/* Trirdeso — hoja de estilos común */

:root {
  --bg: #eceff1;
  --bg-alt: #dde3e7;
  --bg-dark: #1f2a33;
  --text: #151c22;
  --muted: #606d78;
  --on-dark: #eceff1;
  --accent: #a2472c;
  --accent-2: #3f6b86;
  --gap: 24px;
  --maxw: 1240px;
  --pad: 32px;
}

* { 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: 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;
}

h1 { font-size: 44px; letter-spacing: -0.2px; }
h2 { font-size: 27px; margin-bottom: 16px; }
h3 { font-size: 21px; margin-bottom: 10px; }

p { margin: 0 0 20px; max-width: 68ch; }
p:last-child { margin-bottom: 0; }

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

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
}

.band { padding-block: 32px; }
.band--alt { background: var(--bg-alt); padding-block: 48px; }
.band--dark { background: var(--bg-dark); color: var(--on-dark); padding-block: 56px; }

.col-text { grid-column: 1 / 7; }
.band--shift .col-text { grid-column: 4 / 10; }
.col-wide { grid-column: 1 / 10; }

/* separador: línea de 1px con la longitud exacta de 2 columnas */
.rule {
  width: calc((100% - 5 * var(--gap)) / 3 + var(--gap));
  height: 1px;
  background: var(--accent);
  border: 0;
  margin: 0 0 20px;
}

.eyebrow {
  font-size: 14px;
  line-height: 1.6;
  color: var(--accent-2);
  margin: 0 0 6px;
  letter-spacing: 0.04em;
}

.note { font-size: 14px; line-height: 1.7; color: var(--muted); }

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

.site-head { padding-top: 28px; }

.nav-line {
  grid-column: 1 / 6;
  height: 1px;
  background: var(--accent);
  margin-bottom: 14px;
}

.nav {
  grid-column: 1 / 13;
  font-size: 13px;
  line-height: 1.6;
}

.nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 34px;
  margin: 0;
  padding: 0;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.08em;
}

.nav a:hover,
.nav a[aria-current="page"] { color: var(--accent); }

.nav .brand {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
  letter-spacing: 0.02em;
}

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

.hero { padding-top: 52px; }

.hero h1 { grid-column: 1 / 8; }
.hero h1 .l1 {
  display: block;
  padding-left: calc((100% - 6 * var(--gap)) * 2 / 7 + var(--gap));
}
.hero h1 .l2 { display: block; }

.hero-topics {
  grid-column: 10 / 13;
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  align-self: start;
}

.hero-topics li {
  border-top: 1px solid #c4cdd3;
  padding: 9px 0;
}
.hero-topics li:last-child { border-bottom: 1px solid #c4cdd3; }

.hero-lead { grid-column: 1 / 7; margin-top: 40px; }

/* imagen principal: cuadrado 1:1 sobre 5 columnas, desplazado al borde derecho */
.figure-main {
  grid-column: 8 / 13;
  margin: 48px 0 0;
  align-self: start;
}

.figure-main img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  outline: 1px solid var(--accent);
  outline-offset: 8px;
}

.figure-main figcaption {
  margin-top: 22px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.caption-left {
  grid-column: 1 / 4;
  align-self: end;
  margin: 48px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- listas de contenido ---------- */

ul.checks, ol.steps {
  margin: 0 0 20px;
  padding: 0 0 0 22px;
  max-width: 66ch;
}

ul.checks { list-style: none; padding-left: 0; }

ul.checks li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
}

ul.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 11px;
  height: 1px;
  background: var(--accent);
}

ol.steps li { margin-bottom: 10px; }
ol.steps li::marker { color: var(--accent-2); }

dl.terms { margin: 0 0 20px; max-width: 66ch; }
dl.terms dt { color: var(--accent-2); font-size: 16px; margin-top: 16px; }
dl.terms dd { margin: 2px 0 0; }

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

.band--dark h2 { color: var(--on-dark); }
.band--dark .rule { background: var(--accent); }
.band--dark .eyebrow { color: #8fb0c4; }
.band--dark a { color: #e0a08c; }
.band--dark .figure-detail figcaption { color: #97a6b1; }

.figure-detail {
  grid-column: 1 / 5;
  margin: 0;
}

.figure-detail img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.figure-detail figcaption {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
}

.dark-text { grid-column: 6 / 12; }

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

.page-head { padding-top: 52px; }
.page-head h1 { grid-column: 1 / 9; font-size: 38px; }
.page-head .intro { grid-column: 1 / 7; margin-top: 28px; }

.doc { grid-column: 1 / 7; }

.doc section { margin-bottom: 56px; }
.doc section:last-child { margin-bottom: 0; }

.doc h2 {
  position: relative;
  padding-left: 40px;
}

.doc h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

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

.site-foot { padding: 56px 0 64px; margin-top: 64px; background: var(--bg-alt); }

.foot-line {
  grid-column: 1 / 6;
  height: 1px;
  background: var(--accent);
  margin-bottom: 26px;
}

.foot-a { grid-column: 1 / 6; }
.foot-b { grid-column: 6 / 9; }
.foot-c { grid-column: 9 / 13; }

.foot-a .name {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  display: block;
  margin-bottom: 8px;
}

.site-foot p { font-size: 14px; line-height: 1.7; color: var(--muted); margin-bottom: 10px; }

.site-foot ul { list-style: none; margin: 0; padding: 0; font-size: 14px; line-height: 2; }
.site-foot ul a { color: var(--text); text-decoration: none; }
.site-foot ul a:hover { color: var(--accent); text-decoration: underline; }

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

@media (max-width: 1080px) {
  h1 { font-size: 38px; }
  .col-text, .band--shift .col-text { grid-column: 1 / 9; }
  .hero h1 { grid-column: 1 / 9; }
  .hero-topics { grid-column: 10 / 13; }
  .figure-main { grid-column: 7 / 13; }
  .caption-left { grid-column: 1 / 5; }
  .dark-text { grid-column: 6 / 13; }
  .doc, .page-head .intro, .hero-lead { grid-column: 1 / 9; }
}

@media (max-width: 860px) {
  :root { --pad: 22px; --gap: 18px; }

  body { font-size: 17px; }
  h1 { font-size: 31px; }
  h2 { font-size: 24px; }

  .band { padding-block: 20px; }
  .band--alt { padding-block: 30px; }
  .band--dark { padding-block: 36px; }

  .wrap > * { grid-column: 1 / -1 !important; }

  .rule { width: 96px; }

  .hero { padding-top: 34px; }
  .hero h1 .l1 { padding-left: 0; }
  .hero-topics { margin-top: 28px; }
  .hero-lead { margin-top: 28px; }

  .figure-main { margin-top: 32px; }
  .figure-main img { outline-offset: 5px; }
  .caption-left { margin: 20px 0 0; align-self: auto; }

  .figure-detail { margin-bottom: 26px; }
  .figure-detail img { aspect-ratio: 4 / 5; }

  .doc section { margin-bottom: 40px; }
  .page-head h1 { font-size: 29px; }

  .site-foot { margin-top: 40px; padding: 36px 0 44px; }
  .foot-a, .foot-b, .foot-c { margin-bottom: 24px; }
  .foot-c { margin-bottom: 0; }
  .nav ul { gap: 4px 20px; }
}