:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #66727c;
  --line: #d9e0e6;
  --paper: #fff;
  --page: #f6f8fa;
  --gt: #63a83f;
  --baseline: #2b67b2;
  --miraus: #d82a30;
  --gain: #b2182b;
  --suppression: #2166ac;
  font-family: Arial, Helvetica, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--page); }
button, select, input { font: inherit; }

.topbar {
  height: 58px; padding: 0 32px; display: flex; align-items: center;
  justify-content: space-between; border-bottom: 1px solid #cfd3d4; background: var(--paper);
}
.topbar div { display: flex; align-items: baseline; gap: 12px; }
.topbar strong { font-size: 19px; letter-spacing: .01em; }
.topbar div span, .evaluation-label { color: var(--muted); font-size: 11px; }

main { width: min(1520px, 100%); margin: 0 auto; padding: 22px 28px 28px; }
.toolbar {
  display: grid; grid-template-columns: 210px 300px 220px 1fr; align-items: end;
  gap: 28px; margin-bottom: 20px; padding-bottom: 18px; border-bottom: 1px solid #cfd3d4;
}
.toolbar label > span, .toolbar legend {
  display: block; margin: 0 0 7px; padding: 0; color: #555d60; font-size: 11px; font-weight: 700;
}
.toolbar fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
select {
  width: 100%; height: 35px; padding: 0 10px; border: 1px solid #bfc5c7;
  border-radius: 2px; color: var(--ink); background: var(--paper);
}
.region-control {
  display: grid; grid-template-columns: repeat(3, 1fr); height: 35px;
  border: 1px solid #bfc5c7; background: var(--paper);
}
.region-control button {
  border: 0; border-right: 1px solid var(--line); color: #5e6669;
  background: transparent; cursor: pointer; font-size: 11px;
}
.region-control button:last-child { border-right: 0; }
.region-control button:hover { background: #f3f4f2; }
.region-control button.active { color: #fff; background: #3e4548; }
.opacity-control output { float: right; color: var(--muted); font-weight: 400; }
input[type="range"] { width: 100%; accent-color: #4e5659; cursor: pointer; }
.selection-summary { justify-self: end; text-align: right; }
.selection-summary strong { display: block; font-size: 16px; }

.comparison-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.result-panel {
  min-width: 0; padding: 14px; border: 1px solid #ccd1d2;
  border-top: 3px solid #8a9295; background: var(--paper);
}
.baseline-panel { border-top-color: var(--baseline); }
.miraus-panel { border-top-color: var(--miraus); }
.error-panel { border-top-color: #4e5659; }
.panel-heading {
  height: 36px; display: flex; align-items: start; justify-content: space-between; gap: 8px;
}
.panel-heading > div { display: flex; align-items: center; gap: 8px; min-width: 0; }
.panel-index { color: #7a858e; font-size: 11px; font-weight: 700; }
.panel-heading h2 { margin: 0; font-size: 14px; line-height: 1.2; white-space: nowrap; }
.key, .error-legend span {
  display: inline-flex; align-items: center; gap: 5px; color: var(--muted); font-size: 9px; white-space: nowrap;
}
.key i, .error-legend i { width: 12px; height: 3px; display: inline-block; }
.key .gt { background: var(--gt); }
.key .baseline { background: var(--baseline); }
.key .miraus { background: var(--miraus); }
.image-frame {
  position: relative; width: 100%; aspect-ratio: 81 / 118; overflow: hidden;
  border: 1px solid #aeb4b6; background: #101314;
}
.image-frame img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block;
}
.overlay-image { transition: opacity 100ms linear; }
.error-panel .base-image { opacity: .78; }
.reference-panel > p {
  min-height: 38px; margin: 0; padding-top: 14px; color: var(--muted); font-size: 10px;
}
.metrics {
  min-height: 38px; display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding-top: 11px;
}
.metrics div { padding: 0 8px; border-right: 1px solid var(--line); }
.metrics div:first-child { padding-left: 0; }
.metrics div:last-child { padding-right: 0; border-right: 0; }
.metrics dt { color: var(--muted); font-size: 9px; }
.metrics dd { margin: 3px 0 0; font-size: 13px; font-variant-numeric: tabular-nums; }
.error-legend {
  min-height: 38px; display: flex; align-items: start; justify-content: center;
  gap: 10px; padding-top: 14px;
}
.error-legend .gain { background: var(--gain); }
.error-legend .suppression { background: var(--suppression); }
.error-legend .reference { height: 2px; background: #73797b; box-shadow: 0 0 0 1px #fff; }
footer {
  min-height: 34px; padding: 8px 28px; display: flex; justify-content: center;
  gap: 24px; border-top: 1px solid #cfd3d4; color: var(--muted); background: var(--paper); font-size: 9px;
}
footer a { color: inherit; text-decoration: none; }
footer a:hover { text-decoration: underline; }
.loading-state {
  position: fixed; right: 18px; bottom: 18px; padding: 7px 10px;
  border: 1px solid #bfc5c7; color: var(--muted); background: var(--paper); font-size: 10px;
}
.loading-state.hidden { display: none; }
button:focus-visible, select:focus-visible, input:focus-visible { outline: 2px solid #1f6975; outline-offset: 2px; }

@media (max-width: 1100px) {
  .toolbar { grid-template-columns: 180px 270px 200px 1fr; gap: 16px; }
  .comparison-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .topbar { padding: 0 16px; }
  .evaluation-label { display: none; }
  main { padding: 18px 14px; }
  .toolbar { grid-template-columns: 1fr; gap: 14px; }
  .selection-summary { justify-self: start; text-align: left; }
  .comparison-grid { grid-template-columns: 1fr; }
  footer { flex-wrap: wrap; gap: 5px 14px; }
}