/* ═══════════════════════════════════════════
   Experiment 5 — Custom UI (no jsPsych)
   ═══════════════════════════════════════════ */

:root {
  --c-bg: #fafbfd;
  --c-text: #1a1a2e;
  --c-accent: #4361ee;
  --c-accent-hover: #3a56d4;
  --c-regular: #e63946;
  --c-random: #2a9d8f;
  --c-border: #e0e4ec;
  --c-card: #ffffff;
  --c-muted: #888;
  --font: 'Noto Sans SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Consolas', monospace;
}

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  min-height: 100vh;
}

#app {
  max-width: 880px;
  margin: 0 auto;
  padding: 20px 24px;
  min-height: 100vh;
}

/* ──── Pages (consent, instructions, etc.) ──── */

.page {
  max-width: 680px;
  margin: 40px auto;
  padding: 40px 32px;
  background: var(--c-card);
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.page h2 {
  text-align: center;
  font-size: 24px;
  margin-bottom: 24px;
  color: var(--c-text);
}

.page p {
  margin-bottom: 14px;
  text-align: justify;
}

.page ul { padding-left: 24px; margin-bottom: 14px; }
.page li { margin-bottom: 6px; }

.info-box {
  background: #f0f4ff;
  border-left: 4px solid var(--c-accent);
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  margin: 18px 0;
}

/* ──── Buttons ──── */

.btn {
  display: inline-block;
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  padding: 12px 36px;
  background: var(--c-accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn:hover { background: var(--c-accent-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(67,97,238,0.3); }
.btn:disabled { background: #ccc; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-center { display: block; margin: 24px auto 0; }

.btn-sm {
  font-size: 13px;
  padding: 4px 14px;
  border-radius: 6px;
  background: #eef1f8;
  color: var(--c-accent);
  border: 1px solid var(--c-border);
}
.btn-sm:hover { background: #dce3f5; transform: none; box-shadow: none; }

/* ──── Progress bar ──── */

.progress-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-card);
  padding: 10px 0 8px;
  border-bottom: 1px solid var(--c-border);
  margin: -20px -24px 0;
  padding-left: 24px;
  padding-right: 24px;
}

.progress-track {
  height: 6px;
  background: #e8e8e8;
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(to right, var(--c-accent), var(--c-random));
  border-radius: 3px;
  transition: width 0.3s;
}

.progress-text {
  font-size: 13px;
  color: var(--c-muted);
  margin-top: 4px;
  text-align: right;
}

/* ──── Rating interface ──── */

.rating-panel {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}

.rating-main {
  flex: 1;
  min-width: 0;
}

.sequence-card {
  background: var(--c-card);
  border: 2px solid var(--c-border);
  border-radius: 16px;
  padding: 32px 24px 28px;
  text-align: center;
  margin-bottom: 16px;
}

.sequence-digits {
  font-family: var(--mono);
  font-size: 56px;
  font-weight: 700;
  letter-spacing: 10px;
  color: var(--c-text);
  user-select: none;
  margin-bottom: 4px;
}

.sequence-meta {
  font-size: 13px;
  color: var(--c-muted);
}

/* ──── Stepped slider ──── */

.slider-area {
  background: var(--c-card);
  border: 2px solid var(--c-border);
  border-radius: 16px;
  padding: 24px 28px 20px;
  margin-bottom: 16px;
}

.slider-value-display {
  text-align: center;
  margin-bottom: 16px;
}

.slider-value-num {
  font-size: 48px;
  font-weight: 700;
  font-family: var(--mono);
  color: var(--c-accent);
  line-height: 1;
  text-align: center;
  width: 120px;
  margin: 0 auto;
  border: none;
  border-bottom: 2px dashed transparent;
  background: transparent;
  outline: none;
  -moz-appearance: textfield;
  appearance: textfield;
  display: block;
}

.slider-value-num:focus {
  border-bottom-color: var(--c-accent);
}

.slider-value-num::-webkit-inner-spin-button,
.slider-value-num::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.slider-value-label {
  font-size: 14px;
  color: var(--c-muted);
  margin-top: 4px;
}

.slider-wrapper {
  position: relative;
  padding: 0 6px;
}

/* Tick marks */
.tick-marks {
  display: flex;
  justify-content: space-between;
  padding: 0 6px;
  margin-bottom: 2px;
}

.tick-marks span {
  font-size: 11px;
  color: #aaa;
  width: 1px;
  text-align: center;
  position: relative;
}

.tick-marks span::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 1px;
  height: 8px;
  background: #ccc;
}

