/* topxapk-cl.com — «senda»: guía paso a paso, tema claro con cabecera azul noche */
:root{
  --sd-night:#090F1E; --sd-night2:#111A2B; --sd-night3:#1B2740;
  --sd-paper:#F4F2ED; --sd-card:#FFFFFF; --sd-ink:#0D1526; --sd-ink2:#3C465A; --sd-mute:#5F687B;
  --sd-line:#E2DDD2; --sd-red:#FF2400; --sd-red-d:#D81E00; --sd-red-soft:#FFEDE7;
  --sd-blue-soft:#E9EEF8;
  --sd-r:18px; --sd-r-s:12px;
  --sd-font:"Kumbh Sans","Segoe UI",Arial,sans-serif; --sd-mono:"Red Hat Mono",ui-monospace,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body.sd-p{margin:0;background:var(--sd-paper);color:var(--sd-ink);font:400 17px/1.65 var(--sd-font);overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--sd-red-d);text-underline-offset:3px;text-decoration-thickness:1.5px}
a:hover{color:var(--sd-night)}
:focus-visible{outline:3px solid var(--sd-red);outline-offset:3px;border-radius:6px}

/* barra de progreso de lectura (si el navegador la soporta) */
@supports (animation-timeline: scroll()){
  body.sd-p::before{content:"";position:fixed;inset:0 0 auto 0;height:4px;z-index:60;background:linear-gradient(90deg,var(--sd-red),#FF7A45);
    transform-origin:0 50%;transform:scaleX(0);animation:sd-prog linear both;animation-timeline:scroll(root)}
  @keyframes sd-prog{to{transform:scaleX(1)}}
}

.shell,.sd-wrap{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}

/* ===== cabecera ===== */
.top{background:var(--sd-night);position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(255,255,255,.08)}
.top-in{display:flex;align-items:center;gap:22px;min-height:68px}
.top-in > a:first-child{flex:0 0 auto;display:flex;align-items:center}
.top nav{display:flex;gap:4px;flex:1 1 auto;justify-content:center}
.top nav a{color:#D5DBE8;text-decoration:none;font-weight:600;font-size:15px;padding:10px 14px;border-radius:999px;min-height:44px;display:inline-flex;align-items:center}
.top nav a:hover{background:var(--sd-night3);color:#fff}
.btn.btn-main{flex:0 0 auto;background:var(--sd-red);color:#fff;text-decoration:none;font-weight:800;font-size:15px;padding:12px 20px;border-radius:999px;min-height:44px;display:inline-flex;align-items:center}
.btn.btn-main:hover{background:var(--sd-red-d);color:#fff}

/* ===== botones de contenido ===== */
.sd-go{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin:26px 0}
.sd-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:14px 26px;border-radius:999px;
  background:var(--sd-red);color:#fff;font-weight:800;font-size:17px;text-decoration:none;box-shadow:0 10px 24px -10px rgba(255,36,0,.65);transition:transform .15s,background .15s}
.sd-btn::after{content:"→";font-family:var(--sd-mono);font-weight:700}
.sd-btn:hover{background:var(--sd-red-d);color:#fff;transform:translateY(-1px)}
.sd-ad{font-size:13px;color:var(--sd-mute);letter-spacing:.02em}
.sd-upd{margin:6px 0 0;font-size:15px;color:var(--sd-mute)}

/* ===== hero ===== */
.sd-hero{position:relative}
.sd-eyebrow{display:inline-block;margin:0 0 14px;font-family:var(--sd-mono);font-weight:700;font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:var(--sd-red-d)}
.sd-hero h1{margin:0 0 16px;font-weight:800;line-height:1.12;letter-spacing:-.02em;font-size:clamp(30px,4.6vw,50px)}
.sd-lead{font-size:clamp(17px,1.6vw,19px);color:var(--sd-ink2);max-width:62ch;margin:0}

