/* ============================================================
   Codec Trust Study — Custom Styles
   ============================================================ */

/* ── Variables ── */
:root {
  --accent:      #4f6ef7;
  --accent-dark: #3755d4;
  --accent-rgb:  79, 110, 247;
}

/* ── Global ── */
body {
  background: #f4f6fb;
  color: #1a1a2e;
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-size: 1rem;
  line-height: 1.6;
}

main { flex: 1; }

/* ── Navbar ── */
.bg-dark-custom { background: #12122a !important; }

/* ── Accent colour helpers ── */
.text-accent   { color: var(--accent) !important; }
.bg-accent     { background-color: var(--accent) !important; }
.border-accent { border-color: var(--accent) !important; }

.btn-accent {
  background-color: var(--accent);
  border-color:     var(--accent);
  color: #fff;
  font-weight: 600;
  transition: background 0.18s, transform 0.1s;
}
.btn-accent:hover    { background-color: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-accent:active   { transform: scale(0.98); }
.btn-accent:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Progress bar ── */
.progress-outer { background: #fff; border-bottom: 1px solid #e8e8f0; }

/* ── Step badges ── */
.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  margin-right: 0.4rem;
  flex-shrink: 0;
}

/* ── Condition header ── */
.condition-header { background: #fff; }
.condition-header .badge { font-size: 0.9rem; }

/* ── Sample tiles ── */
.sample-tile {
  background: #fafbff;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.sample-tile:hover  { background: #eef1ff; border-color: var(--accent) !important; cursor: pointer; }
.sample-tile.selected {
  background: #e8edff;
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 2px rgba(var(--accent-rgb), 0.25);
}

/* ── Audio players ── */
audio { border-radius: 8px; height: 42px; }

.audio-label-box { border: 1px solid #e0e4f0; }
.original-box  { background: #f5f7ff; }
.processed-box { background: #f0fff4; border-color: #c3e6cb; }
.residual-box  { background: #fffbf0; border-color: #ffeeba; }

/* ── Explanation boxes ── */
.explanation-box {
  background: #f8f9ff;
  border: 1px solid #dde2f5;
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 0.88rem;
  line-height: 1.65;
  color: #333;
}
.explanation-box p { margin-bottom: 6px; }
.explanation-box ul { margin-bottom: 4px; padding-left: 1.2rem; }
.explanation-box li { margin-bottom: 3px; }

/* Inline colour badges used inside explanation text */
.badge-inline {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 600;
}
.badge-inline.orig  { background: #ddeeff; color: #1155aa; }
.badge-inline.proc  { background: #dff5df; color: #116611; }
.badge-inline.resid { background: #fff3cd; color: #856404; }

/* ── Visualisation blocks ── */
.viz-block { }
.viz-header h6 { color: #1a1a2e; }

/* Card with edge-to-edge image (no padding around viz-thumb-wrap) */
.viz-card { overflow: hidden; }

.viz-thumb-wrap {
  position: relative;
  cursor: zoom-in;
  /* No border-radius here — inherited from .viz-card overflow:hidden */
  overflow: hidden;
  background: linear-gradient(135deg, #eef0fb 0%, #e4e8f5 100%);
  /* Always occupies visible space even before image loads */
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.viz-thumb {
  display: block;
  width: 100%;
  height: auto;
  transition: opacity 0.15s;
  /* Remove rounded/border classes — card handles the corners */
  border-radius: 0 !important;
  border: none !important;
}
.viz-thumb-wrap:hover .viz-thumb { opacity: 0.88; }

.viz-expand-hint {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(15, 15, 35, 0.72);
  color: #fff;
  font-size: 0.78rem;
  text-align: center;
  padding: 6px;
  opacity: 0;
  transition: opacity 0.18s;
}
.viz-thumb-wrap:hover .viz-expand-hint { opacity: 1; }

/* ── Lightbox ── */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 8, 20, 0.94);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  cursor: zoom-out;
  animation: lb-in 0.18s ease;
}
@keyframes lb-in { from { opacity: 0; } to { opacity: 1; } }

