/* ==========================================================================
   Bilikids Toddlers Interactive Academy Comprehensive Styles
   15 Units, 4 Skills, 12L Games, Explore Cards, Interactive Videos & Certifications
   ========================================================================== */

:root {
  --toddler-amber: #f59e0b;
  --toddler-amber-dark: #d97706;
  --toddler-amber-light: #fef3c7;
  --toddler-sky: #0ea5e9;
  --toddler-sky-light: #e0f2fe;
  --toddler-emerald: #10b981;
  --toddler-emerald-light: #d1fae5;
  --toddler-purple: #8b5cf6;
  --toddler-purple-light: #ede9fe;
  --toddler-rose: #f43f5e;
  --toddler-rose-light: #ffe4e6;
  --toddler-indigo: #6366f1;
  --toddler-bg: #fffdf5;
  --toddler-card: #ffffff;
  --toddler-border: #fde68a;
  --toddler-text: #78350f;
  --toddler-text-dark: #1f2937;
  --toddler-shadow: 0 10px 25px -5px rgba(217, 119, 6, 0.12), 0 8px 10px -6px rgba(217, 119, 6, 0.08);
}

body.toddler-body {
  background: linear-gradient(180deg, #fffbeb 0%, #fef3c7 35%, #ffffff 100%);
  color: var(--toddler-text-dark);
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: 'Fredoka', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

.toddler-container {
  max-width: 1240px;
  margin: 1.25rem auto 3.5rem;
  padding: 0 1.25rem;
  width: 100%;
  box-sizing: border-box;
}

/* ==========================================================================
   15-UNIT SELECTOR STRIP
   ========================================================================== */
.toddler-units-selector-wrap {
  margin-bottom: 0.65rem;
  position: relative;
}

.toddler-units-selector-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.toddler-units-selector-title {
  font-size: 0.9rem;
  font-weight: 800;
  color: #92400e;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toddler-units-toggle {
  border: 1px solid #f6c453;
  border-radius: 999px;
  background: #fffaf0;
  color: #8b4513;
  padding: 7px 13px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
  cursor: pointer;
  transition: background-color 0.18s ease, box-shadow 0.18s ease;
}

.toddler-units-toggle:hover,
.toddler-units-toggle:focus-visible {
  background: #fff0c2;
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
  outline: none;
}

.toddler-units-nav[hidden] {
  display: none !important;
}

.toddler-units-counter-badge {
  background: #f59e0b;
  color: #ffffff;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 800;
}

.toddler-units-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  overflow: visible;
  padding: 6px 4px 14px 4px;
  scrollbar-width: thin;
  scrollbar-color: #f59e0b #fde68a;
  -webkit-overflow-scrolling: touch;
}

.toddler-units-nav::-webkit-scrollbar {
  height: 6px;
}
.toddler-units-nav::-webkit-scrollbar-thumb {
  background: #f59e0b;
  border-radius: 999px;
}
.toddler-units-nav::-webkit-scrollbar-track {
  background: #fde68a;
  border-radius: 999px;
}

.toddler-nav-pill {
  background: #ffffff;
  border: 2px solid var(--toddler-border);
  padding: 9px 18px;
  border-radius: 20px;
  cursor: pointer;
  white-space: nowrap;
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--toddler-text);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  flex-shrink: 0;
  box-shadow: 0 3px 8px rgba(0,0,0,0.04);
}

.toddler-nav-pill:hover {
  background: #fef3c7;
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(245, 158, 11, 0.22);
}

.toddler-nav-pill.active {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  border-color: #b45309;
  color: #ffffff;
  box-shadow: 0 6px 16px rgba(217, 119, 6, 0.35);
  transform: translateY(-2px);
}

.toddler-nav-pill .unit-num-badge {
  background: rgba(255, 255, 255, 0.25);
  color: inherit;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 12px;
}

/* ==========================================================================
   UNIT HEADER CARD
   ========================================================================== */
.toddler-header-box {
  background: #ffffff;
  border: 2.5px solid var(--toddler-border);
  border-radius: 26px;
  padding: 1.5rem 2rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--toddler-shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  position: relative;
  overflow: hidden;
}

