font-size: 0.85rem; }
button {
  background: var(--accent); color: var(--accent-fg); border: none; border-radius: 6px; padding: 7px 14px; cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: progress; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.plot { width: 100%; height: auto; background: var(--panel); border-radius: 8px; display: block; }
.plot text { fill: var(--muted); font-size: 11px; }
.plot .axis { stroke: var(--line); }
.plot .stick { stroke: var(--series-1); stroke-width: 1.5; }
.plot .stick.y { stroke: var(--series-2); }
.plot .line { fill: none; stroke: var(--series-1); stroke-width: 1.5; }
.plot .label-b { fill: var(--series-1); }
.plot .label-y { fill: var(--series-2); }

table.kv td { padding: 2px 12px 2px 0; }
table.kv td:first-child { color: var(--muted); }
.table-wrap { max-height: 420px; overflow: auto; border: 1px solid var(--line); border-radius: 8px; margin-top: 8px; }
.table-wrap:has(table[hidden]) { display: none; }
table.data { border-collapse: collapse; width: 100%; font-size: 0.85rem; font-variant-numeric: tabular-nums; }
table.data th { position: sticky; top: 0; background: var(--panel); text-align: left; }
table.data th, table.data td { padding: 4px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.selectable tbody tr { cursor: pointer; }
table.selectable tbody tr:hover, table.selectable tbody tr.selected { background: var(--panel); }

.drop-zone {
  display: flex; align-items: center; justify-content: center; text-align: center;
  border: 2px dashed var(--line); border-radius: 10px; padding: 32px 16px; cursor: pointer; color: var(--muted);
}
.drop-zone.over { border-color: var(--accent); }
.drop-zone input { display: none; }

footer { margin-top: 32px; font-size: 0.85rem; }