* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f7f9;
    color: #2c3e50;
    line-height: 1.6;
}

.header {
    padding: 20px 40px;
    font-size: 20px;
    font-weight: 700;
    background: #f5f7f9;
}

.form-box {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

input[type="text"] {
    width: 280px;
    padding: 13px 14px;
    font-size: 16px;
    border: 1px solid #c7d0d8;
    border-radius: 7px;
    background: #ffffff;
    color: #2c3e50;
}

input[type="text"]:focus {
    outline: 2px solid #2c5d73;
    outline-offset: 2px;
}

button {
    padding: 13px 24px;
    font-size: 16px;
    background: #2c5d73;
    color: #ffffff;
    border: 0;
    border-radius: 22px;
    cursor: pointer;
}

button:hover {
    background: #234b5c;
}

.footer {
    padding: 40px 20px;
    background: #0f2f2a;
    color: #ffffff;
    text-align: center;
}

.footer strong {
    font-size: 18px;
}

@media (max-width: 600px) {
    .header {
        padding: 18px 20px;
        font-size: 18px;
    }

    .form-box {
        flex-direction: column;
    }

    input[type="text"],
    button {
        width: 100%;
        max-width: 340px;
    }
}