body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0b1a2b;
    color: white;
}

.topbar {
    background: #111827;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 30px;
    font-weight: bold;
    color: #00aaff;
    letter-spacing: 1px;
}

nav a {
    margin-left: 20px;
    color: white;
    text-decoration: none;
}

.hero {
    text-align: center;
    padding: 90px 20px 60px;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 12px;
}

.hero p {
    font-size: 20px;
    color: #d1d5db;
}

.main-btn {
    display: inline-block;
    margin-top: 25px;
    padding: 14px 28px;
    background: #00aaff;
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
}

.cards {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 40px;
    flex-wrap: wrap;
}

.card {
    background: #16283a;
    padding: 30px;
    border-radius: 14px;
    width: 280px;
    text-align: center;
}