:root {
    --color-texto: #212529;
    --color-texto-secundario: #5a5a5a;
    --color-fondo: #f7f5f0;
    --color-superficie: #ffffff;
    --color-borde: #ded9cc;
    --color-acento: #00695c;
    --color-acento-oscuro: #0d3d37;
    --color-ambar: #b8860b;
    --color-rojo: #c62828;
    --radio: 10px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 2.5rem 1.5rem 4rem;
    background: var(--color-fondo);
    color: var(--color-texto);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.65;
}

.contenedor {
    max-width: 700px;
    margin: 0 auto;
}

.marca {
    display: inline-block;
    font-family: Georgia, 'Times New Roman', serif;
    font-weight: 700;
    font-size: 1.85rem;
    letter-spacing: 0.01em;
    color: var(--color-acento);
    margin: 0 0 1.75rem;
}

.marca a {
    color: inherit;
}

h1, h2 {
    font-family: Georgia, 'Times New Roman', serif;
    color: var(--color-texto);
    line-height: 1.25;
}

h1 {
    font-size: 1.75rem;
    margin: 0 0 0.75rem;
}

h2 {
    font-size: 1.25rem;
    margin: 2rem 0 0.75rem;
}

p.ayuda {
    color: var(--color-texto-secundario);
    font-size: 0.95rem;
}

a {
    color: var(--color-acento);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

details {
    background: var(--color-superficie);
    border: 1px solid var(--color-borde);
    border-radius: var(--radio);
    margin-bottom: 0.75rem;
    padding: 0 1.1rem;
    transition: border-color 0.15s ease;
}

details[open] {
    border-color: var(--color-acento);
}

summary {
    list-style: none;
    cursor: pointer;
    padding: 1rem 0;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

summary::-webkit-details-marker {
    display: none;
}

summary::before {
    content: '▶';
    color: var(--color-acento);
    display: inline-block;
    transition: transform 0.15s ease;
    font-size: 1.05em;
    line-height: 1;
}

details[open] summary::before {
    transform: rotate(90deg);
}

details > *:not(summary) {
    padding-bottom: 1.1rem;
}

fieldset {
    border: none;
    border-top: 1px solid var(--color-borde);
    padding: 0.9rem 0 0.2rem;
    margin: 0 0 0.5rem;
}

legend {
    padding: 0 0 0.5rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-texto-secundario);
    font-weight: 600;
}

label {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.3rem 0;
    cursor: pointer;
}

input[type="checkbox"],
input[type="radio"] {
    accent-color: var(--color-acento);
    width: 1.05rem;
    height: 1.05rem;
    flex-shrink: 0;
}

input[type="text"] {
    font: inherit;
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--color-borde);
    border-radius: 6px;
    background: var(--color-fondo);
    width: 100%;
    max-width: 320px;
}

input:focus-visible {
    outline: 2px solid var(--color-acento);
    outline-offset: 1px;
}

button[type="submit"] {
    font: inherit;
    font-weight: 600;
    background: var(--color-acento);
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
}

button[type="submit"]:hover {
    background: var(--color-acento-oscuro);
}

textarea {
    width: 100%;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.85rem;
    padding: 0.75rem;
    border: 1px solid var(--color-borde);
    border-radius: 8px;
    background: var(--color-superficie);
    color: var(--color-texto);
}

.encabezado {
    text-align: center;
    background: var(--color-superficie);
    border: 1px solid var(--color-borde);
    border-radius: 18px;
    padding: 2.25rem 1.75rem 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 16px rgba(33, 37, 41, 0.06);
}

.encabezado h1 {
    margin-bottom: 1.5rem;
}

.encabezado img {
    margin-bottom: 1.5rem;
}

.encabezado p {
    margin: 0 auto;
    max-width: 520px;
}

.sello-preview {
    display: flex;
    justify-content: center;
    margin: 1.75rem 0;
}

.sello-preview .marco {
    display: inline-flex;
    background: #fff;
    border: 1px solid var(--color-borde);
    border-radius: 18px;
    padding: 1.25rem;
    box-shadow: 0 4px 16px rgba(33, 37, 41, 0.08);
}

.sello-preview img {
    display: block;
}

.aviso {
    border-left: 4px solid var(--color-ambar);
    background: #fdf6e3;
    padding: 0.9rem 1.1rem;
    border-radius: 6px;
    margin: 1.25rem 0;
}

.aviso-error {
    border-left-color: var(--color-rojo);
    background: #fdecea;
}

ul {
    padding-left: 1.3rem;
}

li {
    margin-bottom: 0.5rem;
}