/* =========================================================
   Curso de Terapia Neural — Dr. Pablo R. Koval
   Estética minimalista, clean, pastel, formal.
   ========================================================= */

:root {
    /* Paleta pastel */
    --bg:           #f7f4ee;     /* crema marfil */
    --bg-alt:       #ffffff;     /* blanco */
    --bg-soft:      #efe9df;     /* arena clara */
    --accent-1:     #c9d8c5;     /* verde salvia pastel */
    --accent-2:     #d9c7b8;     /* nude/arena */
    --accent-3:     #b9c7d1;     /* azul niebla pastel */
    --accent-4:     #e3d6c1;     /* trigo pastel */

    --text:         #2b2e2a;     /* casi negro suave */
    --text-soft:    #555852;
    --text-muted:   #8a8a82;
    --line:         #e2dccf;     /* línea sutil */

    --serif:        'Cormorant Garamond', 'Times New Roman', Georgia, serif;
    --sans:         'Inter', 'Helvetica Neue', Arial, sans-serif;

    --max:          1100px;
    --gap:          2rem;
    --radius:       2px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color .2s ease;
}
a:hover {
    border-bottom-color: var(--text);
}

h1, h2, h3, h4 {
    font-family: var(--serif);
    font-weight: 500;
    color: var(--text);
    line-height: 1.25;
    margin: 0 0 .8em 0;
    letter-spacing: -0.01em;
    /* Evita palabras viudas en títulos */
    text-wrap: balance;
}

h1 { font-size: clamp(1.76rem, 4vw, 2.72rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
h3 { font-size: 1.25rem; font-family: var(--sans); font-weight: 600; letter-spacing: .02em; }
h4 { font-size: 1.05rem; font-family: var(--sans); font-weight: 600; letter-spacing: .03em; text-transform: uppercase; color: var(--text-soft); }

p {
    margin: 0 0 1.1em 0;
    color: var(--text-soft);
    /* Reduce palabras viudas en párrafos (navegadores compatibles) */
    text-wrap: pretty;
}

/* No partir palabras con guión al final de línea en todo el sitio */
html, body,
h1, h2, h3, h4, h5, h6,
p, li, dd, dt, blockquote, figcaption,
.lead, .eyebrow, .book-meta, .module, .card, .cat,
.prologue, .topic-list, .section-head, .page-head,
.hero, .nav-links, .site-footer {
    hyphens: none;
    -webkit-hyphens: none;
    -ms-hyphens: none;
    -moz-hyphens: none;
    overflow-wrap: break-word;
    word-break: normal;
}

/* Anti-orphan / widow control extra para citas y leads */
blockquote, .eyebrow, figcaption, .book-meta {
    text-wrap: pretty;
}

hr {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 3rem 0;
}

ul {
    padding-left: 1.2rem;
    margin: 0 0 1.2em 0;
}
ul li {
    margin-bottom: .35em;
    color: var(--text-soft);
}

blockquote {
    margin: 1.5rem 0;
    padding: 1.2rem 1.5rem;
    border-left: 3px solid var(--accent-1);
    background: var(--bg-soft);
    font-family: var(--serif);
    font-size: 1.15rem;
    color: var(--text);
    font-style: italic;
}
blockquote cite {
    display: block;
    margin-top: .8rem;
    font-size: .85rem;
    font-style: normal;
    font-family: var(--sans);
    color: var(--text-muted);
    letter-spacing: .04em;
    text-transform: uppercase;
}

/* ===========================
   Layout
   =========================== */
.container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.narrow {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 4.5rem 0;
}

section.tight {
    padding: 2.5rem 0;
}

.bg-soft   { background: var(--bg-soft); }
.bg-white  { background: var(--bg-alt); }

/* ===========================
   Navegación
   =========================== */
.site-header {
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.1rem 1.5rem;
    max-width: var(--max);
    margin: 0 auto;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: .9rem;
    color: var(--text);
    border: 0;
    line-height: 1.1;
}
.brand-mark {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
}
.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}
.brand-title {
    font-family: var(--serif);
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: .01em;
    color: var(--text);
}
.brand-sub {
    font-family: var(--sans);
    font-size: .65rem;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-top: 3px;
}

