/* ---------------------------------------------------------------------------
   Tipografía Inter alojada en el propio servidor.
   Sustituye a la carga desde Google Fonts, que enviaba la IP del visitante
   a servidores de terceros. No modificar las rutas.
   Inter es software libre bajo SIL Open Font License 1.1.
   --------------------------------------------------------------------------- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/inter-400.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/inter-500.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/inter-600.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('assets/fonts/inter-700.woff2') format('woff2');
}

:root {
  --primary: #0e1d2c;
  /* Deep navy */
  --secondary: #1f3b54;
  /* Slate blue */
  --accent: #507b9a;
  /* Light steel */
  --text-main: #222222;
  --text-light: #555555;
  --bg-main: #ffffff;
  --bg-alt: #f4f6f8;
  /* Very light gray for alternate sections */
  --white: #ffffff;

  --transition: all 0.3s ease;
  --border-radius: 4px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, blinkmacsystemfont, 'Segoe UI', roboto, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1,
h2,
h3,
h4 {
  color: var(--primary);
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  width: 40px;
  height: 3px;
  background-color: var(--accent);
  bottom: -10px;
  left: 0;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1rem;
}

/* Layout & Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

section.alt-bg {
  background-color: var(--bg-alt);
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  z-index: 1000;
  border-bottom: 1px solid #eaeaea;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: var(--transition);
}

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

.lang-toggle {
  background: none;
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.lang-toggle:hover {
  background-color: var(--primary);
  color: var(--white);
}

/* Hero Section */
.hero {
  position: relative;
  padding-top: 150px;
  padding-bottom: 5rem;
  background-color: var(--primary);
  color: var(--white);
  text-align: center;
  overflow: hidden;
}

.hero-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  max-width: 800px;
  opacity: 0.05;
  pointer-events: none;
  z-index: 1;
}

.hero-watermark img {
  width: 100%;
  height: auto;
  filter: grayscale(100%) brightness(200%);
}

.hero h1 {
  color: var(--white);
  max-width: 800px;
  margin: 0 auto 1.5rem;
  font-size: 3rem;
}

.hero p {
  font-size: 1.25rem;
  color: #d1dde5;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero .btn {
  display: inline-block;
  background-color: var(--white);
  color: var(--primary);
  padding: 0.8rem 2rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  margin-top: 1rem;
}

.hero .btn:hover {
  background-color: var(--bg-alt);
  transform: translateY(-2px);
}

/* Services / What We Do */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.service-card {
  background-color: var(--white);
  padding: 2.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-top: 4px solid var(--accent);
  transition: var(--transition);
}

.service-card {
  background-color: var(--white);
  padding: 2.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-top: 4px solid var(--accent);
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.service-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  margin: -2.5rem -2.5rem 1.5rem -2.5rem;
  width: calc(100% + 5rem);
  border-bottom: 3px solid var(--accent);
}

.service-card h3 {
  color: var(--primary);
}

.service-card ul {
  list-style: none;
  margin-top: 1.5rem;
}

.service-card ul li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.8rem;
  color: var(--text-light);
  font-size: 0.95rem;
}

.service-card ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Team & Experience */
.experience-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.experience-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.icon-check {
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Team Main Grid */
.team-main-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.team-main-card {
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-top: 4px solid var(--accent);
  text-align: center;
  transition: var(--transition);
}

.team-main-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.icon-main {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
}

/* Values Grid */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.value-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--white);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.icon-value {
  color: var(--accent);
  font-size: 1.5rem;
}

/* Video Container */
.video-container {
  max-width: 900px;
  margin: 3rem auto 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
  background-color: var(--primary);
}

.video-container video {
  display: block;
  width: 100%;
  height: auto;
  outline: none;
}

/* Footer */
footer {
  background-color: var(--primary);
  color: var(--white);
  padding: 3rem 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-contact h4,
.footer-social h4 {
  color: var(--white);
  margin-bottom: 1rem;
}

.footer-social a {
  color: var(--white);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-social a:hover {
  color: var(--accent);
}

.footer-bottom {
  margin-top: 3rem;
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    /* simple mobile nav approach - hiding text links */
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .hero-container {
    flex-direction: column;
    text-align: center !important;
    gap: 2rem !important;
  }
}

/* Subtle fade-in animation for js */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
/* ---------------------------------------------------------------------------
   Publicaciones
   --------------------------------------------------------------------------- */

/* Botón fuera de la sección hero */
.btn {
  display: inline-block;
  background-color: var(--primary);
  color: var(--white);
  padding: 0.8rem 2rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--primary);
}

