/* css/components/micro-learning.css — TikTok-style micro-learning overlay */

/* ── Overlay backdrop ── */
.ml-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.ml-overlay-visible {
  opacity: 1;
}

/* ── Container ── */
.ml-container {
  width: 100%;
  max-width: 480px;
  height: 100dvh;
  max-height: 780px;
  display: flex;
  flex-direction: column;
  background: var(--white-snow, #f8fafc);
  border-radius: 28px;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.5);
  animation: bounceIn 0.4s ease-out;
}



/* ── Header ── */
.ml-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px 8px;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
}

.ml-close-btn {
  background: #f1f5f9;
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  color: #64748b;
  transition: background 0.15s;
}

.ml-close-btn:hover {
  background: #e2e8f0;
}

.ml-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--oxford-blue, #2D2E5F);
  flex: 1;
}

.ml-progress-text {
  font-size: 0.85rem;
  font-weight: 700;
  color: #64748b;
}

@media (max-width: 520px) {
  .ml-overlay {
    align-items: stretch;
  }

  .ml-container {
    max-width: none;
    max-height: none;
    height: 100dvh;
    border-radius: 0;
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .ml-header {
    padding: 12px 14px 8px;
  }
}

/* ── Progress bar ── */
.ml-progress-bar-wrapper {
  height: 4px;
  background: #e2e8f0;
}

.ml-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--oxford-blue, #2D2E5F), var(--accent-purple, #8b5cf6));
  transition: width 0.4s ease;
}

/* ── Cards viewport ── */
.ml-cards-viewport {
  flex: 1;
  overflow: hidden;
  position: relative;
  padding: 20px 20px 0;
}

.ml-card-slot {
  height: 100%;
  display: flex;
  align-items: flex-start;
}

/* ── Card ── */
.ml-card {
  width: 100%;
  background: #fff;
  border-radius: 22px;
  padding: 24px 22px;
  box-shadow: 0 8px 32px rgba(30, 58, 138, 0.12);
  border: 1px solid #e8edf5;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ml-card-enter {
  opacity: 0;
  transform: translateY(32px) scale(0.96);
}

.ml-card-visible {
  animation: mlCardIn 0.3s ease-out forwards;
}

.ml-card-exit {
  animation: mlCardOut 0.3s ease-in forwards;
}

/* ── Card contents ── */
.ml-card-source {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #94a3b8;
  font-weight: 700;
}

.ml-context {
  font-size: 0.88rem;
  color: #475569;
  background: #f8fafc;
  border-radius: 10px;
  padding: 10px 14px;
  line-height: 1.6;
  border-left: 3px solid var(--oxford-blue, #2D2E5F);
  max-height: 100px;
  overflow-y: auto;
}

.ml-question {
  font-size: 0.97rem;
  font-weight: 600;
  color: #1e293b;
  line-height: 1.5;
}

/* ── Options ── */
.ml-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ml-option-btn {
  width: 100%;
  text-align: left;
  padding: 12px 16px;
  border-radius: 12px;
  border: 2px solid #e2e8f0;
  background: #fff;
  font-size: 0.92rem;
  font-weight: 500;
  color: #334155;
  cursor: pointer;
  transition: all 0.15s;
}

.ml-option-btn:hover:not(:disabled) {
  border-color: var(--oxford-light, #4a4b7c);
  background: #eff6ff;
}

.ml-option-btn.ml-option-correct {
  border-color: #10b981;
  background: #ecfdf5;
  color: #065f46;
  font-weight: 700;
}

.ml-option-btn.ml-option-wrong {
  border-color: #ef4444;
  background: #fef2f2;
  color: #991b1b;
  font-weight: 700;
}

/* ── Transformations ── */
.ml-transform-sentence {
  font-size: 0.92rem;
  color: #334155;
  margin-bottom: 4px;
}

.ml-transform-keyword {
  font-size: 0.9rem;
  color: #2D2E5F;
  background: #eff6ff;
  display: inline-block;
  padding: 3px 10px;
  border-radius: 8px;
  margin-bottom: 6px;
}

.ml-transform-gapped {
  font-size: 0.92rem;
  color: #475569;
  font-style: italic;
}

.ml-transform-answer-area {
  display: flex;
  gap: 10px;
}

.ml-transform-input {
  flex: 1;
  padding: 10px 14px;
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  font-size: 0.92rem;
  outline: none;
  transition: border-color 0.15s;
}

.ml-transform-input:focus {
  border-color: var(--oxford-blue, #2D2E5F);
}

.ml-submit-btn {
  background: var(--oxford-blue, #2D2E5F);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s;
}

.ml-submit-btn:hover {
  opacity: 0.88;
}

/* ── Feedback ── */
.ml-feedback {
  font-size: 0.88rem;
  padding: 12px 14px;
  border-radius: 12px;
  line-height: 1.5;
  animation: fadeIn 0.25s ease-out;
}

.ml-feedback-correct {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.ml-feedback-wrong {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* ── Vibrate animation ── */
.ml-vibrate {
  animation: vibrate 0.4s ease-out;
}

/* ── Footer stats ── */
.ml-footer {
  padding: 14px 20px;
  background: #fff;
  border-top: 1px solid #e2e8f0;
  text-align: center;
}

.ml-stats {
  font-size: 0.85rem;
  font-weight: 600;
  color: #64748b;
}

/* ── Completion screen ── */
.ml-complete {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 20px;
  text-align: center;
  animation: bounceIn 0.5s ease-out;
}

.ml-complete-icon {
  font-size: 4rem;
}

.ml-complete-title {
  font-size: 1.5rem;
  font-weight: 900;
  color: #1e293b;
}

.ml-complete-score {
  font-size: 1.1rem;
  font-weight: 700;
  color: #475569;
}

.ml-complete-pct {
  font-size: 3rem;
  font-weight: 900;
  color: var(--oxford-blue, #2D2E5F);
}

.ml-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--oxford-blue, #2D2E5F);
  color: white;
  border: none;
  border-radius: 14px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  max-width: 280px;
  transition: opacity 0.15s;
}

.ml-btn-primary:hover {
  opacity: 0.88;
}

.ml-btn-primary .material-symbols-outlined {
  font-size: 1.15rem;
}

@media (max-width: 768px), (max-height: 520px) and (orientation: landscape) and (max-width: 1024px) {
  .ml-btn-primary .icon-btn-label {
    display: none;
  }
}

.ml-btn-secondary {
  background: transparent;
  color: var(--oxford-blue, #2D2E5F);
  border: 2px solid var(--oxford-blue, #2D2E5F);
  border-radius: 14px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  max-width: 280px;
  transition: all 0.15s;
}

.ml-btn-secondary:hover {
  background: #eff6ff;
}