/* ============================================================
   Chat Widget — BookPicks AI
   Uses CSS custom properties from variables.css
   ============================================================ */

/* ---------- Widget container ---------- */
.chat-widget {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: var(--z-chat);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-md);
}

/* ---------- Floating trigger button ---------- */
.chat-trigger {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-gold);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(196, 163, 90, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  flex-shrink: 0;
}

.chat-trigger:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(196, 163, 90, 0.5);
}

.chat-trigger:active {
  transform: scale(0.96);
}

.chat-trigger svg {
  width: 24px;
  height: 24px;
  color: #0A0A0F;
  flex-shrink: 0;
}

/* Icon swap: book shown when closed, ✕ shown when open */
.chat-trigger__icon--close {
  display: none;
}

.chat-widget--open .chat-trigger__icon--book {
  display: none;
}

.chat-widget--open .chat-trigger__icon--close {
  display: block;
}

/* ---------- Chat panel ---------- */
.chat-panel {
  width: 360px;
  max-height: 560px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-elevated);
  display: flex;
  flex-direction: column;
  overflow: hidden;

  /* Hidden by default — slide in when open */
  opacity: 0;
  transform: translateY(16px) scale(0.97);
  pointer-events: none;
  transition:
    opacity var(--transition-base),
    transform var(--transition-base);
}

.chat-widget--open .chat-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

/* ---------- Panel header ---------- */
.chat-panel__header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
}

.chat-panel__avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-gold-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-panel__avatar svg {
  width: 18px;
  height: 18px;
  color: var(--accent-gold);
}

.chat-panel__title-group {
  flex: 1;
  min-width: 0;
}

.chat-panel__title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--text-heading);
  font-weight: 500;
}

.chat-panel__subtitle {
  font-size: var(--text-xs);
  color: var(--text-label);
  margin-top: 2px;
}

.chat-panel__close {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-label);
  flex-shrink: 0;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.chat-panel__close:hover {
  color: var(--text-heading);
  background: var(--bg-card-hover);
}

.chat-panel__close svg {
  width: 16px;
  height: 16px;
}

/* ---------- Messages area ---------- */
.chat-panel__messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  scroll-behavior: smooth;
}

.chat-panel__messages::-webkit-scrollbar {
  width: 4px;
}

.chat-panel__messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-panel__messages::-webkit-scrollbar-thumb {
  background: var(--border-card);
  border-radius: 2px;
}

/* ---------- Message bubbles ---------- */
.chat-message {
  display: flex;
  gap: var(--space-sm);
  max-width: 100%;
}

.chat-message--user {
  flex-direction: row-reverse;
}

.chat-message__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-gold-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.chat-message__avatar svg {
  width: 14px;
  height: 14px;
  color: var(--accent-gold);
}

.chat-message--user .chat-message__avatar {
  background: var(--bg-card-hover);
}

.chat-message--user .chat-message__avatar svg {
  color: var(--text-body);
}

.chat-message__bubble {
  max-width: calc(100% - 44px);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-body);
}

.chat-message--ai .chat-message__bubble {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top-left-radius: var(--radius-sm);
}

.chat-message--user .chat-message__bubble {
  background: var(--accent-gold-dim);
  border: 1px solid rgba(196, 163, 90, 0.2);
  border-top-right-radius: var(--radius-sm);
  color: var(--text-heading);
}

/* ---------- Typing indicator ---------- */
.chat-typing {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.chat-typing__dots {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  border-top-left-radius: var(--radius-sm);
}

.chat-typing__dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-label);
  animation: chat-dot-pulse 1.2s ease-in-out infinite;
}

.chat-typing__dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.chat-typing__dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes chat-dot-pulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.9); }
  40% { opacity: 1; transform: scale(1.1); }
}

/* ---------- Book cards ---------- */
.chat-book-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
  width: 100%;
}

.chat-book-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  text-decoration: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.chat-book-card:hover {
  border-color: rgba(196, 163, 90, 0.3);
  background: var(--bg-card-hover);
}

.chat-book-card__cover {
  width: 36px;
  height: 54px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
  background: var(--bg-primary);
}

.chat-book-card__cover--placeholder {
  width: 36px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-book-card__info {
  flex: 1;
  min-width: 0;
}

.chat-book-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  color: var(--text-heading);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.chat-book-card__genre {
  font-size: 10px;
  color: var(--accent-gold);
  margin-top: 3px;
  font-family: var(--font-en);
  letter-spacing: 0.02em;
}

.chat-book-card__arrow {
  width: 14px;
  height: 14px;
  color: var(--text-label);
  flex-shrink: 0;
}

/* ---------- Footer (input area) ---------- */
.chat-panel__footer {
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.chat-panel__charcount {
  display: none;
  width: 100%;
  text-align: right;
  font-size: 0.7rem;
  color: var(--text-label);
  padding: 0 var(--space-xs);
}

.chat-panel__input {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-sm) var(--space-md);
  color: var(--text-heading);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.5;
  resize: none;
  min-height: 40px;
  max-height: 120px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.chat-panel__input::placeholder {
  color: var(--text-label);
}

.chat-panel__input:focus {
  border-color: rgba(196, 163, 90, 0.4);
}

.chat-panel__input:focus-visible {
  outline: none;
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 1px var(--accent-gold);
}

.chat-panel__send {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--accent-gold);
  color: #0A0A0F;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.chat-panel__send:hover:not(:disabled) {
  background: var(--accent-gold-light);
  transform: scale(1.05);
}

.chat-panel__send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.chat-panel__send svg {
  width: 16px;
  height: 16px;
}

/* ---------- Mobile adjustments ---------- */
@media (max-width: 768px) {
  .chat-widget {
    bottom: 24px;
    right: 24px;
  }

  .chat-panel {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: 144px;
    width: auto;
    max-height: 60vh;
  }
}