/* ═══════════════════════════════════════
   BLOG — Core'ai  ·  Linear-style light
   Hereda tokens de styles.css
═══════════════════════════════════════ */

/* ── Nav blog: estado "scrolled" permanente ────────────────────────────────
   Los estilos base del .hero-nav (flex, brand, links, cta) están todos bajo
   .hero-sierra .hero-nav en styles.css. En el blog no hay .hero-sierra, así
   que replicamos aquí el estado scrolled como estilo fijo.
─────────────────────────────────────────────────────────────────────────── */
.blog-page .hero-nav {
  /* layout base (= .hero-sierra .hero-nav) */
  display: flex;
  align-items: center;
  gap: 38px;
  font-family: var(--sans);

  /* position (= #main-nav + scrolled) */
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  z-index: 100;
  padding: 0 36px;
  height: 64px;

  /* apariencia scrolled */
  background: rgba(250, 250, 247, 0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(0,0,0,.07);
}

.blog-page .hero-nav .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -.01em;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}
.blog-page .hero-nav .brand svg {
  width: 22px;
  height: 22px;
  color: var(--indigo);  /* único morado de la página */
}
.blog-page .hero-nav .brand .ai {
  color: var(--indigo);
  opacity: .7;
}

.blog-page .hero-nav .links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13.5px;
  font-weight: 500;
}
.blog-page .hero-nav .links li a {
  color: var(--ink-3);
  text-decoration: none;
  transition: color .2s ease;
}
.blog-page .hero-nav .links li a:hover { color: var(--ink); }

.blog-page .hero-nav .nav-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.blog-page .hero-nav .hero-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,.12);
  background: rgba(0,0,0,.04);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background .2s ease;
}
.blog-page .hero-nav .hero-nav-cta svg {
  width: 14px;
  height: 14px;
  opacity: .7;
  transition: transform .2s ease;
}
.blog-page .hero-nav .hero-nav-cta:hover { background: rgba(0,0,0,.08); }
.blog-page .hero-nav .hero-nav-cta:hover svg { transform: translateX(3px); }

/* WhatsApp nav CTA: siempre visible en blog (no necesita scroll trigger) */
.blog-page .hero-nav .nav-wa-cta {
  opacity: 1;
  pointer-events: auto;
}

/* Móvil: igual que scrolled en la landing */
@media (max-width: 860px) {
  .blog-page .hero-nav { padding: 0 20px; }
  .blog-page .hero-nav .links { display: none; }
  .blog-page .hero-nav .hero-nav-cta { display: none; }
}

/* ── Reading progress bar ── */
.reading-progress {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 2px;
  background: var(--ink);
  z-index: 1000;
  transition: width .1s linear;
}

/* ════════════════════════════════════════
   BLOG INDEX
════════════════════════════════════════ */

.blog-index-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}

.blog-index-header {
  padding: 100px 0 72px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 64px;
}

.blog-index-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  display: block;
  margin-bottom: 20px;
}

.blog-index-h1 {
  font-family: var(--sans);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.035em;
  line-height: 1.05;
  margin: 0 0 16px;
}

.blog-index-sub {
  font-size: 18px;
  color: var(--ink-3);
  margin: 0;
  max-width: 500px;
  line-height: 1.6;
  font-weight: 400;
}

/* ── Cards grid: horizontal primero, se apilan cuando hay más ── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-bottom: 100px;
}

.blog-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s ease, border-color .2s ease;
}

/* ── Card cover image ── */
.blog-card-cover {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-warm);
}
.blog-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
}
.blog-card:hover .blog-card-cover img { transform: scale(1.02); }

.blog-card-body {
  padding: 24px 28px 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.blog-card:hover {
  box-shadow: 0 2px 2px rgba(21,20,27,.04), 0 16px 40px -12px rgba(21,20,27,.12);
  border-color: rgba(21,20,27,.12);
}

/* ── Article cover image (header of article page) ── */
.article-cover {
  max-width: 680px;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 48px;
}
.article-cover img {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.blog-card-tag {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 14px;
}

.blog-card-title {
  font-size: 20px;
  font-weight: 650;
  color: var(--ink);
  line-height: 1.3;
  letter-spacing: -.015em;
  margin: 0 0 12px;
  flex: 1;
}

.blog-card-excerpt {
  font-size: 14px;
  color: var(--ink-3);
  line-height: 1.6;
  margin: 0 0 20px;
}

.blog-card-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-4);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}
.blog-card-meta-sep { opacity: .4; }

.blog-card-arrow {
  margin-left: auto;
  color: var(--ink-3);
  opacity: 0;
  transition: opacity .18s ease, transform .18s ease;
}
.blog-card:hover .blog-card-arrow {
  opacity: 1;
  transform: translateX(3px);
}

@media (max-width: 700px) {
  .blog-index-wrap { padding: 0 20px; }
  .blog-grid { grid-template-columns: 1fr; gap: 14px; }
  .blog-index-header { padding: 80px 0 48px; }
}


/* ════════════════════════════════════════
   ARTICLE PAGE
════════════════════════════════════════ */

.article-page-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ── Article header ── */
.article-header {
  padding: 88px 0 64px;
  max-width: 760px;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-4);
  text-decoration: none;
  margin-bottom: 40px;
  transition: color .15s ease;
}
.article-back:hover { color: var(--ink); }
.article-back svg { transition: transform .15s ease; }
.article-back:hover svg { transform: translateX(-3px); }

