/* Chat widget — Material Design tokens from mkdocs-material */
#chat-toggle-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--md-primary-fg-color, #6366f1);
  color: white;
  border: none;
  box-shadow: var(--md-shadow-z2, 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06));
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

#chat-toggle-btn:hover {
  transform: scale(1.05);
  background-color: var(--md-accent-fg-color, #4f46e5);
}

#chat-widget {
  position: fixed;
  bottom: 90px;
  right: 24px;
  width: 350px;
  height: 500px;
  background-color: var(--md-default-bg-color, #fff);
  border-radius: 16px;
  box-shadow: var(--md-shadow-z2, 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1));
  display: flex;
  flex-direction: column;
  z-index: 1000;
  border: 1px solid var(--md-divider-color, #e5e7eb);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.chat-header {
  padding: 16px;
  border-bottom: 1px solid var(--md-divider-color, #f3f4f6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--md-default-bg-color--container, #f8fafc);
}

.chat-header h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--md-default-fg-color, #1f2937);
}

.chat-header button {
  background: none;
  border: none;
  color: var(--md-default-fg-color--medium, #6b7280);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-header button:hover {
  background-color: var(--md-default-bg-color--light, #f3f4f6);
  color: var(--md-default-fg-color, #1f2937);
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-input-container {
  padding: 16px;
  border-top: 1px solid var(--md-divider-color, #f3f4f6);
  display: flex;
  gap: 12px;
  background-color: var(--md-default-bg-color--container, #f8fafc);
}

#chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--md-input-border-color, var(--md-default-fg-color--lightest, #e5e7eb));
  border-radius: 12px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s ease;
  background-color: var(--md-default-bg-color, #fff);
  color: var(--md-default-fg-color, #1f2937);
}

#chat-input:focus {
  border-color: var(--md-primary-fg-color, #6366f1);
}

#chat-input::placeholder {
  color: var(--md-default-fg-color--medium, #9ca3af);
}

.chat-bubble {
  display: flex;
  flex-direction: row-reverse;
  align-items: flex-start;
  max-width: 80%;
}

.chat-bubble.user {
  margin-left: auto;
}

.chat-bubble.ai {
  margin-right: auto;
}

.chat-bubble-content {
  padding: 12px 16px;
  border-radius: 16px 16px 4px 16px;
  line-height: 1.5;
  font-size: 0.95rem;
  word-wrap: break-word;
  max-width: 100%;
}

.chat-bubble.user .chat-bubble-content {
  background-color: var(--md-primary-fg-color, #6366f1);
  color: white;
  border-radius: 16px 16px 4px 16px;
}

.chat-bubble.ai .chat-bubble-content {
  background-color: var(--md-default-fg-color--light, #f3f4f6);
  color: var(--md-default-fg-color, #1f2937);
  border-radius: 16px 16px 16px 4px;
}

.chat-sources {
  font-size: 0.75rem;
  color: var(--md-default-fg-color--medium, #6b7280);
  margin-top: 4px;
  padding-left: 12px;
}

.chat-sources a {
  color: var(--md-accent-fg-color, #526cfe);
  text-decoration: none;
}

.chat-sources a:hover {
  text-decoration: underline;
}

@keyframes typing {
  0%, 80%, 100% { opacity: 0.3; }
  40% { opacity: 1; }
}