/* ============================================================
   TRAMIVIAL — Sistema de diseño
   Lenguaje visual: señalética vial mexicana + colores de engomado
   Paleta: papel claro, tinta profunda, verde carretera como primario,
   engomados (amarillo/rosa/rojo/verde/azul) como sistema de acentos.
   ============================================================ */

:root{
  --paper:#F8F9F6;
  --card:#FFFFFF;
  --ink:#17211C;
  --ink-soft:#4A564F;
  --line:#E3E7E1;
  --road:#0E7A4E;          /* verde señalética carretera */
  --road-dark:#0A5C3B;
  --road-tint:#E7F3EC;
  --eng-amarillo:#F5C543;
  --eng-rosa:#F08CA4;
  --eng-rojo:#E4614E;
  --eng-verde:#58B368;
  --eng-azul:#4A7FE0;
  --radius:14px;
  --shadow:0 1px 2px rgba(23,33,28,.05),0 8px 24px -12px rgba(23,33,28,.12);
  --maxw:1080px;
  --maxw-article:760px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.7;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.display{font-family:'Archivo',system-ui,sans-serif;line-height:1.15;letter-spacing:-.01em}
a{color:var(--road);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,select:focus-visible{outline:3px solid var(--eng-azul);outline-offset:2px;border-radius:4px}
img{max-width:100%;display:block}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.wrap-article{max-width:var(--maxw-article);margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
.site-header{
  background:var(--card);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:50;
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:14px 20px;
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
}
.logo{display:flex;align-items:center;gap:10px;font-family:'Archivo';font-weight:800;font-size:1.25rem;color:var(--ink)}
.logo:hover{text-decoration:none}
.logo-badge{
  background:var(--road);color:#fff;border-radius:8px;
  padding:4px 9px;font-size:.95rem;letter-spacing:.02em;
  border:2px solid var(--road-dark);
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.15);
}
.main-nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.main-nav a{
  padding:8px 13px;border-radius:9px;color:var(--ink-soft);
  font-weight:600;font-size:.92rem;
}
.main-nav a:hover{background:var(--road-tint);color:var(--road-dark);text-decoration:none}
.main-nav a.active{background:var(--road);color:#fff}

/* ---------- Placa chip (motivo de UI) ---------- */
.placa{
  display:inline-flex;align-items:center;gap:6px;
  font-family:'Archivo';font-weight:800;letter-spacing:.08em;
  background:#fff;border:2px solid var(--ink);border-radius:7px;
  padding:2px 10px;font-size:.85rem;
  box-shadow:inset 0 0 0 2px #fff,inset 0 0 0 3.5px var(--line);
}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(160deg,var(--road) 0%,var(--road-dark) 100%);
  color:#fff;padding:56px 0 64px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:10px;
  background:repeating-linear-gradient(90deg,#fff 0 42px,transparent 42px 84px);
  opacity:.8;
}
.hero h1{font-size:clamp(1.9rem,4.5vw,3rem);font-weight:800;max-width:640px;margin-bottom:16px}
.hero p{max-width:560px;font-size:1.08rem;opacity:.92;margin-bottom:28px}
.hero .eyebrow{
  display:inline-block;background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.3);border-radius:99px;
  padding:5px 14px;font-size:.82rem;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;margin-bottom:18px;
}

/* ---------- Botones ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:'Archivo';font-weight:700;font-size:1rem;
  padding:13px 24px;border-radius:11px;border:none;cursor:pointer;
  transition:transform .12s ease,box-shadow .12s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-white{background:#fff;color:var(--road-dark);box-shadow:0 3px 0 rgba(0,0,0,.18)}
.btn-road{background:var(--road);color:#fff;box-shadow:0 3px 0 var(--road-dark)}

