/* ═══════════════════════════════════════════════════════════════
   NETSOLIN-IA · presentacion.html (capítulo «Presentación»)
   Solo lo propio de esta página; tokens y componentes base vienen de
   styles.css (ver DESIGN.md). Prefijo .pz- para no chocar con el resto.
   ═══════════════════════════════════════════════════════════════ */

.pz{padding:8px 0 88px}
.pz-grid{display:grid;grid-template-columns:232px minmax(0,1fr);gap:56px;align-items:start}

/* Índice fijo del capítulo */
.pz-toc{
  position:sticky;top:92px;max-height:calc(100dvh - 112px);overflow-y:auto;
  background:var(--surface);border:1px solid var(--hairline);border-radius:var(--r-md);padding:16px 12px;
}
.pz-toc ol{list-style:none;display:flex;flex-direction:column;gap:1px}
.pz-toc a{display:flex;align-items:center;min-height:36px;font-size:14.5px;line-height:1.3;color:var(--ink-2);padding:6px 8px;border-radius:6px}
.pz-toc a:hover{background:var(--sunk);color:var(--ink)}
.pz-toc a.is-on{background:var(--primary-soft);color:var(--ink);font-weight:500}
.pz-toc .pz-pdf{margin:12px 8px 2px;padding-top:12px;border-top:1px solid var(--hairline)}
.pz-toc .pz-pdf a{color:var(--primary);font-weight:500;padding:6px 0;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.pz-toc .pz-pdf a:hover{background:none;color:var(--primary-hover)}

/* Cuerpo */
.pz-body{min-width:0}
.pz-body>section{margin-bottom:84px;scroll-margin-top:96px}
.pz-body>section:last-child{margin-bottom:0}
.pz-body h2{font-size:clamp(26px,2.9vw,36px);margin-bottom:14px;max-width:24ch}
.pz-body .pz-lead{font-size:17.5px;color:var(--ink-2);max-width:66ch;margin-bottom:28px}
.pz-body h3.pz-sub{font-size:19px;margin:36px 0 14px}
.pz-body .answer{margin-bottom:28px}
.pz-more{margin-top:18px;font-size:15.5px;color:var(--muted)}

/* Cifras de entrada */
.pz-figs{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--surface);overflow:hidden}
.pz-fig{padding:20px 22px}
.pz-fig+.pz-fig{border-left:1px solid var(--hairline)}
.pz-fig strong{display:block;font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:500;font-size:clamp(28px,3vw,38px);letter-spacing:-.03em;line-height:1.1;color:var(--ink)}
.pz-fig span{display:block;margin-top:6px;font-size:14.5px;line-height:1.4;color:var(--muted)}

/* Lista de exigencias: lo que se pide ↔ cómo se responde */
.pz-req{border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--surface);overflow:hidden}
.pz-req-head,.pz-req-row{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.pz-req-head{background:var(--sunk);border-bottom:1px solid var(--hairline);font:500 12px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.pz-req-head span{padding:12px 20px}
.pz-req-row{border-bottom:1px solid var(--hairline)}
.pz-req-row:last-child{border-bottom:0}
.pz-req-row>div{padding:16px 20px;font-size:15.5px}
.pz-req-q{color:var(--ink);font-weight:500}
.pz-req-a{color:var(--ink-2);background:var(--primary-tint);border-left:1px solid var(--hairline)}

/* Inventario por áreas, como libro mayor */
.pz-map{border-top:1px solid var(--hairline-2)}
.pz-area{display:grid;grid-template-columns:220px minmax(0,1fr);gap:28px;padding:22px 0;border-bottom:1px solid var(--hairline)}
.pz-area h3{font-size:17px;margin-bottom:4px}
.pz-area .pz-n{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:13px;color:var(--muted)}
.pz-area ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.pz-area li{font-size:14.5px;line-height:1.35;color:var(--ink-2);background:var(--surface);border:1px solid var(--hairline);border-radius:var(--r-sm);padding:6px 11px}
.pz-area li.ia{border-color:#CFC8F7;background:var(--primary-tint);color:var(--ink)}
.pz-legend{display:flex;align-items:center;gap:8px;margin-top:14px;font-size:14px;color:var(--muted)}
.pz-legend i{display:inline-block;width:14px;height:14px;border-radius:4px;border:1px solid #CFC8F7;background:var(--primary-tint)}

