/* Base Button Styling */
.btn-3d-attachment {
  --btn-color: #2563eb;       /* Primary blue */
  --btn-shadow: #1d4ed8;      /* Darker blue for 3D edge */
  
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--btn-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  outline: none;
  user-select: none;
  
  /* The core 3D depth effect */
  transform: translateY(-4px);
  box-shadow: 0 4px 0 0 var(--btn-shadow);
  
  /* Smooth transition for hover releases */
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.1s ease;
}

/* Icon dimensions */
.btn-3d-attachment .icon {
  width: 60px;
  height: 60px;
}

/* Hover State - Slightly raises up & brightens color */
.btn-3d-attachment:hover {
  background-color: #3b82f6;
  transform: translateY(-6px);
  box-shadow: 0 6px 0 0 var(--btn-shadow);
}

/* Click/Active State - Simulates pushing the physical button down */
.btn-3d-attachment:active {
  background-color: var(--btn-color);
  transform: translateY(0px);
  box-shadow: 0 0px 0 0 var(--btn-shadow);
}

/* Focus indicator for better accessibility */
.btn-3d-attachment:focus-visible {
  outline: 3px solid #93c5fd;
  outline-offset: 2px;
}