.btn:hover {
  background-color: var(--secondary);
  border-color: var(--secondary);
  transform: translateY(-2px);
}

.hero .btn {
  border-color: var(--white);
}

.publications-teaser {
  margin-top: 2rem;
  max-width: 760px;
}

.publications-teaser p {
  font-size: 1.15rem;
  color: var(--text-light);
  margin-bottom: 1.75rem;
}

/* Página de listado */
.page-header {
  padding: 9rem 0 3rem;
  background-color: var(--bg-alt);
  border-bottom: 1px solid #e3e8ec;
}

.page-header h1 {
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--text-light);
  max-width: 760px;
  font-size: 1.1rem;
  margin-bottom: 0;
}

.papers-list {
  display: grid;
  gap: 1.5rem;
  margin-top: 1rem;
}

.paper-card {
  display: block;
  border: 1px solid #e3e8ec;
  border-left: 3px solid var(--accent);
  border-radius: var(--border-radius);
  padding: 1.75rem 2rem;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  background-color: var(--white);
}

.paper-card:hover {
  box-shadow: var(--shadow);
  border-left-color: var(--primary);
  transform: translateY(-2px);
}

.paper-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.6rem;
}

.paper-tag {
  display: inline-block;
  background-color: var(--bg-alt);
  border: 1px solid #dde4ea;
  border-radius: 3px;
  padding: 0.1rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--secondary);
}

.paper-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.paper-card p {
  color: var(--text-light);
  margin-bottom: 0;
}

.papers-empty {
  border: 1px dashed #cdd6dd;
  border-radius: var(--border-radius);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-light);
  background-color: var(--bg-alt);
}

.papers-empty p:last-child {
  margin-bottom: 0;
}

/* Página de un paper */
.paper-body {
  max-width: 780px;
}

.paper-body h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
}

.paper-abstract {
  font-size: 1.15rem;
  color: var(--text-main);
}

.paper-actions {
  margin: 2.5rem 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.paper-filesize {
  font-size: 0.85rem;
  color: var(--text-light);
}

.back-link {
  display: inline-block;
  margin-top: 2.5rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.back-link:hover {
  text-decoration: underline;
}

footer a {
  color: inherit;
}

/* ---------------------------------------------------------------------------
   Páginas legales
   --------------------------------------------------------------------------- */
.legal-body {
  max-width: 820px;
}

.legal-body h2 {
  font-size: 1.35rem;
  margin-top: 2.75rem;
  margin-bottom: 1.25rem;
}

.legal-body h3 {
  font-size: 1.05rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--secondary);
}

.legal-body p,
.legal-body li {
  color: var(--text-main);
}

.legal-body ul {
  margin: 0 0 1rem 1.25rem;
}

.legal-body li {
  margin-bottom: 0.4rem;
}

.legal-body a {
  color: var(--accent);
}

.legal-fecha {
  font-size: 0.85rem;
  color: var(--text-light);
  border-bottom: 1px solid #e3e8ec;
  padding-bottom: 1rem;
}

.legal-nota {
  margin-top: 2.5rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-alt);
  border-left: 3px solid var(--accent);
  font-size: 0.9rem;
  color: var(--text-light);
}

.dato-pendiente {
  background-color: #fff3cd;
  border: 1px solid #e0c877;
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  font-size: 0.9em;
  color: #6b5310;
}

.tabla-cookies {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 1rem;
  font-size: 0.9rem;
}

.tabla-cookies th {
  background-color: var(--primary);
  color: var(--white);
  text-align: left;
  padding: 0.7rem 0.9rem;
  font-weight: 600;
}

.tabla-cookies td {
  border: 1px solid #e3e8ec;
  padding: 0.7rem 0.9rem;
  vertical-align: top;
}

.tabla-cookies code {
  background-color: var(--bg-alt);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}

/* Enlaces legales del pie */
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-legal a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-legal a:hover {
  color: var(--white);
  text-decoration: underline;
}

@media (max-width: 768px) {
  .tabla-cookies,
  .tabla-cookies thead,
  .tabla-cookies tbody,
  .tabla-cookies tr,
  .tabla-cookies th,
  .tabla-cookies td {
    display: block;
    width: 100%;
  }

  .tabla-cookies thead {
    display: none;
  }

  .tabla-cookies tr {
    margin-bottom: 1rem;
    border: 1px solid #e3e8ec;
  }

  .tabla-cookies td {
    border: none;
    border-bottom: 1px solid #eef2f5;
  }
}