/* ═══════════════════════════════════════════
   QA de Fondo — qadefondo.eder-jam.cl
   Identidad editorial independiente
   Sistema de diseño: Azul tinta + papel + criterio
   ═══════════════════════════════════════════ */

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

:root {
  --ink:        #0b1929;
  --ink-2:      #162640;
  --ink-3:      #1e3555;

  --paper:      #f7f4ef;
  --paper-2:    #ede9e2;
  --paper-3:    #e3ddd4;

  --blue:       #1746a2;
  --blue-2:     #1d5cbf;
  --blue-3:     #4a82d4;
  --blue-pale:  #dce8fa;
  --blue-ghost: #f0f5fd;

  --amber:      #b45309;
  --amber-pale: #fef3c7;

  --green:      #166534;
  --green-pale: #dcfce7;

  --red:        #991b1b;
  --red-pale:   #fee2e2;

  --text:       var(--ink);
  --text-2:     #2d4a63;
  --text-3:     #5a7a94;
  --text-4:     #8fa8be;

  --bg:         #ffffff;
  --bg-2:       var(--paper);
  --bg-3:       var(--paper-2);
  --border:     rgba(11,25,41,0.08);
  --border-2:   rgba(11,25,41,0.15);

  --serif: 'Lora', Georgia, serif;
  --sans:  'Inter', system-ui, sans-serif;

  --r-sm:   4px;
  --r-md:   8px;
  --r-lg:   14px;
  --r-xl:   22px;
  --r-full: 100px;

  --sh-sm: 0 1px 4px rgba(11,25,41,0.07);
  --sh-md: 0 4px 16px rgba(11,25,41,0.09);
  --sh-lg: 0 16px 48px rgba(11,25,41,0.11);
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--sans); background: var(--bg); color: var(--text); line-height: 1.7; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
h1,h2,h3,h4 { font-family: var(--serif); line-height: 1.18; letter-spacing: -0.025em; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.75rem; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.visible { opacity: 1; transform: none; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.67rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--text-3); margin-bottom: 1rem;
}
.eyebrow::before { content: '//'; color: var(--blue-2); font-family: monospace; }

/* ═══════════════════════════════════════════
   NAV
═══════════════════════════════════════════ */
#nav {
  position: sticky; top: 0; z-index: 100; height: 62px;
  display: flex; align-items: center;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
#nav.scrolled { box-shadow: var(--sh-md); }

.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 1.75rem;
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.nav-brand { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; }
.nav-mark {
  width: 34px; height: 34px; border-radius: var(--r-md);
  background: var(--ink); display: flex; align-items: center; justify-content: center;
  font-family: serif; font-size: 15px; color: rgba(255,255,255,0.9); font-weight: 700;
  flex-shrink: 0; letter-spacing: -0.02em;
}
.nav-brand-text {}
.nav-site { font-family: var(--serif); font-size: 1rem; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; line-height: 1.1; }
.nav-by { font-size: 0.62rem; color: var(--text-3); letter-spacing: 0.05em; }

.nav-links { display: flex; list-style: none; }
.nav-links a {
  font-size: 0.76rem; font-weight: 500; color: var(--text-3);
  padding: 0 0.9rem; height: 62px; display: flex; align-items: center;
  border-bottom: 2px solid transparent; letter-spacing: 0.02em;
  transition: color 0.18s, border-color 0.18s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--blue); border-bottom-color: var(--blue); font-weight: 600; }

.nav-right { display: flex; align-items: center; gap: 0.6rem; }
.nav-back {
  font-size: 0.72rem; font-weight: 600; color: var(--text-3);
  border: 1.5px solid var(--border-2); padding: 0.4rem 0.9rem; border-radius: var(--r-full);
  display: flex; align-items: center; gap: 0.3rem; transition: all 0.18s;
}
.nav-back:hover { background: var(--ink); color: #fff; border-color: var(--ink); }
.nav-suscribir {
  font-size: 0.72rem; font-weight: 700; color: #fff;
  background: var(--blue); border: 1.5px solid var(--blue); padding: 0.4rem 0.9rem; border-radius: var(--r-full);
  transition: background 0.18s;
}
.nav-suscribir:hover { background: var(--blue-2); }

