/* Productive Quiz - Public Frontend Styles */

:root {
    --pq-primary: #4f46e5;
    --pq-primary-hover: #4338ca;
    --pq-secondary: #6b7280;
    --pq-success: #10b981;
    --pq-danger: #ef4444;
    --pq-warning: #f59e0b;
    --pq-info: #3b82f6;
    --pq-light: #f3f4f6;
    --pq-dark: #1f2937;
    --pq-border: #e5e7eb;
    --pq-text: #374151;
    --pq-text-muted: #9ca3af;
    --pq-bg: #f9fafb;
    --pq-white: #ffffff;
    --pq-radius: 12px;
    --pq-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --pq-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

/* Buttons */
.kar-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; font-size: 15px; font-weight: 600; border-radius: var(--pq-radius); border: none; cursor: pointer; text-decoration: none; transition: all 0.3s ease; font-family: inherit; }
.kar-btn-primary { background: linear-gradient(135deg, var(--pq-primary) 0%, #6366f1 100%); color: white; box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4); }
.kar-btn-primary:hover { background: linear-gradient(135deg, var(--pq-primary-hover) 0%, #4f46e5 100%); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5); color: white; }
.kar-btn-secondary { background: var(--pq-secondary); color: white; }
.kar-btn-secondary:hover { background: #4b5563; color: white; }
.kar-btn-success { background: linear-gradient(135deg, var(--pq-success) 0%, #34d399 100%); color: white; box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4); }
.kar-btn-success:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5); color: white; }
.kar-btn-lg { padding: 16px 32px; font-size: 17px; }
.kar-btn-sm { padding: 8px 16px; font-size: 13px; }
.kar-btn-full { width: 100%; }

/* Grid System */
.kar-quizzes-grid, .kar-qb-categories-grid, .kar-qb-cards-grid, .kar-subjects-grid { display: grid; gap: 24px; }
.kar-grid-3 { grid-template-columns: repeat(3, 1fr); }
.kar-grid-2 { grid-template-columns: repeat(2, 1fr); }
.kar-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .kar-grid-3, .kar-grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .kar-grid-2, .kar-grid-3, .kar-grid-4 { grid-template-columns: 1fr; } }

/* Quiz/Exam Cards */
.kar-quiz-card, .kar-qb-card { background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow); overflow: hidden; transition: all 0.3s ease; }
.kar-quiz-card:hover, .kar-qb-card:hover { transform: translateY(-4px); box-shadow: var(--pq-shadow-lg); }
.kar-card-image-wrap { position: relative; }
.kar-card-badge { position: absolute; top: 12px; right: 12px; padding: 5px 12px; background: rgba(79, 70, 229, 0.9); color: white; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; border-radius: 6px; z-index: 2; box-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.kar-card-image { height: 180px; overflow: hidden; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.kar-card-image img { width: 100%; height: 100%; object-fit: cover; }
.kar-default-image { display: flex; align-items: center; justify-content: center; }
.kar-quiz-icon { font-size: 48px; }
.kar-card-content { padding: 20px; }
.kar-card-title { font-size: 18px; font-weight: 700; color: var(--pq-dark); margin: 0 0 8px 0; }
.kar-card-desc { font-size: 14px; color: var(--pq-text-muted); margin: 0 0 16px 0; line-height: 1.5; }
.kar-card-meta { display: flex; gap: 16px; margin-bottom: 16px; font-size: 13px; color: var(--pq-text-muted); }

/* Category Cards */
.kar-category-card { display: block; background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow); padding: 30px; text-align: center; text-decoration: none; transition: all 0.3s ease; }
.kar-category-card:hover { transform: translateY(-4px); box-shadow: var(--pq-shadow-lg); }
.kar-category-icon { font-size: 48px; margin-bottom: 16px; }
.kar-category-name { font-size: 18px; font-weight: 700; color: var(--pq-dark); margin: 0 0 8px 0; }
.kar-category-count { font-size: 14px; color: var(--pq-primary); font-weight: 500; }
.kar-category-desc { font-size: 13px; color: var(--pq-text-muted); margin: 12px 0 0 0; }

