:root{--bg:#f7f3ec;--paper:#fffdf8;--ink:#1c1b18;--muted:#6d675f;--line:#e2d8c9;--accent:#8a5a2b;--blue:#1f4e79;}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC",Arial,sans-serif;line-height:1.85;font-size:18px}.site-header{position:sticky;top:0;z-index:20;background:rgba(247,243,236,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.nav{max-width:1220px;margin:auto;padding:14px 22px;display:flex;justify-content:space-between;gap:16px}.brand{font-weight:800;color:var(--blue);text-decoration:none}.nav-links a{color:var(--muted);text-decoration:none;margin-left:18px}.hero{max-width:1180px;margin:42px auto 24px;padding:0 22px}.hero-card{background:linear-gradient(135deg,#fffdf8,#f1e4d1);border:1px solid var(--line);border-radius:26px;padding:46px;box-shadow:0 18px 45px rgba(77,54,28,.08)}h1{font-size:42px;line-height:1.2;margin:0 0 16px}h2{font-size:29px;line-height:1.35;margin:38px 0 14px;color:var(--blue)}h3{font-size:22px;margin:26px 0 8px}.subtitle{font-size:22px;color:var(--muted)}.centerline{font-size:24px;font-weight:750;margin:28px 0;color:var(--accent)}.btn{display:inline-block;margin:10px 12px 0 0;padding:10px 16px;border-radius:12px;text-decoration:none;background:var(--blue);color:#fff}.btn.secondary{background:#efe5d8;color:var(--accent)}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin-top:28px}.card,.toc-part{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:20px}.toc-grouped{max-width:980px;margin:30px auto;padding:0 22px}.toc-part{margin:18px 0}.toc-part h2{margin-top:0}.toc-item{display:block;padding:8px 0;color:var(--ink);text-decoration:none;border-bottom:1px dashed #eadfce}.toc-item span{color:var(--muted);font-size:15px}.layout{max-width:1320px;margin:28px auto;display:grid;grid-template-columns:320px minmax(0,1fr);gap:28px;padding:0 22px}.sidebar{position:sticky;top:76px;align-self:start;max-height:calc(100vh - 92px);overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:18px}.side-part{font-weight:800;color:var(--blue);margin:14px 0 6px}.sidebar a{display:block;color:var(--muted);text-decoration:none;padding:4px 0 4px 12px;font-size:15px}.sidebar a.active{color:var(--blue);font-weight:800;background:#f3eadc;border-radius:8px}.search{width:100%;padding:10px;border:1px solid var(--line);border-radius:10px;margin-bottom:12px}.article{background:var(--paper);border:1px solid var(--line);border-radius:22px;padding:44px;box-shadow:0 12px 35px rgba(77,54,28,.06)}.article p{margin:0 0 18px;text-align:justify}.article-nav{display:flex;justify-content:space-between;border-top:1px solid var(--line);margin-top:38px;padding-top:22px}.article-nav a{color:var(--blue);text-decoration:none;font-weight:700}.meta{color:var(--muted)}@media(max-width:900px){body{font-size:17px}.layout{display:block}.sidebar{position:relative;top:auto;max-height:none;margin-bottom:20px}h1{font-size:33px}.hero-card,.article{padding:26px}.nav{display:block}.nav-links a{margin:0 14px 0 0}}