:root{--ink:#1b1a24;--ink2:#4a4857;--paper:#faf7f2;--paper2:#f0ece2;--card:#fffdfa;--line:#e2dccf;--line2:#cbc3b1;--acc:hsl(123 70% 45%);--acc2:hsl(123 70% 38%);--accbg:hsl(123 76% 95%);--mut:#8a8575;--serif:"Noto Serif SC",Georgia,"Songti SC",serif;--sans:-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;--mono:"SFMono-Regular",ui-monospace,Menlo,Consolas,monospace}
*{box-sizing:border-box}html{background:var(--paper)}
.ixb510c1{margin:0;background:var(--paper);color:var(--ink);font:15.5px/1.75 var(--sans)}
a{color:inherit;text-decoration:none}img{display:block}
.ixb510c1-skip{position:absolute;left:-999px}.ixb510c1-skip:focus{left:10px;top:10px;background:var(--ink);color:#fff;padding:8px 12px;z-index:60}
.ixb510c1-top{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:22px;padding:14px 32px;background:rgba(250,247,242,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line2)}
.ixb510c1-logo{display:flex;align-items:center;gap:10px;flex:none}.ixb510c1-lmk{width:32px;height:32px;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-weight:900;font-size:18px;border-radius:3px}.ixb510c1-lt{font-family:var(--serif);font-weight:900;font-size:19px;letter-spacing:-.3px}
.ixb510c1-topnav{display:flex;gap:18px;flex:1;overflow:auto;white-space:nowrap}.ixb510c1-topnav a{font-size:14px;font-weight:600;color:var(--ink2);padding:4px 0;border-bottom:2px solid transparent}.ixb510c1-topnav a:hover{color:var(--acc);border-color:var(--acc)}
.ixb510c1-q{flex:none;border:1px solid var(--line2);border-radius:20px;padding:6px 14px;background:var(--card)}.ixb510c1-q input{border:0;background:transparent;outline:none;font-size:13px;width:110px;color:var(--ink)}
main{max-width:1180px;margin:0 auto;padding:0 32px}
.ixb510c1-mast{padding:52px 0 30px;border-bottom:1px solid var(--line2);text-align:left}
.ixb510c1-mast-sub{padding:34px 0 22px}
.ixb510c1-mkick{font-family:var(--mono);font-size:11px;letter-spacing:3px;text-transform:uppercase;color:var(--acc);font-weight:700}
.ixb510c1-mast h1{font-family:var(--serif);font-size:clamp(34px,6vw,64px);font-weight:900;letter-spacing:-1.4px;line-height:1.02;margin:14px 0 16px;text-align:left}
.ixb510c1-mlede{color:var(--ink2);font-size:17px;line-height:1.8;max-width:62ch;margin:0}
.ixb510c1-crumb{font-family:var(--mono);font-size:11px;color:var(--mut);margin-bottom:6px}.ixb510c1-crumb a:hover{color:var(--acc)}.ixb510c1-crumb span{color:var(--ink)}
.ixb510c1-contents{padding:34px 0;border-bottom:1px solid var(--line2)}
.ixb510c1-ch-h{display:flex;align-items:baseline;gap:16px;margin-bottom:18px}.ixb510c1-ch-h span:first-child{font-family:var(--serif);font-size:26px;font-weight:900;letter-spacing:6px}.ixb510c1-ch-en{font-family:var(--mono);font-size:11px;letter-spacing:3px;color:var(--mut)}
.ixb510c1-toc{list-style:none;margin:0;padding:0;columns:2;column-gap:56px}
.ixb510c1-toc li{break-inside:avoid;margin:0 0 4px}
.ixb510c1-toc a{display:flex;align-items:baseline;gap:10px;padding:9px 0;border-bottom:1px solid var(--line)}
.ixb510c1-tc-no{font-family:var(--serif);font-size:13px;font-weight:700;color:var(--acc);width:34px;flex:none}
.ixb510c1-tc-nm{font-weight:600;font-size:16px}.ixb510c1-toc a:hover .ixb510c1-tc-nm{color:var(--acc)}