/* Pagination */
.kar-pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin-top: 32px; flex-wrap: wrap; }
.kar-page-link { display: inline-flex; align-items: center; justify-content: center; min-width: 40px; height: 40px; padding: 0 12px; background: var(--pq-white); border: 2px solid var(--pq-border); border-radius: 8px; color: var(--pq-text); font-size: 14px; font-weight: 500; text-decoration: none; transition: all 0.2s; }
.kar-page-link:hover { border-color: var(--pq-primary); color: var(--pq-primary); }
.kar-page-link.kar-page-active { background: var(--pq-primary); border-color: var(--pq-primary); color: white; }
.kar-page-dots { color: var(--pq-text-muted); padding: 0 8px; }
.kar-page-prev, .kar-page-next { font-weight: 600; }

/* Pagination Controls */
.kar-pagination-controls { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; padding: 16px 20px; background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow); flex-wrap: wrap; gap: 16px; }
.kar-per-page-selector { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--pq-text); }
.kar-per-page-selector select { padding: 8px 12px; border: 2px solid var(--pq-border); border-radius: 8px; font-size: 14px; font-weight: 500; background: var(--pq-white); cursor: pointer; transition: border-color 0.2s; }
.kar-per-page-selector select:focus { outline: none; border-color: var(--pq-primary); }
.kar-page-info { font-size: 14px; color: var(--pq-text-muted); font-weight: 500; }

/* Breadcrumb */
.kar-breadcrumb { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; font-size: 14px; }
.kar-breadcrumb a { color: var(--pq-primary); text-decoration: none; }
.kar-breadcrumb a:hover { text-decoration: underline; }
.kar-breadcrumb-sep { color: var(--pq-text-muted); }

/* Page Header */
.kar-page-header { margin-bottom: 30px; }
.kar-page-title { font-size: 28px; font-weight: 700; color: var(--pq-dark); margin: 0 0 8px 0; }
.kar-page-desc { font-size: 16px; color: var(--pq-text-muted); margin: 0; }

/* No Items */
.kar-no-items, .kar-error { text-align: center; padding: 60px 20px; color: var(--pq-text-muted); font-size: 16px; }

/* Quiz Container */
.kar-quiz-container { max-width: 800px; margin: 0 auto; }
.kar-quiz-home-bar { margin-bottom: 16px; }
.kar-result-home-bar { margin-top: 32px; text-align: center; }

/* Registration Form */
.kar-quiz-register { display: flex; justify-content: center; padding: 40px 20px; }
.kar-register-card { background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow-lg); padding: 40px; max-width: 500px; width: 100%; text-align: center; }
.kar-register-icon { font-size: 64px; margin-bottom: 20px; }
.kar-register-card h2 { font-size: 24px; font-weight: 700; color: var(--pq-dark); margin: 0 0 12px 0; }
.kar-quiz-desc { font-size: 15px; color: var(--pq-text-muted); margin: 0 0 20px 0; line-height: 1.6; }
.kar-quiz-info-bar { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.kar-info-pill { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; background: var(--pq-light); border-radius: 20px; font-size: 13px; color: var(--pq-text); }

/* Register Form */
.kar-register-form { text-align: left; }
.kar-form-group { margin-bottom: 20px; }
.kar-form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--pq-dark); margin-bottom: 8px; }
.kar-required { color: var(--pq-danger); }
.kar-optional { color: var(--pq-text-muted); font-weight: 400; font-size: 13px; }
.kar-form-group input { width: 100%; padding: 14px 16px; font-size: 15px; border: 2px solid var(--pq-border); border-radius: var(--pq-radius); transition: border-color 0.2s; box-sizing: border-box; }
.kar-form-group input:focus { outline: none; border-color: var(--pq-primary); }

/* Quiz Questions */
.kar-quiz-questions { background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow-lg); padding: 30px; }
.kar-quiz-header { margin-bottom: 30px; }
.kar-quiz-header-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.kar-quiz-running-title { font-size: 20px; font-weight: 700; color: var(--pq-dark); margin: 0; }
.kar-timer { display: flex; align-items: center; gap: 8px; padding: 10px 16px; background: var(--pq-light); border-radius: var(--pq-radius); font-size: 18px; font-weight: 700; color: var(--pq-dark); }
.kar-timer.kar-timer-warning { background: #fef3c7; color: #92400e; }
.kar-timer.kar-timer-danger { background: #fee2e2; color: #991b1b; animation: pulse 1s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.7; } }