.tick-marks span.tick-major { font-weight: 600; color: #666; font-size: 12px; }
.tick-marks span.tick-major::after { height: 12px; background: #999; }

/* Range input */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 10px;
  border-radius: 5px;
  background: linear-gradient(to right, var(--c-regular), #f4a261, #e9c46a, var(--c-random));
  outline: none;
  margin: 8px 0;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c-accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  transition: box-shadow 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 3px 14px rgba(67,97,238,0.4);
}

input[type="range"]::-moz-range-thumb {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--c-accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

/* Hidden thumb until first interaction — prevents anchoring at 50 */
input[type="range"].thumb-hidden::-webkit-slider-thumb {
  opacity: 0.15;
  transform: scale(0.5);
}
input[type="range"].thumb-hidden::-moz-range-thumb {
  opacity: 0.15;
  transform: scale(0.5);
}

.slider-endpoints {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  padding: 0 2px;
}

.slider-endpoints span {
  font-size: 14px;
  font-weight: 600;
}
.slider-endpoints span:first-child { color: var(--c-regular); }
.slider-endpoints span:last-child { color: var(--c-random); }

.confirm-btn-area {
  text-align: center;
  margin-top: 8px;
}

/* ──── History panel ──── */

.history-panel {
  width: 280px;
  flex-shrink: 0;
}

.history-card {
  background: var(--c-card);
  border: 2px solid var(--c-border);
  border-radius: 16px;
  overflow: hidden;
  position: sticky;
  top: 60px;
  max-height: calc(100vh - 90px);
  display: flex;
  flex-direction: column;
}

.history-header {
  padding: 12px 16px;
  font-weight: 700;
  font-size: 14px;
  border-bottom: 1px solid var(--c-border);
  background: #f8f9fc;
  flex-shrink: 0;
}

.history-list {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.history-item {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid #f0f2f5;
  font-size: 13px;
  gap: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.history-item:hover { background: #f5f7ff; }
.history-item.editing { background: #edf0ff; border-left: 3px solid var(--c-accent); }

.history-seq {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  flex-shrink: 0;
}

.history-score {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--c-accent);
  min-width: 28px;
  text-align: right;
}

.history-edit-btn {
  font-size: 12px;
  color: var(--c-accent);
  cursor: pointer;
  margin-left: auto;
  flex-shrink: 0;
  padding: 2px 8px;
  border-radius: 4px;
  background: #eef1f8;
  border: none;
  font-family: inherit;
}
.history-edit-btn:hover { background: #dce3f5; }

.history-empty {
  padding: 24px 16px;
  text-align: center;
  color: var(--c-muted);
  font-size: 13px;
}

/* ──── Calibration ──── */

.calibration-grid {
  display: grid;
  gap: 10px;
  margin: 20px 0;
}

.calibration-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: #f8f9fc;
  border-radius: 10px;
  border: 1px solid var(--c-border);
}

.calibration-seq {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  flex-shrink: 0;
}

.calibration-bar {
  flex: 1;
  height: 8px;
  background: #e8e8e8;
  border-radius: 4px;
  position: relative;
}

.calibration-dot {
  position: absolute;
  top: -4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  transform: translateX(-50%);
}

.calibration-label {
  font-size: 13px;
  color: var(--c-muted);
  min-width: 60px;
  text-align: right;
}

/* ──── Demographics ──── */

.demo-form label {
  display: block;
  margin: 14px 0 4px;
  font-weight: 600;
  font-size: 15px;
}

.demo-form select,
.demo-form input[type="number"],
.demo-form input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--c-border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s;
  background: #fff;
}

.demo-form select:focus,
.demo-form input:focus { border-color: var(--c-accent); outline: none; }

/* ──── End screen ──── */

.end-screen { text-align: center; padding: 40px 20px; }

.end-screen h2 { font-size: 28px; color: var(--c-random); margin-bottom: 16px; }

.completion-code {
  font-size: 26px;
  font-weight: 700;
  font-family: var(--mono);
  background: #f0f4ff;
  padding: 14px 28px;
  border-radius: 12px;
  display: inline-block;
  margin: 16px 0;
  color: var(--c-accent);
  letter-spacing: 4px;
}

/* ──── Responsive ──── */

@media (max-width: 768px) {
  .rating-panel { flex-direction: column; }
  .history-panel { width: 100%; }
  .history-card { position: static; max-height: 300px; }
  .sequence-digits { font-size: 36px; letter-spacing: 6px; }
  .slider-value-num { font-size: 36px; }
}