#tool-body {
  --stm-bg: #fff;
  --stm-text: #333;
  --stm-sub: #8a8a8a;
  --stm-border: #e5e5e5;
  --stm-input-bg: #f5f6f7;
  --stm-primary: #1677ff;
  --stm-primary-hover: #3c8cff;
}
.theme-dark-mode #tool-body {
  --stm-bg: #2b2b2e;
  --stm-text: #e6e6e6;
  --stm-sub: #9a9a9a;
  --stm-border: #3d3d40;
  --stm-input-bg: #1f1f22;
  --stm-primary: #1677ff;
  --stm-primary-hover: #3c8cff;
}
#tool-body .stm-card {
  max-width: 520px;
  margin: 0 auto;
  padding: 28px 24px 30px;
  background: var(--stm-bg);
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  text-align: center;
  box-sizing: border-box;
}
#tool-body .stm-emoji {
  font-size: 34px;
  line-height: 1.4;
}
#tool-body .stm-card h2 {
  margin: 8px 0 4px;
  font-size: 20px;
  color: var(--stm-text);
}
#tool-body .stm-tip {
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--stm-sub);
}
#tool-body .stm-input-row {
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}
#tool-body .stm-currency {
  font-size: 20px;
  color: var(--stm-sub);
  margin-right: 10px;
}
#tool-body .stm-input-row input {
  flex: 1;
  min-width: 0;
  height: 44px;
  padding: 0 12px;
  font-size: 22px;
  font-weight: bold;
  text-align: center;
  color: var(--stm-text);
  background: var(--stm-input-bg);
  border: 1px solid var(--stm-border);
  border-radius: 8px;
  outline: none;
  box-sizing: border-box;
}
#tool-body .stm-input-row input:focus {
  border-color: var(--stm-primary);
}
#tool-body .stm-input-row input::-webkit-outer-spin-button,
#tool-body .stm-input-row input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
#tool-body .stm-input-row input[type=number] {
  -moz-appearance: textfield;
}
#tool-body .stm-icon-btn {
  width: 44px;
  height: 44px;
  margin-left: 10px;
  font-size: 17px;
  color: var(--stm-text);
  background: var(--stm-input-bg);
  border: 1px solid var(--stm-border);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
}
#tool-body .stm-icon-btn:hover {
  color: var(--stm-primary);
  border-color: var(--stm-primary);
}
#tool-body .stm-btn-row {
  display: flex;
  justify-content: center;
  gap: 12px;
}
#tool-body .stm-main-btn {
  padding: 10px 26px;
  font-size: 15px;
  color: #fff;
  background: var(--stm-primary);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
#tool-body .stm-main-btn i {
  margin-right: 6px;
}
#tool-body .stm-main-btn:hover {
  background: var(--stm-primary-hover);
}
#tool-body .stm-main-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
#tool-body .stm-main-btn.stm-download {
  color: var(--stm-text);
  background: transparent;
  border: 1px solid var(--stm-border);
}
#tool-body .stm-main-btn.stm-download:hover:not(:disabled) {
  color: var(--stm-primary);
  border-color: var(--stm-primary);
  background: transparent;
}