/* ==========================================================================
   AI ASSISTANT — floating chat widget
   Fixed bottom-right, above everything except toasts. Reuses existing
   tokens only — no new colours, radii, or type sizes.
   ========================================================================== */

.assistant-widget {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  z-index: 390;
}

/* ---- Floating button --------------------------------------------------- */
.assistant-fab {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  margin-left: auto;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: transform var(--duration-hover) var(--ease-out),
    background-color var(--duration-hover) var(--ease-out);
}

.assistant-fab:hover {
  background: var(--btn-primary-hover);
  transform: scale(1.05);
}

.assistant-fab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.assistant-widget.is-open .assistant-fab {
  transform: scale(0.96);
}

/* ---- Panel --------------------------------------------------------------- */
.assistant-panel {
  display: flex;
  flex-direction: column;
  width: min(380px, calc(100vw - var(--space-8)));
  height: min(560px, calc(100vh - 140px));
  margin-bottom: var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  opacity: 0;
  transform: translateY(8px) scale(0.98);
  transition: opacity var(--duration-theme) var(--ease-in-out),
    transform var(--duration-theme) var(--ease-in-out);
}

.assistant-panel[hidden] {
  display: none;
}

.assistant-widget.is-open .assistant-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.assistant-panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.assistant-panel-title {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

.assistant-panel-subtitle {
  margin-top: 2px;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: var(--leading-normal);
}

.assistant-panel-close {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--duration-hover) var(--ease-out),
    color var(--duration-hover) var(--ease-out);
}

.assistant-panel-close:hover {
  background: var(--hover);
  color: var(--text-primary);
}

/* ---- Messages -------------------------------------------------------------- */
.assistant-messages {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.assistant-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-2);
  margin: auto 0;
  padding: var(--space-4);
  color: var(--text-secondary);
}

.assistant-empty svg { color: var(--accent); }

.assistant-empty-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
}

.assistant-empty-text {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.assistant-examples {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  margin-top: var(--space-1);
}

.assistant-example {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--duration-hover) var(--ease-out),
    color var(--duration-hover) var(--ease-out),
    border-color var(--duration-hover) var(--ease-out);
}

.assistant-example:hover {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.assistant-message {
  max-width: 88%;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  white-space: pre-line;
  word-break: break-word;
}

.assistant-message.is-user {
  align-self: flex-end;
  background: var(--accent);
  color: var(--text-inverse);
  border-bottom-right-radius: var(--radius-sm);
}

.assistant-message.is-assistant {
  align-self: flex-start;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-bottom-left-radius: var(--radius-sm);
}

.assistant-message.is-assistant.is-error {
  background: var(--danger-soft);
  border-color: transparent;
  color: var(--danger);
}

.assistant-sources {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  line-height: 1.6;
}

.assistant-sources a {
  color: var(--accent);
  text-decoration: none;
}

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

.assistant-thinking {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
}

.assistant-thinking-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-tertiary);
  animation: assistant-bounce 1.2s ease-in-out infinite;
}

.assistant-thinking-dot:nth-child(2) { animation-delay: 0.15s; }
.assistant-thinking-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes assistant-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-3px); opacity: 1; }
}

/* ---- Input row ------------------------------------------------------------- */
.assistant-input-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.assistant-input {
  flex: 1 1 auto;
  padding: 9px var(--space-3);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--text-sm);
}

.assistant-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.assistant-send {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: inline-grid;
  place-items: center;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  cursor: pointer;
  transition: background-color var(--duration-hover) var(--ease-out);
}

.assistant-send:hover:not(:disabled) {
  background: var(--btn-primary-hover);
}

.assistant-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 480px) {
  .assistant-widget {
    right: var(--space-4);
    bottom: var(--space-4);
  }

  .assistant-panel {
    width: calc(100vw - var(--space-6));
    height: min(70vh, 560px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .assistant-fab,
  .assistant-panel,
  .assistant-thinking-dot {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}