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

body {
    line-height: 1.6;
    color: #333;
}

header {
    background: linear-gradient(to right, #0077b6, #00b4d8);
    color: white;
    padding: 80px 20px;
    text-align: center;
}

header .btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 25px;
    background: white;
    color: #0077b6;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
}

nav {
    background: #023e8a;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav ul li {
    margin: 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.section {
    padding: 60px 20px;
}

.bg-light {
    background: #f4f4f4;
}

.bg-dark {
    background: #03045e;
    color: white;
}

.container {
    max-width: 1100px;
    margin: auto;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.bg-dark .card {
    background: #0077b6;
}

footer {
    text-align: center;
    padding: 20px;
    background: #001d3d;
    color: white;
}