/* mcq_tester.css - Clean, Smooth & Elegant White Light Theme for MCQ Revision Lab */

:root {
  --desk-bg: #f3f4f6;
  --desk-grid: rgba(209, 213, 219, 0.6);
  --paper-bg: #fffdf8;
  --margin-line: rgba(239, 68, 68, 0.4);
  --note-line: rgba(59, 130, 246, 0.08);

  --bg-canvas: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #f8fafc;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #94a3b8;

  --primary-blue: #2563eb;
  --primary-blue-hover: #1d4ed8;
  --primary-blue-light: #eff6ff;
  --primary-blue-border: #bfdbfe;

  --success-green: #059669;
  --success-green-bg: #dcfce7;
  --success-green-border: #10b981;

  --danger-red: #dc2626;
  --danger-red-bg: #fee2e2;
  --danger-red-border: #ef4444;

  --warning-amber: #d97706;
  --warning-amber-bg: #fffbeb;
  --warning-amber-border: #fde68a;

  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.08);

  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, sans-serif;
}

/* Base Setup */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--desk-bg);
  background-image: radial-gradient(var(--desk-grid) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 15px;
  line-height: 1.6;
  margin: 0;
  padding: 0 1px;
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

.app-container {
  width: 100%;
  max-width: 100%;
  margin: 0;
}

/* Notebook Container & Paper Page */
.notebook-container {
  width: 100%;
  max-width: 100%;
}

.paper-page {
  position: relative;
  background-color: var(--paper-bg);
  background-image:
    linear-gradient(90deg, transparent 66px, var(--margin-line) 66px, var(--margin-line) 68px, transparent 68px),
    linear-gradient(var(--note-line) 96%, transparent 96%);
  background-size: 100% 100%, 100% 32px;
  background-position: 0 0, 0 12px;
  border-radius: var(--radius-lg);
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-light);
  padding: 36px 40px 36px 90px;
  min-height: 100vh;
  box-sizing: border-box;
}

/* Spiral Binding Binder Holes */
.paper-page::before {
  content: '';
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 20px;
  width: 14px;
  background-image: radial-gradient(circle, #374151 55%, transparent 63%);
  background-size: 14px 32px;
  background-repeat: repeat-y;
  background-position: 0 12px;
  opacity: 0.8;
  mix-blend-mode: multiply;
  z-index: 10;
}

/* Metal Spiral Rings */
.paper-page::after {
  content: '';
  position: absolute;
  top: 36px;
  bottom: 44px;
  left: 6px;
  width: 32px;
  background-image: linear-gradient(180deg,
      transparent 0px,
      transparent 4px,
      #9ca3af 4px,
      #e5e7eb 8px,
      #ffffff 10px,
      #d1d5db 12px,
      #4b5563 16px,
      transparent 16px,
      transparent 32px);
  background-size: 32px 32px;
  background-repeat: repeat-y;
  background-position: 0 12px;
  z-index: 11;
  filter: drop-shadow(2px 2px 3px rgba(0, 0, 0, 0.18));
}

/* Clean Header Navbar */
.view-header {
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 16px;
}

.view-title {
  font-family: var(--font-family);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.view-subtitle {
  font-size: 14.5px;
  color: var(--text-muted);
}

/* Dashboard View Panels */
.view-panel {
  display: none;
  width: 100%;
}

.view-panel.active {
  display: block;
  animation: fadeIn 0.25s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Catalog Section */
.catalog-section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

/* MCQ Subject Cards Grid Dashboard */
.mcq-subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 12px;
}

.mcq-subject-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 180px;
  box-shadow: var(--shadow-sm);
}

.mcq-subject-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary-blue-border);
  box-shadow: var(--shadow-lg);
  background: #ffffff;
}

.card-subject-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.card-subject-icon {
  font-size: 32px;
}

.card-subject-title {
  font-family: var(--font-family);
  font-size: 19px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
  line-height: 1.35;
}

.card-subject-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.45;
  margin-bottom: 16px;
}

