:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #06b6d4;
    --accent-hover: #0891b2;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--bg-secondary);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    text-decoration: none;
}

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

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    flex: 1;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 6rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

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

.pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 6rem;
}

.pillar {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.pillar-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.pillar h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.pillar p {
    color: var(--text-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 6rem;
}

.project-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(6, 182, 212, 0.1);
}

.project-card .tag {
    display: inline-block;
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.cta {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-secondary);
    border-radius: 16px;
    margin-bottom: 6rem;
}

.cta h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.cta p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: var(--bg-primary);
    padding: 0.75rem 2rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s;
}

.btn:hover {
    background: var(--accent-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    margin-left: 1rem;
}

.btn-outline:hover {
    background: var(--accent);
    color: var(--bg-primary);
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--bg-secondary);
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 0.5rem;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

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

    .hero h1 {
        font-size: 2rem;
    }

    nav ul {
        gap: 1rem;
    }

    .cta {
        padding: 3rem 1.5rem;
    }

    .btn-outline {
        margin-left: 0;
        margin-top: 0.75rem;
    }
}