/* Lab 1 — handout styles. One accent colour, serif text, sans-serif controls. */

:root {
  --paper: #fbfaf6;
  --panel: #f2efe6;
  --ink: #1e1d1a;
  --ink-2: #58554d;
  --rule: #d9d4c7;
  --accent: #8e1f17;
  --btn-border: #8b877c;

  /* one colour per method, chosen to stand out on a greyscale MRI */
  --c-manual: #ffb000;
  --c-manual2: #b48cff;
  --c-otsu: #1fc3d3;
  --c-snake: #ff4fa3;
  --c-grow: #7bd148;
  --c-truth: #ffffff;

  --serif: "Source Serif 4", Charter, Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--serif);
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
a { color: var(--accent); }
p, li { max-width: 72ch; }
b, strong { font-weight: 600; }

/* ---------- masthead ---------- */
.masthead { border-bottom: 1px solid var(--rule); padding: 44px 0 26px; }
.kicker {
  margin: 0 0 10px;
  font: 600 13px/1 var(--sans);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
}
h1 {
  margin: 0 0 14px;
  font-size: clamp(30px, 4.4vw, 42px);
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -.01em;
}
.lede { font-size: 19px; color: #33312c; margin: 0 0 10px; }
.meta { font: 15px/1.5 var(--sans); color: var(--ink-2); margin: 0; }
.toc { display: flex; flex-wrap: wrap; gap: 6px 20px; margin-top: 20px; font: 15px var(--sans); }
.toc a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--rule); }
.toc a:hover { border-bottom-color: var(--ink); }
.toc a span { color: var(--accent); font-weight: 600; margin-right: 5px; }

/* ---------- sections ---------- */
h2 {
  margin: 60px 0 12px;
  padding-top: 14px;
  border-top: 2px solid var(--ink);
  font-size: 27px;
  line-height: 1.25;
  font-weight: 600;
}
h2 .num { color: var(--accent); margin-right: .4em; }
h3 { font-size: 19px; margin: 28px 0 6px; font-weight: 600; }
.katex-display { margin: 14px 0; overflow-x: auto; overflow-y: hidden; padding: 4px 0; }

.note {
  max-width: 76ch;
  margin: 20px 0;
  padding: 12px 18px;
  background: var(--panel);
  border-left: 3px solid var(--accent);
}
.note p { margin: 0; }
.note p + p { margin-top: 8px; }

ol.tasks { list-style: none; padding: 0; margin: 16px 0; }
ol.tasks li { margin: 0 0 8px; padding-left: 3em; text-indent: -3em; }
ol.tasks li > b:first-child {
  display: inline-block;
  width: 3em;
  text-indent: 0;
  font: 600 15px var(--sans);
  color: var(--accent);
}

.questions h3 { font: 600 13px/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); margin-top: 26px; }
.questions ol { padding-left: 1.4em; margin: 8px 0; }
.questions li { margin-bottom: 4px; }

details.discuss {
  max-width: 76ch;
  margin: 18px 0 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 8px 0;
}
details.discuss summary { cursor: pointer; font: 600 15px var(--sans); color: var(--ink); }
details.discuss[open] summary { margin-bottom: 6px; }
details.discuss ul { padding-left: 1.2em; margin: 6px 0; }
details.discuss li { margin-bottom: 6px; }

/* ---------- case picker ---------- */
.cases {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 14px;
  margin: 18px 0 8px;
}
.case {
  display: block;
  width: 100%;
  padding: 0;
  text-align: left;
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 2px;
  cursor: pointer;
}
.case:hover { border-color: var(--btn-border); }
.case[aria-pressed="true"] { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.case img, .case .blank {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #000;
}
.case .blank {
  display: grid;
  place-items: center;
  background: repeating-linear-gradient(45deg, #ece8dd 0 6px, #f5f2ea 6px 12px);
  color: var(--ink-2);
  font: 600 14px var(--sans);
}
.case .txt { display: block; padding: 8px 10px 10px; font: 14px/1.4 var(--sans); }
.case .txt b { display: block; font-size: 15px; }
.case .txt span { color: var(--ink-2); }
.credit { font: 13px/1.5 var(--sans); color: var(--ink-2); margin: 6px 0 0; }

/* ---------- interactive panels ---------- */
.lab {
  display: grid;
  grid-template-columns: minmax(0, 520px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  margin: 24px 0 8px;
}
.lab.wide-right { grid-template-columns: minmax(0, 500px) minmax(0, 1fr); }
@media (max-width: 880px) {
  .lab, .lab.wide-right { grid-template-columns: minmax(0, 1fr); }
}
.fig { margin: 0; }
canvas.view {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
  border: 1px solid #000;
  touch-action: none;
  cursor: crosshair;
  -webkit-user-select: none;
  user-select: none;
}
figcaption { margin-top: 8px; font: 14px/1.45 var(--sans); color: var(--ink-2); }
figcaption b { color: var(--ink); }