.toddler-header-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, #f59e0b, #10b981, #0ea5e9, #8b5cf6, #f43f5e);
}

.toddler-header-left {
  flex: 1;
  min-width: 280px;
}

.toddler-unit-tag {
  background: var(--toddler-amber-light);
  color: #92400e;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 5px 14px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 0.5rem;
  border: 1px solid #fde68a;
}

.toddler-unit-title {
  margin: 0 0 0.4rem;
  font-size: 1.85rem;
  font-weight: 900;
  color: #78350f;
  line-height: 1.2;
  display: flex;
  align-items: center;
  gap: 10px;
}

.toddler-unit-desc {
  margin: 0;
  color: #4b5563;
  font-size: 1rem;
  line-height: 1.45;
  max-width: 780px;
}

.toddler-score-badge {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border: 2.5px solid #f59e0b;
  color: #92400e;
  padding: 12px 24px;
  border-radius: 22px;
  font-size: 1.4rem;
  font-weight: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.2);
  flex-shrink: 0;
}

.toddler-score-badge .score-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 800;
  color: #b45309;
}

/* ==========================================================================
   UNIT SECTIONS MAIN TABS (Explore, Listening, Reading, Writing, Speaking, Videos, Game, Final, Progress)
   ========================================================================== */
.toddler-tabs-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  overflow: visible;
  padding: 4px 0 14px;
  margin-bottom: 1rem;
  border-bottom: 2px solid #fde68a;
}


.toddler-tab-btn {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  padding: 10px 18px;
  border-radius: 16px;
  font-size: 0.95rem;
  font-weight: 800;
  color: #4b5563;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.toddler-tab-btn:hover {
  background: #f9fafb;
  border-color: #f59e0b;
  color: #92400e;
  transform: translateY(-2px);
}

.toddler-tab-btn.active {
  background: #fef3c7;
  border-color: #f59e0b;
  color: #b45309;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}

.toddler-tab-btn.tab-listening.active {
  background: #e0f2fe;
  border-color: #0ea5e9;
  color: #0369a1;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
}

.toddler-tab-btn.tab-reading.active {
  background: #ede9fe;
  border-color: #8b5cf6;
  color: #5b21b6;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.25);
}

.toddler-tab-btn.tab-writing.active {
  background: #d1fae5;
  border-color: #10b981;
  color: #047857;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.toddler-tab-btn.tab-speaking.active {
  background: #ffe4e6;
  border-color: #f43f5e;
  color: #be123c;
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.25);
}

.toddler-tab-btn.tab-game.active {
  background: #fdf4ff;
  border-color: #d946ef;
  color: #86198f;
  box-shadow: 0 4px 12px rgba(217, 70, 239, 0.25);
}

.toddler-tab-btn.tab-challenge.active {
  background: #fef9c3;
  border-color: #eab308;
  color: #854d0e;
  box-shadow: 0 4px 12px rgba(234, 179, 8, 0.25);
}

/* ==========================================================================
   WORKSPACE CONTAINER
   ========================================================================== */
.toddler-workspace-card {
  background: #ffffff;
  border: 2px solid var(--toddler-border);
  border-radius: 26px;
  padding: 1.75rem;
  box-shadow: var(--toddler-shadow);
  min-height: 520px;
  box-sizing: border-box;
}

/* ==========================================================================
   SECTION: EXPLORE (FLASHCARDS, PHONICS & FACTS)
   ========================================================================== */
.explore-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.explore-card {
  background: #ffffff;
  border: 2.5px solid #fde68a;
  border-radius: 22px;
  padding: 1.5rem 1.25rem;
  text-align: center;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.08);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.explore-card:hover {
  transform: translateY(-6px);
  border-color: #f59e0b;
  box-shadow: 0 12px 28px rgba(245, 158, 11, 0.24);
}

.explore-icon {
  font-size: 3.8rem;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.12));
  transition: transform 0.2s ease;
}

