/* edu-display — styles */

:root {
  --bg: #1a1a2e;
  --text: #e0e0e0;
  --accent: #0f3460;
  --badge-bg: #16213e;
  --badge-text: #7a8caa;
  --progress-bg: #16213e;
  --progress-fill: #0f3460;
  --reveal-text: #a0a0c0;
  --example-text: #6a7a9a;
  --settings-bg: #16213e;
  --settings-border: #0f3460;
  --settings-text: #e0e0e0;
  --settings-accent: #4a9eff;
}

[data-theme="light"] {
  --bg: #f5f5f5;
  --text: #1a1a2e;
  --accent: #0f3460;
  --badge-bg: #e0e0e0;
  --badge-text: #5a6a8a;
  --progress-bg: #e0e0e0;
  --progress-fill: #0f3460;
  --reveal-text: #3a3a5e;
  --example-text: #6a6a8a;
  --settings-bg: #ffffff;
  --settings-border: #c0c0d0;
  --settings-text: #1a1a2e;
  --settings-accent: #0f3460;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ── Card ─────────────────────────────────────────── */

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 2rem;
  text-align: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card.visible { opacity: 1; }

.card-badge {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  font-size: clamp(0.8rem, 2vw, 1.2rem);
  background: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.3rem 0.8rem;
  border-radius: 1rem;
  opacity: 0.7;
}

.card-primary {
  font-size: clamp(2rem, 8vw, 6rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  word-break: break-word;
}

.card-primary.math {
  font-family: Cambria, 'Times New Roman', serif;
  font-weight: 500;
}

.card-reveal {
  font-size: clamp(1.5rem, 5vw, 4rem);
  color: var(--reveal-text);
  opacity: 0;
  transition: opacity 0.3s ease;
  margin-bottom: 0.5rem;
}

.card-reveal.visible { opacity: 1; }

.card-example {
  font-size: clamp(1rem, 3vw, 2rem);
  color: var(--example-text);
  opacity: 0;
  transition: opacity 0.3s ease;
  max-width: 80%;
  line-height: 1.4;
}

.card-example.visible { opacity: 1; }

/* ── Progress bar ─────────────────────────────────── */

.progress-track {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--progress-bg);
  z-index: 10;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--progress-fill);
  transition: none;
}

/* ── Settings ─────────────────────────────────────── */

.settings-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: none;
  font-size: 1.5rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 20;
}

.settings-toggle.visible { opacity: 0.6; }
.settings-toggle:hover { opacity: 1; }

.settings-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--settings-bg);
  border: 1px solid var(--settings-border);
  border-radius: 1rem;
  padding: 2rem;
  color: var(--settings-text);
  min-width: 320px;
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 30;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.settings-panel.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.settings-panel h2 {
  font-size: 1.4rem;
  margin-bottom: 1.2rem;
}

.settings-panel fieldset {
  border: none;
  margin-bottom: 1.2rem;
}

.settings-panel legend {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--settings-accent);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.settings-panel label {
  display: block;
  font-size: 1.1rem;
  padding: 0.3rem 0;
  cursor: pointer;
}

.settings-panel input[type="checkbox"],
.settings-panel input[type="radio"] {
  width: 1.2rem;
  height: 1.2rem;
  margin-right: 0.5rem;
  accent-color: var(--settings-accent);
}

.settings-panel input[type="range"] {
  width: 100%;
  accent-color: var(--settings-accent);
}

.settings-panel select {
  width: 100%;
  padding: 0.5rem;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--settings-border);
  border-radius: 0.5rem;
}

.settings-close {
  width: 100%;
  padding: 0.8rem;
  font-size: 1.1rem;
  background: var(--settings-accent);
  color: #fff;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  margin-top: 0.5rem;
}

.settings-close:hover { opacity: 0.9; }

/* ── Idle cursor hide ─────────────────────────────── */

body.idle { cursor: none; }