/* ==========================================================================
   W2E INGENIERÍA SpA - HOJA DE ESTILOS PRINCIPAL
   Ubicación: assets/css/styles.css
   Diseño: Sobrio, técnico, accesible y responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. VARIABLES CSS Y TEMA
   -------------------------------------------------------------------------- */
:root {
  /* Paleta Corporativa Verde Ambiental y Grafito */
  --color-primary: #1b4d3e;
  --color-primary-hover: #12382c;
  --color-primary-light: #eaf3ef;
  --color-secondary: #2c3e50;
  --color-secondary-hover: #1e2b38;
  --color-dark: #19231f;
  --color-light: #f4f6f5;
  --color-surface: #ffffff;
  --color-background: #f7f9f8;
  --color-border: #d4ded9;
  --color-border-dark: #b1c2bb;
  --color-text: #212a26;
  --color-muted: #54655f;
  --color-accent: #2b7a58;
  --color-error: #b91c1c;
  --color-success: #15803d;
  --color-warning: #b45309;

  /* Tipografía */
  --font-main: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Layout y Espaciado */
  --max-width: 1200px;
  --max-width-narrow: 840px;
  --header-height: 80px;

  /* Bordes y Sombras */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);

  /* Transiciones */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Iteración estratégica 2026: composición comercial, experiencia e imágenes */
.btn-icon {
  width: 1.15em;
  height: 1.15em;
  flex: 0 0 auto;
  fill: currentColor;
}

.hero-visual {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background: var(--color-dark);
}

.hero-visual picture,
.hero-visual img {
  display: block;
  width: 100%;
}

.hero-visual img {
  height: clamp(340px, 42vw, 500px);
  object-fit: cover;
}

.hero-proof {
  position: absolute;
  inset: auto 1rem 1rem;
  display: grid;
  gap: .45rem;
  padding: 1rem;
  color: #fff;
  background: rgba(18, 56, 44, .92);
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: var(--radius-md);
  backdrop-filter: blur(7px);
}

.hero-proof span {
  line-height: 1.35;
}

.hero-proof strong {
  font-size: 1.35rem;
  margin-right: .25rem;
}

.process-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.process-step {
  min-height: 190px;
}

.experience-grid-priority {
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
}

.case-card-primary {
  border-top: 4px solid var(--color-primary);
}

.experience-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}

.experience-facts span {
  display: block;
  padding: 1rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
}

.experience-facts strong {
  display: block;
  color: var(--color-primary);
  font-size: 1.8rem;
  line-height: 1;
}

.experience-stack {
  display: grid;
  gap: 1.5rem;
}

.experience-stack .case-card {
  padding: clamp(1.35rem, 3vw, 2.2rem);
}

.experience-list,
.service-guidance ul,
.why-w2e ul {
  padding-left: 1.25rem;
}

.section-cta,
.why-w2e {
  margin-top: 2.5rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--color-primary-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

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

.service-guidance {
  padding: 1.5rem;
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.service-guidance > strong {
  display: block;
  margin-bottom: .6rem;
  color: var(--color-primary);
}

.service-guidance li {
  margin-bottom: .35rem;
}

.service-guidance p {
  margin: .75rem 0 0;
  font-size: .9rem;
  color: var(--color-muted);
}

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

.collaborator-card {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  align-items: center;
  min-height: 140px;
}

.collaborator-logo-container {
  height: 110px;
  width: 130px;
}

.collaborator-logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.fic-project-logo {
  display: block;
  width: clamp(180px, 20vw, 240px);
  height: auto;
  margin-inline: auto;
}

.fic-bip {
  display: inline-block;
  margin-top: .35rem;
  font-size: 1rem;
  color: #fff;
}

@media (max-width: 1024px) {
  .process-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .experience-grid-priority {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-visual img {
    height: 420px;
  }

  .hero-proof {
    position: static;
    border-radius: 0;
  }

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

  .process-step {
    min-height: 0;
  }

  .experience-facts {
    grid-template-columns: 1fr;
  }

  .collaborator-card {
    grid-template-columns: 100px minmax(0, 1fr);
    min-height: 120px;
  }

