:root {
    --ink: #1a1a1a;
    --paper: #fdfdfb;
    --muted-ink: #4a4a4a;
    --border-color: #d1d1cf;
    --accent-red: #8b0000;
    --bg-texture: #f4f1ea;

    --font-serif: 'Libre Baskerville', serif;
    --font-sans: 'Montserrat', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-texture);
    color: var(--ink);
    font-family: var(--font-serif);
    line-height: 1.8;
    overflow-x: hidden;
}

.paper-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://www.transparenttextures.com/patterns/old-mathematics.png');
    opacity: 0.3;
    pointer-events: none;
    z-index: -1;
}

/* Navegación por pestañas */
.institutional-tabs {
    max-width: 850px;
    margin: 40px auto -41px;
    display: flex;
    gap: 5px;
    position: relative;
    z-index: 10;
    padding-left: 20px;
}

.tab-btn {
    background: #e9e9e5;
    border: 1px solid var(--border-color);
    border-bottom: none;
    padding: 12px 25px;
    font-family: var(--font-serif);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--muted-ink);
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
}

.tab-btn:hover {
    background: #f0f0ed;
    color: var(--ink);
}

.tab-btn.active {
    background: var(--paper);
    color: var(--ink);
    font-weight: 700;
    padding-bottom: 13px;
    margin-bottom: -1px;
    border-bottom: 1px solid var(--paper);
}

.letter-container {
    max-width: 850px;
    margin: 40px auto;
    background: var(--paper);
    padding: 80px 80px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    position: relative;
}

@media (max-width: 768px) {
    .letter-container {
        margin: 0;
        padding: 40px 20px;
    }

    .institutional-tabs {
        margin: 20px 0 -1px;
        padding-left: 10px;
    }

    .tab-btn {
        padding: 10px 15px;
        font-size: 0.8rem;
    }
}

.letter-header {
    margin-bottom: 40px;
    text-align: left;
}


.addressee {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0;
}

.subject {
    font-size: 1.1rem;
    color: var(--muted-ink);
}

.letter-title {
    font-size: 2.2rem;
    text-align: center;
    margin: 20px 0 50px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--ink);
    border-bottom: 2px solid var(--ink);
    padding-bottom: 25px;
    text-decoration: none;
}

.subtitle-text {
    display: block;
    font-size: 1.4rem;
    font-weight: 400;
    margin-top: 10px;
    color: var(--muted-ink);
}



p {
    margin-bottom: 1.5rem;
    text-align: justify;
    font-size: 1.05rem;
}

/* Secciones desplegables */
.collapsible-section {
    margin-bottom: 20px;
}

.toggle-trigger {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s;
    user-select: none;
}

.toggle-trigger:hover {
    color: var(--muted-ink);
    border-bottom-color: var(--ink);
}

.toggle-icon {
    font-size: 1.2rem;
    font-style: normal;
    transition: transform 0.3s ease;
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.5s ease-out, opacity 0.4s ease-out;
}

.collapsible-section.open .collapsible-content {
    max-height: 2000px;
    /* Suficiente para el contenido legal */
    opacity: 1;
    margin-top: 20px;
    transition: max-height 1s ease-in, opacity 0.6s ease-in;
}

.collapsible-section.open .toggle-icon {
    transform: rotate(45deg);
}

.legal-citation {
    margin: 25px 0;
    padding: 20px 30px;
    background: #f8f8f6;
    border-left: 3px solid var(--border-color);
    font-style: italic;
    font-size: 0.95rem;
    color: var(--muted-ink);
    line-height: 1.6;
}

.citation-source {
    display: block;
    margin-top: 15px;
    font-family: var(--font-sans);
    font-style: normal;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--muted-ink);
    opacity: 0.8;
}

/* Listas formatuadas */
.formal-demands {
    margin: 40px 0;
    list-style: decimal inside;
}

.formal-demands>li {
    margin-bottom: 2rem;
    font-weight: 700;
}

.sub-demands {
    margin: 20px 0 0 0px;
    /* Reducimos margen para compensar el padding */
    list-style-type: none;
    /* Quitamos el estilo por defecto */
    counter-reset: alphacounter;
    /* Iniciamos contador */
    font-weight: 400;
}

