/* ============================================
   CY DESARROLLO TÉRMICO - ESTILOS SECCIÓN BLOG
   ============================================ */

/* ── COMPORTAMIENTO NAVBAR EN EL BLOG ── */
#navbar .nav-links a.active {
  color: var(--rojo);
}

#navbar .nav-links a.active::after {
  width: 100%;
}

#navbar.scrolled .nav-links a.active {
  color: var(--rojo);
}

/* ── HERO BLOG ── */
#blog-hero {
  position: relative;
  min-height: 55vh;
  display: flex;
  align-items: center;
  padding: 160px 8% 80px;
  background-image: url('../assets/imagenes/mantenimiento-a-calderas-en-nuevo-leon.webp');
  background-size: cover;
  background-position: center;
  background-attachment: scroll;
  color: #FFFFFF;
  overflow: hidden;
}

#blog-hero .hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
      rgba(10, 10, 14, 0.95) 0%,
      rgba(10, 10, 14, 0.7) 60%,
      rgba(10, 10, 14, 0.4) 100%);
  z-index: 1;
}

#blog-hero .hero-content {
  position: relative;
  inset: auto;
  /* Anula posicionamiento absoluto de styles.css */
  z-index: 2;
  max-width: 800px;
  padding: 0;
  display: block;
}

#blog-hero .hero-titulo {
  font-family: var(--fuente-titulo);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  line-height: 1.1;
  letter-spacing: 2px;
  margin-bottom: 20px;
  color: #FFFFFF;
}

#blog-hero .hero-subtitulo {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.6;
  color: #E2E2E9;
  max-width: 700px;
  margin-bottom: 0;
}

/* ── GRID DE FEED ── */
#blog-feed {
  padding: 100px 8%;
  background: var(--negro);
  /* Hereda #FFFFFF */
}

.feed-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.feed-header .section-desc {
  margin: 16px auto 0;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ── TARJETA DE ARTÍCULO (BLOG CARD) ── */
.blog-card {
  background: #FFFFFF;
  /* Forzar fondo blanco limpio */
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--gris-med);
  display: flex;
  flex-direction: column;
  transition: transform var(--transicion), box-shadow var(--transicion), border-color var(--transicion);
}

.blog-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1), 0 0 30px rgba(200, 16, 46, 0.06);
  border-color: rgba(200, 16, 46, 0.18);
}

.blog-card-img-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
}

.blog-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.blog-card:hover .blog-card-img-wrap img {
  transform: scale(1.06);
}

.blog-card-category {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--rojo);
  color: #FFFFFF;
  font-family: var(--fuente-cond);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 3px;
  z-index: 2;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.blog-card-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.blog-card-date {
  font-family: var(--fuente-cond);
  font-size: 0.8rem;
  color: var(--gris-text);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}

.blog-card-title {
  font-family: var(--fuente-cond);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  color: #0A0A0A;
  /* Texto negro */
  margin-bottom: 12px;
  transition: color var(--transicion);
}

.blog-card:hover .blog-card-title {
  color: var(--rojo);
}

.blog-card-excerpt {
  font-size: 0.92rem;
  color: var(--gris-text);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--rojo);
  font-family: var(--fuente-cond);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: color var(--transicion);
  width: fit-content;
  margin-top: auto;
}

.blog-card-link svg {
  transition: transform var(--transicion);
}

.blog-card:hover .blog-card-link svg {
  transform: translateX(4px);
}

.blog-card-link:hover {
  color: var(--rojo-vivo);
}

/* ── SECCIÓN CTA BLOG ── */
#blog-cta {
  background: #0B0B0E;
  padding: 90px 8%;
  color: #FFFFFF;
  border-top: 3px solid var(--rojo);
}

.cta-container {
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

.cta-badge {
  display: inline-block;
  background: rgba(200, 16, 46, 0.12);
  border: 1px solid var(--rojo);
  color: #FFCC00;
  padding: 6px 16px;
  font-family: var(--fuente-cond);
  font-size: 0.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  border-radius: 4px;
  margin-bottom: 24px;
}

.cta-title {
  font-family: var(--fuente-titulo);
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: 2px;
  line-height: 1.1;
  margin-bottom: 20px;
}

.cta-description {
  font-size: 1.05rem;
  color: #A0A0AB;
  max-width: 750px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

.cta-contacts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  text-align: left;
}

