:root{--bg:#0b1220;--panel:#0f172a;--text:#e5e7eb;--muted:#94a3b8;--brand:#10b981;--line:#1f2937}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:linear-gradient(180deg,#0b1220,#0f172a);color:var(--text);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}
.container{max-width:820px;margin:0 auto;padding:20px}
.book-header{position:sticky;top:0;background:rgba(11,18,32,.8);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line);z-index:10}
.header-inner{display:flex;align-items:center;gap:16px}
.brand{font-weight:800;text-decoration:none;color:#fff}
.brand span{color:var(--brand)}
.top-links{margin-left:auto;display:flex;gap:16px;align-items:center}
.top-links a{color:#fff;text-decoration:none}
.btn{background:var(--brand);color:#062b1f;padding:8px 12px;border-radius:8px;text-decoration:none}
h1,h2{line-height:1.2;margin-top:8px}
p{color:#dbe2ea}
article{background:#0c1323;border:1px solid var(--line);border-radius:12px;padding:22px}
.toc a{display:block;padding:10px 0;border-bottom:1px solid var(--line);color:#fff;text-decoration:none}
.chapter-nav{display:flex;justify-content:space-between;gap:12px;margin:28px 0}
.chapter-nav a{color:#fff;text-decoration:none;background:#111827;padding:10px 14px;border-radius:8px;border:1px solid var(--line)}
.book-footer{border-top:1px solid var(--line);padding:16px 0}
blockquote{border-left:3px solid var(--brand);padding-left:12px;color:#cbd5e1;margin:18px 0}