/* ══════════════════════════════════════════════
   SHARED — Sonographer Trial Cards
   ══════════════════════════════════════════════ */

/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700;9..144,800&display=swap');

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/* ── Background ── */
body {
  background-color: #e8eaf0;
  background-image: url("background.png");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
}

/* ── Pill Tabs (centered) ── */
.tabs {
  display: flex;
  justify-content: center;
  gap: 6px;
  background: var(--card, #fff);
  padding: 6px;
  border-radius: 100px;
  border: 1px solid var(--border, #E8E8EE);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  transition: all 0.3s ease;
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 8px 16px;
  border-radius: 100px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text2, #5A5A72);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover { color: var(--text, #1E1E2A); }

.tab-btn.active {
  background: var(--card, #fff);
  color: var(--accent, #6366F1);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border: 1.5px solid var(--accent, #6366F1);
}

.tab-btn.unlocked { color: var(--text2, #5A5A72); }
.tab-btn.locked { opacity: .35; cursor: not-allowed; }

/* ── Flat Tabs (card-style underline) ── */
.tabs--flat {
  gap: 0;
  padding: 0;
  border-radius: 16px 16px 0 0;
  border: none;
  border-bottom: 1px solid var(--border, #E8E8EE);
  box-shadow: none;
  overflow: hidden;
}

.tabs--flat .tab-btn {
  flex: 1;
  padding: .7rem .5rem;
  border-radius: 0;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  position: relative;
}

.tabs--flat .tab-btn.active {
  color: var(--accent, #6366F1);
  background: var(--card, #fff);
  box-shadow: none;
  border: none;
}

.tabs--flat .tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2.5px;
  background: var(--accent, #6366F1);
}

/* ── Flat Tab Body ── */
.tab-body {
  background: var(--card, #fff);
  border-radius: 0 0 16px 16px;
  border: 1px solid var(--border, #E8E8EE);
  border-top: none;
  padding: 2rem;
  min-height: 240px;
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}

/* ── Flat Panes ── */
.pane { display: none; }
.pane.active { display: block; animation: paneFadeIn .35s ease; }
@keyframes paneFadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ══════════════════════════════════════════════
   PANEL TRANSITIONS
   ══════════════════════════════════════════════ */
.panel {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  display: flex;
  flex-direction: column;
}
.panel.active {
  opacity: 1;
  pointer-events: auto;
}

/* ══════════════════════════════════════════════
   STEPPED QUIZ
   ══════════════════════════════════════════════ */

/* ── Progress dots ── */
.quiz-progress { display: flex; gap: 6px; justify-content: center; margin-bottom: 1rem; }
.quiz-dot {
  height: 8px; width: 8px; border-radius: 4px;
  background: var(--border, #E8E8EE);
  transition: all .3s ease;
}
.quiz-dot.active { width: 24px; background: var(--accent, #6366F1); }
.quiz-dot.completed { background: #10B981; }

/* ── Step visibility ── */
.quiz-step-hidden { display: none; }
.quiz-step-active { display: block; animation: quizSlideUp .4s ease-out; }
@keyframes quizSlideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Question block ── */
.quiz-q {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  margin-bottom: 1.5rem;
}
.quiz-q-label {
  display: block;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent, #6366F1);
  margin-bottom: .5rem;
}
.quiz-q-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text, #1E1E2A);
  line-height: 1.3;
  margin-bottom: 1.5rem;
}
.quiz-hint {
  font-size: .8rem;
  color: var(--text3, #8A8AA0);
  font-style: italic;
  margin-bottom: .5rem;
}

/* ── Option buttons ── */
.quiz-opt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  background: var(--card, #fff);
  border: 2px solid #f1f5f9;
  border-radius: 20px;
  padding: 1.25rem 1.5rem;
  margin-bottom: .75rem;
  font-family: 'DM Sans', sans-serif;
  font-size: .95rem;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  transition: all .2s ease;
}
.quiz-opt:hover:not(:disabled) {
  border-color: var(--accent, #818cf8);
  background: #f8faff;
  color: var(--accent, #4f46e5);
  transform: translateX(6px);
}
.quiz-opt.correct { background: #ECFDF5; border-color: #34D399; color: #065F46; }
.quiz-opt.wrong { background: #FFF1F2; border-color: #FDA4AF; color: #9F1239; animation: quizShake .4s ease-in-out; }
.quiz-opt:disabled { cursor: default; }
@keyframes quizShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* ── Concept recall ── */
.quiz-recall {
  margin-top: 1rem;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height .4s ease, opacity .3s;
}
.quiz-recall.visible {
  max-height: 300px;
  opacity: 1;
}
.quiz-recall-inner {
  background: var(--accent-light, #EEF0FE);
  border: 1px solid var(--accent-border, #B4B6F0);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
}
.quiz-recall-label {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--accent, #6366F1);
  margin-bottom: .4rem;
}
.quiz-recall-text {
  font-size: .9rem;
  color: var(--text2, #5A5A72);
  line-height: 1.6;
  margin-bottom: 1rem;
}
.quiz-recall-btn {
  display: block;
  width: 100%;
  padding: .75rem;
  background: var(--accent, #6366F1);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-family: 'DM Sans', sans-serif;
  font-size: .9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}
.quiz-recall-btn:hover { filter: brightness(1.1); }

