/*
 * A quiet dark instrument panel: slate ground, one warm accent, one thing lit at a time.
 *
 * The visual budget is spent almost entirely on the screens between blocks. During a capture
 * window the screen is deliberately close to empty — a flat mid-dark field, a small progress
 * readout pinned out of the way, and the target. Anything else on screen is somewhere else for
 * the eyes to go, and every frame where they go there is a frame that says nothing about the
 * point the participant was supposed to be looking at.
 */

:root {
  --ck-counter: #191c21;
  --ck-counter-lit: #22262d;
  --ck-card: #23272f;
  --ck-edge: #343a44;
  --ck-text: #e8e3d9;
  --ck-muted: #9aa1ad;
  --ck-brass: #d9a441;
  --ck-ember: #ff6b2c;
  --ck-cream: #f6f1e4;
  --ck-mint: #6fcf97;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--ck-counter);
  color: var(--ck-text);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  overflow: hidden;
}

/* jspsych.css sets its own font on the display element, which would otherwise win. */
.jspsych-display-element {
  height: 100%;
  width: 100%;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 17px;
  color: var(--ck-text);
}

.jspsych-content-wrapper {
  height: 100vh;
}

.jspsych-content {
  max-width: none;
  width: 100%;
}

kbd {
  display: inline-block;
  padding: 1px 7px;
  border: 1px solid var(--ck-edge);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #2c313a;
  color: var(--ck-cream);
  font: 0.85em/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ------------------------------------------------------------------ between blocks */

.ck-card {
  box-sizing: border-box;
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.5rem 3rem;
  border: 1px solid var(--ck-edge);
  border-radius: 10px;
  background: var(--ck-card);
  box-shadow: 0 24px 60px rgb(0 0 0 / 45%);
  text-align: left;
  line-height: 1.6;
}

.ck-card h1 {
  margin: 0 0 1.2rem;
  color: var(--ck-brass);
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.ck-card h2 {
  margin: 0 0 0.8rem;
  color: var(--ck-brass);
  font-size: 1.35rem;
  font-weight: 400;
}

.ck-card p {
  margin: 0 0 1rem;
  color: var(--ck-text);
}

.ck-ember {
  color: var(--ck-ember);
  font-weight: 600;
}



.ck-btn {
  margin-top: 0.5rem;
  padding: 0.7rem 2rem;
  border: 1px solid var(--ck-brass);
  border-radius: 6px;
  background: transparent;
  color: var(--ck-brass);
  font: inherit;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    background 140ms ease,
    color 140ms ease;
}

.ck-btn:hover,
.ck-btn:focus-visible {
  background: var(--ck-brass);
  color: #1a1c20;
}

/* The Prolific links are anchors styled as buttons. */
a.ck-btn {
  display: inline-block;
  text-decoration: none;
}

.ck-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

/* ------------------------------------------------------------------ end questions */

.ck-question {
  margin: 0 0 1.6rem;
  padding: 0;
  border: 0;
}

.ck-question legend {
  margin-bottom: 0.6rem;
  padding: 0;
  color: var(--ck-text);
  font-weight: 600;
}

.ck-question label {
  display: block;
  padding: 0.2rem 0;
  color: var(--ck-text);
  cursor: pointer;
}

.ck-question input[type="radio"] {
  margin-right: 0.5rem;
  accent-color: var(--ck-brass);
}

.ck-question textarea {
  display: block;
  box-sizing: border-box;
  width: 100%;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--ck-edge);
  border-radius: 4px;
  background: var(--ck-counter);
  color: var(--ck-text);
  font: inherit;
  resize: vertical;
}

.ck-question input[type="text"] {
  margin-left: 0.4rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--ck-edge);
  border-radius: 4px;
  background: var(--ck-counter);
  color: var(--ck-text);
  font: inherit;
}

/*
 * The buttons jsPsych and the saccade.js plugins render themselves.
 *
 * `.jspsych-btn` is the class the fullscreen, preview, performance and time-sync trials put on
 * their own buttons, and none of those markups are ours to change — so the class is styled to
 * match rather than each trial being handed custom HTML. Without this the participant meets a
 * default gray browser button on four of the first five screens.
 */
.jspsych-btn {
  margin-top: 0.5rem;
  padding: 0.7rem 2rem;
  border: 1px solid var(--ck-brass);
  border-radius: 6px;
  background: transparent;
  color: var(--ck-brass);
  font-family: inherit;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    background 140ms ease,
    color 140ms ease;
}

.jspsych-btn:hover,
.jspsych-btn:focus-visible {
  background: var(--ck-brass);
  color: #1a1c20;
}

/*
 * The camera-choice cards.
 *
 * Buttons, not radio-and-submit: one press, no second confirmation step, and the illustration
 * is the label rather than decoration beside it. `currentColor` on the SVG strokes means the
 * drawing follows the button's own text color through hover and both themes without a second
 * set of rules.
 */
.ck-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 210px;
  min-height: 190px;
  padding: 18px 16px 20px;
  border: 1px solid var(--ck-edge);
  border-radius: 10px;
  background: var(--ck-card);
  color: var(--ck-text);
  font: inherit;
  font-size: 0.95rem;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  transition:
    border-color 140ms ease,
    background 140ms ease,
    color 140ms ease;
}

/* The opt-out sits on its own row under the two illustrated choices, so it reads as a fallback
   rather than a third option of equal standing. */
.ck-choice-plain {
  flex-basis: 100%;
  min-height: 0;
  width: auto;
  max-width: 14rem;
  margin: 2px auto 0;
  padding: 10px 22px;
}

