/* Flantane — hoja de estilos común */

:root{
  --bg:#eef4f1;
  --bg-alt:#dfeae5;
  --bg-dark:#1c2a28;
  --ink:#16211f;
  --ink-soft:#5f7370;
  --ink-inv:#eef4f1;
  --accent:#2f6f63;
  --accent-2:#c25340;
  --serif:Georgia,'Times New Roman',serif;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --wrap:1120px;
  --gap:24px;
}

*{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(--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}

.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 24px;
}

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

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

h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:-.01em;margin:0}
h1{font-size:52px;line-height:1.05}
h2{font-size:30px;line-height:1.15;margin-bottom:14px}
h3{font-size:21px;line-height:1.25;margin-bottom:8px}

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

.lead{font-size:19px;line-height:1.75}

.caption{
  font-family:var(--sans);
  font-size:13px;
  line-height:1.6;
  color:var(--ink-soft);
  margin:14px 0 0;
}

.mark{color:var(--accent-2)}

.num{
  font-family:var(--serif);
  font-size:13px;
  color:var(--accent-2);
  display:block;
  margin-bottom:10px;
}

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

.site-head{
  border-bottom:1px solid rgba(47,111,99,.2);
  background:var(--bg);
}

.site-head .wrap{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:baseline;
  gap:10px 28px;
  padding-top:22px;
  padding-bottom:22px;
}

.brand{
  font-family:var(--serif);
  font-size:22px;
  letter-spacing:.06em;
  color:var(--ink);
  text-decoration:none;
}
.brand:hover{color:var(--accent)}

.site-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:6px 22px;
  margin:0;
  padding:0;
}
.site-nav a{
  font-size:15px;
  color:var(--ink);
  text-decoration:none;
  padding-bottom:3px;
  border-bottom:1px solid transparent;
}
.site-nav a:hover{border-bottom-color:var(--accent);color:var(--accent)}

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

.s-64{padding:64px 0}
.s-80{padding:80px 0}
.s-96{padding:96px 0}
.tone{background:var(--bg-alt)}

.dark{
  background:var(--bg-dark);
  color:var(--ink-inv);
}
.dark h2,.dark h3{color:var(--ink-inv)}
.dark .caption{color:#a9c1bb}
.dark a{color:#8fc7ba}

/* ---------- arco separador ---------- */

.arc{
  width:33.333%;
  min-width:180px;
  height:46px;
  margin:0 auto;
  border:1px solid transparent;
  border-top-color:var(--accent-2);
  border-radius:50% 50% 0 0 / 100% 100% 0 0;
}

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

.hero{
  position:relative;
  padding:88px 0 72px;
}
.hero .wrap{position:relative}
.hero .wrap::before{
  content:"";
  position:absolute;
  top:-88px;
  bottom:-72px;
  left:50%;
  width:1px;
  background:linear-gradient(to bottom,rgba(47,111,99,0),rgba(47,111,99,.55) 18%,rgba(47,111,99,.55) 82%,rgba(47,111,99,0));
}

.hero-title{
  text-align:center;
  max-width:15ch;
  margin:0 auto;
  position:relative;
}

.hero-lead{
  grid-column:4 / span 6;
  text-align:center;
  margin-top:34px;
}

.hero-sides{margin-top:52px;align-items:start}
.hero-side-l{grid-column:2 / span 3}
.hero-side-r{grid-column:8 / span 3}
.hero-side p{font-size:15px;line-height:1.75;color:var(--ink-soft);margin:0}
.hero-side h2{font-size:17px;font-family:var(--sans);letter-spacing:.02em;margin-bottom:8px;color:var(--ink)}

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

.figure-main{
  margin:56px auto 0;
  max-width:680px;
  text-align:center;
}
.figure-main img{
  width:100%;
  border:1px solid rgba(22,33,31,.12);
}

/* ---------- bloques simétricos ---------- */

.sym-head{text-align:center;max-width:34ch;margin:0 auto 44px}
.sym-head p{color:var(--ink-soft);margin-top:12px}

