* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f7fb;
    color: #1f2937;
}

header {
    width: 100%;
    background: #28527a;
    color: white;
    text-align: center;
    padding: 0;
}

header .hero {
    margin: 0;
    width: 100%;
    max-width: none;
    padding: 2.5rem 1.5rem;
}

main, footer {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem;
}
.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1.5rem;
}
.button-group a {
    display: inline-block;
    text-decoration: none;
    padding: 0.9rem 1.6rem;
    border-radius: 999px;
    font-weight: 600;
}
.btn-primary {
    background: #3b82f6;
    color: white;
}
.btn-secondary {
    background: #e5e7eb;
    color: #1f2937;
}
section {
    margin-top: 2rem;
    line-height: 1.75;
}
h1, h2 {
    margin: 0;
}
.cards {
    display: grid;
    gap: 1.2rem;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    margin-top: 1.5rem;
}
.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
    padding: 1.4rem;
}
footer {
    text-align: center;
    color: #4b5563;
    margin-top: 2rem;
    font-size: 0.95rem;
}

@media (max-width: 720px) {
    header, main, footer {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .button-group {
        flex-direction: column;
        align-items: stretch;
    }

    .button-group a {
        width: 100%;
        text-align: center;
    }

    .cards {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2rem;
    }
}