/* 点击复制：号码本身为正文，按钮仅辅助操作 */
.copy-btn {
  position: relative;
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.1rem 0.45rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.25rem;
  background: #fff;
  color: var(--brand-700);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  vertical-align: middle;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 6px);
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  background: var(--brand-900);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  z-index: 20;
  pointer-events: none;
}

.site-footer .copy-btn {
  border-color: #475569;
  background: transparent;
  color: #e2e8f0;
}

.site-footer .copy-btn:hover {
  border-color: #93c5fd;
  color: #fff;
}

.site-footer .copy-tip {
  background: #fff;
  color: var(--brand-900);
}