/* Tenasta — hoja de estilos general */

:root{
  --bg:#eceff1;
  --bg-alt:#dde3e7;
  --bg-dark:#1f2a33;
  --ink:#151c22;
  --muted:#606d78;
  --on-dark:#eceff1;
  --accent:#a2472c;
  --accent2:#3f6b86;
  --step:84px;
  --gut:24px;
  --mono:ui-monospace,Consolas,'Liberation Mono',monospace;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

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

html{-webkit-text-size-adjust:100%;}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block;}

a{color:var(--accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
a:hover{text-decoration-thickness:2px;}

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

/* ---------- rejilla ---------- */

.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 var(--gut);
}

.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:var(--gut);
}

/* columnas de texto: 7 columnas, desplazamiento progresivo */
.c1{grid-column:1 / span 7;}
.c2{grid-column:2 / span 7;}
.c3{grid-column:3 / span 7;}
.c4{grid-column:4 / span 7;}

/* ---------- marcas de registro ---------- */

.mark{
  position:relative;
  display:block;
  width:18px;
  height:18px;
  flex:0 0 18px;
}
.mark::before,
.mark::after{
  content:"";
  position:absolute;
  background:var(--accent2);
}
.mark::before{left:0;right:0;top:8px;height:1px;}
.mark::after{top:0;bottom:0;left:8px;width:1px;}
.mark-a::before,.mark-a::after{background:var(--accent);}
.mark-on-dark::before,.mark-on-dark::after{background:#7d94a4;}

/* ---------- cabecera ---------- */

.site-header{
  border-bottom:1px solid #c8d1d7;
  background:var(--bg);
}
.site-header .wrap{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:12px 32px;
  padding-top:20px;
  padding-bottom:20px;
}
.brand{
  font-family:var(--mono);
  font-size:15px;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--ink);
  text-decoration:none;
  font-weight:600;
}
.brand:hover{color:var(--accent);}

.site-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px 22px;
}
.site-nav a{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
  text-decoration:none;
  padding:2px 0;
  border-bottom:2px solid transparent;
}
.site-nav a:hover,
.site-nav a[aria-current="page"]{
  color:var(--ink);
  border-bottom-color:var(--accent);
}

/* ---------- secciones ---------- */

.band{padding:var(--step) 0;}
.band-alt{background:var(--bg-alt);}
.band-dark{background:var(--bg-dark);color:var(--on-dark);}
.band-dark .kicker{color:#8fa8b8;}
.band-dark .caption{color:#9fb2be;}
.band-dark a{color:#e0a892;}

.sep{
  position:relative;
  height:8px;
  margin-bottom:34px;
  max-width:520px;
}
.sep::before,
.sep::after{
  content:"";
  position:absolute;
  height:2px;
  left:0;
  right:0;
}
.sep::before{top:0;background:var(--accent);}
.sep::after{top:6px;left:24px;background:var(--accent2);}
.band-dark .sep::before{background:#c4643f;}
.band-dark .sep::after{background:#5f8aa6;}

.kicker{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--accent2);
  margin:0 0 12px;
}

h1,h2,h3{
  font-family:var(--mono);
  text-transform:uppercase;
  font-weight:600;
  color:inherit;
}

h1{
  font-size:clamp(26px,4.4vw,46px);
  line-height:1.18;
  letter-spacing:.055em;
  margin:0;
}
h2{
  font-size:clamp(18px,2.3vw,25px);
  line-height:1.3;
  letter-spacing:.09em;
  margin:0 0 22px;
}
h3{
  font-size:15px;
  line-height:1.45;
  letter-spacing:.11em;
  margin:34px 0 12px;
}

p{margin:0 0 20px;}
p:last-child{margin-bottom:0;}

.lead{font-size:19px;line-height:1.7;}

.caption{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
  line-height:1.6;
  margin:14px 0 0;
}

/* ---------- hero ---------- */

.hero{
  position:relative;
  padding:64px 0 var(--step);
}
.hero-frame{
  position:relative;
  padding:34px 0 8px;
}
.hero-corner{position:absolute;}
.hero-corner.tl{top:0;left:-6px;}
.hero-corner.tr{top:0;right:-6px;}
.hero-corner.bl{bottom:0;left:-6px;}
.hero-corner.br{bottom:0;right:-6px;}
.hero-frame::before{
  content:"";
  position:absolute;
  top:8px;
  left:12px;
  right:12px;
  height:1px;
  background:#c1ccd3;
}
.hero-frame::after{
  content:"";
  position:absolute;
  bottom:8px;
  left:12px;
  right:12px;
  height:1px;
  background:#c1ccd3;
}

.hero h1{grid-column:1 / span 9;}
.hero h1 .l2{
  position:relative;
  display:inline-block;
}
.hero h1 .l2::after{
  content:"";
  position:absolute;
  left:-4px;
  right:-10px;
  bottom:.06em;
  height:2px;
  background:var(--accent);
}

.hero-body{margin-top:44px;}
.hero-intro{grid-column:1 / span 5;}
.hero-topics{grid-column:8 / span 4;}

.topics{
  list-style:none;
  margin:0;
  padding:0;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  line-height:1.5;
  color:var(--muted);
}
.topics li{
  position:relative;
  padding-left:18px;
  margin-bottom:11px;
}
.topics li::before{
  content:"";
  position:absolute;
  left:0;
  top:.5em;
  width:7px;
  height:7px;
  background:var(--accent);
}

