/* Custom CSS for USV Blog */

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Custom animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Hover effects for cards */
.hover-card {
    transition: all 0.3s ease;
}

.hover-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Gradient text effect */
.gradient-text {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Custom button hover effects */
.btn-hover {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-hover:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Navigation link hover effect */
.nav-link {
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: #60a5fa;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Article card image hover effect */
.article-image {
    transition: transform 0.3s ease;
}

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

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive typography */
@media (max-width: 640px) {
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1f2937;
        color: #f9fafb;
    }
}

/* Print styles */
@media print {
    nav, footer, .no-print {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
}

/* Accessibility improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

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

/* Blog post specific styles */
.blog-content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.blog-content p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.blog-content ul {
    margin-bottom: 1.5rem;
}

.blog-content li {
    margin-bottom: 0.5rem;
}

/* Code blocks */
.code-block {
    background-color: #1f2937;
    color: #f9fafb;
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
}

/* Quote styles */
.blockquote {
    border-left: 4px solid #3b82f6;
    background-color: #f8fafc;
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
}

/* Image captions */
.image-caption {
    text-align: center;
    font-size: 0.875rem;
    color: #6b7280;
    margin-top: 0.5rem;
}

/* Social share buttons */
.social-share {
    display: flex;
    gap: 0.5rem;
    margin-top: 2rem;
}

.social-share button {
    padding: 0.5rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    background-color: white;
    color: #374151;
    transition: all 0.2s ease;
}

.social-share button:hover {
    background-color: #f3f4f6;
    border-color: #9ca3af;
}

/* Return to Homepage Button */
.return-home {
    position: fixed;
    bottom: 90px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #059669;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    text-decoration: none;
}

.return-home:hover {
    background-color: #10b981;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.return-home:active {
    transform: translateY(0);
}

.return-home.show {
    opacity: 1;
    visibility: visible;
}

.return-home i {
    transition: transform 0.3s ease;
}

.return-home:hover i {
    transform: translateY(-2px);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #1e3a8a;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
}

.back-to-top:hover {
    background-color: #3b82f6;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.back-to-top:active {
    transform: translateY(0);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top i {
    transition: transform 0.3s ease;
}

.back-to-top:hover i {
    transform: translateY(-2px);
}

/* Responsive buttons */
@media (max-width: 640px) {
    .return-home {
        bottom: 75px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
}