.nav-links {
    display: flex;
    gap: 1.6rem;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}
.nav-links a {
    font-size: .85rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-soft);
    border: 0;
    padding-bottom: 3px;
    border-bottom: 1px solid transparent;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
    border-bottom-color: var(--accent-1);
}

/* Toggle hamburguesa (oculto en escritorio, visible en mobile) */
.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 8px 10px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    width: 42px;
    height: 38px;
    line-height: 0;
    color: var(--text);
}
.nav-toggle:focus-visible {
    outline: 2px solid var(--accent-3);
    outline-offset: 2px;
}
.nav-toggle-bar {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--text);
    transition: transform .25s ease, opacity .2s ease;
}

/* ===========================
   Hero
   =========================== */
.hero {
    padding: 5rem 0 4.5rem;
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
    border-bottom: 1px solid var(--line);
}
.hero-inner {
    max-width: 820px;
    padding: 0 1.5rem;
    margin: 0 auto;
    text-align: left;
}
.hero-split {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 5fr 7fr;
    gap: 3.5rem;
    align-items: center;
}
@media (max-width: 900px) {
    .hero-split {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}
.hero-figure {
    margin: 0;
}
.hero-image {
    aspect-ratio: 3 / 4;
    width: 100%;
    overflow: hidden;
    border: 1px solid var(--line);
    background: var(--bg-soft);
}
.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    filter: saturate(.85);
}
.hero-caption {
    margin-top: .7rem;
    font-family: var(--serif);
    font-style: italic;
    font-size: .9rem;
    color: var(--text-muted);
    text-align: right;
    letter-spacing: .01em;
}
@media (max-width: 900px) {
    .hero-image { aspect-ratio: 4 / 3; max-height: 360px; }
    .hero-caption { text-align: left; }
}

/* ===========================
   Libros
   =========================== */
.book {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    align-items: start;
    margin-bottom: 4rem;
    padding-bottom: 4rem;
    border-bottom: 1px solid var(--line);
}
.book:last-child {
    border-bottom: 0;
    margin-bottom: 0;
    padding-bottom: 0;
}
@media (max-width: 800px) {
    .book {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}
.book-cover {
    background: var(--bg-soft);
    border: 1px solid var(--line);
    overflow: hidden;
    aspect-ratio: 3 / 4;
}
.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.book-info h2 {
    margin-bottom: .3rem;
}
.book-meta {
    font-size: .8rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1.4rem;
}
.book-info p {
    font-size: 1rem;
}
.book-prologue-head {
    font-size: .75rem;
    letter-spacing: .25em;
    text-transform: uppercase;
    color: var(--text-soft);
    margin: 1.8rem 0 .8rem;
    padding-top: 1.4rem;
    border-top: 1px solid var(--line);
}
.book-info ul.book-prologues {
    list-style: none;
    padding: 0;
    margin: 0;
}
.book-info ul.book-prologues li {
    padding: .4rem 0;
}
.book-info ul.book-prologues a {
    font-family: var(--serif);
    font-size: 1.05rem;
    color: var(--text);
    border-bottom-color: var(--line);
}
.book-info ul.book-prologues a:hover {
    border-bottom-color: var(--text);
}
.hero .eyebrow {
    font-size: .8rem;
    letter-spacing: .35em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}
.hero h1 {
    margin-bottom: 1.2rem;
}
.hero .lead {
    font-family: var(--serif);
    font-size: 1.35rem;
    color: var(--text-soft);
    line-height: 1.5;
    max-width: 680px;
}
.hero .meta {
    margin-top: 2.5rem;
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--line);
    padding-top: 1.5rem;
    font-size: .85rem;
    color: var(--text-muted);
    letter-spacing: .04em;
}
.hero .meta strong {
    display: block;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0;
    margin-bottom: 2px;
}