.explore-card:hover .explore-icon {
  transform: scale(1.18) rotate(3deg);
}

.explore-word {
  font-size: 1.5rem;
  font-weight: 900;
  color: #78350f;
  margin: 0 0 0.4rem;
}

.explore-fact {
  font-size: 0.94rem;
  color: #4b5563;
  line-height: 1.45;
  margin: 0 0 1.2rem;
}

.explore-audio-btn {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #92400e;
  border: 1.5px solid #f59e0b;
  border-radius: 999px;
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
  margin: 0 auto;
  box-shadow: 0 2px 6px rgba(245, 158, 11, 0.15);
}

.explore-audio-btn:hover {
  background: #f59e0b;
  color: #ffffff;
  border-color: #d97706;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
}

/* ==========================================================================
   SKILL SUB-NAVIGATION (6 ACTIVITIES PER SKILL)
   ========================================================================== */
.skill-activities-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  overflow: visible;
  padding: 4px 0 16px;
  margin-bottom: 1.5rem;
  border-bottom: 1.5px dashed #e5e7eb;
}

.skill-activity-btn {
  background: #f9fafb;
  border: 1.5px solid #d1d5db;
  padding: 8px 16px;
  border-radius: 14px;
  font-size: 0.88rem;
  font-weight: 700;
  color: #4b5563;
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.skill-activity-btn:focus-visible {
  outline: 4px solid #2563eb;
  outline-offset: 2px;
}

.skill-activity-btn:hover {
  background: #f3f4f6;
  border-color: #9ca3af;
}

.skill-activity-btn.active {
  background: #fef3c7;
  border-color: #f59e0b;
  color: #92400e;
  font-weight: 800;
}

/* ==========================================================================
   EXERCISE RUNNER BOX
   ========================================================================== */
.exercise-runner-box {
  max-width: 860px;
  margin: 0 auto;
}

.exercise-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 10px;
}

.exercise-progress-dots {
  display: flex;
  gap: 8px;
  align-items: center;
}

.exercise-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #e5e7eb;
  transition: all 0.2s ease;
}

.exercise-dot.active {
  background: #f59e0b;
  transform: scale(1.25);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
}

.exercise-dot.completed {
  background: #10b981;
}

.exercise-prompt-card {
  background: #fdfaf3;
  border: 2px dashed #fcd34d;
  border-radius: 22px;
  padding: 1.6rem;
  text-align: center;
  margin-bottom: 1.75rem;
}

.exercise-instruction {
  font-size: 1.3rem;
  font-weight: 900;
  color: #78350f;
  margin: 0 0 0.5rem;
}

.exercise-sub-instruction {
  font-size: 0.96rem;
  color: #6b7280;
  margin: 0;
}

.exercise-audio-trigger {
  margin-top: 1rem;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff;
  border: none;
  border-radius: 999px;
  padding: 10px 24px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
  transition: all 0.15s ease;
}

.exercise-audio-trigger:hover {
  background: #d97706;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(245, 158, 11, 0.45);
}

/* Choices Grid */
.exercise-choices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.exercise-choice-card {
  appearance: none;
  width: 100%;
  font: inherit;
  color: inherit;
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 20px;
  padding: 1.4rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 10px rgba(0,0,0,0.04);
  min-height: 125px;
}

.exercise-choice-card:hover {
  transform: translateY(-5px);
  border-color: #f59e0b;
  box-shadow: 0 8px 20px rgba(245, 158, 11, 0.25);
}

.exercise-choice-card:focus-visible {
  outline: 4px solid #2563eb;
  outline-offset: 3px;
  z-index: 1;
}

.exercise-choice-card .choice-icon {
  font-size: 3.2rem;
  margin-bottom: 0.35rem;
}

.exercise-choice-card .choice-text {
  font-size: 1.2rem;
  font-weight: 800;
  color: #374151;
}

.exercise-choice-card.correct {
  background: #d1fae5;
  border-color: #10b981;
  color: #065f46;
  transform: scale(1.03);
}