/* ---------- imagen principal ---------- */

.figure-main{
  grid-column:3 / span 8;
  margin:0;
  position:relative;
}
.figure-main .frame{position:relative;}
.figure-main .hero-corner{z-index:2;}
.figure-main .hero-corner.tl{top:-9px;left:-9px;}
.figure-main .hero-corner.tr{top:-9px;right:-9px;}
.figure-main .hero-corner.bl{bottom:-9px;left:-9px;}
.figure-main .hero-corner.br{bottom:-9px;right:-9px;}
.figure-main figcaption{max-width:420px;}

/* ---------- listas prácticas ---------- */

.check{
  list-style:none;
  margin:0 0 20px;
  padding:0;
}
.check li{
  position:relative;
  padding-left:26px;
  margin-bottom:10px;
}
.check li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:9px;
  height:9px;
  border:2px solid var(--accent);
}
.band-dark .check li::before{border-color:#c4643f;}

ol.steps{
  margin:0 0 20px;
  padding-left:0;
  list-style:none;
  counter-reset:st;
}
ol.steps li{
  position:relative;
  padding-left:44px;
  margin-bottom:14px;
  counter-increment:st;
}
ol.steps li::before{
  content:counter(st,decimal-leading-zero);
  position:absolute;
  left:0;
  top:.12em;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--accent2);
}
.band-dark ol.steps li::before{color:#8fa8b8;}

/* ---------- bloque oscuro con imagen de detalle ---------- */

.detail-figure{
  grid-column:2 / span 4;
  margin:0;
}
.detail-text{grid-column:7 / span 6;}

/* ---------- página interior / about ---------- */

.page-head{padding:60px 0 0;}
.page-head h1{grid-column:1 / span 9;}
.page-head .kicker{grid-column:1 / span 12;}

.about-rail{grid-column:1 / span 1;padding-top:10px;}
.about-rail .mark{margin-bottom:120px;}
.about-body{grid-column:3 / span 7;}

.prose h2{margin-top:0;}
.prose section + section{margin-top:var(--step);}

/* ---------- contacto ---------- */

.contact-line{
  font-family:var(--mono);
  font-size:14px;
  letter-spacing:.1em;
  margin:0 0 8px;
}

/* ---------- pie ---------- */

.site-footer{
  background:var(--bg-dark);
  color:var(--on-dark);
  padding:56px 0 44px;
}
.site-footer .sep{margin-bottom:32px;max-width:100%;}
.site-footer .sep::before{background:#c4643f;}
.site-footer .sep::after{background:#5f8aa6;}
.footer-main{grid-column:1 / span 7;}
.footer-side{grid-column:9 / span 4;}
.footer-name{
  font-family:var(--mono);
  font-size:15px;
  letter-spacing:.34em;
  text-transform:uppercase;
  margin:0 0 14px;
  font-weight:600;
}
.footer-note{color:#a9bcc7;font-size:15px;margin:0;max-width:46ch;}
.footer-nav ul{list-style:none;margin:0 0 18px;padding:0;}
.footer-nav li{margin-bottom:9px;}
.footer-nav a{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--on-dark);
  text-decoration:none;
  border-bottom:1px solid transparent;
}
.footer-nav a:hover{border-bottom-color:#c4643f;}
.footer-mail{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.06em;
  margin:0;
}
.footer-mail a{color:#e0a892;}
.footer-legal{
  grid-column:1 / span 12;
  margin-top:46px;
  padding-top:18px;
  border-top:1px solid #35434e;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:#8496a3;
}

/* ---------- adaptación ---------- */

@media (max-width:1000px){
  :root{--step:64px;}
  .c1,.c2,.c3,.c4{grid-column:1 / span 10;}
  .hero h1{grid-column:1 / span 11;}
  .hero-intro{grid-column:1 / span 7;}
  .hero-topics{grid-column:8 / span 5;}
  .figure-main{grid-column:1 / span 11;}
  .detail-figure{grid-column:1 / span 5;}
  .detail-text{grid-column:7 / span 6;}
  .about-body{grid-column:2 / span 10;}
  .footer-main{grid-column:1 / span 7;}
  .footer-side{grid-column:8 / span 5;}
  .page-head h1{grid-column:1 / span 11;}
}

@media (max-width:720px){
  :root{--step:50px;--gut:18px;}
  body{font-size:16px;line-height:1.72;}
  .lead{font-size:17px;}
  .site-header .wrap{flex-direction:column;align-items:flex-start;}
  .site-nav ul{gap:6px 16px;}
  .hero{padding-top:40px;}
  .hero-body{margin-top:32px;}
  .grid > *{grid-column:1 / span 12 !important;}
  .hero-topics{margin-top:30px;}
  .about-rail{display:none;}
  .detail-text{margin-top:28px;}
  .footer-side{margin-top:34px;}
  .sep{max-width:100%;}
  .hero-corner.tl,.hero-corner.bl{left:-2px;}
  .hero-corner.tr,.hero-corner.br{right:-2px;}
  .figure-main .hero-corner.tl,.figure-main .hero-corner.bl{left:-7px;}
  .figure-main .hero-corner.tr,.figure-main .hero-corner.br{right:-7px;}
  ol.steps li{padding-left:36px;}
}