:root {
  /* === Brand Colors (Emerald Green) === */
  --color-primary: #059669;
  --color-primary-hover: #047857;
  --color-primary-light: #D1FAE5;
  --color-primary-dark: #065F46;
  --color-secondary: #0D9488;
  --color-secondary-light: #CCFBF1;

  /* === Neutral Palette === */
  --color-bg-body: #F0F2F5;
  --color-bg-white: #FFFFFF;
  --color-bg-sidebar: #1E2A3A;
  --color-bg-sidebar-hover: #2C3E50;
  --color-bg-sidebar-active: #059669;
  --color-bg-card: #FFFFFF;
  --color-bg-input: #F5F7FA;
  --color-bg-table-header: #FAFBFC;
  --color-bg-table-stripe: #F8FAFC;
  --color-bg-tooltip: #1E2A3A;

  --color-text-primary: #1A1A2E;
  --color-text-secondary: #6B7280;
  --color-text-tertiary: #9CA3AF;
  --color-text-sidebar: #C0CCDA;
  --color-text-sidebar-active: #FFFFFF;
  --color-text-on-primary: #FFFFFF;
  --color-text-on-dark: #FFFFFF;
  --color-text-link: #059669;

  --color-border: #E5E7EB;
  --color-border-light: #F0F0F0;
  --color-border-focus: #059669;

  /* === State Colors === */
  --state-success: #10B981;
  --state-success-bg: #ECFDF5;
  --state-warning: #F59E0B;
  --state-warning-bg: #FFFBEB;
  --state-error: #EF4444;
  --state-error-bg: #FEF2F2;
  --state-info: #059669;
  --state-info-bg: #D1FAE5;

  /* === Platform Colors (Pinduoduo / Taobao / Douyin) === */
  --color-pdd: #E02E24;
  --color-pdd-bg: #FEF2F2;
  --color-taobao: #FF5000;
  --color-taobao-bg: #FFF7ED;
  --color-douyin: #010101;
  --color-douyin-bg: #F3F4F6;

  /* === Radius Scale === */
  --radius-sm: 2px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* === Shadow === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-float: 0 12px 36px rgba(0, 0, 0, 0.12);

  /* === Typography === */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 15px;
  --text-lg: 16px;
  --text-xl: 18px;
  --text-2xl: 20px;
  --text-3xl: 24px;
  --text-4xl: 28px;
  --text-5xl: 32px;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  --tracking-tight: -0.01em;
  --tracking-normal: 0;

  /* === Spacing === */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-base: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --space-3xl: 48px;
  --space-4xl: 64px;

  /* === Layout === */
  --sidebar-width: 220px;
  --sidebar-collapsed-width: 64px;
  --header-height: 56px;
  --content-max-width: 1440px;

  /* === Login Page Specific === */
  --login-bg: linear-gradient(135deg, #047857 0%, #059669 50%, #0D9488 100%);
  --login-card-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);

  /* === Sidebar Flyout Menu === */
  --flyout-width: 680px;
  --flyout-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

/* ===== SIDEBAR FLYOUT MENU STYLES ===== */
.nav-group { position: relative; }
.nav-group.has-flyout .nav-item::after {
  content: '';
  position: absolute;
  right: 0; top: 0;
  width: 6px; height: 100%;
}
.nav-flyout {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  width: var(--flyout-width);
  background: #fff;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--flyout-shadow);
  z-index: 1000;
  padding: 16px 0;
  min-height: 100%;
}
.nav-group.has-flyout:hover > .nav-flyout {
  display: flex;
}
.nav-flyout::before {
  content: '';
  position: absolute;
  left: -6px; top: 0;
  width: 6px; height: 100%;
}
.nav-flyout-col {
  flex: 1;
  padding: 0 16px;
  border-right: 1px solid var(--color-border-light);
  min-width: 0;
}
.nav-flyout-col:last-child { border-right: none; }
.nav-flyout-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-primary);
  padding: 4px 8px 10px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-flyout-title .flyout-title-icon {
  width: 18px; height: 18px;
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
}
.nav-flyout-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  font-size: 12px;
  color: var(--color-text-secondary);
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
}
.nav-flyout-item:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.nav-flyout-item .flyout-icon {
  width: 16px; height: 16px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-tertiary);
}
.nav-flyout-item:hover .flyout-icon { color: var(--color-primary); }
.nav-flyout-badge {
  position: absolute;
  right: 8px;
  background: var(--state-error);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  padding: 0 5px;
  height: 16px;
  line-height: 16px;
  border-radius: var(--radius-full);
  min-width: 16px;
  text-align: center;
}
.nav-flyout-section { margin-bottom: 12px; }
.nav-flyout-section:last-child { margin-bottom: 0; }
.nav-flyout-section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  padding: 6px 8px 4px;
  text-transform: none;
  letter-spacing: 0;
}