/* 价比客 - Web 版样式 */
:root {
  --color-bg: #F5F5F7;
  --color-bg-white: #FFFFFF;
  --color-primary: #3B82F6;
  --color-primary-light: #EBF2FF;
  --color-success: #10B981;
  --color-danger: #EF4444;
  --color-text: #1F2937;
  --color-text-secondary: #6B7280;
  --color-border: #E5E7EB;
  --color-tag-bg: #F3F4F6;
  --radius-sm: 8px;
  --radius-base: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-base: 0 2px 8px rgba(0,0,0,0.08);
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-base: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-user-select: none;
  user-select: none;
}

.app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  background-color: var(--color-bg);
  padding: 0 var(--spacing-base);
}

/* 顶部导航 */
.app-header {
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  background: linear-gradient(135deg, #3B82F6 0%, #6366F1 100%);
  color: #fff;
  margin: calc(0 - var(--spacing-base)) calc(0 - var(--spacing-base)) var(--spacing-base);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.app-subtitle {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin-top: 4px;
}

/* 主内容区 */
.main-content {
  padding-bottom: var(--spacing-xl);
}

/* 操作按钮 */
.action-bar {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-base);
}

/* 卡片 */
.card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-base);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-base);
}

.hidden {
  display: none !important;
}

/* 按钮 */
.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  padding: 10px 16px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.btn-sm {
  padding: 8px 14px;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 14px 24px;
  font-size: var(--font-size-base);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background: #2563EB;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
}

.btn-outline:hover:not(:disabled) {
  background: var(--color-bg);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
  background: #DC2626;
}

.flex {
  display: flex;
}

.flex-1 {
  flex: 1;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mt-base {
  margin-top: var(--spacing-base);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.ml-sm {
  margin-left: var(--spacing-sm);
}

.mb-base {
  margin-bottom: var(--spacing-base);
}

.text-lg {
  font-size: var(--font-size-lg);
}

.text-sm {
  font-size: var(--font-size-sm);
}

.text-xs {
  font-size: var(--font-size-xs);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.font-bold {
  font-weight: 700;
}

/* 表单 */
.form-item {
  margin-bottom: var(--spacing-base);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  background: #fff;
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.error-text {
  color: var(--color-danger);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-xs);
}

/* 商品卡片 */
.product-cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.product-card {
  position: relative;
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-base);
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  transition: border-color 0.3s;
}

.product-card.best {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* 头部：缩略图 + 信息 */
.card-head {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-start;
}

.thumb {
  flex: 0 0 72px;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-base);
  object-fit: cover;
  background: var(--color-tag-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  overflow: hidden;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.product-name {
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.35;
  word-break: break-all;
}

.sub-line {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.product-spec {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.source-chip {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 8px;
  font-weight: 500;
  line-height: 1.5;
}

.chip-ai {
  background: rgba(16, 185, 129, 0.12);
  color: var(--color-success);
}

.chip-manual {
  background: rgba(107, 114, 128, 0.12);
  color: var(--color-text-secondary);
}

.price-line {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.product-price {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-danger);
}

.per-unit {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.unit-line {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.unit-line strong {
  color: var(--color-text);
  font-weight: 700;
}

/* 卡片底部操作 */
.card-foot {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
  margin-top: var(--spacing-sm);
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
}

.btn-delete,
.btn-edit {
  background: transparent;
  border: none;
  font-size: var(--font-size-sm);
  padding: 5px 12px;
  cursor: pointer;
  border-radius: var(--radius-base);
}

.btn-delete {
  color: var(--color-danger);
}

.btn-delete:hover {
  background: rgba(239, 68, 68, 0.1);
}

.btn-edit {
  color: var(--color-primary);
}

.btn-edit:hover {
  background: rgba(59, 130, 246, 0.1);
}

/* 表单实时预览 */
.form-preview {
  margin-top: var(--spacing-xs);
  padding: 10px 12px;
  background: var(--color-primary-light);
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.form-preview strong {
  color: var(--color-primary);
  font-size: var(--font-size-base);
}

/* 最优标签 */
.best-tag {
  position: absolute;
  top: -9px;
  right: 12px;
  background: var(--color-primary);
  color: #fff;
  font-size: var(--font-size-xs);
  padding: 3px 12px;
  border-radius: 14px;
  font-weight: 700;
  z-index: 2;
}

/* 单位价格对比 */
.unit-compare {
  margin-top: var(--spacing-base);
  padding-top: var(--spacing-base);
  border-top: 1px solid var(--color-border);
}

.compare-tip {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin: 4px 0 8px;
}

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.compare-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.compare-item:last-child {
  border-bottom: none;
}

.compare-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--spacing-sm);
}

.compare-name {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.compare-price {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text);
  flex-shrink: 0;
}

.compare-item.best .compare-price {
  color: var(--color-primary);
}

.compare-bar-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.compare-bar {
  height: 6px;
  border-radius: 3px;
  background: #C7D2FE;
  transition: width 0.3s;
}

.compare-item.best .compare-bar {
  background: var(--color-primary);
}

.compare-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.compare-item.best .compare-label {
  color: var(--color-primary);
  font-weight: 600;
}

/* 空状态 */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.empty-icon {
  font-size: 80px;
  opacity: 0.4;
}

.empty-text {
  margin-top: var(--spacing-base);
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

/* 加载遮罩 */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: var(--spacing-base);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast */
.toast {
  position: fixed;
  top: 76px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(17, 24, 39, 0.92);
  color: #fff;
  padding: 10px 18px;
  border-radius: 20px;
  font-size: var(--font-size-sm);
  z-index: 2000;
  max-width: 84vw;
  text-align: center;
  animation: toastIn 0.25s ease-out;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* 隐藏文件输入 */
.hidden {
  display: none;
}

/* 响应式 */
@media (max-width: 480px) {
  .app {
    padding: 0 12px;
  }
  .app-header {
    margin: 0 -12px;
  }
}