/* ══════════════════════════════════════════════════════════════
   qea — Hoja de estilo compartida para páginas pilar y blog.
   Un solo archivo: si cambias algo aquí, cambia en todas.
   La home (index.html) mantiene su CSS propio inline a propósito,
   porque es la página crítica de LCP.
   ══════════════════════════════════════════════════════════════ */

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

:root{
  --bg:#f5f6f8;--card:#fff;--border:rgba(0,0,0,.07);
  --text:#1a1a2e;--muted:#6b7280;--primary:#1c1c3a;
  --accent:#3b82f6;--green:#10b981;--amber:#f59e0b;
  --purple:#8b5cf6;--rose:#e11d48;
  --wrap:720px;
}

html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto}
a{color:var(--accent)}

/* ── NAV ───────────────────────────────────────── */
nav{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 48px;
  background:rgba(245,246,248,.92);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
}
.nav-logo{display:flex;align-items:center;text-decoration:none;flex-shrink:0}
.nav-logo img{height:22px;display:block}
.nav-cta{
  background:var(--primary);color:#fff;padding:9px 22px;border-radius:8px;
  font-size:.83rem;font-weight:600;text-decoration:none;transition:background .2s;
}
.nav-cta:hover{background:#2d2d6b}
@media(max-width:600px){
  nav{padding:12px 20px}
  .nav-cta{padding:8px 16px;font-size:.78rem}
}

/* ── BREADCRUMBS ───────────────────────────────── */
.crumbs{
  max-width:var(--wrap);margin:0 auto;padding:24px 24px 0;
  font-size:.78rem;color:var(--muted);
}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:7px;align-items:center}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--text);text-decoration:underline}
.crumbs li:not(:last-child)::after{content:"›";margin-left:7px;opacity:.5}
.crumbs [aria-current]{color:var(--text);font-weight:500}

/* ── CABECERA DE PÁGINA ────────────────────────── */
.page-head{max-width:var(--wrap);margin:0 auto;padding:28px 24px 0}
.eyebrow{
  display:inline-block;
  font-size:.7rem;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--accent);background:rgba(59,130,246,.08);
  padding:4px 12px;border-radius:20px;margin-bottom:18px;
}
.page-head h1{
  font-size:clamp(1.85rem,4.4vw,2.85rem);font-weight:900;
  letter-spacing:-1.4px;line-height:1.1;color:var(--primary);
  text-wrap:balance;
}
.standfirst{
  font-size:1.12rem;color:var(--muted);margin-top:16px;max-width:62ch;
}
.page-meta{
  display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;
  margin-top:22px;padding-top:18px;border-top:1px solid var(--border);
  font-size:.78rem;color:var(--muted);
}

/* ── CUERPO ────────────────────────────────────── */
.prose{max-width:var(--wrap);margin:0 auto;padding:0 24px 24px}
.prose h2{
  font-size:1.5rem;font-weight:800;letter-spacing:-.6px;color:var(--primary);
  margin:44px 0 14px;line-height:1.25;scroll-margin-top:80px;text-wrap:balance;
}
.prose h3{
  font-size:1.1rem;font-weight:700;letter-spacing:-.3px;color:var(--primary);
  margin:30px 0 10px;scroll-margin-top:80px;
}
.prose p{margin-bottom:18px;max-width:68ch}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px;max-width:68ch}
.prose li{margin-bottom:9px}
.prose strong{font-weight:650;color:var(--text)}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.prose a:hover{color:#2563eb}

/* ── ÍNDICE DE CONTENIDOS ──────────────────────── */
.toc{
  background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:20px 24px;margin:32px 0 8px;
}
.toc-title{
  font-size:.7rem;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--muted);margin-bottom:12px;
}
.toc ol{list-style:none;padding:0;margin:0;counter-reset:toc;max-width:none}
.toc li{margin-bottom:8px;counter-increment:toc;display:flex;gap:11px;font-size:.9rem}
.toc li::before{
  content:counter(toc,decimal-leading-zero);
  font-size:.7rem;font-weight:700;color:var(--accent);
  padding-top:3px;flex-shrink:0;font-variant-numeric:tabular-nums;
}
.toc a{color:var(--text);text-decoration:none}
.toc a:hover{color:var(--accent);text-decoration:underline}