.article-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  display: block;
  margin-bottom: 20px;
}

.article-h1 {
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.03em;
  line-height: 1.1;
  margin: 0 0 32px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-4);
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.article-meta-sep { opacity: .35; }

/* ── Article body column ── */
.article-content--full {
  max-width: 680px;
  padding: 8px 0 100px;
}

.article-body p {
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink-2);
  margin: 0 0 28px;
}

.article-body > p:first-child {
  font-size: 19px;
  color: var(--ink);
  font-weight: 450;
}

.article-body h2 {
  font-size: clamp(22px, 2.5vw, 26px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.02em;
  line-height: 1.2;
  margin: 72px 0 20px;
  padding-left: 18px;
  border-left: 3px solid var(--line);
}

.article-body h3 {
  font-size: 19px;
  font-weight: 650;
  color: var(--ink);
  letter-spacing: -.015em;
  line-height: 1.3;
  margin: 48px 0 14px;
}

.article-body ul,
.article-body ol {
  padding-left: 24px;
  margin: 4px 0 28px;
}
.article-body li {
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-2);
  margin-bottom: 10px;
}

.article-body strong { color: var(--ink); font-weight: 650; }
.article-body a { color: var(--ink); text-underline-offset: 3px; }

/* ── Stat callout ── */
.article-stat {
  background: var(--bg-warm);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-3);
  border-radius: 0 14px 14px 0;
  padding: 36px 40px;
  margin: 48px 0;
}

.article-stat-number {
  font-family: var(--mono);
  font-size: clamp(48px, 7vw, 72px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.04em;
  line-height: 1;
  display: block;
  margin-bottom: 10px;
}

.article-stat-label {
  font-size: 15px;
  color: var(--ink-3);
  line-height: 1.55;
  max-width: 480px;
}

/* ── Calculation box ── */
.article-calc {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  margin: 48px 0;
}

.article-calc-title {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  padding: 20px 28px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg);
}

.article-calc-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 13px 28px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  color: var(--ink-2);
}
.article-calc-row:last-child { border-bottom: 0; }

.article-calc-row.total {
  font-weight: 700;
  color: var(--ink);
  font-size: 16px;
  background: var(--bg-warm);
  border-top: 1px solid var(--line);
}

.article-calc-row .val {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--ink);
  font-size: 14px;
}
.article-calc-row.total .val {
  font-size: 18px;
}

/* ── Inline CTA ── */
.article-cta-inline {
  background: var(--ink);
  border-radius: 18px;
  padding: 36px 40px;
  margin: 64px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
}

.article-cta-inline-text {
  color: rgba(255,255,255,.6);
  font-size: 15px;
  line-height: 1.5;
  margin: 0;
}
.article-cta-inline-text strong {
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  display: block;
  margin-bottom: 5px;
}

.article-cta-inline .btn {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 100px;
  text-decoration: none;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background .15s ease;
  flex-shrink: 0;
}
.article-cta-inline .btn:hover { background: rgba(255,255,255,.18); }

/* ── Divider ── */
.article-divider {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 64px 0;
}

/* ── Final CTA ── */
.article-cta-final {
  border: 1px solid var(--line);
  background: var(--bg-warm);
  border-radius: 20px;
  padding: 56px 48px;
  margin: 16px 0 96px;
  text-align: center;
}

.article-cta-final h2 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.025em;
  line-height: 1.2;
  margin: 0 0 14px;
}

.article-cta-final p {
  font-size: 16px;
  color: var(--ink-3);
  margin: 0 0 32px;
  line-height: 1.6;
}

.article-cta-final-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-dark {
  background: var(--ink);
  color: #fff;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 26px;
  border-radius: 100px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: opacity .15s ease;
}
.btn-dark:hover { opacity: .85; }

.btn-ghost {
  background: transparent;
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  padding: 14px 26px;
  border-radius: 100px;
  border: 1px solid var(--line);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: border-color .15s ease, color .15s ease;
}
.btn-ghost:hover { border-color: var(--ink-3); color: var(--ink); }

/* ── Related articles ── */
.article-related {
  margin: 0 0 16px;
  padding: 48px 0 0;
  border-top: 1px solid var(--line);
  max-width: 680px;
}
.article-related-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-family: var(--mono);
  color: var(--ink-4);
  margin: 0 0 20px;
}
.article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 48px;
}
.article-related-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.article-related-card:hover {
  border-color: rgba(21,20,27,.18);
  box-shadow: 0 4px 16px -4px rgba(21,20,27,.08);
}
.article-related-tag {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.article-related-h {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
  letter-spacing: -.01em;
}
@media (max-width: 700px) {
  .article-related-grid { grid-template-columns: 1fr; }
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .article-page-wrap { padding: 0 20px; }
  .article-header { padding: 72px 0 48px; }
  .article-cta-inline { flex-direction: column; align-items: flex-start; padding: 28px 24px; }
  .article-cta-final { padding: 40px 24px; }
  .article-stat { padding: 28px 24px; }
  .article-calc-row, .article-calc-title { padding-left: 20px; padding-right: 20px; }
}