/* ===========================
   Tarjetas / grids
   =========================== */
.grid {
    display: grid;
    gap: var(--gap);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 800px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
    background: var(--bg-alt);
    border: 1px solid var(--line);
    padding: 2rem 1.8rem;
    border-radius: var(--radius);
}
.card h3 {
    font-family: var(--serif);
    font-size: 1.4rem;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: var(--text);
}
.card p:last-child { margin-bottom: 0; }

.card.accent-1 { border-top: 3px solid var(--accent-1); }
.card.accent-2 { border-top: 3px solid var(--accent-2); }
.card.accent-3 { border-top: 3px solid var(--accent-3); }
.card.accent-4 { border-top: 3px solid var(--accent-4); }

/* ===========================
   Section heading
   =========================== */
.section-head {
    margin-bottom: 3rem;
    max-width: 720px;
}
.section-head .eyebrow {
    font-size: .75rem;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: .8rem;
}
.section-head h2 { margin-bottom: .5rem; }
.section-head p {
    font-family: var(--serif);
    font-size: 1.15rem;
    color: var(--text-soft);
}

/* ===========================
   Botón
   =========================== */
.btn {
    display: inline-block;
    padding: .85rem 1.6rem;
    font-size: .85rem;
    letter-spacing: .15em;
    text-transform: uppercase;
    background: var(--text);
    color: var(--bg);
    border: 1px solid var(--text);
    border-radius: var(--radius);
    transition: background .2s ease, color .2s ease;
}
.btn:hover {
    background: var(--bg);
    color: var(--text);
    border-bottom-color: var(--text);
}
.btn.outline {
    background: transparent;
    color: var(--text);
}
.btn.outline:hover {
    background: var(--text);
    color: var(--bg);
}

.btn-row {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===========================
   Listas de programa, problemas
   =========================== */
.topic-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.topic-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
    color: var(--text-soft);
}
.topic-list li:last-child { border-bottom: 0; }
.topic-list li strong {
    display: block;
    font-family: var(--serif);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: .25em;
}

.module {
    background: var(--bg-alt);
    border: 1px solid var(--line);
    border-left: 3px solid var(--accent-1);
    padding: 2rem 2rem;
    margin-bottom: 1.5rem;
}
.module:nth-child(2n) { border-left-color: var(--accent-2); }
.module:nth-child(3n) { border-left-color: var(--accent-3); }
.module:nth-child(4n) { border-left-color: var(--accent-4); }

.module h3 {
    font-family: var(--serif);
    font-size: 1.45rem;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: var(--text);
    margin-bottom: 1rem;
}
.module ul { margin-bottom: 0; }
.module .module-number {
    display: inline-block;
    font-size: .7rem;
    letter-spacing: .25em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: .8rem;
}

/* ===========================
   Problemas por categoría
   =========================== */
.cat {
    background: var(--bg-alt);
    border: 1px solid var(--line);
    padding: 1.8rem;
}
.cat h3 {
    font-family: var(--serif);
    font-size: 1.2rem;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: var(--text);
    border-bottom: 1px solid var(--line);
    padding-bottom: .6rem;
    margin-bottom: 1rem;
}
.cat ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.cat ul li {
    padding: .25rem 0;
    font-size: .95rem;
    color: var(--text-soft);
}

/* ===========================
   Datos clave
   =========================== */
.facts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border: 1px solid var(--line);
    background: var(--bg-alt);
}
@media (max-width: 800px) { .facts { grid-template-columns: repeat(2, 1fr); } }
.fact {
    padding: 1.8rem 1.5rem;
    border-right: 1px solid var(--line);
    text-align: center;
}
.fact:last-child { border-right: 0; }
@media (max-width: 800px) {
    .fact { border-right: 0; border-bottom: 1px solid var(--line); }
    .fact:nth-child(2n) { border-right: 0; }
}
.fact .num {
    font-family: var(--serif);
    font-size: 2.4rem;
    color: var(--text);
    display: block;
    line-height: 1;
    margin-bottom: .4rem;
}
.fact .lbl {
    font-size: .75rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* ===========================
   Footer
   =========================== */
.site-footer {
    background: var(--text);
    color: #c5c4be;
    padding: 3rem 0 2rem;
    margin-top: 5rem;
}
.site-footer .container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
}
@media (max-width: 800px) {
    .site-footer .container { grid-template-columns: 1fr; }
}
.site-footer h4 {
    color: var(--bg);
    font-size: .8rem;
    letter-spacing: .25em;
    margin-bottom: 1rem;
}
.site-footer p, .site-footer li, .site-footer a {
    color: #c5c4be;
    font-size: .9rem;
}
.site-footer a { border-color: transparent; }
.site-footer a:hover { color: var(--bg); border-bottom-color: var(--bg); }
.site-footer ul { list-style: none; padding: 0; }
.site-footer ul li { margin-bottom: .4em; }

