/* Sistuku — hoja de estilo común */

:root{
  --paper:#f1f2f0;
  --paper-alt:#e3e5e2;
  --ink-block:#141614;
  --text:#171917;
  --text-soft:#6a6e6a;
  --text-invert:#f1f2f0;
  --accent:#2a6b3c;
  --accent-2:#8a6a20;
  --rhythm:76px;
  --serif:Georgia,'Times New Roman',serif;
  --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:1.72;
  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;}

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

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

.sheet{
  width:100%;
  max-width:1220px;
  margin:0 auto;
  padding:0 22px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:22px;
}

.col-main{grid-column:2 / 9;}
.col-wide{grid-column:2 / 11;}
.col-full{grid-column:2 / 13;}

/* ---------- corchete / lomo ---------- */

.spine{
  grid-column:1 / 2;
  grid-row:1 / -1;
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:11px;
  padding-top:14px;
}
.spine::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:1px;
  background:var(--text);
  opacity:.28;
}
.spine span{
  display:block;
  width:17px;
  height:2px;
  background:var(--accent);
  margin-left:-8px;
}
.spine span:nth-child(3n){background:var(--accent-2);width:11px;}

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

.masthead{
  border-bottom:1px solid rgba(23,25,23,.18);
  padding:20px 0 16px;
}
.masthead .sheet{align-items:baseline;row-gap:12px;}

.wordmark{
  grid-column:1 / 6;
  font-family:var(--serif);
  font-size:25px;
  letter-spacing:.04em;
  margin:0;
}
.wordmark a{color:var(--text);text-decoration:none;}
.wordmark a:hover{color:var(--accent);}

.mainnav{grid-column:6 / 13;}
.mainnav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px 20px;
  justify-content:flex-end;
}
.mainnav a{
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--text);
  text-decoration:none;
  padding-bottom:3px;
  border-bottom:1px solid transparent;
}
.mainnav a:hover,.mainnav a[aria-current="page"]{
  border-bottom-color:var(--accent);
  color:var(--accent);
}

/* ---------- ritmo de secciones ---------- */

.band{padding:var(--rhythm) 0;}
.band--alt{background:var(--paper-alt);}
.band--ink{background:var(--ink-block);color:var(--text-invert);}
.band--ink .colophon{color:#a9aea9;}
.band--ink .colophon::after{background:rgba(241,242,240,.3);}
.band--ink .caption{color:#a9aea9;}
.band--ink h2{color:var(--text-invert);}
.band--ink a{color:#8fc39c;}

.colophon{
  grid-column:1 / 13;
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--accent-2);
  margin:0 0 26px;
  display:block;
}
.colophon::after{
  content:"";
  display:block;
  height:1px;
  background:rgba(23,25,23,.2);
  margin-top:10px;
}

/* ---------- tipografía ---------- */

h1,h2,h3{font-family:var(--serif);font-weight:400;}

h1{
  font-size:47px;
  line-height:1.14;
  margin:0 0 20px;
  letter-spacing:-.01em;
}

h2{
  font-size:30px;
  line-height:1.24;
  margin:0 0 16px;
}

h3{
  font-family:var(--serif);
  font-style:italic;
  font-size:21px;
  line-height:1.35;
  margin:34px 0 10px;
}

p{margin:0 0 20px;}

.lede{
  font-size:20px;
  line-height:1.62;
  color:#303430;
}

.rule-double{
  border:0;
  height:4px;
  border-top:1px solid var(--text);
  border-bottom:1px solid var(--text);
  margin:0 0 24px;
  max-width:360px;
}

.caption{
  font-family:var(--sans);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.55;
  color:var(--text-soft);
  margin:10px 0 0;
}
.caption b{color:var(--accent-2);font-weight:600;letter-spacing:.14em;text-transform:uppercase;}

.divider{
  grid-column:2 / 13;
  display:flex;
  justify-content:center;
  gap:9px;
  margin:54px 0;
}
.divider i{display:block;width:16px;height:2px;background:var(--accent);}
.divider i:nth-child(2){background:var(--accent-2);}

/* ---------- portada ---------- */

.hero{padding:62px 0 var(--rhythm);}
.hero .sheet{row-gap:0;}
.hero-text{grid-column:2 / 9;}
.hero .lede{grid-column:2 / 9;max-width:none;}

.figure-main{
  grid-column:7 / 13;
  margin:34px 0 0;
}
.figure-main img{width:100%;}

.hero-meta{
  grid-column:2 / 7;
  align-self:end;
  margin-top:34px;
  font-size:14px;
  line-height:1.7;
  color:var(--text-soft);
}

