/* Stontetri — hoja de estilo común */

:root{
  --bg:#eeece8;
  --bg-alt:#dedbd5;
  --bg-dark:#232220;
  --text:#191817;
  --muted:#6b6862;
  --on-dark:#eeece8;
  --accent:#8a6a12;
  --accent-2:#4a6470;
  --maxw:1120px;
  --gap:28px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
}

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

a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(138,106,18,.4)}
a:hover{border-bottom-color:var(--accent)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;position:relative}

.grid{display:grid;grid-template-columns:repeat(12,1fr);column-gap:var(--gap);row-gap:32px}

/* --- eje vertical --- */
.axis::before{
  content:"";
  position:absolute;
  left:50%;
  top:0;
  bottom:0;
  width:1px;
  background:var(--accent);
  opacity:.5;
}

/* --- tipografía --- */
h1,h2,h3{margin:0 0 .5em;font-weight:600}

h1{
  font-size:clamp(2.35rem,6.2vw,4.1rem);
  line-height:1.06;
  letter-spacing:-.035em;
  font-weight:700;
}

h2{
  font-size:clamp(1.4rem,2.6vw,1.85rem);
  line-height:1.22;
  letter-spacing:-.015em;
}

h3{
  font-size:1.06rem;
  line-height:1.4;
  letter-spacing:-.005em;
  margin-bottom:.35em;
}

p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}

.lead{font-size:1.12rem;line-height:1.6}

.cap,.note{font-size:13px;line-height:1.55;color:var(--muted)}
.cap{margin:14px 0 0;text-align:center}

.marker{
  font-size:13px;
  letter-spacing:.06em;
  color:var(--accent-2);
  margin:0 0 14px;
}

.muted{color:var(--muted)}

/* --- cabecera y navegación --- */
.site-head{padding:26px 0 8px}
.site-head .wrap{display:flex;flex-direction:column;align-items:center;gap:14px}

.brand{
  font-size:1.02rem;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--text);
  border-bottom:none;
}
.brand:hover{color:var(--accent)}

.mainnav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
}
.mainnav li{padding:0 14px;border-left:1px solid rgba(74,100,112,.35)}
.mainnav li:first-child{border-left:none}
.mainnav a{
  font-size:14px;
  color:var(--text);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
}
.mainnav a:hover{color:var(--accent);border-bottom-color:var(--accent)}

/* --- ritmo de secciones --- */
.r1{padding:64px 0}
.r2{padding:80px 0}
.r3{padding:96px 0}
.alt{background:var(--bg-alt)}

.dark{background:var(--bg-dark);color:var(--on-dark)}
.dark h2,.dark h3{color:var(--on-dark)}
.dark .cap,.dark .note,.dark .muted{color:#a9a49b}
.dark .marker{color:#8fa6b0}
.dark a{color:#d8b458;border-bottom-color:rgba(216,180,88,.45)}
.dark a:focus-visible{outline-color:#d8b458}

/* --- portada --- */
.hero{padding:52px 0 8px}
.hero h1{max-width:15ch;margin-left:auto;margin-right:auto;text-align:center}
.hero .lead{grid-column:4/10;text-align:center}
.hero .grid{row-gap:26px}
.side-l{grid-column:3/6}
.side-r{grid-column:8/11}
.side-l p,.side-r p{font-size:15px;line-height:1.62}
.side-l{text-align:right}
.side-r{text-align:left}
.hero-top{margin-bottom:36px}

/* --- figuras --- */
.fig-main{max-width:680px;margin:0 auto;padding:8px 0 0}
.fig-main img{width:100%}

figure{margin:0}

/* --- separador en arco --- */
.arc{
  width:min(340px,72%);
  height:46px;
  margin:0 auto;
  border:1px solid rgba(74,100,112,.55);
  border-bottom:none;
  border-radius:180px 180px 0 0;
}
.arc-wrap{padding:8px 0 0}
.dark .arc{border-color:rgba(143,166,176,.6)}

