/* Skerdoboldo — hoja de estilos común */

:root{
  --bg:#f4f5f7;
  --bg-alt:#ffffff;
  --dark:#23262b;
  --ink:#16181d;
  --muted:#656b75;
  --blue:#2d5bd6;
  --gold:#c9a00f;
  --rule:#d9dce1;
  --rule-dark:#3a3e45;
  --serif:Georgia,'Times New Roman',serif;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

*{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:1.8;
  overflow-x:hidden;
}

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

a{color:var(--blue);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
a:hover{text-decoration-thickness:2px;}
a:focus-visible{outline:2px solid var(--blue);outline-offset:3px;}

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

.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 24px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:26px;
}

.wrap.flex{display:flex;align-items:baseline;justify-content:space-between;gap:18px;flex-wrap:wrap;}

/* la primera columna queda para el lomo y los ladillos */
.col-text{grid-column:2 / 8;}
.col-wide{grid-column:2 / 10;}

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

.site-head{
  background:var(--bg-alt);
  border-bottom:1px solid var(--rule);
  padding:18px 0 16px;
}

.brand{
  font-family:var(--serif);
  font-size:23px;
  letter-spacing:.01em;
  color:var(--ink);
  text-decoration:none;
}
.brand:hover{color:var(--blue);}

.mainnav{display:flex;flex-wrap:wrap;gap:20px;}
.mainnav a{
  font-size:14px;
  letter-spacing:.06em;
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
}
.mainnav a:hover{color:var(--ink);border-bottom-color:var(--blue);}
.mainnav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--gold);}

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

.hero{background:var(--bg);padding:70px 0 76px;}

.spine{
  grid-column:1 / 2;
  grid-row:1 / span 4;
  min-height:220px;
  background-image:
    linear-gradient(to bottom,var(--rule),var(--rule)),
    repeating-linear-gradient(to bottom,var(--blue) 0 2px,transparent 2px 17px);
  background-size:1px 100%,24px 100%;
  background-position:0 0,5px 6px;
  background-repeat:no-repeat;
}

.kicker{
  grid-column:2 / 10;
  margin:0 0 18px;
  font-size:13px;
  letter-spacing:.14em;
  color:var(--muted);
}
.kicker .num{color:var(--gold);margin-right:10px;}

h1{
  grid-column:2 / 10;
  margin:0;
  font-family:var(--serif);
  font-weight:400;
  font-size:52px;
  line-height:1.05;
  letter-spacing:-.01em;
}

.double-rule{
  grid-column:2 / 10;
  margin:26px 0 22px;
  height:4px;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--rule);
}

.hero-lead{grid-column:2 / 8;margin:0;}

.hero-fig{
  grid-column:7 / 13;
  margin:46px 0 0;
}
.hero-fig img{width:100%;}

figcaption{
  margin-top:12px;
  font-size:13px;
  line-height:1.6;
  color:var(--muted);
  text-align:left;
}

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

.sec{padding:76px 0;background:var(--bg);}
.sec.alt{background:var(--bg-alt);}

.colon{
  grid-column:1 / 13;
  margin:0 0 34px;
  padding-bottom:9px;
  border-bottom:1px solid var(--rule);
  font-size:12px;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--muted);
}
.colon .num{color:var(--gold);margin-right:12px;}

h2{
  grid-column:2 / 10;
  margin:0 0 20px;
  font-family:var(--serif);
  font-weight:400;
  font-size:31px;
  line-height:1.15;
}

h3{
  grid-column:2 / 8;
  margin:32px 0 10px;
  font-family:var(--serif);
  font-weight:400;
  font-size:21px;
  line-height:1.25;
}

.sec p{grid-column:2 / 8;margin:0 0 18px;}
.sec p.lead{grid-column:2 / 10;font-size:20px;line-height:1.7;}
.sec p.note{font-size:15px;color:var(--muted);}

.sec ul,.sec ol{grid-column:2 / 8;margin:6px 0 22px;padding:0;list-style:none;}
.sec ul li,.sec ol li{position:relative;padding-left:28px;margin-bottom:10px;}
.sec ul li::before{
  content:"";
  position:absolute;
  left:0;top:14px;
  width:13px;height:2px;
  background:var(--blue);
}
.sec ol{counter-reset:step;}
.sec ol li::before{
  counter-increment:step;
  content:counter(step,decimal-leading-zero);
  position:absolute;left:0;top:0;
  font-size:13px;
  color:var(--gold);
  letter-spacing:.06em;
}

