:root {
  --navy: #062a3a;
  --ink: #1a2c32;
  --muted: #5a6f76;
  --line: #d5e0e2;
  --paper: #f7f4ee;
  --card: #fffdf8;
  --aqua: #0b7f7c;
  --focus: #c45c26;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; line-height: 1.55; }
a { color: var(--aqua); }
code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 0.88em; }

.skip-link {
  position: absolute; left: 1rem; top: 0; z-index: 10;
  padding: 0.6rem 0.9rem; background: var(--navy); color: #fff;
  transform: translateY(-120%);
}
.skip-link:focus { transform: none; }

.site-header {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 1.5rem; border-bottom: 1px solid var(--line);
  background: var(--card);
}
.brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; color: inherit; }
.brand-mark {
  display: grid; place-items: center; width: 2.4rem; height: 2.4rem;
  background: var(--navy); color: #fff; font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.04em;
}
.brand strong, .brand small { display: block; line-height: 1.15; }
.brand small { color: var(--aqua); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; }
nav { display: flex; flex-wrap: wrap; gap: 0.85rem 1.2rem; }
nav a { text-decoration: none; color: var(--navy); font-size: 0.95rem; }
.nav-out { padding: 0.35rem 0.6rem; border: 1px solid var(--line); }

.hero, .labs, .aula, .recursos, .cite, .mapa { max-width: 72rem; margin: 0 auto; padding: 3.5rem 1.5rem; }
.kicker {
  margin: 0 0 0.6rem; font-size: 0.75rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--aqua); font-weight: 700;
}
h1 { margin: 0; font-size: clamp(1.9rem, 4.5vw, 3.15rem); line-height: 1.12; font-weight: 600; max-width: 22ch; }
.lede { max-width: 62ch; font-size: 1.12rem; color: var(--muted); }
.facts { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; padding: 0; list-style: none; color: var(--navy); font-size: 0.95rem; }
.facts li::before { content: "· "; color: var(--focus); font-weight: 700; }

.section-head p { max-width: 62ch; color: var(--muted); }
h2 { margin: 0 0 0.75rem; font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 600; }

.lab-grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); margin-top: 2rem; }
.lab-card {
  padding: 1.4rem 1.5rem 1.6rem; background: var(--card);
  border: 1px solid var(--line); box-shadow: 0 12px 32px rgb(6 42 58 / 6%);
}
.lab-no { margin: 0; font-size: 0.75rem; letter-spacing: 0.14em; color: var(--focus); }
.lab-card h3 { margin: 0.35rem 0 0.2rem; font-size: 1.55rem; }
.lab-sub { margin: 0 0 0.8rem; color: var(--aqua); font-size: 0.92rem; }
.lab-card dl { margin: 1rem 0; }
.lab-card dt { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-top: 0.7rem; }
.lab-card dd { margin: 0.15rem 0 0; }
.lab-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.1rem 0 0; }
.btn {
  display: inline-block; padding: 0.55rem 0.9rem; background: var(--navy); color: #fff;
  text-decoration: none; font-size: 0.92rem;
}
.btn.ghost { background: transparent; color: var(--navy); border: 1px solid var(--line); }

.aula { background: #efe8dc; max-width: none; padding-left: max(1.5rem, calc((100vw - 72rem) / 2)); padding-right: max(1.5rem, calc((100vw - 72rem) / 2)); }
.steps { max-width: 72rem; margin: 1.5rem auto 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 0.85rem; }
.steps li { counter-increment: s; padding: 0.9rem 1rem 0.9rem 3.2rem; background: var(--card); border: 1px solid var(--line); position: relative; }
.steps li::before {
  content: counter(s); position: absolute; left: 0.85rem; top: 0.85rem;
  color: var(--focus); font-weight: 700;
}

.intro { color: var(--muted); max-width: 62ch; }
.res-list { list-style: none; padding: 0; margin: 1.5rem 0 0; display: grid; gap: 1rem; }
.res-list li { padding: 1rem 0; border-top: 1px solid var(--line); }
.res-list a { font-weight: 600; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
.res-list span { display: block; margin-top: 0.25rem; color: var(--muted); }

.cite blockquote {
  margin: 1.2rem 0; padding: 1rem 1.2rem; border-left: 3px solid var(--focus);
  background: var(--card); font-size: 1.02rem;
}
.cite ul { color: var(--muted); max-width: 62ch; }

.mapa { background: #efe8dc; max-width: none; padding-left: max(1.5rem, calc((100vw - 72rem) / 2)); padding-right: max(1.5rem, calc((100vw - 72rem) / 2)); }
.eco {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 1.25rem;
  max-width: 72rem;
  margin: 1.5rem auto 0;
  align-items: start;
}
#eco-map {
  width: 100%;
  height: auto;
  background: var(--card);
  border: 1px solid var(--line);
}
.eco-edge { stroke: #9bb0b4; stroke-width: 1.6; }
.eco-dot { fill: var(--card); stroke: var(--navy); stroke-width: 2; }
.eco-node.is-hub .eco-dot { fill: var(--navy); }
.eco-node.is-on .eco-dot { fill: var(--focus); stroke: var(--focus); }
.eco-node { cursor: pointer; }
.eco-label {
  font-family: Georgia, serif;
  font-size: 13px;
  fill: var(--navy);
  text-anchor: middle;
  pointer-events: none;
}
.eco-panel {
  padding: 1.2rem 1.3rem;
  background: var(--card);
  border: 1px solid var(--line);
}
.eco-panel p { margin: 0 0 1rem; }
.eco-panel span { display: block; margin-top: 0.4rem; color: var(--muted); font-size: 0.95rem; }
.eco-panel__actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.eco-legend { margin: 1.1rem 0 0; padding: 0; list-style: none; color: var(--muted); font-size: 0.9rem; }
.eco-legend li { margin: 0.25rem 0; }

@media (max-width: 720px) {
  nav { width: 100%; }
  h1 { max-width: none; }
  .eco { grid-template-columns: 1fr; }
}

footer {
  padding: 1.5rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.92rem;
}
footer p { margin: 0.35rem 0; max-width: 72rem; }