*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 1.5rem); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background var(--duration-normal), color var(--duration-normal);
}

img, svg { display: block; max-width: 100%; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  max-width: 1180px;
  margin: 0 auto;
}

main {
  padding: var(--space-lg) clamp(var(--space-md), 4vw, 4rem);
  max-width: calc(var(--maxw) + 6rem);
  min-width: 0;
}

/* secciones: jerarquía editorial, no centrado uniforme */
section { padding-block: var(--space-section); scroll-margin-top: var(--topbar-h); }
section h2 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-md);
  max-width: 18ch;
}
section p {
  margin-bottom: var(--space-sm);
  color: var(--text);
  max-width: 68ch;
}
section p + p { margin-top: 0; }

@media (max-width: 768px) {
  .layout { grid-template-columns: 1fr; }
  main { padding-inline: var(--space-sm); }
}