  .collaborator-logo-container {
    width: 90px;
    height: 90px;
  }
}

/* --------------------------------------------------------------------------
   2. RESET Y ESTILOS BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accesibilidad - Enlace de salto al contenido principal */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-primary);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--color-dark);
}

/* Foco visible para accesibilidad mediante teclado */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

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

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: var(--color-primary-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-dark);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 0.85rem;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  margin-bottom: 0.65rem;
}

h4 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1.25rem;
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

/* --------------------------------------------------------------------------
   3. LAYOUT GENERAL Y CONTENEDORES
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
}

.section-alt {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

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

.section-subtitle {
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-description {
  font-size: 1.15rem;
  color: var(--color-muted);
  max-width: 760px;
  margin-top: 0.5rem;
}

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

/* Main Layout Wrapper */
main {
  flex: 1 0 auto;
}

/* --------------------------------------------------------------------------
   4. ENCABEZADO Y NAVEGACIÓN (STICKY)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo Brand */
.brand-logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 0.75rem;
}

.brand-logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.brand-text-fallback {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--color-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Menú de Navegación de Escritorio */
.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 0.5rem 0.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-bottom: 2px solid transparent;
  transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Desplegable de Servicios */
.dropdown-toggle {
  background: none;
  border: none;
  font: inherit;
  cursor: pointer;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 320px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.75rem 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  z-index: 1010;
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu,
.dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: 0.6rem 1.25rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.3;
}

.dropdown-link:hover,
.dropdown-link:focus {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Botón Hamburguesa Móvil */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-dark);
  align-items: center;
  justify-content: center;
}

.mobile-nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* Header Action CTA */
.header-cta {
  display: inline-block;
}

/* --------------------------------------------------------------------------
   5. BOTONES Y ACCIONES
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
  line-height: 1.2;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: #ffffff;
  border-color: var(--color-secondary);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: var(--color-secondary-hover);
  border-color: var(--color-secondary-hover);
  color: #ffffff;
}

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

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--color-primary-light);
  color: var(--color-primary-hover);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.9rem 1.8rem;
  font-size: 1.05rem;
}

/* --------------------------------------------------------------------------
   6. SECCIÓN HERO (PORTADA)
   -------------------------------------------------------------------------- */
.hero-section {
  background: linear-gradient(135deg, #f0f5f2 0%, #e3ece8 100%);
  border-bottom: 1px solid var(--color-border);
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  color: var(--color-dark);
  margin-bottom: 1.25rem;
  line-height: 1.2;
}

.hero-lead {
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 2rem;
  max-width: 650px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  background-color: rgba(27, 77, 62, 0.08);
  border: 1px solid rgba(27, 77, 62, 0.2);
  border-radius: 50px;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-footer-note {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--color-muted);
  font-weight: 500;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}

/* Hero Graphic Construct - No stock photo dependency */
.hero-graphic {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.technical-card-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.technical-tag {
  font-family: monospace;
  font-size: 0.8rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.hero-feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.hero-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.hero-feature-icon {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

/* --------------------------------------------------------------------------
   7. SECCIÓN PROBLEMAS QUE AYUDAMOS A RESOLVER
   -------------------------------------------------------------------------- */
.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.problem-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.problem-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.problem-card h3 {
  font-size: 1.15rem;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.problem-card p {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   8. TARJETAS DE SERVICIOS
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.service-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  height: 100%;
}

.service-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-dark);
}

.service-icon-box {
  width: 48px;
  height: 48px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.service-icon-box svg {
  width: 26px;
  height: 26px;
}

.service-title {
  font-size: 1.3rem;
  color: var(--color-dark);
  margin-bottom: 0.75rem;
}

.service-description {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}

.service-scope-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-dark);
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.service-scope-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  flex-grow: 1;
}

.service-scope-list li {
  font-size: 0.9rem;
  color: var(--color-text);
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.4rem;
}

