:root {
  /* 品牌色系统 - 确立企业蓝为基线 */
  --brand-primary: #1a73e8;
  --brand-primary-hover: #1557b0;
  --brand-primary-light: #e8f0fe;
  --brand-secondary: #0ea5e9;
  --brand-accent: #f97316;
  --brand-accent-hover: #ea580c;

  /* 语义/状态色 */
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.12);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.12);
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.12);
  --color-info: #0284c7;

  /* 中性灰度阶梯 */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* 浅色主题底色与文字 */
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-muted: #f1f5f9;
  --text-main: #0f172a;
  --text-sub: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;

  /* 字体体系与层级 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Source Han Sans CN", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */

  /* 间距网格 (4px baseline) */
  --space-1: 0.25rem;     /* 4px */
  --space-2: 0.5rem;      /* 8px */
  --space-3: 0.75rem;     /* 12px */
  --space-4: 1rem;        /* 16px */
  --space-5: 1.25rem;     /* 20px */
  --space-6: 1.5rem;      /* 24px */
  --space-8: 2rem;        /* 32px */
  --space-10: 2.5rem;     /* 40px */

  /* 形状与阴影 (提升大气感与专业质感) */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 12px 24px -4px rgba(26, 115, 232, 0.15);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* 统一暗色主题模式 (admin 管理后台与深色模式) */
[data-theme="dark"], body.theme-dark {
  --bg-page: #0b0f19;
  --bg-card: #111827;
  --bg-card-hover: #1f2937;
  --bg-muted: #1e293b;
  --text-main: #f9fafb;
  --text-sub: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.04);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.6);
}

/* 常用全局通用类 */
.c-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: all var(--transition-fast);
  line-height: 1.25;
}
.c-btn-primary {
  background: var(--brand-primary);
  color: #ffffff !important;
}
.c-btn-primary:hover {
  background: var(--brand-primary-hover);
  box-shadow: var(--shadow-hover);
}
.c-btn-accent {
  background: var(--brand-accent);
  color: #ffffff !important;
}
.c-btn-accent:hover {
  background: var(--brand-accent-hover);
}
.c-btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-main) !important;
}
.c-btn-outline:hover {
  background: var(--bg-muted);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-sans);
}

body {
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font: inherit;
}

.c-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
  background: var(--bg-page);
}

.c-sidebar {
  background: linear-gradient(180deg, #0b1220 0%, #111827 100%);
  color: #e5eefb;
  padding: 1.5rem 1rem 1.25rem;
  border-right: 1px solid rgba(255,255,255,0.06);
}

.c-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.c-brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.75rem;
  display: grid;
  place-items: center;
  font-weight: 700;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #fff;
}

.c-brand-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.c-nav-groups {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.c-nav-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.c-nav-group-title {
  padding: 0.3rem 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(203,213,225,0.72);
}

.c-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.85rem;
  border-radius: 0.75rem;
  color: rgba(226,232,240,0.9);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.c-nav-link:hover,
.c-nav-link.is-active {
  background: rgba(59,130,246,0.16);
  color: #fff;
  transform: translateX(2px);
}

.c-nav-icon {
  width: 1.5rem;
  text-align: center;
  opacity: 0.9;
}

.c-main {
  padding: 1.5rem 1.75rem 2rem;
}

.c-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.c-page-title {
  margin: 0;
  font-size: clamp(1.6rem, 2vw, 2.1rem);
  line-height: 1.2;
}

.c-topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.c-search {
  min-width: 240px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.7rem 1rem;
  color: var(--text-main);
}

.c-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.c-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 1.1rem 1.15rem;
}

.c-stat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-sub);
  font-size: var(--text-sm);
}

.c-stat-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.7rem;
  display: grid;
  place-items: center;
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  font-weight: 700;
}

.c-stat-value {
  margin-top: 0.8rem;
  font-size: clamp(1.7rem, 2vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.c-stat-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

