/* ========================================
   Courses Page Styles
   ======================================== */

/* Page Header */
.page-header {
    padding-top: 64px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, white 100%);
    border-bottom: 1px solid var(--border-color);
}

.page-header-content {
    display: flex;
    align-items: center;
    gap: 48px;
    padding: 48px 0;
}

.page-header-illustration {
    flex: 0 0 300px;
}

.page-header-illustration img {
    width: 100%;
    border-radius: var(--radius-lg);
}

.page-header-text {
    flex: 1;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.search-box {
    display: flex;
    max-width: 400px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: white;
}

.search-input {
    flex: 1;
    padding: 12px 16px;
    border: none;
    outline: none;
    font-size: 0.875rem;
}

.search-btn {
    padding: 12px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.search-btn:hover {
    background: var(--primary-light);
}

/* Course Categories */
.course-categories {
    padding: 20px 0;
    background: white;
    border-bottom: 1px solid var(--border-color);
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.category-tag {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.category-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tag.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.tag-count {
    font-size: 0.6875rem;
    padding: 2px 6px;
    background: rgba(0,0,0,0.1);
    border-radius: 10px;
}

.category-tag.active .tag-count {
    background: rgba(255,255,255,0.2);
}

/* Course Content Layout */
.course-content {
    padding: 32px 0 60px;
    background: var(--bg-secondary);
}

.course-layout {
    display: flex;
    gap: 24px;
}

/* Sidebar */
.course-sidebar {
    flex: 0 0 200px;
}

.sidebar-section {
    background: white;
    border-radius: var(--radius-lg);
    padding: 16px 0;
    box-shadow: var(--shadow-sm);
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-item:hover {
    background: var(--bg-secondary);
}

.sidebar-item.active {
    background: var(--bg-secondary);
    border-left: 3px solid var(--primary-color);
}

.sidebar-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.sidebar-item.active .sidebar-icon {
    background: var(--primary-color);
    color: white;
}

.sidebar-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.sidebar-item.active .sidebar-text {
    color: var(--primary-color);
    font-weight: 500;
}

/* Course Main */
.course-main {
    flex: 1;
}

.course-grid-detailed {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* Course Card Detailed */
.course-card-detailed {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.course-card-detailed:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.course-card-header {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.course-card-header img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-date {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    background: rgba(0,0,0,0.7);
    color: white;
    font-size: 0.6875rem;
    border-radius: 4px;
}

.course-number {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50%;
}

.course-card-body {
    padding: 16px;
}

.course-title-detailed {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.course-tag {
    display: inline-block;
    padding: 2px 8px;
    background: #e6f7ff;
    color: var(--accent-color);
    font-size: 0.6875rem;
    border-radius: 4px;
    margin-bottom: 12px;
}

.course-tag.system {
    background: #f0f5ff;
    color: var(--primary-color);
}

.course-info {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
}

.course-info span {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-category-select {
    margin-bottom: 12px;
}

.course-category-select select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: white;
    cursor: pointer;
}

.course-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-view-course {
    flex: 1;
    padding: 10px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.btn-view-course:hover {
    opacity: 0.9;
}

.action-icons {
    display: flex;
    gap: 4px;
}

.icon-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--primary-color);
    color: white;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 32px;
}

.page-btn {
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.page-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* Responsive */
@media (max-width: 1024px) {
    .course-layout {
        flex-direction: column;
    }
    
    .course-sidebar {
        flex: none;
        width: 100%;
    }
    
    .sidebar-section {
        display: flex;
        flex-wrap: wrap;
        padding: 12px;
    }
    
    .sidebar-item {
        flex: 0 0 auto;
        padding: 8px 16px;
    }
    
    .course-grid-detailed {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .page-header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .page-header-illustration {
        flex: none;
        max-width: 200px;
    }
    
    .search-box {
        margin: 0 auto;
    }
    
    .course-grid-detailed {
        grid-template-columns: 1fr;
    }
    
    .category-tags {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 8px;
    }
}