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

:root {
  --bg: #0f0f13;
  --card: #1a1a24;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --muted: #9ca3af;
  --border: rgba(255,255,255,0.07);
  --white: #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--white);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: #ffffff15;
  backdrop-filter: blur(5px);
  border-bottom: 1px solid var(--border);
}
.nav-logo { display: flex; align-items: center; }
.nav-logo img { height: 2rem; width: auto; object-fit: contain; }
.nav-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.nav-links a:hover,
.nav-links a.active { color: var(--white); }
.nav-links a.active { font-weight: 600; }
.nav-cta {
  background: var(--accent);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border-radius: 0.75rem;
  transition: background 0.2s;
}
.nav-cta:hover { background: var(--accent-hover); }

@media (max-width: 640px) { .nav-links { display: none; } }

/* ── BUTTONS ── */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  font-weight: 600;
  padding: 0.8rem 2rem;
  border-radius: 0.75rem;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-outline {
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.6);
  color: var(--white);
  font-weight: 600;
  padding: 0.8rem 2rem;
  border-radius: 0.75rem;
  transition: background 0.2s, color 0.2s;
}
.btn-outline:hover { background: var(--white); color: var(--accent); }

/* ── TABS (compartido por paquetes y muestras) ── */
.tabs {
  display: flex;
  justify-content: center;
  gap: 4px;
  background: rgba(255,255,255,0.05);
  padding: 4px;
  border-radius: 0.75rem;
  width: fit-content;
  margin: 0 auto 2rem;
}
.tab-btn {
  padding: 0.5rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  background: none;
  border: none;
  color: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.tab-btn:hover { color: var(--white); }
.tab-btn.active { background: var(--white); color: #000; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}
footer a:hover { color: var(--white); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}