/* ── DESTACADOS ────────────────────────────────── */
.callout{
  background:var(--card);border:1px solid var(--border);
  border-left:3px solid var(--accent);border-radius:10px;
  padding:18px 22px;margin:26px 0;
}
.callout.green{border-left-color:var(--green)}
.callout.amber{border-left-color:var(--amber)}
.callout p:last-child{margin-bottom:0}
.callout-label{
  font-size:.68rem;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--accent);margin-bottom:7px;
}
.callout.green .callout-label{color:var(--green)}
.callout.amber .callout-label{color:#b45309}

.formula{
  background:var(--primary);color:#fff;border-radius:12px;
  padding:26px 28px;margin:26px 0;text-align:center;
}
.formula-eq{
  font-size:clamp(.95rem,2.6vw,1.22rem);font-weight:700;letter-spacing:-.3px;
  line-height:1.5;
}
.formula-eq em{font-style:normal;color:#7aa8fb}
.formula-note{font-size:.8rem;color:rgba(255,255,255,.6);margin-top:12px}

/* ── TABLA ─────────────────────────────────────── */
.tw{overflow-x:auto;margin:24px 0;border:1px solid var(--border);border-radius:10px;background:var(--card)}
table{border-collapse:collapse;width:100%;min-width:440px;font-size:.88rem}
th{
  text-align:left;padding:12px 16px;background:#eef0f4;
  font-size:.68rem;font-weight:700;letter-spacing:.9px;text-transform:uppercase;
  color:var(--muted);border-bottom:1px solid var(--border);white-space:nowrap;
}
td{padding:12px 16px;border-bottom:1px solid var(--border);vertical-align:top}
tr:last-child td{border-bottom:none}
td.num{font-variant-numeric:tabular-nums;font-weight:700;color:var(--primary);white-space:nowrap}

/* ── FAQ ───────────────────────────────────────── */
.faq-item{
  background:var(--card);border:1px solid var(--border);border-radius:10px;
  margin-bottom:10px;overflow:hidden;
}
.faq-item summary{
  padding:16px 20px;font-weight:650;font-size:.94rem;color:var(--primary);
  cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:14px;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-weight:400;font-size:1.3rem;color:var(--muted);line-height:1;flex-shrink:0}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 20px 18px;font-size:.92rem;color:var(--muted);margin:0;max-width:none}

/* ── ENLACES RELACIONADOS ──────────────────────── */
.related{
  max-width:var(--wrap);margin:0 auto;padding:16px 24px 0;
}
.related-title{
  font-size:.7rem;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--muted);margin-bottom:14px;
}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.related-card{
  display:block;background:var(--card);border:1px solid var(--border);
  border-radius:12px;padding:18px 20px;text-decoration:none;transition:border-color .2s,transform .2s;
}
.related-card:hover{border-color:rgba(59,130,246,.4);transform:translateY(-2px)}
.related-card .rc-tag{
  font-size:.65rem;font-weight:700;letter-spacing:1px;text-transform:uppercase;
  color:var(--accent);margin-bottom:7px;display:block;
}
.related-card h3{font-size:.95rem;font-weight:700;color:var(--primary);letter-spacing:-.2px;line-height:1.35;margin:0}
.related-card p{font-size:.82rem;color:var(--muted);margin:7px 0 0;line-height:1.55}