.col-l{grid-column:2 / span 4}
.col-r{grid-column:7 / span 4}

.narrow{grid-column:4 / span 6}
.off-left{grid-column:1 / span 7}

.stack > * + *{margin-top:40px}

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

ul.check,ol.steps{margin:0;padding:0;list-style:none}
ul.check li{
  position:relative;
  padding-left:22px;
  margin-bottom:12px;
  line-height:1.7;
}
ul.check li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:9px;
  height:1px;
  background:var(--accent);
}
.dark ul.check li::before{background:#8fc7ba}

ol.steps{counter-reset:st}
ol.steps li{
  counter-increment:st;
  position:relative;
  padding-left:34px;
  margin-bottom:14px;
  line-height:1.7;
}
ol.steps li::before{
  content:counter(st,decimal-leading-zero);
  position:absolute;
  left:0;
  top:0;
  font-family:var(--serif);
  font-size:13px;
  color:var(--accent-2);
}

dl.terms{margin:0}
dl.terms dt{font-family:var(--serif);font-size:19px;margin-top:22px}
dl.terms dd{margin:6px 0 0;color:var(--ink-soft)}

/* ---------- sección oscura con imagen de detalle ---------- */

.detail-grid{align-items:center;row-gap:36px}
.figure-detail{grid-column:1 / span 5;margin:0}
.figure-detail img{width:100%;border:1px solid rgba(238,244,241,.18)}
.detail-text{grid-column:7 / span 6}

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

.contact-box{
  grid-column:4 / span 6;
  text-align:center;
}
.contact-box .mail{
  font-family:var(--serif);
  font-size:24px;
  display:inline-block;
  margin-top:6px;
}

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

.site-foot{
  background:var(--bg-alt);
  padding:56px 0 64px;
  text-align:center;
}
.site-foot .arc{margin-bottom:34px}
.foot-brand{
  font-family:var(--serif);
  font-size:24px;
  letter-spacing:.06em;
  display:block;
  margin-bottom:18px;
}
.foot-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  margin:0 0 20px;
  padding:0;
  font-size:15px;
}
.foot-nav li + li::before{
  content:"/";
  color:var(--accent-2);
  margin:0 12px;
}
.foot-nav a{color:var(--ink);text-decoration:none;border-bottom:1px solid transparent}
.foot-nav a:hover{border-bottom-color:var(--accent);color:var(--accent)}
.foot-mail{margin:0 0 10px}
.foot-note{
  font-size:13px;
  color:var(--ink-soft);
  max-width:56ch;
  margin:0 auto;
  line-height:1.7;
}

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

.page-head{padding:72px 0 8px;text-align:center}
.page-head h1{font-size:42px;max-width:20ch;margin:0 auto}
.page-head p{
  max-width:60ch;
  margin:20px auto 0;
  color:var(--ink-soft);
}

.doc{grid-column:4 / span 6}
.doc h2{margin-top:44px}
.doc h2:first-child{margin-top:0}
.doc h3{margin-top:28px}

.pair-l{grid-column:2 / span 4}
.pair-r{grid-column:8 / span 4}
.pair h3{font-family:var(--sans);font-size:16px;letter-spacing:.02em}
.pair p{font-size:15px;color:var(--ink-soft);line-height:1.75}

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

@media (max-width:900px){
  h1{font-size:40px}
  .page-head h1{font-size:34px}
  h2{font-size:26px}
  .hero{padding:64px 0 56px}
  .hero .wrap::before{top:-64px;bottom:-56px}
  .hero-lead,.narrow,.doc,.contact-box{grid-column:2 / span 10}
  .hero-side-l{grid-column:1 / span 6}
  .hero-side-r{grid-column:7 / span 6}
  .col-l{grid-column:1 / span 6}
  .col-r{grid-column:7 / span 6}
  .off-left{grid-column:1 / span 10}
  .figure-detail{grid-column:1 / span 6}
  .detail-text{grid-column:7 / span 6}
  .pair-l{grid-column:1 / span 6}
  .pair-r{grid-column:7 / span 6}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.75}
  h1{font-size:31px}
  .page-head h1{font-size:28px}
  h2{font-size:23px}
  .lead{font-size:17px}
  .wrap{padding:0 18px}
  .grid{row-gap:26px}
  .s-64,.s-80,.s-96{padding:44px 0}
  .s-96{padding:56px 0}
  .hero{padding:48px 0 44px}
  .hero .wrap::before{display:none}
  .hero-title{max-width:none}
  .hero-lead,.narrow,.doc,.contact-box,
  .hero-side-l,.hero-side-r,
  .col-l,.col-r,.off-left,
  .figure-detail,.detail-text,
  .pair-l,.pair-r{grid-column:1 / -1}
  .hero-sides{margin-top:34px}
  .figure-main{margin-top:36px}
  .site-head .wrap{flex-direction:column;align-items:center;gap:14px}
  .site-nav ul{gap:6px 16px}
  .arc{width:60%}
  .contact-box .mail{font-size:19px}
  .foot-nav li + li::before{margin:0 8px}
}