/* Theme toggle — practice (dark) and workbook (light) */
.theme-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border, #888);
  border-radius: 8px;
  background: var(--bg2, #fff);
  color: var(--text, #333);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.theme-toggle--bar {
  width: 36px;
  height: 36px;
  font-size: 16px;
  align-self: center;
}
.tab-bar-trailing {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  margin-left: auto;
  padding: 0 12px 0 4px;
}
.theme-toggle:hover {
  border-color: var(--border2, #666);
  transform: translateY(-1px);
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--gold, #4a7eb8);
  outline-offset: 2px;
}
.theme-toggle::before {
  display: block;
  content: '☀';
}
.theme-toggle[data-theme='workbook']::before {
  content: '☾';
}

body.theme-practice .theme-toggle {
  border-radius: 4px;
  background: var(--panel-raised);
  color: var(--ink-soft);
  border-color: var(--border2);
}
body.theme-practice .theme-toggle:hover {
  color: var(--chrome);
  border-color: var(--chrome-dim);
}

body.theme-workbook .theme-toggle {
  border-radius: 10px;
  background: var(--paper-white);
  box-shadow: 0 2px 6px rgba(61, 79, 98, 0.08);
}
body.theme-workbook .theme-toggle:hover {
  background: var(--paper-blue);
  border-color: var(--wb-blue);
  color: var(--wb-blue);
}