.sd-hero--home{background:radial-gradient(1200px 500px at 85% 10%,rgba(255,36,0,.22),transparent 60%),linear-gradient(160deg,var(--sd-night) 0%,var(--sd-night2) 70%,#18233A 100%);color:#fff;overflow:hidden}
.sd-hero--home::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:56px;background:var(--sd-paper);clip-path:polygon(0 100%,100% 0,100% 100%)}
.sd-hero--home .sd-hero-in{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding-top:64px;padding-bottom:96px}
.sd-hero--home .sd-eyebrow{color:#FF8A66}
.sd-hero--home .sd-lead{color:#C9D1E1}
.sd-hero--home .sd-ad,.sd-hero--home .sd-upd{color:#97A2BA}
.sd-hero-fig{margin:0;position:relative;justify-self:end;max-width:420px}
.sd-hero-fig img{border-radius:28px;box-shadow:0 30px 60px -20px rgba(0,0,0,.7);border:1px solid rgba(255,255,255,.08)}
.sd-hero-fig figcaption{position:absolute;left:-28px;bottom:28px;background:#fff;color:var(--sd-ink);border-radius:16px;padding:12px 16px;font-size:15px;line-height:1.35;max-width:220px;box-shadow:0 14px 30px -12px rgba(0,0,0,.5)}
.sd-hero-fig figcaption b{display:block;font-family:var(--sd-mono);color:var(--sd-red-d);font-size:20px}

.sd-hero--page{background:linear-gradient(180deg,#fff 0%,var(--sd-paper) 100%);border-bottom:1px solid var(--sd-line);padding:40px 0 34px;overflow:hidden}
.sd-hero--page::before{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;border:56px solid rgba(255,36,0,.07);pointer-events:none}
.sd-hero--page .sd-wrap{position:relative;max-width:1160px}
.sd-hero--page h1{max-width:22ch}
.sd-crumb{margin:0 0 18px;font-size:15px;color:var(--sd-mute)}
.sd-crumb a{color:var(--sd-ink2);text-decoration:none;font-weight:600}
.sd-crumb span{margin:0 6px;color:var(--sd-red)}
.sd-hero--slim{padding-bottom:26px}

/* ===== maquetación ===== */
.sd-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:56px;align-items:start;padding-top:40px;padding-bottom:72px}
.sd-grid .sd-art{grid-column:1;grid-row:1}
.sd-grid .sd-route{grid-column:2;grid-row:1;position:sticky;top:92px}
.sd-narrow{max-width:820px;padding-top:36px;padding-bottom:72px}
.sd-home{padding-top:20px;padding-bottom:80px;max-width:980px}
.sd-art{min-width:0}

/* ruta lateral */
.sd-route{background:var(--sd-night);color:#fff;border-radius:var(--sd-r);padding:22px 20px}
.sd-route-t{margin:0 0 14px;font-family:var(--sd-mono);font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:#FF8A66}
.sd-route ol{list-style:none;margin:0;padding:0;position:relative}
.sd-route ol::before{content:"";position:absolute;left:19px;top:20px;bottom:20px;width:2px;background:repeating-linear-gradient(180deg,#3A4763 0 6px,transparent 6px 11px)}
.sd-route li{position:relative;font-size:15px}
.sd-route a{display:flex;align-items:center;gap:12px;min-height:48px;padding:6px 8px 6px 0;color:#D3DAE8;text-decoration:none;font-weight:600}
.sd-route a b{flex:0 0 40px;height:40px;border-radius:50%;display:grid;place-items:center;background:var(--sd-night3);font-family:var(--sd-mono);font-size:14px;color:#fff;position:relative;z-index:1;border:2px solid #34415E}
.sd-route a:hover{color:#fff}
.sd-route li.is-here a{color:#fff}
.sd-route li.is-here a b{background:var(--sd-red);border-color:#FF8A66;box-shadow:0 0 0 5px rgba(255,36,0,.22)}

