* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 1.5rem;
    font-family: sans-serif;
    line-height: 1.6;
    color: #222;
    background: #fff;
}

header,
main {
    max-width: 1000px;
    margin: 0 auto;
}

header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1.5rem;
    margin-bottom: 1.5rem;
}

.heading {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem 1rem;
}

h1 {
    margin: 0;
    font-size: 1.8rem;
}

.page-title {
    font-size: 1.3rem;
    font-weight: bold;
}

form {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

select,
button {
    padding: 0.7rem;
    font: inherit;
}

select {
    width: 250px;
    max-width: 100%;
}

button {
    cursor: pointer;
}

iframe {
    display: block;
    width: 100%;
    height: 60vh;
    min-height: 350px;
    border: 1px solid #ccc;
}

@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .heading {
        align-items: baseline;
    }

    form {
        width: 100%;
    }

    select {
        flex: 1;
        min-width: 0;
        width: auto;
    }

    button {
        flex-shrink: 0;
    }
}