/* Base mínima de la etapa 1: solo orden y legibilidad. El trabajo visual llega en la etapa 2. */
:root {
  --text: #1a1a1a;
  --muted: #666;
  --bg: #fff;
  --line: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #eaeaea;
    --muted: #999;
    --bg: #111;
    --line: #2a2a2a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 720px;
  padding: 0 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a { color: inherit; }

.site-header,
.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.site-header { border-bottom: 1px solid var(--line); }
.site-footer { border-top: 1px solid var(--line); margin-top: 48px; color: var(--muted); }
.site-footer p { margin: 0; }

.site-name { font-weight: 700; text-decoration: none; }

nav { display: flex; flex-wrap: wrap; gap: 16px; }
nav a[aria-current="page"] { font-weight: 700; }

main section { margin: 40px 0; }