:root {
  --color-bg: #f0eef5;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #4a4a68;
  --color-accent: #6b2d8b;
  --color-accent-light: #8b45a6;
  --color-accent-bg: rgba(107, 45, 139, 0.08);
  --color-border: #121218;
  --color-header-overlay: rgba(26, 26, 46, 0.8);
  --color-control-bg: rgba(255, 255, 255, 0.95);
  --color-footer-bg: #1a1a2e;
  --color-footer-text: rgba(255, 255, 255, 0.8);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
}

body.dark {
  --color-bg: #121218;
  --color-surface: #1e1e2a;
  --color-text: #e8e6f0;
  --color-text-secondary: #a8a4b8;
  --color-accent: #a855c8;
  --color-accent-light: #c06ae0;
  --color-accent-bg: rgba(168, 85, 200, 0.12);
  --color-border: #2e2e3e;
  --color-header-overlay: rgba(18, 18, 24, 0.85);
  --color-control-bg: rgba(30, 30, 42, 0.95);
  --color-footer-bg: #0e0e14;
  --color-footer-text: rgba(232, 230, 240, 0.7);
  --color-link: #c06ae0;
  --color-link-bg: rgba(168, 85, 200, 0.18);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
}

body.dark .card-link,
body.dark .pub-link,
body.dark .email-link,
body.dark .contact-links a {
  color: var(--color-link);
  background: var(--color-link-bg);
}

body.dark .card-link:hover,
body.dark .pub-link:hover,
body.dark .email-link:hover {
  background: var(--color-accent);
  color: #ffffff;
}

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

html {
  scroll-behavior: smooth;
}

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

.site-header {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
}

.header-logo {
  margin-bottom: 2rem;
  text-align: center;
}

.header-logo img {
  max-width: 500px;
  height: auto;
  max-height: 250px;
  object-fit: contain;
  display: block;
  margin: 0 auto;
}

.header-center {
  flex: 1;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.header-image {
  line-height: 0;
}

.header-image img {
  width: 100%;
  height: auto;
  max-height: 160px;
  object-fit: cover;
  object-position: center;
  display: block;
}

.header-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem 1rem;
  background: linear-gradient(to top, var(--color-header-overlay), transparent);
}

.header-overlay h1 {
  color: #ffffff;
  font-size: clamp(0.85rem, 2vw, 1.15rem);
  font-weight: 600;
  text-align: center;
  letter-spacing: -0.01em;
}

.header-controls {
  flex-shrink: 0;
  display: flex;
  gap: 0.5rem;
}

.lang-toggle,
.theme-toggle {
  background: var(--color-control-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  font-family: inherit;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.lang-toggle:hover,
.theme-toggle:hover {
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.theme-toggle {
  background: #ffffff;
  padding: 0.4rem 0.6rem;
  font-size: 1rem;
  line-height: 1;
}

.theme-toggle:hover {
  background: #ffffff !important;
}

.theme-icon-light,
.theme-icon-dark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.2em;
  height: 1.2em;
}

body:not(.dark) .theme-icon-dark {
  display: none;
}

body.dark .theme-icon-light {
  display: none;
}

.lang-active {
  color: var(--color-accent);
}

.lang-divider {
  color: var(--color-text-secondary);
  margin: 0 0.25rem;
  opacity: 0.5;
}

.lang-inactive {
  color: var(--color-text-secondary);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.section {
  margin-bottom: 4rem;
}

.section:last-child {
  margin-bottom: 0;
}

.section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
  letter-spacing: -0.01em;
}

.research-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.research-list li {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  padding: 1.25rem 1.5rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text);
  transition: all var(--transition);
}

.research-list li:hover {
  box-shadow: var(--shadow-sm);
  border-left-color: var(--color-accent-light);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 0;
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  align-items: stretch;
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
}

.card-director {
  border-left: 4px solid var(--color-accent);
}

.card-avatar {
  flex-shrink: 0;
  width: 120px;
  align-self: stretch;
  overflow: hidden;
  background: var(--color-accent-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.avatar-placeholder {
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.05em;
}

.card-content {
  flex: 1;
  min-width: 0;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card-content h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.card-role {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.card-link {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: #5a1d7a;
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(107, 45, 139, 0.12);
  transition: all var(--transition);
}

.card-link:hover {
  background: var(--color-accent);
  color: #ffffff;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.pub-year {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
  border-left: 3px solid var(--color-accent);
}

.pub-year:first-child {
  margin-top: 0;
}

.pub-item {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  transition: all var(--transition);
}

.pub-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-accent-light);
}

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.35rem;
  line-height: 1.4;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.pub-authors strong {
  color: var(--color-text);
  font-weight: 500;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pub-link {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #5a1d7a;
  text-decoration: none;
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  background: rgba(107, 45, 139, 0.12);
  transition: all var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.pub-link:hover {
  background: var(--color-accent);
  color: #ffffff;
}

.contact-box {
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
}

.contact-box p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.email-link {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  color: #5a1d7a;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background: rgba(107, 45, 139, 0.12);
  transition: all var(--transition);
  margin-bottom: 1rem;
}

.email-link:hover {
  background: var(--color-accent);
  color: #ffffff;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  align-items: center;
  margin-top: 1rem;
}

.contact-links a {
  color: #5a1d7a;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: color var(--transition);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
}

.contact-links a:hover {
  color: var(--color-accent-light);
  text-decoration: underline;
}

body.dark .contact-links a:hover {
  color: var(--color-accent-light);
}

.separator {
  color: var(--color-border);
  font-weight: 300;
}

.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  text-align: center;
  padding: 2rem 1.5rem;
  margin-top: 4rem;
}

.site-footer p {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.footer-note {
  font-size: 0.8rem !important;
  opacity: 0.7;
}

.lang-es,
.lang-en {
  display: inline;
}

body.lang-en .lang-es {
  display: none !important;
}

body:not(.lang-en) .lang-en {
  display: none !important;
}

@media (max-width: 768px) {
  .container {
    padding: 2rem 1rem;
  }

  .header-inner {
    flex-direction: column;
    padding: 0.5rem 1rem;
    gap: 0.5rem;
  }

  .header-logo {
    margin-bottom: 0;
    width: 100%;
    padding: 0;
    order: 1;
  }

  .header-logo img {
    max-width: 100%;
    max-height: 150px;
    width: auto;
  }

  .header-controls {
    position: static;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.25rem 0;
    order: 2;
  }

  .header-center {
    border-radius: 0;
    width: 100%;
    position: relative;
    padding-top: 0;
    order: 3;
  }

  .header-image img {
    max-height: 130px;
  }

  .header-overlay {
    padding: 0.6rem 0.75rem;
  }

  .header-overlay h1 {
    font-size: 0.9rem;
    line-height: 1.35;
  }

  .site-header {
    position: relative;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .lang-toggle,
  .theme-toggle {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }

  .theme-toggle {
    font-size: 0.9rem;
  }

  .contact-links {
    flex-direction: column;
    gap: 0.75rem;
  }

  .separator {
    display: none;
  }

  .pub-item {
    padding: 1rem;
  }

  .pub-title {
    font-size: 0.95rem;
  }

  .research-list li {
    padding: 1rem;
    font-size: 0.9rem;
  }

  .card-avatar {
    width: 90px;
  }

  .avatar-placeholder {
    font-size: 1.2rem;
  }

  .card-content {
    padding: 1rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}