.em-icon-btn {
  
  --em-ibtn-bg: var(--bg-input, #25252a);
  --em-ibtn-bg-hover: var(--bg-hover, #2a2a32);
  --em-ibtn-bg-active: var(--bg-sunken, #1e1e26);
  --em-ibtn-border: var(--border, #333);
  --em-ibtn-border-hover: var(--border-strong, #444);

  
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 24px;
  min-width: 30px;
  padding: 0 7px;
  border-radius: var(--radius-sm, 4px);
  cursor: pointer;
  background: var(--em-ibtn-bg);
  border: 1px solid var(--em-ibtn-border);
  color: var(--text-secondary, #ccc);
  font: inherit;
  line-height: 1;
  transition: background 0.1s ease, border-color 0.1s ease, color 0.1s ease;
}


.em-icon-btn[hidden] {
  display: none;
}

a.em-icon-btn,
a.em-icon-btn:hover {
  text-decoration: none;
}

.em-icon-btn > svg {
  display: block;
  width: 14px;
  height: 14px;
}

.em-icon-btn:hover:not(:disabled) {
  background: var(--em-ibtn-bg-hover);
  border-color: var(--em-ibtn-border-hover);
  color: var(--text, #e0e0e0);
}

.em-icon-btn:active:not(:disabled) {
  background: var(--em-ibtn-bg-active);
}

.em-icon-btn:focus-visible {
  outline: 2px solid var(--accent, #5b8def);
  outline-offset: 2px;
}


.em-icon-btn[aria-expanded="true"] {
  background: var(--accent-tint-selected, rgba(91, 141, 239, 0.18));
  border-color: var(--accent, #5b8def);
  color: var(--accent, #5b8def);
}


.em-icon-btn[aria-pressed="true"] {
  background: var(--accent-tint-selected, rgba(91, 141, 239, 0.18));
  border-color: var(--accent, #5b8def);
  color: var(--accent, #5b8def);
}


.em-icon-btn[aria-expanded="true"]:hover:not(:disabled),
.em-icon-btn[aria-pressed="true"]:hover:not(:disabled) {
  background: var(--accent-tint-strong, rgba(91, 141, 239, 0.25));
  border-color: var(--accent, #5b8def);
  color: var(--accent, #5b8def);
}

.em-icon-btn:disabled {
  opacity: 0.4;
  cursor: default;
}




.chart-help-menu {
  position: relative;
  display: inline-flex;
}
.chart-help-btn {
  font-weight: bold;
}

.em-icon-btn--ghost {
  --em-ibtn-bg: none;
  --em-ibtn-bg-hover: rgba(255, 255, 255, 0.07);
  --em-ibtn-bg-active: rgba(255, 255, 255, 0.03);
  --em-ibtn-border: transparent;
  --em-ibtn-border-hover: transparent;
  color: var(--text-dim, #888);
}

.em-icon-btn--ghost[aria-expanded="true"] {
  background: none;
  border-color: transparent;
  color: var(--accent, #5b8def);
}

.em-icon-btn--ghost[aria-pressed="true"] {
  background: none;
  border-color: transparent;
  color: var(--accent, #5b8def);
}


.em-icon-btn--ghost[aria-expanded="true"]:hover:not(:disabled),
.em-icon-btn--ghost[aria-pressed="true"]:hover:not(:disabled) {
  background: var(--em-ibtn-bg-hover);
  border-color: transparent;
  color: var(--accent, #5b8def);
}




.heading-edit-btn {
  min-width: 0;
  height: 16px;
  padding: 0 3px;
  margin: -1px 0 -1px 6px;
  vertical-align: -1.5px;
}




.em-icon-btn--lg {
  height: 28px;
  min-width: 28px;
  padding: 0 5px;
}

.em-icon-btn--lg > svg {
  width: 16px;
  height: 16px;
}

@media (prefers-reduced-motion: reduce) {
  .em-icon-btn { transition: none; }
}