.nav-burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 6px; }
.nav-burger span { display: block; width: 20px; height: 1.5px; background: var(--ink); transition: 0.3s; }

.nav-mobile {
  display: none; position: fixed; top: 62px; left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border);
  padding: 1.25rem 1.75rem; flex-direction: column; gap: 0; z-index: 99;
}
.nav-mobile.open { display: flex; }
.nav-mobile a { font-size: 0.95rem; color: var(--text-2); padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.nav-mobile a.back-link { color: var(--blue); border: none; margin-top: 0.5rem; }

/* ═══════════════════════════════════════════
   HOME HERO
═══════════════════════════════════════════ */
.home-hero {
  padding: 5rem 0 4.5rem;
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.home-hero::after {
  content: 'QA';
  position: absolute; right: 2rem; top: 50%; transform: translateY(-50%);
  font-family: var(--serif); font-size: clamp(120px,20vw,260px);
  font-weight: 700; color: rgba(23,70,162,0.04);
  letter-spacing: -0.04em; pointer-events: none; user-select: none;
}
.hero-grid {
  max-width: 1100px; margin: 0 auto; padding: 0 1.75rem;
  display: grid; grid-template-columns: 1fr 360px; gap: 5rem; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--blue); background: var(--blue-ghost); border: 1px solid var(--blue-pale);
  padding: 0.35rem 0.875rem; border-radius: var(--r-full); margin-bottom: 1.75rem;
}
.hero-badge::before { content: '◆'; font-size: 0.5rem; }

h1.htitle {
  font-family: var(--serif); font-size: clamp(2.4rem,5vw,4rem);
  font-weight: 700; line-height: 1.06; letter-spacing: -0.03em;
  color: var(--ink); margin-bottom: 1.5rem;
}
h1.htitle em { font-style: italic; color: var(--blue-2); }

.hero-desc { font-size: 1.02rem; color: var(--text-2); line-height: 1.82; max-width: 500px; margin-bottom: 2.25rem; }
.hero-desc strong { color: var(--ink); font-weight: 600; }

.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.875rem; font-weight: 600; padding: 0.7rem 1.5rem; border-radius: var(--r-full); transition: all 0.18s; border: 1.5px solid transparent; cursor: pointer; font-family: var(--sans); }
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: var(--ink-2); transform: translateY(-1px); }
.btn-outline { background: transparent; border-color: var(--border-2); color: var(--text-2); }
.btn-outline:hover { border-color: var(--ink); color: var(--ink); }
.btn-blue { background: var(--blue); color: #fff; }
.btn-blue:hover { background: var(--blue-2); transform: translateY(-1px); }

/* Hero card */
.hero-card {
  background: var(--ink); border-radius: var(--r-xl); padding: 2.25rem;
  position: relative; overflow: hidden;
}
.hero-card::before {
  content: ''; position: absolute; top: -50px; right: -50px;
  width: 180px; height: 180px; border-radius: 50%;
  background: rgba(23,70,162,0.18);
}
.hcard-author { display: flex; align-items: center; gap: 0.875rem; margin-bottom: 1.75rem; position: relative; }
.hcard-avatar {
  width: 50px; height: 50px; border-radius: 50%;
  background: rgba(255,255,255,0.1); border: 2px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 1.15rem; font-weight: 700;
  color: rgba(255,255,255,0.85); flex-shrink: 0; overflow: hidden;
}
.hcard-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.hcard-name { font-size: 0.925rem; font-weight: 600; color: #fff; }
.hcard-role { font-size: 0.7rem; color: rgba(255,255,255,0.42); margin-top: 2px; letter-spacing: 0.03em; }

