* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    color: #172033;
}

.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

.site-header {
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
}

.nav {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    font-size: 22px;
    font-weight: 700;
    text-decoration: none;
    color: #146ef5;
}

nav {
    display: flex;
    gap: 18px;
}

nav a {
    text-decoration: none;
    color: #172033;
}

main {
    padding: 50px 0;
}

form {
    max-width: 650px;
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 5px 25px rgba(0,0,0,.06);
}

label {
    display: block;
    margin: 15px 0 7px;
    font-weight: 600;
}

input,
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 1px solid #d7dce5;
    border-radius: 7px;
    font: inherit;
}

textarea {
    min-height: 130px;
    resize: vertical;
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 20px;
    border: 0;
    border-radius: 7px;
    background: #146ef5;
    color: white;
    text-decoration: none;
    cursor: pointer;
}

.card {
    background: white;
    padding: 20px;
    margin: 20px 0;
    border-radius: 12px;
}

.site-footer {
    padding: 30px 0;
    margin-top: 50px;
    background: #172033;
    color: white;
}

@media (max-width: 700px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 15px 0;
    }

    nav {
        flex-wrap: wrap;
    }
}