/* ==========================================================================
   CITERRA - Red de Investigación Científica para el Desarrollo Sostenible
   Design System: Minimalismo Científico Institucional
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Paleta Institucional extraída del Logo */
  --citerra-navy: #0E387A;
  --citerra-navy-dark: #08214D;
  --citerra-navy-light: #1A4D9F;
  --citerra-navy-subtle: #EEF4FC;

  --citerra-green: #16A34A;
  --citerra-green-dark: #15803D;
  --citerra-green-light: #22C55E;
  --citerra-green-subtle: #EAF8EF;

  --citerra-cyan: #0284C7;
  --citerra-amber: #D97706;

  /* Superficies y Neutros Científicos */
  --bg-body: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-muted: #F1F5F9;
  --bg-dark: #0A192F;
  --bg-dark-surface: #112240;

  --text-main: #0F172A;
  --text-muted: #475569;
  --text-subtle: #64748B;
  --text-inverse: #F8FAFC;

  --border-color: #E2E8F0;
  --border-hover: #CBD5E1;
  --border-active: #0E387A;

  /* Elevaciones sutiles (Sin exceso de sombras pesadas) */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.03);

  /* Espaciados y Radios */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --container-max: 1300px;
  --header-height: 104px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Reset y Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 90%; /* Escala al 90% (14.4px base) para una proporción equilibrada y legible */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--citerra-navy);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--citerra-green-dark);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Contenedores */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-narrow {
  max-width: 900px;
}

/* Tipografía Científica */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--citerra-navy);
  background-color: var(--citerra-navy-subtle);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  border: 1px solid rgba(14, 56, 122, 0.15);
}

.section-tag.green {
  color: var(--citerra-green-dark);
  background-color: var(--citerra-green-subtle);
  border-color: rgba(22, 163, 74, 0.2);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header.text-center {
  text-align: center;
}

.section-header.text-center .section-tag {
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 720px;
  line-height: 1.6;
}

.section-header.text-center .section-description {
  margin-left: auto;
  margin-right: auto;
}

/* Top bar institucional */
.top-bar {
  background-color: var(--citerra-navy-dark);
  color: #CBD5E1;
  font-size: 0.8125rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.top-bar-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.top-bar-links a {
  color: #94A3B8;
  font-size: 0.8125rem;
  transition: color var(--transition-fast);
}

.top-bar-links a:hover {
  color: #FFFFFF;
}

.top-bar-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: #86EFAC;
}

.top-bar-badge::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--citerra-green-light);
}

/* Header & Barra de Navegación */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 3px 0 rgba(15, 23, 42, 0.04);
  transition: all var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  height: 100%;
}

.brand-logo img {
  height: 103px;
  max-height: 98%;
  width: auto;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.brand-logo:hover img {
  transform: scale(1.02);
}

/* Menú Principal */
.main-nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-main);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover {
  color: var(--citerra-navy);
  background-color: var(--citerra-navy-subtle);
}

.nav-link.active {
  color: var(--citerra-navy);
  font-weight: 600;
  background-color: var(--citerra-navy-subtle);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0.85rem;
  right: 0.85rem;
  height: 3px;
  background-color: var(--citerra-green);
  border-radius: var(--radius-full);
}

.nav-cta {
  margin-left: 0.5rem;
}

/* Botón Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-main);
}

.mobile-menu-btn:hover {
  background-color: var(--bg-muted);
}

/* Botones y Acciones */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.3;
}

.btn-primary {
  background-color: var(--citerra-navy);
  color: #FFFFFF !important;
  border-color: var(--citerra-navy);
}

.btn-primary:hover {
  background-color: var(--citerra-navy-dark);
  border-color: var(--citerra-navy-dark);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--citerra-green);
  color: #FFFFFF !important;
  border-color: var(--citerra-green);
}

.btn-secondary:hover {
  background-color: var(--citerra-green-dark);
  border-color: var(--citerra-green-dark);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--citerra-navy);
  border-color: var(--border-color);
}

