:root {
    --bg-base: #050505;
    --bg-surface: #121212;
    --bg-surface-hover: #1a1a1a;
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #262626;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

.navbar {
    border-bottom: 1px solid var(--border);
    background-color: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

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

main {
    flex: 1;
}

.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8rem 2rem 4rem;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 1.5rem;
}

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

.app-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.app-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.2s ease, background-color 0.2s ease;
    display: flex;
    flex-direction: column;
}

.app-card:hover {
    transform: translateY(-4px);
    background-color: var(--bg-surface-hover);
}

.app-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.app-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.5rem;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.app-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    flex: 1;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-base);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    text-align: center;
    display: inline-block;
}

.btn-primary:hover {
    background-color: #d4d4d4;
}

.document-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.document-header {
    margin-bottom: 4rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.document-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

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

.document-content h2 {
    font-size: 1.25rem;
    margin: 2.5rem 0 1rem;
    color: var(--text-primary);
}

.document-content p, 
.document-content ul {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.document-content ul {
    padding-left: 1.5rem;
}

.document-content li {
    margin-bottom: 0.5rem;
}

footer {
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero {
        padding: 4rem 2rem 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}