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

body {
    background: #c9c9c9;
    font-family: 'Roboto Slab', serif;
    color: #333;
    overflow-x: hidden;
    line-height: 1.6;
}

:root {
    --rojo-principal: #D30F23;
    --rojo-oscuro: #A30B1B;
    --rojo-brillante: #E03143;
    --blanco: #ffffff;
    --gris-suave: #F2F0F1;
    --gris-claro: #E4E1E3;
    --texto-oscuro: #1F1B1C;
    --gris-texto: #6B6768;
}

/* ========= HERO SUPERIOR ========= */
.hero-fuentes {
    position: relative;
    width: 100%;
    margin-top: 65px;
    border-radius: 0;
    overflow: hidden;
    background: linear-gradient(135deg, var(--rojo-oscuro) 0%, var(--rojo-principal) 60%, var(--rojo-brillante) 100%);
    box-shadow: 0 8px 24px rgba(211,15,35,0.28);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px 30px 16px 30px;
    color: var(--blanco);
}

.hero-info {
    text-align: center;
    z-index: 2;
}

.hero-info h1 {
    font-family: 'Roboto Slab', serif;
    font-size: 2.3rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--blanco);
}

.hero-info .hero-subtitulo {
    display: block;
    font-family: 'Roboto Slab', serif;
    font-style: italic;
    font-size: 1rem;
    opacity: 0.85;
    margin-top: 4px;
    font-weight: 400;
}

/* ========= CONTENIDO ========= */
.contenedor {
    max-width: 1100px;
    margin: 0 auto 80px auto;
    padding: 18px 20px 0 20px;
}

.intro-texto {
    font-size: 1.05rem;
    color: var(--gris-texto);
    text-align: center;
    margin-bottom: 30px;
}

.titulo-seccion {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 30px 0 16px 0;
    font-family: 'Roboto Slab', serif;
    color: var(--texto-oscuro);
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.titulo-seccion::before {
    content: "";
    display: inline-block;
    width: 10px;
    height: 28px;
    border-radius: 3px;
    background: linear-gradient(180deg, var(--rojo-oscuro), var(--rojo-principal));
    flex-shrink: 0;
}

.seccion {
    background: var(--blanco);
    border-radius: 14px;
    padding: 26px;
    margin-bottom: 22px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.10);
}

.seccion p {
    font-size: 0.93rem;
    color: var(--texto-oscuro);
    margin-bottom: 6px;
}

.bloque-credito {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}

.bloque-credito .icono-svg {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
}

.bloque-credito h3 {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--rojo-principal);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nombre-autor {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--texto-oscuro);
    margin-bottom: 4px;
}

/* ========= TABLA ========= */
.tabla-fuentes {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    font-size: 0.9rem;
}

.tabla-fuentes th {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--blanco);
    background: linear-gradient(135deg, var(--rojo-oscuro), var(--rojo-principal));
    text-align: left;
    padding: 12px 15px;
    letter-spacing: 0.5px;
}

.tabla-fuentes th:first-child { border-radius: 8px 0 0 0; }
.tabla-fuentes th:last-child { border-radius: 0 8px 0 0; }

.tabla-fuentes td {
    padding: 10px 15px;
    border-bottom: 1px solid var(--gris-claro);
    vertical-align: top;
}

.tabla-fuentes tr:hover td { background: var(--gris-suave); }

.tabla-fuentes td a {
    color: var(--rojo-principal);
    text-decoration: none;
    font-weight: 600;
}

.tabla-fuentes td a:hover { text-decoration: underline; }

.tabla-fuentes td.col-cientifico {
    font-style: italic;
    color: var(--gris-texto);
    min-width: 200px;
}

.tabla-fuentes td.col-videoid {
    min-width: 175px;
    word-break: break-all;
    font-family: monospace;
    font-size: 0.82rem;
}

.nota {
    font-size: 0.82rem;
    color: var(--gris-texto);
    margin-top: 14px;
    font-style: italic;
}

/* ========= RESPONSIVE ========= */
@media (max-width: 768px) {
    .hero-info h1 { font-size: 1.6rem; }
    .seccion { padding: 20px; }
    .bloque-credito { flex-direction: column; align-items: center; text-align: center; }
    .tabla-fuentes { display: block; overflow-x: auto; }
    .tabla-fuentes td { font-size: 0.78rem; padding: 8px 6px; }
    .tabla-fuentes td.col-cientifico { min-width: 140px; }
    .tabla-fuentes td.col-videoid { min-width: 115px; }
}

*, *::before, *::after {
    font-family: 'Roboto Slab', serif !important;
}