:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1b1f24;
  --muted: #667085;
  --border: #dde1e6;
  --accent: #3a5bd9;
  --accent-text: #ffffff;
  --ok: #1f7a4d;
  --err: #b42318;
  --code-bg: #f1f3f6;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --panel: #181c21;
    --text: #e6e8eb;
    --muted: #9aa3ae;
    --border: #2a3038;
    --accent: #7b96ff;
    --accent-text: #0d1117;
    --ok: #4cc38a;
    --err: #ff7b72;
    --code-bg: #1f242b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header, main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

header { padding-top: 28px; }
h1 { font-size: 1.6rem; margin: 0 0 6px; }
h2 { font-size: 1rem; margin: 0; }
.lede { margin: 0 0 12px; max-width: 70ch; }
.muted { color: var(--muted); font-weight: normal; }
code, textarea, .values { font-family: ui-monospace, "SF Mono", Menlo, monospace; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: 0.9em; }

.env { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 0.85rem;
  background: var(--panel);
}
.pill.ok { color: var(--ok); }
.pill.err { color: var(--err); }

main { display: grid; gap: 16px; padding-bottom: 40px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  min-width: 0;
}

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

.controls { display: flex; gap: 12px; flex-wrap: wrap; }
label { font-size: 0.85rem; color: var(--muted); display: flex; gap: 6px; align-items: center; }

select, button, textarea {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
select { padding: 4px 6px; }

textarea {
  width: 100%;
  min-height: 260px;
  padding: 12px;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
  tab-size: 2;
}

.actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
button { padding: 6px 14px; cursor: pointer; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button:disabled { opacity: 0.6; cursor: progress; }
.status { font-size: 0.9rem; }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); white-space: pre-wrap; }

.ops { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.ops .op { font-size: 0.8rem; padding: 1px 8px; border-radius: 4px; background: var(--code-bg); }

.tensors { display: grid; gap: 14px; }
.tensor h3 { font-size: 0.9rem; margin: 0 0 6px; }
.tensor textarea { min-height: 64px; }
.tensor .body { display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
.tensor .values {
  flex: 1 1 300px;
  min-width: 0;
  margin: 0;
  padding: 10px;
  background: var(--code-bg);
  border-radius: 6px;
  font-size: 12.5px;
  max-height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

canvas.heatmap {
  image-rendering: pixelated;
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 160px;
  max-width: 100%;
}

.nav { font-size: 0.85rem; color: var(--muted); margin-bottom: 8px; }
a { color: var(--accent); }

.matrices { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.matrices h3 { font-size: 0.9rem; margin: 0 0 8px; }
.matrix { overflow-x: auto; }
.matrix table { border-collapse: collapse; font-size: 12.5px; font-variant-numeric: tabular-nums; }
.matrix td { padding: 4px 6px; border: 1px solid var(--border); text-align: right; }
.matrix thead td { color: var(--muted); text-align: center; border: none; }
.matrix td.label {
  text-align: left;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: none;
  color: var(--muted);
}
.matrix td.cell { background: color-mix(in srgb, var(--accent) calc(var(--level) * 70%), transparent); }
.parity { margin: 12px 0 0; font-size: 0.9rem; }