:root {
  /* Brand primary — soft rose */
  --yueji-primary-50: #fff5f7;
  --yueji-primary-100: #ffe4ea;
  --yueji-primary-200: #ffccd7;
  --yueji-primary-300: #ffa3b8;
  --yueji-primary-400: #ff7a9a;
  --yueji-primary-500: #fa466f;
  --yueji-primary-600: #e02457;
  --yueji-primary-700: #bc113f;
  --yueji-primary-800: #9a1139;
  --yueji-primary-900: #821437;

  /* Neutral — warm gray */
  --yueji-neutral-50: #fafafa;
  --yueji-neutral-100: #f5f5f5;
  --yueji-neutral-200: #e5e5e5;
  --yueji-neutral-300: #d4d4d4;
  --yueji-neutral-400: #a3a3a3;
  --yueji-neutral-500: #737373;
  --yueji-neutral-600: #525252;
  --yueji-neutral-700: #404040;
  --yueji-neutral-800: #262626;
  --yueji-neutral-900: #171717;

  /* Semantic state colors */
  --yueji-state-success: #2dd4a7;
  --yueji-state-success-bg: #e6f9f2;
  --yueji-state-warning: #f59e0b;
  --yueji-state-warning-bg: #fff7e6;
  --yueji-state-error: #ef4444;
  --yueji-state-error-bg: #feecec;
  --yueji-state-info: #38bdf8;
  --yueji-state-info-bg: #e6f6fe;

  /* Surface & background */
  --yueji-background: #ffffff;
  --yueji-surface: #ffffff;
  --yueji-surface-elevated: #ffffff;
  --yueji-surface-muted: #fafafa;
  --yueji-overlay: rgba(23, 23, 23, 0.48);

  /* Text */
  --yueji-text-primary: #171717;
  --yueji-text-secondary: #737373;
  --yueji-text-tertiary: #a3a3a3;
  --yueji-text-inverse: #ffffff;
  --yueji-text-link: #fa466f;

  /* Border & divider */
  --yueji-border: #e5e5e5;
  --yueji-border-strong: #d4d4d4;
  --yueji-divider: #f0f0f0;

  /* Semantic aliases for Tailwind theme mapping */
  --yueji-foreground: var(--yueji-text-primary);
  --yueji-card: var(--yueji-surface);
  --yueji-primary: var(--yueji-primary-500);
  --yueji-muted: var(--yueji-surface-muted);

  /* Shadow */
  --yueji-shadow-sm: 0 1px 2px rgba(23, 23, 23, 0.04);
  --yueji-shadow-md: 0 4px 12px rgba(23, 23, 23, 0.05);
  --yueji-shadow-lg: 0 12px 28px rgba(23, 23, 23, 0.08);

  /* Radius */
  --yueji-radius-sm: 4px;
  --yueji-radius-md: 8px;
  --yueji-radius-lg: 12px;
  --yueji-radius-full: 9999px;

  /* Spacing base */
  --yueji-space-1: 4px;
  --yueji-space-2: 8px;
  --yueji-space-3: 12px;
  --yueji-space-4: 16px;
  --yueji-space-5: 20px;
  --yueji-space-6: 24px;
  --yueji-space-8: 32px;

  /* Typography */
  --yueji-font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --yueji-font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;

  --yueji-text-xs: 12px;
  --yueji-text-sm: 13px;
  --yueji-text-base: 15px;
  --yueji-text-lg: 17px;
  --yueji-text-xl: 20px;
  --yueji-text-2xl: 24px;
  --yueji-text-3xl: 30px;

  --yueji-leading-tight: 1.25;
  --yueji-leading-snug: 1.4;
  --yueji-leading-normal: 1.6;
  --yueji-leading-relaxed: 1.75;

  --yueji-weight-normal: 400;
  --yueji-weight-medium: 500;
  --yueji-weight-semibold: 600;
  --yueji-weight-bold: 700;

}

/* Dark mode tokens (kept minimal, mostly light usage) */
.dark {
  --yueji-background: #171717;
  --yueji-surface: #262626;
  --yueji-surface-elevated: #404040;
  --yueji-surface-muted: #262626;
  --yueji-text-primary: #fafafa;
  --yueji-text-secondary: #a3a3a3;
  --yueji-text-tertiary: #737373;
  --yueji-border: #404040;
  --yueji-border-strong: #525252;
  --yueji-divider: #333333;
}

/* Typography classes */
.yueji-display {
  font-family: var(--yueji-font-display);
  font-size: var(--yueji-text-3xl);
  line-height: var(--yueji-leading-tight);
  font-weight: var(--yueji-weight-bold);
  letter-spacing: -0.02em;
}

.yueji-h1 {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-2xl);
  line-height: var(--yueji-leading-tight);
  font-weight: var(--yueji-weight-bold);
}

.yueji-h2 {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-xl);
  line-height: var(--yueji-leading-snug);
  font-weight: var(--yueji-weight-semibold);
}

.yueji-h3 {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-lg);
  line-height: var(--yueji-leading-snug);
  font-weight: var(--yueji-weight-semibold);
}

.yueji-body {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-base);
  line-height: var(--yueji-leading-normal);
  font-weight: var(--yueji-weight-normal);
}

.yueji-body-sm {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-sm);
  line-height: var(--yueji-leading-normal);
  font-weight: var(--yueji-weight-normal);
}

.yueji-caption {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-xs);
  line-height: var(--yueji-leading-normal);
  font-weight: var(--yueji-weight-normal);
}

.yueji-label {
  font-family: var(--yueji-font-sans);
  font-size: var(--yueji-text-sm);
  line-height: var(--yueji-leading-snug);
  font-weight: var(--yueji-weight-medium);
}

/* Utility semantic helpers */
.yueji-text-primary { color: var(--yueji-text-primary); }
.yueji-text-secondary { color: var(--yueji-text-secondary); }
.yueji-text-tertiary { color: var(--yueji-text-tertiary); }
.yueji-text-brand { color: var(--yueji-primary-500); }
.yueji-text-success { color: var(--yueji-state-success); }
.yueji-text-error { color: var(--yueji-state-error); }

.yueji-bg-brand { background-color: var(--yueji-primary-500); }
.yueji-bg-brand-soft { background-color: var(--yueji-primary-50); }
.yueji-bg-surface { background-color: var(--yueji-surface); }
.yueji-bg-muted { background-color: var(--yueji-surface-muted); }
.yueji-bg-success-soft { background-color: var(--yueji-state-success-bg); }

.yueji-border-subtle { border-color: var(--yueji-border); }
.yueji-border-strong { border-color: var(--yueji-border-strong); }

/* Glassmorphism & High-end UI Effects */
.yueji-glass {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.yueji-glass-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 204, 215, 0.3);
  box-shadow: 0 8px 32px rgba(250, 70, 111, 0.05);
}

/* Micro-animations & Pulse Waves */
@keyframes yueji-pulse-ring {
  0% { transform: scale(0.95); opacity: 0.8; box-shadow: 0 0 0 0 rgba(250, 70, 111, 0.4); }
  70% { transform: scale(1.05); opacity: 1; box-shadow: 0 0 0 16px rgba(250, 70, 111, 0); }
  100% { transform: scale(0.95); opacity: 0.8; box-shadow: 0 0 0 0 rgba(250, 70, 111, 0); }
}

.yueji-pulse-wave {
  animation: yueji-pulse-ring 2.5s infinite ease-in-out;
}

/* Stealth / Panic Cover Layer */
#yueji-stealth-cover {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999999;
  background-color: #f8fafc;
  color: #1e293b;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow-y: auto;
}