* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f1f5f9;
    color: #1e293b;
    line-height: 1.6;
}

header {
    background: #15324f;
    color: white;
    padding: 48px 24px;
    text-align: center;
}

header h1 {
    margin: 0 0 12px;
    font-size: 36px;
}

header p {
    margin: 0;
}

main {
    max-width: 850px;
    margin: 32px auto;
    padding: 32px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px #00000012;
}

h2 {
    color: #15324f;
}

a {
    color: #0369a1;
}

.button,
button {
    display: inline-block;
    background: #0369a1;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    font: inherit;
    text-decoration: none;
    cursor: pointer;
}

.button:hover,
button:hover {
    background: #075985;
}

a:focus-visible,
button:focus-visible {
    outline: 3px solid #f59e0b;
    outline-offset: 4px;
}

nav {
    margin-bottom: 24px;
}

footer {
    padding: 20px;
    text-align: center;
    color: #475569;
}

@media (max-width: 600px) {
    main {
        margin: 16px;
        padding: 24px;
    }

    header h1 {
        font-size: 28px;
    }
}