/* Progress */
.kar-progress-wrap { margin-bottom: 10px; }
.kar-progress { height: 8px; background: var(--pq-light); border-radius: 4px; overflow: hidden; margin-bottom: 8px; }
.kar-progress-bar { height: 100%; background: linear-gradient(90deg, var(--pq-primary) 0%, #818cf8 100%); border-radius: 4px; transition: width 0.3s ease; }
.kar-progress-text { font-size: 14px; color: var(--pq-text-muted); }
.kar-current-q, .kar-total-q { font-weight: 600; color: var(--pq-dark); }

/* Question Slide */
.kar-question-slide { margin-bottom: 30px; }
.kar-question-wrap { padding: 20px 0; }
.kar-question-number { font-size: 14px; color: var(--pq-text-muted); margin-bottom: 12px; font-weight: 500; }
.kar-question-title { font-size: 18px; font-weight: 600; color: var(--pq-dark); margin-bottom: 20px; line-height: 1.6; }
.kar-question-image { margin-bottom: 20px; }
.kar-question-image img { max-width: 100%; border-radius: var(--pq-radius); }

/* Options */
.kar-options-list { display: flex; flex-direction: column; gap: 12px; }
.kar-option-item { display: flex; align-items: center; gap: 14px; padding: 16px 20px; background: var(--pq-light); border: 2px solid transparent; border-radius: var(--pq-radius); cursor: pointer; transition: all 0.2s; }
.kar-option-item:hover { background: #e5e7eb; }
.kar-option-item.kar-selected { background: #eff6ff; border-color: var(--pq-primary); }
.kar-option-item input[type="radio"] { display: none; }
.kar-option-label { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; background: var(--pq-white); border-radius: 50%; font-weight: 700; font-size: 14px; color: var(--pq-text); flex-shrink: 0; }
.kar-selected .kar-option-label { background: var(--pq-primary); color: white; }
.kar-option-text { flex: 1; font-size: 15px; color: var(--pq-text); }

/* Navigation */
.kar-quiz-navigation { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; border-top: 1px solid var(--pq-border); }

/* Results */
.kar-quiz-results { background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow-lg); padding: 40px; text-align: center; }
.kar-result-header { margin-bottom: 30px; }
.kar-result-icon { font-size: 72px; margin-bottom: 16px; }
.kar-result-title { font-size: 28px; font-weight: 700; color: var(--pq-dark); margin: 0 0 8px 0; }
.kar-result-subtitle { font-size: 16px; color: var(--pq-text-muted); margin: 0; }
.kar-result-score-box { background: linear-gradient(135deg, var(--pq-primary) 0%, #818cf8 100%); border-radius: var(--pq-radius); padding: 30px; margin-bottom: 30px; }
.kar-result-score { font-size: 64px; font-weight: 800; color: white; margin: 0; }
.kar-result-marks { font-size: 18px; color: rgba(255,255,255,0.9); margin: 8px 0 0 0; }
.kar-result-passed { background: linear-gradient(135deg, var(--pq-success) 0%, #34d399 100%); }
.kar-result-failed { background: linear-gradient(135deg, var(--pq-danger) 0%, #f87171 100%); }
.kar-result-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 30px; }
.kar-result-stat { padding: 20px; background: var(--pq-light); border-radius: var(--pq-radius); }
.kar-result-stat-number { font-size: 32px; font-weight: 700; }
.kar-result-stat-label { font-size: 14px; color: var(--pq-text-muted); }
.kar-stat-correct .kar-result-stat-number { color: var(--pq-success); }
.kar-stat-wrong .kar-result-stat-number { color: var(--pq-danger); }
.kar-stat-skipped .kar-result-stat-number { color: var(--pq-warning); }

