/* ============================================================
   BIFRONTE — Hoja de estilos compartida
   Estética: editorial, arquitectónica, sobria con carácter.
   ============================================================ */

:root {
  /* Paleta */
  --paper:        #f4ede0;
  --paper-deep:   #ebe2cf;
  --ink:          #1a1d2b;
  --ink-soft:     #44485a;
  --ink-mute:     #8a8a8a;
  --accent:       #8b3a2f;
  --accent-soft:  #c4684a;
  --gold:         #b8965a;
  --rule:         #d6ccb6;
  --rule-strong:  #b8ad94;

  /* Tipografía */
  --serif: 'Fraunces', 'Georgia', serif;
  --sans:  'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Métricas */
  --container: 1180px;
  --pad-x: clamp(24px, 5vw, 56px);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overflow-x: hidden;
}

/* Textura sutil de papel */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.1, 0 0 0 0 0.1, 0 0 0 0 0.15, 0 0 0 0.035 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

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

a { color: inherit; }

::selection { background: var(--accent); color: var(--paper); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  position: relative;
  z-index: 2;
}

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 237, 224, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  gap: 32px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  transform: translateY(2px);
}

.brand-mark span {
  width: 9px;
  height: 18px;
  background: var(--accent);
  border-radius: 1px;
}

.brand-mark span:last-child {
  background: var(--ink);
  transform: scaleX(-1);
}

.brand-text {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.015em;
  line-height: 1;
}

.brand-text em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.brand-suffix {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-left: 8px;
  border-left: 1px solid var(--rule-strong);
  padding-left: 12px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule-strong);
  padding: 8px 14px;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  cursor: pointer;
  border-radius: 2px;
}

.site-nav ul {
  display: flex;
  gap: 36px;
  list-style: none;
}

.site-nav a {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 0;
  position: relative;
  transition: color 0.25s ease;
}

.site-nav a:hover { color: var(--accent); }

.site-nav a.is-active { color: var(--ink); }

.site-nav a.is-active::after,
.site-nav a:hover::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-block; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
  }
  .site-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .site-nav ul {
    flex-direction: column;
    padding: 24px var(--pad-x) 32px;
    gap: 18px;
  }
  .brand-suffix { display: none; }
}

/* ============================================================
   HERO / CABECERAS DE PÁGINA
   ============================================================ */

.hero {
  padding: clamp(80px, 14vh, 160px) 0 clamp(70px, 12vh, 130px);
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
}

@media (min-width: 980px) {
  .hero-grid { grid-template-columns: 7fr 5fr; gap: 80px; align-items: end; }
}

.eyebrow {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.eyebrow::before {
  content: '';
  width: 36px;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 6.5vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--ink);
}

.hero h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.hero-aside {
  font-family: var(--serif);
  font-weight: 300;
  font-style: italic;
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--ink-soft);
  border-left: 1px solid var(--rule-strong);
  padding-left: 28px;
  max-width: 38ch;
}

.hero-meta {
  margin-top: clamp(48px, 8vh, 80px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}

.hero-meta-item .label {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 8px;
}

.hero-meta-item .value {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.hero-meta-item .value em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

/* Cabecera secundaria (subpáginas) */
.page-header {
  padding: clamp(70px, 12vh, 130px) 0 clamp(50px, 8vh, 90px);
  border-bottom: 1px solid var(--rule);
}

.page-header h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
  max-width: 16ch;
}

.page-header h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.page-header .lede {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 300;
  font-style: italic;
  color: var(--ink-soft);
  max-width: 56ch;
  line-height: 1.5;
}

/* ============================================================
   SECCIONES
   ============================================================ */

section.block {
  padding: clamp(70px, 12vh, 130px) 0;
  border-bottom: 1px solid var(--rule);
}

.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 64px;
}

@media (min-width: 820px) {
  .section-head { grid-template-columns: 1fr 2fr; gap: 80px; align-items: baseline; }
}

.section-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.section-label-num {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 1.05rem;
  color: var(--accent);
  margin-right: 10px;
  letter-spacing: 0;
}

.section-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.section-title em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.prose {
  max-width: 62ch;
  font-size: 1.06rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.prose p + p { margin-top: 1.4em; }

.prose strong { color: var(--ink); font-weight: 600; }

.prose h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.6rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 2em 0 0.7em;
}

