:root{--bg:#fbfaf7;--fg:#24211d;--muted:#6b6258;--card:#fff;--line:#e8dfd3;--accent:#8b5e34;--accent2:#5f7f52;}
*{box-sizing:border-box} body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Serif SC","Source Han Serif SC","Microsoft YaHei",serif;line-height:1.9;}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
.site{max-width:1100px;margin:0 auto;padding:28px 18px 60px}.hero{padding:34px 0 20px;border-bottom:1px solid var(--line);margin-bottom:26px}.hero h1{margin:0 0 8px;font-size:2.2rem;letter-spacing:.03em}.hero p{margin:0;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:0 1px 8px rgba(0,0,0,.035)}.card .num{font-size:.85rem;color:var(--muted);display:block;margin-bottom:4px}
.layout{display:grid;grid-template-columns:280px 1fr;gap:26px}.toc{position:sticky;top:18px;align-self:start;max-height:calc(100vh - 36px);overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}.toc h2{font-size:1rem;margin:0 0 10px}.toc ul{list-style:none;padding:0;margin:0}.toc li{margin:7px 0;font-size:.94rem}.toc .active a{font-weight:700;color:var(--accent2)}
.article{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:34px;min-width:0}.article h1{line-height:1.25;margin-top:0}.article h2,.article h3{line-height:1.35;margin-top:1.7em}.article p{margin:1em 0}.article blockquote{border-left:4px solid var(--line);margin:1.2em 0;padding:.2em 1em;color:var(--muted);background:#f7f1ea}.article img{max-width:100%}.toplink{display:inline-block;margin-bottom:18px}.footer{color:var(--muted);font-size:.9rem;margin-top:28px;text-align:center}
@media(max-width:820px){.layout{display:block}.toc{position:static;margin-bottom:18px}.article{padding:22px}.hero h1{font-size:1.75rem}}
@media(prefers-color-scheme:dark){:root{--bg:#171411;--fg:#eee7df;--muted:#b8aa9c;--card:#211d19;--line:#3a312a;--accent:#e0b37b;--accent2:#aac594}.card,.article,.toc{box-shadow:none}}