/* ── Final step ── */
.quiz-final { text-align: center; padding: 1rem 0; }
.quiz-final-icon {
  width: 80px; height: 80px;
  background: #D1FAE5;
  color: #059669;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.5rem;
}
.quiz-final-icon svg { width: 40px; height: 40px; }
.quiz-final h3 { font-size: 1.75rem; font-weight: 800; margin-bottom: .5rem; }
.quiz-final p { color: var(--text3, #8A8AA0); font-size: .95rem; font-weight: 500; margin-bottom: 2.5rem; }

/* ── Self-sort ── */
.quiz-self-sort {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.quiz-sort-btn {
  width: 100%;
  padding: 1rem 1.5rem;
  border-radius: 16px;
  border: none;
  font-family: 'DM Sans', sans-serif;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  text-align: center;
}
.quiz-sort-btn.got-it {
  background: #10B981;
  color: #fff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}
.quiz-sort-btn.got-it:hover { background: #059669; }
.quiz-sort-btn.review {
  background: #f1f5f9;
  color: #475569;
}
.quiz-sort-btn.review:hover { background: #e2e8f0; }
.quiz-sort-btn.selected { font-weight: 700; transform: scale(0.97); }
.quiz-sort-btn.got-it.selected { background: #059669; }
.quiz-sort-btn.review.selected { background: #e2e8f0; }
.quiz-sort-icon { width: 16px; height: 16px; vertical-align: middle; margin-right: 6px; }

/* ── Toast ── */
.quiz-toast {
  position: fixed;
  top: 1.2rem;
  left: 50%;
  transform: translate(-50%, -1rem);
  background: #1E1E2A;
  color: #fff;
  padding: .75rem 2rem;
  border-radius: 16px;
  font-family: 'DM Sans', sans-serif;
  font-size: .9rem;
  font-weight: 700;
  box-shadow: 0 8px 30px rgba(0,0,0,.25);
  opacity: 0;
  pointer-events: none;
  transition: all .3s ease;
  z-index: 200;
}
.quiz-toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ══════════════════════════════════════════════
   NEXT BUTTON
   ══════════════════════════════════════════════ */
.btn-next {
  display: inline-block;
  background: var(--accent, #6366F1);
  color: #fff;
  border: none;
  border-radius: 99px;
  padding: .55rem 1.4rem;
  font-family: 'DM Sans', sans-serif;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  margin-top: 1rem;
}
.btn-next:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* ══════════════════════════════════════════════
   FLIP CARDS
   ══════════════════════════════════════════════ */
.flip-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; margin: 1rem 0; }
.flip-card { perspective: 1000px; cursor: pointer; min-height: 200px; }
.flip-card-inner {
  position: relative; width: 100%; height: 100%; min-height: inherit;
  transition: transform .5s; transform-style: preserve-3d;
}
.flip-card.flipped .flip-card-inner { transform: rotateY(180deg); }
.flip-card-front, .flip-card-back {
  position: absolute; inset: 0; backface-visibility: hidden;
  border-radius: 12px; padding: 1rem;
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
}
.flip-card-front { background: var(--accent-light, #EEF0FE); border: 1.5px solid var(--accent-border, #B4B6F0); }
.flip-card-back { background: var(--card, #fff); border: 1.5px solid var(--border, #E8E8EE); transform: rotateY(180deg); }
.flip-card-front .flip-term { font-family: 'Fraunces', serif; font-size: 1rem; font-weight: 700; color: var(--accent, #6366F1); }
.flip-card-front .flip-hint { font-size: .68rem; color: var(--text3, #8A8AA0); margin-top: .3rem; }
.flip-card-back .flip-term { font-family: 'Fraunces', serif; font-size: .95rem; font-weight: 700; color: var(--accent, #6366F1); margin-bottom: .4rem; }
.flip-card-back .flip-def { font-size: .82rem; color: var(--text2, #5A5A72); line-height: 1.5; text-align: center; }
.flip-card-back .flip-example { font-size: .8rem; color: var(--text3, #8A8AA0); margin-top: .5rem; font-style: italic; line-height: 1.5; }
@media (max-width: 600px) {
  .flip-grid { grid-template-columns: 1fr; }
  .flip-card { min-height: 160px; }
}

