/* Hoi Nhap Duc - Das Leben in Deutschland Study & Exam Application Styles (Strict Light Theme) */

:root {
  --hnd-bg: #f8fafc;
  --hnd-card-bg: #ffffff;
  --hnd-card-border: #cbd5e1;
  --hnd-text-main: #0f172a;
  --hnd-text-muted: #64748b;
  --hnd-primary: #2563eb;
  --hnd-primary-hover: #1d4ed8;
  --hnd-gold: #d97706;
  --hnd-gold-hover: #b45309;
  --hnd-success: #059669;
  --hnd-success-bg: rgba(16, 185, 129, 0.12);
  --hnd-danger: #dc2626;
  --hnd-danger-bg: rgba(239, 68, 68, 0.12);
  --hnd-accent: #7c3aed;
  --hnd-radius: 16px;
  --hnd-radius-sm: 8px;
  --hnd-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  --hnd-font-title: 'Be Vietnam Pro', sans-serif;
  --hnd-font-body: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, sans-serif;
}

.hoinhapduc-container {
  font-family: var(--hnd-font-body);
  background-color: var(--hnd-bg);
  color: var(--hnd-text-main);
  border-radius: var(--hnd-radius);
  padding: 2rem;
  box-shadow: var(--hnd-shadow);
  max-width: 1200px;
  margin: 2rem auto;
  position: relative;
  box-sizing: border-box;
  
}

/* App Header & Navigation */
.hnd-app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
  border-bottom: 2px solid var(--hnd-card-border);
}

.hnd-app-logo {
  display: flex;
  flex-direction: column;
  font-family: var(--hnd-font-title);
  font-size: 1.45rem;
  font-weight: 800;
  color: #0f172a !important;
}

.hnd-nav-tabs {
  display: flex;
  gap: 8px;
  background: #e2e8f0;
  padding: 4px;
  border-radius: var(--hnd-radius-sm);
}

.hnd-tab-btn {
  background: transparent;
  border: none;
  color: #475569;
  padding: 0.65rem 1.3rem;
  border-radius: var(--hnd-radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.hnd-tab-btn.active,
.hnd-tab-btn:hover {
  background: #ffffff;
  color: var(--hnd-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Controls & Filter Bar */
.hnd-controls-bar {
  background: #ffffff;
  
  padding: 1.25rem;
  border-radius: var(--hnd-radius);
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

.hnd-filter-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.hnd-select-custom,
.hnd-input-search {
  background: #ffffff;
  
  color: var(--hnd-text-main);
  padding: 0.65rem 1rem;
  border-radius: var(--hnd-radius-sm);
  font-size: 0.925rem;
  outline: none;
}

.hnd-input-search {
  flex: 1;
  min-width: 250px;
}

/* Pagination Bar Styles */
.hnd-pagination-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  background: #ffffff;
  
  padding: 1rem 1.5rem;
  border-radius: var(--hnd-radius);
  margin: 1.5rem 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.hnd-page-info {
  font-size: 0.95rem;
  color: var(--hnd-text-muted);
}

.hnd-page-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hnd-btn-page {
  background: var(--hnd-primary);
  color: #ffffff;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: var(--hnd-radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.hnd-btn-page:hover:not(:disabled) {
  background: var(--hnd-primary-hover);
}

.hnd-btn-page:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.hnd-select-page {
  background: #ffffff;
  
  color: var(--hnd-text-main);
  padding: 0.55rem 0.9rem;
  border-radius: var(--hnd-radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
}

/* Questions Grid & Cards */
.hnd-questions-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hnd-qcard {
  background: #ffffff;
  
  border-radius: var(--hnd-radius);
  padding: 1.75rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
  transition: all 0.2s ease;
}

.hnd-qcard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 0.75rem;
}

.hnd-qmeta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hnd-qnum {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--hnd-gold-hover);
}

.hnd-tag {
  background: #eff6ff;
  color: var(--hnd-primary);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid #bfdbfe;
}