/* ── CTA ───────────────────────────────────────── */
.cta-band{
  max-width:var(--wrap);margin:44px auto 0;padding:0 24px;
}
.cta-inner{
  background:linear-gradient(135deg,#2d2d6b,#1c1c3a);color:#fff;
  border-radius:16px;padding:34px 32px;text-align:center;
}
.cta-inner h2{font-size:1.35rem;font-weight:800;letter-spacing:-.5px;margin-bottom:10px;text-wrap:balance}
.cta-inner p{font-size:.92rem;color:rgba(255,255,255,.72);max-width:46ch;margin:0 auto 22px}
.cta-btn{
  display:inline-block;background:#fff;color:var(--primary);
  padding:13px 30px;border-radius:10px;font-size:.92rem;font-weight:700;
  text-decoration:none;transition:transform .2s;
}
.cta-btn:hover{transform:translateY(-2px)}
.cta-trust{
  display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center;
  margin-top:20px;font-size:.74rem;color:rgba(255,255,255,.55);
}

/* ── PREFOOTER (arquitectura de enlaces) ───────── */
.prefooter{background:linear-gradient(180deg,#2d2d6b,#1c1c3a);padding:56px 48px 36px;color:#fff;margin-top:64px}
.prefooter-cols{
  display:grid;grid-template-columns:repeat(4,1fr);gap:32px;
  max-width:880px;margin:0 auto;
}
.prefooter-col h4{
  font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.8px;
  color:rgba(255,255,255,.45);margin-bottom:14px;
}
.prefooter-col ul{list-style:none;display:flex;flex-direction:column;gap:10px;padding:0;margin:0}
.prefooter-col a{color:rgba(255,255,255,.75);text-decoration:none;font-size:.85rem;transition:color .2s}
.prefooter-col a:hover{color:#fff}
@media(max-width:760px){
  .prefooter{padding:48px 24px 30px}
  .prefooter-cols{grid-template-columns:1fr 1fr;gap:28px;max-width:420px}
}
@media(max-width:400px){.prefooter-cols{grid-template-columns:1fr;max-width:260px;text-align:center}}

footer{
  background:#fff;border-top:1px solid var(--border);padding:32px 48px;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;
}
.footer-logo img{height:20px;display:block}
footer p{font-size:.78rem;color:var(--muted)}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:var(--text)}
@media(max-width:600px){footer{padding:26px 24px;flex-direction:column;text-align:center}}

/* ── HUB DEL BLOG ──────────────────────────────── */
.hub-head{max-width:880px;margin:0 auto;padding:36px 24px 0;text-align:center}
.hub-head h1{
  font-size:clamp(1.9rem,4.6vw,2.9rem);font-weight:900;letter-spacing:-1.5px;
  color:var(--primary);line-height:1.1;
}
.hub-head .standfirst{margin:14px auto 0;text-align:center}
.hub-list{max-width:880px;margin:0 auto;padding:36px 24px 0;display:flex;flex-direction:column;gap:14px}
.hub-cluster{
  font-size:.7rem;font-weight:700;letter-spacing:1.3px;text-transform:uppercase;
  color:var(--muted);display:flex;align-items:center;gap:12px;margin-top:22px;
}
.hub-cluster:first-child{margin-top:0}
.hub-cluster::after{content:"";flex:1;height:1px;background:var(--border)}
.hub-card{
  display:block;background:var(--card);border:1px solid var(--border);
  border-radius:14px;padding:24px 26px;text-decoration:none;
  transition:border-color .2s,transform .2s,box-shadow .2s;
}
.hub-card:hover{border-color:rgba(59,130,246,.4);transform:translateY(-2px);box-shadow:0 10px 30px rgba(28,28,58,.07)}
.hub-card h2{font-size:1.15rem;font-weight:800;letter-spacing:-.4px;color:var(--primary);margin:0 0 8px;line-height:1.3}
.hub-card p{font-size:.9rem;color:var(--muted);margin:0;line-height:1.6;max-width:68ch}
.hub-card .hc-meta{
  display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;
  margin-top:14px;font-size:.74rem;color:var(--muted);
}
.hc-pill{
  background:rgba(59,130,246,.08);color:var(--accent);
  padding:3px 10px;border-radius:20px;font-weight:700;
  font-size:.68rem;letter-spacing:.4px;
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}