:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #5b6676;
  --border: #d9dee6;
  --accent: #1f5fa8;
  --accent-soft: #e8f0fa;
  --warn-bg: #fff4e0;
  --warn-border: #f0b454;
  --above: #b3261e;
  --error: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --panel: #1b212a;
    --text: #e6eaf0;
    --muted: #9aa5b4;
    --border: #2e3642;
    --accent: #7fb0ea;
    --accent-soft: #1f2d40;
    --warn-bg: #2d2415;
    --warn-border: #a8741f;
    --above: #ff8a80;
    --error: #ff8a80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 1100px;
  padding: 24px 16px 40px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 6px; }
h2 { font-size: 1.25rem; margin: 0 0 12px; }
h2.small { font-size: 1rem; margin: 18px 0 10px; }
.lead { color: var(--muted); margin: 0 0 16px; }

.notes {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 20px;
}
.notes p { margin: 4px 0; }

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
}
@media (max-width: 760px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
.panel.wide { margin-top: 20px; }

.upload {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 22px 12px;
  border: 2px dashed var(--border);
  border-radius: 10px;
  cursor: pointer;
  text-align: center;
}
.upload:hover, .upload:focus-within { border-color: var(--accent); background: var(--accent-soft); }
.upload-title { font-weight: 600; color: var(--accent); }
.upload-hint { color: var(--muted); font-size: 0.9rem; }
.upload input { position: absolute; width: 1px; height: 1px; opacity: 0; }
body:not(.ready) .upload { opacity: 0.5; pointer-events: none; }

.field { display: flex; flex-direction: column; gap: 6px; margin-top: 16px; font-weight: 600; }
select {
  font: inherit;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}

.thumbs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.thumb {
  padding: 0;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #000;
  cursor: pointer;
  overflow: hidden;
  aspect-ratio: 1;
}
.thumb:hover, .thumb:focus-visible { border-color: var(--accent); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
body:not(.ready) .thumb { opacity: 0.5; pointer-events: none; }

#status { color: var(--muted); margin: 0 0 12px; }
#status.error { color: var(--error); }

figure { margin: 0; }
#heatmap {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1;
  display: block;
  border-radius: 8px;
}
figcaption { margin-top: 8px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; }
tr.focus td { background: var(--accent-soft); }
tr.above td:last-child { color: var(--above); font-weight: 600; }

footer { margin-top: 24px; color: var(--muted); font-size: 0.9rem; }
a { color: var(--accent); }