/**
 * Topic Practice Page Styles – Matching MCQs Design Pattern
 */

/* ==================== TOPIC HERO SECTION ==================== */
.topic-hero {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-12) 0;
    position: relative;
    overflow: hidden;
    min-height: 280px;
    display: flex;
    align-items: center;
    border-radius: 0;
    margin-bottom: var(--space-8);
}

/* MCQ Icons Background Pattern */
.topic-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-opacity='0.1' stroke-width='1.5'%3E%3Cpath d='M9 5H7a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V7a2 2 0 0 0-2-2h-2M9 5a2 2 0 0 0 2 2h2a2 2 0 0 0 2-2M9 5a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2m-6 9h2m-2 4h4'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-position: 0 0, 20px 30px, 40px 60px;
    background-size: 80px 80px, 70px 70px, 60px 60px;
    opacity: 0.3;
    animation: topicFloat 40s linear infinite;
}

.topic-hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
    pointer-events: none;
}

@keyframes topicFloat {
    0% { transform: translateY(0) translateX(0); }
    100% { transform: translateY(-50px) translateX(-30px); }
}

.topic-hero .container {
    position: relative;
    z-index: 2;
}

.topic-hero h1 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--space-4);
    color: var(--color-white);
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.2);
    letter-spacing: -0.02em;
}

.topic-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-2);
}

.topic-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-white);
    font-size: var(--font-size-base);
    opacity: 0.95;
}

.topic-meta-item i {
    font-size: var(--font-size-base);
}

.topic-difficulty-badge {
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.topic-stats-badge {
    background: rgba(255, 255, 255, 0.15);
    color: var(--color-white);
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.topic-stats-badge i {
    font-size: var(--font-size-xs);
}

.topic-header-actions {
    display: flex;
    justify-content: flex-end;
}

.topic-header-actions .btn-light {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--color-white);
    padding: var(--space-3) var(--space-6);
    border-radius: 8px;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.topic-header-actions .btn-light:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

/* ==================== BREADCRUMB ==================== */
.breadcrumb-wrapper {
    margin-bottom: var(--space-5);
}

.breadcrumb {
    background: transparent;
    padding: 0;
    margin: 0;
}

.breadcrumb-item {
    font-size: var(--font-size-sm);
}

.breadcrumb-item a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: var(--font-weight-medium);
}

.breadcrumb-item a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--color-neutral-muted);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--color-neutral-muted);
    content: "›";
    font-size: var(--font-size-lg);
    line-height: 1;
}

/* ==================== DESCRIPTION CARDS ==================== */
.description-card {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-5);
    margin-bottom: var(--space-5);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-neutral-border-light);
}

.description-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.description-header h5 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-text);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.description-header h5 i {
    color: var(--color-primary);
}

.description-toggle {
    background: transparent;
    border: none;
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0;
    cursor: pointer;
}

.description-toggle:hover {
    color: var(--color-secondary);
}

.description-preview {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: 0;
}

.description-full {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-5);
    margin-bottom: var(--space-5);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-neutral-border-light);
    display: none;
}

.description-full.show {
    display: block;
}

.description-full p {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-base);
    line-height: 1.8;
    margin-bottom: 0;
}

/* ==================== QUESTION CARDS ==================== */
.question-card {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-6);
    margin-bottom: var(--space-5);
    border: 1px solid var(--color-neutral-border-light);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
}

.question-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-card-hover);
}

.question-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.question-number {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-base);
    flex-shrink: 0;
}

.question-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-text);
    line-height: 1.6;
    flex: 1;
}

.question-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.difficulty-badge {
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.difficulty-badge.easy {
    background: rgba(40, 167, 69, 0.1);
    color: #28a745;
}

.difficulty-badge.medium {
    background: rgba(255, 193, 7, 0.1);
    color: #ffc107;
}

.difficulty-badge.hard {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
}

.marks-badge {
    background: var(--color-neutral-bg-light);
    color: var(--color-neutral-muted);
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.marks-badge i {
    color: var(--color-primary);
    font-size: 10px;
}

.hint-btn {
    background: transparent;
    border: 1px solid #ffc107;
    color: #ffc107;
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.hint-btn:hover {
    background: #ffc107;
    color: var(--color-white);
}

.hint-section {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    border-radius: 5px;
    padding: var(--space-4);
    margin-bottom: var(--space-4);
    display: none;
}

.hint-section.show {
    display: block;
}

.hint-section i {
    color: #ffc107;
    margin-right: var(--space-2);
}

.hint-section p {
    color: #856404;
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Options */
.options-container {
    margin: var(--space-4) 0;
}

.option-item {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-neutral-border);
    border-radius: 8px;
    margin-bottom: var(--space-2);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-item:hover {
    background: var(--color-neutral-bg-light);
    border-color: var(--color-primary);
}

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

.option-letter {
    width: 28px;
    height: 28px;
    background: var(--color-neutral-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    margin-right: var(--space-3);
    color: var(--color-neutral-text);
    flex-shrink: 0;
}

.option-item.selected .option-letter {
    background: var(--color-primary);
    color: var(--color-white);
}

.option-text {
    font-size: var(--font-size-base);
    color: var(--color-neutral-text);
    flex: 1;
}

/* ==================== TEST NAVIGATION ==================== */
.test-navigation {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-5);
    margin-top: var(--space-5);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-neutral-border-light);
    position: sticky;
    bottom: 20px;
    z-index: 100;
}

