:root{
  --bg:#ffffff;
  --bg-soft:#fafafa;
  --cyan:#00d4ff;
  --black:#0a0a0a;
  --text:#1a1a1a;
  --muted:#555555;
  --line:#e5e5e5;
  --title:'Barlow Condensed',sans-serif;
  --body:'IBM Plex Sans',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-font-smoothing:antialiased}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--body);
  line-height:1.6;
  position:relative;
}

/* MATRIZ / GRID DE FONDO — sutil, azulado, animado */
.bg-grid{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(0,150,200,.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,150,200,.16) 1px, transparent 1px);
  background-size:48px 48px;
  animation:gridDrift 28s linear infinite;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 90%);
          mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 90%);
}
@keyframes gridDrift{
  0%{background-position:0 0,0 0}
  100%{background-position:48px 48px,48px 48px}
}
/* Resplandor cian que respira muy suave */
.bg-glow{
  position:fixed;top:-20%;left:50%;transform:translateX(-50%);
  width:90vw;max-width:1100px;height:600px;z-index:-1;pointer-events:none;
  background:radial-gradient(ellipse at center, rgba(0,212,255,.10), transparent 65%);
  animation:glowPulse 9s ease-in-out infinite;
}
@keyframes glowPulse{
  0%,100%{opacity:.55;transform:translateX(-50%) scale(1)}
  50%{opacity:1;transform:translateX(-50%) scale(1.08)}
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* HEADER */
.site-header{border-bottom:1px solid var(--line);padding:28px 0 24px}
.back-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;color:var(--muted);letter-spacing:.04em;
  text-transform:uppercase;margin-bottom:28px;transition:color .15s;
}
.back-link:hover{color:var(--cyan)}
.brand{display:flex;align-items:center;gap:14px}
.brand-logo{width:46px;height:46px;flex-shrink:0;display:block}
.brand-text{
  font-family:var(--title);font-weight:800;font-size:42px;
  letter-spacing:.01em;color:var(--black);line-height:.9;
}
.brand .tech{font-weight:700;color:var(--muted);margin-left:.4em}
.tagline{margin-top:10px;font-weight:400;color:var(--muted);font-size:15px;letter-spacing:.02em}

/* ENTRADA SUAVE DEL HEADER */
.back-link,.brand,.tagline{opacity:0;animation:introUp .6s ease forwards}
.brand{animation-delay:.08s}
.tagline{animation-delay:.16s}
@keyframes introUp{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
.brand-logo{animation:logoFloat 6s ease-in-out infinite}
@keyframes logoFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}

/* FILTERS */
.toolbar{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:16px;padding:26px 0;border-bottom:1px solid var(--line);
}
.filters{display:flex;flex-wrap:wrap;gap:22px}
.filter{
  background:none;border:none;cursor:pointer;font-family:var(--title);
  font-weight:700;font-size:18px;letter-spacing:.04em;text-transform:uppercase;
  color:var(--muted);padding:0 0 6px;position:relative;transition:color .15s;
}
.filter::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;
  background:var(--cyan);transition:width .2s;
}
.filter:hover{color:var(--text)}
.filter.active{color:var(--black)}
.filter.active::after{width:100%}
.count{font-size:13px;color:var(--muted);letter-spacing:.03em}

/* SHARED */
.cat-label{
  font-family:var(--title);font-weight:700;font-size:13px;
  letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);
}
.meta-date{font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
.author{display:flex;align-items:center;gap:12px}
.avatar{width:40px;height:40px;flex-shrink:0;border-radius:50%;object-fit:cover;display:block}
.author-name{font-weight:500;font-size:14px;color:var(--text);line-height:1.3}
.author-role{font-size:12px;color:var(--muted);line-height:1.3}

/* HERO */
.hero{padding:48px 0 8px;border-bottom:1px solid var(--line)}
.hero-top{display:flex;align-items:center;gap:18px;margin-bottom:18px}
.hero-rule{height:2px;background:var(--cyan);width:64px;margin:18px 0 26px}
.hero-title{
  font-family:var(--title);font-weight:800;font-size:48px;line-height:1.02;
  color:var(--black);letter-spacing:.005em;max-width:14ch;margin-bottom:18px;
}
.hero-excerpt{font-size:18px;color:var(--muted);max-width:60ch;margin-bottom:28px}
.hero-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:20px;padding-bottom:38px}
.read-btn{
  display:inline-flex;align-items:center;gap:10px;font-family:var(--title);
  font-weight:700;font-size:16px;letter-spacing:.06em;text-transform:uppercase;
  border:2px solid var(--black);padding:12px 24px;color:var(--black);
  transition:background .2s,color .2s;
}
.read-btn:hover{background:var(--black);color:#fff}

