/* ==========================================================================
   SANTIAGO CALVO · style.css
   Sitio personal · Inspirado en jorgegalindo.eu, adaptado a la trayectoria
   de Santiago Calvo López (Centro Ruth Richardson · beBartlet · medios).

   Secciones:
   1. Variables y reset
   2. Tipografía base
   3. Header / navegación
   4. Layout general
   5. Hero
   6. Headings de sección
   7. Centro Ruth Richardson (briefs)
   8. Listas de publicaciones
   9. Newsletter
   10. Servicios
   11. Quién (bio, libros, papers)
   12. Footer
   13. Responsive
   ========================================================================== */


/* 1. Variables y reset
   -------------------------------------------------------------------------- */
:root {
  --bg: #fbfaf6;
  --ink: #111111;
  --ink-soft: #2a2a2a;
  --muted: #6a6a6a;
  --line: #e3e0d6;

  /* Acento principal: burdeos del manual de marca (HEX 721031) */
  --accent: #721031;
  --accent-soft: #f0d6da;
  --accent-ink: #fbfaf6;     /* Texto sobre fondos burdeos */

  /* Anchos de contenido */
  --max: 760px;
  --max-wide: 1400px;

  /* Familias tipográficas (display: Spectral, cuerpo: Montserrat) */
  --font-display: 'Spectral', Georgia, serif;
  --font-body: 'Montserrat', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }


/* 2. Tipografía base
   -------------------------------------------------------------------------- */
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Skip link de accesibilidad (oculto hasta foco) */
.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  background: var(--ink);
  color: var(--bg);
  padding: 0.5rem 1rem;
  z-index: 1000;
}


/* 3. Header / navegación
   -------------------------------------------------------------------------- */
header.site {
  position: sticky;
  top: 0;
  background: rgba(251, 250, 246, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}

.nav {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Marca: lockup SVG (corchete + SC + SANTIAGO CALVO) */
.brand a {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--ink);
}
.brand .brand-logo {
  height: 38px;
  width: auto;
  display: block;
}
.brand-logo-bracket { fill: var(--accent); }
.brand-logo-mark,
.brand-logo-word {
  font-family: var(--font-body);
  font-weight: 900;
  fill: var(--ink);
}
.brand-logo-mark { font-size: 32px; }
.brand-logo-word { font-size: 30px; letter-spacing: -0.5px; }
.brand a:hover .brand-logo { opacity: 0.85; }

.nav-links {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--ink); }

/* Iconos sociales en la barra superior derecha */
.nav-social {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  list-style: none;
}
.nav-social a {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.78rem;
  transition: color 0.15s;
}
.nav-social a:hover { color: var(--accent); }

/* Selector de idioma (texto, distinto a los iconos) */
.nav-lang { display: flex; gap: 0.4rem; }
.nav-lang a { color: var(--muted); text-decoration: none; }
.nav-lang a:hover { color: var(--ink); }

/* Icono SVG genérico (X, LinkedIn, Substack y similares) */
.icon {
  width: 18px;
  height: 18px;
  display: block;
  flex-shrink: 0;
}
.icon-lg { width: 22px; height: 22px; }


/* 4. Layout general
   -------------------------------------------------------------------------- */
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--line);
}
section:last-of-type { border-bottom: none; }

.section-label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 0.18em;
  margin-bottom: 1.5rem;
  display: inline-flex;
  align-items: center;
}
/* Corchete decorativo del manual de marca antes de cada etiqueta de sección */
.section-label::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  border-top: 2.5px solid var(--accent);
  border-left: 2.5px solid var(--accent);
  margin-right: 0.65rem;
  vertical-align: middle;
  flex-shrink: 0;
}


/* 5. Hero
   -------------------------------------------------------------------------- */
.hero {
  padding-top: 5rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--line);
}

.greeting {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* Cursor parpadeante estilo terminal */
.cursor {
  display: inline-block;
  background: var(--ink);
  color: var(--bg);
  width: 0.55em;
  height: 1.05em;
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1.1s infinite;
}
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.012em;
  margin-bottom: 2.5rem;
  max-width: 38ch;
}
.hero h1 em {
  font-style: italic;
  font-weight: 400;
  font-family: var(--font-display);
  background: linear-gradient(transparent 72%, var(--accent-soft) 72%);
  padding: 0 0.08em;
}