.hnd-tag-state {
  background: #fffbeb;
  color: var(--hnd-gold-hover);
  border-color: #fde68a;
}

/* Translate Toggle Button */
.hnd-btn-translate {
  background: #f0fdf4;
  border: 1px solid #a7f3d0;
  color: #047857;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hnd-btn-translate:hover,
.hnd-btn-translate.active {
  background: #059669;
  color: #ffffff;
  border-color: #059669;
}

/* Question Title */
.hnd-qtitle-de {
  font-family: var(--hnd-font-title);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 0.85rem;
  color: #0f172a;
}

.hnd-qtitle-vi {
  font-size: 1.05rem;
  color: #047857;
  line-height: 1.55;
  margin-bottom: 1.25rem;
  background: #f0fdf4;
  padding: 0.85rem 1.1rem;
  border-radius: 8px;
  border-left: 4px solid #059669;
}

.hnd-qimages {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1.25rem;
  margin: 1.25rem 0 1.5rem 0;
  background: #f8fafc;
  padding: 1.25rem;
  border-radius: 12px;
  
}

.hnd-qimage-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.hnd-qimage-label {
  font-weight: 800;
  font-size: 0.8rem;
  color: #2563eb;
  background: #dbeafe;
  padding: 2px 10px;
  border-radius: 999px;
}

.hnd-qimage {
  max-height: 140px;
  max-width: 160px;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  padding: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* Options */
.hnd-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.hnd-opt-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: #f8fafc;
  
  padding: 0.9rem 1.25rem;
  border-radius: var(--hnd-radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.hnd-opt-item:hover {
  border-color: var(--hnd-primary);
  background: #eff6ff;
}

.hnd-opt-item.selected {
  border-color: var(--hnd-primary);
  background: #dbeafe;
}

.hnd-opt-item.correct {
  border-color: #059669;
  background: #d1fae5;
}

.hnd-opt-item.wrong {
  border-color: #dc2626;
  background: #fee2e2;
}

.hnd-opt-item.correct-highlight {
  border-color: #059669;
  background: #ecfdf5;
}

.hnd-opt-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #cbd5e1;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.hnd-opt-text {
  flex: 1;
}

.hnd-opt-de {
  font-size: 1rem;
  font-weight: 600;
  color: #0f172a;
  line-height: 1.4;
}

.hnd-opt-vi {
  font-size: 0.9rem;
  color: #047857;
  margin-top: 4px;
  background: rgba(5, 150, 105, 0.08);
  padding: 3px 8px;
  border-radius: 4px;
}

/* Explanation Box */
.hnd-explanation-box {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}

.hnd-explanation-title {
  font-weight: 700;
  color: #b45309;
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.hnd-explanation-text {
  font-size: 0.925rem;
  color: #78350f;
  line-height: 1.5;
}

/* Exam Mode Styles */
.hnd-exam-container {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
}

@media (max-width: 991px) {
  .hnd-exam-container {
    grid-template-columns: 1fr;
  }
}

.hnd-exam-sidebar {
  background: #ffffff;
  
  border-radius: var(--hnd-radius);
  padding: 1.5rem;
  height: fit-content;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.hnd-timer-card {
  text-align: center;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.hnd-timer-val {
  font-family: var(--hnd-font-title);
  font-size: 2.2rem;
  font-weight: 800;
  color: #dc2626;
}

.hnd-timer-label {
  font-size: 0.85rem;
  color: #991b1b;
}

.hnd-qmatrix {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-bottom: 1rem;
}

.hnd-qmatrix-btn {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: #0f172a;
  padding: 0.5rem;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
}

.hnd-qmatrix-btn.answered {
  background: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
}

.hnd-qmatrix-btn.current {
  outline: 2px solid #d97706;
}

.hnd-btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--hnd-radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.hnd-btn-primary {
  background: var(--hnd-primary);
  color: #ffffff;
}

