/**
 * Enhanced Training Courses Management CSS
 * Version 2.0
 * 
 * @updated 2025-11-23
 */

/* ============================================
   Course Grid & Cards
   ============================================ */

.aom-courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.aom-course-card {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
}

.aom-course-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.aom-course-card-header {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 10;
}

.aom-course-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.aom-course-thumbnail {
    width: 100%;
    height: 180px;
    overflow: hidden;
    background: var(--dark-bg);
    position: relative;
}

.aom-course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.aom-course-card:hover .aom-course-thumbnail img {
    transform: scale(1.05);
}

.aom-course-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.aom-course-placeholder i {
    font-size: 48px;
    color: rgba(255, 255, 255, 0.5);
}

.aom-course-info {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.aom-course-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 8px 0;
    color: var(--text-primary);
    line-height: 1.4;
}

.aom-course-instructor {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0 0 12px 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.aom-course-instructor i {
    font-size: 16px;
}

.aom-course-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 16px 0;
    flex: 1;
}

.aom-course-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.aom-course-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.aom-course-meta i {
    font-size: 16px;
    color: var(--primary-color);
}

.aom-course-badges {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.aom-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    display: inline-block;
}

.aom-badge-beginner {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success-color);
}

.aom-badge-intermediate {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning-color);
}

.aom-badge-advanced {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
}

.aom-badge-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success-color);
}

.aom-badge-warning {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning-color);
}

.aom-badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--info-color);
}

.aom-course-actions {
    padding: 16px 20px;
    background: var(--dark-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
    justify-content: space-between;
    align-items: center;
}

/* ============================================
   Lesson Management
   ============================================ */

.aom-lessons-list {
    max-height: 500px;
    overflow-y: auto;
}

.aom-lesson-item {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    margin-bottom: 12px;
    transition: all 0.2s ease;
}

.aom-lesson-item:hover {
    background: var(--dark-bg);
    border-color: var(--primary-color);
}

.aom-lesson-item h4 {
    margin: 0 0 8px 0;
    font-size: 16px;
    color: var(--text-primary);
}

.aom-lesson-item p {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.aom-lesson-item-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.aom-lesson-drag-handle {
    cursor: move;
    color: var(--text-secondary);
    margin-right: 8px;
}

/* ============================================
   Enrollments Table
   ============================================ */

.aom-enrollments-list {
    max-height: 500px;
    overflow-y: auto;
}

.aom-table {
    width: 100%;
    border-collapse: collapse;
}

.aom-table thead {
    background: var(--dark-bg);
    position: sticky;
    top: 0;
    z-index: 10;
}

.aom-table th {
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
}

.aom-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-primary);
}

.aom-table tbody tr:hover {
    background: var(--dark-bg);
}

.aom-table tbody tr:last-child td {
    border-bottom: none;
}

/* ============================================
   Course Modal Specific
   ============================================ */

#course-modal .aom-modal-content {
    max-width: 600px;
}

#course-modal .aom-form-group {
    margin-bottom: 20px;
}

#course-modal label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-primary);
}

#course-modal label .required {
    color: var(--danger-color);
    margin-left: 2px;
}

#course-modal input[type="text"],
#course-modal input[type="number"],
#course-modal input[type="url"],
#course-modal select,
#course-modal textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

#course-modal input:focus,
#course-modal select:focus,
#course-modal textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#course-modal textarea {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
    line-height: 1.5;
}

#course-modal select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23fff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
    appearance: none;
}

#course-modal small {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-secondary);
}

/* ============================================
   Lessons Modal
   ============================================ */

#lessons-modal .aom-modal-content {
    max-width: 700px;
}

.aom-add-lesson-btn {
    margin-bottom: 20px;
}

/* ============================================
   Enrollments Modal
   ============================================ */

#enrollments-modal .aom-modal-content {
    max-width: 800px;
}

/* ============================================
   Loading State
   ============================================ */

.aom-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

.aom-loading::before {
    content: "";
    width: 24px;
    height: 24px;
    margin-right: 12px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Responsive Design
   ============================================ */

@media screen and (max-width: 1200px) {
    .aom-courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
    }
}

@media screen and (max-width: 768px) {
    .aom-courses-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .aom-course-thumbnail {
        height: 160px;
    }
    
    .aom-course-actions {
        flex-wrap: wrap;
    }
    
    .aom-course-actions .aom-btn {
        flex: 1 1 calc(50% - 4px);
        min-width: 0;
    }
    
    .aom-table {
        font-size: 13px;
    }
    
    .aom-table th,
    .aom-table td {
        padding: 10px 12px;
    }
    
    #course-modal .aom-modal-content,
    #lessons-modal .aom-modal-content,
    #enrollments-modal .aom-modal-content {
        width: 95%;
        margin: 20px auto;
    }
}

@media screen and (max-width: 480px) {
    .aom-course-meta {
        flex-direction: column;
        gap: 8px;
    }
    
    .aom-course-actions .aom-btn {
        font-size: 12px;
        padding: 6px 10px;
    }
    
    .aom-course-actions .aom-btn i {
        font-size: 14px;
    }
    
    .aom-badge {
        font-size: 11px;
        padding: 3px 10px;
    }
}

/* ============================================
   Dark Theme Adjustments
   ============================================ */

.aom-dark-theme .aom-course-card {
    background: var(--dark-surface);
    border-color: rgba(255, 255, 255, 0.1);
}

.aom-dark-theme .aom-course-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.aom-dark-theme .aom-course-thumbnail {
    background: var(--dark-bg);
}

.aom-dark-theme .aom-course-actions {
    background: var(--dark-bg);
    border-top-color: rgba(255, 255, 255, 0.1);
}

.aom-dark-theme .aom-lesson-item {
    background: var(--dark-surface);
    border-color: rgba(255, 255, 255, 0.1);
}

.aom-dark-theme .aom-lesson-item:hover {
    background: var(--dark-bg);
    border-color: var(--primary-color);
}

.aom-dark-theme .aom-table thead {
    background: var(--dark-bg);
}

.aom-dark-theme .aom-table th,
.aom-dark-theme .aom-table td {
    border-color: rgba(255, 255, 255, 0.1);
}

.aom-dark-theme .aom-table tbody tr:hover {
    background: var(--dark-surface);
}