.c-stat-delta.is-up {
  color: var(--color-success);
}

.c-stat-delta.is-down {
  color: var(--color-danger);
}

.c-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: 1rem;
}

.c-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 1.2rem;
}

.c-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.c-panel-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.c-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.c-badge-info {
  background: rgba(59,130,246,0.12);
  color: #1d4ed8;
}

.c-badge-success {
  background: rgba(16,185,129,0.12);
  color: #047857;
}

.c-chart {
  display: flex;
  align-items: end;
  gap: 0.8rem;
  height: 180px;
  padding-top: 0.75rem;
}

.c-chart-bar {
  flex: 1;
  border-radius: 0.8rem 0.8rem 0 0;
  min-height: 30px;
  background: linear-gradient(180deg, rgba(26,115,232,0.9), rgba(14,165,233,0.6));
  position: relative;
}

.c-chart-bar:nth-child(2n) {
  background: linear-gradient(180deg, rgba(249,115,22,0.8), rgba(249,115,22,0.45));
}

.c-chart-labels {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: 0.6rem;
}

.c-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.c-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  padding: 0.8rem 0.9rem;
  border-radius: 0.8rem;
  background: var(--bg-muted);
}

.c-list-meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.c-list-meta strong {
  font-size: 0.94rem;
}

.c-list-meta span {
  color: var(--text-muted);
  font-size: 0.76rem;
}

.c-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
}

.c-table th,
.c-table td {
  padding: 0.8rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
}

.c-table th {
  color: var(--text-muted);
  font-weight: 600;
  background: rgba(148,163,184,0.05);
}

.c-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.c-checklist li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.75rem 0.8rem;
  background: var(--bg-muted);
  border-radius: 0.75rem;
  color: var(--text-main);
}

.c-checklist li::before {
  content: "✓";
  width: 1.5rem;
  height: 1.5rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: rgba(16,185,129,0.14);
  color: var(--color-success);
  font-weight: 700;
}

/* ============================================================
   阶段A补全1：按钮变体（补齐 secondary / danger / ghost + 尺寸）
   ============================================================ */
.c-btn-secondary {
  background: var(--bg-muted);
  border-color: var(--border-color);
  color: var(--text-main) !important;
}
.c-btn-secondary:hover {
  background: var(--border-color);
}
.c-btn-danger {
  background: var(--color-danger);
  color: #ffffff !important;
}
.c-btn-danger:hover {
  background: #dc2626;
  box-shadow: 0 12px 24px -4px rgba(239, 68, 68, 0.25);
}
.c-btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-sub) !important;
}
.c-btn-ghost:hover {
  background: var(--bg-muted);
  color: var(--text-main) !important;
}
.c-btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
}
.c-btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: var(--text-base);
}
.c-btn:disabled,
.c-btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ============================================================
   阶段A补全2：徽章变体（补齐 warning / danger / neutral）
   ============================================================ */
.c-badge-warning {
  background: var(--color-warning-bg);
  color: #b45309;
}
.c-badge-danger {
  background: var(--color-danger-bg);
  color: #b91c1c;
}
.c-badge-neutral {
  background: rgba(148, 163, 184, 0.16);
  color: var(--text-sub);
}

