.chat-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: var(--chat-accent-color);
  border: none;
  box-shadow: var(--md-shadow-z2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1000;
  color: var(--chat-accent-contrast-color);
}
.chat-fab-icon svg { width: 32px; height: 32px; }

.chat-window {
  position: fixed;
  right: 24px;
  bottom: 120px;
  width: 340px;
  height: 460px;
  max-height: calc(100vh - 120px);
  border-radius: 12px;
  box-shadow: var(--md-shadow-z3);
  display: none;
  flex-direction: column;
  overflow: hidden;
  z-index: 1001;
  background: var(--md-default-bg-color);
  border: 1px solid var(--md-default-fg-color--lightest);
}
.chat-window.chat-open { display: flex; }
.chat-window.chat-window--expanded {
  width: min(820px, calc(100vw - 48px));
  height: min(80vh, 720px);
  max-height: calc(100vh - 48px);
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  font-weight: 600;
  font-size: 14px;
}
.chat-header-icon svg { display: block; width: 18px; height: 18px; }
.chat-header-title { flex: 1; }
.chat-header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  border-radius: 4px;
  color: inherit;
  cursor: pointer;
  padding: 4px;
}
.chat-header-btn svg { display: block; width: 16px; height: 16px; }
.chat-header-btn:hover { background: rgba(255, 255, 255, .15); }

.chat-disclaimer {
  padding: 8px 12px;
  font-size: 11.5px;
  line-height: 1.4;
  color: var(--md-default-fg-color--light);
  background: var(--md-code-bg-color);
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
}
.chat-disclaimer a { color: var(--md-accent-fg-color); }
.chat-disclaimer p { margin: 0; }
.chat-window--expanded .chat-disclaimer-break { display: none; }

.chat-header input {
  width: 90px;
  font-size: 11px;
  padding: 4px 8px;
  border: none;
  border-radius: 6px;
  color: var(--md-default-fg-color);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.5;
}

.chat-msg { max-width: 90%; padding: 8px 12px; border-radius: 10px; }
.chat-msg p:first-child { margin-top: 0; }
.chat-msg p:last-child { margin-bottom: 0; }
.chat-msg-user {
  align-self: flex-end;
  background: var(--chat-accent-color);
  color: var(--chat-accent-contrast-color);
  border-bottom-right-radius: 3px;
}
.chat-msg-bot {
  align-self: flex-start;
  background: var(--md-code-bg-color);
  border-bottom-left-radius: 3px;
}
.chat-msg-bot pre {
  overflow-x: auto;
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--md-default-bg-color);
  font-size: 12px;
}
.chat-msg-bot code { font-size: 12px; }
.chat-cite { color: var(--md-accent-fg-color); font-weight: 700; cursor: pointer; }
.chat-error { color: var(--chat-error-color); }
.chat-thinking { color: var(--md-default-fg-color--light); font-style: italic; }

.chat-sources {
  margin-top: 6px;
  font-size: 11.5px;
}
.chat-sources summary { cursor: pointer; color: var(--md-default-fg-color--light); }
.chat-sources a {
  display: block;
  padding: 5px 8px;
  margin-top: 4px;
  border-radius: 6px;
  background: var(--md-default-bg-color);
  color: var(--md-accent-fg-color);
  text-decoration: none;
}

.chat-input-row {
  display: flex;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--md-default-fg-color--lightest);
}
.chat-input-row textarea {
  flex: 1;
  resize: none;
  max-height: 100px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--md-default-fg-color--lightest);
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  font: inherit;
  font-size: 13px;
}
.chat-input-row textarea:focus { outline: 2px solid var(--md-primary-fg-color); border-color: transparent; }
.chat-input-row button {
  border: none;
  border-radius: 8px;
  background: var(--chat-accent-color);
  color: var(--chat-accent-contrast-color);
  padding: 0 14px;
  cursor: pointer;
  font-size: 16px;
}
.chat-input-row button:disabled { opacity: .5; cursor: default; }

/* Extra glow so the fab still pops against the slate background even
   though it now shares the same accent color as the rest of the page. */
[data-md-color-scheme="slate"] .chat-fab {
  box-shadow: var(--md-shadow-z2), 0 2px 12px rgba(0, 185, 228, .35);
}