:root {
    --diamond-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><path d='M50 4 L96 50 L50 96 L4 50 Z' fill='white'/></svg>");

    --bg: #ffffff;
    --bg-2: #f4f5f7;
    --ink: #0b0d12;
    --ink-soft: #5a6072;
    --accent: #1ec8ff;
    --accent-2: #b794f4;
    --accent-3: #6ee7a8;
    --line: rgba(11,13,18,0.10);
    --card: #ffffff;
    --shadow-soft: 0 12px 40px rgba(11,13,18,.06), 0 2px 6px rgba(11,13,18,.04);
  }
  * { box-sizing: border-box; }
  html, body {
    margin: 0; padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Inter Tight", "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
  }
  body { overflow-x: hidden; }

  /* ========= Reading progress bar ========= */
  .reading-progress {
    position: fixed;
    top: 0; left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
    z-index: 100;
    transition: width .1s linear;
    border-radius: 0 2px 2px 0;
  }

  /* ========= Article header ========= */
  .article-header {
    padding: 140px 5vw 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
    max-width: 860px;
    margin: 0 auto;
  }
  .article-header::before {
    content: "";
    position: absolute; inset: 0;
    background:
      radial-gradient(ellipse 60% 50% at 30% 80%, rgba(30,200,255,.05), transparent),
      radial-gradient(ellipse 50% 40% at 70% 20%, rgba(183,148,244,.05), transparent);
    pointer-events: none;
  }
  .article-header .badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--accent);
    background: rgba(30,200,255,.08);
    padding: 5px 14px;
    border-radius: 999px;
    margin-bottom: 20px;
    position: relative;
  }
  .article-header .article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 14px;
    color: var(--ink-soft);
    margin-bottom: 24px;
    position: relative;
  }
  .article-header .article-meta .sep {
    width: 4px; height: 4px;
    background: var(--ink-soft);
    border-radius: 50%;
    opacity: .4;
  }
  .article-header h1 {
    font-family: "Inter Tight", sans-serif;
    font-weight: 900;
    font-size: clamp(28px, 4.5vw, 46px);
    letter-spacing: -.03em;
    line-height: 1.1;
    margin: 0 auto 24px;
    max-width: 780px;
    position: relative;
  }
  .article-header .lead {
    font-size: clamp(16px, 2.2vw, 19px);
    color: var(--ink-soft);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    font-weight: 500;
  }

  /* ========= Article body ========= */
  .article-body {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 5vw 60px;
    font-size: 18px;
    line-height: 1.7;
    color: var(--ink);
  }
  .article-body p {
    margin: 0 0 24px;
  }
  .article-body blockquote {
    margin: 32px 0;
    padding: 24px 28px;
    background: var(--bg-2);
    border-left: 3px solid var(--accent);
    border-radius: 0 12px 12px 0;
    font-style: italic;
    color: var(--ink);
    font-size: 17px;
    line-height: 1.65;
  }
  .article-body blockquote p {
    margin: 0;
  }
  .article-body h2 {
    font-family: "Inter Tight", sans-serif;
    font-weight: 800;
    font-size: clamp(22px, 3vw, 28px);
    letter-spacing: -.02em;
    line-height: 1.2;
    margin: 48px 0 20px;
    color: var(--ink);
  }
  .article-body strong {
    font-weight: 700;
    color: var(--ink);
  }
  .article-body ol {
    margin: 20px 0 28px;
    padding-left: 0;
    list-style: none;
    counter-reset: ol-counter;
  }
  .article-body ol li {
    counter-increment: ol-counter;
    position: relative;
    padding-left: 36px;
    margin-bottom: 16px;
    line-height: 1.65;
  }
  .article-body ol li::before {
    content: counter(ol-counter) ".";
    position: absolute;
    left: 0;
    font-weight: 800;
    color: var(--accent);
    font-size: 16px;
  }

  /* ========= Inline CTA ========= */
  .inline-cta {
    margin: 48px 0;
    padding: 36px 32px;
    background: linear-gradient(135deg,
      rgba(30,200,255,.05) 0%,
      rgba(183,148,244,.05) 50%,
      rgba(110,231,168,.05) 100%);
    border: 1px solid var(--line);
    border-radius: 20px;
    text-align: center;
  }
  .inline-cta p {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 20px;
    line-height: 1.4;
  }
  .inline-cta .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--ink);
    color: #fff;
    padding: 14px 28px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: transform .2s, box-shadow .2s;
  }
  .inline-cta .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(11,13,18,.15);
  }