.btn-outline:hover {
  background-color: var(--bg-surface);
  border-color: var(--citerra-navy);
  color: var(--citerra-navy);
}

.btn-outline-green {
  background-color: transparent;
  color: var(--citerra-green-dark);
  border-color: rgba(22, 163, 74, 0.3);
}

.btn-outline-green:hover {
  background-color: var(--citerra-green-subtle);
  border-color: var(--citerra-green);
  color: var(--citerra-green-dark);
}

.btn-sm {
  font-size: 0.8125rem;
  padding: 0.4rem 0.85rem;
}

.btn-lg {
  font-size: 1.0625rem;
  padding: 0.85rem 1.75rem;
}

/* Tarjetas Científicas */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all var(--transition-fast);
  position: relative;
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

/* Badges y Etiquetas */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-muted);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.badge-navy {
  background-color: var(--citerra-navy-subtle);
  color: var(--citerra-navy);
  border-color: rgba(14, 56, 122, 0.2);
}

.badge-green {
  background-color: var(--citerra-green-subtle);
  color: var(--citerra-green-dark);
  border-color: rgba(22, 163, 74, 0.2);
}

.badge-cyan {
  background-color: #E0F2FE;
  color: #0369A1;
  border-color: rgba(2, 132, 199, 0.2);
}

.badge-amber {
  background-color: #FEF3C7;
  color: #B45309;
  border-color: rgba(217, 119, 6, 0.2);
}

.badge-ods {
  background-color: #0F172A;
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

/* Formularios y Búsqueda */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  color: var(--text-main);
  transition: all var(--transition-fast);
  font-size: 0.9375rem;
}

.form-control:focus {
  outline: none;
  border-color: var(--citerra-navy);
  box-shadow: 0 0 0 3px rgba(14, 56, 122, 0.12);
}

.search-box {
  position: relative;
  width: 100%;
}

.search-box input {
  padding-left: 2.6rem;
}

.search-box-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  pointer-events: none;
}

/* Secciones */
.section {
  padding: 4.5rem 0;
}

.section-subtle {
  background-color: var(--bg-muted);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: #FFFFFF;
}

.section-dark .section-description {
  color: #94A3B8;
}

/* Page Hero Header */
.page-hero {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-body) 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 3.5rem 0 2.75rem;
}

.page-hero-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--citerra-navy);
  margin-bottom: 0.6rem;
  letter-spacing: -0.03em;
}

.page-hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 820px;
  line-height: 1.6;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-subtle);
  margin-bottom: 1rem;
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--citerra-navy);
}

/* Modales */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 740px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal-dialog {
  transform: translateY(0);
}

.modal-header {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.modal-title {
  font-size: 1.25rem;
  color: var(--citerra-navy);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-subtle);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  color: var(--text-main);
  background-color: var(--bg-muted);
}

.modal-body {
  padding: 1.75rem;
}

.modal-footer {
  padding: 1.25rem 1.75rem;
  background-color: var(--bg-muted);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background-color: var(--text-main);
  color: #FFFFFF;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: toastIn 0.3s ease;
  border-left: 4px solid var(--citerra-green);
}

@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Footer Institucional */
.site-footer {
  background-color: #07152B;
  color: #94A3B8;
  padding-top: 4.5rem;
  padding-bottom: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr 1.5fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-logo img {
  height: 48px;
  background: white;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.footer-brand-title {
  color: #FFFFFF;
  font-size: 1.2rem;
  font-weight: 800;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  color: #94A3B8;
}

.footer-heading {
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  color: #94A3B8;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: #38BDF8;
  padding-left: 3px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.footer-contact-item svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--citerra-green-light);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: #64748B;
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  color: #64748B;
}

.footer-bottom-links a:hover {
  color: #94A3B8;
}

/* Responsividad */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 860px) {
  :root {
    --header-height: 84px;
  }

  .brand-logo img {
    height: 77px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    flex-direction: column;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    gap: 0.5rem;
  }

  .main-nav.open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .nav-link.active::after {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

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

  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
}