.hero .portrait {
  width: 100%;
  max-width: 240px;
  height: auto;
  display: block;
  margin: 0 0 2rem;
  border-radius: 2px;
  filter: grayscale(8%);
}

.hero p.lede {
  font-size: 1.05rem;
  max-width: 50ch;
  color: var(--ink-soft);
}
.hero p.lede a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1.5px solid var(--accent);
  transition: background 0.15s;
}
.hero p.lede a:hover { background: var(--accent-soft); }


/* 6. Headings de sección
   -------------------------------------------------------------------------- */
section h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  max-width: 32ch;
}

section h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.15rem;
  margin: 2.5rem 0 1rem;
}

section p {
  margin-bottom: 1rem;
  max-width: 60ch;
  color: var(--ink-soft);
}


/* 7. Centro Ruth Richardson (briefs / informes destacados)
   -------------------------------------------------------------------------- */
.centro-link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink);
  text-decoration: none;
  margin: 0.5rem 0 1rem;
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 1px;
  transition: background 0.15s;
}
.centro-link:hover { background: var(--accent-soft); }

.briefs-label {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.briefs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.75rem;
  list-style: none;
  margin-top: 1.5rem;
}

.brief {
  display: block;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: transform 0.2s;
}
.brief:hover { transform: translateY(-3px); }
.brief:hover h4 {
  background: var(--accent-soft);
  box-shadow: 0 -1px 0 var(--accent-soft), 0 2px 0 var(--accent-soft);
}

/* Cubierta real del informe (imagen) */
.brief-cover {
  aspect-ratio: 3 / 4;
  margin-bottom: 0.9rem;
  border-radius: 2px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  transition: border-color 0.2s;
}
.brief:hover .brief-cover { border-color: var(--accent); }
.brief-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.brief-meta {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}
.brief h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: -0.005em;
  display: inline;
  transition: background 0.15s;
}
.brief-credits {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.45rem;
  margin-bottom: 0;
}


/* 7b. Bloques de libro (destacado y secundario)
   -------------------------------------------------------------------------- */
.section-lede {
  font-size: 1.05rem;
  max-width: 56ch;
  color: var(--ink-soft);
  margin-bottom: 2.5rem;
}

.libro-destacado,
.libro-secundario {
  display: grid;
  grid-template-columns: minmax(180px, 240px) 1fr;
  gap: 2rem;
  align-items: start;
  margin-bottom: 3rem;
}
.libro-secundario {
  grid-template-columns: minmax(120px, 160px) 1fr;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.libro-cover-wrap {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  overflow: hidden;
  border-radius: 2px;
  transition: border-color 0.2s, transform 0.2s;
}
a.libro-cover-wrap:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.libro-cover-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.libro-meta {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.55rem;
}

.libro-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.6vw, 1.8rem);
  line-height: 1.15;
  letter-spacing: 0.005em;
  margin-bottom: 0.6rem;
  color: var(--ink);
}
.libro-title--small { font-size: clamp(1.15rem, 2vw, 1.35rem); }

.libro-subtitle {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 0.8rem;
  max-width: 50ch;
}

.libro-credits {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
  max-width: 60ch;
}

.libro-blurb {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-bottom: 1.4rem;
  max-width: 56ch;
}

.libro-buy {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}


/* 7c. Botones (genéricos, reutilizables en libros y CTAs)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.65rem 1rem;
  border-radius: 2px;
  transition: transform 0.15s, background 0.15s, color 0.15s;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.btn-primary:hover { background: #5e0d28; border-color: #5e0d28; }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }


