/* Enhanced Custom Styles for University Website */

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shadow-hover {
    transition: transform 0.3s, box-shadow 0.3s;
}

.shadow-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1) !important;
}

.activity-card {
    transition: transform 0.3s, box-shadow 0.3s;
}

.activity-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15) !important;
}

.activity-image {
    transition: transform 0.3s;
}

.activity-card:hover .activity-image {
    transform: scale(1.05);
}

.section-title {
    position: relative;
    padding-bottom: 15px;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Preview modal styles */
#imagePreviewModal .modal-content {
    border-radius: 12px;
    overflow: hidden;
}

#previewModalImage {
    max-height: 70vh;
    object-fit: contain;
}

/* Thumbnail grid improvements */
.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.thumbnail-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    background: white;
}

.thumbnail-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.thumbnail-img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    transition: transform 0.3s;
}

.thumbnail-item:hover .thumbnail-img {
    transform: scale(1.1);
}

.thumbnail-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: white;
    padding: 15px 10px 10px;
    font-size: 12px;
}

/* File preview styles */
.preview-container {
    border: 2px dashed #dee2e6;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    background: #f8f9fa;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    transition: border-color 0.3s;
}

.preview-container.dragover {
    border-color: #007bff;
    background: #e7f3ff;
}

.preview-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.document-preview {
    padding: 20px;
}

/* Responsive improvements */
@media (max-width: 768px) {
    .hero-section .display-4 {
        font-size: 2rem;
    }
    
    .thumbnail-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .preview-container {
        padding: 20px;
        min-height: 200px;
    }
}

/* Custom Styles for University Website */

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Feature Icons */
.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Card Hover Effects */
.shadow-hover {
    transition: transform 0.3s, box-shadow 0.3s;
}

.shadow-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1) !important;
}

/* Section Titles */
.section-title {
    position: relative;
    padding-bottom: 15px;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.section-subtitle {
    color: #6c757d;
    font-size: 1.1rem;
}

/* Custom Button Styles */
.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s;
}

/* Navigation */
.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

/* Footer */
footer a {
    transition: color 0.3s;
}

footer a:hover {
    color: #fff !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-section .display-4 {
        font-size: 2rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
    }
    
    .feature-icon i {
        font-size: 1.5rem !important;
    }
}


/* Loading animation */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}