/* Trend AI - Custom Styles */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Navbar */
.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: var(--info-color);
}

/* Cards */
.card {
    transition: transform 0.2s, box-shadow 0.2s;
    border: none;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
}

.card-img-top {
    object-fit: cover;
}

/* Image Performance Optimization */
img {
    /* Prevent layout shift during load */
    max-width: 100%;
    height: auto;
    /* Smooth loading */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Lazy loading images - fade in effect */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease-in;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Placeholder for images while loading */
img[loading="lazy"]::before {
    content: '';
    display: block;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Hero Section */
.jumbotron {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0056b3 100%);
}

/* Buttons */
.btn {
    border-radius: 0.375rem;
    font-weight: 500;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

/* Alerts */
.alert {
    border-radius: 0.5rem;
    border: none;
}

/* Badges */
.badge {
    font-weight: 500;
    padding: 0.5em 0.75em;
}

/* Tables */
.table-hover tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.025);
    cursor: pointer;
}

/* Loading Spinner */
.spinner-border {
    margin: 2rem auto;
}

/* Image Preview */
#imagePreview img {
    transition: transform 0.2s;
}

#imagePreview img:hover {
    transform: scale(1.05);
}

/* Footer */
footer {
    margin-top: auto;
}

/* Utility Classes */
.shadow-hover {
    transition: box-shadow 0.3s;
}

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

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

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

/* Responsive */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.2rem;
    }
    
    .jumbotron {
        padding: 2rem 1rem !important;
    }
    
    .display-4 {
        font-size: 2rem;
    }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}