/* 7d. Feed cronológico de columnas y apariciones (Escribir y Medios)
   -------------------------------------------------------------------------- */
.column-feed {
  list-style: none;
  margin: 1.5rem 0;
}
.column-feed li {
  border-top: 1px solid var(--line);
}
.column-feed li:last-child {
  border-bottom: 1px solid var(--line);
}
.column-feed a {
  display: grid;
  grid-template-columns: 110px 200px 1fr;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.1rem 0;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.15s;
}
.column-feed a:hover {
  background: rgba(114, 16, 49, 0.025);
}
.column-feed .feed-date {
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.column-feed .feed-source {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.01em;
}
.column-feed .feed-title {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--ink);
}
.column-feed a:hover .feed-title {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
}

.feed-archives {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.4rem;
  align-items: baseline;
}
.feed-archives a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 1px;
  transition: background 0.15s;
}
.feed-archives a:hover { background: var(--accent-soft); }


/* 8. Listas de publicaciones (informes y columnas)
   -------------------------------------------------------------------------- */
.pub-list {
  list-style: none;
  margin-top: 1.5rem;
}
.pub-list li {
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}
.pub-list li:last-child {
  border-bottom: 1px solid var(--line);
}
.pub-list a {
  display: block;
  text-decoration: none;
  color: var(--ink);
}
.pub-list .pub-meta {
  font-family: var(--font-body);
  font-size: 0.74rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}
.pub-list .pub-title {
  font-family: var(--font-display);
  font-weight: 380;
  font-size: 1.18rem;
  line-height: 1.3;
  letter-spacing: -0.005em;
}
.pub-list a:hover .pub-title {
  background: var(--accent-soft);
  box-shadow: 0 -1px 0 var(--accent-soft), 0 2px 0 var(--accent-soft);
}
.pub-list .pub-outlet {
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: 0.3rem;
}


/* 9. Newsletter (El Margen Correcto)
   -------------------------------------------------------------------------- */
.newsletter { text-align: left; }

.newsletter .blurb {
  font-family: var(--font-display);
  font-weight: 400;
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--ink);
  max-width: 56ch;
  margin-bottom: 2rem;
}
.newsletter .blurb em {
  font-style: normal;
  font-weight: 500;
  background: linear-gradient(transparent 70%, var(--accent-soft) 70%);
  padding: 0 0.1em;
}

/* Feed de últimas entradas del Substack */
.newsletter-feed {
  list-style: none;
  margin: 1.5rem 0 2rem;
}
.newsletter-feed li {
  border-top: 1px solid var(--line);
}
.newsletter-feed li:last-child {
  border-bottom: 1px solid var(--line);
}
.newsletter-feed a {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.15s;
}
.newsletter-feed a:hover {
  background: rgba(114, 16, 49, 0.025);
}
.newsletter-feed .feed-date {
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
  padding-top: 0.15rem;
}
.newsletter-feed .feed-text {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.newsletter-feed .feed-title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.35;
  color: var(--ink);
}
.newsletter-feed a:hover .feed-title {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
}
.newsletter-feed .feed-subtitle {
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.45;
}

.subscribe-cta {
  margin-top: 1rem;
  font-size: 0.9rem;
}


/* 10. Servicios
   -------------------------------------------------------------------------- */
.servicios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 2rem 0;
}
.servicio {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.5rem;
  align-items: start;
}
.servicio:last-child { border-bottom: 1px solid var(--line); }
.servicio .num {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--muted);
  padding-top: 0.2rem;
}
.servicio h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.2rem;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.005em;
}
.servicio p {
  font-size: 0.95rem;
  margin-bottom: 0;
  color: var(--ink-soft);
}

/* CTA al final de servicios (botón hacia contacto.html) */
.servicios-cta {
  margin-top: 2.5rem;
  padding: 2.5rem 2rem;
  background: var(--ink);
  color: var(--bg);
  border-radius: 2px;
}
.servicios-cta h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.5rem;
  color: var(--bg);
  margin-top: 0;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}
.servicios-cta > p {
  color: rgba(251, 250, 246, 0.8);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  max-width: 60ch;
}
.servicios-cta .btn-primary {
  background: var(--accent);
  border-color: var(--accent);
}
.servicios-cta .btn-primary:hover { background: #5e0d28; border-color: #5e0d28; }

