/* ==========================================================================
   Driving Quiz Pro - Modern, Theme-Proof Stylesheet
   Tối ưu hiển thị độc lập trên mọi giao diện WordPress (Gutenberg, Classic, Page Builders)
   ========================================================================== */

:root {
  --dq-primary: #0284c7;
  --dq-primary-hover: #0369a1;
  --dq-primary-light: #e0f2fe;
  --dq-primary-dark: #075985;
  
  --dq-accent: #f59e0b;
  --dq-accent-hover: #d97706;
  --dq-accent-light: #fef3c7;
  
  --dq-success: #10b981;
  --dq-success-dark: #059669;
  --dq-success-light: #d1fae5;
  
  --dq-danger: #ef4444;
  --dq-danger-dark: #dc2626;
  --dq-danger-light: #fee2e2;

  --dq-bg: #f8fafc;
  --dq-card-bg: #ffffff;
  --dq-text-main: #0f172a;
  --dq-text-muted: #64748b;
  --dq-text-sub: #475569;
  --dq-border: #e2e8f0;
  --dq-border-subtle: #cbd5e1;

  --dq-font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --dq-radius-sm: 6px;
  --dq-radius-md: 10px;
  --dq-radius-lg: 16px;
  --dq-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --dq-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --dq-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

/* Theme Isolation & CSS Reset for DQ Container */
.dq-exam-container,
.dq-exam-container * {
  box-sizing: border-box !important;
  font-family: var(--dq-font) !important;
}

.dq-exam-container {
  max-width: 1060px;
  margin: 25px auto;
  padding: 0 10px;
  color: var(--dq-text-main);
  line-height: 1.6;
}

.dq-exam-container p {
  margin: 0 0 10px;
}

/* ==========================================================================
   BUTTONS & COMMON UI
   ========================================================================== */
.dq-btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff !important;
  border: none;
  padding: 10px 20px;
  border-radius: var(--dq-radius-sm);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
  text-decoration: none !important;
}

.dq-btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(2, 132, 199, 0.35);
}

.dq-btn-secondary {
  background: #f1f5f9;
  color: var(--dq-text-main) !important;
  border: 1px solid var(--dq-border-subtle);
  padding: 10px 18px;
  border-radius: var(--dq-radius-sm);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s ease;
  text-decoration: none !important;
}

.dq-btn-secondary:hover {
  background: #e2e8f0;
  border-color: #94a3b8;
}

.dq-btn-outline-sm {
  background: transparent;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.6);
  padding: 5px 12px;
  border-radius: var(--dq-radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.dq-btn-outline-sm:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #ffffff;
}

.dq-btn-lg {
  padding: 14px 28px;
  font-size: 17px;
}

.dq-btn-block {
  width: 100%;
  display: block;
  margin-top: 15px;
}

.dq-select {
  padding: 9px 12px;
  border: 1px solid var(--dq-border-subtle);
  border-radius: var(--dq-radius-sm);
  font-size: 14px;
  background: #ffffff;
  color: var(--dq-text-main);
  outline: none;
}

.dq-select:focus {
  border-color: var(--dq-primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

/* ==========================================================================
   LOBBY SCREEN (CHỌN HẠNG TRỰC QUAN IN-PAGE)
   ========================================================================== */
.dq-lobby-screen {
  background: #ffffff;
  border: 1px solid var(--dq-border);
  border-radius: var(--dq-radius-lg);
  box-shadow: var(--dq-shadow-md);
  padding: 35px 30px;
  margin-bottom: 25px;
}

.dq-lobby-header {
  text-align: center;
  margin-bottom: 30px;
}

.dq-lobby-badge {
  display: inline-block;
  background: var(--dq-primary-light);
  color: var(--dq-primary-dark);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.dq-lobby-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--dq-text-main);
  margin: 0 0 8px;
  line-height: 1.3;
}

.dq-lobby-subtitle {
  color: var(--dq-text-muted);
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto;
}

.dq-lobby-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.dq-type-card {
  background: #ffffff;
  border: 2px solid var(--dq-border);
  border-radius: var(--dq-radius-md);
  padding: 18px;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.dq-type-card:hover {
  border-color: #93c5fd;
  transform: translateY(-2px);
  box-shadow: var(--dq-shadow-sm);
}

.dq-type-card.active {
  border-color: var(--dq-primary);
  background: #f0f9ff;
  box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.2);
}

.dq-type-card.active::after {
  content: "✓";
  position: absolute;
  top: 10px;
  right: 12px;
  background: var(--dq-primary);
  color: #ffffff;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dq-type-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.dq-type-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--dq-text-main);
  margin-bottom: 4px;
}

.dq-type-desc {
  font-size: 13px;
  color: var(--dq-text-muted);
  margin-bottom: 12px;
  flex-grow: 1;
}

.dq-type-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--dq-text-sub);
  background: #ffffff;
  padding: 8px 10px;
  border-radius: var(--dq-radius-sm);
  border: 1px solid var(--dq-border);
}

