/* Quiet, light-box styling: nothing on screen competes with the image being searched. */
:root {
  --lightbox: #E9EDF1;
  --paper: #FFFFFF;
  --ink: #1D2731;
  --muted: #5E6C78;
  --line: #C7D0D8;
  --signal: #1F6E8C;
  --warn-bg: #FFF4D6;
  --warn-ink: #6B4E00;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--lightbox);
}
* { box-sizing: border-box; }
body { margin: 0; line-height: 1.55; }
.banner { background: var(--warn-bg); color: var(--warn-ink); padding: .6rem 1rem; font-size: .9rem; text-align: center; }
.page { max-width: 40rem; margin: 2.5rem auto; padding: 2rem; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; }
h1 { font-size: 1.75rem; line-height: 1.2; margin: 0 0 1rem; font-weight: 600; }
.lede { font-size: 1.125rem; color: var(--muted); }
.meta { color: var(--muted); font-size: .9rem; }
fieldset { border: 0; padding: 0; margin: 1.25rem 0; }
legend { font-weight: 600; margin-bottom: .5rem; }
label { display: block; margin: .9rem 0; }
.stack label > input, .stack label > select { display: block; margin-top: .3rem; width: 100%; max-width: 16rem; padding: .5rem; font: inherit; border: 1px solid var(--line); border-radius: 4px; }
.choice { display: flex; gap: .5rem; align-items: center; margin: .4rem 0; }
.scale label { display: inline-block; margin: 0 .2rem .3rem 0; }
.scale input { position: absolute; opacity: 0; }
.scale label span { display: inline-flex; width: 2.5rem; height: 2.5rem; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 4px; cursor: pointer; background: var(--paper); }
.scale input:checked + span { background: var(--signal); color: #fff; border-color: var(--signal); }
.scale input:focus-visible + span, button:focus-visible, a:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; }
button, .button { display: inline-block; margin-top: 1rem; padding: .7rem 1.4rem; font: inherit; font-weight: 600; color: #fff; background: var(--signal); border: 0; border-radius: 4px; cursor: pointer; text-decoration: none; }
button:disabled { opacity: .5; }
.examples { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.examples img { width: 100%; height: auto; border: 1px solid var(--line); }
.examples figcaption { font-size: .9rem; color: var(--muted); }
table { border-collapse: collapse; width: 100%; margin: 1rem 0; }
th, td { text-align: left; padding: .4rem; border-bottom: 1px solid var(--line); }

/* Trial screen */
.trial { max-width: 1240px; margin: 0 auto; padding: 1rem; }
.trial-head { min-height: 5.5rem; }
.clue { font-size: 1.3rem; line-height: 1.4; margin: .3rem 0 .8rem; max-width: 60rem; }
.stage { position: relative; display: inline-block; max-width: 100%; }
/* Whole image must fit on screen: scrolling to reach a target would add time unrelated to language. */
#stim { display: block; max-width: 100%; max-height: calc(100vh - 12rem); width: auto; height: auto; cursor: crosshair; visibility: hidden; user-select: none; touch-action: manipulation; }
#stim.live { visibility: visible; }
.mark { position: absolute; width: 44px; height: 44px; margin: -22px 0 0 -22px; border: 3px solid var(--signal); border-radius: 50%; pointer-events: none; }
.status { min-height: 1.5rem; font-weight: 600; }
.effort { background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 1rem; max-width: 36rem; }
.effort .ends { display: flex; justify-content: space-between; font-size: .85rem; color: var(--muted); max-width: 27rem; }
@media (max-width: 600px) { .examples { grid-template-columns: 1fr; } .page { margin: 0; border-radius: 0; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
.trial-top { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.quit { background: none; color: var(--muted); border: 1px solid var(--line); font-weight: 400; font-size: .9rem; padding: .45rem .9rem; margin-top: 0; }
.quit:hover { color: var(--ink); border-color: var(--muted); }
.error { color: #9b1c1c; font-weight: 600; }
/* Corsi board: nine squares at fixed positions, lit in sequence. */
.corsi-board { position: relative; width: min(100%, 720px); aspect-ratio: 3 / 2; margin: 1rem 0; background: #2b3540; border-radius: 6px; }
.corsi-block { position: absolute; width: 11%; aspect-ratio: 1; transform: translate(-50%, -50%); margin: 0; padding: 0; background: #5b7085; border: 0; border-radius: 4px; cursor: pointer; }
.corsi-block:disabled { cursor: default; opacity: 1; }
.corsi-block.lit { background: #f2c94c; }
.corsi-block.picked { background: #9ad1ff; }
/* Reading passages */
.reading .passage { font-size: 1.15rem; line-height: 1.6; max-width: 42rem; }
.fatigue input[type=range] { width: 100%; max-width: 30rem; }
.fatigue .ends { display: flex; justify-content: space-between; max-width: 30rem; font-size: .85rem; color: var(--muted); }
.fatigue output { font-weight: 600; color: var(--ink); }
.more-tasks { padding-left: 1.2rem; }
/* Rule cards and operation span */
.rule-stage #stim { max-height: calc(100vh - 20rem); }
.rule-answer .pick, .ospan .pick { margin-right: .6rem; }
.ospan .sum { font-size: 2rem; font-weight: 600; letter-spacing: .05em; }
.ospan .word { font-size: 2.4rem; font-weight: 700; margin: 2rem 0; }
.ospan .choices { display: flex; flex-wrap: wrap; gap: .5rem; }
.choice-word { margin: 0; background: var(--paper); color: var(--ink); border: 1px solid var(--line); font-weight: 500; }
.choice-word:disabled { opacity: .4; }
.ospan .picked { min-height: 1.5rem; font-weight: 600; }
.retention-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr)); gap: .2rem 1rem; }