.hstats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: rgba(255,255,255,0.07); border-radius: var(--r-md); overflow: hidden; }
.hstat { padding: 1.25rem 1rem; background: rgba(255,255,255,0.04); transition: background 0.2s; }
.hstat:hover { background: rgba(255,255,255,0.08); }
.hstat-n { font-family: var(--serif); font-size: 2rem; font-weight: 700; color: #fff; line-height: 1; letter-spacing: -0.04em; }
.hstat-l { font-size: 0.6rem; color: rgba(255,255,255,0.36); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 0.3rem; }

.hquote { margin-top: 1.5rem; padding: 1rem 1.25rem; border-left: 2px solid rgba(23,70,162,0.7); background: rgba(255,255,255,0.04); border-radius: 0 var(--r-md) var(--r-md) 0; }
.hquote p { font-family: var(--serif); font-style: italic; font-size: 0.875rem; color: rgba(255,255,255,0.68); line-height: 1.6; }
.hquote cite { font-size: 0.62rem; color: rgba(255,255,255,0.28); margin-top: 6px; display: block; font-style: normal; letter-spacing: 0.04em; }

/* ═══════════════════════════════════════════
   HOME — PILARES
═══════════════════════════════════════════ */
.pilares-section { padding: 5rem 0; background: var(--bg-2); border-bottom: 1px solid var(--border); }
.pilares-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 5rem; align-items: center; }
.pilares-text h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); color: var(--ink); margin-bottom: 1.25rem; }
.pilares-text h2 em { font-style: italic; color: var(--blue-2); }
.pilares-text p { font-size: 0.97rem; color: var(--text-2); line-height: 1.85; margin-bottom: 1rem; }
.pilares-text p strong { color: var(--ink); }
.pilar-list { display: flex; flex-direction: column; gap: 0.75rem; }
.pilar {
  padding: 1.5rem 1.75rem; background: var(--bg); border: 1px solid var(--border);
  border-left: 3px solid var(--blue); border-radius: 0 var(--r-md) var(--r-md) 0;
  transition: transform 0.2s, box-shadow 0.2s;
}
.pilar:hover { transform: translateX(4px); box-shadow: var(--sh-sm); }
.pilar-icon { font-size: 1.1rem; margin-bottom: 0.5rem; }
.pilar h4 { font-family: var(--sans); font-size: 0.88rem; font-weight: 700; color: var(--ink); margin-bottom: 0.3rem; }
.pilar p { font-size: 0.815rem; color: var(--text-3); line-height: 1.7; }

/* ═══════════════════════════════════════════
   ARTÍCULOS / BLOG GRID
═══════════════════════════════════════════ */
.articles-section { padding: 5rem 0; border-bottom: 1px solid var(--border); }
.sec-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 3rem; flex-wrap: wrap; gap: 1rem; }
.sec-header h2 { font-size: clamp(1.5rem,3vw,2.2rem); color: var(--ink); }
.sec-header h2 em { font-style: italic; color: var(--blue-2); }
.link-ver-todo { font-size: 0.78rem; font-weight: 600; color: var(--blue); display: flex; align-items: center; gap: 0.3rem; transition: gap 0.18s; white-space: nowrap; }
.link-ver-todo:hover { gap: 0.5rem; }