.site-footer .legal {
    border-top: 1px solid #3a3d39;
    margin-top: 2rem;
    padding-top: 1.2rem;
    font-size: .75rem;
    color: var(--text-muted);
    letter-spacing: .05em;
    text-align: center;
}

/* ===========================
   Detalle página: cita inicial
   =========================== */
.page-head {
    padding: 5rem 0 3rem;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--line);
}
.page-head .eyebrow {
    font-size: .75rem;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1rem;
}
.page-head h1 {
    margin-bottom: 1rem;
}
.page-head p {
    font-family: var(--serif);
    font-size: 1.3rem;
    color: var(--text-soft);
    max-width: 720px;
}

/* ===========================
   Bio (docente)
   =========================== */
.bio {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: start;
}
@media (max-width: 800px) {
    .bio { grid-template-columns: 1fr; }
}
.bio-figure {
    background: var(--bg-soft);
    border: 1px solid var(--line);
    aspect-ratio: 3 / 4;
    overflow: hidden;
}
.bio-figure img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    display: block;
    filter: saturate(.85);
}

/* ===========================
   Contact
   =========================== */
.contact-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}
@media (max-width: 800px) { .contact-block { grid-template-columns: 1fr; } }
.contact-block dl {
    margin: 0;
}
.contact-block dt {
    font-size: .75rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: .3em;
}
.contact-block dd {
    margin: 0 0 1.6rem 0;
    font-family: var(--serif);
    font-size: 1.25rem;
    color: var(--text);
}

/* ===========================
   Prologue / cita
   =========================== */
.prologue {
    background: var(--bg-alt);
    border: 1px solid var(--line);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
}
.prologue h3 {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: .3rem;
}
.prologue .author {
    font-size: .8rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}
.prologue p {
    font-family: var(--serif);
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text);
}
.prologue p:last-child { margin-bottom: 0; }

/* ===========================
   Mark / highlight inline
   =========================== */
.tag {
    display: inline-block;
    background: var(--accent-1);
    color: var(--text);
    padding: .25rem .7rem;
    font-size: .7rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    border-radius: var(--radius);
    margin-right: .4rem;
}
.tag.t2 { background: var(--accent-2); }
.tag.t3 { background: var(--accent-3); }
.tag.t4 { background: var(--accent-4); }

/* ===========================
   WhatsApp Floating Button
   =========================== */
.wa-fab {
    position: fixed;
    right: 1.8rem;
    bottom: 1.8rem;
    width: 56px;
    height: 56px;
    background: var(--text);
    color: var(--bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 20px rgba(43,46,42,.18), 0 2px 6px rgba(43,46,42,.08);
    z-index: 200;
    border: 0 !important;
    transition: transform .2s ease, background .2s ease;
}
.wa-fab:hover {
    transform: translateY(-2px);
    background: #1c1e1c;
    border: 0 !important;
}
.wa-fab svg {
    width: 28px;
    height: 28px;
    fill: currentColor;
}
@media (max-width: 600px) {
    .wa-fab {
        right: 1.1rem;
        bottom: 1.1rem;
        width: 52px;
        height: 52px;
    }
    .wa-fab svg { width: 25px; height: 25px; }
}

