:root {
  --bs-body-font-family: var(--font-sans);
  --bs-body-bg: var(--c-bg);
  --bs-body-color: var(--c-text);

  --bs-border-radius: var(--r-sm);
  --bs-border-radius-lg: var(--r-md);
  --bs-border-radius-xl: var(--r-lg);
  --bs-border-color: var(--c-border);

  --bs-primary: var(--c-primary);
  --bs-link-color: var(--c-link);
  --bs-body-font-size: var(--text-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  white-space: nowrap;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  min-height: var(--tap-min);
  font-weight: 600;
}

.btn .btn-icon {
  width: 16px;
  height: 16px;
  max-width: 16px;
  max-height: 16px;
  flex: 0 0 16px;
  display: inline-block;
  filter: var(--c-icon-filter, brightness(0));
}

.btn.btn-sm .btn-icon {
  width: 14px;
  height: 14px;
  max-width: 14px;
  max-height: 14px;
  flex-basis: 14px;
}

/* Primary button icons always contrast against the dark button surface */
.btn-primary .btn-icon {
  filter: brightness(0) invert(1);
}

.btn-icon-only {
  position: relative;
  min-width: 32px;
  width: 32px;
  padding: 6px;
}

.btn-icon-only::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 6px);
  transform: translateX(-50%);
  background: var(--c-text);
  color: var(--c-surface);
  border-radius: var(--r-sm);
  padding: 4px 8px;
  font-size: var(--text-xs);
  line-height: 1;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-1) var(--ease), visibility var(--dur-1) var(--ease);
  z-index: calc(var(--z-popover) + 1);
}

.btn-icon-only:hover::after,
.btn-icon-only:focus-visible::after {
  opacity: 1;
  visibility: visible;
}

.btn-primary {
  background: linear-gradient(160deg, var(--c-primary), var(--c-primary-2));
  border: 1px solid var(--c-primary-2);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(160deg, color-mix(in srgb, var(--c-primary) 85%, white), var(--c-primary));
}

.btn-outline-secondary {
  border-color: var(--c-border);
  color: var(--c-text);
}

.form-control,
.form-select {
  min-height: var(--tap-min);
  border-radius: var(--r-sm);
  padding: var(--sp-2) var(--sp-3);
  background-color: var(--c-surface);
  color: var(--c-text);
  border: var(--border-1);
}

/* Theme-aware select chevron — Bootstrap's default is dark and invisible on dark themes */
.form-select {
  background-image: var(--form-select-chevron);
}

.form-control:focus,
.form-select:focus,
.btn:focus {
  box-shadow: var(--focus-ring);
}

/* Theme-aware checkbox and radio inputs */
.form-check-input {
  background-color: var(--c-surface);
  border-color: var(--c-border);
}

.form-check-input:checked {
  background-color: var(--c-primary);
  border-color: var(--c-primary);
}

.form-check-input:focus {
  box-shadow: var(--focus-ring);
  border-color: var(--c-primary);
}

.form-check-label {
  color: var(--c-text);
}