/* Zusendandu — hoja de estilo común */

:root{
  --bg:#181a19;
  --bg-alt:#202422;
  --bg-contrast:#eef0ee;
  --text:#e6e9e6;
  --muted:#8f9691;
  --ink:#181a19;
  --accent:#5fae86;
  --accent2:#d8c07a;
  --gap:24px;
  --step:84px;
  --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(--text);
  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(--accent);text-decoration:none;border-bottom:1px solid rgba(95,174,134,.45);}
a:hover{border-bottom-color:var(--accent);}
a:focus-visible,
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;}

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

.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 28px;
}

.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:0 var(--gap);
}

/* columnas de texto: 7 columnas con desplazamiento progresivo */
.col7{grid-column:1 / span 7;}
.col7.s1{grid-column:2 / span 7;}
.col7.s2{grid-column:3 / span 7;}
.col7.s3{grid-column:4 / span 7;}

/* ---------- cruces de registro ---------- */

.mark{
  position:absolute;
  width:22px;
  height:22px;
  --mark-c:var(--muted);
  pointer-events:none;
}
.mark::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(to right,var(--mark-c) 0 100%) center/100% 1px no-repeat,
    linear-gradient(to bottom,var(--mark-c) 0 100%) center/1px 100% no-repeat;
}
.mark::after{
  content:"";
  position:absolute;
  left:50%;top:50%;
  width:9px;height:9px;
  margin:-5px 0 0 -5px;
  border:1px solid var(--mark-c);
  border-radius:50%;
}
.mark.tl{left:-11px;top:-11px;}
.mark.tr{right:-11px;top:-11px;}
.mark.bl{left:-11px;bottom:-11px;}
.mark.br{right:-11px;bottom:-11px;}
.mark.gold{--mark-c:var(--accent2);}

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

.site-head{
  padding:26px 0 22px;
  border-bottom:1px solid rgba(143,150,145,.28);
}
.site-head .inner{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:14px 28px;
}
.brand{
  font-family:var(--serif);
  font-size:23px;
  letter-spacing:.02em;
  color:var(--text);
  border:0;
}
.brand:hover{color:var(--accent);}
.site-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:6px 22px;
  margin:0;padding:0;
}
.site-nav a{
  font-size:15px;
  color:var(--muted);
  border-bottom:1px solid transparent;
}
.site-nav a:hover,.site-nav a[aria-current="page"]{
  color:var(--text);
  border-bottom-color:var(--accent);
}

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

.band{padding:var(--step) 0;}
.band.alt{background:var(--bg-alt);}
.band.tight{padding-top:calc(var(--step) * .6);}

.rule{
  margin:0 0 34px;
  height:6px;
  position:relative;
  max-width:520px;
}
.rule::before,
.rule::after{
  content:"";
  position:absolute;
  height:2px;
  width:100%;
  left:0;
}
.rule::before{background:var(--accent);top:0;}
.rule::after{background:var(--accent2);top:4px;left:24px;}

.secnum{
  font-family:var(--sans);
  font-size:13px;
  line-height:1.6;
  color:var(--accent2);
  margin:0 0 10px;
  letter-spacing:.06em;
}

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

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

h1{
  font-size:clamp(34px,5.2vw,58px);
  line-height:1.05;
  margin:0 0 34px;
  letter-spacing:-.01em;
}
.h1-block{grid-column:1 / span 9;position:relative;}
.h1-line2{position:relative;display:inline-block;}
.h1-line2::after{
  content:"";
  position:absolute;
  left:-6px;right:-6px;
  top:64%;
  height:2px;
  background:var(--accent);
  opacity:.85;
}

h2{
  font-size:clamp(24px,2.6vw,32px);
  line-height:1.15;
  margin:0 0 18px;
}
h3{
  font-size:20px;
  line-height:1.25;
  margin:34px 0 12px;
}

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

.lead{font-size:18px;}

.caption{
  font-size:13px;
  line-height:1.6;
  color:var(--muted);
  margin:12px 0 0;
}

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

.hero{
  padding:calc(var(--step) * .9) 0 var(--step);
}
.hero-area{position:relative;}
.hero-intro{grid-column:1 / span 5;margin-top:6px;}
.hero-topics{grid-column:8 / span 4;}
.hero-topics h2{
  font-family:var(--sans);
  font-size:13px;
  line-height:1.6;
  color:var(--accent2);
  margin:0 0 12px;
}
.hero-topics ul{list-style:none;margin:0;padding:0;}
.hero-topics li{
  position:relative;
  padding-left:20px;
  font-size:15px;
  line-height:1.7;
  color:var(--muted);
  margin-bottom:9px;
}
.hero-topics li::before{
  content:"";
  position:absolute;
  left:0;top:.62em;
  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 img{width:100%;}
.figure-main .caption{max-width:520px;}