/* ===== secciones y texto ===== */
.sd-sec{margin:0 0 48px}
.sd-sec h2{font-size:clamp(24px,2.6vw,31px);line-height:1.2;letter-spacing:-.015em;margin:0 0 16px;font-weight:800;position:relative;padding-left:20px}
.sd-sec h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:6px;border-radius:6px;background:var(--sd-red)}
.sd-sec p{margin:0 0 16px}
.sd-sec h3{margin:0 0 6px;font-size:19px;line-height:1.3;font-weight:800}

/* pasos verticales */
.sd-steps{list-style:none;margin:26px 0;padding:0;position:relative;counter-reset:none}
.sd-steps::before{content:"";position:absolute;left:23px;top:24px;bottom:24px;width:3px;background:linear-gradient(180deg,var(--sd-red) 0%,#FFB49E 100%);border-radius:3px}
.sd-steps > li{display:flex;gap:20px;position:relative;margin:0 0 18px}
.sd-n{flex:0 0 48px;height:48px;border-radius:50%;display:grid;place-items:center;background:var(--sd-night);color:#fff;font-family:var(--sd-mono);font-weight:700;font-size:19px;position:relative;z-index:1;box-shadow:0 0 0 6px var(--sd-paper)}
.sd-sb{flex:1;min-width:0;background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r);padding:18px 22px;box-shadow:0 6px 18px -14px rgba(9,15,30,.35)}
.sd-sb p{margin:0}
.sd-sb .sd-fail{margin:14px 0 0}

/* bloques de aviso */
.sd-fail,.sd-tip{border-radius:var(--sd-r-s);padding:16px 20px;margin:22px 0}
.sd-fail{background:var(--sd-red-soft);border-left:5px solid var(--sd-red)}
.sd-tip{background:var(--sd-blue-soft);border-left:5px solid var(--sd-night3)}
.sd-fail p,.sd-tip p{margin:0}
.sd-fail .sd-fail-t,.sd-tip .sd-tip-t{font-family:var(--sd-mono);font-weight:700;font-size:15px;text-transform:uppercase;letter-spacing:.05em;margin:0 0 4px}
.sd-fail .sd-fail-t{color:var(--sd-red-d)}
.sd-fail .sd-fail-t::before{content:"!";display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--sd-red);color:#fff;margin-right:8px;font-size:14px}

/* datos clave */
.sd-facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:22px 0}
.sd-facts > div{background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r);padding:18px 20px;border-top:4px solid var(--sd-night)}
.sd-facts > div:nth-child(4){border-top-color:var(--sd-red)}
.sd-facts p{margin:0}
.sd-k{font-family:var(--sd-mono);font-weight:700;font-size:15px;letter-spacing:.04em;text-transform:uppercase;color:var(--sd-red-d);margin:0 0 6px!important}

/* listas */
.sd-check{list-style:none;padding:0;margin:18px 0}
.sd-check li{position:relative;padding:0 0 0 34px;margin:0 0 12px}
.sd-check li::before{content:"";position:absolute;left:0;top:4px;width:22px;height:22px;border-radius:7px;background:var(--sd-night) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%23FF5A33' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.sd-mini{counter-reset:sdm;list-style:none;padding:0;margin:18px 0;display:grid;gap:12px}
.sd-mini li{counter-increment:sdm;background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r-s);padding:16px 18px 16px 64px;position:relative}
.sd-mini li::before{content:counter(sdm,decimal-leading-zero);position:absolute;left:18px;top:15px;font-family:var(--sd-mono);font-weight:700;color:var(--sd-red-d);font-size:18px}

/* tabla */
.sd-tbl{overflow-x:auto;margin:20px 0;border-radius:var(--sd-r);border:1px solid var(--sd-line);background:var(--sd-card);-webkit-overflow-scrolling:touch}
.sd-tbl table{width:100%;border-collapse:collapse;min-width:560px;font-size:16px}
.sd-tbl th{background:var(--sd-night);color:#fff;text-align:left;font-weight:700;padding:13px 16px;font-size:15px}
.sd-tbl td{padding:13px 16px;border-top:1px solid var(--sd-line);vertical-align:top}
.sd-tbl td:first-child{font-weight:700}
.sd-tbl tbody tr:nth-child(even) td{background:#FAF9F6}