/* ---------- Widget verificación ---------- */
.widget{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;
}
.widget h3{font-size:1.15rem;margin-bottom:6px}
.widget .sub{color:var(--ink-soft);font-size:.92rem;margin-bottom:18px}
.digit-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-bottom:16px}
.digit-btn{
  font-family:'Archivo';font-weight:800;font-size:1.25rem;
  background:#fff;border:2px solid var(--line);border-radius:10px;
  padding:12px 0;cursor:pointer;color:var(--ink);
  transition:border-color .12s,background .12s;
}
.digit-btn:hover{border-color:var(--road)}
.digit-btn.sel{border-color:var(--road);background:var(--road-tint)}
.widget-result{
  display:none;border-radius:11px;padding:16px 18px;margin-top:4px;
  border:2px solid var(--line);align-items:center;gap:14px;
}
.widget-result.show{display:flex}
.eng-dot{width:44px;height:44px;border-radius:50%;flex-shrink:0;border:3px solid rgba(0,0,0,.12)}
.widget-result strong{font-family:'Archivo';font-size:1.05rem;display:block}
.widget-result span{color:var(--ink-soft);font-size:.92rem}

/* ---------- Secciones ---------- */
.section{padding:56px 0}
.section-head{margin-bottom:30px}
.section-head h2{font-size:1.7rem;font-weight:800;margin-bottom:8px}
.section-head p{color:var(--ink-soft);max-width:560px}
.kicker{
  color:var(--road);font-weight:800;font-size:.8rem;text-transform:uppercase;
  letter-spacing:.09em;margin-bottom:8px;display:block;font-family:'Archivo';
}

/* ---------- Cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.tcard{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px;
  transition:transform .14s ease;position:relative;overflow:hidden;
}
.tcard:hover{transform:translateY(-3px)}
.tcard::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:var(--tc,var(--road))}
.tcard h3{font-size:1.12rem}
.tcard p{color:var(--ink-soft);font-size:.94rem;flex:1}
.tcard a.cta{font-weight:700;font-size:.92rem}
.tcard .icon{font-size:1.7rem;line-height:1}

/* ---------- Artículo ---------- */
.article-hero{background:var(--card);border-bottom:1px solid var(--line);padding:44px 0 36px}
.breadcrumb{font-size:.85rem;color:var(--ink-soft);margin-bottom:16px}
.breadcrumb a{color:var(--ink-soft)}
.article-hero h1{font-size:clamp(1.7rem,4vw,2.5rem);font-weight:800;max-width:800px;margin-bottom:14px}
.article-meta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;font-size:.86rem;color:var(--ink-soft)}
.updated-badge{
  background:var(--road-tint);color:var(--road-dark);font-weight:700;
  border-radius:99px;padding:4px 13px;border:1px solid #C9E4D5;
}
.article-body{padding:40px 0 60px}
.article-body h2{font-size:1.5rem;margin:42px 0 14px;padding-top:8px}
.article-body h3{font-size:1.18rem;margin:30px 0 10px}
.article-body p{margin-bottom:16px}
.article-body ul,.article-body ol{margin:0 0 18px 24px}
.article-body li{margin-bottom:8px}

.keybox{
  background:var(--road-tint);border:1px solid #C9E4D5;border-left:5px solid var(--road);
  border-radius:11px;padding:18px 20px;margin:22px 0;
}
.keybox strong{color:var(--road-dark)}
.warnbox{
  background:#FDF3E3;border:1px solid #F1DDB6;border-left:5px solid var(--eng-amarillo);
  border-radius:11px;padding:18px 20px;margin:22px 0;
}
.databox{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:22px;margin:24px 0;
}
.databox .big{font-family:'Archivo';font-weight:800;font-size:2rem;color:var(--road-dark)}
.databox .lbl{font-size:.85rem;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.05em;font-weight:700}

table{width:100%;border-collapse:collapse;margin:22px 0;background:var(--card);border-radius:11px;overflow:hidden;box-shadow:var(--shadow);font-size:.95rem}
th{background:var(--ink);color:#fff;text-align:left;padding:12px 14px;font-family:'Archivo';font-weight:700;font-size:.88rem}
td{padding:11px 14px;border-bottom:1px solid var(--line)}
tr:last-child td{border-bottom:none}
tr:nth-child(even) td{background:#FBFCFA}

.steps{counter-reset:step;list-style:none;margin:22px 0!important}
.steps li{
  counter-increment:step;position:relative;padding:0 0 22px 52px;margin:0!important;
}
.steps li::before{
  content:counter(step);position:absolute;left:0;top:0;
  width:34px;height:34px;border-radius:50%;background:var(--road);color:#fff;
  font-family:'Archivo';font-weight:800;display:flex;align-items:center;justify-content:center;
}
.steps li:not(:last-child)::after{
  content:"";position:absolute;left:16px;top:38px;bottom:2px;width:2px;background:var(--line);
}
.steps li strong{display:block;margin-bottom:3px}

