.pad {
  height: 240px; border-radius: 16px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 1.3rem; font-weight: 700; cursor: pointer; user-select: none;
  margin-bottom: 18px; text-align: center; padding: 20px;
}
.pad.wait { background: #64748b; }
.pad.ready { background: #dc2626; }
.pad.go { background: #16a34a; }
.pad.result { background: var(--primary); }