.lightbox-img {
  max-width: 92vw;
  max-height: 76vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  cursor: default;
}
.lightbox-caption {
  color: #e0e4ff;
  text-align: center;
  margin-top: 16px;
  max-width: 720px;
  font-size: 0.88rem;
  line-height: 1.6;
  cursor: default;
}
.lightbox-close {
  position: absolute;
  top: 14px;
  right: 20px;
  color: #fff;
  font-size: 2.2rem;
  line-height: 1;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  opacity: 0.8;
  transition: opacity 0.15s;
}
.lightbox-close:hover { opacity: 1; }

/* ── Metrics ── */
.metric-card {
  background: #fff;
  border: 1px solid #e2e6ff;
  border-radius: 10px;
  padding: 14px 10px 10px;
  cursor: default;
  transition: box-shadow 0.15s;
}
.metric-card:hover { box-shadow: 0 2px 10px rgba(var(--accent-rgb),0.15); }
.metric-value { font-size: 1.35rem; font-weight: 700; color: var(--accent); }
.metric-label { font-size: 0.7rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; }
.metric-explain { font-size: 0.68rem; color: #aaa; margin-top: 3px; line-height: 1.3; }
.metric-quality {
  display: inline-block;
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 3px;
  margin-top: 4px;
  font-weight: 600;
}
.mq-excellent { background: #d4edda; color: #155724; }
.mq-good      { background: #d1ecf1; color: #0c5460; }
.mq-fair      { background: #fff3cd; color: #856404; }
.mq-poor      { background: #f8d7da; color: #721c24; }

/* ── Likert scale ── */
.trust-item { background: #fafbff; transition: background 0.15s; }
.trust-item.answered { background: #f0f3ff; border-color: #c5d0ff !important; }

.likert-scale { gap: 4px; }
.likert-label { min-width: 52px; font-size: 0.7rem; line-height: 1.2; }

.likert-option { cursor: pointer; }
.likert-btn {
  display: block;
  padding: 8px 4px;
  border-radius: 6px;
  border: 2px solid #d0d4e8;
  background: #fff;
  font-size: 0.88rem;
  font-weight: 600;
  color: #555;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.likert-option:hover .likert-btn { background: #eef0ff; border-color: var(--accent); }
.likert-option input:checked + .likert-btn {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

/* ── MOS scale ── */
.mos-option { cursor: pointer; min-width: 80px; }
.mos-btn {
  display: block;
  padding: 10px 8px 8px;
  border-radius: 8px;
  border: 2px solid #d0d4e8;
  background: #fff;
  text-align: center;
  transition: background 0.12s, border-color 0.12s;
}
.mos-num  { display: block; font-size: 1.3rem; color: #333; font-weight: 700; }
.mos-lbl  { display: block; font-size: 0.75rem; color: #555; font-weight: 600; }
.mos-desc { display: block; font-size: 0.62rem; color: #888; line-height: 1.3; margin-top: 2px; }
.mos-option:hover .mos-btn { background: #eef0ff; border-color: var(--accent); }
.mos-option input:checked + .mos-btn { background: var(--accent); border-color: var(--accent); }
.mos-option input:checked + .mos-btn .mos-num,
.mos-option input:checked + .mos-btn .mos-lbl,
.mos-option input:checked + .mos-btn .mos-desc { color: #fff; }

/* ── Spinner ── */
.spinner-border.text-accent { color: var(--accent) !important; }

/* ── Upload zone ── */
#upload-zone { background: #fafbff; transition: background 0.15s; }
#upload-zone:focus-within { background: #f0f3ff; border-color: var(--accent) !important; }

/* ── Completion page ── */
.success-circle {
  width: 80px; height: 80px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #6c8ef8);
  display: flex; align-items: center; justify-content: center;
  font-size: 2.2rem; color: #fff;
}
.completion-code {
  font-family: 'Courier New', monospace;
  font-size: 1.4rem; font-weight: 700; letter-spacing: 2px;
  color: var(--accent); padding: 8px 16px;
  background: #f0f3ff; border-radius: 8px;
  display: inline-block; margin-top: 4px;
}