/* ---------- FAQ ---------- */
details.faq{
  background:var(--card);border:1px solid var(--line);border-radius:11px;
  margin-bottom:10px;overflow:hidden;
}
details.faq summary{
  cursor:pointer;padding:16px 20px;font-weight:700;font-family:'Archivo';
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-size:1.3rem;color:var(--road);flex-shrink:0}
details.faq[open] summary::after{content:"–"}
details.faq .faq-a{padding:0 20px 18px;color:var(--ink-soft)}

/* ---------- Slots de anuncio ---------- */
.ad-slot{
  margin:30px auto;max-width:var(--maxw-article);
}
.ad-slot.tall{}

/* ---------- Enlaces relacionados ---------- */
.related{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:34px 0}
.related h3{margin-bottom:14px;font-size:1.1rem}
.related ul{list-style:none;margin:0}
.related li{padding:9px 0;border-bottom:1px solid var(--line);margin:0}
.related li:last-child{border-bottom:none}
.related a{font-weight:600}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#B8C2BB;padding:44px 0 30px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:28px;margin-bottom:30px}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:12px}
.site-footer a{color:#B8C2BB;font-size:.9rem;display:block;padding:3px 0}
.site-footer a:hover{color:#fff}
.footer-note{border-top:1px solid #2A362F;padding-top:20px;font-size:.82rem;line-height:1.6}

@media(max-width:640px){
  .main-nav{width:100%;overflow-x:auto;padding-bottom:4px}
  .hero{padding:40px 0 48px}
  .digit-grid{grid-template-columns:repeat(5,1fr)}
  body{font-size:16px}
}

/* ---------- Buscador interno ---------- */
.search-wrap{position:relative;margin-left:auto;flex:1;max-width:280px;min-width:170px}
.search-wrap input{
  width:100%;padding:9px 14px 9px 36px;border:2px solid var(--line);border-radius:99px;
  font-family:'Inter';font-size:.9rem;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='15' height='15' viewBox='0 0 24 24' fill='none' stroke='%234A564F' stroke-width='2.4'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E") 13px center no-repeat;
}
.search-wrap input:focus{border-color:var(--road);outline:none}
.search-results{
  display:none;position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:60;
  background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);
  max-height:340px;overflow-y:auto;padding:6px;
}
.search-results.show{display:block}
.search-results a{display:block;padding:10px 12px;border-radius:8px;color:var(--ink);font-size:.9rem;line-height:1.4}
.search-results a:hover{background:var(--road-tint);text-decoration:none}
.search-results a strong{display:block;font-family:'Archivo';font-size:.92rem}
.search-results a span{color:var(--ink-soft);font-size:.8rem}
.search-results .no-res{padding:12px;color:var(--ink-soft);font-size:.88rem}

/* ---------- Índice automático (TOC) ---------- */
.toc{
  background:var(--card);border:1px solid var(--line);border-left:5px solid var(--road);
  border-radius:11px;padding:18px 22px;margin:26px 0;
}
.toc h2{font-size:1rem!important;margin:0 0 10px!important;padding:0!important}
.toc ol{margin:0 0 0 18px;font-size:.93rem}
.toc li{margin-bottom:6px}
.toc a{font-weight:600}

/* ---------- Botón volver arriba ---------- */
#topBtn{
  position:fixed;right:18px;bottom:18px;z-index:70;
  width:46px;height:46px;border-radius:50%;border:none;cursor:pointer;
  background:var(--road);color:#fff;font-size:1.3rem;font-family:'Archivo';font-weight:800;
  box-shadow:0 4px 14px rgba(14,122,78,.4);opacity:0;pointer-events:none;
  transition:opacity .2s ease;
}
#topBtn.show{opacity:1;pointer-events:auto}
#topBtn:hover{background:var(--road-dark)}

@media(max-width:760px){
  .search-wrap{order:3;max-width:100%;flex-basis:100%}
}