/* Result Review */
.kar-result-review { text-align: left; margin-top: 30px; }
.kar-result-review h3 { font-size: 20px; font-weight: 700; color: var(--pq-dark); margin: 0 0 20px 0; }
.kar-review-item { background: var(--pq-light); border-radius: var(--pq-radius); padding: 20px; margin-bottom: 16px; }
.kar-review-item.kar-review-correct { background: #d1fae5; border-left: 4px solid var(--pq-success); }
.kar-review-item.kar-review-wrong { background: #fee2e2; border-left: 4px solid var(--pq-danger); }
.kar-review-item.kar-review-skipped { background: #fef3c7; border-left: 4px solid var(--pq-warning); }
.kar-review-question { font-weight: 600; color: var(--pq-dark); margin-bottom: 12px; }
.kar-review-answer { font-size: 14px; color: var(--pq-text); margin-bottom: 4px; }
.kar-review-explanation { background: rgba(255,255,255,0.5); padding: 12px; border-radius: 8px; margin-top: 12px; font-size: 14px; color: var(--pq-text); }
.kar-review-options { display: flex; flex-direction: column; gap: 8px; margin: 12px 0; }
.kar-review-opt { display: flex; align-items: center; gap: 12px; padding: 10px 14px; background: var(--pq-light); border-radius: 8px; border: 2px solid transparent; font-size: 14px; }
.kar-review-opt-correct { background: #d1fae5; border-color: #10b981; }
.kar-review-opt-wrong { background: #fee2e2; border-color: #ef4444; }
.kar-ro-key { min-width: 24px; font-weight: 700; font-size: 14px; flex-shrink: 0; color: var(--pq-text); }
.kar-review-opt-correct .kar-ro-key { color: var(--pq-success); }
.kar-review-opt-wrong .kar-ro-key { color: var(--pq-danger); }
.kar-ro-text { flex: 1; color: var(--pq-text); }
.kar-ro-badge { font-size: 12px; font-weight: 600; white-space: nowrap; }
.kar-ro-badge-correct { color: var(--pq-success); }
.kar-ro-badge-wrong { color: var(--pq-danger); }
.kar-review-skipped-note { color: var(--pq-warning); font-size: 14px; margin-top: 4px; }

/* Question Bank Study View */
.kar-qb-header-card { background: linear-gradient(135deg, var(--pq-primary) 0%, #818cf8 100%); border-radius: var(--pq-radius); padding: 30px; margin-bottom: 24px; color: white; display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 20px; }
.kar-qb-title { font-size: 28px; font-weight: 700; margin: 0 0 10px 0; }
.kar-qb-desc { font-size: 15px; opacity: 0.9; margin: 0 0 16px 0; max-width: 600px; }
.kar-qb-meta-bar { display: flex; gap: 12px; flex-wrap: wrap; }
.kar-meta-pill { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; background: rgba(255,255,255,0.2); border-radius: 20px; font-size: 13px; }
.kar-btn-show-answers { background: rgba(255,255,255,0.2); color: white; border: none; }
.kar-btn-show-answers:hover { background: rgba(255,255,255,0.3); color: white; }

/* Subject Filters */
.kar-qb-subject-filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px; }
.kar-subject-btn { padding: 10px 18px; background: var(--pq-white); border: 2px solid var(--pq-border); border-radius: 25px; font-size: 14px; font-weight: 500; color: var(--pq-text); cursor: pointer; transition: all 0.2s; }
.kar-subject-btn:hover { border-color: var(--pq-primary); color: var(--pq-primary); }
.kar-subject-btn.kar-subject-active { background: var(--pq-primary); border-color: var(--pq-primary); color: white; }

/* Question Bank Question Item */
.kar-qb-question-item { background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow); margin-bottom: 16px; overflow: hidden; padding: 20px; }
.kar-qb-q-header { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 16px; }
.kar-qb-q-number { background: var(--pq-primary); color: white; padding: 4px 10px; border-radius: 6px; font-size: 12px; font-weight: 700; flex-shrink: 0; }
.kar-qb-q-title { font-size: 16px; color: var(--pq-dark); line-height: 1.6; flex: 1; }
.kar-qb-eye-btn { width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; background: var(--pq-light); border: 2px solid var(--pq-border); border-radius: 50%; cursor: pointer; flex-shrink: 0; color: var(--pq-text-muted); transition: all 0.2s; }
.kar-qb-eye-btn:hover { background: #dbeafe; border-color: var(--pq-primary); color: var(--pq-primary); }
.kar-qb-eye-btn[data-state="visible"] { background: var(--pq-primary); border-color: var(--pq-primary); color: white; }
.kar-qb-eye-btn .kar-eye-icon { pointer-events: none; }
.kar-qb-q-image { margin-bottom: 16px; }
.kar-qb-q-image img { max-width: 100%; border-radius: 8px; }

