/* 
   Tiny Little Lab - Premium Design System 
   Aesthetic: Clean, Scientific, Premium, Intelligent
*/

:root {
    /* Color Palette */
    --bg-color: #0F1115;       /* Deep Slate/Charcoal - Lab feel */
    --bg-secondary: #161920;   /* Slightly lighter for cards */
    --text-primary: #F0F2F5;   /* Off-white for readability */
    --text-secondary: #94A3B8; /* Muted gray for body text */
    --accent-primary: #3B82F6; /* Science Blue */
    --accent-glow: rgba(59, 130, 246, 0.4);
    
    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #E2E8F0 0%, #94A3B8 100%);
    --gradient-accent: linear-gradient(135deg, #60A5FA 0%, #3B82F6 100%);

    /* Typography */
    --font-heading: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;
    --font-body: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', Consolas, monospace;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;
    --border-radius: 12px;
    
    /* Animation */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.2;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

img {
    max-width: 100%;
    display: block;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.mono {
    font-family: var(--font-mono);
    font-size: 0.9em;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.gradient-text {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: var(--spacing-md) 0;
    backdrop-filter: blur(12px);
    background: rgba(15, 17, 21, 0.8);
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

.logo span {
    color: var(--text-secondary);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.nav-links a:hover {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: 180px 0 100px;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
    filter: blur(80px);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
}

.hero-content h1 {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
}

/* Grid System */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
}

/* Project Cards */
.card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.project-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
    flex-grow: 1;
    margin-bottom: var(--spacing-md);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: auto;
}

.tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Footer */
footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* Blog Styles */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.blog-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.blog-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.1);
}

.blog-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.blog-meta .mono {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.blog-card h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.blog-card h2 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.blog-card h2 a:hover {
    color: var(--accent-primary);
}

.blog-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.read-more {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.read-more:hover {
    text-decoration: underline;
}

/* Newsletter CTA */
.cta-section {
    background: var(--bg-secondary);
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.cta-section h2 {
    margin-bottom: var(--spacing-sm);
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta-form {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 400px;
    margin: 0 auto;
}

.cta-form input {
    flex: 1;
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.cta-form input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.btn-primary {
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    background: var(--accent-primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary:hover {
    background: #2563eb;
}

/* Active nav link */
.nav-links a.active {
    color: var(--accent-primary);
}

@media (max-width: 768px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }
}