header{
  position:fixed;
  top:0; left:0; right:0;
  padding:12px 14px;
  display:flex;
  align-items:center;
  gap:12px;
  background: linear-gradient(180deg, rgba(9,14,30,.9), rgba(9,14,30,.55));
  backdrop-filter: blur(10px);
  border-bottom:1px solid rgba(255,255,255,.06);
  z-index:20;
}

.wrap{
  position:fixed;
  inset:56px 0 0 0;
  display:grid;
  grid-template-columns: 340px 1fr;
  gap:12px;
  padding:12px;
  z-index:1;
}

aside{
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(17,24,51,.8), rgba(15,22,48,.7));
  border:1px solid rgba(255,255,255,.08);
  box-shadow: var(--shadow);
  overflow:auto;
  padding:12px;
}

main{
  position:relative;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(17,24,51,.25), rgba(15,22,48,.22));
  border:1px solid rgba(255,255,255,.08);
  box-shadow: var(--shadow);
  overflow:hidden;
}

.canvas{
  position:absolute;
  inset:0;
  cursor:grab;
  user-select:none;
}
.canvas.grabbing{ cursor:grabbing; }

.world{
  position:absolute;
  left:0; top:0;
  transform-origin: 0 0;
  width: 5000px;
  height: 4000px;
}

svg#links{
  position:absolute;
  inset:0;
  overflow:visible;
  pointer-events:none;
}

/* Mobile layout: main full screen, aside becomes bottom sheet */
@media (max-width: 900px){
  .wrap{
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
    padding: 8px;
  }

  aside{
    position: fixed;
    left: 8px;
    right: 8px;
    bottom: 8px;
    top: auto;
    max-height: 46vh;
    z-index: 30;
    border-radius: 18px;
    transform: translateY(calc(100% + 12px));
    transition: transform .18s ease;
  }

  body.panel-open aside{
    transform: translateY(0);
  }

  main{
    height: calc(100vh - 56px - 16px);
  }

  header{
    flex-wrap: wrap;
    gap: 10px;
  }

  .hint{
    width: 100%;
    margin-left: 0;
    justify-content: flex-start;
  }
}

/* Visibility helpers */
.desktop-only { display: block; }
.mobile-only { display: none; }

/* Mobile: hide desktop UI, show mobile UI */
@media (max-width: 900px){
  .desktop-only { display: none !important; }
  .mobile-only { display: flex !important; }

  .wrap{
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 8px;
  }

  main{
    height: calc(100vh - 56px - 8px); /* header + padding */
  }
}