.service-scope-list li::before {
  content: "•";
  color: var(--color-primary);
  font-weight: bold;
  position: absolute;
  left: 0;
}

.service-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: auto;
}

.service-link:hover,
.service-link:focus {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   9. SECCIÓN "CÓMO TRABAJAMOS" (PROCESO)
   -------------------------------------------------------------------------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.process-step {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
}

.process-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.75rem;
  display: block;
}

.process-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
}

.process-desc {
  font-size: 0.88rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

.process-disclaimer {
  background-color: var(--color-primary-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  font-size: 0.95rem;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   10. TARJETAS DE EXPERIENCIA Y CASOS
   -------------------------------------------------------------------------- */
.experience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.case-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.case-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.case-tag {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  align-self: flex-start;
}

.case-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.case-desc {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}

.case-scopes-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.case-scope-pill {
  font-size: 0.8rem;
  background-color: var(--color-light);
  border: 1px solid var(--color-border);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   11. FIC BIOGÁS ÑUBLE SPOTLIGHT / MICROSITIO
   -------------------------------------------------------------------------- */
.fic-spotlight {
  background: linear-gradient(135deg, #1b4d3e 0%, #12382c 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 3rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.fic-spotlight h2, .fic-spotlight h3 {
  color: #ffffff;
}

.fic-spotlight p {
  color: #d1e2db;
  font-size: 1.05rem;
}

.fic-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 2rem;
}

.fic-meta-item {
  display: flex;
  flex-direction: column;
}

.fic-meta-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: #a3c9b9;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.fic-meta-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
}

/* Logos Institucionales en FIC */
.fic-logos-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  margin-top: 2rem;
}

.fic-logo-item {
  height: 55px;
  max-width: 160px;
  object-fit: contain;
  filter: grayscale(20%);
  transition: filter var(--transition-fast);
}

.fic-logo-item:hover {
  filter: grayscale(0%);
}

/* Galería de fotografías del proyecto FIC */
.photo-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.gallery-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.gallery-img-wrapper {
  aspect-ratio: 4/3;
  width: 100%;
  overflow: hidden;
  background-color: var(--color-light);
  position: relative;
}

.gallery-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.gallery-card:hover .gallery-img-wrapper img {
  transform: scale(1.04);
}

.gallery-caption {
  padding: 1rem;
  font-size: 0.88rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

/* Fallback visual cuando la imagen no carga en local */
.img-fallback-box {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: #e5ece8;
  color: var(--color-muted);
  padding: 1rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   12. SECCIÓN NOSOTROS Y COLABORADORES
   -------------------------------------------------------------------------- */
.collaborators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.collaborator-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.collaborator-logo-container {
  height: 60px;
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
}

.collaborator-logo-img {
  max-height: 50px;
  max-width: 180px;
  object-fit: contain;
}

/* --------------------------------------------------------------------------
   13. FORMULARIO DE CONTACTO ACCESIBLE
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

.contact-info-panel {
  background-color: var(--color-primary-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.contact-info-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.contact-info-icon {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.contact-channel-label {
  color: var(--color-text);
  text-decoration: none;
}

.fillout-heading {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.contact-home-actions-card {
  padding: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.contact-home-actions-card h3 {
  margin-bottom: 0.5rem;
}

.contact-home-actions-card p {
  margin-bottom: 1.25rem;
}

.contact-home-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
}

.contact-home-actions .btn {
  width: 100%;
}

.contact-whatsapp-channel {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.contact-whatsapp-channel h3 {
  margin-bottom: 0.4rem;
  font-size: 1.1rem;
}

.contact-whatsapp-channel p {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

body.mobile-nav-open {
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   14. ESTILOS DE RECURSO TÉCNICO CITABLE (BIOGÁS PAPER)
   -------------------------------------------------------------------------- */
.paper-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 5vw, 3.5rem);
  box-shadow: var(--shadow-sm);
}

.paper-header {
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
}

.paper-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  background-color: var(--color-light);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: 1.5rem;
}