.art-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 1.25rem; }
.art-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-lg);
  overflow: hidden; display: flex; flex-direction: column;
  transition: box-shadow 0.22s, transform 0.22s;
}
.art-card:hover { box-shadow: var(--sh-lg); transform: translateY(-3px); }
.art-thumb {
  height: 155px; background: var(--ink); position: relative; overflow: hidden;
}
.art-glow {
  position: absolute; inset: 0;
  background-image: radial-gradient(ellipse at 30% 55%, rgba(23,70,162,0.35) 0%, transparent 60%),
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 100% 100%, 28px 28px, 28px 28px;
}
.art-cat { position: absolute; bottom: 0.75rem; left: 0.875rem; font-size: 0.6rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.55); background: rgba(0,0,0,0.4); padding: 0.2rem 0.55rem; border-radius: var(--r-full); backdrop-filter: blur(4px); }
.art-featured-badge { position: absolute; top: 0.75rem; right: 0.875rem; font-size: 0.58rem; font-weight: 700; letter-spacing: 0.1em; background: var(--blue); color: #fff; padding: 0.22rem 0.6rem; border-radius: var(--r-full); }

.art-body { padding: 1.1rem 1.25rem 1.4rem; flex: 1; display: flex; flex-direction: column; }
.art-date { font-size: 0.67rem; color: var(--text-4); margin-bottom: 0.5rem; letter-spacing: 0.02em; }
.art-title { font-family: var(--serif); font-size: 1rem; font-weight: 700; color: var(--ink); line-height: 1.3; margin-bottom: 0.5rem; transition: color 0.18s; }
.art-card:hover .art-title { color: var(--blue); }
.art-card.featured .art-title { font-size: 1.15rem; }
.art-excerpt { font-size: 0.815rem; color: var(--text-3); line-height: 1.7; flex: 1; }
.art-read { display: inline-flex; align-items: center; gap: 0.3rem; margin-top: 0.875rem; font-size: 0.73rem; font-weight: 600; color: var(--blue); transition: gap 0.18s; }
.art-card:hover .art-read { gap: 0.5rem; }

/* ═══════════════════════════════════════════
   GUÍAS PREVIEW (Home)
═══════════════════════════════════════════ */
.guias-preview-section { padding: 5rem 0; background: var(--bg-2); border-bottom: 1px solid var(--border); }
.guia-row {
  display: grid; grid-template-columns: 2.25rem 1fr 1.5rem;
  gap: 1.5rem; align-items: center; padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer; transition: padding-left 0.2s;
}
.guia-row:first-child { border-top: 1px solid var(--border); }
.guia-row:hover { padding-left: 0.625rem; }
.grow-num { font-family: var(--serif); font-size: 0.85rem; color: var(--text-4); font-weight: 600; text-align: right; }
.grow-title { font-family: var(--serif); font-size: 1rem; font-weight: 700; color: var(--ink); transition: color 0.18s; margin-bottom: 0.3rem; }
.guia-row:hover .grow-title { color: var(--blue); }
.grow-meta { font-size: 0.7rem; color: var(--text-4); }
.grow-tags { display: flex; gap: 0.4rem; margin-bottom: 0.4rem; flex-wrap: wrap; }
.grow-arr { color: var(--text-4); font-size: 0.95rem; transition: all 0.18s; }
.guia-row:hover .grow-arr { color: var(--blue); transform: translateX(3px); }

/* Badges */
.badge { font-size: 0.58rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; padding: 0.18rem 0.5rem; border-radius: var(--r-full); border: 1px solid; white-space: nowrap; }
.b-principiante { color: var(--green); border-color: rgba(22,101,52,0.25); background: var(--green-pale); }
.b-intermedio   { color: var(--amber); border-color: rgba(180,83,9,0.25); background: var(--amber-pale); }
.b-avanzado     { color: var(--blue); border-color: rgba(23,70,162,0.25); background: var(--blue-ghost); }
.b-cat { color: var(--text-3); border-color: var(--border-2); background: var(--bg-3); }
.b-nuevo { color: var(--blue-2); border-color: rgba(29,92,191,0.35); background: var(--blue-ghost); }