  /* ========= Interlink card ========= */
  .interlink-card {
    display: flex;
    align-items: center;
    gap: 24px;
    margin: 48px 0;
    padding: 28px 32px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 20px;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-soft);
    transition: transform .25s, box-shadow .25s;
  }
  .interlink-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 48px rgba(11,13,18,.1), 0 4px 12px rgba(11,13,18,.06);
  }
  .interlink-card .il-icon {
    flex-shrink: 0;
    width: 56px; height: 56px;
    background: conic-gradient(from 200deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent));
    -webkit-mask-image: var(--diamond-mask);
            mask-image: var(--diamond-mask);
    -webkit-mask-size: 100% 100%;
            mask-size: 100% 100%;
    opacity: .35;
  }
  .interlink-card .il-content {
    flex: 1;
  }
  .interlink-card .il-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--accent);
    margin-bottom: 6px;
  }
  .interlink-card .il-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 4px;
  }
  .interlink-card .il-desc {
    font-size: 14px;
    color: var(--ink-soft);
    line-height: 1.5;
  }
  .interlink-card .il-arrow {
    flex-shrink: 0;
    font-size: 20px;
    opacity: .3;
    transition: opacity .2s, transform .2s;
  }
  .interlink-card:hover .il-arrow {
    opacity: .7;
    transform: translateX(4px);
  }
  @media (max-width: 560px) {
    .interlink-card {
      flex-direction: column;
      text-align: center;
      gap: 16px;
      padding: 24px 20px;
    }
    .interlink-card .il-arrow { display: none; }
  }

  /* ========= Related articles ========= */
  .related-section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 5vw 80px;
  }
  .related-section h2 {
    font-family: "Inter Tight", sans-serif;
    font-weight: 800;
    font-size: clamp(22px, 3vw, 30px);
    letter-spacing: -.02em;
    text-align: center;
    margin: 0 0 40px;
  }
  .related-section h2 em {
    font-family: "Playfair Display", serif;
    font-style: italic;
    font-weight: 400;
    color: var(--accent);
  }
  .related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 36px;
  }
  @media (max-width: 900px) {
    .related-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 560px) {
    .related-grid { grid-template-columns: 1fr; }
  }

  .card-blog {
    background: var(--card);
    border-radius: 16px;
    border: 1px solid var(--line);
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    transition: transform .25s, box-shadow .25s;
  }
  .card-blog:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-soft);
  }
  .card-blog .thumb {
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
  }
  .card-blog .thumb .diamond-bg {
    position: absolute;
    width: 120px; height: 120px;
    opacity: .12;
    background: conic-gradient(from 200deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent));
    -webkit-mask-image: var(--diamond-mask);
            mask-image: var(--diamond-mask);
    -webkit-mask-size: 100% 100%;
            mask-size: 100% 100%;
  }
  .card-blog .thumb .num-label {
    position: relative;
    font-family: "Playfair Display", serif;
    font-style: italic;
    font-weight: 500;
    font-size: 54px;
    color: rgba(11,13,18,.08);
    letter-spacing: -.04em;
  }
  .card-blog .body {
    padding: 20px 24px 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
  }
  .card-blog .card-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--accent);
    background: rgba(30,200,255,.08);
    padding: 4px 10px;
    border-radius: 999px;
    margin-bottom: 12px;
    align-self: flex-start;
  }
  .card-blog h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 10px;
    letter-spacing: -.01em;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .card-blog .excerpt {
    font-size: 14px;
    color: var(--ink-soft);
    line-height: 1.55;
    margin: 0 0 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .card-blog .meta {
    font-size: 12px;
    color: var(--ink-soft);
    opacity: .7;
    display: flex;
    gap: 16px;
    align-items: center;
  }

