/* ============================================
   BLOG.CSS — Página de Recursos Técnicos
   Estética académica-industrial: journal técnico,
   manual de ingeniería, centro de referencia
   ============================================ */

/* ==========================================
   BREADCRUMB
   ========================================== */

.breadcrumb {
  background-color: var(--color-bg-body);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.breadcrumb__list a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb__list a:hover {
  color: var(--color-primary);
}

.breadcrumb__list li + li::before {
  content: '→';
  margin-right: var(--space-2);
  color: var(--color-accent-warm);
}

/* ==========================================
   HERO DEL BLOG — Estilo documento técnico
   ========================================== */

.blog-hero {
  background-color: var(--color-bg-section);
  color: var(--color-text-body);
  padding: var(--space-10) 0;
  position: relative;
  overflow: hidden;
}

/* Imagen de fondo: biblioteca — desaturada, opaca, metálica */
.blog-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('../../assets/images/blog/library.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.25;
  filter: grayscale(100%) contrast(1.2) brightness(0.8);
  pointer-events: none;
}

/* Tinte metálico frío sobre la imagen */
.blog-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(40, 58, 136, 0.06) 0%,
    transparent 50%,
    rgba(40, 58, 136, 0.04) 100%
  );
  pointer-events: none;
}

.blog-hero .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: relative;
  z-index: 1;
}

/* Label tipo código de referencia */
.blog-hero__label {
  display: inline-block;
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent-warm);
  width: fit-content;
  padding: 0;
  border: none;
}

.blog-hero__title {
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  max-width: 640px;
}

/* Línea divisora naranja */
.blog-hero__rule {
  width: 100%;
  max-width: 640px;
  height: 2px;
  background-color: var(--color-accent-warm);
}

.blog-hero__subtitle {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  max-width: 560px;
}

/* Stats con monospace */
.blog-hero__stats {
  display: flex;
  gap: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.blog-hero__stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.blog-hero__stat-number {
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-warm);
  line-height: 1;
}

.blog-hero__stat-label {
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .blog-hero .container {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .blog-hero__stats {
    border-top: none;
    border-left: 1px solid var(--color-border);
    padding-top: 0;
    padding-left: var(--space-6);
    flex-direction: column;
    flex-shrink: 0;
  }

  .blog-hero {
    padding: var(--space-12) 0;
  }
}

/* ==========================================
   FILTROS DE CATEGORÍA — Tabs tipo índice
   ========================================== */

.blog-filters {
  background-color: var(--color-navy-700);
  padding: var(--space-5) 0;
  border-bottom: 3px solid var(--color-accent-warm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

body.has-sticky-header .blog-filters {
  top: var(--nav-height);
}

.blog-filters__bar {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--space-1);
}

.blog-filters__bar::-webkit-scrollbar {
  display: none;
}

.blog-filters__bar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.blog-filter {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: rgba(255, 255, 255, 0.5);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  min-height: 44px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: all var(--transition-fast);
}

.blog-filter:hover {
  color: var(--color-text-inverse);
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  border-bottom-color: rgba(255, 255, 255, 0.3);
}

.blog-filter[aria-selected="true"] {
  color: var(--color-accent-warm);
  background-color: rgba(232, 98, 10, 0.1);
  border-color: rgba(232, 98, 10, 0.3);
  border-bottom-color: var(--color-accent-warm);
  font-weight: var(--font-weight-bold);
}

.blog-filter__dot {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.blog-filter__dot--procesos { background-color: var(--color-primary-light); }
.blog-filter__dot--consumibles { background-color: var(--color-accent-warm); }
.blog-filter__dot--equipos { background-color: var(--color-whatsapp); }
.blog-filter__dot--industria { background-color: rgba(255, 255, 255, 0.5); }

/* ==========================================
   BADGES DE CATEGORÍA
   ========================================== */

.category-badge {
  display: inline-block;
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-1) var(--space-3);
  color: var(--color-text-inverse);
  z-index: 1;
}

.category-badge--procesos { background-color: var(--color-primary); }
.category-badge--consumibles { background-color: var(--color-accent-warm); }
.category-badge--equipos { background-color: var(--color-whatsapp); }
.category-badge--industria { background-color: var(--color-text-muted); }

/* ==========================================
   ARTÍCULO DESTACADO — Ficha técnica principal
   ========================================== */

.blog-featured {
  padding: var(--space-8) 0;
  background-color: var(--color-bg-body);
}

.featured-card {
  display: grid;
  grid-template-columns: 1fr;
  background-color: var(--card-bg);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  border-top: 3px solid var(--color-accent-warm);
}