/* ═══════════════════════════════════════════
   NEWSLETTER CTA BLOCK
═══════════════════════════════════════════ */
.nl-cta { padding: 5.5rem 0; background: var(--ink); position: relative; overflow: hidden; }
.nl-cta::before { content: ''; position: absolute; right: -80px; top: -80px; width: 350px; height: 350px; border-radius: 50%; background: rgba(23,70,162,0.14); }
.nl-cta-inner { max-width: 580px; margin: 0 auto; padding: 0 1.75rem; text-align: center; position: relative; z-index: 1; }
.nl-cta h2 { font-size: clamp(1.5rem,3vw,2.2rem); color: #fff; margin-bottom: 1rem; }
.nl-cta h2 em { font-style: italic; color: rgba(74,130,212,0.9); }
.nl-cta p { font-size: 0.95rem; color: rgba(255,255,255,0.5); line-height: 1.8; margin-bottom: 2rem; }
.nl-form { display: flex; gap: 0.5rem; max-width: 420px; margin: 0 auto; }
.nl-form input { flex: 1; background: rgba(255,255,255,0.09); border: 1.5px solid rgba(255,255,255,0.14); color: #fff; font-family: var(--sans); font-size: 0.875rem; padding: 0.7rem 1rem; border-radius: var(--r-full); outline: none; transition: border-color 0.2s; }
.nl-form input::placeholder { color: rgba(255,255,255,0.28); }
.nl-form input:focus { border-color: rgba(74,130,212,0.7); }
.nl-form button { background: var(--blue); color: #fff; border: none; font-family: var(--sans); font-size: 0.78rem; font-weight: 700; padding: 0.7rem 1.25rem; border-radius: var(--r-full); cursor: pointer; white-space: nowrap; transition: background 0.18s; }
.nl-form button:hover { background: var(--blue-2); }
.nl-note { font-size: 0.68rem; color: rgba(255,255,255,0.22); margin-top: 0.75rem; }

/* ═══════════════════════════════════════════
   PAGE HERO (interior pages)
═══════════════════════════════════════════ */
.page-hero { padding: 4.5rem 0 3.5rem; border-bottom: 1px solid var(--border); }
.page-hero h1 { font-size: clamp(2rem,4.5vw,3.4rem); color: var(--ink); margin-bottom: 1rem; }
.page-hero h1 em { font-style: italic; color: var(--blue-2); }
.page-hero-desc { font-size: 1rem; color: var(--text-2); max-width: 560px; line-height: 1.82; margin-bottom: 1.75rem; }
.page-meta { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.pmeta { font-size: 0.72rem; color: var(--text-4); display: flex; align-items: center; gap: 0.4rem; }
.pmeta-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--blue); flex-shrink: 0; }
.pmeta-dot.g { background: var(--green); }
.pmeta-dot.a { background: var(--amber); }

/* ═══════════════════════════════════════════
   GUÍAS PAGE — layout
═══════════════════════════════════════════ */
.page-layout { max-width: 1100px; margin: 0 auto; padding: 3rem 1.75rem 6rem; display: grid; grid-template-columns: 1fr 275px; gap: 4rem; align-items: start; }

.filters { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 2.5rem; padding-bottom: 1.75rem; border-bottom: 1px solid var(--border); }
.f-btn { font-size: 0.72rem; font-weight: 600; padding: 0.38rem 0.85rem; border-radius: var(--r-full); border: 1.5px solid var(--border-2); background: transparent; color: var(--text-3); cursor: pointer; transition: all 0.15s; letter-spacing: 0.02em; }
.f-btn:hover { border-color: var(--blue-3); color: var(--blue); }
.f-btn.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.f-sep { display: flex; align-items: center; padding: 0 0.15rem; color: var(--border-2); }

