/* AI reading companion: optional, client-side, BYOK. */
#ai-companion-root [hidden] {
  display: none !important;
}

#ai-companion-root {
  --ai-bg: var(--md-default-bg-color, #ffffff);
  --ai-fg: var(--md-default-fg-color, #1f2328);
  --ai-muted: var(--md-default-fg-color--light, #57606a);
  --ai-border: var(--md-default-fg-color--lightest, #d0d7de);
  --ai-accent: var(--md-primary-fg-color, #4051b5);
  --ai-accent-fg: var(--md-primary-bg-color, #ffffff);
  --ai-user-bg: var(--md-primary-fg-color--light, #e8eaf6);
  --ai-ai-bg: var(--md-default-fg-color--lightest, #f3f4f6);
  font-family: inherit;
  font-size: 0.78rem;
  line-height: 1.5;
}

#ai-fab {
  position: fixed;
  right: 1rem;
  bottom: 5.2rem;
  z-index: 1000;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--ai-border);
  border-radius: 999px;
  background: var(--ai-accent);
  color: var(--ai-accent-fg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  font-weight: 600;
}

#ai-fab:hover {
  filter: brightness(1.06);
}

#ai-panel {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 1000;
  display: none;
  flex-direction: column;
  width: min(420px, calc(100vw - 2rem));
  max-height: min(720px, calc(100vh - 2rem));
  overflow: hidden;
  border: 1px solid var(--ai-border);
  border-radius: 0.75rem;
  background: var(--ai-bg);
  color: var(--ai-fg);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
}

#ai-companion-root.ai-open #ai-panel {
  display: flex;
}

#ai-companion-root.ai-open #ai-fab {
  display: none;
}

.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--ai-border);
  background: var(--ai-bg);
}

.ai-title {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.ai-title strong {
  font-size: 0.88rem;
}

#ai-page-label {
  overflow: hidden;
  color: var(--ai-muted);
  font-size: 0.68rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-header-actions {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.ai-header-actions button,
.ai-actions button,
.ai-form-actions button,
.ai-form button {
  border: 1px solid var(--ai-border);
  border-radius: 0.4rem;
  background: var(--ai-bg);
  color: var(--ai-fg);
  cursor: pointer;
  font: inherit;
}

.ai-header-actions button {
  padding: 0.2rem 0.45rem;
}

#ai-close {
  font-size: 1rem;
  line-height: 1;
}

.ai-setup {
  padding: 0.75rem 0.85rem;
  overflow-y: auto;
}

.ai-setup label {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--ai-muted);
  font-size: 0.7rem;
}

.ai-setup input,
.ai-setup select,
.ai-form textarea {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin-top: 0.2rem;
  padding: 0.42rem 0.5rem;
  border: 1px solid var(--ai-border);
  border-radius: 0.35rem;
  background: var(--ai-bg);
  color: var(--ai-fg);
  font: inherit;
}

.ai-form-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.ai-form-actions button,
.ai-actions button,
.ai-form button {
  padding: 0.35rem 0.6rem;
  font-size: 0.72rem;
}

.ai-form-actions button:first-child {
  border-color: var(--ai-accent);
  background: var(--ai-accent);
  color: var(--ai-accent-fg);
}

.ai-secondary {
  color: var(--ai-muted) !important;
}

.ai-chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
  max-height: calc(100vh - 9rem);
  padding: 0.65rem 0.75rem 0.75rem;
}

.ai-messages {
  flex: 1 1 auto;
  min-height: 10rem;
  max-height: 45vh;
  overflow-y: auto;
  padding-right: 0.15rem;
}

.ai-msg {
  margin-bottom: 0.55rem;
}

.ai-msg-who {
  margin-bottom: 0.15rem;
  color: var(--ai-muted);
  font-size: 0.64rem;
}

.ai-msg-body {
  display: inline-block;
  max-width: 95%;
  padding: 0.5rem 0.6rem;
  border-radius: 0.55rem;
  background: var(--ai-ai-bg);
  white-space: pre-wrap;
  word-break: break-word;
}

.ai-msg-user {
  text-align: right;
}

.ai-msg-user .ai-msg-body {
  background: var(--ai-user-bg);
  text-align: left;
}

.ai-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  padding: 0.5rem 0 0.4rem;
}

.ai-form {
  display: flex;
  gap: 0.4rem;
  align-items: flex-end;
}

.ai-form textarea {
  flex: 1 1 auto;
  resize: vertical;
  min-height: 2.8rem;
}

.ai-form button {
  flex: 0 0 auto;
  border-color: var(--ai-accent);
  background: var(--ai-accent);
  color: var(--ai-accent-fg);
}

.ai-form button:disabled,
.ai-actions button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.ai-hint {
  margin: 0.45rem 0 0;
  color: var(--ai-muted);
  font-size: 0.64rem;
}

.ai-status {
  min-height: 1rem;
  margin: 0.4rem 0 0;
  font-size: 0.68rem;
}

.ai-status-error {
  color: #b42318;
}

.ai-status-ok {
  color: #067647;
}

[data-md-color-scheme="slate"] #ai-companion-root [hidden] {
  display: none !important;
}

#ai-companion-root {
  --ai-user-bg: #26324a;
  --ai-ai-bg: #1c2430;
  --ai-border: #30363d;
}

@media (max-width: 600px) {
  #ai-panel {
    right: 0.5rem;
    bottom: 0.5rem;
    width: calc(100vw - 1rem);
    max-height: calc(100vh - 1rem);
  }

  #ai-fab {
    right: 0.65rem;
    bottom: 4.8rem;
  }

  .ai-chat {
    max-height: calc(100vh - 8rem);
  }

  .ai-messages {
    max-height: 40vh;
  }
}

@media print {
  #ai-companion-root [hidden] {
  display: none !important;
}

#ai-companion-root {
    display: none !important;
  }
}