/* Gutetro — hoja de estilo única */

:root{
  --paper:#f5f0df;
  --paper-alt:#e9e1c9;
  --ink-dark:#2f2a1e;
  --text:#241f16;
  --text-soft:#736b55;
  --accent:#8a6a1f;
  --accent-2:#4a6b52;
  --rhythm:76px;
  --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(--paper);
  color:var(--text);
  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-underline-offset:3px;text-decoration-thickness:1px;}
a:hover{text-decoration:none;}
a:focus-visible,
*:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

/* ---------- rejilla de 12 columnas ---------- */

.sheet{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 22px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:22px;
}

.col-text{grid-column:2 / 8;}
.col-wide{grid-column:2 / 10;}
.col-full{grid-column:2 / 13;}
.col-img{grid-column:7 / 13;}
.col-mark{grid-column:1 / 2;}

/* ---------- cabecera y navegación ---------- */

.topbar{
  border-bottom:1px solid rgba(36,31,22,.22);
  background:var(--paper);
}
.topbar .sheet{
  align-items:center;
  padding-top:16px;
  padding-bottom:16px;
}
.brand{
  grid-column:1 / 5;
  font-family:var(--mono);
  text-transform:uppercase;
  letter-spacing:.24em;
  font-size:15px;
  font-weight:700;
  color:var(--text);
  text-decoration:none;
}
.brand span{color:var(--accent-2);}
.nav{grid-column:5 / 13;}
.nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:6px 20px;
}
.nav a{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--text);
  text-decoration:none;
  padding:4px 0;
  border-bottom:1px solid transparent;
}
.nav a:hover,
.nav a[aria-current="page"]{
  border-bottom-color:var(--accent);
  color:var(--accent);
}

/* ---------- lomo cosido ---------- */

.spine{
  grid-column:1 / 2;
  position:relative;
  min-height:100%;
}
.spine::before{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  bottom:6px;
  width:1px;
  background:rgba(36,31,22,.3);
}
.stitch{
  position:absolute;
  left:-5px;
  top:14px;
  bottom:14px;
  width:12px;
  background-image:repeating-linear-gradient(
    to bottom,
    var(--accent) 0,
    var(--accent) 2px,
    transparent 2px,
    transparent 16px
  );
}

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

.hero{padding:calc(var(--rhythm) * .9) 0 var(--rhythm);}
.hero .sheet{row-gap:0;}
.hero-body{grid-column:2 / 10;}
.folio{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--accent-2);
  margin:0 0 14px;
}
h1{
  font-family:var(--mono);
  text-transform:uppercase;
  letter-spacing:.05em;
  font-weight:700;
  font-size:clamp(26px,4.4vw,44px);
  line-height:1.22;
  margin:0 0 20px;
  max-width:16ch;
}
.rule-double{
  border:0;
  border-top:1px solid var(--text);
  height:4px;
  border-bottom:1px solid rgba(36,31,22,.35);
  margin:0 0 22px;
  max-width:520px;
}
.lead{
  grid-column:2 / 10;
  font-size:19.5px;
  line-height:1.7;
  margin:0;
}
.hero-figure{
  grid-column:7 / 13;
  margin:44px 0 0;
}
.hero-figure img{width:100%;}
figure{margin:0;}
figcaption{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-soft);
  margin-top:10px;
  text-align:left;
  line-height:1.6;
}

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

.band{padding:var(--rhythm) 0;}
.band--alt{background:var(--paper-alt);}
.band--dark{
  background:var(--ink-dark);
  color:var(--paper);
}
.band--dark h2,
.band--dark h3{color:var(--paper);}
.band--dark .running{color:#c8bd9c;}
.band--dark .running::after{background:rgba(245,240,223,.3);}
.band--dark figcaption{color:#c8bd9c;}
.band--dark a{color:#d8b45f;}
.band--dark .list-checks li::before{background:#d8b45f;}
.band--dark .rule-thin{background:rgba(245,240,223,.28);}

.running{
  grid-column:1 / 13;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--accent-2);
  margin:0 0 26px;
}
.running::after{
  content:"";
  display:block;
  height:1px;
  background:rgba(36,31,22,.28);
  margin-top:8px;
}

h2{
  font-family:var(--mono);
  text-transform:uppercase;
  letter-spacing:.08em;
  font-size:clamp(19px,2.3vw,25px);
  line-height:1.35;
  font-weight:700;
  margin:0 0 18px;
}
h3{
  font-family:var(--mono);
  text-transform:uppercase;
  letter-spacing:.13em;
  font-size:13.5px;
  font-weight:700;
  color:var(--accent);
  margin:34px 0 10px;
}
p{margin:0 0 18px;}
p:last-child{margin-bottom:0;}

