:root {
  --page: #f4f5f7;
  --surface: #ffffff;
  --line: #d9dde3;
  --text: #1c2026;
  --muted: #5d6673;
  --accent: #1976d2;
  --accent-dark: #125ea8;
  --accent-soft: #e2edf8;
  --slot: #f4f4f4;
  --slot-line: #7c7c7c;
  --warn-soft: #fff1f0;
  --radius: 6px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

h1, h2, p, figure, dl, dd { margin: 0; }
a { color: var(--accent-dark); }
.muted { color: var(--muted); }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.top h1 { font-size: 18px; line-height: 1.3; }
.authors { color: var(--muted); font-size: 13px; }
.top-links { display: flex; gap: 8px; flex-shrink: 0; }

main { max-width: 1360px; margin: 0 auto; padding: 16px 24px 40px; }
.lead { max-width: 900px; margin-bottom: 14px; }

button, .button {
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  padding: 6px 12px;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .button:hover { border-color: var(--accent); }
button:focus-visible, .button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding: 8px 14px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}
button.primary:hover { background: var(--accent-dark); }
button.primary:disabled { background: #c9ced6; border-color: #c9ced6; box-shadow: none; cursor: not-allowed; }
button.secondary { color: var(--accent-dark); }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  margin-bottom: 14px;
}
.toolbar-group { display: flex; align-items: center; gap: 8px; }
.toolbar-label { font-size: 13px; font-weight: 600; color: var(--muted); }
.tabs { display: flex; flex-wrap: wrap; gap: 4px; }
.tab { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.2; padding: 5px 10px; }
.tab-code { font-size: 11px; color: var(--muted); font-weight: 600; }
.tab-name { font-size: 14px; }
.tab[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.tab[aria-pressed="true"] .tab-code { color: #d6e6f7; }
.thumbs { display: flex; gap: 4px; }
.thumb { padding: 2px; line-height: 0; }
.thumb img { width: 54px; height: 36px; object-fit: cover; border-radius: 3px; }
.thumb[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
#restart { margin-left: auto; }

/* Original photo and notes on the left, the interface on the right. */
.layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 14px; align-items: start; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }
.panel h2 { font-size: 13px; font-weight: 700; margin-bottom: 8px; }
.side { display: grid; gap: 14px; }
.side canvas { display: block; width: 100%; height: auto; border-radius: 4px; }
.task-text { font-size: 12px; line-height: 1.45; margin-top: 8px; }
.about-name { font-weight: 600; margin-bottom: 4px; }
#about-ui p { font-size: 14px; }

.params { display: grid; grid-template-columns: auto 1fr; gap: 3px 8px; margin-top: 8px; font-size: 12px; color: var(--muted); align-items: center; }
.bar { display: block; height: 6px; border-radius: 3px; background: #e7eaee; position: relative; }
.bar::after { content: ""; position: absolute; left: 50%; top: -2px; bottom: -2px; width: 1px; background: #9aa3af; }
.bar-fill { display: block; height: 100%; border-radius: 3px; background: var(--accent); }

.workspace { min-height: 420px; position: relative; }
.workspace.busy > * { opacity: 0.35; pointer-events: none; }
.workspace.busy::after {
  content: "Optimizing…";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-weight: 600;
  color: var(--accent-dark);
}
.progress { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; margin-bottom: 12px; }

/* Photos in the center; the listwise interfaces add a column for their input. */
.work-side { display: grid; grid-template-columns: minmax(0, 1fr) 324px; gap: 16px; align-items: start; }
.side-input { display: grid; gap: 10px; }
.controls { margin-top: 10px; }
.message { color: #b3261e; min-height: 22px; font-size: 14px; text-align: center; }
.actions { display: flex; gap: 10px; justify-content: center; margin-top: 4px; }
.side-input .controls { margin-top: 0; }
.side-input .actions { justify-content: space-between; }
.side-input .actions button { flex: 1; padding: 8px 6px; font-size: 13px; }

