/* micrograd demo. One accent colour (violet, so it never looks like a class colour),
   system fonts only, light and dark themes. */

:root {
  --bg: #f6f6f8;
  --card: #ffffff;
  --text: #1c1c22;
  --muted: #5d5d6b;
  --border: #dcdce3;
  --accent: #5b47d6;
  --accent-text: #ffffff;
  --focus: #5b47d6;
  --error: #b3261e;
  --ok: #1e7a3c;
  --track: #ececf1;
  --python-bar: #8b8b99;
  --pos: #0072b2;   /* class +1: Okabe-Ito blue (same as data.js) */
  --neg: #e69f00;   /* class -1: Okabe-Ito orange */
  --axis: #8b8b99;
  --grid: #ececf1;
  --curve: #5b47d6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121217;
    --card: #1c1c23;
    --text: #ececf1;
    --muted: #a5a5b4;
    --border: #33333f;
    --accent: #9d8fff;
    --accent-text: #121217;
    --focus: #b5aaff;
    --error: #ff8a80;
    --ok: #7ad48f;
    --track: #2a2a34;
    --python-bar: #8b8b99;
    --axis: #8b8b99;
    --grid: #2a2a34;
    --curve: #9d8fff;
  }
}

* { box-sizing: border-box; }
/* The `hidden` attribute must win over any `display` set below (spinner, badge...). */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

.top { max-width: 1240px; margin: 0 auto; padding: 20px 16px 4px; }
h1 { font-size: 1.45rem; margin: 0 0 4px; }
h2 { font-size: 1.05rem; margin: 0 0 10px; }
.sub { margin: 0 0 8px; color: var(--muted); max-width: 70ch; }

.status-bar { position: sticky; top: 0; z-index: 2; background: var(--bg); border-bottom: 1px solid var(--border); }
.status { max-width: 1240px; margin: 0 auto; padding: 6px 16px; min-height: 1.45em; font-weight: 500; }
.status.error { color: var(--error); }

.empty { margin: 12px 0 0; padding: 10px 12px; border: 1px dashed var(--border); border-radius: 6px; color: var(--muted); font-size: 0.9rem; }

.foot { max-width: 1240px; margin: 0 auto; padding: 0 16px 24px; font-size: 0.85rem; color: var(--muted); }
.foot a { color: var(--accent); }

.layout {
  max-width: 1240px;
  margin: 0 auto;
  padding: 12px 16px 32px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

.col { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}
.card-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 6px 12px; }

/* Plots: the canvas fills its wrapper; app.js sizes the backing store for devicePixelRatio. */
.plot-wrap { width: 100%; max-width: 560px; aspect-ratio: 1 / 1; margin: 0 auto; }
.loss-wrap { width: 100%; height: 240px; }
canvas { display: block; width: 100%; height: 100%; border-radius: 6px; }
#plot { cursor: crosshair; touch-action: manipulation; border: 1px solid var(--border); }

.legend { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 0.85rem; color: var(--muted); align-items: center; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; vertical-align: -1px;
       border: 1.5px solid #fff; box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.35); }
.dot-pos { background: var(--pos); }
.dot-neg { background: var(--neg); }
.ramp-wrap { display: inline-flex; align-items: center; gap: 6px; }
.ramp { display: inline-block; width: 64px; height: 10px; border-radius: 3px; border: 1px solid var(--border);
        /* the same 55%-tint scale as data.js predColor */
        background: linear-gradient(to right, rgb(241, 202, 115), #fff, rgb(115, 177, 213)); }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; }
.readout { margin: 8px 0 0; color: var(--muted); font-variant-numeric: tabular-nums; }
.hint { margin: 8px 0 0; color: var(--muted); font-size: 0.86rem; }
.muted { color: var(--muted); }
.small { font-size: 0.83rem; }
.note { margin: 12px 0 0; font-size: 0.86rem; color: var(--muted); border-top: 1px solid var(--border); padding-top: 8px; }
code { font-size: 0.9em; }

/* Form controls */
.grid-form { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 8px 12px; align-items: center; }
.grid-form label { font-size: 0.92rem; }
.inline { display: flex; gap: 8px; min-width: 0; }
.inline input { flex: 1; min-width: 0; }

input[type="number"], input[type="text"], select, textarea {
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  width: 100%;
  min-width: 0;
}
textarea { font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace; font-size: 0.85rem; margin-top: 6px; resize: vertical; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
#scrub { flex: 1; min-width: 120px; width: auto; }
.scrub-label { font-size: 0.85rem; color: var(--muted); }
input[type="radio"], input[type="checkbox"] { accent-color: var(--accent); }

button, .file-btn {
  font: inherit;
  font-size: 0.92rem;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}
button:hover:not(:disabled), .file-btn:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

/* Visible keyboard focus everywhere. */
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
#csv-file { position: absolute; width: 1px; height: 1px; opacity: 0; }
#csv-file:focus-visible + .file-btn { outline: 2px solid var(--focus); outline-offset: 2px; }

.classes { border: none; padding: 0; margin: 12px 0 0; display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; }
.classes legend { float: left; padding: 0; margin-right: 8px; font-size: 0.92rem; }
.check { font-size: 0.88rem; color: var(--muted); }

.csv { margin-top: 12px; }
.csv summary { cursor: pointer; font-size: 0.92rem; }
.csv label[for="csv-text"] { display: block; margin-top: 8px; font-size: 0.86rem; color: var(--muted); }

/* Benchmark */
.bench-result { margin-top: 14px; }
.bar-row { display: grid; grid-template-columns: 4.2em minmax(0, 1fr) 6.5em; gap: 8px; align-items: center; margin: 6px 0; }
.bar-name { font-weight: 600; font-size: 0.92rem; }
.bar-track { background: var(--track); border-radius: 4px; height: 18px; overflow: hidden; }
.bar { height: 100%; width: 0; border-radius: 4px; transition: width 0.6s ease-out; }
.bar-cpp { background: var(--accent); }
.bar-py { background: var(--python-bar); }
.bar.timeout { background: repeating-linear-gradient(45deg, var(--python-bar) 0 6px, transparent 6px 12px); }
.bar-time { font-variant-numeric: tabular-nums; font-size: 0.9rem; text-align: right; }
.bench-summary { margin: 10px 0 4px; font-size: 1.05rem; }
.bench-result p { margin: 4px 0; }
.badge { display: inline-block; font-size: 0.8rem; font-weight: 600; padding: 1px 8px; border-radius: 999px; border: 1px solid currentColor; }
.badge.ok { color: var(--ok); }
.badge.bad { color: var(--error); }
#estimate.warn { color: var(--error); }

.spinner { display: inline-block; width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--track); border-top-color: var(--accent);
           animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.4s; }
  .bar { transition: none; }
}