.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 18px;border-radius:10px;border:1px solid var(--btn-bg);
  background:var(--btn-bg);color:var(--btn-text);font-weight:600;cursor:pointer;transition:.18s;width:100%}
.btn:hover{transform:translateY(-1px);filter:brightness(1.05)}
.btn.ghost{background:transparent;color:var(--btn-ghost-text);border-color:var(--line)}
.btn.ghost:hover{background:color-mix(in oklab, var(--accent) 8%, transparent);border-color:var(--accent)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}