/* Base compartida por la portada y las páginas interiores de APOD Explorer */
:root {
  --bg: #070b18;
  --bg-2: #0d1430;
  --ink: #eef1fb;
  --muted: #97a0c3;
  --accent: #7fb3ff;
  --card: rgba(255, 255, 255, .045);
  --card-border: rgba(255, 255, 255, .09);
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, system-ui, sans-serif;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1100px 520px at 50% -12%, #23306b 0%, transparent 62%),
    radial-gradient(700px 420px at 88% 28%, rgba(122, 82, 170, .22) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 55%);
  min-height: 100vh;
  line-height: 1.6;
}
a { color: var(--accent); }

/* Barra superior: enlace de vuelta (opcional) + selector de idioma */
nav.top {
  display: flex; justify-content: space-between; align-items: center;
  gap: 1rem; margin-bottom: 2.4rem; font-size: .9rem;
}
nav.top .back {
  color: var(--ink); text-decoration: none; font-weight: 600;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 999px; padding: .45rem 1rem; transition: background .15s;
}
nav.top .back:hover { background: rgba(255, 255, 255, .09); }
.lang-toggle { display: flex; gap: .4rem; margin-left: auto; }
.lang-toggle a {
  color: var(--muted); text-decoration: none; font-size: .85rem; font-weight: 600;
  padding: .3rem .7rem; border-radius: 999px; border: 1px solid transparent;
  transition: color .15s, background .15s;
}
.lang-toggle a:hover { color: var(--ink); }
.lang-toggle a[aria-current="true"] {
  color: var(--ink); border-color: var(--card-border); background: var(--card);
}

footer {
  margin-top: 3.5rem; padding-top: 1.4rem; border-top: 1px solid var(--card-border);
  color: var(--muted); font-size: .85rem; text-align: center;
}
footer a { color: var(--accent); text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}