.dq-lobby-action {
  text-align: center;
}

.dq-lobby-note {
  margin-top: 15px;
  font-size: 13px;
  color: #b45309;
  background: #fffbeb;
  padding: 10px 16px;
  border-radius: var(--dq-radius-sm);
  display: inline-block;
  border: 1px solid #fef3c7;
}

/* ==========================================================================
   EXAM UI & BODY
   ========================================================================== */
.dq-exam-ui {
  background: #f8fafc;
  border: 1px solid var(--dq-border);
  border-radius: var(--dq-radius-md);
  overflow: hidden;
  box-shadow: var(--dq-shadow-md);
}

.dq-topbar {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.dq-topbar-practice {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
}

.dq-exam-info-tag {
  font-size: 15px;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.2);
  padding: 4px 12px;
  border-radius: 50px;
}

.dq-timer-bar {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

#dq-timer {
  font-size: 18px;
  background: #0f172a;
  color: #38bdf8;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace !important;
}

.dq-topbar-title {
  font-size: 17px;
  font-weight: 700;
}

.dq-exam-body {
  display: flex;
  gap: 20px;
  padding: 20px;
}

/* Left Grid Sidebar */
.dq-exam-left {
  width: 280px;
  flex-shrink: 0;
  background: #ffffff;
  padding: 16px;
  border-radius: var(--dq-radius-sm);
  border: 1px solid var(--dq-border);
}

.dq-left-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--dq-text-muted);
  text-transform: uppercase;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.dq-left-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  max-height: 420px;
  overflow-y: auto;
  padding-right: 4px;
}

.dq-left-grid::-webkit-scrollbar {
  width: 5px;
}
.dq-left-grid::-webkit-scrollbar-track {
  background: #f1f5f9;
}
.dq-left-grid::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

.dq-grid-item {
  height: 38px;
  border-radius: var(--dq-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--dq-border-subtle);
  color: var(--dq-text-main);
  background: #ffffff;
  user-select: none;
  position: relative;
  transition: all 0.15s ease;
}

.dq-grid-item:hover {
  border-color: var(--dq-primary);
  background: var(--dq-primary-light);
  color: var(--dq-primary-dark);
}

.dq-grid-item.active {
  background: var(--dq-primary) !important;
  color: #ffffff !important;
  border-color: var(--dq-primary-dark) !important;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.4);
}

.dq-grid-item.answered {
  background: #e2e8f0;
  color: #334155;
  border-color: #94a3b8;
}

.dq-grid-item.correct {
  background: var(--dq-success) !important;
  color: #ffffff !important;
  border-color: var(--dq-success-dark) !important;
}

.dq-grid-item.wrong {
  background: var(--dq-danger) !important;
  color: #ffffff !important;
  border-color: var(--dq-danger-dark) !important;
}

.dq-killer-star {
  color: #ef4444;
  font-weight: 900;
  position: absolute;
  top: -2px;
  right: 3px;
  font-size: 14px;
}

/* Right Question Panel */
.dq-exam-right {
  flex: 1;
  min-width: 0;
  background: #ffffff;
  border-radius: var(--dq-radius-sm);
  border: 1px solid var(--dq-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.dq-question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--dq-border);
  margin-bottom: 15px;
}

.dq-question-nav.bottom-nav {
  margin-top: 25px;
  margin-bottom: 0;
  padding-top: 15px;
  padding-bottom: 0;
  border-top: 1px solid var(--dq-border);
  border-bottom: none;
}

.dq-current-indicator {
  font-size: 14px;
  font-weight: 700;
  color: var(--dq-text-muted);
}

.dq-btn-nav {
  background: #f1f5f9;
  color: var(--dq-text-main);
  border: 1px solid var(--dq-border-subtle);
  padding: 8px 16px;
  border-radius: var(--dq-radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.dq-btn-nav:hover:not(:disabled) {
  background: #e2e8f0;
  border-color: #94a3b8;
}

.dq-btn-nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.dq-card-exam {
  flex-grow: 1;
}

.dq-question-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--dq-text-main);
  line-height: 1.5;
  margin-bottom: 18px;
}

.dq-q-number {
  color: var(--dq-primary);
  font-size: 20px;
  margin-right: 4px;
}

.dq-killer-badge {
  background: #dc2626;
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: 4px;
  vertical-align: middle;
  margin-left: 8px;
}

.dq-image-wrap {
  margin: 15px 0;
  text-align: center;
}

.dq-image-wrap img {
  max-width: 100%;
  height: auto;
  max-height: 280px;
  border: 1px solid var(--dq-border);
  border-radius: var(--dq-radius-sm);
  box-shadow: var(--dq-shadow-sm);
}

.dq-answers {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 15px;
}

.dq-answer {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border-radius: var(--dq-radius-sm);
  border: 1.5px solid var(--dq-border);
  background: #f8fafc;
  cursor: pointer;
  transition: all 0.2s ease;
}

.dq-answer:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.dq-answer-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #e2e8f0;
  color: var(--dq-text-main);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.dq-answer-text {
  font-size: 15px;
  color: var(--dq-text-main);
  line-height: 1.4;
}