/* Dónde trabaja la IA: cuatro capas */
.pz-layers{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.pz-layer{background:var(--surface);border:1px solid var(--hairline);border-radius:var(--r-md);padding:22px}
.pz-layer .pz-where{display:block;font:500 12px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--primary);margin-bottom:8px}
.pz-layer h3{font-size:18px;margin-bottom:10px}
.pz-layer ul{list-style:none;display:flex;flex-direction:column;gap:7px}
.pz-layer li{position:relative;padding-left:16px;font-size:15px;color:var(--ink-2)}
.pz-layer li::before{content:"";position:absolute;left:0;top:.68em;width:6px;height:1.5px;background:var(--hairline-2)}

/* Escalera: asistente → agente → empleado digital */
.pz-ladder{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--surface);overflow:hidden;align-items:stretch}
.pz-step{padding:24px 22px;border-left:1px solid var(--hairline)}
.pz-step:first-child{border-left:0}
.pz-step .pz-when{display:block;font:500 12px/1.4 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.pz-step h3{font-size:19px;margin-bottom:8px}
.pz-step p{font-size:15px;color:var(--muted)}
.pz-step .pz-resp{display:block;margin-top:14px;padding-top:12px;border-top:1px dashed var(--hairline-2);font-size:14px;font-weight:500;color:var(--ink)}
.pz-step.is-now{background:var(--primary-tint);box-shadow:inset 0 3px 0 var(--primary)}
.pz-step.is-now .pz-when{color:var(--primary)}

/* Lista en dos columnas con marca */
.pz-two{columns:2;column-gap:36px}
.pz-two li{break-inside:avoid}

/* Diez razones */
.pz-reasons{list-style:none;counter-reset:rz;display:grid;grid-template-columns:repeat(2,1fr);gap:0 36px;border-top:1px solid var(--hairline-2)}
.pz-reasons li{counter-increment:rz;display:grid;grid-template-columns:38px 1fr;gap:4px;padding:18px 0;border-bottom:1px solid var(--hairline);font-size:15.5px;color:var(--ink-2)}
.pz-reasons li::before{content:counter(rz,decimal-leading-zero);font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:13px;color:var(--primary);padding-top:3px}
.pz-reasons b{display:block;font-size:16.5px;margin-bottom:3px}

/* Bloque de descarga */
.pz-dl{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;background:var(--surface);border:1px solid var(--hairline);border-radius:var(--r-lg);padding:26px 28px}
.pz-dl h2{font-size:clamp(22px,2.4vw,28px);margin-bottom:6px;max-width:none}
.pz-dl p{font-size:15.5px;color:var(--muted);max-width:52ch}
.pz-dl .hero-ctas{margin-top:0}

@media (max-width:1080px){
  .pz-grid{grid-template-columns:1fr;gap:32px}
  .pz-toc{position:static;max-height:none}
  .pz-toc ol{display:grid;grid-template-columns:1fr 1fr;gap:1px 16px}
  .pz-toc a{min-height:44px}
}
@media (max-width:860px){
  .pz-figs{grid-template-columns:repeat(2,1fr)}
  .pz-fig:nth-child(3){border-left:0}
  .pz-fig:nth-child(n+3){border-top:1px solid var(--hairline)}
  .pz-ladder{grid-template-columns:1fr}
  .pz-step{border-left:0;border-top:1px solid var(--hairline)}
  .pz-step:first-child{border-top:0}
  .pz-step.is-now{box-shadow:inset 3px 0 0 var(--primary)}
  .pz-area{grid-template-columns:1fr;gap:12px}
  .pz-reasons{grid-template-columns:1fr}
}
@media (max-width:640px){
  .pz{padding-bottom:64px}
  .pz-body>section{margin-bottom:60px}
  .pz-toc ol{grid-template-columns:1fr}
  .pz-layers{grid-template-columns:1fr}
  .pz-req-head{display:none}
  .pz-req-row{grid-template-columns:1fr}
  .pz-req-row>div{padding:14px 16px}
  .pz-req-q{padding-bottom:8px!important}
  .pz-req-a{border-left:0;border-top:1px dashed var(--hairline)}
  .pz-two{columns:1}
  .pz-dl{padding:22px 20px}
  .pz-dl .btn{width:100%}
}

@media print{
  .pz-toc,.nav,.fab-wa,.footer,.pz-dl,.hero-ctas{display:none!important}
  .pz-grid{grid-template-columns:1fr}
  .pz-body>section{break-inside:avoid-page;margin-bottom:36px}
}