body {
    font-family: system-ui, sans-serif;
    max-width: 960px;
    margin: 2rem auto;
    padding: 0 1rem;
    color: #1c1c1c;
}

h1 {
    font-size: 1.5rem;
}

form .field {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    max-width: 420px;
}

label {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

input {
    padding: 0.4rem;
    font-size: 1rem;
}

button {
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
    font-size: 0.9rem;
}

th, td {
    border: 1px solid #ccc;
    padding: 0.35rem 0.5rem;
    text-align: left;
}

th {
    background: #f0f0f0;
}

.warnings {
    background: #fff6e0;
    border: 1px solid #e0c060;
    border-radius: 4px;
    padding: 0.75rem 1rem;
    margin: 1rem 0;
}

.error {
    background: #fdecea;
    border: 1px solid #e08c86;
    border-radius: 4px;
    padding: 0.75rem 1rem;
    margin: 1rem 0;
    white-space: pre-wrap;
}

.summary {
    margin: 1rem 0;
}

iframe {
    display: block;
    margin: 1rem 0;
}