/* Shared design tokens and chrome for all pages (index, about, help).
   Keep index.html's chart/predictor-specific rules here too, even though
   about.html/help.html don't use them -- one stylesheet, one source of
   truth for the palette, is worth a few unused rules on the info pages. */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1d23;
  --muted: #6b7280;
  --border: #e2e5ea;
  --panel: #f7f8fa;
  --predicted: #2563eb;
  --observed: #dc2626;
  --ml: #0d9488;
  --high: #059669;
  --low: #d97706;
  --accent: #2563eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e7e9ec;
    --muted: #9aa1ab;
    --border: #2a2e35;
    --panel: #1b1e24;
    --predicted: #60a5fa;
    --observed: #f87171;
    --ml: #2dd4bf;
    --high: #34d399;
    --low: #fbbf24;
    --accent: #60a5fa;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Site header, shared across all pages */
.site-header { border-bottom: 1px solid var(--border); background: var(--panel); }
.site-header-inner {
  max-width: 920px; margin: 0 auto; padding: 14px 20px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 8px 20px;
}
.brand { font-weight: 700; color: var(--fg); text-decoration: none; font-size: 1rem; }
.navlinks { display: flex; gap: 18px; }
.navlinks a {
  color: var(--muted); text-decoration: none; font-size: 0.88rem; font-weight: 600;
}
.navlinks a:hover, .navlinks a[aria-current="page"] { color: var(--accent); }

.wrap { max-width: 920px; margin: 0 auto; padding: 24px 20px 60px; }
h1 { font-size: 1.25rem; margin: 0 0 4px; }
h2 { font-size: 1.05rem; margin: 28px 0 8px; }
h2:first-child { margin-top: 0; }
.sub { color: var(--muted); font-size: 0.9rem; margin: 0 0 20px; }
p { line-height: 1.6; }
.wrap p { max-width: 70ch; }
.wrap ul { line-height: 1.6; max-width: 70ch; }

.controls {
  display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap;
  padding: 16px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; margin-bottom: 18px;
}
.field { display: flex; flex-direction: column; gap: 4px; }
label { font-size: 0.78rem; color: var(--muted); }
input, select, button {
  font: inherit; padding: 7px 10px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg); color: var(--fg);
}
button {
  background: var(--accent); color: #fff; border: none; cursor: pointer;
  padding: 8px 16px; font-weight: 600;
}
button:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.6; cursor: default; }
#status { font-size: 0.85rem; color: var(--muted); margin-left: auto; align-self: center; }
#error {
  display: none; background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5;
  padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 0.9rem;
}
canvas { width: 100%; height: 340px; display: block; border: 1px solid var(--border);
         border-radius: 10px; background: var(--panel); cursor: crosshair; }
.chart-wrap { position: relative; }
.chart-tooltip {
  position: absolute; top: 10px; pointer-events: none;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px; font-size: 0.8rem; line-height: 1.5; white-space: nowrap;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15); z-index: 2;
}
.chart-tooltip .time {
  font-weight: 600; font-variant-numeric: tabular-nums; margin-bottom: 3px;
}
.chart-tooltip .row { display: flex; align-items: center; gap: 6px; }
.chart-tooltip .row .sw { width: 10px; height: 10px; border-radius: 2px; flex: none; }
.chart-tooltip .row b { font-variant-numeric: tabular-nums; margin-left: auto; padding-left: 10px; }
.legend { display: flex; gap: 18px; font-size: 0.82rem; color: var(--muted); margin: 8px 0 20px; flex-wrap: wrap; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend span[hidden] { display: none; } /* the [hidden] UA default loses to the rule above without this */
.swatch { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }
.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px;
}
.panel h2 { font-size: 0.95rem; margin: 0 0 10px; }
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td { text-align: left; padding: 4px 6px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; }
.tag { font-size: 0.72rem; padding: 1px 7px; border-radius: 999px; font-weight: 600; }
.tag.high { background: color-mix(in srgb, var(--high) 20%, transparent); color: var(--high); }
.tag.low  { background: color-mix(in srgb, var(--low) 20%, transparent); color: var(--low); }
.stat { display: flex; justify-content: space-between; padding: 3px 0; font-size: 0.88rem; }
.stat b { font-weight: 600; }
.note { font-size: 0.82rem; color: var(--muted); line-height: 1.5; }
.badge {
  display: inline-block; font-size: 0.72rem; font-weight: 600; padding: 2px 9px;
  border-radius: 999px; margin-left: 8px; vertical-align: 1px;
}
.badge.forecast { background: color-mix(in srgb, var(--ml) 18%, transparent); color: var(--ml); }
.badge.historic { background: color-mix(in srgb, var(--predicted) 16%, transparent); color: var(--predicted); }
.vsplit { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.vsplit h3 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--muted); margin: 0 0 4px; font-weight: 600; grid-column: span 1;
}
footer { margin-top: 28px; font-size: 0.78rem; color: var(--muted); }
a { color: var(--accent); }

/* Info pages (about.html, help.html) */
.callout {
  border: 1px solid var(--border); background: var(--panel); border-radius: 10px;
  padding: 14px 16px; margin: 16px 0;
}
.callout.warn {
  border-color: color-mix(in srgb, var(--low) 45%, var(--border));
  background: color-mix(in srgb, var(--low) 10%, var(--panel));
}
.callout h3 { margin: 0 0 6px; font-size: 0.92rem; }
.callout p:last-child { margin-bottom: 0; }
dl.key { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; font-size: 0.92rem; }
dl.key dt { color: var(--muted); }
dl.key dd { margin: 0; }
.chip-row { display: flex; gap: 10px; align-items: center; margin: 10px 0; flex-wrap: wrap; }