* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #222;
    background: #f7f7f7;
}

.container {
    width: min(1100px, calc(100% - 40px));
    margin: auto;
}

header {
    background: #fff;
    border-bottom: 1px solid #ddd;
}

header .container {
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 21px;
    font-weight: 700;
    color: #222;
    text-decoration: none;
}

nav a {
    margin-left: 24px;
    color: #555;
    text-decoration: none;
}

.hero {
    background: #e9eef3;
    padding: 80px 0;
}

.hero h1 {
    font-size: 42px;
    margin: 0 0 15px;
}

.hero p {
    max-width: 650px;
    font-size: 19px;
}

.content {
    padding: 55px 0;
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

article {
    background: #fff;
    padding: 25px;
    border: 1px solid #ddd;
}

footer {
    padding: 30px 0;
    background: #fff;
    border-top: 1px solid #ddd;
}

footer a,
footer span {
    margin-right: 20px;
    color: #666;
}

@media (max-width: 700px) {
    header .container {
        display: block;
        padding: 15px 0;
    }

    nav a {
        margin: 0 15px 0 0;
    }

    .hero h1 {
        font-size: 32px;
    }

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