:root {
    --bg-color: hsl(225, 15%, 8%);
    --surface-color: hsl(225, 15%, 12%);
    --surface-color-hover: hsl(225, 15%, 16%);
    --text-primary: hsl(210, 40%, 98%);
    --text-secondary: hsl(210, 20%, 70%);
    --accent-color: hsl(0, 0%, 90%);
    --accent-hover: hsl(0, 0%, 100%);
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
    
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 4rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(18, 19, 23, 0.8);
    backdrop-filter: blur(12px);
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* Buttons */
.btn-primary, .btn-secondary {
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 4rem;
    padding-top: 5rem;
}

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

.hero h1 {
    font-family: var(--font-display);
    font-size: 4.5rem;
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeUp 1s var(--transition-smooth) forwards;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeUp 1s var(--transition-smooth) 0.2s forwards;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    opacity: 0;
    animation: fadeUp 1s var(--transition-smooth) 0.4s forwards;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 5rem 4rem;
}

.feature-card {
    background: var(--surface-color);
    padding: 2.5rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    transition: all var(--transition-smooth);
}

.feature-card:hover {
    background: var(--surface-color-hover);
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 1.25rem 2rem;
    }
    .hero {
        padding: 0 2rem;
        padding-top: 6rem;
    }
    .hero h1 {
        font-size: 3rem;
    }
    .features {
        padding: 4rem 2rem;
    }
}