.dq-answer.picked {
  background: #e0f2fe;
  border-color: #38bdf8;
}

.dq-answer.picked .dq-answer-badge {
  background: var(--dq-primary);
  color: #ffffff;
}

.dq-answer.correct {
  background: #ecfdf5;
  border-color: var(--dq-success);
}

.dq-answer.correct .dq-answer-badge {
  background: var(--dq-success);
  color: #ffffff;
}

.dq-answer.wrong {
  background: #fef2f2;
  border-color: var(--dq-danger);
}

.dq-answer.wrong .dq-answer-badge {
  background: var(--dq-danger);
  color: #ffffff;
}

.dq-explain {
  margin-top: 20px;
  padding: 16px 20px;
  background: #eff6ff;
  border-left: 4px solid var(--dq-primary);
  border-radius: 0 var(--dq-radius-sm) var(--dq-radius-sm) 0;
}

.dq-explain-title {
  font-weight: 700;
  color: var(--dq-primary-dark);
  margin-bottom: 6px;
  font-size: 14px;
}

.dq-explain-body {
  font-size: 14px;
  color: #1e3a8a;
  line-height: 1.6;
}

/* ==========================================================================
   RESULT SCREEN
   ========================================================================== */
.dq-result-screen {
  background: #ffffff;
  border: 1px solid var(--dq-border);
  border-radius: var(--dq-radius-lg);
  overflow: hidden;
  box-shadow: var(--dq-shadow-md);
}

.dq-result-header {
  padding: 30px 20px;
  text-align: center;
  color: #ffffff;
}

.dq-result-header.passed {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.dq-result-header.failed {
  background: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
}

.dq-result-icon {
  font-size: 48px;
  margin-bottom: 10px;
}

.dq-result-header h2 {
  font-size: 24px;
  font-weight: 800;
  margin: 0 0 6px;
  color: #ffffff !important;
}

.dq-verdict-sub {
  font-size: 15px;
  opacity: 0.95;
  max-width: 550px;
  margin: 0 auto;
}

.dq-result-content {
  padding: 30px 25px;
}

.dq-stat-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin-bottom: 30px;
}

.dq-stat-card {
  background: #f8fafc;
  border: 1px solid var(--dq-border);
  border-radius: var(--dq-radius-md);
  padding: 18px 10px;
  text-align: center;
}

.dq-stat-val {
  font-size: 22px;
  font-weight: 800;
  color: var(--dq-text-main);
  margin-bottom: 4px;
}

.dq-stat-lbl {
  font-size: 13px;
  color: var(--dq-text-muted);
  font-weight: 600;
}

.dq-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ==========================================================================
   PRACTICE MODE CONTROLS
   ========================================================================== */
.dq-practice-controls {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dq-filter-row {
  display: flex;
  gap: 8px;
}

.dq-filter-select {
  flex: 1;
}

.dq-input-search {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--dq-border-subtle);
  border-radius: var(--dq-radius-sm);
  font-size: 14px;
  outline: none;
  background: #ffffff;
}

.dq-input-search:focus {
  border-color: var(--dq-accent);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
}

.dq-practice-controls .dq-btn-outline-sm {
  color: var(--dq-danger) !important;
  border-color: var(--dq-danger-light);
  background: var(--dq-danger-light);
}

.dq-practice-controls .dq-btn-outline-sm:hover {
  background: var(--dq-danger);
  color: #ffffff !important;
}

/* ==========================================================================
   LOADER & FLOATING MOBILE NAV
   ========================================================================== */
.dq-loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  font-size: 16px;
  font-weight: 700;
  color: var(--dq-primary);
  backdrop-filter: blur(4px);
}

.dq-spinner {
  width: 44px;
  height: 44px;
  border: 4px solid #e2e8f0;
  border-top: 4px solid var(--dq-primary);
  border-radius: 50%;
  animation: dq-spin 0.8s linear infinite;
  margin-bottom: 12px;
}

@keyframes dq-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.dq-nav-mobile {
  display: none;
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (MOBILE / TABLET)
   ========================================================================== */
@media (max-width: 860px) {
  .dq-exam-body {
    flex-direction: column;
    padding: 15px;
  }

  .dq-exam-left {
    width: 100%;
  }

  .dq-left-grid {
    display: flex;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 10px;
  }

  .dq-grid-item {
    flex: 0 0 38px;
    height: 38px;
    min-width: 38px;
  }

  .dq-exam-right {
    padding: 16px;
  }

  .dq-stat-cards {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .dq-result-actions {
    flex-direction: column;
  }

  .dq-result-actions button {
    width: 100%;
  }

  .dq-topbar {
    padding: 10px 14px;
  }

  .dq-nav-mobile {
    display: flex;
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(15, 23, 42, 0.85);
    color: #ffffff;
    border: none;
    font-size: 22px;
    font-weight: 700;
    z-index: 999;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: var(--dq-shadow-md);
  }

  .dq-nav-left {
    left: 8px;
  }

  .dq-nav-right {
    right: 8px;
  }
}