/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f9fafb;
    min-height: 100vh;
}

/* 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;
}

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Thumbnail Preview Styles */
.thumbnail-preview {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: #f3f4f6;
}

.thumbnail-img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

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

/* Loading states */
.thumbnail-preview.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.6),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    outline: none;
}

.btn:focus {
    outline: 2px solid transparent;
    outline-offset: 2px;
}

.btn-primary {
    background-color: #ff0000;
    color: white;
}

.btn-primary:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
}

.btn-outline {
    background-color: transparent;
    color: #374151;
    border: 1px solid #d1d5db;
}

.btn-outline:hover {
    background-color: #f9fafb;
    border-color: #9ca3af;
}

/* Card Styles */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

/* Dark mode card styles */
.dark .card {
    background: #1f2937;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.dark .card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* Input Styles */
.input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: white;
}

.input:focus {
    outline: none;
    border-color: #ff0000;
    box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
}

.dark .input {
    background: #374151;
    border-color: #4b5563;
    color: white;
}

.dark .input:focus {
    border-color: #ff0000;
}

/* Navigation Styles */
.nav-sticky {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

.dark .nav-sticky {
    background: rgba(31, 41, 55, 0.9);
}

/* Hero Section */
.hero-gradient {
    background: linear-gradient(135deg, #ff0000 0%, #dc2626 100%);
}

/* Feature Icons */
.feature-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin: 0 auto 1rem;
}

/* Notification Toast */
.notification-success {
    background: #10b981;
}

.notification-error {
    background: #ef4444;
}

.notification-warning {
    background: #f59e0b;
}

.notification-info {
    background: #3b82f6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .thumbnail-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.875rem;
    }
    
    .feature-card {
        padding: 1.5rem 1rem;
    }
}

/* Print Styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid #000;
    }
    
    .btn-primary {
        border: 2px solid #000;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for better accessibility */
.btn:focus-visible,
.input:focus-visible,
a:focus-visible {
    outline: 2px solid #ff0000;
    outline-offset: 2px;
}

/* Custom utility classes */
.text-youtube {
    color: #ff0000;
}

.bg-youtube {
    background-color: #ff0000;
}

.border-youtube {
    border-color: #ff0000;
}

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

/* Error and success states */
.error-state {
    border-color: #ef4444;
    background-color: #fef2f2;
}

.success-state {
    border-color: #10b981;
    background-color: #f0fdf4;
}

/* Loading spinner */
.spinner {
    width: 2rem;
    height: 2rem;
    border: 2px solid #f3f4f6;
    border-top: 2px solid #ff0000;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Tooltip styles */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #1f2937;
    color: white;
    padding: 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.tooltip:hover::after {
    opacity: 1;
}

/* Badge styles */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: #ff0000;
    color: white;
}

.badge-secondary {
    background: #6b7280;
    color: white;
}

.badge-success {
    background: #10b981;
    color: white;
}

/* Prose styles for content sections */
.prose {
    max-width: 65ch;
}

.prose h2 {
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.2;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.prose h3 {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.prose p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.prose ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.prose li {
    margin-bottom: 0.5rem;
}

/* Dark mode prose styles */
.dark .prose h2,
.dark .prose h3 {
    color: #f9fafb;
}

.dark .prose p {
    color: #d1d5db;
}