/* ============================================
   Tema azul unificado — Dr. Arnulfo Villanueva Castillo
   Paleta igual que /divulgacion-redes/
   ============================================ */
:root{
  --primary:#3B82F6; --primary-light:#60A5FA; --accent:#0EA5E9; --accent-light:#38BDF8;
  --bg:#060B18; --bg-elevated:#0B1226; --bg-card:rgba(15,23,42,0.6);
  --border:rgba(255,255,255,0.06); --border-strong:rgba(255,255,255,0.12); --border-hover:rgba(96,165,250,0.45);
  --text:#F1F5F9; --text-secondary:#94A3B8; --text-muted:#64748B;
  --prim:var(--primary); --prim-d:var(--accent-light); --prim-l:rgba(59,130,246,0.12);
  --ink:var(--text); --muted:var(--text-secondary); --gold:var(--accent-light);
  --gris:var(--text-muted); --borde:var(--border-strong); --fondo:var(--bg);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  color:var(--text-secondary);background:var(--bg);line-height:1.65;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit}
::selection{background:rgba(59,130,246,.35);color:#fff}
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:5px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:rgba(59,130,246,.5)}
:focus-visible{outline:2px solid var(--primary-light);outline-offset:2px;border-radius:4px}
h1,h2,h3,h4{font-family:'Space Grotesk','Inter',sans-serif;color:var(--text);letter-spacing:-.02em}

/* Fondo decorativo */
body::before{content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,rgba(0,0,0,.9),transparent 70%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,rgba(0,0,0,.9),transparent 70%)}
body::after{content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse 60% 50% at 15% 10%,rgba(59,130,246,.10),transparent 60%),
             radial-gradient(ellipse 50% 40% at 85% 80%,rgba(14,165,233,.08),transparent 60%)}
header,main,footer{position:relative;z-index:1}

.contenedor{max-width:880px;margin:0 auto;padding:2rem 1.25rem}

/* ===== HEADER (glass) ===== */
.site-header{
  display:flex;flex-wrap:wrap;gap:.75rem 1.5rem;align-items:center;justify-content:space-between;
  padding:.85rem 1.25rem;position:sticky;top:0;z-index:100;
  background:rgba(6,11,24,.78);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--border);
}
.site-header .brand{
  color:var(--text);font-weight:800;font-size:.92rem;text-decoration:none;letter-spacing:-.01em;
  display:inline-flex;align-items:center;gap:8px;
}
.site-header .brand::before{
  content:'🐾';width:28px;height:28px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#3B82F6,#1D4ED8);font-size:13px;
  box-shadow:0 0 0 1px rgba(255,255,255,.08),0 4px 14px rgba(59,130,246,.35);
}
.site-header nav a{
  color:var(--text-secondary);text-decoration:none;margin-left:.55rem;font-size:.78rem;font-weight:600;
  padding:5px 9px;border-radius:8px;transition:color .2s,background .2s;
}
.site-header nav a:hover{color:var(--text);background:rgba(255,255,255,.05)}

/* ===== HERO ===== */
.hero{text-align:center;padding:3rem 0 2rem;position:relative;overflow:hidden}
.hero h1{font-size:2.1rem;margin-bottom:.5rem;font-weight:700}
.lead{font-size:1.1rem;color:var(--text-secondary);max-width:620px;margin:0 auto 1.5rem}

/* ===== BOTONES ===== */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:.7rem 1.3rem;border-radius:10px;
  background:linear-gradient(135deg,#3B82F6 0%,#1D4ED8 100%);color:#fff;text-decoration:none;
  font-weight:600;font-size:.92rem;transition:all .2s ease;
  box-shadow:0 4px 20px rgba(59,130,246,.35),inset 0 1px 0 rgba(255,255,255,.1);
}
.btn:hover{box-shadow:0 6px 28px rgba(59,130,246,.55);transform:translateY(-1px)}
.btn-destacado{background:linear-gradient(135deg,#0EA5E9 0%,#0284C7 100%);box-shadow:0 4px 20px rgba(14,165,233,.35)}
.btn-destacado:hover{box-shadow:0 6px 28px rgba(14,165,233,.55)}

/* ===== TARJETAS ===== */
.tarjetas{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin:2rem 0}
.card{
  background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:1.25rem;
  backdrop-filter:blur(10px);transition:all .3s;
}
.card:hover{border-color:var(--border-hover);transform:translateY(-3px)}
.card h3{margin-top:0}
.card a{color:var(--primary-light);font-weight:600;text-decoration:none}
.card a:hover{color:var(--accent-light)}

.destacado-blog h2{font-size:1.3rem}

/* ===== LISTA DE POSTS ===== */
.lista-posts{list-style:none;padding:0}
.lista-posts li{margin-bottom:1.25rem;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1rem 1.1rem;transition:border-color .25s}
.lista-posts li:hover{border-color:var(--border-hover)}
.lista-posts a{font-weight:700;color:var(--primary-light);text-decoration:none;font-size:1.08rem;font-family:'Space Grotesk',sans-serif}
.lista-posts a:hover{color:var(--accent-light)}
.lista-posts time{color:var(--text-muted);font-size:.8rem;margin-left:.5rem;font-family:'JetBrains Mono',monospace}
.lista-posts p{margin:.3rem 0 0;color:var(--text-secondary);font-size:.9rem}