.paper-abstract-box {
  background-color: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.paper-abstract-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.citation-box {
  background-color: #f1f5f3;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 2.5rem;
  font-family: monospace;
  font-size: 0.88rem;
  color: var(--color-text);
  word-break: break-all;
}

/* Diagrams SVG en línea */
.technical-diagram-wrapper {
  background-color: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  text-align: center;
}

.technical-diagram-wrapper svg {
  max-width: 100%;
  margin: 0 auto;
}

.technical-resource .paper-header h1 {
  margin-bottom: 0.5rem;
  font-size: clamp(2rem, 5vw, 3rem);
}

.resource-kicker {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.resource-subtitle {
  max-width: 48rem;
  margin-bottom: 1.5rem;
  color: var(--color-muted);
  font-size: 1.1rem;
}

.resource-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 0 0 1.5rem;
}

.resource-meta div {
  padding: 0.9rem 1rem;
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.resource-meta dt {
  margin-bottom: 0.2rem;
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.resource-meta dd {
  margin: 0;
}

.resource-context,
.resource-credits {
  margin-bottom: 1.25rem;
}

.resource-credits ul {
  margin: 0.5rem 0 0 1.25rem;
}

.technical-disclaimer {
  padding: 1rem 1.1rem;
  color: var(--color-text);
  background: #fffaf0;
  border: 1px solid #ead7b2;
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-sm);
}

.source-document-content {
  margin-top: 2.5rem;
  font-size: 1.025rem;
  line-height: 1.75;
}

.source-document-content h2 {
  margin-bottom: 1.5rem;
  font-size: clamp(1.65rem, 3vw, 2.15rem);
}

.source-document-content h3 {
  margin-top: 2.25rem;
  margin-bottom: 0.8rem;
  font-size: clamp(1.3rem, 2.3vw, 1.65rem);
}

.source-figure {
  margin: 1.75rem 0 2.25rem;
}

.source-figure figcaption {
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.source-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.source-table {
  display: block;
  width: 100%;
  height: auto;
  margin-inline: auto;
}

.source-table-compact {
  max-width: 52rem;
}

.source-table-narrow {
  max-width: 486px;
}

.service-detail-block {
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}

.source-note {
  margin-top: 0.65rem;
  color: var(--color-muted);
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.source-references {
  margin-left: 1.3rem;
  font-size: 0.94rem;
  list-style: none;
}

.source-references li {
  margin-bottom: 0.8rem;
  padding-left: 0.35rem;
  overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   15. PIE DE PÁGINA (FOOTER)
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-dark);
  color: #e2e8f0;
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  margin-top: auto;
  font-size: 0.925rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: #a0aec0;
  font-size: 0.9rem;
  margin-top: 0.75rem;
}

.footer-heading {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #cbd5e0;
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus {
  color: #ffffff;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: #718096;
  font-size: 0.85rem;
}

/* Breadcrumbs Component */
.breadcrumbs-nav {
  padding: 1rem 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
}

.breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0.5rem;
}

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

.breadcrumbs-item a {
  color: var(--color-text);
  text-decoration: none;
}

.breadcrumbs-item a:hover {
  text-decoration: underline;
}

.breadcrumbs-separator {
  color: var(--color-border-dark);
}

/* --------------------------------------------------------------------------
   16. MEDIA QUERIES (RESPONSIVE DESIGN)
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
  }

  .section {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  .header-cta {
    display: none;
  }

  .mobile-nav-toggle {
    display: flex;
  }

  /* Menú Hamburguesa Móvil Desplegable */
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem 1.5rem;
    overflow-y: auto;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }

  .main-nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 1.25rem;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    font-size: 1.1rem;
    width: 100%;
    justify-content: space-between;
    padding: 0.5rem 0;
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-primary);
    border-radius: 0;
    width: 100%;
    padding: 0.5rem 0 0.5rem 1rem;
    margin-top: 0.5rem;
    display: none;
  }