.hnd-btn-primary:hover {
  background: var(--hnd-primary-hover);
}

.hnd-btn-outline {
  background: #ffffff;
  
  color: var(--hnd-text-main);
}

/* Result Card */
.hnd-result-card {
  background: #ffffff;
  
  border-radius: var(--hnd-radius);
  padding: 3rem 2rem;
  text-align: center;
  margin-bottom: 2.5rem;
}

.hnd-result-badge {
  display: inline-block;
  font-size: 1.4rem;
  font-weight: 800;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

.hnd-result-badge.pass {
  background: #d1fae5;
  color: #065f46;
}

.hnd-result-badge.fail {
  background: #fee2e2;
  color: #991b1b;
}

.hnd-result-score {
  font-family: var(--hnd-font-title);
  font-size: 4rem;
  font-weight: 800;
  color: var(--hnd-text-main);
  line-height: 1;
  margin-bottom: 1rem;
}

/* ==========================================
   LiD APP MOBILE RESPONSIVE REDESIGN (<= 768px)
   ========================================== */
@media (max-width: 768px) {
  /* 1. App Container Padding & Margin */
  .hoinhapduc-container {
    padding: 0.85rem 0.65rem !important;
    margin: 0.5rem auto 1.5rem !important;
    border-radius: 14px !important;
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.05) !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  /* 2. App Header & Tab Bar (Swipeable Horizontal Pill Tabs) */
  .hnd-app-header {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.75rem !important;
    padding-bottom: 0.85rem !important;
    margin-bottom: 1rem !important;
    border-bottom: 1px solid var(--hnd-card-border) !important;
  }

  .hnd-app-logo {
    font-size: 1.15rem !important;
    text-align: center !important;
    margin: 0 auto !important;
  }

  .hnd-nav-tabs {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    width: 100% !important;
    background: #f1f5f9 !important;
    padding: 3px !important;
    border-radius: 12px !important;
    gap: 3px !important;
    box-sizing: border-box !important;
  }

  .hnd-tab-btn {
    flex: 1 0 auto !important;
    text-align: center !important;
    padding: 0.55rem 0.75rem !important;
    font-size: 0.82rem !important;
    white-space: nowrap !important;
    border-radius: 9px !important;
    min-height: 38px !important;
    box-sizing: border-box !important;
  }

  /* 3. Controls & Filter Bar */
  .hnd-controls-bar {
    padding: 0.75rem 0.65rem !important;
    margin-bottom: 1rem !important;
    border-radius: 12px !important;
    background: #f8fafc !important;
    border: 1px solid #e2e8f0 !important;
  }

  .hnd-filter-group {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.5rem !important;
  }

  .hnd-select-custom,
  .hnd-input-search {
    width: 100% !important;
    max-width: 100% !important;
    font-size: 16px !important; /* Prevents iOS auto-zoom */
    padding: 0.65rem 0.85rem !important;
    border-radius: 10px !important;
    box-sizing: border-box !important;
    min-height: 42px !important;
    border: 1px solid #cbd5e1 !important;
  }

  /* 4. Question Card Layout */
  .hnd-qcard {
    padding: 0.9rem 0.75rem !important;
    border-radius: 14px !important;
    margin-bottom: 1rem !important;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04) !important;
    border: 1px solid #e2e8f0 !important;
  }

  .hnd-qcard-header {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    margin-bottom: 0.85rem !important;
    padding-bottom: 0.6rem !important;
    gap: 0.5rem !important;
  }

  .hnd-qnum {
    font-size: 1rem !important;
  }

  .hnd-tag {
    font-size: 0.75rem !important;
    padding: 2px 8px !important;
  }

  .hnd-btn-translate {
    font-size: 0.78rem !important;
    padding: 0.35rem 0.75rem !important;
  }

  .hnd-qtitle-de {
    font-size: 1.05rem !important;
    line-height: 1.38 !important;
    margin-bottom: 0.65rem !important;
  }

  .hnd-qtitle-vi {
    font-size: 0.9rem !important;
    line-height: 1.45 !important;
    padding: 0.65rem 0.85rem !important;
    margin-bottom: 0.85rem !important;
    border-radius: 8px !important;
  }