/* Options - Always Visible */
.kar-qb-options { display: flex; flex-direction: column; gap: 8px; }
.kar-qb-option { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--pq-light); border-radius: 8px; border: 2px solid transparent; transition: all 0.2s; }
.kar-qb-option.kar-answer-revealed { background: #d1fae5; border-color: #10b981; }
.kar-qb-option-label { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; background: var(--pq-white); border-radius: 50%; font-weight: 700; font-size: 13px; flex-shrink: 0; }
.kar-answer-revealed .kar-qb-option-label { background: var(--pq-success); color: white; }
.kar-qb-option-text { flex: 1; font-size: 14px; color: var(--pq-text); }
.kar-correct-badge { font-size: 12px; font-weight: 600; color: var(--pq-success); }
.kar-qb-explanation-block { display: flex; gap: 12px; background: #eff6ff; padding: 16px; border-radius: 8px; margin-top: 16px; border-left: 4px solid var(--pq-primary); }
.kar-explanation-icon { font-size: 20px; flex-shrink: 0; }
.kar-explanation-text { font-size: 14px; color: var(--pq-text); line-height: 1.6; }

/* Bottom Actions */
.kar-qb-bottom-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 30px; flex-wrap: wrap; gap: 16px; }
.kar-btn-test-yourself { background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%); color: var(--pq-dark); box-shadow: 0 4px 14px rgba(245, 158, 11, 0.4); }
.kar-btn-test-yourself:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5); color: var(--pq-dark); }

/* Self Test Mode */
.kar-selftest-header { text-align: center; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid var(--pq-border); }
.kar-selftest-title { font-size: 24px; font-weight: 700; color: var(--pq-dark); margin: 16px 0 8px 0; }
.kar-selftest-subtitle { font-size: 15px; color: var(--pq-text-muted); margin: 0; }
.kar-self-test-mode .kar-question-slide { display: block !important; border-bottom: 1px solid var(--pq-border); padding-bottom: 30px; margin-bottom: 30px; }
.kar-self-test-mode .kar-question-slide:last-of-type { border-bottom: none; }
.kar-selftest-nav { justify-content: center; }
.kar-exit-self-test { margin-bottom: 16px; }

/* Subject Cards */
.kar-subject-card { display: block; background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow); padding: 18px 16px; text-align: center; text-decoration: none; transition: all 0.3s ease; border: 2px solid transparent; }
.kar-subject-card:hover { transform: translateY(-4px); box-shadow: var(--pq-shadow-lg); border-color: var(--pq-primary); }
.kar-subject-name { font-size: 18px; font-weight: 700; color: var(--pq-dark); margin: 0 0 8px 0; line-height: 1.35; }
.kar-subject-count { font-size: 13px; color: var(--pq-primary); font-weight: 600; background: linear-gradient(135deg, #eff6ff 0%, #e0e7ff 100%); padding: 5px 12px; border-radius: 20px; display: inline-block; }

/* Subject Questions Page */
.kar-subject-questions-wrapper { max-width: 900px; margin: 0 auto; }
.kar-subject-header-card { background: linear-gradient(135deg, #059669 0%, #10b981 100%); border-radius: var(--pq-radius); padding: 30px; margin-bottom: 24px; color: white; display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 20px; }
.kar-subject-title { font-size: 28px; font-weight: 700; margin: 0 0 10px 0; }
.kar-subject-desc { font-size: 15px; opacity: 0.9; margin: 0 0 16px 0; }
.kar-subject-meta-bar { display: flex; gap: 12px; flex-wrap: wrap; }
.kar-btn-show-all-subject-answers { background: rgba(255,255,255,0.2); color: white; border: none; }
.kar-btn-show-all-subject-answers:hover { background: rgba(255,255,255,0.3); color: white; }

