/* ===========================================================================
   blog.css — Blog de Sapio (sapio.dev/blog)
   Dirección: editorial dark refinado, minimalismo a lo Apple. Fraunces display,
   Instrument Sans cuerpo, JetBrains Mono labels. Acento violeta usado con
   parquedad. Hairlines en vez de cajas pesadas. Mucho aire.
   =========================================================================== */

:root {
  --bg: #0a0a0a;
  --bg-soft: #100f14;
  --fg: #ffffff;
  --fg-dim: #e9e7ef;       /* cuerpo */
  --fg-mid: #b6b3c2;       /* deks */
  --fg-muted: #807d8c;     /* meta/labels */
  --accent: #b9a6ff;       /* violeta legible sobre negro */
  --accent-soft: #d6c9ff;
  --hair: rgba(255,255,255,0.09);
  --hair-strong: rgba(255,255,255,0.16);
  --card: #131218;
  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --nav-h: 80px;
  --maxw: 1080px;
  --prose: 680px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 24px); }
body {
  background: var(--bg);
  color: var(--fg-dim);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* atmósfera: glow violeta muy sutil arriba */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background: radial-gradient(120% 60% at 50% -10%, rgba(139,92,246,0.10), rgba(10,10,10,0) 55%);
}
a { color: var(--accent); text-decoration: none; transition: color .25s var(--ease); }
a:hover { color: var(--accent-soft); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 40px; position: relative; z-index: 1; }
.prose-wrap { max-width: var(--prose); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
.measure { max-width: var(--prose); }

/* ===== NAV (solo el header de nivel superior: body > nav) — réplica de la landing ===== */
body > nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50; padding: 24px 0;
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  background: rgba(9, 9, 11, 0.82);
  border-bottom: 1px solid var(--hair);
}
body > nav .nav-inner { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.logo {
  font-family: var(--serif); font-size: 26px; font-weight: 500;
  letter-spacing: -0.02em; font-style: italic; color: var(--fg);
}
.logo::after { content: '.'; color: var(--accent); }
.nav-links { display: flex; gap: 28px; align-items: center; font-size: 14px; }
.nav-links > a { color: var(--fg-mid); letter-spacing: 0.01em; }
.nav-links > a:hover { color: var(--fg); }

/* botones segmentados Iniciar sesión / Crear cuenta (idénticos a la landing) */
.nav-auth {
  display: inline-flex; align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 100px; overflow: hidden;
}
.nav-auth a {
  padding: 9px 18px; white-space: nowrap; color: #fff !important;
  font-size: 14px; transition: all 0.22s ease !important;
}
.nav-seg-login { background: transparent; }
.nav-seg-login:hover { background: rgba(255, 255, 255, 0.08); }
.nav-seg-signup { font-weight: 600; border-left: 1px solid rgba(255, 255, 255, 0.85); }
.nav-seg-signup:hover { background: var(--accent); color: #0a0a0a !important; }

/* ===== HERO del blog ===== */
.blog-hero { padding: calc(var(--nav-h) + 96px) 0 64px; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 26px;
}
.blog-hero h1 {
  font-family: var(--serif); font-weight: 300; color: var(--fg);
  font-size: clamp(42px, 6.4vw, 76px); line-height: 1.02; letter-spacing: -0.035em;
  max-width: 16ch;
}
.blog-hero p {
  margin-top: 26px; font-size: 20px; line-height: 1.55; color: var(--fg-mid); max-width: 52ch;
}

/* ===== ÍNDICE EDITORIAL (home) ===== */
.index { padding: 16px 0 100px; }

/* artículo destacado */
.lead {
  display: block; position: relative; border-top: 1px solid var(--hair-strong);
  padding: 44px 0 48px; margin-bottom: 8px;
}
.lead-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 22px;
}
.lead-title {
  font-family: var(--serif); font-weight: 300; color: var(--fg);
  font-size: clamp(32px, 4.6vw, 54px); line-height: 1.04; letter-spacing: -0.03em;
  max-width: 18ch; transition: color .25s var(--ease);
}
.lead:hover .lead-title { color: var(--accent-soft); }
.lead-dek { margin-top: 20px; font-size: 19px; line-height: 1.55; color: var(--fg-mid); max-width: 56ch; }
.lead-cta {
  display: inline-flex; align-items: center; gap: 10px; margin-top: 28px;
  font-size: 15px; font-weight: 500; color: var(--accent);
}
.lead-cta .arw { transition: transform .25s var(--ease); }
.lead:hover .lead-cta .arw { transform: translateX(6px); }

