/* Talmida — hoja de estilo común */

:root{
  --bg:#f4f5f7;
  --bg-alt:#ffffff;
  --ink:#16181d;
  --ink-soft:#656b75;
  --dark:#23262b;
  --on-dark:#f4f5f7;
  --blue:#2d5bd6;
  --gold:#c9a00f;
  --rule:6px;
  --bridge:5px;
  --pad-y:72px;
  --pad-x:44px;
}

*{box-sizing:border-box;}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:18px;
  line-height:1.9;
  overflow-x:hidden;
}

h1,h2,h3{
  font-family:Georgia,'Times New Roman',serif;
  font-weight:400;
  line-height:1.3;
  margin:0 0 28px;
  letter-spacing:.002em;
}

h1{font-size:38px;}
h2{font-size:29px;}
h3{font-size:22px;margin-bottom:18px;}

p{margin:0 0 28px;max-width:64ch;}
p:last-child{margin-bottom:0;}

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

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

img{max-width:100%;}

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

.band{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:var(--bridge);
  background:var(--dark);
  border-top:var(--rule) solid var(--dark);
}

.band:first-of-type{border-top:0;}

.cell{
  background:var(--bg);
  padding:var(--pad-y) var(--pad-x);
  min-width:0;
}

.cell--alt{background:var(--bg-alt);}
.cell--tight{padding-top:44px;padding-bottom:44px;}

.s3{grid-column:span 3;}
.s4{grid-column:span 4;}
.s5{grid-column:span 5;}
.s7{grid-column:span 7;}
.s8{grid-column:span 8;}
.s12{grid-column:1 / -1;}

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

.topbar{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:var(--bridge);
  background:var(--dark);
  border-bottom:var(--rule) solid var(--dark);
}

.topbar .cell{padding:26px var(--pad-x);}

.brand{
  font-family:Georgia,'Times New Roman',serif;
  font-size:25px;
  line-height:1.3;
  color:var(--ink);
  text-decoration:none;
  display:inline-block;
}

.brand span{
  display:block;
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:14px;
  line-height:1.6;
  color:var(--ink-soft);
}

.mainnav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:10px 30px;
}

.mainnav a{
  color:var(--ink);
  text-decoration:none;
  border-bottom:2px solid transparent;
  padding-bottom:2px;
  font-size:17px;
}

.mainnav a:hover,
.mainnav a[aria-current="page"]{border-bottom-color:var(--blue);}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  background:var(--blue);
  color:#fff;
  padding:12px 18px;
  z-index:5;
}
.skip:focus{left:0;}

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

.hero{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  grid-template-rows:auto auto auto;
  gap:var(--bridge);
  background:var(--dark);
  border-bottom:var(--rule) solid var(--dark);
}

.hero-title{
  grid-column:1 / 8;
  grid-row:1 / 3;
  background:var(--bg-alt);
  padding:var(--pad-y) var(--pad-x);
  display:flex;
  align-items:center;
}

.hero-title h1{
  font-size:44px;
  margin:0;
  max-width:20ch;
}

.hero-title h1 em{font-style:normal;display:block;}

.hero-intro{
  grid-column:8 / 13;
  grid-row:1;
  background:var(--blue);
  color:#f4f5f7;
  padding:56px var(--pad-x);
}

.hero-intro p{max-width:44ch;font-size:17px;}

.hero-field{
  grid-column:8 / 13;
  grid-row:2;
  background:var(--gold);
  min-height:96px;
}

.hero-nav{
  grid-column:1 / -1;
  grid-row:3;
  background:var(--bg);
  padding:26px var(--pad-x);
}

.hero-nav h2{
  font-size:14px;
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink-soft);
  margin:0 0 12px;
  line-height:1.6;
}

.hero-nav ol{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:8px 28px;
  counter-reset:sec;
}

.hero-nav li{counter-increment:sec;font-size:16px;}

.hero-nav li::before{
  content:counter(sec,decimal-leading-zero);
  color:var(--gold);
  font-size:13px;
  margin-right:8px;
}

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

.figure-cell{
  grid-column:1 / 8;
  padding:44px var(--pad-x);
}

.figure-cell img{
  display:block;
  width:100%;
  height:auto;
  border:var(--bridge) solid var(--dark);
}

.caption{
  font-size:14px;
  line-height:1.75;
  color:var(--ink-soft);
  max-width:38ch;
}

.caption strong{
  display:block;
  color:var(--gold);
  font-weight:400;
  margin-bottom:6px;
}

/* ---------- contenido ---------- */

.sec-no{
  display:block;
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:14px;
  line-height:1.6;
  color:var(--gold);
  margin-bottom:14px;
}

.lead{font-size:19px;}

ul.marks,
ol.steps{
  margin:0 0 28px;
  padding:0;
  list-style:none;
  max-width:56ch;
}

ul.marks li{
  position:relative;
  padding-left:26px;
  margin-bottom:14px;
  line-height:1.75;
}

ul.marks li::before{
  content:"";
  position:absolute;
  left:0;
  top:.75em;
  width:12px;
  height:2px;
  background:var(--blue);
}

ol.steps{counter-reset:st;}

ol.steps li{
  counter-increment:st;
  position:relative;
  padding-left:38px;
  margin-bottom:16px;
  line-height:1.75;
}

ol.steps li::before{
  content:counter(st,decimal-leading-zero);
  position:absolute;
  left:0;
  top:.1em;
  font-size:14px;
  color:var(--gold);
}