/* ===========================
   Go to Top — botón sutil centrado
   =========================== */
.go-top {
    position: fixed;
    left: 50%;
    bottom: 1.8rem;
    transform: translateX(-50%) translateY(8px);
    width: 40px;
    height: 40px;
    background: rgba(247, 244, 238, .85);
    color: var(--text-soft);
    border: 1px solid var(--line);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 2px 8px rgba(43,46,42,.06);
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s ease, transform .3s ease, color .2s ease, background .2s ease;
    z-index: 199;
    text-decoration: none;
}
.go-top.visible {
    opacity: .9;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}
.go-top:hover {
    color: var(--text);
    background: var(--bg-alt);
    border-color: var(--text-muted);
}
.go-top svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}
@media (max-width: 600px) {
    .go-top {
        bottom: 1.1rem;
        width: 36px;
        height: 36px;
    }
    .go-top svg { width: 14px; height: 14px; }
}

/* =========================================================
   MOBILE — optimizaciones específicas (no afecta a escritorio)
   ========================================================= */

/* Navegación: menú hamburguesa hasta 820px */
@media (max-width: 820px) {
    .nav {
        padding: .85rem 1.1rem;
        flex-wrap: nowrap;
        gap: .6rem;
    }
    .nav-toggle {
        display: flex;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg);
        border-top: 1px solid var(--line);
        border-bottom: 1px solid var(--line);
        padding: .4rem 0;
        margin: 0;
        box-shadow: 0 6px 14px rgba(43,46,42,.06);
    }
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
    }
    .site-header.nav-open .nav-links {
        display: flex;
    }
    .nav-links li {
        width: 100%;
    }
    .nav-links a {
        display: block;
        padding: .95rem 1.5rem;
        font-size: .85rem;
        border-bottom: 1px solid var(--line) !important;
        letter-spacing: .12em;
    }
    .nav-links li:last-child a {
        border-bottom: 0 !important;
    }
    .nav-links a.active {
        background: var(--bg-soft);
        color: var(--text);
    }
    .nav-links a:hover {
        background: var(--bg-soft);
    }
    /* Animación de barras al abrir */
    .site-header.nav-open .nav-toggle-bar:nth-child(1) {
        transform: translateY(5.5px) rotate(45deg);
    }
    .site-header.nav-open .nav-toggle-bar:nth-child(2) {
        opacity: 0;
    }
    .site-header.nav-open .nav-toggle-bar:nth-child(3) {
        transform: translateY(-5.5px) rotate(-45deg);
    }
}

/* Tipografía, espaciados y layout en pantallas chicas */
@media (max-width: 640px) {
    body { font-size: 16px; line-height: 1.6; }

    h1 { font-size: clamp(1.6rem, 7.5vw, 2rem); }
    h2 { font-size: clamp(1.4rem, 6vw, 1.7rem); }
    h3 { font-size: 1.1rem; }

    .container,
    .narrow,
    .hero-split,
    .hero-inner {
        padding-left: 1.1rem;
        padding-right: 1.1rem;
    }

    section { padding: 2.6rem 0; }
    section.tight { padding: 1.6rem 0; }

    /* Brand más compacto */
    .nav-brand { gap: .6rem; }
    .brand-mark { width: 32px; height: 32px; }
    .brand-title { font-size: 1rem; }
    .brand-sub { font-size: .58rem; letter-spacing: .18em; }

    /* Hero */
    .hero { padding: 2.4rem 0 2.4rem; }
    .hero-split { gap: 1.4rem; }
    .hero .eyebrow { font-size: .7rem; letter-spacing: .25em; margin-bottom: 1rem; }
    .hero h1 { margin-bottom: .9rem; }
    .hero .lead { font-size: 1.1rem; line-height: 1.45; }
    .hero .meta {
        margin-top: 1.6rem;
        gap: 1rem;
        padding-top: 1.1rem;
        font-size: .8rem;
    }
    .hero .meta > div { flex: 1 1 100%; }
    .hero-caption { font-size: .82rem; }
    .hero-image { max-height: 260px; }

    /* Botones */
    .btn {
        padding: .8rem 1.3rem;
        font-size: .78rem;
        letter-spacing: .12em;
    }
    .btn-row { gap: .7rem; margin-top: 1.4rem; }

