.upgrade-block{display:grid;gap:10px}
.upgrade-btn{width:100%;border:1px solid rgba(255,216,106,.32);border-radius:16px;background:linear-gradient(145deg,rgba(255,216,106,.18),rgba(255,124,70,.12));padding:12px 10px;cursor:pointer;font-weight:1000;line-height:1.2}
.upgrade-btn:not(:disabled):hover{border-color:rgba(255,216,106,.72);filter:brightness(1.08)}
.upgrade-note{margin:0;color:var(--muted);font-size:12px;line-height:1.45}
.unit{position:relative}
.unit[data-level]:not([data-level="0"]):after{content:'+' attr(data-level);position:absolute;right:6px;bottom:5px;min-width:24px;padding:2px 5px;border-radius:999px;background:rgba(0,0,0,.48);border:1px solid rgba(255,255,255,.24);font-size:10px;color:#fff;line-height:1.1;box-shadow:0 4px 10px rgba(0,0,0,.22)}
.sprite-card[data-level]:not([data-level="0"]):after{right:5px;bottom:5px;z-index:3}