.sep{
  grid-column:1 / 13;
  display:flex;
  justify-content:center;
  gap:9px;
  margin:40px 0 6px;
}
.sep span{width:20px;height:2px;background:var(--gold);display:block;}
.sep span:nth-child(2){background:var(--blue);}

/* ---------- sección de contraste ---------- */

.sec.dark{background:var(--dark);color:var(--bg);}
.sec.dark h2,.sec.dark h3{color:var(--bg);}
.sec.dark .colon{color:#9aa1ac;border-bottom-color:var(--rule-dark);}
.sec.dark p{color:#dfe2e7;}
.sec.dark figcaption{color:#9aa1ac;}
.sec.dark a{color:#9dbaff;}
.sec.dark a:focus-visible{outline-color:#9dbaff;}
.sec.dark ul li::before{background:var(--gold);}

.dark-text{grid-column:2 / 8;}
.dark-text h2,.dark-text h3,.dark-text p,.dark-text ul{grid-column:auto;}
.dark-text h2{margin-top:0;}
.dark-fig{grid-column:9 / 13;margin:6px 0 0;}
.dark-fig img{width:100%;}

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

.page-head{background:var(--bg-alt);padding:64px 0 54px;border-bottom:1px solid var(--rule);}
.page-head h1{grid-column:2 / 11;font-size:42px;}
.page-head .double-rule{grid-column:2 / 11;margin-bottom:18px;}
.page-head p{grid-column:2 / 9;margin:0;color:var(--muted);}

.dropcap::first-letter{
  float:left;
  font-family:var(--serif);
  font-size:66px;
  line-height:.86;
  padding:6px 12px 0 0;
  color:var(--blue);
}

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

.site-foot{
  background:var(--bg-alt);
  border-top:1px solid var(--rule);
  padding:52px 0 58px;
  text-align:center;
}
.site-foot .inner{max-width:700px;margin:0 auto;padding:0 24px;}
.foot-name{font-family:var(--serif);font-size:22px;margin:0 0 18px;}
.foot-nav{display:flex;flex-wrap:wrap;justify-content:center;margin-bottom:18px;}
.foot-nav a{
  font-size:14px;
  color:var(--muted);
  text-decoration:none;
  padding:0 14px;
  border-left:1px solid var(--rule);
  line-height:1.5;
}
.foot-nav a:first-child{border-left:0;}
.foot-nav a:hover{color:var(--blue);}
.foot-mail{margin:0 0 14px;}
.foot-note{margin:0;font-size:13px;line-height:1.7;color:var(--muted);}

/* ---------- adaptación a pantallas estrechas ---------- */

@media (max-width:900px){
  h1{font-size:40px;}
  .hero-fig{grid-column:2 / 13;margin-top:36px;}
  .col-text,.col-wide,.hero-lead,.kicker,h1,h2,h3,
  .sec p,.sec ul,.sec ol,.double-rule,.dark-text,.dark-fig,
  .page-head h1,.page-head .double-rule,.page-head p{grid-column:2 / 13;}
  .dark-fig{margin-top:34px;max-width:420px;}
}

@media (max-width:620px){
  body{font-size:16px;}
  .wrap{grid-template-columns:1fr;column-gap:0;padding:0 20px;}
  .spine{display:none;}
  .colon,.kicker,h1,h2,h3,.sec p,.sec ul,.sec ol,.sep,
  .double-rule,.hero-lead,.hero-fig,.dark-text,.dark-fig,
  .col-text,.col-wide,
  .page-head h1,.page-head .double-rule,.page-head p{grid-column:1 / -1;}
  .hero{padding:40px 0 46px;}
  .sec{padding:46px 0;}
  .page-head{padding:40px 0 34px;}
  h1{font-size:31px;}
  .page-head h1{font-size:28px;}
  h2{font-size:24px;}
  .sec p.lead{font-size:18px;}
  .dropcap::first-letter{font-size:50px;}
  .site-head{padding:14px 0;}
  .wrap.flex{flex-direction:column;align-items:flex-start;gap:12px;}
  .mainnav{gap:14px 18px;}
  .foot-nav a{padding:0 10px;}
  .dark-fig{max-width:100%;}
}