:root{--bg:#f7f3ec;--paper:#fffdf8;--ink:#24211c;--muted:#71695e;--line:#ded5c7;--accent:#275d50;--accent2:#8a4f28}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.78}
a{color:inherit;text-decoration:none}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,243,236,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.nav{max-width:1180px;margin:0 auto;padding:14px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{font-weight:700;color:var(--accent)}
.nav-links{display:flex;gap:18px;color:var(--muted);font-size:15px}
.hero{min-height:72vh;display:flex;align-items:center;background:linear-gradient(rgba(39,93,80,.72),rgba(36,33,28,.52)),url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?auto=format&fit=crop&w=1800&q=80') center/cover}
.hero-card{max-width:920px;margin:0 auto;padding:48px 24px;color:#fff}
.eyebrow{letter-spacing:0;text-transform:uppercase;font-size:13px;font-weight:700;color:#c9ddcf}
h1{font-size:clamp(34px,6vw,66px);line-height:1.12;margin:12px 0 18px;letter-spacing:0}
.subtitle{font-size:20px;max-width:780px}
.center-line{font-size:24px;font-weight:700;max-width:820px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border:1px solid rgba(255,255,255,.72);border-radius:6px;color:#fff}
.button.primary{background:#fff;color:var(--accent);border-color:#fff}
.mainlines,.toc-entry,.toc-page,.page-title{max-width:1180px;margin:0 auto;padding:52px 22px}
.mainlines{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.mainlines article{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:22px}
.mainlines h2,.toc-entry h2,.page-title h1{margin-top:0}
.toc-grouped{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.toc-part{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:16px}
.toc-part h3{font-size:15px;color:var(--accent2);margin:0 0 10px}
.toc-item{display:block;padding:8px 10px;border-radius:6px;color:var(--ink);font-size:15px}
.toc-item:hover,.toc-item.active{background:#efe5d6;color:var(--accent)}
.layout{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:310px minmax(0,1fr);gap:28px;padding:28px 22px 64px}
.sidebar{position:sticky;top:74px;align-self:start;max-height:calc(100vh - 92px);overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:14px}
.sidebar .toc-grouped{display:block}
.sidebar .toc-part{border:0;background:transparent;padding:8px 0}
.search{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:6px;margin-bottom:10px;background:#fff;color:var(--ink)}
.article{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:42px;min-width:0}
.article h1{font-size:38px;color:var(--accent)}
.article h2{margin-top:38px;color:var(--accent)}
.article h3{margin-top:26px;color:var(--accent2)}
.article p{font-size:18px;margin:16px 0}
.article li{font-size:17px;margin:6px 0}
.article blockquote{border-left:4px solid var(--accent);margin:20px 0;padding:8px 18px;background:#f1eadf;color:var(--muted)}
.article-nav{border-top:1px solid var(--line);margin-top:44px;padding-top:20px;display:flex;justify-content:space-between;gap:18px;color:var(--accent);font-weight:700}
code{background:#efe5d6;padding:2px 5px;border-radius:4px}
@media(max-width:860px){.nav{align-items:flex-start;flex-direction:column}.mainlines{grid-template-columns:1fr}.layout{display:block;padding:18px 14px}.sidebar{position:static;max-height:none;margin-bottom:18px}.article{padding:24px 18px}.article h1{font-size:30px}.article p{font-size:16px}.hero{min-height:68vh}.hero-card{padding:36px 20px}.center-line{font-size:20px}}