.note{
  font-size:15px;
  line-height:1.8;
  color:var(--ink-soft);
  border-left:2px solid var(--gold);
  padding-left:18px;
  max-width:40ch;
}

/* ---------- sección oscura ---------- */

.band--dark{
  background:var(--dark);
  gap:0;
  border-top:var(--rule) solid var(--dark);
}

.band--dark .cell{background:var(--dark);color:var(--on-dark);}
.band--dark h2,.band--dark h3{color:var(--on-dark);}
.band--dark a{color:var(--gold);}
.band--dark :focus-visible{outline-color:var(--gold);}
.band--dark .sec-no{color:var(--gold);}
.band--dark ul.marks li::before{background:var(--gold);}

.detail-cell{
  grid-column:1 / 6;
  padding:var(--pad-y) 20px var(--pad-y) var(--pad-x);
}

.detail-cell img{
  display:block;
  width:100%;
  height:auto;
}

.detail-cell figcaption{
  font-size:14px;
  line-height:1.75;
  color:#a9afb9;
  margin-top:16px;
  max-width:34ch;
}

.detail-text{grid-column:6 / 13;}
.detail-text p,.detail-text ul.marks{max-width:52ch;}

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

.contact-mail{
  font-family:Georgia,'Times New Roman',serif;
  font-size:24px;
  line-height:1.4;
}

/* ---------- páginas internas ---------- */

.page-head{
  background:var(--bg-alt);
}

.page-head h1{max-width:22ch;}

.panel--blue{background:var(--blue);color:#f4f5f7;}
.panel--blue h2{color:#f4f5f7;}
.panel--blue a{color:#fff;}
.panel--blue :focus-visible{outline-color:#fff;}

.panel--dark{background:var(--dark);color:var(--on-dark);}
.panel--dark h2{color:var(--on-dark);}
.panel--dark a{color:var(--gold);}
.panel--dark .sec-no{color:var(--gold);}
.panel--dark ul.marks li::before{background:var(--gold);}
.panel--dark :focus-visible{outline-color:var(--gold);}

.panel-inner{grid-column:1 / 8;}
.panel-inner-wide{grid-column:1 / 10;}

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

.site-footer{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:var(--bridge);
  background:var(--dark);
  border-top:var(--rule) solid var(--dark);
}

.site-footer .cell{padding:44px var(--pad-x);}

.foot-name{grid-column:span 4;background:var(--bg-alt);}
.foot-nav{grid-column:span 3;background:var(--bg);}
.foot-mail{grid-column:span 5;background:var(--dark);color:var(--on-dark);}
.foot-mail a{color:var(--gold);}
.foot-mail :focus-visible{outline-color:var(--gold);}

.foot-name .brand{margin-bottom:10px;}

.foot-nav ul{list-style:none;margin:0;padding:0;}
.foot-nav li{margin-bottom:10px;font-size:16px;}
.foot-nav a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--blue);}
.foot-nav a:hover{border-bottom-width:2px;}

.foot-mail p{font-size:15px;line-height:1.8;color:#c3c8d1;max-width:42ch;}
.foot-mail .contact-mail{font-size:20px;margin-bottom:16px;}

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

@media (max-width:1080px){
  :root{--pad-y:56px;--pad-x:32px;}
  h1{font-size:33px;}
  .hero-title h1{font-size:36px;}
  h2{font-size:26px;}
}

@media (max-width:860px){
  :root{--pad-y:40px;--pad-x:22px;}
  body{font-size:17px;line-height:1.85;}
  h1{font-size:29px;}
  .hero-title h1{font-size:30px;max-width:none;}
  h2{font-size:24px;}

  .band,.topbar,.hero,.site-footer{grid-template-columns:1fr;}

  .s3,.s4,.s5,.s7,.s8,.s12,
  .figure-cell,.detail-cell,.detail-text,
  .panel-inner,.panel-inner-wide,
  .foot-name,.foot-nav,.foot-mail{grid-column:1 / -1;}

  .hero-title,.hero-intro,.hero-field,.hero-nav{
    grid-column:1 / -1;
    grid-row:auto;
  }

  .hero-intro{padding:36px var(--pad-x);}
  .hero-field{min-height:56px;}
  .figure-cell{padding:22px var(--pad-x);}
  .detail-cell{padding:var(--pad-y) var(--pad-x) 20px;}
  .detail-text{padding-top:0;}
  .topbar .cell{padding:20px var(--pad-x);}
  .contact-mail{font-size:20px;}
}

.panel-side{grid-column:8 / -1;}
.panel--dark .caption{color:#a9afb9;}
.panel--dark .caption strong{color:var(--gold);}

@media (max-width:860px){
  .panel-side{grid-column:1 / -1;}
}