/* ============================================================
   Variables globales
   ============================================================ */
:root {
  --color-primary:   #1a6fb4;
  --color-primary-d: #155a94;
  --color-success:   #22a06b;
  --color-success-d: #1a8057;
  --color-danger:    #e5484d;
  --color-warning:   #f59e0b;
  --color-bg:        #f4f7fb;
  --color-surface:   #ffffff;
  --color-border:    #dde3ec;
  --color-text:      #1e2a3a;
  --color-muted:     #6b7a8d;
  --color-correct-bg:#d1fae5;
  --color-wrong-bg:  #fee2e2;
  --color-skip-bg:   #fef3c7;
  --radius:          12px;
  --radius-sm:       8px;
  --shadow:          0 2px 12px rgba(0,0,0,.08);
  --shadow-md:       0 4px 24px rgba(0,0,0,.12);
  --transition:      .18s ease;
  --font:            'Segoe UI', Tahoma, Arial, sans-serif;
  --max-w:           680px;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  direction: rtl;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

button { cursor: pointer; font-family: inherit; border: none; outline: none; }

/* ============================================================
   Screens
   ============================================================ */
.screen { display: none; min-height: 100vh; flex-direction: column; }
.screen.active { display: flex; }

/* ============================================================
   Utility
   ============================================================ */
.hidden { display: none !important; }

.error-box {
  background: #fff5f5;
  border: 1px solid #fca5a5;
  color: #b91c1c;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 20px;
  text-align: center;
  font-size: .95rem;
}

.loading-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px 20px;
  color: var(--color-muted);
}

.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  transition: background var(--transition), opacity var(--transition),
              transform var(--transition);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .45; pointer-events: none; }

.btn-primary   { background: var(--color-primary);   color: #fff; }
.btn-primary:hover { background: var(--color-primary-d); }

.btn-success   { background: var(--color-success);   color: #fff; }
.btn-success:hover { background: var(--color-success-d); }

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover { background: #eff6ff; }

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  font-weight: 500;
}
.btn-ghost:hover { background: #f0f0f0; color: var(--color-text); }

.btn-sm { padding: 8px 14px; font-size: .9rem; }

.btn-full { width: 100%; }

/* ============================================================
   Home Screen
   ============================================================ */
.app-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #2480d6 100%);
  color: #fff;
  text-align: center;
  padding: 40px 20px 32px;
}

.app-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -.5px;
}

.app-subtitle {
  font-size: 1rem;
  opacity: .88;
}

.exams-container {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 16px;
  width: 100%;
}

.exams-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 540px) {
  .exams-grid { grid-template-columns: 1fr 1fr; }
}

.exam-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.exam-card:hover, .exam-card:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  outline: none;
}

.exam-card:active { transform: scale(.98); }

.exam-card-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}

.exam-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text);
}

.exam-card-desc {
  font-size: .85rem;
  color: var(--color-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}

.exam-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.meta-tag {
  background: #eff6ff;
  color: var(--color-primary);
  font-size: .78rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
}

.app-footer {
  text-align: center;
  padding: 14px;
  font-size: .8rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   Exam Screen
   ============================================================ */
.exam-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 16px 8px;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 6px rgba(0,0,0,.06);
}

.exam-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.exam-header-title {
  font-size: 1rem;
  font-weight: 700;
  flex: 1;
  text-align: center;
  color: var(--color-text);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.timer-box {
  background: #fff7ed;
  border: 1px solid #fcd34d;
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  min-width: 70px;
  text-align: center;
}

.timer-box.urgent { background: #fee2e2; border-color: #fca5a5; }

#timer-display {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-warning);
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}

.timer-box.urgent #timer-display { color: var(--color-danger); }

.progress-bar-wrap {
  background: var(--color-bg);
  border-radius: 99px;
  height: 6px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), #2480d6);
  border-radius: 99px;
  transition: width .35s ease;
}

.progress-text {
  font-size: .82rem;
  color: var(--color-muted);
  text-align: center;
}

/* ── نقاط التنقل ───────────────────────────────────────────── */
.question-nav-wrap {
  overflow-x: auto;
  padding: 8px 16px 6px;
  scrollbar-width: none;
  background: var(--color-surface);
}
.question-nav-wrap::-webkit-scrollbar { display: none; }

.question-nav-list {
  display: flex;
  gap: 5px;
  min-width: max-content;
}

.q-dot {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  font-size: .72rem;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform .12s ease;
  -webkit-tap-highlight-color: transparent;
}
.q-dot:active { transform: scale(.9); }

.q-unanswered { background: #f1f5f9; color: var(--color-muted); border-color: var(--color-border); }
.q-answered   { background: #d1fae5; color: #065f46;            border-color: #6ee7b7; }
.q-current    { background: var(--color-primary); color: #fff;  border-color: var(--color-primary-d); }
.q-flagged    { background: #fff7ed; color: #92400e;            border-color: #fcd34d; }

/* Question */
.question-container {
  flex: 1;
  padding: 20px 16px 100px;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

.question-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.badge {
  font-size: .78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
}

.badge-category { background: #eff6ff; color: var(--color-primary); }

.badge-difficulty { background: #f0fdf4; color: var(--color-success); }

.badge-flagged { background: #fff7ed; color: #b45309; }

.question-text {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 20px;
}

/* Options */
.options-list { display: flex; flex-direction: column; gap: 10px; }

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: #f8fafc;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition),
              transform var(--transition);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.option-item:hover { border-color: var(--color-primary); background: #eff6ff; }
.option-item:active { transform: scale(.98); }

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

.option-radio {
  width: 20px; height: 20px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), background var(--transition);
}

.option-item.selected .option-radio {
  border-color: var(--color-primary);
  background: var(--color-primary);
}

