/* Robrelma — hoja de estilo común */

:root {
  --bg: #eef4f1;
  --bg-alt: #dfeae5;
  --bg-dark: #1c2a28;
  --text: #16211f;
  --muted: #5f7370;
  --on-dark: #eef4f1;
  --accent: #2f6f63;
  --accent-2: #c25340;
  --serif: Georgia, "Times New Roman", serif;
  --sans: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --gap: 24px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.9;
  overflow-wrap: break-word;
}

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

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

a:hover { text-decoration-thickness: 2px; }

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* ---------- rejilla ---------- */

.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding-left: var(--gap);
  padding-right: var(--gap);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
}

.col-text { grid-column: 4 / span 6; }
.col-list { grid-column: 4 / span 7; }
.col-wide { grid-column: 3 / span 8; }
.col-full { grid-column: 1 / -1; }

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

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: normal;
  line-height: 1.3;
  margin: 0;
}

h1 {
  font-size: 2.1rem;
  letter-spacing: 0.01em;
}

h2 {
  font-size: 1.55rem;
  margin-bottom: 28px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 44px;
  margin-bottom: 14px;
}

p { margin: 0 0 32px; }
p:last-child { margin-bottom: 0; }

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.8;
}

.caption {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 24px 0 0;
  text-align: center;
}

.sec-num {
  display: block;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--accent-2);
  margin-bottom: 18px;
}

ul, ol {
  margin: 0 0 32px;
  padding-left: 22px;
}

li { margin-bottom: 14px; }
li:last-child { margin-bottom: 0; }

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

ul li {
  position: relative;
  padding-left: 26px;
}

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

ol { padding-left: 26px; }
ol li::marker { color: var(--accent); }

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg-alt);
  padding: 12px 18px;
  z-index: 5;
}

.skip:focus { left: 16px; top: 16px; }

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 40px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav li { margin: 0; padding: 0; }
.site-nav li::before { content: none; }

.site-nav a {
  font-size: 14px;
  letter-spacing: 0.14em;
  text-decoration: none;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 4px;
}

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

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

.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  padding-top: 48px;
  padding-bottom: 72px;
}

.hero-nav { margin-bottom: auto; }

.hero-title {
  text-align: center;
  padding-bottom: 4vh;
}

.hero-title h1 { margin: 0 auto; max-width: 20ch; }

.hero-title p {
  margin: 32px auto 0;
  max-width: 46ch;
  font-size: 1rem;
  color: var(--muted);
}

.page-head {
  padding-top: 48px;
  padding-bottom: 96px;
}

.page-head h1 {
  text-align: center;
  margin: 96px auto 0;
  max-width: 20ch;
  font-size: 1.9rem;
}

.page-head .lead {
  text-align: center;
  margin: 28px auto 0;
  max-width: 48ch;
}

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

section { padding-top: 128px; }

section.band {
  background: var(--bg-alt);
  padding-top: 128px;
  padding-bottom: 128px;
}

section.dark {
  background: var(--bg-dark);
  color: var(--on-dark);
  padding-top: 128px;
  padding-bottom: 128px;
}

.dark h2, .dark h3 { color: var(--on-dark); }
.dark .caption { color: #a9bdb8; text-align: left; }
.dark a { color: #8fc4b8; }
.dark ul li::before { color: #8fc4b8; }
.dark .sec-num { color: var(--accent-2); }
.dark :focus-visible { outline-color: #8fc4b8; }

main > section:last-of-type { padding-bottom: 128px; }

/* ---------- figuras ---------- */

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

.figure-main img { width: 100%; }

.dark-figure { grid-column: 2 / span 4; }
.dark-figure img { width: 100%; }
.dark-text { grid-column: 7 / span 5; }

/* ---------- página "sobre el proyecto" ---------- */

.about-block { padding-top: 96px; }

.about-block:first-of-type { padding-top: 0; }

.about-lead { font-size: 21px; line-height: 1.75; }

.rule {
  grid-column: 4 / span 6;
  text-align: center;
  color: var(--accent-2);
  font-size: 14px;
  letter-spacing: 0.4em;
  padding: 72px 0 0;
}

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

.site-footer {
  background: var(--bg-alt);
  margin-top: 128px;
  padding: 120px 0;
  text-align: center;
}

.site-footer .wrap > * { grid-column: 3 / span 8; }

.footer-name {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin-bottom: 40px;
}

.site-footer .site-nav { margin-bottom: 40px; }

.footer-mail { margin-bottom: 32px; }

.footer-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
  margin: 0 auto;
}

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

@media (max-width: 900px) {
  .wrap { grid-template-columns: 1fr; }
  .wrap > * { grid-column: 1 / -1 !important; }

  body { font-size: 17px; line-height: 1.85; }

  h1 { font-size: 1.7rem; }
  .page-head h1 { font-size: 1.6rem; margin-top: 56px; }
  h2 { font-size: 1.35rem; }

  section { padding-top: 72px; }
  section.band, section.dark { padding-top: 72px; padding-bottom: 72px; }
  main > section:last-of-type { padding-bottom: 72px; }

  .hero { min-height: 88vh; padding-bottom: 56px; }
  .page-head { padding-bottom: 64px; }
  .about-block { padding-top: 64px; }
  .rule { padding-top: 56px; }

  .figure-main { margin-top: 64px; }
  .dark-figure { margin-bottom: 40px; }

  .site-footer { margin-top: 72px; padding: 80px 0; }
  .site-nav ul { gap: 10px 24px; }
}

@media (max-width: 520px) {
  :root { --gap: 18px; }
  h1 { font-size: 1.5rem; }
  .about-lead { font-size: 19px; }
}