/* Ronteza — hoja de estilo única para todo el sitio */

:root {
  --bg: #ffffff;
  --bg-alt: #eef0f3;
  --bg-contrast: #1b2ecc;
  --ink: #0b0c10;
  --ink-soft: #565c66;
  --ink-inverse: #ffffff;
  --accent: #ff4e36;
  --accent-2: #1b2ecc;
  --gap: 128px;
  --edge: 32px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
}

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

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 24px;
  max-width: 1240px;
  margin: 0 auto;
  padding-left: var(--edge);
  padding-right: var(--edge);
}

.col-text { grid-column: 4 / span 6; }
.col-list { grid-column: 4 / span 7; }
.col-wide { grid-column: 3 / span 8; }

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

h1, h2, h3 { margin: 0; font-weight: 700; }

h1 {
  font-size: clamp(2.4rem, 6vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.45rem, 2.6vw, 1.95rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-bottom: 28px;
}

h3 {
  font-size: 1.08rem;
  line-height: 1.35;
  margin: 40px 0 12px;
}

p { margin: 0 0 22px; }
p:last-child { margin-bottom: 0; }

.lead {
  font-size: 21px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.caption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 20px 0 0;
  text-align: center;
}

.marker {
  display: block;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 22px;
}

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;
}

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

.site-header {
  padding-top: 34px;
}

.site-nav {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 40px;
}

.site-nav a {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

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

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

.hero {
  min-height: 74vh;
  display: flex;
  align-items: flex-end;
  padding: 130px 0 40px;
}

.hero .grid { width: 100%; }

.hero-inner {
  grid-column: 3 / span 8;
  text-align: center;
}

.hero-inner h1 { margin-bottom: 26px; }

.hero-sub {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0 auto;
}

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

.band { padding: var(--gap) 0; }
.band-alt { background: var(--bg-alt); }

.band-contrast {
  background: var(--bg-contrast);
  color: var(--ink-inverse);
}

.band-contrast h2,
.band-contrast h3 { color: var(--ink-inverse); }

.band-contrast p { color: rgba(255, 255, 255, 0.88); }

.band-contrast .marker,
.band-contrast .caption { color: rgba(255, 255, 255, 0.72); }

.band-contrast a { color: #ffffff; }

.band-contrast li::marker { color: #ffffff; }

.band-contrast a:focus-visible { outline-color: #ffffff; }

/* ---------- imágenes ---------- */

.figure-main {
  grid-column: 3 / span 8;
  margin: 96px 0;
  text-align: center;
}

.figure-main img {
  width: 100%;
  height: auto;
  display: block;
}

.split {
  align-items: center;
  row-gap: 56px;
}

.split-figure {
  grid-column: 2 / span 4;
  margin: 0;
}

.split-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.split-figure .caption { text-align: left; }

.split-text { grid-column: 7 / span 5; }

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

ul, ol { margin: 0 0 22px; padding-left: 22px; }

li { margin-bottom: 12px; }

li::marker { color: var(--accent); }

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

.plain-list li {
  padding-left: 26px;
  position: relative;
  margin-bottom: 16px;
}

.plain-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.steps { list-style: none; padding-left: 0; counter-reset: step; }

.steps li {
  counter-increment: step;
  padding-left: 46px;
  position: relative;
  margin-bottom: 20px;
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent-2);
}

.band-contrast .steps li::before { color: rgba(255, 255, 255, 0.75); }

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

.page-head { padding: 96px 0 0; }
.page-head .col-text { text-align: center; }
.page-head h1 { font-size: clamp(2rem, 4.4vw, 3rem); }

.prose { padding: 64px 0 var(--gap); }

.prose .col-text > p:first-of-type { margin-top: 0; }

.prose h2 { margin-top: 0; }

.block + .block { margin-top: 88px; }

.rule {
  text-align: center;
  color: var(--accent-2);
  font-size: 13px;
  letter-spacing: 0.4em;
  margin: 0 0 88px;
}

.first-para { font-size: 21px; line-height: 1.55; }

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

.site-footer {
  background: var(--bg-alt);
  padding: 112px 0;
  text-align: center;
}

.footer-inner { grid-column: 3 / span 8; }

.footer-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 26px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 36px;
  margin-bottom: 26px;
}

.footer-nav a {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-nav a:hover { border-bottom-color: var(--accent); }

.footer-mail { margin-bottom: 26px; }

.footer-note {
  font-size: 13px;
  color: var(--ink-soft);
  max-width: 54ch;
  margin: 0 auto;
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  :root { --gap: 88px; --edge: 24px; }

  .col-text, .col-list, .col-wide,
  .hero-inner, .figure-main, .footer-inner { grid-column: 2 / span 10; }

  .split-figure { grid-column: 2 / span 10; }
  .split-text { grid-column: 2 / span 10; }
  .figure-main { margin: 72px 0; }
}

@media (max-width: 640px) {
  :root { --gap: 72px; --edge: 20px; }

  body { font-size: 16px; }

  .col-text, .col-list, .col-wide,
  .hero-inner, .figure-main, .footer-inner,
  .split-figure, .split-text { grid-column: 1 / -1; }

  .hero { min-height: 0; padding: 88px 0 24px; }

  .site-nav { gap: 10px 22px; }
  .site-nav a { letter-spacing: 0.1em; }
  .footer-nav { gap: 10px 20px; }

  .figure-main { margin: 56px 0; }
  .split-figure { max-width: 420px; }
  .site-footer { padding: 80px 0; }
  .block + .block { margin-top: 64px; }
  .lead, .first-para { font-size: 19px; }
}