/* diagnóstico */
.sd-diag{display:grid;gap:14px;margin:20px 0}
.sd-diag > div{display:grid;grid-template-columns:1fr 1fr 1.2fr;background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r);overflow:hidden}
.sd-diag p{margin:0;padding:16px 18px;font-size:16px}
.sd-diag p::before{display:block;font-family:var(--sd-mono);font-size:13px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px}
.sd-d-s{background:var(--sd-night);color:#fff;font-weight:700}
.sd-d-s::before{content:"Síntoma";color:#FF8A66}
.sd-d-c::before{content:"Causa";color:var(--sd-mute)}
.sd-d-f{background:#F7FAF4}
.sd-d-f::before{content:"Solución";color:#2F7A3B}

/* glosario y comparación */
.sd-gloss{margin:18px 0;display:grid;gap:10px}
.sd-gloss > div{display:grid;grid-template-columns:200px 1fr;gap:16px;padding:14px 0;border-bottom:1px dashed var(--sd-line)}
.sd-gloss dt{font-weight:800;font-family:var(--sd-mono);color:var(--sd-night)}
.sd-gloss dd{margin:0}
.sd-duo{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0}
.sd-duo > div{background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r);padding:18px 20px}
.sd-duo > div:first-child{border-top:4px solid var(--sd-red)}
.sd-duo > div:last-child{border-top:4px solid var(--sd-night)}
.sd-duo ul{margin:0;padding-left:20px}
.sd-duo li{margin:0 0 8px}

/* figuras */
.sd-fig{margin:0 0 44px;background:linear-gradient(135deg,#E8EDF7,#FCEDE6);border-radius:var(--sd-r);padding:20px;display:flex;flex-direction:column;align-items:center}
.sd-fig img{border-radius:var(--sd-r-s);max-height:460px;width:auto}
.sd-fig figcaption{margin-top:12px;font-size:15px;color:var(--sd-mute);text-align:center}
.sd-fig--wide{padding:0;background:none}
.sd-fig--wide img{width:100%;max-height:none}

/* mapa y siguiente */
.sd-map,.sd-next-g{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:20px 0}
.sd-map a,.sd-next-g a{display:flex;flex-direction:column;gap:4px;padding:18px 20px;background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r);text-decoration:none;color:var(--sd-ink);transition:border-color .15s,transform .15s;min-height:44px}
.sd-map a:hover,.sd-next-g a:hover{border-color:var(--sd-red);transform:translateY(-2px);color:var(--sd-ink)}
.sd-c-n{font-family:var(--sd-mono);font-weight:700;color:var(--sd-red-d);font-size:15px}
.sd-map b,.sd-next-g b{font-size:18px;line-height:1.3}
.sd-map em,.sd-next-g em{font-style:normal;color:var(--sd-mute);font-size:15px;line-height:1.5}
.sd-next{margin:40px 0 0;padding-top:28px;border-top:2px solid var(--sd-line)}
.sd-next-t{margin:0;font-family:var(--sd-mono);font-weight:700;font-size:15px;text-transform:uppercase;letter-spacing:.06em;color:var(--sd-mute)}

/* preguntas */
.sd-faq-l{display:grid;gap:10px}
.sd-faq details{background:var(--sd-card);border:1px solid var(--sd-line);border-radius:var(--sd-r-s)}
.sd-faq summary{cursor:pointer;list-style:none;padding:16px 56px 16px 20px;font-weight:700;position:relative;min-height:44px}
.sd-faq summary::-webkit-details-marker{display:none}
.sd-faq summary::after{content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:var(--sd-night);color:#fff;display:grid;place-items:center;font-family:var(--sd-mono);font-size:18px}
.sd-faq details[open] summary::after{content:"–";background:var(--sd-red)}
.sd-faq details p{margin:0;padding:0 20px 18px;color:var(--sd-ink2)}