  .nav-item.has-dropdown.active .dropdown-menu {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-grid-wrapper {
    grid-template-columns: minmax(0, 1fr) !important;
  }

  .resource-meta,
  .service-detail-grid {
    grid-template-columns: minmax(0, 1fr) !important;
  }

  .technical-resource {
    padding: 1.25rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .services-grid,
  .problems-grid,
  .experience-grid {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Overrides finales de la iteración estratégica */
.process-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.collaborators-grid { grid-template-columns: 1fr; }
.collaborator-card {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  align-items: center;
  min-height: 140px;
}
.collaborator-logo-container { width: 130px; height: 110px; }
.collaborator-logo-img { width: 100%; height: 100%; object-fit: contain; }

@media (max-width: 1024px) {
  .process-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .process-grid { grid-template-columns: 1fr; }
  .collaborator-card { grid-template-columns: 100px minmax(0, 1fr); min-height: 120px; }
  .collaborator-logo-container { width: 90px; height: 90px; }
  .fic-hero-grid { grid-template-columns: 1fr !important; }
  .fic-project-logo { width: min(220px, 100%) !important; }
}

/* Acciones exclusivas de WhatsApp */
.btn-whatsapp {
  color: #fff;
  background-color: #25d366;
  border-color: #25d366;
}

.btn-whatsapp:hover {
  color: #fff;
  background-color: #1eae54;
  border-color: #1eae54;
}

.btn-whatsapp:focus-visible {
  color: #fff;
  outline: 3px solid #0f5132;
  outline-offset: 3px;
}

.btn-whatsapp:active {
  color: #fff;
  background-color: #188c44;
  border-color: #188c44;
  transform: translateY(1px);
}

/* Pie técnico y evidencias del hero */
.hero-visual-column {
  min-width: 0;
}

.hero-section .hero-grid {
  grid-template-columns: minmax(0, 1.27fr) minmax(0, 1fr);
  gap: 2.25rem;
}

.hero-section .hero-visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: 42% 55%;
}

.hero-technical-caption {
  position: absolute;
  inset: auto auto .75rem .75rem;
  width: min(70%, 390px);
  padding: .45rem .6rem;
  color: #fff;
  background: rgba(10, 16, 14, .7);
  border-radius: 5px;
  font-size: .7rem;
  font-weight: 400;
  line-height: 1.25;
}

.hero-evidence {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: .65rem;
  overflow: hidden;
  color: var(--color-text);
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: .88rem;
  line-height: 1.35;
}

.hero-evidence span {
  padding: .8rem .85rem;
  background: var(--color-surface);
}

/* Equilibrio visual de capacidades complementarias */
.collaborator-card-gaia {
  grid-template-columns: 125px minmax(0, 1fr);
}

.collaborator-card-gaia .collaborator-logo-container {
  width: 115px;
  height: 96px;
  margin-bottom: 0;
}

.collaborator-card-gaia .collaborator-logo-img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

@media (max-width: 768px) {
  .collaborator-card-gaia {
    grid-template-columns: 110px minmax(0, 1fr);
  }

  .collaborator-card-gaia .collaborator-logo-container {
    width: 100px;
    height: 84px;
  }

  .hero-technical-caption {
    inset: auto .5rem .5rem;
    width: auto;
    padding: .35rem .5rem;
    font-size: .7rem;
    line-height: 1.2;
  }

  .hero-evidence {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 992px) {
  .hero-section .hero-grid {
    grid-template-columns: 1fr;
  }
}

/* Renderizado íntegro del encuadre 4:3 optimizado */
.hero-media {
  overflow: visible;
  background: transparent;
  box-shadow: none;
}

.hero-media picture {
  display: block;
  width: 100%;
}

.hero-section .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: auto;
  object-fit: contain;
  object-position: center;
  border-radius: var(--radius-lg);
}

@media (max-width: 420px) {
  .collaborator-card,
  .collaborator-card-gaia {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .collaborator-logo-container,
  .collaborator-card-gaia .collaborator-logo-container {
    margin-inline: auto;
  }
}