  /* ========= CTA final ========= */
  .cta-final {
    padding: 80px 5vw;
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  .cta-final::before {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(135deg,
      rgba(30,200,255,.04) 0%,
      rgba(183,148,244,.04) 50%,
      rgba(110,231,168,.04) 100%);
    pointer-events: none;
  }
  .cta-final .inner {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: var(--shadow-soft);
  }
  .cta-final h2 {
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 800;
    letter-spacing: -.02em;
    margin: 0 0 12px;
    line-height: 1.2;
  }
  .cta-final h2 em {
    font-family: "Playfair Display", serif;
    font-style: italic;
    font-weight: 400;
    color: var(--accent);
  }
  .cta-final p {
    font-size: 16px;
    color: var(--ink-soft);
    margin: 0 0 28px;
    line-height: 1.6;
  }
  .cta-final .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--ink);
    color: #fff;
    padding: 16px 32px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: transform .2s, box-shadow .2s;
  }
  .cta-final .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(11,13,18,.15);
  }
  .cta-final .btn .dur {
    opacity: .5;
    font-weight: 400;
  }

  /* ========= Footer ========= */
                              
  /* ========= Reveal animation ========= */
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .6s ease, transform .6s ease;
  }
  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Card stagger */
  .card-blog:nth-child(2) { transition-delay: .08s; }
  .card-blog:nth-child(3) { transition-delay: .16s; }

  /* ========= Article divider ========= */
  .article-divider {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 5vw;
  }
  .article-divider hr {
    border: none;
    height: 1px;
    background: var(--line);
    margin: 0;
  }

  /* ========= Back link ========= */
  .back-link {
    max-width: 700px;
    margin: 0 auto;
    padding: 32px 5vw 0;
  }
  .back-link a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-soft);
    text-decoration: none;
    transition: color .2s;
  }
  .back-link a:hover { color: var(--accent); }

  /* ============================================================== */
  /* ===== Phase 3 — Mobile GPU optimization (added 2026-05-08) ====== */
  /* Goal: 30-50% less GPU strain on mobile, no visual loss on desktop. */
  /* ============================================================== */
  @media (max-width: 768px) {
    /* Cap backdrop-filter blur radius — still glassy, half the GPU cost */
    nav.top {
      backdrop-filter: blur(8px) !important;
      -webkit-backdrop-filter: blur(8px) !important;
    }
    .nav-drawer {
      backdrop-filter: blur(12px) !important;
      -webkit-backdrop-filter: blur(12px) !important;
    }
    footer {
      backdrop-filter: blur(8px) saturate(140%) !important;
      -webkit-backdrop-filter: blur(8px) saturate(140%) !important;
    }
    .panel,
    .glass-card,
    .panel.glass .card,
    .panel.glass .stat-card,
    .sector,
    #sectores .panel.mesh,
    .journey-card,
    .process-row .step-card,
    .marquee-track .logo-pill,
    .video-slot .play,
    .btn.btn-revolucion {
      backdrop-filter: blur(10px) !important;
      -webkit-backdrop-filter: blur(10px) !important;
    }
    
    /* Disable purely decorative large blurs on pseudo-elements
       (orbs/halos that are >30px blur — cheaper to just hide than blur) */
    .panel.mesh::before,
    .panel.mesh::after {
      filter: blur(20px) !important;
      opacity: 0.6 !important;
    }
    
    /* Release GPU layers on elements that aren't actively animating.
       Keep will-change only on the 3D scene parts that DO animate continuously. */
    *:not(.scene):not(.octa):not(.face):not(.scene-shadow):not(.scene-glow) {
      will-change: auto !important;
    }
    
    /* Simplify multi-layer box-shadows on cards — one shadow is enough on mobile */
    .card-blog,
    .glass-card,
    .sprint-cta-card {
      transition-property: transform !important;
    }
  }
  
  /* On low-end devices that prefer reduced data, also disable scene completely */
  @media (max-width: 768px) and (prefers-reduced-data: reduce) {
    .scene { display: none !important; }
  }
  /* ============================================================== */

  /* ============================================================== */
  /* === Reveal animations DISABLED — content always visible ====== */
  /* ============================================================== */
  .reveal,
  .reveal.in,
  .reveal.visible {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  /* ============================================================== */


  /* ========= SprintIA brand mark (static, replaces removed 3D octaedro) ========= */
  .brand-mark {
    position: fixed;
    top: 50%;
    right: 5vw;
    width: 240px;
    height: 240px;
    transform: translateY(-50%);
    opacity: .055;
    pointer-events: none;
    z-index: 0;
    filter: drop-shadow(0 12px 40px rgba(30,200,255,.35));
  }
  .brand-mark img { width: 100%; height: 100%; display: block; }
  @media (max-width: 1100px) { .brand-mark { display: none; } }