.card-subject-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

.card-open-arrow {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Sub-nav Bar */
.sub-nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.sub-back-btn {
  font-family: var(--font-family);
  background: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-medium);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sub-back-btn:hover {
  background: #e2e8f0;
  color: var(--text-main);
}

.active-subject-badge {
  font-weight: 700;
  font-size: 13.5px;
  color: var(--primary-blue);
  background: var(--primary-blue-light);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--primary-blue-border);
}

/* Topic Modules List Rows */
.subject-topics-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: none !important;
  overflow: visible !important;
}

.topic-list-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.topic-list-row:hover {
  background: var(--primary-blue-light);
  border-color: var(--primary-blue-border);
  transform: translateX(4px);
}

.topic-info-side {
  flex: 1;
  padding-right: 16px;
}

.topic-row-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.topic-row-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.4;
}

.topic-badges-side {
  display: flex;
  align-items: center;
  gap: 10px;
}

.list-chevron {
  font-size: 18px;
  color: var(--text-subtle);
  font-weight: 300;
}

/* Badges */
.badge-pill {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
}

.badge-gray {
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.badge-blue {
  background: var(--primary-blue-light);
  color: var(--primary-blue);
  border: 1px solid var(--primary-blue-border);
}

.badge-amber {
  background: var(--warning-amber-bg);
  color: var(--warning-amber);
  border: 1px solid var(--warning-amber-border);
}

.badge-green {
  background: var(--success-green-bg);
  color: var(--success-green);
  border: 1px solid var(--success-green-border);
}

/* --- ACTIVE QUIZ PRACTICE VIEW --- */
.quiz-topbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 16px;
}

.action-link-btn.text-danger {
  background: #fef2f2;
  color: var(--danger-red);
  border: 1px solid var(--danger-red-border);
  border-radius: var(--radius-sm);
  padding: 7px 15px;
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.action-link-btn.text-danger:hover {
  background: var(--danger-red-bg);
}

/* Progress Bar */
.progress-wrapper {
  margin-bottom: 20px;
}

.progress-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.progress-track {
  height: 8px;
  background: var(--bg-subtle);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--primary-blue);
  width: 0%;
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

/* Navigation Jump Matrix */
.question-nav-matrix {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 4px 16px 4px;
  margin-bottom: 24px;
  scrollbar-width: thin;
}

.q-matrix-btn {
  min-width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border-medium);
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.q-matrix-btn:hover {
  border-color: var(--primary-blue);
  color: var(--primary-blue);
}

.q-matrix-btn.current {
  border-color: var(--primary-blue);
  background: var(--primary-blue);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.q-matrix-btn.correct-ans {
  background: var(--success-green-bg);
  color: var(--success-green);
  border-color: var(--success-green-border);
}

.q-matrix-btn.wrong-ans {
  background: var(--danger-red-bg);
  color: var(--danger-red);
  border-color: var(--danger-red-border);
}

/* Question Container */
.question-container {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.question-card-header {
  margin-bottom: 12px;
}

.q-badge {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary-blue);
  background: var(--primary-blue-light);
  padding: 3px 8px;
  border-radius: 4px;
}

.question-heading {
  font-size: 18.5px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.55;
  margin-bottom: 20px;
}

/* Hint Block */
.hint-wrapper {
  margin-bottom: 20px;
}

.hint-accordion-trigger {
  background: var(--warning-amber-bg);
  border: 1px solid var(--warning-amber-border);
  color: var(--warning-amber);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 600;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.hint-drawer {
  display: none;
  padding: 14px 16px;
  background: #fffbeb;
  border: 1px solid var(--warning-amber-border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-size: 14px;
  color: #78350f;
  line-height: 1.5;
}

.hint-wrapper.open .hint-drawer {
  display: block;
}

/* Options List */
.options-vertical-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.option-row-btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 15px;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.option-row-btn:hover:not(:disabled) {
  border-color: var(--primary-blue);
  background: var(--bg-hover);
  transform: translateX(2px);
}

.option-circle {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.option-text {
  flex: 1;
  line-height: 1.5;
}

/* Option Selected/Correct/Wrong States */
.option-row-btn.correct-choice {
  background: var(--success-green-bg);
  border-color: var(--success-green-border);
  color: #065f46;
}

