/* ==========================================
   龙虾找车 - AI选车页样式 (ai.css)
   ========================================== */

/* --- AI Experience Section --- */
.ai-experience {
  padding: 60px 0 80px;
  background: var(--white);
}

.ai-exp-grid {
  display: grid;
  grid-template-columns: 5fr 4fr;
  gap: 48px;
  align-items: start;
}

/* Chat Interface */
.ai-chat-interface {
  background: #fafbfc;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.ai-chat-topbar {
  background: var(--white);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
}

.ai-chat-topbar-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.ai-chat-topbar-info { flex: 1; }

.ai-chat-topbar-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.ai-chat-topbar-status {
  font-size: 12px;
  color: #10B981;
  display: flex;
  align-items: center;
  gap: 4px;
}

.ai-chat-topbar-status::before {
  content: '';
  width: 6px;
  height: 6px;
  background: #10B981;
  border-radius: 50%;
}

.ai-chat-body {
  padding: 20px;
  min-height: 480px;
  max-height: 560px;
  overflow-y: auto;
}

.ai-msg {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.ai-msg.user {
  flex-direction: row-reverse;
}

.ai-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.ai-msg.bot .ai-msg-avatar {
  background: var(--primary-gradient);
}

.ai-msg.user .ai-msg-avatar {
  background: #E5E6EB;
}

.ai-msg-content {
  max-width: 75%;
}

.ai-msg-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.7;
}

.ai-msg.bot .ai-msg-bubble {
  background: var(--white);
  border: 1px solid #eee;
  border-bottom-left-radius: 4px;
  color: var(--text-primary);
}

.ai-msg.user .ai-msg-bubble {
  background: var(--primary-gradient);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.ai-msg-time {
  font-size: 11px;
  color: var(--text-weak);
  margin-top: 4px;
  padding: 0 4px;
}

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

/* Car recommendation cards in chat */
.ai-car-rec {
  background: var(--white);
  border: 1px solid #eee;
  border-radius: var(--radius-md);
  padding: 14px;
  margin-top: 8px;
  transition: var(--transition);
  cursor: pointer;
}

.ai-car-rec:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(232, 69, 42, 0.1);
}

.ai-car-rec + .ai-car-rec {
  margin-top: 8px;
}

.ai-car-rec-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 6px;
}

.ai-car-rec-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.ai-car-rec-price {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

.ai-car-rec-meta {
  font-size: 12px;
  color: var(--text-weak);
}

.ai-car-rec-tags {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.ai-car-rec-tag {
  padding: 2px 8px;
  background: #f5f5f5;
  border-radius: 4px;
  font-size: 11px;
  color: var(--text-secondary);
}

.ai-car-rec-tag.highlight {
  background: var(--primary-light);
  color: var(--primary);
}

/* Typing indicator */
.ai-typing {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 16px;
}

.ai-typing span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-weak);
  animation: typing-bounce 1.4s infinite;
}

.ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* Chat input */
.ai-chat-input-area {
  padding: 16px 20px;
  background: var(--white);
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
  align-items: center;
}

.ai-chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  background: #fafbfc;
  transition: var(--transition);
}

.ai-chat-input:focus {
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(232, 69, 42, 0.1);
}

.ai-chat-send {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  transition: var(--transition);
}

.ai-chat-send:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-primary);
}

/* Quick prompts */
.ai-chat-quick {
  padding: 0 20px 16px;
  background: var(--white);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.ai-chat-quick-tag {
  padding: 6px 14px;
  background: #f5f5f5;
  border-radius: var(--radius-full);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.ai-chat-quick-tag:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: rgba(232, 69, 42, 0.2);
}

/* AI Capabilities */
.ai-capabilities { }

.ai-cap-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.ai-cap-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.ai-cap-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.ai-cap-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: #fafbfc;
  border-radius: var(--radius-md);
  border: 1px solid #eee;
  transition: var(--transition);
}

.ai-cap-item:hover {
  border-color: rgba(232, 69, 42, 0.15);
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.ai-cap-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.ai-cap-text h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.ai-cap-text p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.ai-cap-cta {
  margin-top: 32px;
}

/* --- AI Advantages --- */
.ai-advantages {
  background: var(--bg);
}

.ai-adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-adv-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  border: 1px solid transparent;
  transition: var(--transition);
}

.ai-adv-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(232, 69, 42, 0.1);
}

.ai-adv-num {
  font-size: 48px;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.ai-adv-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.ai-adv-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Hot Brands --- */
.hot-brands {
  background: var(--white);
}

.brand-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.brand-item {
  text-align: center;
  padding: 24px 16px;
  background: #fafbfc;
  border-radius: var(--radius-md);
  border: 1px solid #eee;
  transition: var(--transition);
  cursor: pointer;
}

.brand-item:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(232, 69, 42, 0.1);
  transform: translateY(-4px);
}

.brand-logo {
  font-size: 32px;
  margin-bottom: 8px;
}

.brand-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.brand-count {
  font-size: 12px;
  color: var(--text-weak);
  margin-top: 2px;
}

/* Price Range Tags */
.price-ranges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
  justify-content: center;
}

.price-tag {
  padding: 10px 24px;
  background: #fafbfc;
  border: 1px solid #eee;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.price-tag:hover {
  background: var(--primary-light);
  border-color: rgba(232, 69, 42, 0.3);
  color: var(--primary);
}

/* --- Responsive: AI Page --- */
@media (max-width: 1199px) {
  .ai-exp-grid { grid-template-columns: 1fr; }
  .ai-chat-interface { position: static; }
  .brand-grid { grid-template-columns: repeat(3, 1fr); }
  .ai-adv-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .ai-chat-body { min-height: 360px; max-height: 400px; }
  .brand-grid { grid-template-columns: repeat(3, 1fr); }
  .ai-adv-grid { grid-template-columns: 1fr; }
  .ai-cap-title { font-size: 22px; }
  .price-ranges { gap: 8px; }
  .price-tag { padding: 8px 18px; font-size: 13px; }
}