/* ── Cursor ── */
.cursor-pointer { cursor: pointer; }

/* ── Quality verdict circle ── */
.verdict-circle {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
  border: 4px solid transparent;
  transition: background 0.2s, border-color 0.2s;
}
.verdict-label { display: block; text-align: center; line-height: 1.1; }
.verdict-excellent { background: #d4edda; border-color: #28a745; color: #155724; }
.verdict-good      { background: #d1ecf1; border-color: #17a2b8; color: #0c5460; }
.verdict-moderate  { background: #fff3cd; border-color: #ffc107; color: #856404; }
.verdict-limited   { background: #f8d7da; border-color: #dc3545; color: #721c24; }

/* Verdict supporting detail rows */
.verdict-detail-row {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-size: 0.85rem;
  padding: 4px 0;
  border-bottom: 1px solid #f0f0f5;
}
.verdict-detail-row:last-child { border-bottom: none; }
.verdict-detail-label {
  flex-shrink: 0;
  width: 130px;
  font-weight: 600;
  color: #555;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ── Beta absence panel ── */
.absence-item {
  background: #f5f5f8;
  border: 1px solid #e0e0ea;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.8rem;
  color: #888;
  text-align: center;
}

/* ── System Alpha / Beta comparison columns ── */
.system-compare-col {
  transition: background 0.2s, border-color 0.2s, opacity 0.2s;
  background: #fafbff;
}
.system-compare-active {
  background: #eef1ff !important;
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 2px rgba(var(--accent-rgb), 0.2);
}
.system-compare-inactive { opacity: 0.4; }

/* ── How it works (welcome page flow) ── */
.how-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
}
.how-step + .how-step { border-top: 1px solid #eaecf5; }
.how-step-num {
  flex-shrink: 0;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.how-step-body { flex: 1; padding-top: 2px; }
.how-step-body strong { display: block; font-weight: 600; margin-bottom: 2px; }
.how-step-body span { font-size: 0.875rem; color: #555; }

/* ── Session reminder bar ── */
.session-reminder {
  background: #fffbe6;
  border: 1px solid #ffe58f;
  border-radius: 8px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
}
.session-reminder .reminder-item {
  display: flex;
  align-items: center;
  gap: 5px;
  color: #665000;
}
.session-reminder .reminder-divider {
  color: #ccc;
  font-size: 1rem;
}

/* ── Trust progress counter ── */
.trust-counter {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #666;
  background: #f0f3ff;
  border-radius: 20px;
  padding: 3px 10px;
  transition: background 0.2s, color 0.2s;
}
.trust-counter.complete {
  background: #d4edda;
  color: #155724;
}
.trust-counter .counter-bar {
  height: 4px;
  width: 60px;
  background: #dde0f0;
  border-radius: 2px;
  overflow: hidden;
}
.trust-counter .counter-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s;
}

/* ── Inline validation error ── */
.validation-alert {
  background: #fff3cd;
  border: 1px solid #ffecb5;
  border-left: 4px solid #ffc107;
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 0.875rem;
  color: #664d03;
  margin-top: 8px;
  display: none;
}
.validation-alert.show { display: block; }

/* ── Glossary ── */
.glossary-toggle {
  font-size: 0.8rem;
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline dotted;
  background: none;
  border: none;
  padding: 0;
}
.glossary-box {
  background: #fafbff;
  border: 1px solid #dde2f5;
  border-radius: 8px;
  padding: 14px 16px;
  margin-top: 10px;
}
.glossary-box dt {
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--accent);
  margin-top: 8px;
}
.glossary-box dd {
  font-size: 0.82rem;
  color: #555;
  margin-left: 0;
  margin-bottom: 0;
}
.glossary-box dt:first-child { margin-top: 0; }

/* ── Responsive ── */
@media (max-width: 576px) {
  .likert-label { display: none; }
  .mos-option   { min-width: 55px; }
  .mos-desc     { display: none; }
  .lightbox-img { max-width: 98vw; max-height: 60vh; }

  /* Minimum readable font sizes on mobile */
  .metric-explain { font-size: 0.72rem; }
  .metric-label   { font-size: 0.7rem; }
  .explanation-box { font-size: 0.85rem; }
  .session-reminder { font-size: 0.8rem; }
  .reminder-divider { display: none; }
}