.ixb510c1-tc-dot{flex:1;border-bottom:1.5px dotted var(--line2);transform:translateY(-4px)}
.ixb510c1-tc-pg{font-family:var(--mono);font-size:12px;color:var(--mut)}
.ixb510c1-spread{display:grid;grid-template-columns:200px 1fr;gap:48px;align-items:start;padding-top:36px}
.ixb510c1-rail{position:sticky;top:78px}
.ixb510c1-railin .ixb510c1-rk{font-family:var(--mono);font-size:10px;letter-spacing:2px;text-transform:uppercase;color:var(--mut);display:block;margin-bottom:10px}
.ixb510c1-railin ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.ixb510c1-railin li a{display:flex;align-items:center;gap:9px;padding:7px 0 7px 14px;margin-left:-2px;border-left:2px solid transparent;font-size:13.5px;color:var(--mut);line-height:1.3}
.ixb510c1-railin li a i{font-style:normal;font-family:var(--serif);font-size:12px;font-weight:700;opacity:.6}
.ixb510c1-railin li a:hover,.ixb510c1-railin li a.on{color:var(--acc);border-color:var(--acc);font-weight:700}.ixb510c1-railin li a.on i{opacity:1}
.ixb510c1-scroll{min-width:0}
.ixb510c1-chap{margin-bottom:56px;scroll-margin-top:80px}
.ixb510c1-chh{display:flex;align-items:flex-start;gap:18px;padding-bottom:16px;margin-bottom:26px;border-bottom:2px solid var(--ink)}
.ixb510c1-chno{font-family:var(--serif);font-size:44px;font-weight:900;line-height:.8;color:var(--acc);flex:none;min-width:52px}
.ixb510c1-chh h2{font-family:var(--serif);font-size:clamp(22px,3vw,30px);font-weight:900;letter-spacing:-.5px;margin:0 0 4px}
.ixb510c1-chh p{color:var(--mut);font-size:14px;margin:0;max-width:54ch}
.ixb510c1-chall{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--acc);white-space:nowrap;align-self:center;border-bottom:1px solid var(--acc)}
.ixb510c1-feats{display:flex;flex-direction:column;gap:38px}
.ixb510c1-feat{display:grid;grid-template-columns:1.05fr 1fr;gap:30px;align-items:center}
.ixb510c1-feat:nth-child(even){grid-template-columns:1fr 1.05fr}
.ixb510c1-feat:nth-child(even) .ixb510c1-fimg{order:2}
.ixb510c1-fimg{position:relative;aspect-ratio:3/4;max-height:340px;overflow:hidden;border-radius:4px;background:var(--paper2)}
.ixb510c1-fimg img{width:100%;height:100%;object-fit:cover;transition:.4s}.ixb510c1-feat:hover .ixb510c1-fimg img{transform:scale(1.045)}
.ixb510c1-fdur{position:absolute;right:10px;bottom:10px;background:rgba(0,0,0,.72);color:#fff;font-family:var(--mono);font-size:11px;padding:3px 8px;border-radius:3px}
.ixb510c1-fhot{position:absolute;left:10px;top:10px;background:var(--acc);color:#fff;font-size:11px;font-weight:700;padding:3px 9px;border-radius:3px}
.ixb510c1-ftx{min-width:0}
.ixb510c1-fno{font-family:var(--serif);font-size:13px;font-weight:700;color:var(--line2);letter-spacing:1px}
.ixb510c1-fkick{font-family:var(--mono);font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--acc);font-weight:700;margin-left:10px}
.ixb510c1-ftx h3{font-family:var(--serif);font-size:clamp(20px,2.6vw,27px);font-weight:900;letter-spacing:-.5px;line-height:1.18;margin:10px 0 10px}
.ixb510c1-feat:hover .ixb510c1-ftx h3{color:var(--acc)}