.option-row-btn.correct-choice .option-circle {
  background: var(--success-green);
  color: #ffffff;
}

.option-row-btn.wrong-choice {
  background: var(--danger-red-bg);
  border-color: var(--danger-red-border);
  color: #991b1b;
}

.option-row-btn.wrong-choice .option-circle {
  background: var(--danger-red);
  color: #ffffff;
}

/* Explanation / Rationale Panel */
.explanation-panel {
  display: none;
  background: var(--success-green-bg);
  border: 1px solid var(--success-green-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-top: 20px;
  font-size: 14.5px;
  color: #065f46;
  line-height: 1.6;
}

.explanation-panel.wrong-explanation {
  background: #fff5f5;
  border-color: #fca5a5;
  color: #991b1b;
}

.explanation-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.result-badge {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
}

.result-badge.badge-success {
  background: var(--success-green);
  color: #ffffff;
}

.result-badge.badge-error {
  background: var(--danger-red);
  color: #ffffff;
}

/* Footer Controls */
.quiz-nav-footer, .quiz-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 28px;
  gap: 16px;
}

.secondary-btn, .btn-secondary, #prev-btn {
  padding: 12px 24px !important;
  border-radius: var(--radius-md) !important;
  font-family: var(--font-family) !important;
  font-weight: 600 !important;
  font-size: 14.5px !important;
  cursor: pointer !important;
  transition: all 0.2s ease !important;
  background: #ffffff !important;
  color: var(--text-main) !important;
  border: 1.5px solid var(--border-medium) !important;
  box-shadow: var(--shadow-sm) !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 8px !important;
  text-decoration: none !important;
}

.secondary-btn:hover:not(:disabled), .btn-secondary:hover:not(:disabled), #prev-btn:hover:not(:disabled) {
  background: var(--bg-subtle) !important;
  border-color: var(--primary-blue) !important;
  color: var(--primary-blue) !important;
  transform: translateX(-2px) !important;
}

.primary-btn, .btn-primary, #next-btn {
  padding: 12px 28px !important;
  border-radius: var(--radius-md) !important;
  font-family: var(--font-family) !important;
  font-weight: 700 !important;
  font-size: 14.5px !important;
  cursor: pointer !important;
  transition: all 0.2s ease !important;
  background: var(--primary-blue) !important;
  color: #ffffff !important;
  border: none !important;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25) !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 8px !important;
  text-decoration: none !important;
}

.primary-btn:hover:not(:disabled), .btn-primary:hover:not(:disabled), #next-btn:hover:not(:disabled) {
  background: var(--primary-blue-hover) !important;
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35) !important;
  transform: translateY(-2px) !important;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Rich HTML Content & Table Formatting Support */
.question-heading table, .explanation-panel table, .hint-drawer table, .options-vertical-list table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 14px;
  font-family: var(--font-family);
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.question-heading th, .question-heading td,
.explanation-panel th, .explanation-panel td,
.hint-drawer th, .hint-drawer td,
.options-vertical-list th, .options-vertical-list td {
  border: 1px solid var(--border-medium);
  padding: 8px 12px;
  text-align: left;
}

.question-heading th, .explanation-panel th {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  font-weight: 700;
}

.question-heading tr:nth-child(even), .explanation-panel tr:nth-child(even) {
  background-color: var(--bg-canvas);
}

/* Results Dashboard */
.results-card-container {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.results-header-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 20px;
}

@media (max-width: 640px) {
  body {
    padding: 0 !important;
    margin: 0 !important;
  }
  .notebook-container {
    padding: 0 !important;
  }
  .paper-page {
    padding: 24px 10px;
    background-image: linear-gradient(var(--note-line) 96%, transparent 96%);
    background-size: 100% 32px;
    background-position: 0 12px;
    border-radius: 0 !important;
    border: none !important;
  }
  .paper-page::before,
  .paper-page::after {
    display: none !important;
  }
  .mcq-subjects-grid {
    grid-template-columns: 1fr;
  }
  .sub-nav-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}