/* --- composiciones de contenido --- */
.narrow{grid-column:1/8}
.col-l{grid-column:2/6}
.col-r{grid-column:8/12}
.centered{grid-column:4/10;text-align:center}
.centered-body{grid-column:4/10}
.full{grid-column:1/13}

.dark .fig-detail{grid-column:1/6}
.dark .detail-text{grid-column:7/13}
.dark .cap{text-align:left}

/* --- listas --- */
ul.check,ul.plain{list-style:none;margin:0 0 1.1em;padding:0}
ul.check li,ul.plain li{position:relative;padding-left:20px;margin-bottom:9px}
ul.check li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:8px;
  height:1px;
  background:var(--accent);
}
ul.plain li::before{
  content:"";
  position:absolute;
  left:2px;
  top:.6em;
  width:5px;
  height:5px;
  background:var(--accent-2);
}
ul.check li:last-child,ul.plain li:last-child{margin-bottom:0}
.dark ul.check li::before{background:#d8b458}

ol.steps{margin:0;padding-left:1.15em}
ol.steps li{margin-bottom:9px;padding-left:4px}
ol.steps li::marker{color:var(--accent-2);font-size:13px}

dl.pairs{margin:0}
dl.pairs dt{font-weight:600;margin-top:14px}
dl.pairs dt:first-child{margin-top:0}
dl.pairs dd{margin:0;color:var(--muted)}

/* --- páginas de texto --- */
.page-head{padding:52px 0 0;text-align:center}
.page-head h1{font-size:clamp(1.95rem,4.4vw,3rem);max-width:18ch;margin-left:auto;margin-right:auto}
.page-head p{color:var(--muted);max-width:56ch;margin-left:auto;margin-right:auto}

.doc h2{margin-top:2.2em}
.doc h2:first-of-type{margin-top:0}

/* --- pie --- */
.site-foot{padding:56px 0 64px;text-align:center;background:var(--bg-alt)}
.site-foot .arc{margin-bottom:34px}
.foot-name{font-weight:700;letter-spacing:.02em;margin:0 0 16px}
.foot-nav ul{list-style:none;margin:0 0 18px;padding:0;display:flex;flex-wrap:wrap;justify-content:center}
.foot-nav li{padding:0 12px;border-left:1px solid rgba(74,100,112,.35)}
.foot-nav li:first-child{border-left:none}
.foot-nav a{font-size:14px;color:var(--text);border-bottom:1px solid transparent}
.foot-nav a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.foot-mail{margin:0 0 10px}
.foot-line{font-size:13px;color:var(--muted);max-width:52ch;margin:0 auto}

/* --- adaptación --- */
@media (max-width:900px){
  .hero .lead,.centered,.centered-body{grid-column:2/12}
  .narrow{grid-column:1/11}
  .col-l{grid-column:1/7}
  .col-r{grid-column:7/13}
  .side-l{grid-column:2/7}
  .side-r{grid-column:7/12}
  .dark .fig-detail{grid-column:1/6}
  .dark .detail-text{grid-column:6/13}
}

@media (max-width:700px){
  body{font-size:16px}
  .wrap{padding:0 20px}
  .axis::before{display:none}
  .grid{display:block}
  .grid > * + *{margin-top:26px}
  .hero{padding:34px 0 4px}
  .hero .lead,.side-l,.side-r,.hero h1{text-align:left}
  .hero h1{max-width:none}
  .r1{padding:40px 0}
  .r2{padding:48px 0}
  .r3{padding:56px 0}
  .page-head{padding:34px 0 0;text-align:left}
  .page-head h1,.page-head p{margin-left:0;max-width:none}
  .cap{text-align:left}
  .arc{width:min(240px,80%);height:34px}
  .mainnav li{padding:0 10px}
  .site-foot{padding:44px 0 52px}
}