:root {
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-muted: #95a5a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-accent: #ecf0f1;
    --border-color: #e1e8ed;
    --accent-color: #3498db;
    --error-color: #e74c3c;
    
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    --container-width: 800px;
    --line-height: 1.7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: var(--line-height);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-weight: 300;
}

/* Navigation */
.site-nav {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-title {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.2s ease;
}

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

/* Main Content */
.site-content {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 200px);
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h2 {
    font-size: 1.8rem;
    font-weight: 400;
    line-height: 1.3;
    margin: 2rem 0 1rem 0;
    color: var(--text-primary);
}

h3 {
    font-size: 1.3rem;
    font-weight: 500;
    margin: 1.5rem 0 0.75rem 0;
    color: var(--text-primary);
}

p {
    margin-bottom: 1.5rem;
    font-weight: 300;
}

strong {
    font-weight: 500;
    color: var(--text-primary);
}

em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Links */
a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

a:hover {
    border-bottom-color: var(--accent-color);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-radius: 8px;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

/* Article Grid */
.article-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.article-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.article-title {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.article-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

/* Article & Page Content Images */
.site-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

/* Code blocks */
code {
    font-family: var(--font-mono);
    background: var(--bg-accent);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
}

pre {
    background: var(--bg-accent);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1rem 0;
}

pre code {
    background: none;
    padding: 0;
}

/* 404 Error styling */
.error-404 {
    text-align: center;
    padding: 4rem 2rem;
}

.error-code {
    font-family: var(--font-mono);
    font-size: 8rem;
    font-weight: 300;
    color: var(--error-color);
    line-height: 1;
    margin-bottom: 1rem;
}

/* Footer */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    margin-top: 4rem;
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 0.5rem;
    color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1.5rem;
    }
    
    .site-content {
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .error-code {
        font-size: 4rem;
    }
}

/* Loading animation for atmospheric effect */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 2s ease-in-out infinite;
}

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

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