/* Blog ComparaFactura · 2026-08-28 */
:root{--bg:#f8fafc;--card:#fff;--ink:#0f172a;--muted:#475569;--line:#e2e8f0;--indigo:#4f46e5;--indigo2:#4338ca;--soft:#eef2ff;--green:#047857;--greenbg:#ecfdf5;--amber:#92400e;--amberbg:#fffbeb;--max:1160px;--article:820px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.68;-webkit-font-smoothing:antialiased}a{color:var(--indigo);text-decoration-thickness:.08em;text-underline-offset:.18em}a:hover{color:var(--indigo2)}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:12px;z-index:100;background:#fff;padding:10px 14px;border-radius:10px}.blog-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.blog-head-inner{max-width:var(--max);margin:auto;padding:0 22px;height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}.blog-brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:850;letter-spacing:-.02em}.brand-mark{width:38px;height:38px;border-radius:12px;background:var(--indigo);display:grid;place-items:center;color:#fff;font-weight:900;box-shadow:0 8px 24px rgba(79,70,229,.18)}.blog-brand small{display:block;color:#64748b;font-size:11px;font-weight:650;letter-spacing:.08em;text-transform:uppercase}.blog-nav{display:flex;align-items:center;gap:22px;font-size:14px;font-weight:650}.blog-nav a{color:#475569;text-decoration:none}.blog-nav a:hover,.blog-nav a[aria-current="page"]{color:var(--indigo)}.blog-nav .cta{background:var(--indigo);color:#fff!important;padding:9px 14px;border-radius:999px}.blog-wrap{max-width:var(--max);margin:auto;padding:42px 22px 70px}.breadcrumbs{font-size:13px;color:#64748b;margin-bottom:18px}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:0}.breadcrumbs li+li:before{content:"/";margin-right:6px;color:#94a3b8}.breadcrumbs a{color:#64748b}.hub-hero{padding:28px 0 34px;max-width:850px}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--indigo);background:var(--soft);border:1px solid #c7d2fe;border-radius:999px;padding:6px 11px;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.hub-hero h1,.article-hero h1{font-size:clamp(2.25rem,6vw,4.5rem);line-height:1.02;letter-spacing:-.055em;margin:17px 0 18px;max-width:920px}.hub-hero p,.article-deck{font-size:clamp(1.05rem,2vw,1.3rem);color:var(--muted);max-width:790px}.hub-intro{display:grid;grid-template-columns:2fr 1fr;gap:22px;margin-bottom:28px}.promise,.side-note{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 10px 30px rgba(15,23,42,.035)}.promise h2,.side-note h2{margin:0 0 10px;font-size:18px}.promise p,.side-note p{margin:0;color:var(--muted)}.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.post-card{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;display:flex;flex-direction:column;min-height:100%;box-shadow:0 12px 34px rgba(15,23,42,.04);transition:transform .18s ease,box-shadow .18s ease}.post-card:hover{transform:translateY(-2px);box-shadow:0 18px 42px rgba(15,23,42,.075)}.post-card-top{height:10px;background:linear-gradient(90deg,var(--indigo),#818cf8)}.post-card-body{padding:25px;display:flex;flex-direction:column;flex:1}.post-meta{font-size:12px;color:#64748b;font-weight:700;letter-spacing:.035em;text-transform:uppercase}.post-card h2{font-size:clamp(1.45rem,3vw,2rem);line-height:1.18;letter-spacing:-.035em;margin:10px 0 12px}.post-card h2 a{color:var(--ink);text-decoration:none}.post-card p{color:var(--muted);margin:0 0 18px}.post-tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:auto}.tag{font-size:12px;background:#f1f5f9;color:#475569;padding:5px 9px;border-radius:999px}.read{display:inline-block;margin-top:18px;font-weight:800}.article-shell{max-width:var(--article);margin:0 auto}.article-hero{padding:26px 0 28px}.article-hero h1{font-size:clamp(2.2rem,6vw,3.85rem)}.article-meta{display:flex;gap:9px;flex-wrap:wrap;color:#64748b;font-size:13px;margin-top:18px}.article-meta span{display:inline-flex;align-items:center;gap:4px}.article-meta span+span:before{content:"·";margin-right:9px}.answer-box{background:var(--greenbg);border:1px solid #a7f3d0;border-radius:18px;padding:20px 