.progress-indicator {
    height: 6px;
    background: var(--color-neutral-bg-light);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--space-4);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 3px;
    transition: width var(--transition-smooth);
}

.navigation-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    color: var(--color-neutral-muted);
    font-size: var(--font-size-sm);
}

.navigation-info strong {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

.clear-btn {
    background: transparent;
    border: 1px solid var(--color-neutral-border);
    color: var(--color-neutral-muted);
    padding: var(--space-2) var(--space-4);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-btn:hover {
    background: var(--color-neutral-bg-light);
    border-color: var(--color-neutral-muted);
    color: var(--color-neutral-text);
}

.pagination-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.pagination-buttons .btn {
    padding: var(--space-2) var(--space-5);
    border-radius: 8px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.pagination-buttons .btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border: none;
}

.pagination-buttons .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.pagination-buttons .btn-outline-secondary {
    background: transparent;
    border: 1px solid var(--color-neutral-border);
    color: var(--color-neutral-muted);
}

.pagination-buttons .btn-outline-secondary:hover {
    background: var(--color-neutral-bg-light);
    border-color: var(--color-neutral-border);
    color: var(--color-neutral-text);
}

.pagination-buttons .btn-success {
    background: #28a745;
    color: var(--color-white);
    border: none;
}

.pagination-buttons .btn-success:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ==================== QUESTION PALETTE ==================== */
.question-palette {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-5);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-neutral-border-light);
    position: sticky;
    top: 20px;
}

.palette-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-text);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.palette-title i {
    color: var(--color-primary);
}

.palette-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.palette-item {
    width: 36px;
    height: 36px;
    background: var(--color-neutral-bg-light);
    border: 1px solid var(--color-neutral-border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-text);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.palette-item:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.palette-item.answered {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.palette-item.current {
    border: 2px solid #ffc107;
    transform: scale(1.1);
    background: var(--color-white);
    color: var(--color-primary);
}

.palette-info {
    background: var(--color-neutral-bg-light);
    border-radius: 8px;
    padding: var(--space-3);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-neutral-muted);
}

.palette-info i {
    color: var(--color-primary);
    margin-right: var(--space-1);
}

/* Instructions */
.instructions {
    margin: var(--space-4) 0;
    padding: var(--space-4) 0;
    border-top: 1px solid var(--color-neutral-border-light);
    border-bottom: 1px solid var(--color-neutral-border-light);
}

.instructions h6 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-text);
    margin-bottom: var(--space-3);
}

.instructions ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.instructions li {
    font-size: var(--font-size-xs);
    color: var(--color-neutral-muted);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.instructions li i {
    color: var(--color-primary);
    font-size: 10px;
}

/* Difficulty Stats */
.difficulty-stats {
    margin-top: var(--space-4);
}

.difficulty-stats h6 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-text);
    margin-bottom: var(--space-3);
}

.difficulty-stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
    font-size: var(--font-size-xs);
}

.difficulty-stat-row .label {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.difficulty-stat-row .label i {
    font-size: 10px;
}

.difficulty-stat-row .label.easy i {
    color: #28a745;
}

.difficulty-stat-row .label.medium i {
    color: #ffc107;
}

.difficulty-stat-row .label.hard i {
    color: #dc3545;
}

.difficulty-stat-row .count {
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-text);
}

/* ==================== PAGINATION ==================== */
.pagination-wrapper {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-neutral-border-light);
}

.pagination {
    margin: 0;
    justify-content: center;
}

.pagination .page-link {
    border: 1px solid var(--color-neutral-border);
    color: var(--color-neutral-muted);
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-3);
    transition: all var(--transition-fast);
}

.pagination .page-link:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.pagination .page-item.active .page-link {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* ==================== EMPTY STATES ==================== */
.empty-state {
    text-align: center;
    padding: var(--space-8) var(--space-4);
}

.empty-state i {
    font-size: var(--font-size-4xl);
    color: var(--color-neutral-muted-light);
    margin-bottom: var(--space-4);
}

.empty-state h5 {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-2);
}

.empty-state p {
    color: var(--color-neutral-muted-light);
    font-size: var(--font-size-sm);
    margin-bottom: 0;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 992px) {
    .topic-hero h1 {
        font-size: var(--font-size-2xl);
    }
    
    .topic-header-actions .btn-light {
        padding: var(--space-2) var(--space-4);
        font-size: var(--font-size-sm);
    }
    
    .question-palette {
        margin-top: var(--space-5);
        position: static;
    }
}

@media (max-width: 768px) {
    .topic-hero {
        padding: var(--space-8) 0;
    }
    
    .topic-hero h1 {
        font-size: var(--font-size-xl);
        text-align: center;
    }
    
    .topic-meta {
        justify-content: center;
    }
    
    .topic-header-actions {
        justify-content: center;
        margin-top: var(--space-4);
    }
    
    .question-header {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .question-number {
        margin-bottom: var(--space-1);
    }
    
    .pagination-buttons {
        flex-direction: column;
    }
    
    .pagination-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .topic-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .question-card {
        padding: var(--space-4);
    }
    
    .option-item {
        padding: var(--space-2) var(--space-3);
    }
    
    .option-letter {
        width: 24px;
        height: 24px;
        font-size: var(--font-size-xs);
    }
    
    .palette-item {
        width: 32px;
        height: 32px;
        font-size: var(--font-size-xs);
    }
}