.cta-group h3 {
  font-family: var(--fuente-cond);
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #FFCC00;
  margin-bottom: 20px;
  border-left: 3px solid var(--rojo);
  padding-left: 12px;
}

.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cta-buttons .btn {
  justify-content: center;
  font-size: 0.95rem;
  padding: 16px 24px;
  width: 100%;
}

.btn-whatsapp {
  background: #25D366;
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover {
  background: #20BA56;
  box-shadow: 0 6px 24px rgba(37, 211, 102, 0.5);
  transform: translateY(-2px);
  color: #FFFFFF;
}

.cta-buttons .btn-outline {
  border-color: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
}

.cta-buttons .btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

.cta-buttons .btn-email:hover {
  border-color: var(--rojo);
  background: rgba(200, 16, 46, 0.1);
}

/* ── RESPONSIVE BLOG ── */
@media (max-width: 1024px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }

  .cta-contacts {
    gap: 30px;
  }
}

@media (max-width: 768px) {
  #blog-hero {
    min-height: 45vh;
    padding-top: 130px;
    padding-bottom: 60px;
  }

  #blog-feed {
    padding: 60px 5%;
  }

  .blog-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .cta-contacts {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  #blog-cta {
    padding: 60px 5%;
  }
}

@media (max-width: 480px) {
  .blog-card-img-wrap {
    height: 180px;
  }

  .blog-card-title {
    font-size: 1.2rem;
  }

  .cta-buttons .btn {
    font-size: 0.85rem;
    padding: 14px 18px;
  }
}
/* ── ARTICULOS RELACIONADOS (interlinking) ── */
.related-posts {
  padding: 90px 8% 100px;
  background: var(--gris-osc);
  border-top: 1px solid var(--gris-borde);
}

.related-container {
  max-width: 1200px;
  margin: 0 auto;
}

.related-header {
  max-width: 700px;
  margin: 0 auto 50px;
  text-align: center;
}

.related-header .section-label {
  justify-content: center;
}

.related-titulo {
  font-family: var(--fuente-titulo);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
  letter-spacing: 1px;
  margin-bottom: 0;
  color: #0A0A0A;
}

@media (max-width: 768px) {
  .related-posts {
    padding: 60px 5%;
  }
}

/* ── Índice de contenidos (TOC) ── */
.toc {
  background: #FFFFFF;
  border: 1px solid var(--gris-borde);
  border-left: 4px solid var(--rojo);
  border-radius: 8px;
  padding: 24px 28px;
  margin: 0 0 40px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.toc-titulo {
  font-family: var(--fuente-titulo);
  font-size: 1.5rem;
  letter-spacing: 1px;
  color: var(--rojo);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.toc-lista {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 28px;
}

.toc-lista li {
  margin: 0;
  padding-left: 20px;
  position: relative;
}

.toc-lista li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--rojo);
}

.toc-lista a {
  color: var(--gris-text);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transicion);
}

.toc-lista a:hover {
  color: var(--rojo);
}

/* anclas con compensación para el header fijo */
h2[id] {
  scroll-margin-top: 100px;
}

@media (max-width: 768px) {
  .toc {
    padding: 20px 22px;
  }
  .toc-lista {
    grid-template-columns: 1fr;
  }
}

/* ── Migas de pan (breadcrumbs) ── */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--fuente-cond);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 18px;
  color: var(--gris-text);
}

.breadcrumbs a {
  color: var(--rojo);
  text-decoration: none;
  transition: color var(--transicion);
}

.breadcrumbs a:hover {
  color: var(--rojo-osc);
  text-decoration: underline;
}

.bc-sep {
  color: var(--gris-borde);
  font-size: 1.1rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
}

.bc-actual {
  color: var(--gris-text);
  max-width: 420px;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 768px) {
  .breadcrumbs {
    font-size: 0.78rem;
    gap: 6px;
  }
  .bc-actual {
    max-width: 240px;
  }
}

/* ════════════════════════════════════════════════════════
   PERFORMANCE MÓVIL: content-visibility bajo el fold
   Difiere el render de secciones fuera de pantalla (LCP/INP)
   sin cambiar el diseño. contain-intrinsic-size evita CLS.
════════════════════════════════════════════════════════ */
#blog-feed, #blog-cta, #faq, .related-posts, footer {
  content-visibility: auto;
  contain-intrinsic-size: auto 600px;
}

.blog-card {
  content-visibility: auto;
  contain-intrinsic-size: auto 420px;
}