:root{--background: #FAF9F6;--background-subtle: #F2F0EA;--background-secondary: #F5F5F5;--text-primary: #1A1A1A;--text-secondary: #4A4A4A;--text-muted: #8C8C8C;--text-tertiary: #B0B0B0;--link: #6B4423;--link-hover: #C75D3F;--border-subtle: #E5E2D9;--border-secondary: #D4D4D4;--border-strong: #A0A0A0;--accent-blue: #2A3F5F;--diagram-surface: #FBFAF6;--diagram-line: #E3E0D8;--diagram-line-strong: #D2CCC0;--diagram-text: #1A1A1A;--diagram-text-secondary: #555555;--diagram-text-muted: #8A8A85;--diagram-fill: #F2F5F8;--diagram-fill-strong: #D8E0E8;--diagram-accent: #8799A8;--diagram-accent-text: #516575;--diagram-risk-fill: #F7F1ED;--diagram-risk-accent: #A7836F;--diagram-paper: var(--diagram-fill);--diagram-blue-fill: var(--diagram-fill);--diagram-blue-fill-strong: var(--diagram-fill-strong);--diagram-blue-accent: var(--diagram-accent);--diagram-blue-text: var(--diagram-accent-text);--diagram-sage-fill: var(--diagram-fill);--diagram-sage-fill-strong: var(--diagram-fill-strong);--diagram-sage-accent: var(--diagram-accent);--diagram-sage-text: var(--diagram-accent-text);--diagram-clay-fill: var(--diagram-fill);--diagram-clay-fill-strong: var(--diagram-fill-strong);--diagram-clay-accent: var(--diagram-accent);--diagram-clay-text: var(--diagram-accent-text);--diagram-gold-fill: var(--diagram-fill);--diagram-gold-fill-strong: var(--diagram-fill-strong);--diagram-gold-accent: var(--diagram-accent);--diagram-gold-text: var(--diagram-accent-text);--diagram-slate-fill: var(--diagram-fill);--diagram-slate-fill-strong: var(--diagram-fill-strong);--diagram-slate-accent: var(--diagram-accent);--diagram-slate-text: var(--diagram-accent-text);--font-family-zh: "Noto Serif SC", serif;--font-family-title: "PingFang SC", "Microsoft YaHei", "微软雅黑", sans-serif;--font-family-en: "Crimson Pro", serif;--font-family-mono: "JetBrains Mono", monospace;--font-family-article-text: "STKaiti", "华文楷体", serif;--font-family-article-title: "PingFang SC", "Microsoft 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