/* ============================================================
   阶段A补全3：表单体系（c-form / c-field / c-input / c-check）
   ============================================================ */
.c-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.c-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.c-field > label,
.c-field-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-sub);
}
.c-field-required::after {
  content: " *";
  color: var(--color-danger);
}
.c-input,
.c-select,
.c-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: var(--text-sm);
  color: var(--text-main);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.c-input:focus,
.c-select:focus,
.c-textarea:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.14);
}
.c-input::placeholder,
.c-textarea::placeholder {
  color: var(--text-muted);
}
.c-textarea {
  min-height: 96px;
  resize: vertical;
}
.c-field-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.c-field-error {
  font-size: 0.78rem;
  color: var(--color-danger);
}
.c-check {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  font-size: var(--text-sm);
  color: var(--text-sub);
  cursor: pointer;
}
.c-check input[type="checkbox"] {
  margin-top: 0.2rem;
  accent-color: var(--brand-primary);
}
.c-form-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* ============================================================
   阶段A补全4：分页样式（对齐 pagination.py 输出类名，勿改类名）
   ============================================================ */
.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1.25rem;
}
.pagination .pg-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.1rem;
  height: 2.1rem;
  padding: 0 0.6rem;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-sub);
  transition: all var(--transition-fast);
}
.pagination .pg-item:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}
.pagination .pg-current {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #ffffff;
  font-weight: 700;
}
.pagination .pg-disabled {
  opacity: 0.45;
  pointer-events: none;
}
.pagination .pg-gap {
  color: var(--text-muted);
  padding: 0 0.25rem;
}
.pagination .pg-info {
  margin-left: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  border: none;
  background: transparent;
}

/* ============================================================
   阶段A补全5：卡片基类 + 空状态组件
   ============================================================ */
.c-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 1.2rem;
}
.c-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
  background: var(--bg-muted);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-xl);
  color: var(--text-sub);
}
.c-empty-icon {
  font-size: 2rem;
  line-height: 1;
}
.c-empty-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-main);
}
.c-empty-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  max-width: 32rem;
}

/* ============================================================
   阶段A补全6：暗色模式适配（admin 后台用）
   ============================================================ */
[data-theme="dark"] .c-btn-secondary,
body.theme-dark .c-btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--text-main) !important;
}
[data-theme="dark"] .c-btn-secondary:hover,
body.theme-dark .c-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}
[data-theme="dark"] .c-btn-ghost,
body.theme-dark .c-btn-ghost {
  color: var(--text-sub) !important;
}
[data-theme="dark"] .c-btn-ghost:hover,
body.theme-dark .c-btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main) !important;
}
[data-theme="dark"] .c-badge-info,
body.theme-dark .c-badge-info {
  background: rgba(59, 130, 246, 0.22);
  color: #93c5fd;
}
[data-theme="dark"] .c-badge-success,
body.theme-dark .c-badge-success {
  background: rgba(16, 185, 129, 0.22);
  color: #6ee7b7;
}
[data-theme="dark"] .c-badge-warning,
body.theme-dark .c-badge-warning {
  background: rgba(245, 158, 11, 0.22);
  color: #fcd34d;
}
[data-theme="dark"] .c-badge-danger,
body.theme-dark .c-badge-danger {
  background: rgba(239, 68, 68, 0.22);
  color: #fca5a5;
}
[data-theme="dark"] .c-badge-neutral,
body.theme-dark .c-badge-neutral {
  background: rgba(148, 163, 184, 0.2);
  color: #cbd5e1;
}
[data-theme="dark"] .c-input,
[data-theme="dark"] .c-select,
[data-theme="dark"] .c-textarea,
body.theme-dark .c-input,
body.theme-dark .c-select,
body.theme-dark .c-textarea {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}
[data-theme="dark"] .pagination .pg-item,
body.theme-dark .pagination .pg-item {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
}
[data-theme="dark"] .c-empty-state,
body.theme-dark .c-empty-state {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.12);
}

@media (max-width: 980px) {
  .c-layout {
    grid-template-columns: 1fr;
  }

  .c-sidebar {
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }

  .c-stat-grid,
  .c-content-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .c-main {
    padding: 1rem;
  }

  .c-stat-grid,
  .c-content-grid {
    grid-template-columns: 1fr;
  }

  .c-topbar {
    align-items: flex-start;
  }
}

/* ============================================================
   阶段A补全7：品牌副标题等补充类
   ============================================================ */
.c-brand-copy {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.c-brand-copy span {
  font-size: 0.74rem;
  color: var(--text-muted);
}