:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

.navbar-brand {
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: box-shadow 0.15s ease-in-out;
}

.card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.btn {
    border-radius: 0.375rem;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.btn:hover {
    transform: translateY(-1px);
}

.form-control, .form-select {
    border-radius: 0.375rem;
    border: 1px solid #dee2e6;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.badge {
    font-weight: 500;
    border-radius: 0.375rem;
}

.alert {
    border: none;
    border-radius: 0.5rem;
    border-left: 4px solid;
}

.alert-success {
    border-left-color: var(--success-color);
    background-color: #d1e7dd;
    color: #0a3622;
}

.alert-danger {
    border-left-color: var(--danger-color);
    background-color: #f8d7da;
    color: #58151c;
}

.alert-warning {
    border-left-color: var(--warning-color);
    background-color: #fff3cd;
    color: #664d03;
}

.alert-info {
    border-left-color: var(--info-color);
    background-color: #cff4fc;
    color: #055160;
}

.navbar {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

footer {
    margin-top: auto;
}

.img-thumbnail {
    border-radius: 0.375rem;
    transition: transform 0.2s ease-in-out;
}

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

.pagination .page-link {
    border-radius: 0.375rem;
    margin: 0 0.125rem;
    border: 1px solid #dee2e6;
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.text-truncate-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.aspect-ratio-1x1 {
    aspect-ratio: 1 / 1;
}

.aspect-ratio-16x9 {
    aspect-ratio: 16 / 9;
}

.object-fit-cover {
    object-fit: cover;
}

.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 0.125rem solid #f3f3f3;
    border-top: 0.125rem solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.hover-scale {
    transition: transform 0.2s ease-in-out;
}

.hover-scale:hover {
    transform: scale(1.02);
}

.glass-effect {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

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

@media (max-width: 768px) {
    .btn-group-vertical .btn {
        margin-bottom: 0.25rem;
    }
    
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .navbar-brand {
        font-size: 1.25rem;
    }
}

@media (max-width: 576px) {
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
    
    .h3 {
        font-size: 1.5rem;
    }
    
    .btn-group-vertical .btn {
        font-size: 0.875rem;
        padding: 0.375rem 0.75rem;
    }
}

.image-preview {
    max-height: 200px;
    overflow-y: auto;
}

.image-preview img {
    cursor: pointer;
}

.toast-container {
    z-index: 1050;
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label {
    opacity: 0.65;
    transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

.invalid-feedback {
    display: block;
}

.border-primary {
    border-color: var(--primary-color) !important;
}

.border-success {
    border-color: var(--success-color) !important;
}

.border-danger {
    border-color: var(--danger-color) !important;
}

.shadow-sm {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075) !important;
}

.shadow {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
}

.shadow-lg {
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.175) !important;
}