/* ------------------------------------------------------------------ *
 *  line-charts — shared theme tokens + chart chrome
 *  Palette is the validated dataviz reference palette (light + dark),
 *  slots 1–5. Every demo library is fed these same values so the
 *  comparison is about the library, not the colours.
 * ------------------------------------------------------------------ */

:root {
  color-scheme: light;

  --page:            #f9f9f7;
  --surface:         #fcfcfb;
  --text-primary:    #0b0b0b;
  --text-secondary:  #52514e;
  --text-muted:      #898781;
  --gridline:        #e1e0d9;
  --baseline:        #c3c2b7;
  --border:          rgba(11, 11, 11, 0.10);

  /* categorical slots 1–5 (validated: light surface) */
  --series-1: #2a78d6; /* blue   */
  --series-2: #eb6834; /* orange */
  --series-3: #1baf7a; /* aqua   */
  --series-4: #eda100; /* yellow */
  --series-5: #e87ba4; /* magenta */

  --accent:   #2a78d6;
  --good:     #0ca30c;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;

    --page:            #0d0d0d;
    --surface:         #1a1a19;
    --text-primary:    #ffffff;
    --text-secondary:  #c3c2b7;
    --text-muted:      #898781;
    --gridline:        #2c2c2a;
    --baseline:        #383835;
    --border:          rgba(255, 255, 255, 0.10);

    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-4: #c98500;
    --series-5: #d55181;

    --accent:   #3987e5;
    --good:     #0ca30c;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --page:            #0d0d0d;
  --surface:         #1a1a19;
  --text-primary:    #ffffff;
  --text-secondary:  #c3c2b7;
  --text-muted:      #898781;
  --gridline:        #2c2c2a;
  --baseline:        #383835;
  --border:          rgba(255, 255, 255, 0.10);

  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --series-4: #c98500;
  --series-5: #d55181;

  --accent:   #3987e5;
  --good:     #0ca30c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

/* ---- chart card -------------------------------------------------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.card__head { padding: 16px 18px 4px; }
.card__title { margin: 0; font-size: 15px; font-weight: 650; letter-spacing: -0.01em; }
.card__desc  { margin: 2px 0 0; font-size: 12.5px; color: var(--text-secondary); }

.chart-host {
  padding: 10px 14px 16px;
  min-height: 300px;
}
.chart-host svg { max-width: 100%; height: auto; display: block; }

/* ---- source disclosure ---------------------------------------- */

.src { border-top: 1px solid var(--border); }
.src > summary {
  cursor: pointer;
  padding: 9px 18px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  list-style: none;
  user-select: none;
}
.src > summary::-webkit-details-marker { display: none; }
.src > summary::before { content: "› "; color: var(--text-muted); }
.src[open] > summary::before { content: "⌄ "; }
.src pre {
  margin: 0;
  padding: 14px 18px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  background: color-mix(in srgb, var(--text-primary) 4%, var(--surface));
  color: var(--text-secondary);
  tab-size: 2;
}

/* ---- perf badge ---------------------------------------------- */
.metric {
  display: inline-flex; align-items: baseline; gap: 5px;
  font-size: 12px; color: var(--text-secondary);
}
.metric b { font-size: 13px; color: var(--text-primary); font-variant-numeric: tabular-nums; }

/* ---- scorecard table --------------------------------------- */
table.scores { border-collapse: collapse; width: 100%; font-size: 13px; }
table.scores th, table.scores td {
  border-bottom: 1px solid var(--border);
  padding: 9px 10px;
  text-align: center;
}
table.scores th:first-child, table.scores td:first-child { text-align: left; }
table.scores thead th { color: var(--text-secondary); font-weight: 600; }
table.scores tbody tr:hover { background: color-mix(in srgb, var(--text-primary) 3%, transparent); }
.s5 { color: var(--good); font-weight: 700; }
.s1 { color: var(--series-2); }

/* theme toggle */
.toggle {
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-secondary); border-radius: 8px;
  padding: 5px 10px; font-size: 12px; cursor: pointer; font-family: inherit;
}
.toggle:hover { color: var(--text-primary); }

/* shared crosshair tooltip used by hand-rolled demos (d3, uplot helpers) */
.lc-tip {
  position: absolute; pointer-events: none; z-index: 20;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 9px; font-size: 12px;
  color: var(--text-primary); box-shadow: 0 4px 14px rgba(0,0,0,0.12);
  white-space: nowrap; opacity: 0; transition: opacity .08s;
}
.lc-tip b { font-variant-numeric: tabular-nums; }