.ck-choice:hover,
.ck-choice:focus-visible {
  border-color: var(--ck-brass);
  color: var(--ck-brass);
  background: var(--ck-counter-lit);
}

.ck-choice:focus-visible {
  outline: 2px solid var(--ck-brass);
  outline-offset: 2px;
}

.ck-choice svg {
  display: block;
}

/* jsPsych lays its button group out inline; let the cards sit side by side and wrap. */
#jspsych-html-button-response-btngroup {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
  margin-top: 8px;
}

.jspsych-btn:disabled {
  border-color: var(--ck-edge);
  color: var(--ck-muted);
  background: transparent;
  cursor: not-allowed;
}

/* The "press space" line on the between-block screens: present, not shouted. */
.ck-advance {
  margin-top: 1.4rem;
  color: var(--ck-muted);
  font-size: 0.92rem;
}

.ck-status {
  color: var(--ck-muted);
  font-style: italic;
}



/* The fixation dot for the live frame-rate check. A face has to stay in view for that
   measurement to mean anything, so the participant is given somewhere to look. */
.ck-center-dot {
  width: 14px;
  height: 14px;
  margin: 1.5rem auto 0.5rem;
  border-radius: 50%;
  background: var(--ck-brass);
}

/* The drain progress bar, shown only when a slow machine's encoder queue is behind. */
.ck-bar {
  height: 6px;
  margin-top: 0.8rem;
  border-radius: 3px;
  background: #2c313a;
  overflow: hidden;
}

.ck-bar > div {
  height: 100%;
  width: 0%;
  background: var(--ck-brass);
  transition: width 200ms ease;
}






/* ------------------------------------------------------------------ the task screen */

.ck-stage {
  position: fixed;
  inset: 0;
  /* A flat field, a shade lighter than the cards: a gradient or a texture would give the eyes
     structure to drift onto between targets. */
  background: var(--ck-counter-lit);
}

/* The same field behind the display, so the blank between two task trials matches the trials
   instead of dropping to the darker page ground. Toggled by `on_trial_start`. */
html.ck-task,
html.ck-task body {
  background: var(--ck-counter-lit);
}

.ck-hud {
  position: fixed;
  top: 14px;
  left: 50%;
  display: flex;
  gap: 2.2rem;
  transform: translateX(-50%);
  opacity: 0.4;
  pointer-events: none;
}

.ck-hud-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.ck-hud-label {
  color: var(--ck-muted);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.ck-hud-value {
  color: var(--ck-cream);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}

.ck-target {
  position: fixed;
  display: grid;
  place-items: center;
  width: 0;
  height: 0;
}

.ck-target > * {
  grid-area: 1 / 1;
}

/* The target appears and settles. */

/*
 * The target appears at full opacity on its first frame and settles to size.
 *
 * The luminance onset has to be a step: saccade latency to a stimulus that fades in is longer
 * than to one that simply appears, by an amount nothing downstream can recover. Only the scale
 * animates, and it never moves the center.
 */
.ck-bullseye {
  position: relative;
  display: block;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ck-brass);
  opacity: 1;
  transform: scale(1.6);
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.ck-target-settled .ck-bullseye,
.ck-target-capturing .ck-bullseye {
  transform: scale(1);
}

/*
 * Thaler, Schutz, Goodale & Gegenfurtner (2013): a disc with a cross cut through it and a small
 * central dot holds fixation more tightly than a plain dot or a cross alone. The cross is drawn
 * in the counter color so it reads as a cut rather than a line.
 */
.ck-bullseye-cross {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(var(--ck-counter-lit), var(--ck-counter-lit)) center / 100% 6px no-repeat,
    linear-gradient(var(--ck-counter-lit), var(--ck-counter-lit)) center / 6px 100% no-repeat;
}

.ck-bullseye-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  margin: -3px 0 0 -3px;
  border-radius: 50%;
  background: var(--ck-cream);
  transition: background 60ms linear;
}

/*
 * A faint rail the moving target runs along.
 *
 * Deliberately only just visible. A strong line would give the eye something to track *instead*
 * of the target — smooth pursuit will happily lock onto a static edge — and the whole point of
 * the trial is that the eye follows the moving target.
 */
.ck-rail {
  position: fixed;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--ck-edge);
  opacity: 0.5;
  transform: translateY(-0.5px);
  pointer-events: none;
}

/* The moving target is positioned with a transform, so it must not also animate one. */
.ck-moving .ck-bullseye {
  transition: none;
}

/* The probe. Six pixels across, so it cannot be caught out of the corner of an eye. */
.ck-core-probe {
  background: var(--ck-ember);
  box-shadow: 0 0 6px 2px rgb(255 107 44 / 55%);
}

.ck-hit .ck-bullseye {
  background: var(--ck-mint);
}

.ck-miss .ck-bullseye {
  background: #7d5a5a;
}

@media (prefers-reduced-motion: reduce) {
  .ck-bullseye {
    transition-duration: 1ms;
  }
}

/* The instructions' picture of the target, as it usually is and with the probe. */
.ck-demo-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem 3rem;
  margin: 1.4rem 0;
}

.ck-demo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.ck-demo .ck-bullseye {
  transform: none;
  transition: none;
}

.ck-demo-label {
  font-size: 0.9rem;
}

/* DEMO */
.ck-demo-note { color: #8a6d00; font-style: italic; }
.ck-demo-note a { color: inherit; }