:root{
  --gap: 10px;
  --booth-size: 90px;
  --accent: #2563eb;
  --muted: #f3f4f6;
  --booked: #e5e7eb;
  --selected: #fef3c7;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  margin:0;
  padding:20px;
  background: #ffffff;
  color:#111827;
  line-height:1.4;
}

header h1{margin:0;font-size:1.4rem}
.lead{color:#374151;margin-top:6px;margin-bottom:18px}

main{
  display:grid;
  grid-template-columns: 1fr 320px;
  gap:20px;
  align-items:start;
}

/* Tablet screens */
@media (max-width: 900px){
  main {
    grid-template-columns: 1fr; 
    gap:16px;
  }
  #cart-section {
    order: 2; /* cart below floor */
  }
  .floor-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}

/* Mobile screens */
@media (max-width: 600px){
  body {
    padding: 12px;
  }
  header h1 {
    font-size: 1.2rem;
  }
  .floor-grid {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 8px;
  }
  .booth {
    min-width: auto;
    min-height: 80px;
  }
  .overlay .price {
    font-size: 0.85rem;
  }
  .add-btn {
    padding: 6px 8px;
    font-size: 0.8rem;
  }
  .cart {
    font-size: 0.9rem;
    padding: 10px;
  }
  .cart-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .cart-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}


/* Floor grid */
.floor-grid{
  display:grid;
  gap:var(--gap);
  background: linear-gradient(180deg,#fff,#f9fafb);
  padding:12px;
  border-radius:8px;
  border:1px solid #e5e7eb;
}

/* Booth */
.booth{
  position:relative;
  min-height:var(--booth-size);
  min-width:var(--booth-size);
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:6px;
  background:white;
  border:1px solid #e6eef8;
  box-shadow: 0 1px 0 rgba(2,6,23,0.02);
  cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease;
  overflow:hidden;
}
.booth:focus-within{outline:3px solid rgba(37,99,235,0.12)}
.booth:hover{transform:translateY(-4px); box-shadow:0 6px 18px rgba(16,24,40,0.06)}

.booth-label{font-weight:600; font-size:0.95rem; color:#0f172a; z-index:1; pointer-events:none}
.overlay{
  position:absolute;
  inset:0;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:8px;
  background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
  opacity:0;
  transform:translateY(8px);
  transition:opacity .18s ease, transform .18s ease;
  text-align:center;
  padding:8px;
}
.booth:hover .overlay, .booth.selected .overlay { opacity:1; transform:translateY(0); }

.price{font-weight:700; font-size:0.95rem}
.add-btn{
  background:var(--accent);
  color:white;
  border:0;
  padding:6px 8px;
  border-radius:6px;
  cursor:pointer;
  font-size:0.85rem;
}
.add-btn:disabled{background:#9ca3af; cursor:not-allowed; opacity:0.9}

/* Booked style */
.booth.booked{
  background:var(--booked);
  color:#6b7280;
  cursor:not-allowed;
  transform:none;
  box-shadow:none;
}
.booked-badge{
  position:absolute;
  top:6px;
  right:6px;
  background:#ef4444;
  color:white;
  padding:3px 6px;
  border-radius:4px;
  font-size:0.72rem;
  font-weight:700;
  z-index:2;
}

/* selected */
.booth.selected{ background:var(--selected); border:1px dashed #f59e0b;}

/* Cart */
.cart{
  background:#fff;
  padding:12px;
  border-radius:8px;
  border:1px solid #e5e7eb;
  box-shadow:0 1px 0 rgba(2,6,23,0.02);
  min-height:120px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.cart-list{list-style:none;padding:0;margin:0;max-height:260px;overflow:auto}
.cart-item{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:8px;
  border-radius:6px;
  background:var(--muted);
  margin-bottom:6px;
  font-weight:600;
}
.remove-btn{
  background:transparent;border:0;color:#ef4444;cursor:pointer;font-weight:700;
}
.cart-footer{display:flex;justify-content:space-between;align-items:center;gap:10px}
.cart-total{font-weight:800;font-size:1.05rem}
.btn{background:#111827;color:white;padding:8px 10px;border-radius:6px;border:0;cursor:pointer}

/* Notice */
#notice{
  position:fixed;
  left:50%;
  transform:translateX(-50%);
  bottom:26px;
  background:#111827;color:white;padding:8px 12px;border-radius:8px;opacity:0;pointer-events:none;
  transition:opacity .2s ease, transform .2s ease;
}
#notice.show{opacity:1; transform:translateX(-50%) translateY(-6px); pointer-events:auto}

/* Total pulse */
@keyframes pulseScale { 0%{transform:scale(1)} 50%{transform:scale(1.08)} 100%{transform:scale(1)} }
#total-price.pulse{ animation: pulseScale .3s ease; display:inline-block; }