.exercise-choice-card.wrong {
  background: #fee2e2;
  border-color: #ef4444;
  color: #991b1b;
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* ==========================================================================
   WRITING EXERCISE COMPONENTS (MAGNET TILES, SLOTS, VIRTUAL KEYBOARDS)
   ========================================================================== */
.writing-slots-container {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.writing-slot {
  width: 54px;
  height: 62px;
  border: 2.5px dashed #f59e0b;
  border-radius: 14px;
  background: #fffbeb;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 900;
  color: #78350f;
  cursor: pointer;
  transition: all 0.2s ease;
}

.writing-slot.filled {
  border-style: solid;
  border-color: #10b981;
  background: #ecfdf5;
  color: #047857;
}

.writing-tiles-pool {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.writing-letter-tile {
  background: linear-gradient(135deg, #ffffff 0%, #fef3c7 100%);
  border: 2px solid #f59e0b;
  border-radius: 14px;
  padding: 10px 18px;
  font-size: 1.6rem;
  font-weight: 900;
  color: #92400e;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.2);
  transition: all 0.15s ease;
  user-select: none;
}

.writing-letter-tile:hover {
  transform: translateY(-3px);
  background: #f59e0b;
  color: #ffffff;
}

.writing-letter-tile.used {
  opacity: 0.35;
  pointer-events: none;
}

.writing-input-box {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 1.5rem 0;
}

.writing-text-input {
  border: 2.5px solid #d1d5db;
  border-radius: 16px;
  padding: 12px 20px;
  font-size: 1.4rem;
  font-weight: 800;
  color: #1f2937;
  text-align: center;
  outline: none;
  width: 280px;
  transition: border-color 0.2s ease;
}

.writing-text-input:focus {
  border-color: #f59e0b;
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
}

.writing-check-btn {
  background: #10b981;
  color: #ffffff;
  border: none;
  border-radius: 16px;
  padding: 12px 26px;
  font-size: 1.1rem;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.15s ease;
}

.writing-check-btn:hover {
  background: #059669;
}

/* ==========================================================================
   SPEAKING EXERCISE COMPONENTS (RECORDER & SPEECH RECOGNITION)
   ========================================================================== */
.speaking-panel {
  text-align: center;
  padding: 1.5rem 1rem;
}

.speaking-target-phrase {
  font-size: 2rem;
  font-weight: 900;
  color: #be123c;
  margin: 1rem 0;
}

.speaking-mic-btn {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, #f43f5e 0%, #e11d48 100%);
  border: 4px solid #ffffff;
  box-shadow: 0 8px 24px rgba(244, 63, 94, 0.4);
  color: #ffffff;
  font-size: 2.2rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  margin: 1.5rem 0;
}

.speaking-mic-btn:hover {
  transform: scale(1.08);
}

.speaking-mic-btn.recording {
  background: #dc2626;
  animation: pulse-ring 1.25s infinite;
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.7); }
  70% { box-shadow: 0 0 0 22px rgba(220, 38, 38, 0); }
  100% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0); }
}

.speaking-feedback-badge {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 800;
  margin-top: 1rem;
}

.speaking-feedback-badge.success {
  background: #d1fae5;
  color: #047857;
  border: 1.5px solid #10b981;
}

/* ==========================================================================
   INTERACTIVE VIDEOS & CHECKPOINTS
   ========================================================================== */
.video-section-wrap {
  max-width: 900px;
  margin: 0 auto;
}

.video-player-frame-box {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
  margin-bottom: 1.75rem;
  background: #000;
}

.video-player-frame-box iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-checkpoints-card {
  background: #fdfaf3;
  border: 2px solid #fde68a;
  border-radius: 20px;
  padding: 1.5rem;
}

.video-checkpoint-item {
  background: #ffffff;
  border: 1.5px solid #e5e7eb;
  border-radius: 16px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

/* ==========================================================================
   MAIN GAME (12 PROGRESSIVE LEVELS)
   ========================================================================== */
.game-levels-map-wrap {
  padding: 1rem 0;
}