.controls { font: 15px/1.45 var(--sans); min-width: 0; }
.controls fieldset {
  min-width: 0;
  margin: 0;
  padding: 10px 0 12px;
  border: 0;
  border-top: 1px solid var(--rule);
}
.controls fieldset:first-child { border-top: 0; padding-top: 0; }
.controls legend {
  float: left;
  width: 100%;
  padding: 0 0 7px;
  font: 600 12px/1.2 var(--sans);
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.controls legend + * { clear: both; }
.small { font-size: 13.5px; color: var(--ink-2); margin: 6px 0 0; }
.warn { color: var(--accent); }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; align-items: center; }

button {
  font: 15px/1.2 var(--sans);
  padding: 6px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  cursor: pointer;
}
button:hover:not(:disabled) { background: #f1eee5; }
button.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
button.primary:hover:not(:disabled) { background: #3a3832; }
button:disabled { opacity: .45; cursor: default; }
button:focus-visible, .case:focus-visible, input:focus-visible + span, select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* segmented radio buttons */
.seg {
  display: inline-flex;
  flex-wrap: wrap;
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  overflow: hidden;
  background: #fff;
}
.seg label { position: relative; cursor: pointer; user-select: none; border-left: 1px solid var(--btn-border); }
.seg label:first-child { border-left: 0; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: block; padding: 5px 11px; }
.seg input:checked + span { background: var(--ink); color: #fff; }
.seg input:focus-visible + span { outline-offset: -3px; }

label.check { display: flex; gap: 8px; align-items: baseline; margin: 6px 0; cursor: pointer; }
label.check input { margin: 0; accent-color: var(--accent); transform: translateY(1px); }

.slider { display: grid; grid-template-columns: 1fr auto; gap: 0 8px; margin: 8px 0 2px; align-items: baseline; }
.slider output { font: 14px var(--mono); color: var(--ink); }
.slider input { grid-column: 1 / -1; width: 100%; margin: 4px 0 0; accent-color: var(--accent); }
.slider .hint { grid-column: 1 / -1; font-size: 13px; color: var(--ink-2); }

select { font: 15px var(--sans); padding: 4px 6px; border: 1px solid var(--btn-border); border-radius: 3px; background: #fff; max-width: 100%; }

dl.stats { display: grid; grid-template-columns: auto 1fr; gap: 3px 14px; margin: 0; }
dl.stats dt { color: var(--ink-2); }
dl.stats dd { margin: 0; font: 14px/1.45 var(--mono); }

.sw {
  display: inline-block;
  width: .85em;
  height: .85em;
  vertical-align: -.08em;
  border: 1px solid rgba(0, 0, 0, .55);
  background: var(--c, #999);
}
.sw.manual { --c: var(--c-manual); }
.sw.manual2 { --c: var(--c-manual2); }
.sw.otsu { --c: var(--c-otsu); }
.sw.snake { --c: var(--c-snake); }
.sw.grow { --c: var(--c-grow); }
.sw.truth { --c: var(--c-truth); }
.sw.both { --c: #f4f1e8; }
.sw.edge { --c: #ff9a2e; }
.sw.balloon { --c: #7bd148; }
.sw.internal { --c: #4da3ff; }

#m-loupe { display: block; width: 176px; height: 176px; background: #000; image-rendering: pixelated; }
.loupe-row { display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
.loupe-row .small { flex: 1 1 140px; margin: 0; }

/* histogram */
.hist { margin: 0 0 6px; }
.hist canvas { display: block; width: 100%; height: auto; background: #fff; border: 1px solid var(--rule); touch-action: none; cursor: ew-resize; }

/* pipeline strip and thumbnails */
.strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
  margin: 18px 0 4px;
}
.strip figure { margin: 0; }
.strip canvas { display: block; width: 100%; height: auto; background: #000; border: 1px solid #000; }
.strip figcaption { font-size: 13px; margin-top: 5px; }
.strip figure.off canvas { opacity: .35; }

/* tabs */
.tabs { display: flex; gap: 0; margin: 26px 0 0; border-bottom: 1px solid var(--rule); }
.tabs button {
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: none;
  padding: 8px 14px;
  margin-bottom: -1px;
  color: var(--ink-2);
  font-weight: 600;
}
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.tabs button:hover:not(:disabled) { background: none; color: var(--ink); }

/* tables */
.table-wrap { overflow-x: auto; margin: 14px 0; }
table { border-collapse: collapse; width: 100%; font: 14.5px/1.4 var(--sans); }
th, td { padding: 7px 10px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--rule); }
thead th { border-bottom: 1.5px solid var(--ink); font-weight: 600; white-space: nowrap; }
tbody th { font-weight: 600; }
td.num { font-family: var(--mono); font-size: 13.5px; text-align: right; white-space: nowrap; }
td.dim { color: var(--ink-2); }
td.how { color: var(--ink-2); font-size: 13.5px; min-width: 16em; }
table.matrix td.num { min-width: 5em; }
.empty { font: 15px var(--sans); color: var(--ink-2); padding: 14px 16px; background: var(--panel); margin: 12px 0; max-width: none; }

.ramp { display: inline-block; width: 120px; height: 10px; vertical-align: middle; border: 1px solid rgba(0,0,0,.4);
  background: linear-gradient(90deg, #2f6bff, #d14cc8, #ffe14d); }

ol.refs { padding-left: 1.4em; font-size: 15.5px; }
ol.refs li { margin-bottom: 6px; }

footer { border-top: 1px solid var(--rule); margin-top: 70px; padding: 22px 0 40px; font: 14px/1.5 var(--sans); color: var(--ink-2); }
footer p { margin: 0 0 6px; max-width: none; }

/* ground-truth upload */
.truth-row { margin: 14px 0 0; padding: 10px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font: 15px/1.45 var(--sans); }
.truth-row p { margin: 0; max-width: none; }

/* Dice scorecard */
.scores { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin: 10px 0 6px; }
.score { background: #fff; border: 1px solid var(--rule); padding: 10px 14px; font: 14px/1.4 var(--sans); }
.score .pair { color: var(--ink-2); }
.score .val { display: block; font: 600 28px/1.2 var(--mono); color: var(--ink); margin-top: 4px; }
.score .val.missing { font: 14px/1.4 var(--sans); color: var(--ink-2); margin-top: 8px; }
.score.truth { border-color: var(--ink); }