/**
 * Subject Page Styles – Matching MCQs Design Pattern
 */

/* ==================== SUBJECT HERO SECTION ==================== */
.subject-hero {
    position: relative;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    overflow: hidden;
    padding: var(--space-8) var(--space-4);
}

/* MCQ Icons Background Pattern - Same as MCQs index */
.subject-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: subjectFloat 40s linear infinite;
}

.subject-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 subjectFloat {
    0% { transform: translateY(0) translateX(0); }
    100% { transform: translateY(-50px) translateX(-30px); }
}

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

.subject-hero h1 {
    font-size: var(--font-size-4xl);
    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;
    line-height: 1.2;
}

.subject-hero p {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    max-width: 650px;
    margin: 0 auto var(--space-4) 0;
    line-height: 1.6;
    color: var(--color-white);
    font-weight: var(--font-weight-normal);
}

.subject-icon-large {
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    color: var(--color-white);
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 3px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-smooth);
}

.subject-icon-large:hover {
    transform: scale(1.05) rotate(5deg);
    border-color: rgba(255, 255, 255, 0.3);
}

/* ==================== SUBJECT STATS SECTION (Overlapping Hero) ==================== */
.subject-stats-section {
    margin-top: calc(var(--space-8) * -1);
    position: relative;
    z-index: 5;
}

.subject-stat-card {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-6) var(--space-4);
    text-align: center;
    border: 1px solid var(--color-neutral-border-light);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.subject-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.subject-stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-neutral-border);
}

.subject-stat-card:hover::before {
    opacity: 1;
}

.subject-stat-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    background: var(--color-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
    line-height: 1;
}

.subject-stat-label {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==================== 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;
}

/* ==================== SECTION TITLES ==================== */
.section-title-wrapper {
    margin-bottom: var(--space-6);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-neutral-text);
    margin-bottom: var(--space-2);
    letter-spacing: -0.02em;
}

.section-subtitle {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-base);
}

/* ==================== TOPICS GRID ==================== */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.topic-card {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-5);
    border: 1px solid var(--color-neutral-border-light);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    height: 100%;
    display: block;
    text-decoration: none;
}

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary);
}

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

.topic-header h6 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-text);
    margin-bottom: 0;
}

.topic-count {
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    padding: var(--space-1) var(--space-2);
    border-radius: 20px;
    min-width: 40px;
    text-align: center;
}

.topic-description {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-xs);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.topic-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-neutral-border-light);
}

.topic-difficulty {
    padding: var(--space-1) var(--space-3);
    border-radius: 20px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    background: var(--color-neutral-bg-light);
    color: var(--color-neutral-muted);
}

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

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

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

.topic-time {
    font-size: var(--font-size-xs);
    color: var(--color-neutral-muted);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

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

/* ==================== QUESTION PREVIEW CARDS ==================== */
.question-preview {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--space-5);
    border: 1px solid var(--color-neutral-border-light);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    margin-bottom: var(--space-4);
}

.question-preview:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.question-number {
    width: 36px;
    height: 36px;
    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-sm);
    flex-shrink: 0;
}

.question-meta {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
    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;
}

.topic-tag {
    background: var(--color-neutral-bg-light);
    color: var(--color-neutral-muted);
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}

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

.question-text {
    color: var(--color-neutral-text);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.question-test-types {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
    margin-bottom: var(--space-3);
}

.test-type-tag {
    background: var(--color-neutral-bg-light);
    color: var(--color-neutral-muted);
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
    border-radius: 20px;
}

.question-preview .btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
    border-radius: 20px;
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-fast);
}

.question-preview .btn-outline-primary {
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    background: transparent;
}

.question-preview .btn-outline-primary:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* ==================== SIDEBAR WIDGETS ==================== */
.sidebar-widget {
    background: var(--color-white);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-neutral-border-light);
    transition: all var(--transition-smooth);
}

.sidebar-widget:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-neutral-border);
}

.sidebar-widget .card-header {
        background: var(--color-primary);
    color: var(--color-white);
    border: none;
    font-weight: var(--font-weight-bold);
    padding: var(--space-4) var(--space-5);
}

.sidebar-widget .card-header h5 {
    margin: 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sidebar-widget .card-header i {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.sidebar-widget .card-body {
    padding: var(--space-5);
}

/* Difficulty Stats */
.difficulty-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.difficulty-stat-item {
    margin-bottom: var(--space-2);
}

.difficulty-stat-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-neutral-text);
}

.difficulty-stat-label span:first-child {
    font-weight: var(--font-weight-medium);
}

.difficulty-stat-label span:last-child {
    color: var(--color-neutral-muted);
}

.difficulty-progress {
    height: 8px;
    background: var(--color-neutral-bg-light);
    border-radius: 4px;
    overflow: hidden;
}

.difficulty-progress-bar {
    height: 100%;
    border-radius: 4px;
    transition: width var(--transition-smooth);
}

.difficulty-progress-bar.easy {
    background: #28a745;
}

.difficulty-progress-bar.medium {
    background: #ffc107;
}

.difficulty-progress-bar.hard {
    background: #dc3545;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.quick-action-btn {
    padding: var(--space-3) var(--space-5);
    border-radius: 8px;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    border: none;
    width: 100%;
    cursor: pointer;
    text-decoration: none;
}

.quick-action-btn.primary {
        background: var(--color-primary);
    color: var(--color-white);
}

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

.quick-action-btn.outline-primary {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.quick-action-btn.outline-primary:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

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

.quick-action-btn.outline-secondary:hover {
    background: var(--color-neutral-bg-light);
    color: var(--color-neutral-text);
}

/* ==================== 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 p {
    color: var(--color-neutral-muted);
    font-size: var(--font-size-base);
    margin-bottom: 0;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 992px) {
    .subject-hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .subject-hero p {
        font-size: var(--font-size-base);
    }
    
    .subject-icon-large {
        width: 80px;
        height: 80px;
        font-size: var(--font-size-2xl);
    }
}

@media (max-width: 768px) {
    .subject-hero {
        padding: var(--space-8) 0;
        text-align: center;
    }
    
    .subject-hero h1 {
        font-size: var(--font-size-2xl);
    }
    
    .subject-hero p {
        margin-left: auto;
        margin-right: auto;
    }
    
    .subject-icon-large {
        margin-top: var(--space-4);
    }
    
    .subject-stat-number {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
    }
    
    .question-preview .d-flex {
        flex-direction: column;
        gap: var(--space-3);
    }
}

@media (max-width: 576px) {
    .subject-hero h1 {
        font-size: var(--font-size-xl);
    }
    
    .subject-stat-number {
        font-size: var(--font-size-xl);
    }
    
    .subject-stat-label {
        font-size: var(--font-size-xs);
    }
    
    .topic-card {
        padding: var(--space-4);
    }
    
    .question-preview {
        padding: var(--space-4);
    }
}