:root {
    --primary: #2563eb;
    --secondary: #06d6a0;
    --accent: #ef4444;
    --link-color: #8b5cf6;
    --dark: #1e293b;
    --light: #ffffff;
    --surface: #ffffff;
    --surface-hover: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary), #3b82f6);
    --gradient-accent: linear-gradient(135deg, var(--link-color), #a855f7);
    --gradient-light: linear-gradient(135deg, #f8fafc, #ffffff);
    --gradient-subtle: linear-gradient(135deg, #f1f5f9, #f8fafc);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);
}

/* Modern CSS Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background: var(--gradient-light);
    color: var(--text-primary);
    min-height: 100vh;
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enhanced Header */
header {
    background: var(--gradient-subtle);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
    margin-bottom: -3rem;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.03;
    z-index: -1;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    animation: slideUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Enhanced Navigation */
nav {
    background: rgba(255, 255, 255, 0.95);
    padding: var(--space-sm);
    position: sticky;
    top: 0;
    box-shadow: var(--shadow-md);
    z-index: 1000;
    backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.search-box {
    background: rgba(255, 255, 255, 0.8);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border);
    flex: 1;
    max-width: 400px;
    box-shadow: var(--shadow-sm);
}

.search-box:focus-within {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.search-box input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    outline: none;
    width: 100%;
    font-size: 0.95rem;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

/* Enhanced Container */
.container {
    max-width: 1400px;
    margin: var(--space-xl) auto;
    padding: 0 var(--space-lg);
}

/* Modern Category Filter */
.category-filter {
    display: flex;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
    flex-wrap: wrap;
    justify-content: center;
}

.category-btn {
    padding: var(--space-xs) var(--space-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    cursor: pointer;
    color: var(--text-secondary);
    background: var(--surface);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.category-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left 0.3s ease;
    z-index: -1;
}

.category-btn:hover::before,
.category-btn.active::before {
    left: 0;
}

.category-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

.category-btn:hover,
.category-btn.active {
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.category-btn.active {
    font-weight: 600;
}

/* Enhanced Download Grid */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
}

/* Modern Download Card */
.download-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.download-card:hover::before {
    transform: scaleX(1);
}

.download-card:hover {
    background: var(--surface-hover);
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.card-icon {
    width: 56px;
    height: 56px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-md);
    display: grid;
    place-items: center;
    color: var(--primary);
    font-size: 1.5rem;
    flex-shrink: 0;
    transition: all 0.3s ease;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.download-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    background: rgba(37, 99, 235, 0.15);
}

.download-stats {
    display: flex;
    gap: var(--space-md);
    margin: var(--space-sm) 0;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: rgba(100, 116, 139, 0.08);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
}

/* Enhanced Download Button */
.download-button {
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
    justify-content: center;
    margin-top: auto;
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.download-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.download-button:hover::before {
    left: 100%;
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Link-specific styles for light theme */
.link-button {
    background: var(--gradient-accent) !important;
}

.link-button:hover {
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.3) !important;
}

.download-card[data-category="resources"] {
    border-color: var(--link-color);
}

.download-card[data-category="extensions"] {
    border-color: #4285f4;
}

/* Enhanced Floating Action Button */
.floating-download {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    background: var(--gradient-primary);
    color: white;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    display: grid;
    place-items: center;
    box-shadow: var(--shadow-glow);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    border: none;
    font-size: 1.5rem;
}

.floating-download:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 0 30px rgba(37, 99, 235, 0.4);
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Scrollbar Styling for Light Theme */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Enhanced Responsive Design */
@media (max-width: 1200px) {
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .nav-container {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .search-box {
        max-width: 100%;
        order: 3;
    }
    
    header {
        padding: var(--space-lg) var(--space-md);
        margin-bottom: -2rem;
    }
    
    .container {
        padding: 0 var(--space-md);
        margin: var(--space-lg) auto;
    }
    
    .floating-download {
        bottom: var(--space-md);
        right: var(--space-md);
        width: 56px;
        height: 56px;
    }
}

@media (max-width: 480px) {
    .category-filter {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: var(--space-xs);
    }
    
    .category-btn {
        flex-shrink: 0;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Light mode optimizations */
@media (prefers-color-scheme: light) {
    :root {
        color-scheme: light;
    }
}

/* Optional: Add a subtle pattern to the background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(37, 99, 235, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(6, 214, 160, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}