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

ul.marks,ol.steps{
  margin:0 0 22px;
  padding:0;
  list-style:none;
}
ul.marks li{
  position:relative;
  padding-left:26px;
  margin-bottom:10px;
}
ul.marks li::before{
  content:"";
  position:absolute;
  left:0;
  top:13px;
  width:14px;
  height:2px;
  background:var(--accent);
}
ol.steps{counter-reset:s;}
ol.steps li{
  position:relative;
  padding-left:38px;
  margin-bottom:14px;
  counter-increment:s;
}
ol.steps li::before{
  content:counter(s,decimal-leading-zero);
  position:absolute;
  left:0;
  top:1px;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--accent-2);
  font-variant-numeric:tabular-nums;
}

.band--ink ul.marks li::before{background:#8fc39c;}

/* ---------- bloque oscuro con imagen vertical ---------- */

.detail-grid{row-gap:30px;}
.figure-detail{
  grid-column:2 / 6;
  margin:0;
}
.figure-detail img{width:100%;}
.detail-text{grid-column:7 / 13;}

/* ---------- tabla de referencia ---------- */

.specs{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
  margin:0 0 20px;
}
.specs caption{
  text-align:left;
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent-2);
  padding-bottom:10px;
}
.specs th,.specs td{
  text-align:left;
  padding:9px 12px 9px 0;
  border-bottom:1px solid rgba(23,25,23,.16);
  vertical-align:top;
}
.specs th{font-weight:600;font-size:13px;letter-spacing:.04em;}
.band--ink .specs th,.band--ink .specs td{border-bottom-color:rgba(241,242,240,.22);}

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

.page-head{padding:56px 0 8px;}
.page-head h1{grid-column:2 / 10;font-size:40px;}
.page-head .lede{grid-column:2 / 10;}

.prose{grid-column:2 / 9;}
.prose h2{margin-top:6px;}

.dropcap::first-letter{
  float:left;
  font-family:var(--serif);
  font-size:66px;
  line-height:.82;
  padding:6px 12px 0 0;
  color:var(--accent);
}

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

.pagefoot{
  background:var(--paper-alt);
  border-top:1px solid rgba(23,25,23,.2);
  padding:52px 0 44px;
  margin-top:0;
}
.pagefoot .sheet{display:block;text-align:center;}
.foot-name{
  font-family:var(--serif);
  font-size:22px;
  letter-spacing:.05em;
  margin:0 0 16px;
}
.footnav ul{
  list-style:none;
  margin:0 0 18px;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:8px 0;
}
.footnav li{padding:0 14px;border-right:1px solid rgba(23,25,23,.3);}
.footnav li:last-child{border-right:0;}
.footnav a{
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--text);
  text-decoration:none;
}
.footnav a:hover{color:var(--accent);text-decoration:underline;}
.foot-mail{margin:0 0 12px;font-size:15px;}
.foot-note{
  margin:0 auto;
  max-width:620px;
  font-size:12px;
  line-height:1.65;
  color:var(--text-soft);
}

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

@media (max-width:980px){
  h1{font-size:38px;}
  .page-head h1{font-size:33px;}
  h2{font-size:26px;}
  .hero-text,.hero .lede,.col-main,.col-wide,.col-full,.prose,
  .page-head h1,.page-head .lede{grid-column:2 / 13;}
  .figure-main{grid-column:2 / 13;}
  .hero-meta{grid-column:2 / 13;}
  .figure-detail{grid-column:2 / 9;}
  .detail-text{grid-column:2 / 13;}
  .divider{grid-column:2 / 13;}
}

@media (max-width:700px){
  :root{--rhythm:46px;}
  body{font-size:16px;}
  h1{font-size:31px;}
  .page-head h1{font-size:28px;}
  h2{font-size:23px;}
  h3{font-size:19px;}
  .lede{font-size:18px;}
  .sheet{
    grid-template-columns:14px repeat(11,1fr);
    padding:0 16px;
    column-gap:10px;
  }
  .masthead .sheet{grid-template-columns:1fr;}
  .wordmark,.mainnav{grid-column:1 / -1;}
  .mainnav ul{justify-content:flex-start;gap:6px 16px;}
  .hero{padding:36px 0 var(--rhythm);}
  .spine{gap:8px;}
  .figure-detail{grid-column:2 / 13;}
  .divider{margin:38px 0;}
  .specs{font-size:14px;}
  .footnav li{padding:0 10px;}
}