/* Only controls that already look like buttons receive this surface. */
html.xixi-liquid-buttons body .xixi-glossy-control:not(.tab-btn){
  border-radius:var(--xixi-button-corner,12px)!important;
  box-shadow:inset 0 2px 1px rgba(255,255,255,.23),
             inset 0 8px 12px rgba(255,255,255,.07),
             inset 0 -2px 2px rgba(12,38,83,.14)!important;
}
html.xixi-liquid-buttons body .xixi-glossy-control:not(.tab-btn):is(.active,[aria-selected="true"],[aria-pressed="true"]){
  box-shadow:inset 0 2px 1px rgba(255,255,255,.30),
             inset 0 8px 12px rgba(255,255,255,.09),
             inset 0 -2px 2px rgba(12,38,83,.17)!important;
}
/* Conversation cards contain several lines of text, so they need a small corner. */
html.xixi-liquid-buttons body .mailbox-conversation.xixi-glossy-control{border-radius:4px!important}