/* ==========================================================================
   AI FAQ Modal — 弹窗样式
   配套 ai-faq.js
   ========================================================================== */

.ai-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 9999;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  animation: ai-fadeIn 0.15s ease;
}
.ai-modal-backdrop.open { display: flex; }

.ai-modal {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.25);
  width: 90%;
  max-width: 600px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: ai-slideUp 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.ai-modal-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line, #e2e8f0);
  font-size: 14px;
  color: #64748b;
}
.ai-modal-header-icon { font-size: 18px; }
.ai-modal-close {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #94a3b8;
  padding: 0;
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
}
.ai-modal-close:hover { color: var(--brand, #0f172a); }

.ai-modal-input-wrap {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line, #e2e8f0);
}
.ai-modal-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 17px;
  font-family: inherit;
  color: var(--brand, #0f172a);
  background: transparent;
  padding: 8px 0;
}
.ai-modal-input::placeholder { color: #cbd5e1; }

.ai-modal-results {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}
.ai-modal-empty {
  padding: 32px 24px;
  text-align: center;
  color: #94a3b8;
  font-size: 14px;
}
.ai-modal-empty strong { color: var(--brand, #0f172a); }

.ai-modal-item {
  display: block;
  padding: 12px 20px;
  text-decoration: none;
  color: var(--brand, #0f172a);
  border-left: 3px solid transparent;
  transition: background 0.1s;
  cursor: pointer;
}
.ai-modal-item:hover,
.ai-modal-item.selected {
  background: #f8fafc;
  border-left-color: var(--accent, #f97316);
}
.ai-modal-item-q {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}
.ai-modal-item-a {
  font-size: 13px;
  color: #64748b;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.ai-modal-item-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  background: #f1f5f9;
  color: #64748b;
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 6px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.ai-modal-fallback {
  padding: 16px 20px;
  border-top: 1px solid var(--line, #e2e8f0);
  background: #f8fafc;
  display: none;
}
.ai-modal-fallback.show { display: block; }
.ai-modal-fallback-text {
  font-size: 13px;
  color: #64748b;
  margin-bottom: 10px;
}
.ai-modal-fallback-buttons {
  display: flex;
  gap: 8px;
}
.ai-modal-fallback-btn {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--line, #e2e8f0);
  background: #fff;
  color: var(--brand, #0f172a);
  transition: all 0.15s;
}
.ai-modal-fallback-btn.primary {
  background: #25D366;
  color: #fff;
  border-color: #25D366;
}
.ai-modal-fallback-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent, #f97316);
}

.ai-modal-footer {
  padding: 10px 20px;
  border-top: 1px solid var(--line, #e2e8f0);
  background: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: #94a3b8;
}
.ai-modal-footer-keys { display: flex; gap: 12px; }
.ai-modal-footer-key { display: inline-flex; align-items: center; gap: 4px; }
.ai-modal-footer-key kbd {
  font-family: var(--font-mono, monospace);
  background: #fff;
  border: 1px solid var(--line, #e2e8f0);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 10px;
}

@keyframes ai-fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes ai-slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .ai-modal-backdrop { padding-top: 4vh; }
  .ai-modal { max-height: 92vh; border-radius: 12px; }
  .ai-modal-input { font-size: 15px; }
}