body {
    margin: 0;
    font-family: "Helvetica Neue", Arial;
    color: #111;
    background: #fff;
}

.hero {
    height: 100vh;
    background: #0b1c2c;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.section {
    padding: 80px 20px;
    max-width: 900px;
    margin: auto;
    text-align: center;
}

.dark {
    background: #f4f6f8;
}

h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

h2 {
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 24px;
    background: black;
    color: white;
    text-decoration: none;
}