.intro{
  font-size:19.5px;
  line-height:1.7;
}

/* listas */

ul.list-checks,
ol.list-steps{
  margin:0 0 18px;
  padding:0;
  list-style:none;
}
ul.list-checks li{
  position:relative;
  padding-left:24px;
  margin-bottom:11px;
}
ul.list-checks li::before{
  content:"";
  position:absolute;
  left:0;
  top:12px;
  width:12px;
  height:2px;
  background:var(--accent);
}
ol.list-steps{counter-reset:step;}
ol.list-steps li{
  position:relative;
  padding-left:44px;
  margin-bottom:14px;
  counter-increment:step;
}
ol.list-steps li::before{
  content:counter(step,decimal-leading-zero);
  position:absolute;
  left:0;
  top:2px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--accent-2);
}

.rule-thin{
  height:1px;
  background:rgba(36,31,22,.22);
  border:0;
  margin:30px 0;
}

/* separador tipográfico */

.tri{
  grid-column:1 / 13;
  display:flex;
  justify-content:center;
  gap:9px;
  padding:calc(var(--rhythm) * .55) 0 0;
}
.tri span{
  width:16px;
  height:2px;
  background:var(--accent);
  display:block;
}

/* bloque de detalle en sección oscura */

.detail-grid{row-gap:34px;}
.detail-figure{grid-column:2 / 6;}
.detail-figure img{width:100%;}
.detail-text{grid-column:7 / 13;}

/* buzón de contacto */

.contact-box{
  grid-column:2 / 9;
  border-left:2px solid var(--accent);
  padding:4px 0 4px 20px;
}
.mail{
  font-family:var(--mono);
  font-size:16px;
  letter-spacing:.04em;
  word-break:break-word;
}

/* capitular en About */

.dropcap::first-letter{
  float:left;
  font-family:var(--mono);
  font-size:56px;
  line-height:.86;
  font-weight:700;
  color:var(--accent);
  padding:6px 12px 0 0;
}

/* pie de página */

.site-footer{
  background:var(--paper-alt);
  border-top:1px solid rgba(36,31,22,.25);
  padding:calc(var(--rhythm) * .7) 0;
  text-align:center;
}
.site-footer .sheet{display:block;}
.footer-name{
  font-family:var(--mono);
  text-transform:uppercase;
  letter-spacing:.28em;
  font-size:14px;
  font-weight:700;
  margin:0 0 16px;
}
.footer-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:6px 0;
  margin:0 0 16px;
  padding:0;
}
.footer-nav li + li{border-left:1px solid rgba(36,31,22,.35);}
.footer-nav li{padding:0 14px;line-height:1.2;}
.footer-nav a{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--text);
  text-decoration:none;
}
.footer-nav a:hover{color:var(--accent);text-decoration:underline;}
.footer-mail{margin:0 0 10px;font-family:var(--mono);font-size:13.5px;}
.footer-note{
  margin:0 auto;
  max-width:60ch;
  font-size:13.5px;
  line-height:1.7;
  color:var(--text-soft);
}

/* ---------- páginas interiores ---------- */

.page-head{padding:calc(var(--rhythm) * .8) 0 calc(var(--rhythm) * .5);}
.page-head .rule-double{margin-bottom:18px;}
.doc{padding:0 0 var(--rhythm);}
.doc h2{margin-top:38px;}
.doc h2:first-of-type{margin-top:0;}

/* ---------- responsive ---------- */

@media (max-width:900px){
  :root{--rhythm:56px;}
  .col-text,.col-wide,.col-full,.hero-body,.lead,
  .detail-text,.contact-box{grid-column:2 / 13;}
  .hero-figure{grid-column:2 / 13;}
  .detail-figure{grid-column:2 / 10;}
  .nav ul{justify-content:flex-start;}
  .brand{grid-column:1 / 13;margin-bottom:10px;}
  .nav{grid-column:1 / 13;}
}

@media (max-width:640px){
  :root{--rhythm:46px;}
  body{font-size:16.5px;}
  .sheet{
    grid-template-columns:14px repeat(11,1fr);
    column-gap:10px;
    padding:0 16px;
  }
  .col-text,.col-wide,.col-full,.hero-body,.lead,
  .hero-figure,.detail-figure,.detail-text,.contact-box{grid-column:2 / 13;}
  .running,.tri{grid-column:1 / 13;}
  .brand{grid-column:1 / 13;letter-spacing:.18em;}
  .nav{grid-column:1 / 13;}
  .nav ul{gap:6px 14px;}
  .lead,.intro{font-size:17.5px;}
  .footer-nav ul{flex-direction:column;}
  .footer-nav li + li{border-left:0;}
  .footer-nav li{padding:5px 0;}
  .dropcap::first-letter{font-size:44px;}
}