/* banda final */
.sd-band{display:flex;align-items:center;justify-content:space-between;gap:24px;background:radial-gradient(600px 240px at 100% 0,rgba(255,36,0,.28),transparent 70%),var(--sd-night);color:#fff;border-radius:24px;padding:30px 34px;margin:44px 0 0}
.sd-band p{margin:0;color:#C9D1E1}
.sd-band .sd-band-t{color:#fff;font-weight:800;font-size:23px;line-height:1.25;margin:0 0 6px}
.sd-go--band{margin:0;flex:0 0 auto;flex-direction:column;align-items:flex-end;gap:8px}
.sd-band .sd-ad{color:#97A2BA}

/* ===== pie ===== */
.foot{background:var(--sd-night);color:#AEB7CA;padding:44px 0 36px;font-size:15px}
.foot-top{display:flex;align-items:flex-start;justify-content:space-between;gap:28px;padding-bottom:22px;margin-bottom:20px;border-bottom:1px solid rgba(255,255,255,.1)}
.foot-top nav{display:flex;flex-wrap:wrap;gap:4px 8px;justify-content:flex-end;max-width:720px}
.foot-top nav a{color:#E1E6F0;text-decoration:none;padding:10px 8px;min-height:44px;display:inline-flex;align-items:center}
.foot-top nav a:hover{color:#FF8A66}
.foot p{margin:0 0 8px;max-width:80ch}
.foot p:last-child{margin-top:14px;color:#7D879D}

/* ===== responsive ===== */
@media (max-width:1020px){
  .top nav{display:none}
  .top-in{justify-content:space-between}
  .sd-grid{grid-template-columns:minmax(0,1fr);gap:28px;padding-top:24px}
  .sd-grid .sd-route{grid-column:1;grid-row:1;position:static;padding:16px}
  .sd-grid .sd-art{grid-row:2}
  .sd-route ol{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}
  .sd-route ol::before{display:none}
  .sd-route li{flex:0 0 auto}
  .sd-route li.is-here{order:-1}
  .sd-route a{background:var(--sd-night2);border-radius:999px;padding:4px 16px 4px 4px;white-space:nowrap}
  .sd-route a b{flex-basis:36px;height:36px}
  .sd-route-t{margin-bottom:10px}
}
@media (max-width:860px){
  .sd-hero--home .sd-hero-in{grid-template-columns:1fr;gap:28px;padding-top:40px;padding-bottom:84px}
  .sd-hero-fig{justify-self:center;max-width:280px}
  .sd-hero-fig figcaption{left:-12px}
  .sd-map,.sd-next-g{grid-template-columns:1fr 1fr}
  .sd-diag > div{grid-template-columns:1fr}
  .sd-band{flex-direction:column;align-items:flex-start;padding:26px 22px}
  .sd-go--band{align-items:flex-start}
  .foot-top{flex-direction:column}
  .foot-top nav{justify-content:flex-start}
}
@media (max-width:560px){
  body.sd-p{font-size:16.5px}
  .shell,.sd-wrap{padding:0 16px}
  .top-in{min-height:60px;gap:12px}
  .btn.btn-main{padding:10px 16px;font-size:15px}
  .sd-facts,.sd-duo,.sd-map,.sd-next-g{grid-template-columns:1fr}
  .sd-steps::before{left:19px}
  .sd-steps > li{gap:12px}
  .sd-n{flex-basis:40px;height:40px;font-size:17px;box-shadow:0 0 0 4px var(--sd-paper)}
  .sd-sb{padding:16px}
  .sd-gloss > div{grid-template-columns:1fr;gap:4px}
  .sd-btn{width:100%}
  .sd-hero--page{padding-top:28px}
  .sd-hero--page::before{display:none}
  .sd-sec h2{padding-left:16px}
  .sd-fig{padding:12px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}