    /* Page-head (cabeceras de páginas interiores) */
    .page-head { padding: 2.6rem 0 1.8rem; }
    .page-head .eyebrow { font-size: .7rem; letter-spacing: .22em; margin-bottom: .7rem; }
    .page-head h1 { margin-bottom: .7rem; }
    .page-head p { font-size: 1.08rem; }

    /* Section heads */
    .section-head { margin-bottom: 1.8rem; }
    .section-head p { font-size: 1rem; }
    .section-head .eyebrow { letter-spacing: .22em; }

    /* Tarjetas / módulos / categorías */
    .card { padding: 1.4rem 1.2rem; }
    .card h3 { font-size: 1.2rem; }

    .module { padding: 1.3rem 1.2rem; margin-bottom: 1rem; }
    .module h3 { font-size: 1.2rem; margin-bottom: .7rem; }
    .module .module-number { letter-spacing: .2em; margin-bottom: .5rem; }

    .cat { padding: 1.2rem 1.1rem; }
    .cat h3 { font-size: 1.05rem; }
    .cat ul li { font-size: .92rem; }

    /* Topic list */
    .topic-list li { padding: .8rem 0; }
    .topic-list li strong { font-size: 1.02rem; }

    /* Citas */
    blockquote {
        padding: 1rem 1.1rem;
        font-size: 1.02rem;
        margin: 1.1rem 0;
    }
    blockquote cite { font-size: .78rem; letter-spacing: .15em; }

    /* Prólogos */
    .prologue { padding: 1.4rem 1.2rem; margin-bottom: 1.4rem; }
    .prologue h3 { font-size: 1.25rem; }
    .prologue .author { font-size: .72rem; letter-spacing: .18em; margin-bottom: 1rem; }
    .prologue p { font-size: 1rem; line-height: 1.6; }

    /* Datos clave */
    .fact { padding: 1.2rem .8rem; }
    .fact .num { font-size: 1.9rem; }
    .fact .lbl { font-size: .68rem; letter-spacing: .15em; }

    /* Libros */
    .book { gap: 1.2rem; margin-bottom: 2.2rem; padding-bottom: 2.2rem; }
    .book-meta { font-size: .72rem; letter-spacing: .14em; margin-bottom: 1rem; }
    .book-info p { font-size: .95rem; }
    .book-info ul.book-prologues a { font-size: 1rem; }
    .book-prologue-head { font-size: .7rem; letter-spacing: .2em; margin: 1.3rem 0 .6rem; padding-top: 1rem; }

    /* Bio (docente) */
    .bio { gap: 1.4rem; }

    /* Contacto */
    .contact-block { gap: 1.6rem; }
    .contact-block dd { font-size: 1.1rem; margin-bottom: 1.2rem; }

    /* hr / separadores */
    hr { margin: 1.8rem 0; }

    /* Footer */
    .site-footer { padding: 2rem 0 1.4rem; margin-top: 2.5rem; }
    .site-footer .container { gap: 1.3rem; padding-left: 1.1rem; padding-right: 1.1rem; }
    .site-footer h4 { font-size: .72rem; letter-spacing: .18em; margin-bottom: .6rem; }
    .site-footer p, .site-footer li, .site-footer a { font-size: .85rem; }
    .site-footer .legal { margin-top: 1.4rem; padding-top: 1rem; font-size: .7rem; }

    /* Centra y separa el botón “volver arriba” para que no choque con WhatsApp */
    .go-top { left: auto; right: 5rem; transform: translateY(8px); }
    .go-top.visible { transform: translateY(0); }
}

/* Pantallas muy pequeñas */
@media (max-width: 380px) {
    .brand-sub { display: none; }
    .nav { padding: .75rem .9rem; }
    .container, .narrow,
    .hero-split, .hero-inner {
        padding-left: .9rem;
        padding-right: .9rem;
    }
    .btn-row { flex-direction: column; align-items: stretch; }
    .btn { text-align: center; }
}