/* Subject Question Items */
.kar-subject-questions-list { margin-bottom: 30px; }
.kar-subject-question-item { background: var(--pq-white); border-radius: var(--pq-radius); box-shadow: var(--pq-shadow); margin-bottom: 16px; overflow: hidden; padding: 20px; transition: all 0.2s; }
.kar-subject-question-item:hover { box-shadow: var(--pq-shadow-lg); }
.kar-subject-q-header { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 16px; }
.kar-subject-q-number { background: linear-gradient(135deg, #059669 0%, #10b981 100%); color: white; padding: 4px 10px; border-radius: 6px; font-size: 12px; font-weight: 700; flex-shrink: 0; }
.kar-subject-q-title { font-size: 16px; color: var(--pq-dark); line-height: 1.6; flex: 1; }
.kar-subject-q-image { margin-bottom: 16px; }
.kar-subject-q-image img { max-width: 100%; border-radius: 8px; }
.kar-subject-options { display: flex; flex-direction: column; gap: 8px; }
.kar-subject-option { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--pq-light); border-radius: 8px; border: 2px solid transparent; transition: all 0.2s; }
.kar-subject-option.kar-answer-revealed { background: #d1fae5; border-color: #10b981; }
.kar-subject-option-label { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; background: var(--pq-white); border-radius: 50%; font-weight: 700; font-size: 13px; flex-shrink: 0; }
.kar-answer-revealed .kar-subject-option-label { background: var(--pq-success); color: white; }
.kar-subject-option-text { flex: 1; font-size: 14px; color: var(--pq-text); }
.kar-subject-explanation-block { display: flex; gap: 12px; background: #ecfdf5; padding: 16px; border-radius: 8px; margin-top: 16px; border-left: 4px solid #10b981; }

/* Chapter filter buttons */
.kar-chapter-filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px; }
.kar-chapter-btn { padding: 10px 18px; background: var(--pq-white); border: 2px solid var(--pq-border); border-radius: 25px; font-size: 14px; font-weight: 500; color: var(--pq-text); text-decoration: none; transition: all 0.2s; }
.kar-chapter-btn:hover { border-color: #059669; color: #059669; }
.kar-chapter-btn.kar-chapter-active { background: #059669; border-color: #059669; color: white; }
.kar-subchapter-filters { margin-top: -16px; }
.kar-subchapter-btn { font-size: 13px; padding: 8px 14px; }
.kar-subchapter-btn:hover { border-color: #7c3aed; color: #7c3aed; }
.kar-subchapter-btn.kar-chapter-active { background: #7c3aed; border-color: #7c3aed; color: white; }
.kar-subject-bottom-actions { display: flex; justify-content: flex-start; margin-top: 30px; }

/* Single-page exam layout */
.kar-quiz-all-questions { display: flex; flex-direction: column; gap: 24px; }
.kar-question-slide-full { display: block !important; margin: 0; padding: 0 0 24px; border-bottom: 1px solid var(--pq-border); }
.kar-question-slide-full:last-child { border-bottom: none; padding-bottom: 0; }
.kar-quiz-navigation-single-page { justify-content: center; margin-top: 28px; }
.kar-quiz-header-single-page .kar-progress-bar { width: 100% !important; }

/* Responsive */
@media (max-width: 768px) {
    .kar-register-card { padding: 24px; }
    .kar-quiz-questions, .kar-quiz-results { padding: 20px; }
    .kar-result-stats { grid-template-columns: 1fr; }
    .kar-qb-header-card, .kar-subject-header-card { flex-direction: column; }
    .kar-quiz-header-top { flex-direction: column; gap: 16px; align-items: flex-start; }
    .kar-pagination-controls { flex-direction: column; text-align: center; }
}

/* ==============================
   Math / Fraction Rendering
   ============================== */
.kar-frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 3px; font-size: 0.85em; line-height: 1.2; }
.kar-num { border-bottom: 1.5px solid currentColor; padding: 0 4px 2px; text-align: center; }
.kar-den { padding: 2px 4px 0; text-align: center; }
.kar-sqrt { position: relative; display: inline-block; margin: 0 2px; padding-left: 14px; }
.kar-sqrt::before { content: "√"; position: absolute; left: 0; top: -2px; font-size: 1.1em; }
.kar-sqrt::after { content: ""; position: absolute; top: 0; left: 12px; right: -2px; border-top: 1.5px solid currentColor; }