.option-item.selected .option-radio::after {
  content: '';
  width: 8px; height: 8px;
  background: #fff;
  border-radius: 50%;
}

.option-text {
  font-size: .98rem;
  line-height: 1.55;
  color: var(--color-text);
}

/* Exam Footer */
.exam-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  z-index: 40;
  box-shadow: 0 -2px 10px rgba(0,0,0,.06);
}

/* ============================================================
   Result Screen
   ============================================================ */
.result-header {
  background: linear-gradient(135deg, #1a6fb4 0%, #2480d6 100%);
  color: #fff;
  text-align: center;
  padding: 36px 20px 28px;
}

.result-icon { font-size: 3rem; margin-bottom: 8px; }

.result-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.result-body {
  flex: 1;
  padding: 24px 16px;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

/* Score circle */
.score-circle-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.score-circle {
  width: 130px; height: 130px;
  border-radius: 50%;
  background: conic-gradient(var(--color-primary) var(--pct, 0%), #e5e7eb 0%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-md);
}

.score-circle::before {
  content: '';
  position: absolute;
  inset: 12px;
  background: var(--color-surface);
  border-radius: 50%;
}

.score-percent-val {
  position: relative;
  z-index: 1;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary);
  text-align: center;
  line-height: 1.2;
}

.score-detail {
  text-align: center;
  margin: -10px 0 14px;
}

.score-formula {
  display: inline-block;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 6px 14px;
  font-size: .88rem;
  color: var(--color-primary);
  direction: ltr;
}

.score-formula strong { color: var(--color-text); }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  box-shadow: var(--shadow);
}

.stat-correct { border-right: 4px solid var(--color-success); }
.stat-wrong   { border-right: 4px solid var(--color-danger);  }
.stat-skipped { border-right: 4px solid var(--color-warning); }
.stat-total   { border-right: 4px solid var(--color-primary); }

.stat-num   { font-size: 2rem; font-weight: 800; line-height: 1; }
.stat-label { font-size: .8rem; color: var(--color-muted); }

.stat-correct .stat-num { color: var(--color-success); }
.stat-wrong   .stat-num { color: var(--color-danger);  }
.stat-skipped .stat-num { color: var(--color-warning); }
.stat-total   .stat-num { color: var(--color-primary); }

/* Appreciation */
.appreciation-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  line-height: 1.6;
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Section correction intégrée dans le résultat */
.result-review-section {
  margin-top: 24px;
  border-top: 2px solid var(--color-border);
  padding-top: 20px;
}

.result-review-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  text-align: center;
}

.result-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

/* ============================================================
   Review Screen
   ============================================================ */
.review-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 6px rgba(0,0,0,.06);
}

.review-title {
  font-size: 1.1rem;
  font-weight: 700;
  flex: 1;
  text-align: center;
}

.review-filters {
  display: flex;
  gap: 8px;
  padding: 14px 16px 0;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}

.review-filters::-webkit-scrollbar { display: none; }

.filter-btn {
  padding: 7px 16px;
  border-radius: 99px;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: .88rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition);
  cursor: pointer;
}

.filter-btn.active, .filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: #eff6ff;
}

.review-list {
  padding: 14px 16px 90px;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Review card */
.review-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.review-card-header {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.review-card.correct .review-card-header { background: var(--color-correct-bg); }
.review-card.wrong   .review-card-header { background: var(--color-wrong-bg);   }
.review-card.skipped .review-card-header { background: var(--color-skip-bg);    }

.review-status-icon { font-size: 1.2rem; }

.review-q-num {
  font-size: .85rem;
  font-weight: 700;
  color: var(--color-muted);
}

.review-card-body { padding: 14px 16px; }

.review-question {
  font-size: .98rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.6;
}

.review-answers { display: flex; flex-direction: column; gap: 6px; }

.review-answer {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  line-height: 1.5;
}

.review-answer.chosen-correct {
  background: #d1fae5;
  border: 1px solid #6ee7b7;
}

.review-answer.chosen-wrong {
  background: #fee2e2;
  border: 1px solid #fca5a5;
}

.review-answer.correct-only {
  background: #d1fae5;
  border: 1px dashed #6ee7b7;
}

.review-answer-icon { flex-shrink: 0; font-size: 1rem; }

.review-explanation {
  margin-top: 10px;
  padding: 10px 12px;
  background: #f0f9ff;
  border-right: 3px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  color: var(--color-text);
  line-height: 1.6;
}

.review-explanation strong { display: block; margin-bottom: 4px; color: var(--color-primary); }

.review-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 12px 16px;
  display: flex;
  gap: 10px;
  z-index: 40;
  box-shadow: 0 -2px 10px rgba(0,0,0,.06);
}

.review-footer .btn { flex: 1; }

/* ============================================================
   Modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 28px 24px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-md);
  animation: modal-in .2s ease;
}

@keyframes modal-in {
  from { transform: scale(.92); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.modal-body {
  font-size: .95rem;
  color: var(--color-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.modal-actions .btn { min-width: 90px; }

/* ============================================================
   Toast
   ============================================================ */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e2a3a;
  color: #fff;
  padding: 10px 20px;
  border-radius: 99px;
  font-size: .9rem;
  z-index: 300;
  pointer-events: none;
  white-space: nowrap;
  animation: toast-in .2s ease;
}

@keyframes toast-in {
  from { opacity: 0; bottom: 60px; }
  to   { opacity: 1; bottom: 80px; }
}

/* ============================================================
   Responsive large screens
   ============================================================ */
@media (min-width: 700px) {
  .app-title { font-size: 2.1rem; }
  .question-text { font-size: 1.15rem; }
  .option-text { font-size: 1rem; }
  .stats-grid { grid-template-columns: 1fr 1fr 1fr 1fr; }
}