:root {
  /* Light Mode Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-dark: #f1f5f9; /* Actually background-light now */
  --bg-card: rgba(255, 255, 255, 0.85);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --danger-color: #ef4444;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --glass-border: rgba(0, 0, 0, 0.05);
  --sidebar-bg: rgba(255, 255, 255, 0.95);
  --header-bg: rgba(255, 255, 255, 0.85);
  --bg-gradient-1: rgba(37, 99, 235, 0.08);
  --bg-gradient-2: rgba(16, 185, 129, 0.05);
  --nav-hover-bg: rgba(37, 99, 235, 0.08);
  --table-header-bg: rgba(241, 245, 249, 0.8);
  --input-bg: rgba(255, 255, 255, 1);
  --input-border: #cbd5e1;
  --sidebar-width: 260px;
  --header-height: 64px;
}

[data-theme="dark"] {
  /* Dark Mode Colors */
  --bg-primary: #1e293b;
  --bg-secondary: #0f172a;
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --glass-border: rgba(255, 255, 255, 0.1);
  --sidebar-bg: rgba(15, 23, 42, 0.8);
  --header-bg: rgba(15, 23, 42, 0.6);
  --bg-gradient-1: rgba(59, 130, 246, 0.15);
  --bg-gradient-2: rgba(16, 185, 129, 0.1);
  --nav-hover-bg: rgba(59, 130, 246, 0.15);
  --table-header-bg: rgba(30, 41, 59, 0.4);
  --input-bg: rgba(15, 23, 42, 0.5);
  --input-border: var(--glass-border);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  overflow: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Glassmorphism Utilities */
.glass {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  transition: background 0.3s ease, border-color 0.3s ease;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  flex-shrink: 0;
  height: 100vh;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--glass-border);
  background: var(--sidebar-bg);
  backdrop-filter: blur(10px);
  transition: background 0.3s ease, border-color 0.3s ease;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 32px;
  padding: 0 8px;
  white-space: nowrap;
}

.brand .logo {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-color), #8b5cf6);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #fff;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 6px;
  list-style: none;
}

.nav-item {
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  white-space: nowrap;
}

.nav-item:hover, .nav-item.active {
  background: var(--nav-hover-bg);
  color: var(--text-primary);
  border-left: 3px solid var(--accent-color);
}

/* Main Layout */
.main-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-x: hidden;
}

.top-header {
  height: var(--header-height);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--glass-border);
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border-radius: 50%;
  transition: all 0.2s;
}
.theme-toggle:hover {
  background: var(--nav-hover-bg);
  color: var(--text-primary);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-color);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

/* Content Area */
.content-area {
  flex: 1;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  padding: 32px;
  overflow-y: auto;
  box-sizing: border-box;
}

@media (max-width: 1440px) {
  .content-area {
    padding: 24px 20px;
  }
}

.page-section {
  display: none;
  animation: fadeIn 0.4s ease-in-out;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.page-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.stat-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-title {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-trend {
  font-size: 0.75rem;
  font-weight: 500;
}
.trend-up { color: var(--success-color); }
.trend-down { color: var(--danger-color); }

/* Tables */
.data-table-wrapper {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border-radius: 12px;
  margin-top: 24px;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th, .data-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--glass-border);
}

.data-table th {
  color: var(--text-secondary);
  font-weight: 600;
  background: var(--table-header-bg);
  font-size: 0.875rem;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover {
  background: rgba(128, 128, 128, 0.05);
}

/* Status Badges */
.badge {
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  display: inline-block;
}

.badge.warning { background: rgba(245, 158, 11, 0.15); color: var(--warning-color); }
.badge.success { background: rgba(16, 185, 129, 0.15); color: var(--success-color); }
.badge.primary { background: rgba(59, 130, 246, 0.15); color: var(--accent-color); }
.badge.danger { background: rgba(239, 68, 68, 0.15); color: var(--danger-color); }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

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

.btn-outline {
  background: transparent;
  border-color: var(--glass-border);
  color: var(--text-primary);
}
.btn-outline:hover { background: var(--nav-hover-bg); }

.btn-sm {
  padding: 6px 12px;
  font-size: 0.75rem;
}

.btn-danger { background: var(--danger-color); color: white; }
.btn-danger:hover { background: #dc2626; }
.btn-success { background: var(--success-color); color: white; }
.btn-success:hover { background: #059669; }

/* Forms */
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

/* Tabs */
.tabs-container {
  display: flex;
  gap: 16px;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 24px;
}
.tab {
  padding: 12px 16px;
  cursor: pointer;
  color: var(--text-secondary);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.tab:hover { color: var(--text-primary); }
.tab.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

/* Modal Dialog System (全局弹窗标准体系，严格约束视口，杜绝横向溢出) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  box-sizing: border-box;
  z-index: 10000;
  overflow: hidden;
}

.modal-content {
  background: var(--bg-primary);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  max-width: 95vw;
  max-height: 90vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  overflow: hidden;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px 0;
  box-sizing: border-box;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--glass-border);
  flex-shrink: 0;
}

/* ========================================================
   PC 全局浮动同步横向滚动条 (Floating Sync Horizontal Scrollbar)
   ======================================================== */
.global-floating-scrollbar {
  position: fixed;
  bottom: 0;
  height: 12px;
  overflow-x: auto;
  overflow-y: hidden;
  z-index: 9990; /* 必须低于全屏遮罩/Modal(10000)，但在内容区之上 */
  background: rgba(241, 245, 249, 0.95);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-top: 1px solid rgba(203, 213, 225, 0.8);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
  border-radius: 6px 6px 0 0;
  transition: opacity 0.15s ease, transform 0.15s ease;
  pointer-events: auto;
  box-sizing: border-box;
}

.global-floating-scrollbar.in-modal {
  z-index: 10005; /* 当激活区域处于 Modal 内部时，提升层级至 Modal 内容层上方 */
}

.global-floating-scrollbar::-webkit-scrollbar {
  height: 10px;
}

.global-floating-scrollbar::-webkit-scrollbar-track {
  background: rgba(226, 232, 240, 0.6);
  border-radius: 5px;
}

.global-floating-scrollbar::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.6);
  border-radius: 5px;
  transition: background 0.2s ease;
}

.global-floating-scrollbar::-webkit-scrollbar-thumb:hover {
  background: rgba(51, 65, 85, 0.9);
}

[data-theme="dark"] .global-floating-scrollbar {
  background: rgba(15, 23, 42, 0.95);
  border-top: 1px solid rgba(51, 65, 85, 0.8);
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .global-floating-scrollbar::-webkit-scrollbar-track {
  background: rgba(30, 41, 59, 0.8);
}

[data-theme="dark"] .global-floating-scrollbar::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.5);
}

[data-theme="dark"] .global-floating-scrollbar::-webkit-scrollbar-thumb:hover {
  background: rgba(203, 213, 225, 0.85);
}

.global-floating-scrollbar-spacer {
  height: 1px;
  pointer-events: none;
}