/* secciones */
.group { margin-top: 56px; }
.group-title {
  display: flex; align-items: baseline; gap: 16px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--fg-muted); font-weight: 500;
  padding-bottom: 8px;
}
.group-title .num { color: var(--accent); }

/* filas */
.entries { list-style: none; }
.entries li { border-top: 1px solid var(--hair); }
.entry {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 28px;
  padding: 26px 12px 26px 4px; transition: padding-left .3s var(--ease), background .3s var(--ease);
}
.entry:hover { padding-left: 20px; background: linear-gradient(90deg, rgba(185,166,255,0.05), rgba(185,166,255,0) 70%); }
.entry-main { min-width: 0; }
.entry-title {
  display: block; font-family: var(--serif); font-weight: 400; color: var(--fg);
  font-size: 25px; line-height: 1.18; letter-spacing: -0.018em;
  transition: color .25s var(--ease);
}
.entry:hover .entry-title { color: var(--accent-soft); }
.entry-dek { display: block; margin-top: 7px; font-size: 15.5px; color: var(--fg-mid); max-width: 62ch; }
.entry-side { display: flex; align-items: center; gap: 22px; white-space: nowrap; }
.entry-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--fg-muted);
}
.entry-arw {
  color: var(--fg-muted); font-size: 18px; opacity: 0; transform: translateX(-8px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), color .25s var(--ease);
}
.entry:hover .entry-arw { opacity: 1; transform: translateX(0); color: var(--accent); }

/* ===== ARTÍCULO ===== */
.article { padding: calc(var(--nav-h) + 56px) 0 40px; }
.breadcrumb {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  color: var(--fg-muted); margin-bottom: 30px;
}
.breadcrumb a { color: var(--fg-muted); }
.breadcrumb a:hover { color: var(--accent); }
.article-meta {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 22px;
}
.article h1 {
  font-family: var(--serif); font-weight: 300; color: var(--fg);
  font-size: clamp(36px, 5.2vw, 56px); line-height: 1.05; letter-spacing: -0.035em;
}
.article .standfirst {
  margin-top: 26px; font-size: 22px; line-height: 1.5; color: var(--fg-mid); font-weight: 400;
  border-left: 2px solid var(--accent); padding-left: 22px;
}
.article-body { margin-top: 48px; font-size: 18px; line-height: 1.72; color: var(--fg-dim); }
.article-body h2 {
  font-family: var(--serif); font-weight: 400; color: var(--fg);
  font-size: 31px; line-height: 1.16; letter-spacing: -0.022em;
  margin: 60px 0 18px; padding-top: 8px;
}
.article-body h3 {
  font-family: var(--sans); font-weight: 600; color: var(--fg);
  font-size: 20px; letter-spacing: -0.01em; margin: 36px 0 12px;
}
.article-body p { margin: 0 0 22px; }
.article-body ul, .article-body ol { margin: 0 0 24px; padding-left: 4px; list-style: none; }
.article-body ul li, .article-body ol li { position: relative; padding-left: 26px; margin-bottom: 12px; }
.article-body ul li::before {
  content: ""; position: absolute; left: 4px; top: 13px; width: 6px; height: 6px;
  border-radius: 50%; background: var(--accent);
}
.article-body ol { counter-reset: li; }
.article-body ol li { counter-increment: li; }
.article-body ol li::before {
  content: counter(li); position: absolute; left: 0; top: 1px;
  font-family: var(--mono); font-size: 13px; color: var(--accent); font-weight: 500;
}
.article-body strong { color: var(--fg); font-weight: 600; }
.article-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(185,166,255,0.35); padding-bottom: 1px; transition: border-color .2s var(--ease), color .2s var(--ease); }
.article-body a:hover { color: var(--accent-soft); border-color: var(--accent-soft); }
.article-body blockquote {
  margin: 34px 0; padding: 4px 0 4px 28px; border-left: 2px solid var(--hair-strong);
  font-family: var(--serif); font-style: italic; font-weight: 400;
  font-size: 23px; line-height: 1.45; color: var(--fg);
}

/* tablas — hairline, sin caja pesada */
.article-body table { width: 100%; border-collapse: collapse; margin: 30px 0; font-size: 16px; }
.article-body thead th {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--fg-muted); font-weight: 500; text-align: left;
  padding: 0 18px 12px; border-bottom: 1px solid var(--hair-strong); vertical-align: bottom;
}
.article-body tbody td {
  padding: 14px 18px; border-bottom: 1px solid var(--hair); vertical-align: top; color: var(--fg-dim);
}
.article-body tbody tr td:first-child { color: var(--fg); font-weight: 500; }

