/* === CSS Variables === */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --accent-primary: #0066ff;
    --accent-secondary: #0052cc;
    --accent-light: #e6f0ff;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --border-color: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-hover: #f8f9fa;
}

/* === Base Styles === */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 60px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    opacity: 0.1;
    z-index: 0;
}

/* Falling elements animation - FIXED WITH RANDOM POSITIONS */
.falling-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
    pointer-events: none;
}

.falling-set {
    position: absolute;
    top: -150px;
    left: 0;
    width: 100%;
    height: 150px;
    animation: fall 10s linear infinite;
}

@keyframes fall {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(calc(100vh + 300px));
    }
}

.falling-element {
    position: absolute;
    font-size: 3rem;
    font-weight: bold;
    display: inline-block;
    animation: rotate 3s linear infinite;
}

.falling-element.bracket {
    color: #5B21B6;
    font-family: 'JetBrains Mono', monospace;
    opacity: 0.0;
    text-shadow: 2px 2px 4px rgba(91, 33, 182, 0.2);
}

.falling-element.apple {
    font-size: 3.5rem;
    opacity: 0.0;
    filter: drop-shadow(2px 2px 4px rgba(255, 0, 0, 0.2));
}

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

/* Random positions for each falling element */
.falling-set:nth-child(1) .falling-element:nth-child(1) { left: 5%; }
.falling-set:nth-child(1) .falling-element:nth-child(2) { left: 42%; }
.falling-set:nth-child(1) .falling-element:nth-child(3) { left: 78%; }
.falling-set:nth-child(1) .falling-element:nth-child(4) { left: 23%; }

.falling-set:nth-child(2) .falling-element:nth-child(1) { left: 67%; }
.falling-set:nth-child(2) .falling-element:nth-child(2) { left: 15%; }
.falling-set:nth-child(2) .falling-element:nth-child(3) { left: 89%; }
.falling-set:nth-child(2) .falling-element:nth-child(4) { left: 35%; }

.falling-set:nth-child(3) .falling-element:nth-child(1) { left: 28%; }
.falling-set:nth-child(3) .falling-element:nth-child(2) { left: 73%; }
.falling-set:nth-child(3) .falling-element:nth-child(3) { left: 11%; }
.falling-set:nth-child(3) .falling-element:nth-child(4) { left: 54%; }

.falling-set:nth-child(4) .falling-element:nth-child(1) { left: 82%; }
.falling-set:nth-child(4) .falling-element:nth-child(2) { left: 38%; }
.falling-set:nth-child(4) .falling-element:nth-child(3) { left: 61%; }
.falling-set:nth-child(4) .falling-element:nth-child(4) { left: 19%; }

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 60px 20px;
    z-index: 2;
    position: relative;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 0 0 20px;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-subtitle {
    display: block;
    font-size: 0.4em;
    font-weight: 400;
    opacity: 0.8;
    margin-bottom: 10px;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.hero-badges {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 24px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: transform 0.2s ease;
}

.badge:hover {
    transform: translateY(-2px);
}

.badge-open {
    background-color: var(--accent-light);
    color: var(--accent-primary);
}

.badge-free {
    background-color: #d4edda;
    color: #155724;
}

.badge-browser {
    background-color: #fff3cd;
    color: #856404;
}

/* === Main Container === */
.home-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px 60px;
}

/* === Section Styles === */
.featured-section {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin: 0 0 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.highlight-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.2s ease;
}

.highlight-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* === Grid Layout === */
.simulations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 30px;
}

/* === Card Styles === */
.simulation-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.simulation-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    flex: 1;
}

.card-image-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 15px;
    background: linear-gradient(to bottom, rgba(0,0,0,0.7) 0%, transparent 100%);
}

.card-category {
    display: inline-block;
    background: rgba(255,255,255,0.9);
    color: #333;
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 12px;
    color: var(--text-primary);
}

.card-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}

/* === Card Meta === */
.card-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    gap: 12px;
}

.meta-author {
    font-size: 0.875rem;
    color: var(--text-secondary);
    flex-grow: 1;
}

.meta-author a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
}

.meta-author a:hover {
    color: var(--accent-primary);
}

.meta-updated {
    font-size: 0.8rem;
    color: var(--text-secondary);
    width: 100%;
    order: 3; /* Places it on the next line */
    text-align: left;
    margin-top: 4px;
    text-decoration: none;
    transition: color 0.2s ease;
    display: inline-flex;
    align-items: center;
}

.meta-updated:hover {
    color: var(--accent-primary);
    text-decoration: underline;
}

.meta-updated i {
    margin-right: 6px;
}

.meta-actions {
    display: flex;
    gap: 8px;
}

.action-button {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.action-button:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* === Responsive Design === */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .simulations-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .falling-element {
        font-size: 2.5rem;
    }
    
    .falling-element.apple {
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    .hero-content {
        padding: 40px 20px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-badges {
        gap: 10px;
    }
    
    .badge {
        font-size: 0.75rem;
        padding: 6px 12px;
    }
    
    .card-body {
        padding: 16px;
    }
    
    .card-meta {
        padding: 12px 16px;
    }
    
    .falling-element {
        font-size: 2rem;
    }
    
    .falling-element.apple {
        font-size: 2.5rem;
    }
}