:root{--bg: #f8f9fb;--surface: #ffffff;--border: #e2e8f0;--text: #1a202c;--muted: #64748b;--accent: #2563eb;--accent-lt: #dbeafe;--accent-dk: #1d4ed8;--tag-bg: #eff6ff;--tag-text: #1d4ed8;--shadow: 0 1px 3px rgba(0,0,0,.07), 0 4px 16px rgba(0,0,0,.05);--radius: 12px;--font-serif: "DM Serif Display", Georgia, serif;--font-sans: "DM Sans", system-ui, sans-serif}[data-theme=dark]{--bg: #0f172a;--surface: #1e293b;--border: #334155;--text: #f1f5f9;--muted: #94a3b8;--accent: #60a5fa;--accent-lt: #1e3a5f;--accent-dk: #93c5fd;--tag-bg: #1e3a5f;--tag-text: #93c5fd}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);transition:background .3s,color .3s;line-height:1.6}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.container{max-width:760px;margin:0 auto;padding:0 24px}header{position:sticky;top:0;z-index:100;background:var(--bg);border-bottom:1px solid 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