/* Borvusu — hoja de estilo común */

:root {
  --paper: #f1f2f0;
  --paper-alt: #e3e5e2;
  --paper-deep: #d8dbd7;
  --ink: #171917;
  --ink-soft: #6a6e6a;
  --dark: #141614;
  --green: #2a6b3c;
  --ochre: #8a6a20;
  --serif: Georgia, 'Times New Roman', Times, serif;
  --sans: system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  overflow-x: hidden;
}

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

.grid {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 52px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 28px;
}

/* bloque de texto: siempre 6 columnas, la posición cambia con el escalón */
.col-6 { grid-column: 1 / span 6; }
.step-0 .col-6 { grid-column: 1 / span 6; }
.step-1 .col-6 { grid-column: 2 / span 6; }
.step-2 .col-6 { grid-column: 3 / span 6; }
.step-3 .col-6 { grid-column: 4 / span 6; }

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

.band {
  padding: 88px 0;
  background: var(--paper);
}
.band.alt { background: var(--paper-alt); }
.band.dark {
  background: var(--dark);
  color: var(--paper);
}
.band.dark .sec-num { color: #c2a45a; }
.band.dark .caption { color: #a8aca7; }
.band.dark a { color: #9ccfa6; }
.band.dark li::marker { color: #9ccfa6; }

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

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

h1 {
  font-size: clamp(2.5rem, 6.4vw, 4.7rem);
  line-height: 1.03;
  letter-spacing: -0.015em;
  margin: 0;
}

h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.1rem);
  line-height: 1.22;
  margin: 0 0 6px;
}

h3 {
  font-style: italic;
  font-size: 1.22rem;
  line-height: 1.35;
  margin: 34px 0 0;
}

p { margin: 1.35em 0 0; max-width: 34em; }
h2 + p, h3 + p { margin-top: 0.75em; }

.lead { font-size: 1.12rem; }

.sec-num {
  display: block;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ochre);
  margin-bottom: 14px;
}

.caption {
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 12px 0 0;
  max-width: 44em;
}

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

ul, ol { margin: 1.35em 0 0; padding-left: 1.15em; max-width: 34em; }
li { margin: 0 0 10px; }
li::marker { color: var(--green); }

.topics {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: none;
}
.topics li {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
  padding: 9px 0;
  border-top: 1px solid rgba(138, 106, 32, 0.35);
}

/* ---------- enlaces y foco ---------- */

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

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}
.band.dark a:focus-visible,
.site-footer a:focus-visible { outline-color: #9ccfa6; }

/* ---------- cabecera de portada: tres capas ---------- */

.layer-nav { background: var(--paper); padding: 18px 0; }
.layer-title {
  background: var(--paper-alt);
  padding: 130px 0 46px;
  display: flex;
  align-items: flex-end;
}
.layer-intro { background: var(--paper-deep); padding: 58px 0 66px; }

.layer-title .grid > * { grid-column: 1 / span 10; }

.kicker {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ochre);
  margin: 0 0 22px;
  max-width: none;
}

.layer-intro .intro-text { grid-column: 1 / span 6; }
.layer-intro .intro-list { grid-column: 8 / span 5; }
.layer-intro .intro-text p:first-child { margin-top: 0; }

/* ---------- navegación ---------- */

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
}
.site-nav li { margin: 0; }
.site-nav a {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.site-nav a:hover { border-bottom-color: var(--green); }
.site-nav a[aria-current='page'] { border-bottom-color: var(--ochre); }
.site-nav .grid > * { grid-column: 1 / span 12; }

/* ---------- imágenes ---------- */

figure { margin: 0; }

.figure-main {
  grid-column: 4 / span 9;
  margin-top: 54px;
}
.figure-main img { width: 100%; height: auto; display: block; }

.dark-figure { grid-column: 1 / span 4; }
.dark-figure img { width: 100%; height: auto; display: block; }
.dark-text { grid-column: 6 / span 6; }
.dark-text > :first-child { margin-top: 0; }

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

.page-head {
  background: var(--paper-alt);
  padding: 96px 0 52px;
}
.page-head h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
.page-head .grid > * { grid-column: 1 / span 9; }
.page-head p { color: var(--ink-soft); }

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

.site-footer {
  background: var(--dark);
  color: var(--paper);
  padding: 64px 0 44px;
  margin: 0;
}
.footer-name {
  grid-column: 1 / span 12;
  font-size: clamp(3.2rem, 13vw, 8.5rem);
  line-height: 0.92;
  letter-spacing: -0.02em;
  margin: 0 0 54px;
  font-weight: 400;
}
.footer-col { grid-column: span 4; }
.footer-col .rule {
  display: block;
  width: 46px;
  height: 1px;
  background: var(--ochre);
  margin-bottom: 16px;
}
.footer-col h2 {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #a8aca7;
  margin: 0 0 12px;
  font-weight: 400;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; max-width: none; }
.footer-col li { margin: 0 0 8px; }
.footer-col a,
.footer-col p {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.55;
  color: var(--paper);
  max-width: 26em;
}
.footer-col p { margin: 0; color: #c9ccc8; }
.footer-col a { color: var(--paper); text-decoration: none; border-bottom: 1px solid rgba(241, 242, 240, 0.35); }
.footer-col a:hover { border-bottom-color: #9ccfa6; }
.footer-note {
  grid-column: 1 / span 12;
  margin-top: 48px;
  font-family: var(--sans);
  font-size: 12px;
  color: #8f938e;
}

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

@media (max-width: 980px) {
  .grid { column-gap: 22px; padding: 0 34px; }
  .step-1 .col-6, .step-2 .col-6, .step-3 .col-6 { grid-column: 1 / span 9; }
  .col-6 { grid-column: 1 / span 9; }
  .layer-intro .intro-text { grid-column: 1 / span 7; }
  .layer-intro .intro-list { grid-column: 9 / span 4; }
  .figure-main { grid-column: 3 / span 10; }
  .dark-figure { grid-column: 1 / span 5; }
  .dark-text { grid-column: 7 / span 6; }
  .page-head .grid > * { grid-column: 1 / span 11; }
}

@media (max-width: 720px) {
  body { font-size: 17px; }
  .grid { padding: 0 22px; column-gap: 0; }
  .grid > *,
  .col-6,
  .step-1 .col-6, .step-2 .col-6, .step-3 .col-6,
  .layer-intro .intro-text, .layer-intro .intro-list,
  .figure-main, .dark-figure, .dark-text,
  .page-head .grid > *, .layer-title .grid > *,
  .footer-col, .footer-name, .footer-note {
    grid-column: 1 / -1;
  }
  .band { padding: 56px 0; }
  .layer-title { padding: 74px 0 34px; }
  .layer-intro { padding: 40px 0 46px; }
  .layer-intro .intro-list { margin-top: 34px; }
  .page-head { padding: 62px 0 38px; }
  .figure-main { margin-top: 38px; }
  .dark-text { margin-top: 30px; }
  .footer-col { margin-bottom: 34px; }
  .footer-name { margin-bottom: 40px; }
  p, ul, ol { max-width: none; }
}