/* Página de contacto: contenedor de la sección */
.contacto {
  max-width: 720px;
  padding: 5rem 0;
}

/* Formulario de contacto: campos limpios */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 560px;
}
.contact-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.contact-form input,
.contact-form textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 0.75rem 0.9rem;
  transition: border-color 0.15s, background 0.15s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.contact-form .form-label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.contact-form textarea { resize: vertical; min-height: 140px; }
.contact-form button {
  align-self: flex-start;
  margin-top: 0.5rem;
  cursor: pointer;
}

/* Variante embebida sobre fondo oscuro (no usada en home, conservada para reutilizar) */
.contact-form--dark input,
.contact-form--dark textarea {
  color: var(--bg);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.18);
}
.contact-form--dark input:focus,
.contact-form--dark textarea:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
}
.contact-form--dark .form-label {
  color: rgba(251, 250, 246, 0.6);
}


/* 11. Quién soy (bio, formación, CV e investigación académica)
   -------------------------------------------------------------------------- */
.quien-layout {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 2rem;
  align-items: start;
  margin: 1rem 0 2rem;
}
.quien-photo { margin: 0; }
.quien-portrait {
  width: 100%;
  height: auto;
  border-radius: 2px;
  filter: grayscale(15%);
  display: block;
}
.quien-copy p { margin-bottom: 1rem; }
.quien-copy a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 1px;
  transition: background 0.15s;
}
.quien-copy a:hover { background: var(--accent-soft); }

.quien-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

/* Lista de papers académicos (formato APA en items) */
.research-head {
  margin-top: 2.5rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}
.research-list {
  list-style: none;
  margin-top: 1rem;
}
.research-list .paper-block {
  padding: 1.1rem 0;
  margin: 0;
  border-top: 1px solid var(--line);
  border-bottom: none;
  font-size: 0.95rem;
  line-height: 1.55;
  background: transparent;
  border-radius: 0;
}
.research-list .paper-block:last-child {
  border-bottom: 1px solid var(--line);
}
.research-list .paper-block strong { font-weight: 600; }

.scholar-prompt { margin-top: 1.25rem; }
.scholar-link {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 1px;
  transition: background 0.15s;
}
.scholar-link:hover { background: var(--accent-soft); }


/* 12. Footer
   -------------------------------------------------------------------------- */
footer.site {
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: 4rem 1.5rem 3rem;
  text-align: left;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
}
.contact-prompt {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  max-width: 55ch;
}
.contact-email {
  font-family: var(--font-display);
  font-weight: 380;
  font-size: 1.6rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  display: inline-block;
  margin-bottom: 2.5rem;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}
.contact-email:hover { background: var(--accent-soft); }

.social {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  margin-bottom: 3rem;
}
.social a {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  text-decoration: none;
  padding: 0.4rem;
  margin: -0.4rem;
  transition: color 0.15s;
}
.social a:hover { color: var(--accent); }

.eof {
  font-family: var(--font-body);
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}


/* 13. Responsive (móvil)
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  body { font-size: 16px; }

  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.7rem;
  }
  .nav-links { gap: 1rem; font-size: 0.78rem; }
  .nav-social { font-size: 0.78rem; }

  .hero { padding-top: 3rem; }
  section { padding: 3rem 0; }

  .servicio {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .servicio .num { padding-top: 0; }

  /* Libros: cubierta y copy se apilan en móvil */
  .libro-destacado,
  .libro-secundario {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .libro-destacado .libro-cover-wrap { max-width: 220px; }
  .libro-secundario .libro-cover-wrap { max-width: 140px; }

  /* Feed de columnas y newsletter: en móvil, todo en una columna */
  .column-feed a,
  .newsletter-feed a {
    grid-template-columns: 1fr;
    gap: 0.3rem;
    padding: 1rem 0;
  }
  .column-feed .feed-source { font-size: 0.78rem; }

  /* Formulario de contacto: campos apilados en móvil */
  .contact-form .form-row { grid-template-columns: 1fr; }

  /* Quién soy: foto y bio se apilan en móvil */
  .quien-layout {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .quien-photo { max-width: 180px; }
}