.pagina img{max-width:100%;border-radius:10px}
.pagina h1{margin-bottom:1rem}

.aviso{
  font-size:.85rem;color:var(--text-secondary);border-left:3px solid var(--primary);
  padding-left:.75rem;background:rgba(59,130,246,.06);padding:.6rem .9rem;border-radius:0 8px 8px 0;
}

/* ===== FOOTER ===== */
.site-footer{
  margin-top:3rem;padding:2rem 1.25rem;text-align:center;
  background:var(--bg-elevated);border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem;
}
.site-footer a{color:var(--primary-light)}
.suscripcion{max-width:520px;margin:0 auto 1.5rem}
.suscripcion h2{font-size:1.15rem;color:var(--text);margin-bottom:.5rem}
.suscripcion form{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center}
.suscripcion input[type="email"]{
  flex:1 1 220px;padding:.7rem .85rem;border-radius:10px;
  border:1px solid var(--border-strong);background:rgba(15,23,42,.7);color:var(--text);
}
.suscripcion input[type="email"]::placeholder{color:var(--text-muted)}

.form-calculadora{display:flex;flex-direction:column;gap:.75rem;max-width:420px}
.form-calculadora input{
  padding:.7rem .85rem;border-radius:10px;border:1px solid var(--border-strong);
  background:rgba(15,23,42,.7);color:var(--text);
}
.form-calculadora .btn{align-self:flex-start}

/* ===== CHIPS ===== */
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{
  background:rgba(59,130,246,.08);border:1px solid rgba(96,165,250,.22);color:var(--primary-light);
  font-size:.85rem;font-weight:600;padding:8px 15px;border-radius:20px;
}

/* ===== PERFIL (pf-*) ===== */
.pf-hero{
  background:linear-gradient(135deg,#0B1226 0%,#0E1E42 55%,#0B1226 100%);
  border:1px solid var(--border);border-radius:16px;padding:38px 30px;text-align:center;margin-bottom:22px;
  position:relative;overflow:hidden;
}
.pf-hero::before{content:'';position:absolute;top:-45%;left:50%;transform:translateX(-50%);
  width:420px;height:320px;background:radial-gradient(circle,rgba(59,130,246,.18),transparent 65%);pointer-events:none}
.pf-hero>*{position:relative}
.pf-hero h2{font-size:1.5rem;margin-bottom:6px}
.pf-hero .sub{color:var(--text);font-weight:600;margin-bottom:4px}
.pf-hero .aff{font-size:.88rem;color:var(--text-secondary)}
.pf-badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px;justify-content:center}
.pf-badge{
  font-size:.74rem;font-weight:600;padding:6px 13px;border-radius:20px;color:var(--accent-light);
  background:rgba(14,165,233,.08);border:1px solid rgba(56,189,248,.4);
}
.pf-badge.gold{background:rgba(56,189,248,.1);color:var(--accent-light);border-color:rgba(56,189,248,.45)}
.pf-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:14px;margin:0 0 2rem}
.pf-stat{
  background:var(--bg-card);border:1px solid var(--border);border-top:3px solid var(--primary);
  border-radius:14px;padding:18px 12px;text-align:center;backdrop-filter:blur(10px);
}
.pf-stat .n{
  font-family:'Space Grotesk',sans-serif;font-size:1.7rem;font-weight:700;line-height:1;
  background:linear-gradient(135deg,#60A5FA,#38BDF8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.pf-stat .l{font-size:.74rem;color:var(--text-muted);margin-top:5px;font-weight:600;text-transform:uppercase;letter-spacing:.06em}
.pf-sec{
  background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:26px 28px;
  margin-bottom:18px;backdrop-filter:blur(10px);
}
.pf-sec h3{font-size:1.15rem;margin-bottom:12px;border-bottom:1px solid var(--border);padding-bottom:7px;display:flex;align-items:center;gap:8px}
.pf-sec p{font-size:.95rem;margin-bottom:10px}
.pf-sec p a{color:var(--primary-light);text-decoration:none}
.pf-sec p a:hover{color:var(--accent-light)}
.pf-sec ul{margin:0 0 10px;padding-left:0;list-style:none}
.pf-sec ul li{padding:7px 0 7px 26px;position:relative;font-size:.93rem}
.pf-sec ul li::before{content:"▸";position:absolute;left:4px;color:var(--primary-light);font-weight:700}
.pf-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
.pf-card{
  display:block;background:rgba(255,255,255,0.03);border:1px solid var(--border);border-left:4px solid var(--primary);
  border-radius:12px;padding:16px 18px;text-decoration:none;transition:all .25s;
}
.pf-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}
.pf-card b{display:block;color:var(--text);margin-bottom:4px;font-size:.95rem}
.pf-card span{font-size:.8rem;color:var(--text-secondary)}
.pf-btn{
  display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#3B82F6,#1D4ED8);color:#fff;
  text-decoration:none;padding:11px 22px;border-radius:10px;font-weight:700;font-size:.88rem;
  box-shadow:0 4px 20px rgba(59,130,246,.3);transition:all .2s;
}
.pf-btn:hover{box-shadow:0 6px 28px rgba(59,130,246,.5);transform:translateY(-1px)}
.pf-btn.sec{background:transparent;color:var(--primary-light);border:1.5px solid var(--primary);box-shadow:none}
.pf-btn.sec:hover{background:rgba(59,130,246,.1);box-shadow:none}
.pf-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}

/* ===== WHATSAPP FLOAT (deshabilitado por privacidad) ===== */
.whatsapp-float{display:none}

@media (max-width:600px){
  .hero h1{font-size:1.6rem}
  .site-header{justify-content:center;text-align:center}
}