.featured-card__image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--color-bg-section-dark);
}

.featured-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-card__body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-3);
}

.featured-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.featured-card__meta time {
  font-weight: var(--font-weight-semibold);
}

.featured-card__author {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.featured-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

.featured-card__title a {
  transition: color var(--transition-fast);
}

.featured-card__title a:hover {
  color: var(--color-primary);
}

.featured-card__excerpt {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

.featured-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-warm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: var(--space-2);
  transition: gap var(--transition-base);
}

.featured-card__link:hover {
  gap: var(--space-3);
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .featured-card {
    grid-template-columns: 1fr 1fr;
  }

  .featured-card__image {
    aspect-ratio: auto;
    min-height: 360px;
  }

  .featured-card__body {
    padding: var(--space-8);
  }

  .featured-card__title {
    font-size: var(--font-size-2xl);
  }

  .featured-card__excerpt {
    font-size: var(--font-size-base);
  }
}

/* ==========================================
   GRID DE ARTÍCULOS — Fichas técnicas
   ========================================== */

.blog-grid-section {
  padding: var(--space-8) 0 var(--space-10);
  background-color: var(--color-bg-body);
}

.blog-grid-section__title {
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent-warm);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

/* Post card — estilo ficha técnica */
.post-card {
  background-color: var(--card-bg);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
  border-left: 3px solid var(--color-primary);
}

.post-card:hover {
  box-shadow: var(--card-shadow-hover);
  border-left-color: var(--color-accent-warm);
}

.post-card[hidden] {
  display: none;
}

.post-card__image-link {
  display: block;
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--color-bg-section-dark);
}

.post-card__image-link img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.post-card:hover .post-card__image-link img {
  transform: scale(1.03);
}

.post-card__body {
  padding: var(--space-4);
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.post-card__meta time {
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-2);
}

.post-card__title a {
  transition: color var(--transition-fast);
}

.post-card__title a:hover {
  color: var(--color-primary);
}

.post-card__excerpt {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

@media (min-width: 768px) {
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mensaje vacío */
.blog-grid__empty {
  text-align: center;
  padding: var(--space-10) var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
}

.blog-grid__empty[hidden] {
  display: none;
}

/* ==========================================
   CTA DE SUSCRIPCIÓN — Boletín técnico
   ========================================== */

.blog-subscribe {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-10) 0;
  position: relative;
  overflow: hidden;
}

/* Textura cuadrícula técnica */
.blog-subscribe::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg, transparent, transparent 39px,
      rgba(255, 255, 255, 0.03) 39px,
      rgba(255, 255, 255, 0.03) 40px
    ),
    repeating-linear-gradient(
      90deg, transparent, transparent 39px,
      rgba(255, 255, 255, 0.02) 39px,
      rgba(255, 255, 255, 0.02) 40px
    );
  pointer-events: none;
}

.blog-subscribe__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.blog-subscribe__title {
  font-size: clamp(var(--font-size-xl), 3vw, var(--font-size-3xl));
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  line-height: var(--line-height-tight);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.blog-subscribe__text {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.75);
  max-width: 480px;
  line-height: var(--line-height-relaxed);
}

.blog-subscribe__row {
  display: flex;
  max-width: 480px;
}

.blog-subscribe__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-text-inverse);
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-sm);
}

.blog-subscribe__input::placeholder {
  color: rgba(255, 255, 255, 0.45);
  font-family: 'Courier New', Courier, monospace;
}

.blog-subscribe__input:focus {
  outline: none;
  border-color: var(--color-accent-warm);
}

@media (min-width: 768px) {
  .blog-subscribe__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ==========================================
   TARJETAS DE CATEGORÍA — Índice temático
   ========================================== */

.blog-categories {
  background-color: var(--color-bg-section);
  padding: var(--space-10) 0 var(--space-12);
}

.blog-categories__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.category-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  background-color: var(--card-bg);
  border-left: 3px solid var(--color-primary);
  box-shadow: var(--card-shadow);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
  cursor: pointer;
}

.category-card:hover {
  box-shadow: var(--card-shadow-hover);
  border-color: var(--color-accent-warm);
}

.category-card__icon {
  color: var(--color-primary);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-primary);
}

.category-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-body);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.category-card__desc {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

.category-card__count {
  font-family: 'Courier New', Courier, monospace;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-warm);
}

@media (min-width: 768px) {
  .blog-categories__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1025px) {
  .blog-categories__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ==========================================
   NAV LINK ACTIVO
   ========================================== */

.header__menu-link--active {
  color: var(--color-primary);
}

.header__menu-link--active::after {
  width: 100%;
  left: 0;
}