:root{--bg-primary: #FFFFFF;--bg-secondary: #FFFFFF;--bg-tertiary: #F7F7F7;--text-primary: #1A1A1A;--text-secondary: #666666;--text-muted: #999999;--accent: #1A1A1A;--border: #E5E5E5;--font-serif: 'Playfair Display', 'Noto Serif SC', Georgia, serif;--font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;--font-mono: 'JetBrains Mono', 'Fira Code', monospace;--text-xs: 0.75rem;--text-sm: 0.875rem;--text-base: 1.125rem;--text-lg: 1.25rem;--text-xl: 1.5rem;--text-2xl: 2rem;--text-3xl: 2.5rem;--text-4xl: 3.5rem;--leading-tight: 1.3;--leading-normal: 1.7;--leading-relaxed: 1.9;--width-article: 680px;--width-medium: 900px;--width-wide: 1100px;--width-full: 1400px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px}[data-mode=dark]{--bg-primary: #0A0A0A;--bg-secondary: #0A0A0A;--bg-tertiary: #141414;--text-primary: #EEEEEE;--text-secondary: #A3A3A3;--text-muted: #737373;--accent: #FFFFFF;--border: 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