.guias-list { display: flex; flex-direction: column; }
.guia-card {
  display: grid; grid-template-columns: 42px 1fr 24px;
  gap: 1.25rem; align-items: start; padding: 2rem 0; border-bottom: 1px solid var(--border);
  cursor: pointer; transition: padding-left 0.2s;
}
.guia-card:first-child { border-top: 1px solid var(--border); }
.guia-card:hover { padding-left: 0.5rem; }
.gnum { font-family: var(--serif); font-size: 1.6rem; font-weight: 700; color: var(--paper-3); line-height: 1; text-align: right; letter-spacing: -0.04em; padding-top: 2px; }
.gtags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.6rem; }
.gtitle { font-family: var(--serif); font-size: 1.08rem; font-weight: 700; color: var(--ink); line-height: 1.32; margin-bottom: 0.5rem; transition: color 0.18s; }
.guia-card:hover .gtitle { color: var(--blue); }
.gdesc { font-size: 0.835rem; color: var(--text-3); line-height: 1.72; margin-bottom: 0.75rem; }
.gmeta-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.gm { font-size: 0.67rem; color: var(--text-4); display: flex; align-items: center; }
.gm:not(:first-child)::before { content: '·'; margin-right: 1rem; color: var(--border-2); }
.garr { color: var(--text-4); transition: all 0.2s; align-self: center; font-size: 0.9rem; }
.guia-card:hover .garr { color: var(--blue); transform: translateX(3px); }

/* Próximas */
.coming-list { display: flex; flex-direction: column; gap: 0.6rem; }
.coming-card { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; padding: 1.25rem 1.5rem; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-md); }
.coming-t { font-family: var(--serif); font-size: 0.95rem; color: var(--text-3); margin-bottom: 0.25rem; font-weight: 600; }
.coming-d { font-size: 0.775rem; color: var(--text-4); line-height: 1.6; }
.coming-pill { flex-shrink: 0; font-size: 0.58rem; font-weight: 700; letter-spacing: 0.1em; color: var(--text-4); border: 1px solid var(--border-2); padding: 0.22rem 0.6rem; border-radius: var(--r-full); background: var(--bg-3); white-space: nowrap; }

/* Sidebar */
.sidebar { position: sticky; top: 82px; display: flex; flex-direction: column; gap: 1.1rem; }
.sb { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; }
.sb-hd { padding: 0.875rem 1.25rem; border-bottom: 1px solid var(--border); font-size: 0.63rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-3); display: flex; align-items: center; gap: 0.4rem; }
.sb-hd::before { content: '//'; color: var(--blue-2); font-family: monospace; font-size: 0.63rem; }
.sb-bd { padding: 1.25rem; }
.sb-author-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.875rem; }
.sb-av { width: 40px; height: 40px; border-radius: 50%; background: var(--ink); display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 0.9rem; font-weight: 700; color: rgba(255,255,255,0.82); flex-shrink: 0; overflow: hidden; }
.sb-av img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.sb-name { font-size: 0.875rem; font-weight: 700; color: var(--ink); }
.sb-role { font-size: 0.67rem; color: var(--text-3); margin-top: 1px; }
.sb-bio { font-size: 0.79rem; color: var(--text-2); line-height: 1.72; margin-bottom: 1rem; }
.sb-links { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.sb-link { font-size: 0.67rem; font-weight: 700; color: var(--blue); border: 1.5px solid var(--blue-pale); padding: 0.28rem 0.7rem; border-radius: var(--r-full); background: var(--blue-ghost); transition: all 0.15s; }
.sb-link:hover { background: var(--blue); color: #fff; border-color: var(--blue); }

.sb-cats { display: flex; flex-direction: column; gap: 1px; }
.sb-cat { display: flex; align-items: center; justify-content: space-between; padding: 0.5rem 0.75rem; border-radius: var(--r-sm); font-size: 0.8rem; color: var(--text-2); cursor: pointer; background: none; border: none; font-family: var(--sans); transition: background 0.15s; text-align: left; width: 100%; }
.sb-cat:hover { background: var(--bg-3); color: var(--ink); }
.sb-cat.active { background: var(--blue-ghost); color: var(--blue); font-weight: 700; }
.sb-cnt { font-size: 0.63rem; color: var(--text-4); background: var(--bg-3); padding: 0.1rem 0.4rem; border-radius: var(--r-full); border: 1px solid var(--border); }