.game-levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
}

.game-level-node {
  background: #ffffff;
  border: 2.5px solid #e5e7eb;
  border-radius: 22px;
  padding: 1.25rem;
  text-align: center;
  position: relative;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 10px rgba(0,0,0,0.03);
}

.game-level-node.unlocked {
  border-color: #f59e0b;
  cursor: pointer;
}

.game-level-node.unlocked:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 24px rgba(245, 158, 11, 0.25);
}

.game-level-node.locked {
  background: #f9fafb;
  opacity: 0.65;
  filter: grayscale(0.5);
  cursor: not-allowed;
}

.game-level-node.completed {
  border-color: #10b981;
  background: #f0fdf4;
}

.game-level-num {
  font-size: 1.1rem;
  font-weight: 900;
  color: #78350f;
  margin-bottom: 0.35rem;
}

.game-level-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.game-level-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #374151;
  margin-bottom: 0.5rem;
}

.game-level-stars {
  font-size: 1.1rem;
  color: #f59e0b;
}

/* ==========================================================================
   FINAL INTEGRATIVE CHALLENGE (10 STEPS)
   ========================================================================== */
.final-challenge-stepper-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.challenge-stepper-bar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2rem;
  position: relative;
}

.challenge-step-badge {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #e5e7eb;
  color: #4b5563;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.challenge-step-badge.active {
  background: #f59e0b;
  color: #ffffff;
  transform: scale(1.2);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.5);
}

.challenge-step-badge.completed {
  background: #10b981;
  color: #ffffff;
}

/* ==========================================================================
   DIPLOMA / COMPLETION MODAL & CONFETTI
   ========================================================================== */
.diploma-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1.5rem;
}

.diploma-modal-card {
  background: #ffffff;
  border: 4px solid #f59e0b;
  border-radius: 30px;
  max-width: 600px;
  width: 100%;
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  position: relative;
  animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes popIn {
  0% { transform: scale(0.85); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.diploma-ribbon-badge {
  font-size: 4rem;
  margin-bottom: 0.5rem;
}

.diploma-title {
  font-size: 2rem;
  font-weight: 900;
  color: #b45309;
  margin: 0 0 0.5rem;
}

.diploma-desc {
  font-size: 1.1rem;
  color: #4b5563;
  margin-bottom: 1.5rem;
}

.diploma-close-btn {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff;
  border: none;
  border-radius: 999px;
  padding: 12px 32px;
  font-size: 1.15rem;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(245, 158, 11, 0.35);
}

/* ==========================================================================
   PROGRESS & ASSESSMENT DASHBOARD
   ========================================================================== */
.progress-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.progress-skill-card {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 20px;
  padding: 1.25rem;
  text-align: center;
}

.progress-skill-card.listening { border-color: #0ea5e9; }
.progress-skill-card.reading { border-color: #8b5cf6; }
.progress-skill-card.writing { border-color: #10b981; }
.progress-skill-card.speaking { border-color: #f43f5e; }

.progress-meter-track {
  width: 100%;
  height: 12px;
  background: #e5e7eb;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 0.75rem;
}

.progress-meter-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* ==========================================================================
   MECHANIC A: BUBBLE POP RUSH (FLOATING BUBBLES)
   ========================================================================== */
.bubble-pond-container {
  position: relative;
  min-height: 340px;
  background: radial-gradient(circle at center, #f0f9ff 0%, #e0f2fe 100%);
  border-radius: 24px;
  border: 3px dashed #38bdf8;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  padding: 2rem 1rem;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.floating-bubble-item {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.95), rgba(56, 189, 248, 0.45));
  border: 3px solid rgba(255, 255, 255, 0.85);
  box-shadow: 0 10px 25px rgba(14, 165, 233, 0.35), inset 0 0 15px rgba(255, 255, 255, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  animation: floatBubble 3s ease-in-out infinite alternate;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
}

