* { box-sizing: border-box; }

html {
    min-height: 100%;
    background: #f2f4f7;
    color: #172033;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    margin: 0;
    padding: 32px 16px;
}

.card {
    width: min(100%, 1050px);
    margin: 0 auto;
    padding: 24px;
    background: #fff;
    border-radius: 14px;
    box-shadow: 0 8px 30px rgba(0,0,0,.10);
}

.card.narrow {
    max-width: 600px;
}

h1 {
    margin-top: 0;
}

video {
    display: block;
    width: 100%;
    max-height: 75vh;
    background: #000;
}

label, input, button {
    display: block;
    width: 100%;
}

input {
    margin: 8px 0 16px;
    padding: 12px;
    font-size: 1rem;
}

button {
    padding: 12px;
    font-size: 1rem;
    cursor: pointer;
}

.error {
    color: #a40000;
    font-weight: bold;
}

.small {
    font-size: .9rem;
}