body { font-family: 'Inter', sans-serif; }
.quiz-card, .part-selection-card, .review-card { box-shadow: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05); }
.option-btn, .part-btn, .part3-option-btn { transition: all .2s ease-in-out; }
.option-btn:not(:disabled):hover, .part-btn:not(:disabled):hover, .part3-option-btn:not(:disabled):hover { transform: scale(1.02); border-color:#3b82f6; }
.part-btn:disabled { background-color:#e5e7eb; cursor:not-allowed; opacity:.6; }
.correct { background-color:#22c55e !important; color:#fff !important; border-color:#16a34a !important; }
.incorrect { background-color:#ef4444 !important; color:#fff !important; border-color:#dc2626 !important; }
.review-correct { border-color:#22c55e; background-color:#f0fdf4; }
.review-incorrect { border-color:#ef4444; background-color:#fef2f2; }
.explanation { border-left:4px solid #60a5fa; }
.key-hint { background:#f3f4f6; border:1px solid #d1d5db; border-radius:.25rem; padding:.125rem .5rem; font-weight:600; margin-right:.75rem; box-shadow:0 1px 1px rgba(0,0,0,.1); color:#374151; }
@keyframes shake{10%,90%{transform:translate3d(-1px,0,0)}20%,80%{transform:translate3d(2px,0,0)}30%,50%,70%{transform:translate3d(-4px,0,0)}40%,60%{transform:translate3d(4px,0,0)}}
.shake{animation:shake .82s cubic-bezier(.36,.07,.19,.97) both}
@keyframes pulse{0%{transform:scale(1);box-shadow:0 10px 15px -3px rgba(0,0,0,.1)}50%{transform:scale(1.02);box-shadow:0 15px 25px -5px rgba(34,197,94,.3)}100%{transform:scale(1);box-shadow:0 10px 15px -3px rgba(0,0,0,.1)}}
.pulse-correct{animation:pulse .5s ease-in-out}
@keyframes flash-red{0%,100%{color:inherit;transform:scale(1)}50%{color:#ef4444;transform:scale(1.2)}}
.flash-penalty{animation:flash-red 1s ease-in-out}

.audio-circle-btn{
  width: 40px;
  height: 40px;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  overflow: hidden;
}
.audio-circle-btn svg{ width: 18px; height: 18px; }

.badge-picked{
  display: inline-block;
  line-height: 1.2;
  padding: 4px 8px;
  border-radius: 9999px;
  white-space: normal;
  text-align: center;
  align-items: center;
}

.cursor-zoom-in { cursor: zoom-in; }
.lightbox-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.3s ease;
  visibility: hidden;
}
.lightbox-overlay.visible {
  opacity: 1;
  visibility: visible;
}
.lightbox-content {
  cursor: default;
  transform: scale(0.8);
  transition: transform 0.3s ease;
  background-color: white;
  padding: 1rem;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  line-height: 0;
}
.lightbox-overlay.visible .lightbox-content {
  transform: scale(1);
}
.lightbox-content img {
  max-width: 90vw;
  max-height: 90vh;
  display: block;
}

/* --- Page Visibility --- */
.page.hidden { display: none; }

/* --- Animation Styles for FAB --- */
#fab {
    transition: transform 0.3s ease-in-out;
}
#fab.open {
    transform: rotate(-90deg); /* Turn left when open */
}
#fab-menu {
    pointer-events: none;
}
#fab-menu a {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}
#fab-menu.open {
    pointer-events: auto;
}
#fab-menu.open a {
    opacity: 1;
    transform: translateY(0);
}
#fab-menu.open a:nth-child(1) { transition-delay: 0.05s; }
#fab-menu.open a:nth-child(2) { transition-delay: 0.1s; }
#fab-menu.open a:nth-child(3) { transition-delay: 0.15s; }
#fab-menu.open a:nth-child(4) { transition-delay: 0.2s; }
#fab-menu.open a:nth-child(5) { transition-delay: 0.25s; }
#fab-menu.open a:nth-child(6) { transition-delay: 0.3s; }
.nav-link.active-link {
    background-color: #dbeafe;
    color: #2563eb;
    font-weight: 600;
}