/* ==========================================================================
   style.css — ESTILOS DEL SITIO
   ==========================================================================
   Paleta y medidas centralizadas en :root. Para retocar colores o el ancho
   de la sidebar, edita solo las variables de abajo.
   ========================================================================== */

:root {
  /* Paleta (neutra, tema claro) */
  --accent:      #111114;   /* sidebar y acentos (casi negro) */
  --accent-deep: #000000;   /* sombras / fondos sobre el acento */
  --ink:         #111114;   /* texto principal */
  --ink-soft:    #6f7177;   /* texto secundario */
  --ink-faint:   #aaadb3;   /* texto terciario (primer nombre del h1) */
  --paper:       #ffffff;   /* fondo de contenido */
  --line:        #e8e8eb;   /* divisores sutiles */
  --icon-bg:     #111114;   /* fondo de iconos sociales */
  --sidebar-fg:        #ffffff;
  --sidebar-fg-dim:    rgba(255, 255, 255, 0.60);

  /* Medidas */
  --sidebar-w:   270px;
  --content-pad: 76px;

  /* Tipografía: una sola grotesca limpia (Roboto) en todo el sitio,
     con titulares grandes en peso light (300). */
  --font-body: "Roboto", "Helvetica Neue", system-ui, sans-serif;
}

/* ---------- Reset mínimo ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;          /* 17px */
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

/* ==========================================================================
   SIDEBAR
   ========================================================================== */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  background:
    radial-gradient(circle at 50% -10%, rgba(255, 255, 255, 0.08), transparent 55%),
    var(--accent);
  color: var(--sidebar-fg);
  display: flex;
  flex-direction: column;
  align-items: center;
  /* La foto cae hacia el primer tercio de la pantalla, como la referencia */
  padding: clamp(48px, 26vh, 300px) 20px 32px;
  overflow-y: auto;               /* por si la ventana es muy baja */
  z-index: 10;
}

.profile-photo {
  width: 210px;
  height: 210px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255, 255, 255, 0.92);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  background: var(--accent-deep);
}

/* ---------- Navegación ---------- */
.site-nav { margin-top: 44px; width: 100%; }

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9375rem;           /* 15px */
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--sidebar-fg-dim);
  padding: 10px 14px;
  transition: color 0.18s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--sidebar-fg);
}

.nav-link.active {
  color: var(--sidebar-fg);
  position: relative;
}

/* Pequeña marca bajo el item activo */
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  width: 22px;
  height: 2px;
  background: rgba(255, 255, 255, 0.85);
}

.nav-link:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ---------- Selector de idioma EN / ES ---------- */
.lang-item {
  display: flex;
  gap: 6px;
  margin-top: 22px;
}

.lang-btn {
  font: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--sidebar-fg-dim);
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  padding: 4px 12px;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.lang-btn:hover { color: var(--sidebar-fg); border-color: rgba(255, 255, 255, 0.55); }

.lang-btn.active {
  color: var(--accent);
  background: #fff;
  border-color: #fff;
  cursor: default;
}

.lang-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ==========================================================================
   CONTENIDO
   ========================================================================== */
.content {
  margin-left: var(--sidebar-w);
  padding: 72px var(--content-pad) 96px;
  max-width: calc(var(--sidebar-w) + 980px);
}

section { scroll-margin-top: 24px; }

section + section { margin-top: 88px; }

/* ---------- Hero / About ----------
   Proporciones de la referencia: el About llena la primera pantalla,
   el nombre cae hacia el primer tercio, la línea de metadatos va pegada
   al nombre y la bio queda separada por un gran espacio. */
#about {
  min-height: 84vh;
  padding-top: clamp(40px, 15vh, 190px);
}

.hero-name {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(2.5rem, 4.6vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 10px;
}

/* Dos tonos como el resto del sitio: nombre tenue, apellido en negro */
.hero-name .name-first { color: var(--ink-faint); }
.hero-name .name-last  { color: var(--ink); }

.hero-meta {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0 0 76px;          /* gran espacio antes de la bio, como la referencia */
}

/* Separador " · " entre items de metadatos */
.meta-sep {
  margin: 0 10px;
  color: var(--ink-soft);
}

.meta-email {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.meta-email:hover { color: var(--ink-soft); }

.hero-bio p {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 1.1875rem;        /* subtítulo gris, como la referencia */
  line-height: 1.6;
  color: var(--ink-soft);
}

.hero-bio a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--ink-faint);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}