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

ul.checks,ol.steps{margin:0 0 20px;padding:0;}
ul.checks{list-style:none;}
ul.checks li{
  position:relative;
  padding-left:22px;
  margin-bottom:10px;
}
ul.checks li::before{
  content:"";
  position:absolute;
  left:0;top:.68em;
  width:7px;height:7px;
  background:var(--accent2);
}
ol.steps{padding-left:22px;}
ol.steps li{margin-bottom:10px;padding-left:4px;}
ol.steps li::marker{color:var(--accent);font-family:var(--serif);}

/* ---------- sección contrastada ---------- */

.contrast{
  background:var(--bg-contrast);
  color:var(--ink);
  padding:var(--step) 0;
}
.contrast h2,.contrast h3{color:var(--ink);}
.contrast .secnum{color:#8a7433;}
.contrast .caption{color:#5a625c;}
.contrast a{color:#2f7a55;border-bottom-color:rgba(47,122,85,.5);}
.contrast .rule::before{background:#2f7a55;}
.contrast .rule::after{background:#a98f3c;}
.contrast ul.checks li::before{background:#a98f3c;}
.contrast .mark{--mark-c:#6d7671;}

.figure-detail{
  grid-column:1 / span 5;
  margin:0;
  position:relative;
}
.figure-detail .frame{position:relative;}
.detail-text{grid-column:7 / span 6;}

/* ---------- about ---------- */

.about-body{
  grid-column:3 / span 7;
  position:relative;
}
.about-rail{
  grid-column:1 / span 1;
  position:relative;
}
.about-rail .mark{position:absolute;left:0;}
.about-rail .mark:nth-child(1){top:10px;}
.about-rail .mark:nth-child(2){top:160px;}
.about-rail .mark:nth-child(3){top:310px;}
.about-rail .mark:nth-child(4){top:460px;}

/* ---------- páginas de texto ---------- */

.doc{grid-column:2 / span 8;}
.doc h2{margin-top:44px;}
.doc h2:first-of-type{margin-top:0;}

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

.contact-box{grid-column:1 / span 7;}
.contact-box .mail{
  font-family:var(--serif);
  font-size:clamp(21px,2.4vw,27px);
}

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

.site-foot{
  background:var(--bg-alt);
  padding:44px 0 52px;
}
.site-foot .rule{margin-bottom:30px;}
.foot-main{grid-column:1 / span 7;}
.foot-side{grid-column:8 / span 5;}
.foot-name{
  font-family:var(--serif);
  font-size:22px;
  margin:0 0 10px;
}
.foot-main p{color:var(--muted);font-size:15px;line-height:1.7;}
.foot-side ul{list-style:none;margin:0 0 16px;padding:0;}
.foot-side li{margin-bottom:8px;}
.foot-side a{font-size:15px;color:var(--muted);border-bottom-color:transparent;}
.foot-side a:hover{color:var(--text);border-bottom-color:var(--accent);}
.foot-mail{font-size:15px;}
.foot-note{
  grid-column:1 / span 12;
  margin-top:32px;
  padding-top:18px;
  border-top:1px solid rgba(143,150,145,.22);
  color:var(--muted);
  font-size:13px;
  line-height:1.7;
}

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

@media (max-width:980px){
  .h1-block{grid-column:1 / span 12;}
  .hero-intro{grid-column:1 / span 12;}
  .hero-topics{grid-column:1 / span 12;margin-top:34px;}
  .figure-main{grid-column:1 / span 12;}
  .figure-detail{grid-column:1 / span 6;}
  .detail-text{grid-column:1 / span 12;margin-top:34px;}
  .col7,.col7.s1,.col7.s2,.col7.s3{grid-column:1 / span 12;}
  .doc{grid-column:1 / span 12;}
  .contact-box{grid-column:1 / span 12;}
  .about-rail{display:none;}
  .about-body{grid-column:1 / span 12;}
  .foot-main{grid-column:1 / span 12;}
  .foot-side{grid-column:1 / span 12;margin-top:28px;}
}

@media (max-width:640px){
  :root{--step:50px;--gap:16px;}
  body{font-size:16px;line-height:1.75;}
  .wrap{padding:0 18px;}
  .figure-detail{grid-column:1 / span 12;}
  .site-head .inner{display:block;}
  .site-nav{margin-top:14px;}
  .site-nav ul{gap:8px 18px;}
  .mark.tl,.mark.bl{left:-7px;}
  .mark.tr,.mark.br{right:-7px;}
  .mark{width:16px;height:16px;}
  .mark.tl,.mark.tr{top:-8px;}
  .mark.bl,.mark.br{bottom:-8px;}
}