/* Estilos base */
:root {
  --bg: #0f172a;
  --fg: #e2e8f0;
  --accent: #22d3ee;
  --muted: #94a3b8;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.container { max-width: 960px; margin: 0 auto; padding: 1.25rem; }
.header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.nav a { color: var(--fg); text-decoration: none; margin-right: .75rem; }
.nav a:hover { color: var(--accent); }

.card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.button {
  background: var(--accent);
  color: #0b1324;
  padding: .6rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}
.button:hover { filter: brightness(1.05); }

.hidden { display: none !important; }