:root{
  --primary:#4f46e5; /* morado tech */
  --accent:#7c83ff;
  --bg:#f5f7fa;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --danger:#ef4444;
  --success:#10b981;
}

/* dark theme */
:root[data-theme="dark"]{
  --bg:#0f1720;
  --card:#111827;
  --text:#e6eef8;
  --muted:#94a3b8;
}

/* reset */
*{box-sizing:border-box}
body{margin:0;font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;background:var(--bg);color:var(--text);}

/* NAV */
.nav{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background:var(--card);box-shadow:0 2px 6px rgba(2,6,23,.04)}
.logo{font-weight:700;color:var(--primary);text-decoration:none;font-size:20px}
.nav-cats a{margin-left:12px;color:var(--muted);text-decoration:none}

/* hero */
.hero{padding:36px 20px;text-align:center}
.hero h1{margin:0;font-size:30px}
.hero p{color:var(--muted)}

/* controls */
.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:center;padding:10px 16px}
.controls input, .controls select{padding:10px;border:1px solid #e6edf3;border-radius:8px}

/* product grid */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px;padding:20px;max-width:1200px;margin:0 auto}
.product-card{background:var(--card);border-radius:12px;padding:12px;box-shadow:0 4px 18px rgba(2,6,23,0.06);cursor:pointer;transition:transform .12s}
.product-card:hover{transform:translateY(-6px)}
.product-card img{width:100%;height:160px;object-fit:cover;border-radius:8px}
.product-card h3{margin:10px 0 6px;font-size:16px}
.price{color:var(--primary);font-weight:700}

/* product detail */
.product-detail{max-width:900px;margin:20px auto;padding:20px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.product-detail img{width:100%;border-radius:12px}
.product-detail .info{padding:8px}

/* cart */
.cart-page{display:flex;gap:20px;max-width:1100px;margin:20px auto;padding:10px}
#cartItems{flex:2}
.cart-summary{flex:1;background:var(--card);padding:16px;border-radius:12px;box-shadow:0 6px 24px rgba(2,6,23,0.06)}
.cart-item{display:flex;gap:12px;align-items:center;padding:10px;border-bottom:1px solid #eef2f8}
.cart-item img{width:70px;height:60px;object-fit:cover;border-radius:8px}
.qty-controls{display:flex;gap:6px;align-items:center}
.btn{padding:8px 12px;border-radius:8px;border:none;background:var(--primary);color:white;cursor:pointer}
.btn.ghost{background:transparent;color:var(--text);border:1px solid #dbeafe}
.btn.small{padding:6px 8px;font-size:14px}
.btn.danger{background:var(--danger)}
.btn.whatsapp{background:#25D366}
.note{margin-top:10px;color:var(--muted);font-size:13px}
.footer{padding:20px;text-align:center;color:var(--muted);margin-top:30px}

/* responsive */
@media (max-width:800px){
  .product-detail{grid-template-columns:1fr; padding:10px}
  .cart-page{flex-direction:column;padding:10px}

  /* BOTÓN FLOTANTE WHATSAPP */
.whatsapp-floating {
  position: fixed;
  bottom: 25px;
  right: 25px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: #25D366;
  color: white;
  padding: 12px 15px;
  border-radius: 50px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.5s ease;
  z-index: 9999;
}

.whatsapp-floating.show {
  opacity: 1;
  visibility: visible;
}

.whatsapp-floating .wa-icon {
  width: 32px;
  height: 32px;
}

.whatsapp-floating .wa-text {
  font-size: 16px;
  font-weight: bold;
}

.hidden {
  display: none;
}