/* styles.css — high-contrast styling for the spatial audio demo.
   Respects prefers-color-scheme and prefers-contrast. The ARIA live region
   is visually hidden but available to screen readers. */

:root {
  --bg: #ffffff;
  --fg: #101010;
  --accent: #0050b3;
  --panel: #f2f2f2;
  --border: #101010;
  --kbd-bg: #e8e8e8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #ffffff;
    --accent: #4dd2ff;
    --panel: #121212;
    --border: #ffffff;
    --kbd-bg: #1e1e1e;
  }
}

/* Extra emphasis when the user asks for more contrast. */
@media (prefers-contrast: more) {
  :root {
    --panel: var(--bg);
    --border: var(--fg);
  }
  * {
    outline-color: var(--fg);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1.5rem;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 18px;
  line-height: 1.5;
  background: var(--bg);
  color: var(--fg);
}

h1 {
  font-size: 1.8rem;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.25rem;
  margin: 0 0 0.75rem;
}

.intro {
  max-width: 60ch;
}

main {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-start;
}

section {
  background: var(--panel);
  border: 2px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
}

.controls,
.readout,
.help {
  flex: 1 1 280px;
  min-width: 260px;
}

.world {
  flex: 0 0 auto;
}

/* Full-width explanatory section below the interactive panels. */
.about {
  margin-top: 1.5rem;
  max-width: 70ch;
}

.about h3 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.35rem;
}

.about a {
  color: var(--accent);
}

/* Interactive controls: large, high-contrast, clearly focusable. */
button {
  font: inherit;
  font-weight: 700;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg);
  border: 2px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.1);
}

.status {
  margin-left: 0.75rem;
  font-weight: 600;
}

fieldset {
  margin-top: 1rem;
  border: 2px solid var(--border);
  border-radius: 4px;
  padding: 0.75rem 1rem;
}

legend {
  font-weight: 700;
  padding: 0 0.4rem;
}

.cue-toggles label {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 0.5rem;
  padding: 0.5rem 0;
  cursor: pointer;
}

/* Divider between toggles so each reads (and looks) like its own block. */
.cue-toggles label + label {
  border-top: 1px solid var(--border);
}

.cue-name {
  grid-column: 2;
  grid-row: 1;
  font-weight: 600;
}

/* Description drops to its own line under the name, checkbox stays aligned. */
.cue-desc {
  grid-column: 2;
  grid-row: 2;
  font-size: 0.85em;
  opacity: 0.85;
}

.cue-toggles input[type="checkbox"] {
  grid-column: 1;
  grid-row: 1;
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--accent);
}

/* ITD exaggeration tuning: label on top, full-width slider, factor readout. */
.itd-tuning label {
  display: block;
  cursor: pointer;
}

.itd-tuning .cue-name,
.itd-tuning .cue-desc {
  display: block;
}

.itd-tuning .cue-name {
  font-weight: 600;
}

.itd-tuning kbd {
  font-size: 0.85em;
}

.itd-tuning input[type="range"] {
  display: block;
  width: 100%;
  margin-top: 0.6rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.itd-tuning output {
  display: block;
  margin-top: 0.4rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-weight: 700;
  font-size: 1.15rem;
}

/* Strong, obvious focus indicator for keyboard users. */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

canvas {
  display: block;
  width: 600px;
  max-width: 100%;
  height: auto;
  background: var(--bg);
  border: 3px solid var(--border);
  border-radius: 4px;
}

/* Live value readout: large, high-contrast, monospace numbers. */
.values {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
}

.values > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--border);
}

.values dt {
  font-weight: 600;
}

.values dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-weight: 700;
  font-size: 1.15rem;
}

.help ul {
  margin: 0;
  padding-left: 1.2rem;
}

.help li {
  margin: 0.35rem 0;
}

kbd {
  font-family: ui-monospace, Consolas, monospace;
  background: var(--kbd-bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.05rem 0.4rem;
  font-size: 0.9em;
}

/* Visually hidden but available to assistive tech (for the live region). */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}