.sb-nl-input { width: 100%; background: var(--bg); border: 1.5px solid var(--border-2); color: var(--text); font-family: var(--sans); font-size: 0.825rem; padding: 0.6rem 0.875rem; border-radius: var(--r-md); outline: none; margin-bottom: 0.5rem; transition: border-color 0.18s; }
.sb-nl-input:focus { border-color: var(--blue); }
.sb-nl-input::placeholder { color: var(--text-4); }
.sb-nl-btn { width: 100%; background: var(--blue); color: #fff; border: none; font-family: var(--sans); font-size: 0.78rem; font-weight: 700; padding: 0.65rem; border-radius: var(--r-md); cursor: pointer; transition: background 0.18s; }
.sb-nl-btn:hover { background: var(--blue-2); }
.sb-nl-note { font-size: 0.66rem; color: var(--text-4); text-align: center; margin-top: 0.4rem; }
.spills { display: flex; flex-wrap: wrap; gap: 0.38rem; }
.spill { font-size: 0.63rem; font-weight: 600; padding: 0.25rem 0.55rem; border-radius: var(--r-full); border: 1px solid var(--border-2); color: var(--text-3); background: var(--bg); }

/* ═══════════════════════════════════════════
   BLOG PAGE
═══════════════════════════════════════════ */
.blog-page { max-width: 1100px; margin: 0 auto; padding: 3rem 1.75rem 6rem; }
.blog-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.25rem; }

/* ═══════════════════════════════════════════
   STACK PAGE
═══════════════════════════════════════════ */
.stack-page { max-width: 1100px; margin: 0 auto; padding: 4rem 1.75rem 6rem; }
.filosof-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.1rem; margin-top: 2rem; margin-bottom: 4.5rem; }
.filosof-card { padding: 2rem 1.75rem; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); border-top: 3px solid var(--blue); transition: box-shadow 0.2s, transform 0.2s; }
.filosof-card:hover { box-shadow: var(--sh-md); transform: translateY(-2px); }
.filosof-icon { font-size: 1.4rem; margin-bottom: 0.875rem; }
.filosof-card h3 { font-family: var(--sans); font-size: 0.875rem; font-weight: 700; color: var(--ink); margin-bottom: 0.4rem; }
.filosof-card p { font-size: 0.82rem; color: var(--text-3); line-height: 1.72; }
.stack-section-lbl { font-size: 0.63rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-4); margin-bottom: 0.875rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); margin-top: 2.5rem; }
.tools { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tool { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.78rem; font-weight: 500; padding: 0.42rem 0.875rem; border-radius: var(--r-full); border: 1.5px solid var(--border-2); color: var(--text-2); background: var(--bg); transition: all 0.15s; }
.tool:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-ghost); }
.mentoria-cta { background: var(--ink); border-radius: var(--r-xl); padding: 3rem; display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; margin-top: 4rem; }
.mentoria-cta h3 { font-size: clamp(1.4rem,2.5vw,1.9rem); color: #fff; margin-bottom: 1rem; }
.mentoria-cta h3 em { font-style: italic; color: rgba(74,130,212,0.85); }
.mentoria-cta p { font-size: 0.9rem; color: rgba(255,255,255,0.5); line-height: 1.8; margin-bottom: 1.25rem; }
.mentoria-items { display: flex; flex-direction: column; gap: 0.6rem; }
.mi { padding: 1.1rem 1.4rem; background: rgba(255,255,255,0.04); border-radius: var(--r-md); border-left: 2px solid rgba(74,130,212,0.45); }
.mi h4 { font-family: var(--sans); font-size: 0.82rem; font-weight: 700; color: rgba(255,255,255,0.78); margin-bottom: 0.2rem; }
.mi p { font-size: 0.77rem; color: rgba(255,255,255,0.36); line-height: 1.6; }

