/* Mode tabs (by rate / by sale price / double discount) */
.mode-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}
.mode-tab {
  flex: 1;
  padding: 9px 6px;
  background: #f2f4f7;
  color: #555;
  border: 1px solid #e0e4ea;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  line-height: 1.3;
}
.mode-tab.active {
  background: #0078d4;
  color: #fff;
  border-color: #0078d4;
}

/* Panels: one visible at a time */
.disc-panel { display: none; }
.disc-panel.active { display: block; }

/* Input form */
.form-row input[type=number] {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
  min-width: 0;
}

.form-unit {
  font-size: 13px;
  color: #999;
  flex-shrink: 0;
  width: 20px;
}

/* Result */
.result-main {
  font-size: 32px;
  font-weight: 700;
  color: #0078d4;
  font-family: 'Consolas', monospace;
  line-height: 1.2;
  word-break: break-all;
}
.result-unit {
  font-size: 16px;
  color: #5a9fd4;
  margin-left: 4px;
}
.result-sub {
  margin-top: 10px;
  font-size: 13px;
  color: #666;
  line-height: 1.8;
}
.result-save { color: #107c10; font-weight: 700; }