/* respuesta directa (AEO) — refinada */
.tldr {
  position: relative; background: var(--bg-soft); border: 1px solid var(--hair);
  border-radius: 18px; padding: 28px 30px; margin: 0 0 40px; overflow: hidden;
}
.tldr::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent); }
.tldr .tldr-label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px;
}
.tldr p { font-size: 19px; line-height: 1.55; color: var(--fg); margin: 0; }

/* FAQ */
.faq { margin-top: 64px; border-top: 1px solid var(--hair-strong); padding-top: 16px; }
.faq h2 { font-family: var(--serif); font-weight: 400; color: var(--fg); font-size: 30px; letter-spacing: -0.02em; margin: 28px 0 8px; }
.faq-item { border-bottom: 1px solid var(--hair); padding: 24px 0; }
.faq-item h3 { font-family: var(--sans); font-weight: 600; color: var(--fg); font-size: 18.5px; margin-bottom: 10px; letter-spacing: -0.01em; }
.faq-item p { font-size: 16.5px; line-height: 1.6; color: var(--fg-mid); margin: 0; }

/* CTA */
.cta-box {
  position: relative; margin: 64px 0 16px; padding: 48px 44px; text-align: center; overflow: hidden;
  background: var(--bg-soft); border: 1px solid var(--hair); border-radius: 24px;
}
.cta-box::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(80% 120% at 50% 0%, rgba(139,92,246,0.14), rgba(10,10,10,0) 60%);
}
.cta-box h2 { position: relative; font-family: var(--serif); font-weight: 400; color: var(--fg); font-size: 31px; letter-spacing: -0.025em; margin-bottom: 14px; }
.cta-box p { position: relative; color: var(--fg-mid); max-width: 46ch; margin: 0 auto 26px; }
.btn {
  position: relative; display: inline-block; background: var(--fg); color: #0a0a0a;
  padding: 14px 32px; border-radius: 999px; font-weight: 600; font-size: 15px;
  transition: transform .25s var(--ease), background .25s var(--ease);
}
.btn:hover { background: var(--accent-soft); color: #0a0a0a; transform: translateY(-2px); }
/* el botón no debe heredar el subrayado/color de los enlaces del cuerpo */
.article-body a.btn { color: #0a0a0a; border-bottom: none; padding: 14px 32px; }
.article-body a.btn:hover { color: #0a0a0a; border-bottom: none; }

/* relacionados */
.related { margin: 56px 0 0; border-top: 1px solid var(--hair); padding-top: 28px; }
.related .post-tag { font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--fg-muted); margin-bottom: 6px; display: block; }
.related-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 40px; }
.related-list a {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--hair); color: var(--fg-dim);
  font-family: var(--serif); font-size: 18px; font-weight: 400; transition: color .2s var(--ease);
}
.related-list a::after { content: "→"; color: var(--fg-muted); transition: transform .25s var(--ease), color .25s var(--ease); }
.related-list a:hover { color: var(--accent-soft); }
.related-list a:hover::after { transform: translateX(5px); color: var(--accent); }

/* ===== FOOTER ===== */
footer { border-top: 1px solid var(--hair); padding: 72px 0 48px; margin-top: 96px; position: relative; z-index: 1; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 64px; }
.footer-brand .logo { font-size: 30px; margin-bottom: 18px; display: inline-block; }
.footer-brand p { color: var(--fg-mid); font-size: 14px; max-width: 280px; line-height: 1.6; }
.footer-col h4 {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--fg-muted); margin-bottom: 20px; font-weight: 500;
}
.footer-col a { display: block; color: var(--fg-mid); font-size: 15px; margin-bottom: 13px; }
.footer-col a:hover { color: var(--fg); }
.footer-bottom {
  border-top: 1px solid var(--hair); padding-top: 32px;
  display: flex; justify-content: space-between; font-size: 12px;
  color: var(--fg-muted); font-family: var(--mono); letter-spacing: 0.04em;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 860px) {
  .container { padding: 0 24px; }
  .entry { grid-template-columns: 1fr; gap: 8px; }
  .entry-side { display: none; }
  .related-list { grid-template-columns: 1fr; gap: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 600px) {
  body { font-size: 17px; }
  .nav-links { gap: 14px; font-size: 13px; }
  .nav-links > a { display: none; }
  .article-body { font-size: 17px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}