:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--gray-100);
  color: var(--gray-900);
  line-height: 1.6;
}

/* ============ 公开页面 ============ */
.public-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.public-card {
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  max-width: 480px;
  width: 100%;
  padding: 40px 30px;
  text-align: center;
}

.logo-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: white;
  margin-bottom: 16px;
}

.public-card h1 { font-size: 22px; margin-bottom: 8px; }
.public-card .subtitle { color: var(--gray-500); font-size: 14px; margin-bottom: 24px; }

.input-group { margin-bottom: 16px; text-align: left; }
.input-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.input-group input, .input-group select, .input-group textarea {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  transition: border-color 0.2s;
}
.input-group input:focus, .input-group select:focus, .input-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: white; }
.btn-outline { background: transparent; border: 1px solid var(--gray-300); color: var(--gray-700); }
.btn-outline:hover { background: var(--gray-100); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-block { display: block; width: 100%; padding: 12px; font-size: 16px; }

/* ============ 溯源结果 ============ */
.trace-result { text-align: left; }
.trace-result .header-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 20px;
  font-size: 13px; font-weight: 600;
  margin-bottom: 20px;
}
.badge-success { background: #dcfce7; color: #166534; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }

.info-row {
  display: flex; justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-100);
  font-size: 14px;
}
.info-row:last-child { border-bottom: none; }
.info-row .label { color: var(--gray-500); flex-shrink: 0; }
.info-row .value { font-weight: 600; text-align: right; }

.verify-seal {
  margin-top: 24px; padding: 16px;
  background: #eff6ff; border-radius: var(--radius);
  text-align: center; color: var(--primary-dark);
  font-size: 14px;
}

/* ============ 管理后台 ============ */
.admin-login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
}

.admin-layout { display: flex; min-height: 100vh; }

/* 侧边栏 */
.sidebar {
  width: 220px;
  background: var(--gray-900);
  color: white;
  padding: 0;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}
.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  font-size: 18px;
  font-weight: 700;
}
.sidebar-header span { color: #60a5fa; }

.sidebar-menu {
  flex: 1;
  padding: 12px 0;
}
.menu-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 20px;
  color: #d1d5db;
  cursor: pointer;
  transition: background 0.2s;
  font-size: 14px;
  border-left: 3px solid transparent;
}
.menu-item:hover { background: rgba(255,255,255,0.05); color: white; }
.menu-item.active { background: rgba(37,99,235,0.2); color: white; border-left-color: var(--primary); }
.menu-item svg { width: 20px; height: 20px; flex-shrink: 0; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

/* 主内容区 */
.main-content {
  flex: 1;
  background: var(--gray-100);
  overflow-y: auto;
  max-height: 100vh;
}

.page-header {
  background: white;
  padding: 16px 24px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.page-header h2 { font-size: 18px; }

.content-body { padding: 24px; }

/* 统计卡片 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.stat-card .stat-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  margin-bottom: 12px;
}
.stat-card .stat-value { font-size: 28px; font-weight: 700; }
.stat-card .stat-label { font-size: 13px; color: var(--gray-500); }

/* 表格 */
.table-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.table-toolbar {
  padding: 16px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--gray-100);
}
.search-input {
  padding: 8px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  min-width: 200px;
}
table { width: 100%; border-collapse: collapse; }
table th {
  background: var(--gray-50);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}
table td {
  padding: 12px 16px;
  border-top: 1px solid var(--gray-100);
  font-size: 14px;
  white-space: nowrap;
}
table tbody tr:hover { background: var(--gray-50); }

.status-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}
.tag-gray { background: var(--gray-200); color: var(--gray-700); }
.tag-green { background: #dcfce7; color: #166534; }
.tag-red { background: #fee2e2; color: #991b1b; }
.tag-blue { background: #dbeafe; color: #1e40af; }

/* 分页 */
.pagination {
  display: flex;
  gap: 4px;
  justify-content: center;
  padding: 16px;
  align-items: center;
}
.pagination button {
  padding: 6px 12px;
  border: 1px solid var(--gray-300);
  background: white;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}
.pagination button.active { background: var(--primary); color: white; border-color: var(--primary); }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination .page-info { font-size: 13px; color: var(--gray-500); margin: 0 8px; }

/* 模态框 */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-overlay.show { display: flex; }
.modal {
  background: white;
  border-radius: 12px;
  width: 90%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-header h3 { font-size: 16px; }
.modal-close { cursor: pointer; font-size: 20px; color: var(--gray-500); background: none; border: none; }
.modal-body { padding: 20px; }
.modal-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.form-row { margin-bottom: 16px; }
.form-row label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
}
.form-row textarea { resize: vertical; min-height: 70px; }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Toast */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: var(--radius);
  color: white;
  font-size: 14px;
  z-index: 9999;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow-lg);
}
@keyframes slideIn { from { transform: translateX(100%); } to { transform: translateX(0); } }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes highlightPulse {
  0% { background-color: #fef3c7; box-shadow: 0 0 0 3px #f59e0b inset; }
  50% { background-color: #fde68a; box-shadow: 0 0 0 4px #f59e0b inset; }
  100% { background-color: #fef3c7; box-shadow: 0 0 0 3px #f59e0b inset; }
}
.batch-highlight {
  animation: highlightPulse 2s ease-in-out 2;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--gray-500);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: 12px; }

/* 日期选择器 */
input[type="date"] { cursor: pointer; }

/* 扫码趋势图 */
.chart-container {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 24px;
}
.chart-container h3 { font-size: 16px; margin-bottom: 16px; }
.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 160px;
  padding-bottom: 24px;
  position: relative;
}
.chart-bar-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.chart-bar {
  width: 100%;
  background: var(--primary);
  border-radius: 4px 4px 0 0;
  min-height: 2px;
  transition: height 0.5s ease;
  position: relative;
}
.chart-bar:hover { background: var(--primary-dark); }
.chart-bar-value {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  color: var(--gray-700);
}
.chart-bar-label { font-size: 11px; color: var(--gray-500); }