.outline-panel {
  width: 0;
  min-width: 0;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 0px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.2s ease, border-right-width 0.2s ease;
}

.outline-panel--open {
  width: 160px;
  border-right-width: 1px;
}

.outline-header {
  padding: 14px 12px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  flex-shrink: 0;
}

.outline-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.outline-empty {
  padding: 12px 12px;
  font-size: 11px;
  font-family: var(--font-sans);
  color: var(--text-muted);
  opacity: 0.5;
}

/* Base item style — reset button defaults */
.outline-item {
  display: block;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--text-secondary);
  padding: 4px 8px;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.1s, color 0.1s;
}

.outline-item:hover {
  background: rgba(167, 139, 95, 0.12);
  color: var(--text-primary);
}

/* Heading indent levels */
.outline-item--h1 {
  padding-left: 8px;
  font-weight: 600;
  color: var(--text-primary);
}

.outline-item--h2 {
  padding-left: 18px;
}

.outline-item--h3 {
  padding-left: 28px;
  color: var(--text-muted);
  font-size: 10.5px;
}

/* Divider row */
.outline-divider {
  padding-left: 8px;
  color: var(--text-muted);
  opacity: 0.5;
  letter-spacing: 0.05em;
  font-size: 10px;
}

.outline-divider:hover {
  opacity: 1;
}
