body {
    font-family: system-ui, -apple-system, sans-serif;
    margin: 0;
    color: #222;
    background: #fafafa;
}

main {
    max-width: 480px;
    margin: 0 auto;
    padding: 1rem;
}

h1 {
    font-size: 1.2rem;
    margin: 0.5rem 0 1rem;
}

h2 {
    font-size: 1rem;
    margin: 1.5rem 0 0.5rem;
}

.num {
    font-size: 2rem;
    letter-spacing: 0.05em;
    margin: 0.5rem 0;
}

input {
    font-size: 1rem;
    padding: 0.5rem;
    width: 100%;
    box-sizing: border-box;
    margin: 0.25rem 0 0.75rem;
}

button {
    font-size: 1rem;
    padding: 0.5rem 1rem;
}

.muted {
    color: #666;
}

.error {
    color: #b00020;
}

.dot {
    color: #888;
}

.qr {
    border: 1px dashed #999;
    padding: 1rem;
    text-align: center;
    color: #666;
    margin: 1rem 0;
}