.floating-bubble-item:nth-child(2) {
  animation-duration: 3.6s;
  animation-delay: -1s;
}
.floating-bubble-item:nth-child(3) {
  animation-duration: 4.2s;
  animation-delay: -2s;
}

@keyframes floatBubble {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-16px) rotate(3deg); }
  100% { transform: translateY(8px) rotate(-3deg); }
}

.floating-bubble-item:hover {
  transform: scale(1.15) !important;
  box-shadow: 0 15px 35px rgba(14, 165, 233, 0.5);
}

.floating-bubble-item.popping {
  animation: popBurst 0.4s forwards;
}

@keyframes popBurst {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.8; filter: brightness(1.5); }
  100% { transform: scale(0); opacity: 0; }
}

/* ==========================================================================
   MECHANIC B: MEMORY CARDS FLIP BOARD
   ========================================================================== */
.memory-board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1.25rem;
  max-width: 680px;
  margin: 1.5rem auto 2rem;
  perspective: 1000px;
}

.memory-card-box {
  height: 140px;
  cursor: pointer;
  perspective: 1000px;
}

.memory-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.5s;
  transform-style: preserve-3d;
  border-radius: 18px;
}

.memory-card-box.flipped .memory-card-inner {
  transform: rotateY(180deg);
}

.memory-card-front, .memory-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 14px rgba(0,0,0,0.08);
}

.memory-card-front {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white;
  border: 3px solid #fef3c7;
  font-size: 2.2rem;
  font-weight: 900;
}

.memory-card-back {
  background: #ffffff;
  color: #1f2937;
  border: 3px solid #10b981;
  transform: rotateY(180deg);
}

/* ==========================================================================
   MECHANIC C: MYSTERY SHADOW DETECTIVE
   ========================================================================== */
.shadow-detective-stage {
  max-width: 500px;
  margin: 1.5rem auto;
  background: #f8fafc;
  border: 3px solid #cbd5e1;
  border-radius: 24px;
  padding: 2rem;
  text-align: center;
  position: relative;
}

.silhouette-display {
  font-size: 5rem;
  filter: brightness(0) drop-shadow(0 4px 10px rgba(0,0,0,0.25));
  margin: 1rem 0;
  animation: pulseShadow 2s infinite ease-in-out;
}

@keyframes pulseShadow {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

/* ==========================================================================
   MECHANIC D: SENTENCE PUZZLE TRAIN WAGONS
   ========================================================================== */
.sentence-train-track {
  background: #f1f5f9;
  border-bottom: 4px solid #64748b;
  border-radius: 18px;
  padding: 1.5rem 1rem;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  margin: 1.5rem 0;
  min-height: 90px;
}

.train-wagon-block {
  background: #ffffff;
  border: 2px solid #0ea5e9;
  border-radius: 14px;
  padding: 10px 18px;
  font-size: 1.25rem;
  font-weight: 800;
  color: #0369a1;
  box-shadow: 0 4px 10px rgba(14, 165, 233, 0.2);
  cursor: pointer;
  position: relative;
}

.train-wagon-block::after {
  content: '🔗';
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.8rem;
}

.train-wagon-block:last-child::after {
  content: '';
}

/* ==========================================================================
   MECHANIC E: KIDS COLORFUL ON-SCREEN KEYBOARD
   ========================================================================== */
.kids-keyboard-wrap {
  max-width: 650px;
  margin: 1.5rem auto 0;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 20px;
  padding: 1rem;
}

.kids-keyboard-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 8px;
}

.kids-key-btn {
  background: #ffffff;
  border: 2px solid #cbd5e1;
  border-radius: 12px;
  width: 44px;
  height: 48px;
  font-size: 1.3rem;
  font-weight: 900;
  color: #334155;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 6px rgba(0,0,0,0.06);
  transition: all 0.1s ease;
}

.kids-key-btn:hover {
  background: #fef3c7;
  border-color: #f59e0b;
  transform: translateY(-2px);
}