/* GRID */
.grid{
  display:grid;grid-template-columns:1fr 1fr;gap:0;
  border-top:1px solid var(--line);margin-top:0;
}
.card{
  position:relative;padding:36px 32px;border-bottom:1px solid var(--line);
  border-left:2px solid transparent;transition:border-color .2s;display:flex;flex-direction:column;
}
.card:nth-child(odd){border-right:1px solid var(--line)}
.card:hover{border-left-color:var(--cyan)}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:20px}
.card-title{
  font-family:var(--title);font-weight:700;font-size:27px;line-height:1.08;
  color:var(--black);margin-bottom:14px;transition:color .2s;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card:hover .card-title{color:var(--cyan)}
.card-excerpt{
  font-size:15px;color:var(--muted);margin-bottom:26px;flex:1;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.card-foot{display:flex;align-items:flex-end;justify-content:space-between;gap:14px}
.read-time{font-size:12px;color:var(--muted);letter-spacing:.04em;white-space:nowrap}

/* ANIMATION */
.reveal{opacity:0;transform:translateY(12px);animation:fadeUp .45s ease forwards}
@keyframes fadeUp{to{opacity:1;transform:none}}

/* SKELETON */
.sk{background:linear-gradient(90deg,#f0f0f0 25%,#e8e8e8 50%,#f0f0f0 75%);
  background-size:200% 100%;animation:pulse 1.3s ease-in-out infinite;border-radius:0}
@keyframes pulse{0%{background-position:200% 0}100%{background-position:-200% 0}}
.sk-block{height:14px;margin:10px 0}
.sk-card{padding:36px 32px;border-bottom:1px solid var(--line)}

/* EMPTY */
.empty{padding:80px 24px;text-align:center}
.empty h3{font-family:var(--title);font-weight:800;font-size:30px;color:var(--black);margin-bottom:12px}
.empty p{color:var(--muted)}

/* ===== PÁGINA DE ARTÍCULO ===== */
.article{max-width:740px;margin:0 auto;padding:0 24px}
.article-top{padding:48px 0 0}
.article-meta{display:flex;align-items:center;gap:18px;margin-bottom:18px}
.article-title{
  font-family:var(--title);font-weight:800;font-size:46px;line-height:1.03;
  color:var(--black);letter-spacing:.005em;margin-bottom:20px;
}
.article-excerpt{font-size:19px;color:var(--muted);margin-bottom:28px;line-height:1.5}
.article-rule{height:2px;background:var(--cyan);width:64px;margin:0 0 24px}
.article-author{display:flex;align-items:center;gap:14px;padding-bottom:34px;border-bottom:1px solid var(--line)}
.article-author .avatar{width:52px;height:52px}
.article-author .author-name{font-size:16px}
.article-author .read-time{margin-left:auto}

/* Cuerpo del artículo */
.article-body{padding:40px 0 10px;font-size:18px;line-height:1.75;color:var(--text)}
.article-body p{margin:0 0 24px}
.article-body h2{
  font-family:var(--title);font-weight:800;font-size:30px;line-height:1.1;
  color:var(--black);margin:42px 0 16px;letter-spacing:.01em;
}
.article-body ul{margin:0 0 26px;padding-left:0;list-style:none}
.article-body li{position:relative;padding-left:26px;margin-bottom:12px}
.article-body li::before{
  content:"";position:absolute;left:0;top:.65em;width:10px;height:2px;background:var(--cyan);
}
.article-body blockquote{
  margin:34px 0;padding:6px 0 6px 26px;border-left:3px solid var(--cyan);
  font-family:var(--title);font-weight:700;font-size:25px;line-height:1.25;
  color:var(--black);letter-spacing:.01em;
}

/* Pie del artículo */
.article-foot{padding:36px 0 10px;border-top:1px solid var(--line);margin-top:30px}

/* Estado de error */
.article-error{padding:90px 24px;text-align:center;max-width:560px;margin:0 auto}
.article-error h3{font-family:var(--title);font-weight:800;font-size:32px;color:var(--black);margin-bottom:12px}
.article-error p{color:var(--muted);margin-bottom:26px}

@media(max-width:768px){
  .article-title{font-size:34px}
  .article-excerpt{font-size:17px}
  .article-body{font-size:17px}
  .article-body h2{font-size:25px}
  .article-body blockquote{font-size:21px}
}

/* FOOTER */
.site-footer{border-top:1px solid var(--line);margin-top:60px;padding:32px 0;text-align:center}
.site-footer p{font-size:13px;color:var(--muted);letter-spacing:.04em}

/* Accesibilidad: desactiva animaciones si el usuario lo prefiere */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.back-link,.brand,.tagline{opacity:1!important;transform:none!important}
}

@media(max-width:768px){
  .brand-text{font-size:34px}
  .brand-logo{width:38px;height:38px}
  .hero{padding:34px 0 8px}
  .hero-title{font-size:34px;max-width:none}
  .hero-excerpt{font-size:16px}
  .grid{grid-template-columns:1fr}
  .card{padding:30px 4px}
  .card:nth-child(odd){border-right:none}
  .card-title{font-size:24px}
}