.hero-bio a:hover,
.hero-bio a:focus-visible {
  text-decoration-color: var(--ink);
}

/* ---------- Iconos sociales ---------- */
.hero-social {
  display: flex;
  gap: 20px;
  margin-top: 52px;
}

.social-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--icon-bg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s ease, transform 0.18s ease;
}

.social-icon svg {
  width: 25px;
  height: 25px;
  fill: #fff;
}

.social-icon:hover,
.social-icon:focus-visible {
  background: var(--ink-soft);
  transform: translateY(-2px);
}

.social-icon:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ---------- Títulos de sección: cuadrado + grotesca light ---------- */
.section-title {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(2rem, 3.4vw, 2.75rem);
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.section-title::before {
  content: "";
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--ink);
  flex-shrink: 0;
}

/* ==========================================================================
   ENTRADAS DE PAPERS (publications, working papers, teaching)
   ========================================================================== */
.paper { margin-top: 44px; }

.paper-title {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1.1875rem;
  letter-spacing: 0;
  color: var(--ink);
  line-height: 1.45;
  margin: 0 0 6px;
}

.paper-authors {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0 0 4px;
}

.paper-venue {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

/* Descripción visible (projects) */
.paper-desc {
  font-size: 1rem;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 12px;
}

/* ---------- Fila de acciones: [link] · [link] ---------- */
.paper-actions {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

.action-wrap + .action-wrap::before {
  content: "·";
  margin: 0 8px;
}

.paper-action {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--ink-faint);
  text-underline-offset: 3px;
  border: 0;
  background: none;
  font: inherit;
  padding: 0;
  cursor: pointer;
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}

.paper-action:hover,
.paper-action:focus-visible {
  text-decoration-color: var(--ink);
}

.paper-action:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

/* ---------- Abstract expandible ----------
   Animación con grid-template-rows (0fr → 1fr): suave y sin alturas fijas. */
.abstract-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.32s ease;
}

.abstract-panel.open { grid-template-rows: 1fr; }

.abstract-inner { overflow: hidden; min-height: 0; }

.abstract-text {
  margin: 14px 0 0;
  padding: 16px 20px;
  max-width: 70ch;
  font-size: 0.95rem;
  color: var(--ink-soft);
  background: #f6f6f7;
  border-left: 3px solid var(--ink);
}

/* ---------- Talks ---------- */
.talks-list {
  margin: 28px 0 0;
  padding-left: 20px;
}

.talks-list li { margin-bottom: 10px; }

.talks-list a { color: var(--ink); }

/* ==========================================================================
   RESPONSIVE — la sidebar se apila arriba del contenido
   ========================================================================== */
@media (max-width: 860px) {
  .sidebar {
    position: static;
    width: 100%;
    padding: 88px 16px 28px;   /* deja sitio a la nav fija de arriba */
    overflow: visible;
  }

  .profile-photo {
    width: 132px;
    height: 132px;
  }

  /* Navegación horizontal fija en la parte superior de la pantalla */
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    margin-top: 0;
    background: var(--accent);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18);
    z-index: 20;
  }

  .site-nav ul {
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 0;
    overflow-x: auto;
    padding: 4px 12px;
    -webkit-overflow-scrolling: touch;
  }

  .nav-link {
    white-space: nowrap;
    font-size: 0.8125rem;
    letter-spacing: 0.14em;
    padding: 12px 12px;
  }

  .lang-item {
    margin: 0 0 0 auto;          /* empuja el selector al extremo derecho */
    align-items: center;
    padding-right: 4px;
  }

  .content {
    margin-left: 0;
    padding: 48px 22px 72px;
  }

  section { scroll-margin-top: 64px; }  /* compensa la nav fija */

  section + section { margin-top: 64px; }

  /* En móvil el hero no necesita el empuje vertical de escritorio */
  #about { min-height: auto; padding-top: 8px; }

  .hero-meta { margin-bottom: 40px; }

  .hero-social { margin-top: 36px; gap: 14px; }

  .social-icon { width: 48px; height: 48px; }

  .hero-meta .meta-item { display: block; margin-top: 4px; }
  .hero-meta .meta-sep { display: none; }
  .hero-meta .meta-email { display: inline-block; }  /* subrayado solo bajo el texto */
}

/* En móvil, la nav pegajosa necesita que el body no tenga scroll horizontal */
@media (max-width: 860px) {
  html, body { overflow-x: hidden; }
}