.sub-demands li {
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 35px;
}

.sub-demands li::before {
    content: counter(alphacounter, lower-alpha) ") ";
    counter-increment: alphacounter;
    position: absolute;
    left: 0;
    font-weight: 700;
}

/* Control de contenidos */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Sección de firmas */
.signature-section {
    margin-top: 80px;
    padding-top: 40px;
    border-top: 2px solid var(--ink);
}

.signature-card {
    background: #fdfdfd;
}

.form-title {
    font-family: var(--font-sans);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.form-disclaimer {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--muted-ink);
    border-left: 2px solid var(--border-color);
    padding-left: 15px;
}

.action-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin-top: 40px;
}

.classic-btn {
    background: var(--ink);
    color: white;
    border: none;
    padding: 18px;
    font-family: var(--font-sans);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    width: 100%;
}

.classic-btn:hover {
    background: #444;
    transform: translateY(-1px);
}

.security-note {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--muted-ink);
    display: flex;
    align-items: center;
    gap: 8px;
}

.signers-list {
    margin-top: 40px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

.signer-entry {
    padding: 12px 0;
    border-bottom: 1px dotted var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 20px;
}

.signer-name {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--ink);
}

.signer-institution {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--muted-ink);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.placeholder-entry {
    border-bottom: none;
    margin-top: 20px;
    background: #fdfdfd;
    padding: 20px;
    border: 1px dashed var(--border-color);
    text-align: center;
}

.placeholder-entry p {
    margin-bottom: 0;
    font-size: 0.9rem;
    font-style: italic;
    color: var(--muted-ink);
}

@media (min-width: 768px) {
    /* Mantenemos una columna para mayor solemnidad, pero se podría pasar a 1fr 1fr si hay muchos */
}

/* Estilo Wikipedia para notas al pie */
.wiki-footnote {
    position: relative;
    cursor: help;
    color: var(--accent-red);
    font-weight: 700;
    font-size: 0.8rem;
    padding: 0 2px;
}

.wiki-tooltip {
    visibility: hidden;
    position: absolute;
    bottom: 125%;
    /* Un poco más de espacio */
    left: -15px;
    /* Desplazamiento mínimo a la izquierda para evitar cortes */
    background: var(--paper);
    color: var(--ink);
    width: 300px;
    /* Ajustamos a un tamaño más manejable */
    padding: 15px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    font-family: var(--font-serif);
    font-size: 0.85rem;
    font-style: italic;
    font-weight: 400;
    line-height: 1.5;
    z-index: 100;
    opacity: 0;
    transition: opacity 0.3s, visibility 0.3s;
    pointer-events: auto;
    transform: none;
    /* Eliminamos el centrado que causaba el corte */
}

/* Puente invisible para evitar que desaparezca el tooltip al mover el ratón hacia él */
.wiki-footnote::after {
    content: "";
    position: absolute;
    bottom: 100%;
    left: 0;
    width: 100px;
    /* Suficiente para cubrir el área de hover */
    height: 30px;
}

/* Flecha del tooltip */
.wiki-tooltip::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 18px;
    /* Ajustada para apuntar al [*] */
    margin-left: 0;
    border-width: 8px;
    border-style: solid;
    border-color: var(--border-color) transparent transparent transparent;
}

.wiki-footnote:hover .wiki-tooltip {
    visibility: visible;
    opacity: 1;
}

.boe-link {
    color: var(--accent-red);
    text-decoration: underline;
    font-weight: 700;
    font-style: normal;
}

.boe-link:hover {
    color: var(--ink);
}

@media (max-width: 768px) {
    .wiki-tooltip {
        width: 250px;
        left: auto;
        right: -20px;
        transform: none;
    }

    .wiki-tooltip::after {
        left: auto;
        right: 25px;
    }
}

.simple-footer {
    text-align: center;
    padding: 60px 20px;
    font-size: 0.8rem;
    color: var(--muted-ink);
    opacity: 0.7;
    font-family: var(--font-sans);
}

/* Tablas de datos */
.table-container {
    overflow-x: auto;
    margin: 30px 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 20px;
}

.data-table th, .data-table td {
    border: 1px solid var(--border-color);
    padding: 12px 10px;
}

.data-table th {
    background-color: #f0f0ed;
    font-weight: 600;
    color: var(--ink);
}

.data-table td:first-child {
    text-align: left;
    font-weight: 500;
    background-color: #fcfcfc;
}