.kids-key-btn:active {
  transform: translateY(2px);
}

.kids-key-btn.action-key {
  width: auto;
  padding: 0 16px;
  font-size: 0.95rem;
  background: #f1f5f9;
}

/* ==========================================================================
   MECHANIC F: PARROT ECHO SPEAKING STUDIO
   ========================================================================== */
.parrot-studio-card {
  max-width: 600px;
  margin: 1rem auto;
  background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
  border: 3px solid #fda4af;
  border-radius: 26px;
  padding: 2rem 1.5rem;
  text-align: center;
}

.parrot-mascot-box {
  font-size: 5rem;
  margin-bottom: 0.5rem;
  animation: parrotHop 1.5s infinite ease-in-out alternate;
}

@keyframes parrotHop {
  0% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(4deg); }
  100% { transform: translateY(0) rotate(-4deg); }
}

/* ==========================================================================
   INTERACTIVE VIDEO & THEATER STAGE
   ========================================================================== */
.theater-mode-tabs {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.theater-mode-btn {
  background: #ffffff;
  border: 2px solid #fde68a;
  border-radius: 999px;
  padding: 8px 20px;
  font-size: 0.95rem;
  font-weight: 800;
  color: #78350f;
  cursor: pointer;
}

.theater-mode-btn.active {
  background: #f59e0b;
  color: #ffffff;
  border-color: #d97706;
}

.interactive-karaoke-stage {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  border-radius: 24px;
  padding: 2rem;
  color: #ffffff;
  text-align: center;
  box-shadow: 0 12px 30px rgba(30, 27, 75, 0.4);
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.stage-dancer-row {
  display: flex;
  justify-content: center;
  gap: 3rem;
  font-size: 4rem;
  margin: 1rem 0;
}

.stage-dancer {
  animation: danceBeat 0.8s infinite alternate ease-in-out;
}

.stage-dancer:nth-child(2) {
  animation-delay: -0.4s;
}

@keyframes danceBeat {
  0% { transform: translateY(0) scale(1) rotate(-5deg); }
  100% { transform: translateY(-18px) scale(1.1) rotate(5deg); }
}

.stage-lyrics-box {
  font-size: 1.5rem;
  font-weight: 900;
  color: #fde047;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
  margin: 1.5rem 0;
  min-height: 48px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .skill-activities-nav,
  .toddler-tabs-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    overflow: visible;
    gap: 8px;
  }
  .skill-activities-nav {
    grid-template-columns: minmax(0, 1fr);
  }
  .skill-activity-btn {
    justify-content: flex-start;
  }
  .skill-activity-btn,
  .toddler-tab-btn {
    width: 100%;
    min-width: 0;
    justify-content: center;
    text-align: center;
    white-space: normal;
    padding: 9px 7px;
    min-height: 44px;
  }

  .bubble-pond-container {
    min-height: 280px;
  }
  .floating-bubble-item {
    width: 110px;
    height: 110px;
  }
  .memory-board-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .explore-grid {
    grid-template-columns: 1fr;
  }
  .exercise-choices-grid {
    grid-template-columns: 1fr;
  }
  .toddler-header-box {
    padding: 1rem 1.15rem;
    gap: 0.85rem;
  }
  .toddler-unit-title {
    font-size: 1.35rem;
  }
  .toddler-header-left {
    min-width: 100%;
  }
  .toddler-nav-pill {
    padding: 7px 12px;
    font-size: 0.82rem;
    min-height: 42px;
  }
  #toddlerUnitsNav {
    display: block;
    overflow: visible;
  }
  .toddler-units-selector-wrap .toddler-units-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 8px;
    gap: 7px;
  }
  .toddler-units-nav .toddler-nav-pill {
    width: 100%;
    min-width: 0;
    flex-shrink: 1;
    justify-content: center;
    text-align: center;
    white-space: normal;
    gap: 4px;
    padding: 8px 5px;
    font-size: 0.76rem;
    line-height: 1.15;
  }
}

@media (max-width: 480px) {
  .toddler-unit-title {
    font-size: 1.18rem;
  }
  .toddler-score-badge {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
}