.prose h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 1.8em 0 0.6em;
}

.prose ul, .prose ol { margin: 0.8em 0 0.8em 1.4em; }
.prose li { margin-bottom: 0.4em; }

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover { color: var(--accent-soft); }

/* ============================================================
   PUBLICACIONES — listado
   ============================================================ */

.publication {
  display: grid;
  grid-template-columns: 130px 1fr auto;
  gap: 40px;
  align-items: start;
  padding: 36px 0;
  border-top: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.35s ease, background 0.35s ease;
}

.publication:last-of-type { border-bottom: 1px solid var(--rule); }

.publication:hover {
  padding-left: 16px;
  background: linear-gradient(90deg, var(--paper-deep) 0%, transparent 60%);
}

.pub-date {
  font-family: var(--serif);
  line-height: 1;
}

.pub-day {
  font-size: 3rem;
  font-weight: 300;
  color: var(--accent);
  letter-spacing: -0.04em;
  display: block;
}

.pub-month {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink);
  margin-top: 10px;
  display: block;
}

.pub-year {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--ink-mute);
  margin-top: 4px;
  display: block;
}

.pub-body .pub-tag {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: inline-block;
}

.pub-body h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.5rem;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin-bottom: 10px;
  max-width: 36ch;
}

.pub-body p {
  font-size: 0.98rem;
  color: var(--ink-soft);
  max-width: 56ch;
}

.pub-arrow {
  font-family: var(--serif);
  font-size: 1.6rem;
  color: var(--ink-mute);
  transform: translateX(0);
  transition: transform 0.3s ease, color 0.3s ease;
  align-self: center;
}

.publication:hover .pub-arrow {
  transform: translateX(8px);
  color: var(--accent);
}

@media (max-width: 720px) {
  .publication {
    grid-template-columns: 90px 1fr;
    gap: 24px;
  }
  .pub-arrow { display: none; }
  .pub-day { font-size: 2.2rem; }
  .pub-body h3 { font-size: 1.2rem; }
}

/* ============================================================
   FICHA TÉCNICA / DATOS
   ============================================================ */

.factsheet {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-top: 16px;
}

.factsheet-item {
  background: var(--paper);
  padding: 28px 24px;
}

.factsheet-item .label {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 10px;
}

.factsheet-item .value {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.2;
}

.factsheet-item .value em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.factsheet-item .sub {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 4px;
}

/* ============================================================
   CONTACTO
   ============================================================ */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
}

@media (min-width: 880px) {
  .contact-grid { grid-template-columns: 1fr 1fr; gap: 80px; }
}

.contact-block h3 {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 14px;
}

.contact-block p {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 28px;
}

.contact-block a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.contact-block a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ============================================================
   CTA
   ============================================================ */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 16px 28px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  border-radius: 2px;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
}

.btn--ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

.btn-arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}

.btn:hover .btn-arrow { transform: translateX(4px); }

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding: 80px 0 32px;
  position: relative;
  z-index: 2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(244, 237, 224, 0.15);
}

@media (min-width: 820px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; gap: 64px; }
}

.footer-brand .brand-text { color: var(--paper); }
.footer-brand .brand-text em { color: var(--accent-soft); }
.footer-brand p {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 1rem;
  color: rgba(244, 237, 224, 0.7);
  margin-top: 20px;
  max-width: 38ch;
  line-height: 1.5;
}

.footer-col h4 {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }

.footer-col a {
  font-family: var(--sans);
  font-size: 0.92rem;
  color: rgba(244, 237, 224, 0.75);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-col a:hover { color: var(--paper); }

.footer-col p {
  font-family: var(--sans);
  font-size: 0.92rem;
  color: rgba(244, 237, 224, 0.75);
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 32px;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: rgba(244, 237, 224, 0.5);
  letter-spacing: 0.04em;
}

/* ============================================================
   ANIMACIONES DE ENTRADA
   ============================================================ */

@keyframes rise {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.rise {
  animation: rise 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.25s; }
.delay-3 { animation-delay: 0.4s; }
.delay-4 { animation-delay: 0.55s; }
.delay-5 { animation-delay: 0.7s; }

@media (prefers-reduced-motion: reduce) {
  .rise { animation: none; }
  html { scroll-behavior: auto; }
}