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

    :root {
      --black: #000000;
      --dark-gray: #404040;
      --mid-gray: #808080;
      --light-gray: #D9D9D9;
      --off-white: #F5F5F5;
      --white: #FFFFFF;
      --red: #FF0000;
      --red-dark: #CC0000;
      --font: Calibri, Carlito, "Segoe UI", Arial, sans-serif;
      --max-w: 960px;
    }

    html { scroll-behavior: smooth; font-size: 16px; }
    body { font-family: var(--font); color: var(--black); background: var(--white); line-height: 1.6; -webkit-font-smoothing: antialiased; }
    img { max-width: 100%; display: block; }
    a { color: inherit; text-decoration: none; }
    ul { list-style: none; }
    p { margin-bottom: 1em; }

    h1, h2, h3, h4 { font-family: var(--font); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
    h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
    h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
    h3 { font-size: clamp(1.1rem, 2vw, 1.3rem); }

    .btn {
      display: inline-block;
      font-family: var(--font);
      font-size: 0.9rem;
      font-weight: 700;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      padding: 14px 28px;
      border: 2px solid transparent;
      cursor: pointer;
      transition: background 0.15s, color 0.15s, border-color 0.15s;
      white-space: nowrap;
    }
    .btn--primary { background: var(--red); color: var(--white); border-color: var(--red); }
    .btn--primary:hover { background: var(--red-dark); border-color: var(--red-dark); }
    .btn--secondary { background: transparent; color: var(--black); border-color: var(--black); }
    .btn--secondary:hover { background: var(--black); color: var(--white); }

    .site-header {
      position: sticky; top: 0; z-index: 100;
      background: var(--white);
      border-bottom: 1px solid var(--light-gray);
    }
    .site-header__inner {
      max-width: 1160px; margin: 0 auto; padding: 0 24px;
      height: 64px; display: flex; align-items: center;
      justify-content: space-between; gap: 24px;
    }
    .site-header__logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
    .site-header__logo-img { height: 32px; width: auto; }
    .site-header__logo-text { display: flex; flex-direction: column; line-height: 1.1; }
    .brand-itm { font-size: 0.65rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--mid-gray); }
    .brand-p2p { font-size: 1rem; font-weight: 700; color: var(--black); letter-spacing: -0.01em; }
    .brand-p2p span { color: var(--red); }

    .site-nav { display: flex; }
    .site-nav__list { display: flex; gap: 4px; list-style: none; }
    .site-nav__list a {
      display: block; padding: 8px 14px;
      font-size: 0.82rem; font-weight: 600;
      letter-spacing: 0.04em; text-transform: uppercase;
      color: var(--dark-gray);
      border-bottom: 2px solid transparent;
      transition: color 0.12s, border-color 0.12s;
    }
    .site-nav__list a:hover,
    .site-nav__list a[aria-current="page"] { color: var(--black); border-bottom-color: var(--red); }

    .lang-switcher {
      display: flex; align-items: center; gap: 2px; flex-shrink: 0;
      border: 1px solid rgba(0,0,0,0.15); border-radius: 4px;
      padding: 3px 4px; background: rgba(255,255,255,0.06);
    }
    .lang-switcher__item {
      display: flex; align-items: center; gap: 4px;
      padding: 3px 6px; border-radius: 3px;
      font-size: 0.68rem; font-weight: 700;
      letter-spacing: 0.06em; text-transform: uppercase;
      color: var(--dark-gray);
      transition: background 0.12s, color 0.12s;
    }
    .lang-switcher__item svg { width: 16px; height: 11px; display: block; border-radius: 1px; }
    .lang-switcher__item:hover { background: rgba(0,0,0,0.06); color: var(--black); }
    .lang-switcher__item.is-active { background: var(--black); color: var(--white); }
    .lang-switcher__sep { width: 1px; height: 14px; background: rgba(0,0,0,0.12); flex-shrink: 0; }

    .site-header__cta { flex-shrink: 0; }
    .nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; color: var(--black); }

    @media (max-width: 768px) {
      .site-nav, .site-header__cta, .lang-switcher { display: none; }
      .nav-toggle { display: flex; align-items: center; }
    }

    .page-header {
      background: var(--black); color: var(--white);
      padding: 64px 24px 56px;
    }
    .page-header__inner { max-width: var(--max-w); margin: 0 auto; }
    .breadcrumb { display: flex; align-items: center; gap: 6px; font-size: 0.75rem; color: #888; margin-bottom: 20px; }
    .breadcrumb a { color: #888; }
    .breadcrumb a:hover { color: var(--light-gray); }
    .breadcrumb__sep { color: #555; }
    .page-header h1 { color: var(--white); margin-bottom: 16px; }
    .page-header__desc { font-size: 1.05rem; color: var(--light-gray); max-width: 680px; }

    .blog-listing {
      padding: 64px 24px 80px;
      background: var(--off-white);
    }
    .blog-listing__inner { max-width: var(--max-w); margin: 0 auto; }

    .entry-card {
      background: var(--white);
      border: 1px solid var(--light-gray);
      padding: 30px;
      margin-bottom: 24px;
    }
    .entry-meta {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
      margin-bottom: 14px;
      font-size: 0.78rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--mid-gray);
      font-weight: 700;
    }
    .entry-title { margin-bottom: 14px; }
    .entry-title a { text-decoration: none; }
    .entry-title a:hover { text-decoration: underline; }
    .entry-excerpt { color: var(--dark-gray); margin-bottom: 22px; }

