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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-light: #f1f5f9;
    --text-muted: #94a3b8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: var(--bg-card);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
}

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

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s;
}

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

.hero {
    text-align: center;
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1e293b 100%);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.3s;
}

.cta-button:hover {
    background: var(--primary-dark);
}

.principles {
    padding: 4rem 0;
    background: var(--bg-card);
}

.principles h2, .features h2, .examples h2, .platforms h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.principle-card {
    background: var(--bg-dark);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: transform 0.3s, border-color 0.3s;
}

.principle-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.principle-card h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.features {
    padding: 4rem 0;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(99, 102, 241, 0.1);
}

.feature h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.examples {
    padding: 4rem 0;
    background: var(--bg-card);
}

.example-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.example-card {
    background: var(--bg-dark);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.example-card code {
    color: var(--text-light);
    font-size: 0.95rem;
}

.platforms {
    padding: 4rem 0;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.platform {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
}

.platform h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.platform ul {
    list-style: none;
}

.platform li {
    padding: 0.5rem 0;
    color: var(--text-muted);
}

footer {
    background: var(--bg-card);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid rgba(99, 102, 241, 0.2);
    margin-top: 4rem;
}

footer p {
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .principles-grid, .features-list, .example-cards {
        grid-template-columns: 1fr;
    }
}