  .hnd-qimages {
    padding: 0.75rem !important;
    gap: 0.75rem !important;
    justify-content: center !important;
    border-radius: 10px !important;
  }

  .hnd-qimage {
    max-height: 110px !important;
    max-width: 140px !important;
  }

  /* 5. Answer Options & Badges */
  .hnd-options-list {
    gap: 0.5rem !important;
    margin-bottom: 0.85rem !important;
  }

  .hnd-opt-item {
    padding: 0.65rem 0.75rem !important;
    border-radius: 10px !important;
    gap: 10px !important;
    min-height: 44px !important;
    align-items: center !important;
  }

  .hnd-opt-badge {
    width: 26px !important;
    height: 26px !important;
    font-size: 0.8rem !important;
  }

  .hnd-opt-de {
    font-size: 0.92rem !important;
    line-height: 1.35 !important;
  }

  .hnd-opt-vi {
    font-size: 0.82rem !important;
    padding: 2px 6px !important;
    margin-top: 3px !important;
  }

  .hnd-explanation-box {
    padding: 0.75rem 0.85rem !important;
    border-radius: 10px !important;
  }

  /* 6. Pagination Bar (Mobile 2-Row Layout) */
  .hnd-pagination-bar {
    padding: 0.75rem 0.65rem !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 0.6rem !important;
    align-items: center !important;
    text-align: center !important;
    margin: 1rem 0 !important;
    border-radius: 14px !important;
  }

  .hnd-page-info {
    font-size: 0.82rem !important;
    color: #64748b !important;
    margin-bottom: 0.15rem !important;
  }

  .hnd-page-actions {
    display: flex !important;
    flex-wrap: wrap !important;
    width: 100% !important;
    gap: 0.5rem !important;
    align-items: center !important;
    justify-content: space-between !important;
  }

  .hnd-select-page {
    order: 1 !important;
    width: 100% !important;
    max-width: 100% !important;
    text-align: center !important;
    text-align-last: center !important;
    font-size: 16px !important;
    font-weight: 700 !important;
    padding: 0.6rem 0.85rem !important;
    border-radius: 10px !important;
    border: 1.5px solid #cbd5e1 !important;
    background: #ffffff !important;
    color: #0f172a !important;
    min-height: 42px !important;
    box-sizing: border-box !important;
  }

  .hnd-btn-page {
    order: 2 !important;
    flex: 1 1 calc(50% - 0.25rem) !important;
    width: calc(50% - 0.25rem) !important;
    max-width: calc(50% - 0.25rem) !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0.65rem 0.5rem !important;
    font-size: 0.85rem !important;
    font-weight: 700 !important;
    white-space: nowrap !important;
    min-height: 42px !important;
    border-radius: 10px !important;
    box-sizing: border-box !important;
    margin: 0 !important;
  }

  /* 7. Exam Mode & Question Matrix */
  .hnd-exam-container {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  .hnd-timer-card {
    padding: 0.75rem !important;
    margin-bottom: 1rem !important;
    border-radius: 10px !important;
  }

  .hnd-timer-val {
    font-size: 1.8rem !important;
  }

  .hnd-qmatrix {
    grid-template-columns: repeat(7, 1fr) !important;
    gap: 5px !important;
    margin-bottom: 0.85rem !important;
  }

  .hnd-qmatrix-btn {
    padding: 0.45rem 0.2rem !important;
    font-size: 0.8rem !important;
    min-height: 36px !important;
    border-radius: 6px !important;
  }

  .hnd-result-card {
    padding: 1.75rem 1rem !important;
    border-radius: 14px !important;
    margin-bottom: 1.5rem !important;
  }

  .hnd-result-score {
    font-size: 2.75rem !important;
    margin-bottom: 0.75rem !important;
  }

  .hnd-result-badge {
    font-size: 1.1rem !important;
    padding: 0.5rem 1.25rem !important;
    margin-bottom: 1rem !important;
  }

  .hnd-btn {
    width: 100% !important;
    min-height: 44px !important;
    font-size: 0.92rem !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
  }
}