/* ============================================
   组件样式库
   ============================================ */

/* === 导航栏 === */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--navbar-height);
  padding: 0 var(--spacing-md);
  background: var(--surface);
  border-bottom: 1px solid var(--border-default);
}
.navbar-title {
  font: var(--font-h4);
  color: var(--text-primary);
}
.navbar-back {
  position: absolute;
  left: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--primary-500);
  font-size: 14px;
  cursor: pointer;
}
.navbar-back::before {
  content: '‹';
  font-size: 24px;
  line-height: 1;
}
.navbar-right {
  position: absolute;
  right: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* === TabBar === */
.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  height: var(--tabbar-height);
  padding-bottom: var(--safe-area-bottom);
  background: var(--surface);
  border-top: 1px solid var(--border-default);
}
.tabbar-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--text-hint);
  font-size: 10px;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.tabbar-item.active {
  color: var(--primary-500);
}
.tabbar-icon {
  width: 24px;
  height: 24px;
  font-size: 20px;
  line-height: 24px;
  text-align: center;
}

/* === 搜索栏 === */
.search-bar {
  display: flex;
  align-items: center;
  height: 40px;
  padding: 0 var(--spacing-md);
  background: var(--background);
  border-radius: var(--radius-round);
  gap: var(--spacing-sm);
}
.search-bar input {
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
}
.search-bar input::placeholder {
  color: var(--text-hint);
}
.search-bar .search-icon {
  font-size: 16px;
  color: var(--text-hint);
}

/* === 卡片 === */
.card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.card-padded {
  padding: var(--spacing-md);
}

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 var(--spacing-lg);
  border-radius: var(--radius-round);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.btn:active {
  transform: scale(0.97);
}
.btn-primary {
  background: var(--primary-500);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-400);
}
.btn-secondary {
  background: var(--surface);
  color: var(--primary-500);
  border: 1px solid var(--primary-500);
}
.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-block {
  width: 100%;
}
.btn-lg {
  height: 48px;
  font-size: 16px;
}
.btn-sm {
  height: 32px;
  padding: 0 var(--spacing-md);
  font-size: 12px;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* === 标签 === */
.tag {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 8px;
  border-radius: var(--radius-round);
  font-size: 10px;
  font-weight: 500;
}
.tag-blue { background: var(--primary-100); color: var(--primary-500); }
.tag-green { background: #E8F5E9; color: var(--success); }
.tag-orange { background: #FFF3E0; color: var(--warning); }
.tag-red { background: #FFEBEE; color: var(--danger); }
.tag-gray { background: var(--background); color: var(--text-hint); }

/* === Toast === */
.toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 14px;
  pointer-events: none;
  animation: toastIn 0.3s ease;
}
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.9); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* === 模态框 === */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--mask);
  display: flex;
  align-items: flex-end;
  animation: fadeIn 0.2s ease;
}
.modal-sheet {
  width: 100%;
  max-height: 70vh;
  background: var(--surface);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: var(--spacing-lg);
  overflow-y: auto;
  animation: slideUp 0.25s ease;
}
.modal-dialog {
  width: 80%;
  max-width: 320px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  text-align: center;
  margin: auto;
  animation: scaleIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes scaleIn { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* === 骨架屏 === */
.skeleton {
  background: linear-gradient(90deg, var(--border-light) 25%, var(--border-default) 50%, var(--border-light) 75%);
  background-size: 200% 100%;
  animation: skeletonShimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}
@keyframes skeletonShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* === 输入框 === */
.form-input {
  width: 100%;
  height: 44px;
  padding: 0 var(--spacing-md);
  background: var(--background);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}
.form-input:focus {
  border-color: var(--primary-500);
  background: var(--surface);
}
.form-input.error {
  border-color: var(--danger);
}
.form-textarea {
  width: 100%;
  min-height: 120px;
  padding: var(--spacing-md);
  background: var(--background);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-primary);
  resize: vertical;
  line-height: 1.6;
}
.form-textarea:focus {
  border-color: var(--primary-500);
}
.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}
.form-error {
  margin-top: 4px;
  font-size: 12px;
  color: var(--danger);
}

/* === 加载动画 === */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-default);
  border-top-color: var(--primary-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* === 空状态 === */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl) var(--spacing-md);
  color: var(--text-hint);
}
.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}
.empty-state-text {
  font-size: 14px;
  margin-bottom: var(--spacing-md);
}

/* === 横向滚动容器 === */
.scroll-x {
  display: flex;
  gap: var(--spacing-sm);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--spacing-sm);
}
.scroll-x::-webkit-scrollbar { display: none; }
.scroll-x > * {
  scroll-snap-align: start;
  flex-shrink: 0;
}