    .entry-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 22px;
    }
    .entry-tag {
      display: inline-block;
      border: 1px solid var(--light-gray);
      color: var(--dark-gray);
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      padding: 5px 8px;
      background: #fafafa;
    }
    /* --- Categorías de artículo --- */
    .entry-category {
      display: inline-block;
      font-size: 0.68rem;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      padding: 3px 8px;
      border-radius: 2px;
    }
    .entry-category--validacion        { background: #fff0f0; color: #b80000; border: 1px solid #f5c0c0; }
    .entry-category--materiales        { background: #e8f0fc; color: #1a3f7a; border: 1px solid #b8ceee; }
    .entry-category--industrializacion { background: #eef7ee; color: #1a5c20; border: 1px solid #b6d9b6; }

    .entry-cats { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }

    /* --- Filtro de blog --- */
    
    .entry-card__img-wrap {
      margin: -30px -30px 24px -30px;
      overflow: hidden;
      line-height: 0;
      background: var(--white);
      border-bottom: 1px solid var(--light-gray);
    }
    .entry-card__img {
      width: 100%;
      height: 220px;
      object-fit: contain;
      padding: 12px;
      background: var(--white);
      box-sizing: border-box;
      display: block;
      transition: transform 0.3s ease;
    }
    .entry-card__img--contain {
      object-fit: contain;
    }
    .entry-card__img--cover {
      object-fit: cover;
      padding: 0;
    }
    .entry-card:hover .entry-card__img { transform: scale(1.03); }
    .blog-filter {
      display: flex; gap: 8px; flex-wrap: wrap;
      margin-bottom: 32px; padding-bottom: 24px;
      border-bottom: 1px solid var(--light-gray);
    }
    .filter-btn {
      background: none;
      border: 1px solid var(--light-gray);
      color: var(--dark-gray);
      font-family: var(--font-stack, inherit);
      font-size: 0.78rem; font-weight: 700;
      letter-spacing: 0.05em; text-transform: uppercase;
      padding: 7px 16px; cursor: pointer;
      transition: background 0.12s, color 0.12s, border-color 0.12s;
    }
    .filter-btn:hover { background: #f0f0f0; color: var(--black, #000); }
    .filter-btn.is-active { background: var(--black, #000); color: #fff; border-color: var(--black, #000); }

    .blog-note {
      background: var(--white);
      border-left: 4px solid var(--red);
      padding: 22px;
      color: var(--dark-gray);
      font-size: 0.95rem;
    }

    .final-cta {
      background: var(--black);
      color: var(--white);
      padding: 80px 24px;
      text-align: center;
    }
    .final-cta__inner { max-width: 720px; margin: 0 auto; }
    .final-cta .section-label {
      display: block;
      font-size: 0.7rem;
      font-weight: 700;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--red);
      margin-bottom: 12px;
    }
    .final-cta h2 { color: var(--white); margin-bottom: 16px; }
    .final-cta p { font-size: 1.05rem; color: var(--light-gray); margin-bottom: 36px; }

    .site-footer { background: var(--dark-gray); color: var(--light-gray); padding: 56px 24px 32px; }
    .site-footer__inner { max-width: 1160px; margin: 0 auto; }
    .site-footer__grid {
      display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px; padding-bottom: 48px; border-bottom: 1px solid #555;
    }
    .footer-brand__logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
    .footer-brand__logo-mark {
      width: 32px; height: 32px; background: var(--white);
      display: flex; align-items: center; justify-content: center;
    }
    .footer-brand__logo-mark svg { width: 18px; height: 18px; stroke: var(--black); fill: none; stroke-width: 2; }
    .footer-brand__name { font-size: 1rem; font-weight: 700; color: var(--white); }
    .footer-brand__desc { font-size: 0.82rem; line-height: 1.6; color: #aaa; max-width: 280px; }
    .footer-col h4 { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--white); margin-bottom: 16px; }
    .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
    .footer-col ul li a { font-size: 0.82rem; color: #aaa; transition: color 0.12s; }
    .footer-col ul li a:hover { color: var(--white); }
    .footer-contact-item { display: flex; align-items: flex-start; gap: 10px; font-size: 0.82rem; color: #aaa; line-height: 1.4; margin-bottom: 10px; }
    .footer-contact-item svg { width: 14px; height: 14px; stroke: var(--mid-gray); fill: none; stroke-width: 2; flex-shrink: 0; margin-top: 2px; }
    .footer-contact-item a { color: #aaa; transition: color 0.12s; }
    .footer-contact-item a:hover { color: var(--white); }
    .site-footer__bottom { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 24px; font-size: 0.75rem; color: #777; flex-wrap: wrap; }
    .site-footer__bottom a { color: #777; transition: color 0.12s; }
    .site-footer__bottom a:hover { color: var(--light-gray); }

    @media (max-width: 900px) {
      .site-footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
      .footer-brand { grid-column: 1 / -1; }
    }
    @media (max-width: 500px) {
      .site-footer__grid { grid-template-columns: 1fr; }
    }