/* ══════════════════════════════════════════════
   EXPOUNDER OVERRIDES
   ══════════════════════════════════════════════ */
[data-expounder-c] {
  text-decoration: none; color: var(--term-color, var(--accent)); font-weight: 700; cursor: pointer;
  background: color-mix(in srgb, var(--term-color, var(--accent)) 10%, transparent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--term-color, var(--accent)) 10%, transparent);
  border-radius: 3px; border-bottom: none;
  transition: background .2s ease, box-shadow .2s ease;
}
[data-expounder-c]:hover {
  background: color-mix(in srgb, var(--term-color, var(--accent)) 18%, transparent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--term-color, var(--accent)) 18%, transparent);
}
[data-expounded] { display: none; color: var(--text2, #5A5A72); font-style: italic; }
[data-expounded].expounded-appear { display: initial; animation: expoundedFadeIn .5s; }
[data-expounded].expounded-disappear { display: initial; animation: expoundedFadeOut .5s; }
@keyframes expoundedFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes expoundedFadeOut { from { opacity: 1; } to { opacity: 0; } }

/* ══════════════════════════════════════════════
   MICRO-ANIMATIONS
   ══════════════════════════════════════════════ */
@keyframes popOnce {
  0% { transform: translateY(0); } 20% { transform: translateY(-4px); }
  40% { transform: translateY(1px); } 60% { transform: translateY(-2px); }
  80%, 100% { transform: translateY(0); }
}
.pop-once { display: inline-block; animation: popOnce .6s ease .3s 1 both; }

@keyframes bounceOnce {
  0% { transform: scale(1); } 30% { transform: scale(1.03); }
  60% { transform: scale(.98); } 100% { transform: scale(1); }
}
.bounce-once { animation: bounceOnce .5s ease .2s 1 both; }

/* ══════════════════════════════════════════════
   CONTENT BOXES
   ══════════════════════════════════════════════ */
.takeaway {
  background: var(--accent-light, #EEF0FE);
  border: 1.5px solid var(--accent-border, #B4B6F0);
  border-radius: 12px; padding: 1rem 1.2rem; margin: .8rem 0;
  font-size: .92rem; color: var(--text, #1E1E2A); line-height: 1.7;
}
.transition-text {
  font-size: .88rem; color: var(--text2, #5A5A72); line-height: 1.6;
  margin: .8rem 0; padding: .8rem 1rem;
  background: var(--accent-light, #EEF0FE);
  border-left: 3px solid var(--accent, #6366F1);
  border-radius: 0 8px 8px 0;
}

/* ══════════════════════════════════════════════
   TERM COLOR REGISTRY
   ══════════════════════════════════════════════ */
:root {
  --term-frequency: #30a3c6;
  --term-period: #46a87e;
  --term-amplitude: #c8b827;
  --term-wavelength: #fd945f;
  --term-compression: #E85D5D;
  --term-rarefaction: #7C3AED;
  --term-direct: #D97720;
  --term-inverse: #6C5CE7;
  --term-intensity: #E85D5D;
  --term-proportional: #6366F1;
  --term-reciprocal: #8B5CF6;
}

/* ══════════════════════════════════════════════
   DIRECTIONAL COLORING
   ══════════════════════════════════════════════ */
.dir-up { color: var(--up, #E85D5D); font-weight: 700; }
.dir-down { color: var(--down, #5B7FC7); font-weight: 700; }

/* ══════════════════════════════════════════════
   SPI REGISTRY BADGE
   ══════════════════════════════════════════════ */
.spi-badge {
  display: inline-flex; align-items: center; gap: 4px;
  background: #FEF3C7; border: 1px solid #FCD34D;
  border-radius: 100px; padding: 2px 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: .7rem; font-weight: 700; color: #92400E;
  letter-spacing: .03em; white-space: nowrap;
}
.spi-badge::before { content: '\2605'; font-size: .6rem; }