:root {
    --primary: #4f46e5;
    --dark: #111827;
    --light: #f9fafb;
    --gray: #6b7280;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, sans-serif;
}

body {
    background: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

/* Flex */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

/* Navbar */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 10%;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

nav h1 {
    color: var(--primary);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
}

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

/* Hero */
.hero {
    text-align: center;
    padding: 100px 20px;
}

.hero h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
}

.hero p {
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto 30px;
}

.btn:hover {
    background: #4338ca;
}

/* Footer */
footer {
    padding: 40px 10%;
    text-align: center;
    background: var(--dark);
    color: white;
}

footer p {
    font-size: 0.9rem;
    color: #d1d5db;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }

    nav {
        flex-direction: column;
        gap: 10px;
    }
}