/* ==========================================================================
   BILIKIDS KIDS UNITS - ADVANCED MOBILE RESPONSIVE ENGINE (320px - 768px)
   Fixes Clumping, Truncations, Viewport Overflow, and Touch Interactions
   ========================================================================== */

@media (max-width: 768px) {
  /* Navigation & Header */
  .unit-nav {
    padding: 8px 12px !important;
  }
  .unit-nav-inner {
    flex-wrap: wrap !important;
    gap: 8px !important;
    justify-content: space-between !important;
  }
  .btn-back-map {
    order: 1 !important;
    font-size: 0.8rem !important;
    padding: 5px 12px !important;
  }
  .unit-score-pill {
    order: 2 !important;
    font-size: 0.82rem !important;
    padding: 4px 10px !important;
  }
  .unit-title-header {
    order: 3 !important;
    width: 100% !important;
    margin-top: 4px !important;
    gap: 6px !important;
  }
  .unit-name-head {
    font-size: 1rem !important;
    white-space: normal !important;
    line-height: 1.3 !important;
  }

  /* Activity Tabs Bar */
  .activity-tabs-bar {
    padding: 0 8px !important;
    margin: 10px auto 6px !important;
    max-width: 100% !important;
  }
  .tabs-track {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    overflow: visible !important;
    gap: 6px !important;
    padding: 4px !important;
  }
  .tab-btn {
    width: 100% !important;
    min-width: 0 !important;
    padding: 8px 12px !important;
    font-size: 0.85rem !important;
    white-space: normal !important;
    text-align: center !important;
    line-height: 1.2 !important;
    min-height: 44px !important;
  }

  /* Workspace & Card Containers */
  .unit-workspace {
    padding: 0 8px !important;
    margin: 10px auto 30px !important;
    max-width: 100% !important;
  }
  .unit-card, .activity-container, .activity-workspace-card {
    padding: 1rem !important;
    border-radius: 18px !important;
  }

  /* Chat & Conversation Scenario View */
  .story-header {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 8px !important;
  }
  .story-heading {
    font-size: 1.15rem !important;
  }
  .scenarios-selector-wrap {
    padding: 10px !important;
    border-radius: 14px !important;
  }
  .scenarios-chips-row {
    display: flex !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: thin !important;
    scrollbar-color: rgba(99, 102, 241, 0.55) transparent !important;
    gap: 6px !important;
    padding-bottom: 4px !important;
  }
  .scenarios-chips-row::-webkit-scrollbar {
    height: 5px !important;
  }
  .scenarios-chips-row::-webkit-scrollbar-thumb {
    background: rgba(99, 102, 241, 0.55) !important;
    border-radius: 99px !important;
  }
  .scenario-chip-btn {
    flex-shrink: 0 !important;
    padding: 7px 12px !important;
    font-size: 0.82rem !important;
    white-space: nowrap !important;
    min-height: 40px !important;
  }
  .story-chat-flow {
    padding: 10px !important;
    gap: 12px !important;
    max-height: 420px !important;
  }
  .chat-bubble-row {
    gap: 8px !important;
    width: 100% !important;
  }
  .character-avatar-bubble {
    width: 38px !important;
    height: 38px !important;
    font-size: 1.3rem !important;
    flex-shrink: 0 !important;
  }
  .chat-message-bubble {
    max-width: 86% !important;
    padding: 10px 12px !important;
    border-radius: 14px !important;
    box-sizing: border-box !important;
  }
  .chat-sender-name {
    display: flex !important;
    flex-wrap: wrap !important;
    justify-content: space-between !important;
    align-items: center !important;
    gap: 6px !important;
    margin-bottom: 4px !important;
  }
  .btn-mini-listen, .chat-audio-btn, .chat-listen-btn {
    font-size: 0.72rem !important;
    padding: 3px 8px !important;
    border-radius: 999px !important;
    white-space: nowrap !important;
    min-height: 28px !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 4px !important;
    flex-shrink: 0 !important;
    background: #ede9fe !important;
    border: 1px solid #c4b5fd !important;
    color: #6366f1 !important;
    cursor: pointer !important;
  }
  .chat-text {
    font-size: 0.95rem !important;
    line-height: 1.4 !important;
    word-break: break-word !important;
  }

  /* Interactive Choice Buttons & Prompts */
  .options-container, .choices-grid, .dialogue-options-grid {
    display: flex !important;
    flex-direction: column !important;
    gap: 8px !important;
    width: 100% !important;
  }
  .choice-btn, .option-btn, .dialogue-choice-btn {
    min-height: 48px !important;
    padding: 12px 14px !important;
    font-size: 0.92rem !important;
    text-align: left !important;
    white-space: normal !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  /* Vocabulary Cards Grid */
  .words-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
  }
  .word-card {
    padding: 10px !important;
    border-radius: 14px !important;
  }
  .word-icon {
    font-size: 1.8rem !important;
  }
  .word-en {
    font-size: 0.92rem !important;
  }
  .word-es {
    font-size: 0.78rem !important;
  }

  /* Sentence Builder / Word Banks */
  .word-bank-chips {
    gap: 6px !important;
    flex-wrap: wrap !important;
  }
  .word-chip {
    padding: 8px 12px !important;
    font-size: 0.88rem !important;
    min-height: 44px !important;
    border-radius: 12px !important;
  }
  .sentence-drop-zone {
    min-height: 52px !important;
    padding: 8px !important;
  }
}

@media (max-width: 420px) {
  .words-grid {
    grid-template-columns: 1fr !important;
  }
  .unit-name-head {
    font-size: 0.92rem !important;
  }
  .tab-btn {
    min-width: 105px !important;
    font-size: 0.8rem !important;
    padding: 6px 10px !important;
  }
  .chat-message-bubble {
    max-width: 90% !important;
  }
}