/* ==========================================
   EXERCISES PAGE STYLES
   ========================================== */

.exercise-categories {
    padding: var(--spacing-xl) var(--spacing-md);
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

/* Exercises Grid */
.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.exercise-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 15px var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.exercise-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-lg);
}

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

.exercise-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-icon i {
    font-size: 1.5rem;
    color: white;
}

.exercise-badge {
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-beginner {
    background: var(--gradient-success);
    color: white;
}

.badge-intermediate {
    background: var(--gradient-warning);
    color: white;
}

.badge-advanced {
    background: linear-gradient(135deg, #EF4444 0%, #DC2626 100%);
    color: white;
}

.exercise-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-primary);
}

.exercise-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.exercise-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border);
}

.exercise-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.exercise-meta i {
    color: var(--primary);
}

.start-exercise-btn {
    width: 100%;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--border);
}

.modal-header h2 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    color: var(--primary);
}

.modal-close {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--danger);
    color: white;
    transform: rotate(90deg);
}

/* Exercise Info */
.exercise-info {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
    width: 0%;
}

.exercise-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exercise-stats span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.exercise-stats i {
    color: var(--primary);
}

/* Exercise Body */
.exercise-body {
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: 300px;
}

.question-container {
    animation: fadeInQuestion 0.3s ease;
}

@keyframes fadeInQuestion {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.question-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    line-height: 1.6;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-btn {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    color: var(--text-primary);
}

.option-btn:hover {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.1);
    transform: translateX(5px);
}

.option-btn.selected {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.15);
}

.option-btn.correct {
    border-color: var(--secondary);
    background: rgba(16, 185, 129, 0.15);
}

.option-btn.incorrect {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
}

.option-btn:disabled {
    cursor: not-allowed;
}

/* Fill in the blank */
.fill-blank-input {
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    width: 200px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.fill-blank-input:focus {
    outline: none;
    border-color: var(--primary);
}

.fill-blank-input.correct {
    border-color: var(--secondary);
    background: rgba(16, 185, 129, 0.1);
}

.fill-blank-input.incorrect {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

/* Feedback */
.feedback-box {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: none;
    animation: fadeIn 0.3s ease;
}

.feedback-box.show {
    display: block;
}

.feedback-box.correct {
    background: rgba(16, 185, 129, 0.15);
    border: 2px solid var(--secondary);
}

.feedback-box.incorrect {
    background: rgba(239, 68, 68, 0.15);
    border: 2px solid var(--danger);
}

.feedback-box p {
    margin: 0;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feedback-box.correct p {
    color: var(--secondary);
}

.feedback-box.incorrect p {
    color: var(--danger);
}

/* Exercise Actions */
.exercise-actions {
    padding: var(--spacing-lg);
    border-top: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

/* Results Modal */
.results-header {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--gradient-primary);
    color: white;
}

.results-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.results-header h2 {
    font-size: 2rem;
    font-family: var(--font-primary);
}

.results-body {
    padding: var(--spacing-xl);
    text-align: center;
}

.score-circle {
    position: relative;
    margin: 0 auto var(--spacing-xl);
    width: 200px;
    height: 200px;
}

.score-bg,
.score-progress {
    fill: none;
    stroke-width: 10;
}

.score-bg {
    stroke: var(--bg-tertiary);
}

.score-progress {
    stroke: var(--primary);
    stroke-linecap: round;
    transform: rotate(-90deg);
    transform-origin: center;
    transition: stroke-dashoffset 1s ease;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--font-primary);
}

.results-details {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    font-size: 1.1rem;
}

.result-item i {
    font-size: 1.5rem;
}

.result-item i.fa-check-circle {
    color: var(--secondary);
}

.result-item i.fa-times-circle {
    color: var(--danger);
}

.result-item i.fa-star {
    color: var(--accent);
}

.results-message {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
}

.results-actions {
    padding: var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .exercises-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        max-height: 95vh;
    }
    
    .exercise-actions {
        flex-direction: column;
    }
    
    .exercise-actions button {
        width: 100%;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .results-actions button {
        width: 100%;
    }
    
    .category-filters {
        justify-content: flex-start;
    }
}