/* ===== CSS Variables ===== */
:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Layout ===== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

/* ===== Link Input Section ===== */
.link-input-section {
  display: flex;
  gap: 10px;
  align-items: center;
}

.link-input-section input {
  flex: 1;
  max-width: 500px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.link-input-section input:focus {
  border-color: var(--color-primary);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
}

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

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

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

.btn-danger:hover {
  background: #dc2626;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  background: var(--color-bg);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

/* ===== Brand Filter ===== */
.brand-filter-section {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.brand-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.brand-btn {
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.brand-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.brand-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

/* ===== Tag Filter ===== */
.tag-filter-section {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.tag-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-btn {
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.tag-btn:hover {
  border-color: var(--color-accent, #f59e0b);
  color: var(--color-accent, #f59e0b);
}

.tag-btn.active {
  background: var(--color-accent, #f59e0b);
  border-color: var(--color-accent, #f59e0b);
  color: white;
}

/* ===== Param Filter ===== */
.param-filter-section {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.param-filter-group {
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}

.param-filter-group label {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.param-filter-group select {
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: white;
  cursor: pointer;
  min-width: 120px;
}

.param-filter-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.param-filter-group select[multiple] {
  min-width: 150px;
  height: auto;
  padding: 4px 8px;
}

/* Excel风格系列下拉多选 */
.series-filter-group {
  position: relative;
}

.series-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: white;
  cursor: pointer;
  min-width: 120px;
}

.series-dropdown-trigger:hover {
  border-color: var(--color-primary);
}

.series-dropdown-arrow {
  font-size: 10px;
  color: var(--color-text-secondary);
  margin-left: auto;
}

.series-dropdown-panel {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 100;
  min-width: 200px;
  max-width: 300px;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  margin-top: 4px;
}

.series-dropdown-search {
  margin-bottom: 8px;
}

.series-dropdown-search input {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 12px;
  box-sizing: border-box;
}

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

.series-dropdown-checkboxes {
  max-height: 200px;
  overflow-y: auto;
}

.series-dropdown-footer {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
  text-align: right;
}

.series-dropdown-close {
  padding: 4px 12px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
}

.series-dropdown-close:hover {
  background: var(--color-primary-dark);
}

.series-checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
}

.series-checkbox-label:hover {
  background: var(--color-bg);
}

.series-checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  user-select: none;
}

.series-checkbox-item:hover {
  background: var(--color-bg);
}

.series-checkbox-box {
  width: 16px;
  height: 16px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s;
}

.series-checkbox-box::after {
  content: '✓';
  font-size: 12px;
  color: white;
  display: none;
}

.series-checkbox-box.checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.series-checkbox-box.checked::after {
  display: block;
}

.series-checkbox-text {
  font-size: 13px;
  color: var(--color-text);
}

.filter-actions {
  margin-left: auto;
}

.filter-actions .btn {
  font-size: 12px;
  padding: 6px 12px;
}

/* ===== Main Content ===== */
main {
  padding: 20px 0;
}

.chart-container {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 20px;
  min-height: 600px;
}

#scatter-chart {
  width: 100%;
  height: 580px;
}

/* ===== Loading State ===== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--color-text-secondary);
}

.loading::before {
  content: '';
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-right: 10px;
}

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

/* ===== Hover Card (ProductCard) ===== */
.product-hover-card {
  position: fixed;
  z-index: 1000;
  pointer-events: none;
  background: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 16px;
  width: 280px;
  opacity: 0;
  transition: opacity 0.15s ease;
  border: 1px solid var(--color-border);
}

.product-hover-card.visible {
  opacity: 1;
}

.product-hover-card img {
  width: 100%;
  height: 120px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  background: var(--color-bg);
}

.product-hover-card .product-name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
  color: var(--color-text);
}

.product-hover-card .product-price {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-danger);
  margin-bottom: 8px;
}

.product-hover-card .product-meta {
  font-size: 12px;
  color: var(--color-text-secondary);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.product-hover-card .product-meta span {
  display: flex;
  gap: 6px;
}

.product-hover-card .product-meta strong {
  color: var(--color-text);
  min-width: 50px;
}

/* ===== Modal / Confirm Dialog ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s;
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: transform 0.2s;
}

.modal-overlay.visible .modal-card {
  transform: translateY(0);
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  font-size: 20px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
}

.modal-close:hover {
  background: var(--color-bg);
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* ===== Product Preview in Modal ===== */
.product-preview {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preview-row {
  display: flex;
  gap: 10px;
  font-size: 14px;
}

.preview-row .label {
  color: var(--color-text-secondary);
  min-width: 80px;
}

.preview-row .value {
  color: var(--color-text);
  font-weight: 500;
}

.preview-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-danger);
}

.edit-field {
  flex: 1;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 13px;
  background: #fff;
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s;
}

.edit-field:focus {
  border-color: var(--color-primary);
}

.edit-field::placeholder {
  color: #adb5bd;
}

input[type="number"].edit-field {
  -moz-appearance: textfield;
}

input[type="number"].edit-field::-webkit-outer-spin-button,
input[type="number"].edit-field::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* ===== Product Detail Page ===== */
.product-detail {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.back-link:hover {
  color: var(--color-primary);
}

.product-detail-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.product-detail-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 0;
}

@media (max-width: 768px) {
  .product-detail-layout {
    grid-template-columns: 1fr;
  }
}

.product-image-section {
  background: var(--color-bg);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image-section img {
  max-width: 100%;
  max-height: 300px;
  object-fit: contain;
}

.product-info-section {
  padding: 24px;
}

.product-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.product-basic-info {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.product-basic-info .badge {
  background: var(--color-bg);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.product-price-detail {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-danger);
  margin-bottom: 24px;
}

.product-params {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.param-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.param-item .param-label {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.param-item .param-value {
  font-size: 14px;
  font-weight: 500;
}

/* ===== Performance Score Bar ===== */
.performance-section {
  margin-bottom: 24px;
}

.performance-section h4 {
  font-size: 14px;
  margin-bottom: 8px;
}

.performance-bar {
  height: 24px;
  background: var(--color-bg);
  border-radius: 12px;
  overflow: hidden;
  position: relative;
}

.performance-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-success), var(--color-primary));
  border-radius: 12px;
  transition: width 0.5s ease;
}

.performance-bar-text {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
}

/* ===== Action Buttons ===== */
.product-actions {
  display: flex;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-secondary);
}

.empty-state h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.empty-state p {
  font-size: 14px;
}

/* ===== Toast Notification ===== */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--color-text);
  color: white;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s;
}

.toast.visible {
  transform: translateY(0);
  opacity: 1;
}

.toast.success {
  background: var(--color-success);
}

.toast.error {
  background: var(--color-danger);
}

.toast.warning {
  background: var(--color-warning);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .param-filter-section {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .filter-actions {
    margin-left: 0;
    margin-top: 10px;
  }
  
  #scatter-chart {
    height: 400px;
  }
  
  .product-params {
    grid-template-columns: 1fr;
  }
}