22px;margin:6px 0 30px}.answer-box strong{display:block;color:var(--green);font-size:12px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px}.answer-box p{margin:0;color:#064e3b;font-size:1.05rem}.article-body{font-size:17px}.article-body h2{font-size:clamp(1.55rem,3vw,2.05rem);line-height:1.22;letter-spacing:-.035em;margin:46px 0 13px}.article-body h3{font-size:1.2rem;line-height:1.3;margin:30px 0 10px}.article-body p{margin:0 0 18px;color:#1e293b}.article-body ul,.article-body ol{padding-left:24px;margin:0 0 22px}.article-body li{margin:8px 0;color:#1e293b}.article-body blockquote{margin:24px 0;padding:16px 20px;background:#fff;border-left:4px solid var(--indigo);border-radius:0 14px 14px 0;color:#334155}.fact-note{background:var(--amberbg);border:1px solid #fde68a;border-radius:16px;padding:18px 20px;margin:24px 0}.fact-note strong{color:var(--amber)}.toc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px 22px;margin:0 0 30px}.toc strong{display:block;margin-bottom:8px}.toc ol{margin:0;padding-left:20px}.toc li{margin:5px 0}.toc a{color:#334155}.table-wrap{overflow-x:auto;margin:22px 0 28px;border:1px solid var(--line);border-radius:16px;background:#fff}.article-table{border-collapse:collapse;width:100%;min-width:640px;font-size:15px}.article-table th,.article-table td{padding:13px 15px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.article-table th{background:#f8fafc;font-size:13px;color:#475569}.article-table tr:last-child td{border-bottom:0}.formula{background:#0f172a;color:#e2e8f0;border-radius:16px;padding:18px 20px;margin:24px 0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px;overflow:auto}.checklist{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px 22px}.checklist h2{margin-top:0}.faq{margin-top:42px}.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 17px;margin:10px 0}.faq summary{cursor:pointer;font-weight:800;padding:15px 0}.faq p{padding:0 0 15px;margin:0;color:#475569}.sources{margin-top:46px;border-top:1px solid var(--line);padding-top:26px}.sources h2{margin-top:0}.sources li{font-size:14px;color:#475569}.sources a{overflow-wrap:anywhere}.editorial{margin-top:28px;background:#f1f5f9;border-radius:16px;padding:18px 20px;font-size:14px;color:#475569}.related{margin-top:46px}.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.related a{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;text-decoration:none;font-weight:750;color:#1e293b}.related a span{display:block;color:#64748b;font-weight:500;font-size:13px;margin-top:5px}.blog-footer{border-top:1px solid var(--line);background:#fff}.footer-inner{max-width:var(--max);margin:auto;padding:32px 22px 40px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;font-size:14px;color:#64748b}.footer-inner strong{color:#1e293b}.footer-inner ul{list-style:none;padding:0;margin:8px 0 0}.footer-inner li{margin:5px 0}.footer-inner a{color:#475569}.footer-note{grid-column:1/-1;border-top:1px solid var(--line);padding-top:18px;font-size:12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:760px){.blog-head-inner{height:64px;padding:0 16px}.blog-brand small{display:none}.blog-nav{gap:12px}.blog-nav a:not(.cta){display:none}.blog-wrap{padding:28px 16px 52px}.hub-intro,.article-grid,.related-grid,.footer-inner{grid-template-columns:1fr}.hub-hero{padding-top:12px}.hub-hero h1,.article-hero h1{letter-spacing:-.045em}.post-card-body{padding:21px}.article-body{font-size:16px}.footer-note{grid-column:1}.article-meta span+span:before{content:"";margin:0}.article-meta span{width:100%}}

/* Header branding sync · 2026-08-28
   Reuse the exact ComparaFactura.es logo already served by the main site. */
.blog-brand{
  display:block;
  flex:0 0 auto;
  width:218px;
  height:58px;
  background:url('/logo.png') left center/contain no-repeat;
  text-decoration:none;
}
.blog-brand>span{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
@media(max-width:760px){
  .blog-brand{width:164px;height:52px}
  .blog-head-inner{gap:10px}
}