/* ═══════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════ */
#footer { background: var(--ink); border-top: 1px solid rgba(255,255,255,0.05); padding: 3.5rem 0 2rem; }
.footer-grid { max-width: 1100px; margin: 0 auto; padding: 0 1.75rem; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-brand-name { font-family: var(--serif); font-size: 1.05rem; font-weight: 700; color: #fff; margin-bottom: 0.5rem; }
.footer-brand-desc { font-size: 0.79rem; color: rgba(255,255,255,0.36); line-height: 1.72; max-width: 230px; margin-bottom: 1rem; }
.fsoc { display: flex; gap: 0.5rem; }
.fsoc a { font-size: 0.67rem; font-weight: 700; color: rgba(255,255,255,0.42); border: 1px solid rgba(255,255,255,0.1); padding: 0.28rem 0.72rem; border-radius: var(--r-full); transition: all 0.15s; }
.fsoc a:hover { color: #fff; border-color: rgba(255,255,255,0.28); }
.footer-col h4 { font-size: 0.62rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: rgba(255,255,255,0.22); margin-bottom: 1rem; }
.footer-col a { display: block; font-size: 0.79rem; color: rgba(255,255,255,0.42); padding: 0.28rem 0; transition: color 0.15s; }
.footer-col a:hover { color: rgba(255,255,255,0.78); }
.footer-btm { max-width: 1100px; margin: 0 auto; padding: 1.5rem 1.75rem 0; border-top: 1px solid rgba(255,255,255,0.05); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.footer-btm p { font-size: 0.7rem; color: rgba(255,255,255,0.2); }
.footer-btm a { font-size: 0.7rem; color: rgba(255,255,255,0.28); transition: color 0.15s; }
.footer-btm a:hover { color: rgba(255,255,255,0.55); }

/* ═══════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-card { max-width: 480px; }
  .pilares-grid-2 { grid-template-columns: 1fr; gap: 2.5rem; }
  .art-grid { grid-template-columns: 1fr 1fr; }
  .page-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .filosof-grid { grid-template-columns: 1fr 1fr; }
  .mentoria-cta { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-back { display: none; }
  /* Nav brand compact on mobile */
  .nav-brand { gap: 0.5rem; }
  .nav-by { display: none; }
  .nav-site { font-size: 0.875rem; }
  .nav-mark { width: 28px; height: 28px; font-size: 12px; }
  .nav-inner { padding: 0 1rem; }
  .nav-right { gap: 0.4rem; }
  .nav-suscribir { font-size: 0.68rem; padding: 0.35rem 0.75rem; }
  /* Content */
  .art-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .guia-card { grid-template-columns: 34px 1fr; }
  .garr { display: none; }
  .filosof-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  /* Hero card on mobile */
  .hero-card { max-width: 100%; }
  .hstats { grid-template-columns: 1fr 1fr; }
  /* Page hero */
  .page-hero { padding: 3rem 0 2.5rem; }
  .page-hero h1 { font-size: 2rem; }
  /* Guías sidebar */
  .guia-body { padding: 2rem 1.25rem 4rem; }
  .guia-header-inner { padding: 0 1.25rem; }
  .guia-nav { padding: 0 1.25rem 3rem; flex-direction: column; }
  .guia-nav-btn.next { margin-left: 0; text-align: left; }
}
@media (max-width: 480px) {
  .nl-form { flex-direction: column; }
  .home-hero { padding: 2.5rem 0 2rem; }
  h1.htitle { font-size: 2.1rem; }
  .hstats { grid-template-columns: 1fr 1fr; }
  .hstat-n { font-size: 1.6rem; }
  .container { padding: 0 1.25rem; }
  .hero-grid { padding: 0 1.25rem; }
  .pilares-grid-2 { padding: 0 1.25rem; }
  .guia-body h2 { font-size: 1.35rem; }
  .code-block pre { font-size: 0.72rem; }
}