.option {
  background: var(--surface);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.22), 0 1px 1px rgba(0, 0, 0, 0.12);
}
.option canvas { display: block; width: 100%; height: auto; }
.option figcaption { font-size: 13px; font-weight: 600; padding: 8px 10px; }

.stage-single { max-width: 600px; margin: 0 auto; }
.stage-single .statement { text-align: center; margin: 14px 0 6px; }
.stage-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.stage-grid .statement { font-size: 12.5px; text-align: center; padding: 8px 10px 0; }
.stage-grid .rating { flex-direction: column; align-items: stretch; gap: 2px; padding: 4px 16px 10px; }
.stage-grid .rating .check { justify-content: center; }

.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.pair-item { display: grid; gap: 10px; justify-items: center; }
.pair-item .option { width: 100%; }
.choice { display: grid; gap: 8px; justify-items: center; margin-top: 10px; }
.result { max-width: 900px; margin-bottom: 12px; }

.rating { display: flex; align-items: center; gap: 12px; margin-top: 6px; }
.rating-scale { flex: 1; min-width: 0; }
.scale { width: 100%; accent-color: var(--accent); margin: 0; }
.scale-ends { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); }
.check { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; white-space: nowrap; cursor: pointer; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; margin: 0; }

/* The ranking board of UI4 to UI6. */
.usage { font-size: 13px; line-height: 1.4; }
.board { display: grid; gap: 8px; margin-top: 8px; }
.tray { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.slot { height: 62px; border: 2px dashed var(--slot-line); border-radius: 10px; background: var(--slot); display: grid; place-items: center; }
.rank-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 66px;
  padding: 3px 10px 3px 4px;
  border: 2px dashed var(--slot-line);
  border-radius: 10px;
  background: var(--slot);
}
.rank-row.unknown { background: var(--warn-soft); }
.rank-row.over, .rank-row.armed:hover { background: var(--accent-soft); }
.tray.over .slot:empty { background: var(--accent-soft); }
.rank-row.armed, .tray:has(~ .armed) { cursor: pointer; }
.rank-boxes { display: flex; gap: 5px; }
.rank-label { font-style: italic; color: gray; font-size: 15px; white-space: nowrap; }
.chip-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 52px;
  height: 52px;
  padding: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  color: darkblue;
  background: var(--slot);
  border: 2px solid var(--slot-line);
  border-radius: 10px;
  cursor: grab;
}
/* The three lines that mark the box as draggable. */
.chip-box::before {
  content: "";
  width: 26px;
  height: 11px;
  background: repeating-linear-gradient(#a0a0a0 0 1.5px, transparent 1.5px 4.75px);
}
.chip-box[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); }

.runs { margin-top: 14px; }
#runs-table { overflow-x: auto; }
table { border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 5px 28px 5px 0; border-bottom: 1px solid var(--line); vertical-align: middle; white-space: nowrap; }
th { font-size: 12px; color: var(--muted); font-weight: 600; }
.run-thumb canvas { display: block; width: 72px; height: auto; border-radius: 3px; }

.notes { margin-top: 20px; max-width: 900px; display: grid; gap: 8px; font-size: 14px; }
.notes h2 { font-size: 15px; }

@media (max-width: 1120px) {
  .work-side { grid-template-columns: minmax(0, 1fr); }
  .side-input { max-width: 360px; margin: 0 auto; width: 100%; }
}
@media (max-width: 980px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .side { grid-template-columns: repeat(2, minmax(0, 1fr)); order: 2; }
  .side #about-ui { grid-column: 1 / -1; }
  .top { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 560px) {
  main { padding: 12px; }
  .top { padding: 12px; }
  #restart { margin-left: 0; }
  .stage-grid, .pair { gap: 8px; }
  .stage-grid .rating { padding: 4px 8px 8px; }
  .scale-ends { font-size: 10px; }
}