.ixb510c1-ftx p{color:var(--ink2);font-size:15px;line-height:1.72;margin:0 0 12px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.ixb510c1-fmini{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:12px}.ixb510c1-fmini em{font-style:normal;font-family:var(--mono);font-size:12px;color:var(--mut)}
.ixb510c1-fgo{font-weight:700;color:var(--acc);border-bottom:2px solid var(--acc);padding-bottom:2px}
.ixb510c1-tags{display:flex;flex-wrap:wrap;gap:10px}
.ixb510c1-tags a{display:inline-flex;align-items:center;gap:7px;padding:8px 15px;background:var(--card);border:1px solid var(--line);border-radius:22px;font-size:13.5px}
.ixb510c1-tags a:hover{border-color:var(--acc);color:var(--acc);background:var(--accbg)}.ixb510c1-tags i{font-style:normal;font-size:11px;color:var(--mut)}
.ixb510c1-faq details{border-bottom:1px solid var(--line)}.ixb510c1-faq summary{cursor:pointer;padding:16px 30px 16px 0;font-family:var(--serif);font-weight:700;font-size:17px;list-style:none;position:relative}.ixb510c1-faq summary::-webkit-details-marker{display:none}.ixb510c1-faq summary:after{content:"+";position:absolute;right:4px;top:13px;font-size:22px;color:var(--acc)}.ixb510c1-faq details[open] summary:after{content:"−"}.ixb510c1-faq p{margin:0 0 16px;color:var(--ink2)}
.ixb510c1-article{max-width:780px;margin:0 auto;padding-top:34px}
.ixb510c1-article-wide{max-width:900px}
.ixb510c1-at{font-family:var(--serif);font-size:clamp(26px,3.8vw,42px);font-weight:900;letter-spacing:-.6px;line-height:1.1;margin:8px 0 12px;text-align:left}
.ixb510c1-ameta{display:flex;flex-wrap:wrap;gap:16px;font-family:var(--mono);font-size:12px;color:var(--mut);border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:22px}
.ixb510c1-prose{font-family:var(--serif);font-size:17.5px}.ixb510c1-prose p{margin:0 0 18px;line-height:1.95}
.ixb510c1-hlbox{border-left:3px solid var(--acc);padding:4px 20px;margin:22px 0;background:var(--accbg);border-radius:0 6px 6px 0}.ixb510c1-hlbox h3{font-family:var(--mono);font-size:12px;letter-spacing:2px;text-transform:uppercase;margin:12px 0 8px;color:var(--acc2)}.ixb510c1-hlbox ul{margin:0 0 14px;padding-left:18px}.ixb510c1-hlbox li{margin:6px 0}
.ixb510c1-atags{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}.ixb510c1-atags a{font-family:var(--mono);font-size:12.5px;color:var(--acc)}
.ixb510c1-reader{display:flex;flex-direction:column;align-items:center;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:#fff;margin:8px 0}.ixb510c1-page{width:100%;max-width:760px;height:auto;display:block}
.ixb510c1-readend{text-align:center;color:var(--mut);margin:16px 0;font-family:var(--serif)}
.ixb510c1-progress{position:sticky;top:58px;height:3px;z-index:45;background:var(--line)}.ixb510c1-progress i{display:block;height:3px;width:0;background:var(--acc)}
.ixb510c1-note{color:var(--mut);font-size:12.5px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;margin:22px 0;line-height:1.6}
.ixb510c1-pager{display:flex;justify-content:space-between;gap:16px;margin:26px 0;font-family:var(--serif)}.ixb510c1-pager a{font-weight:700;max-width:46%}.ixb510c1-pager a:hover{color:var(--acc)}
.ixb510c1-idx{columns:2;column-gap:36px;list-style:none;margin:0;padding:0}.ixb510c1-idx li{margin:0 0 8px;break-inside:avoid;font-family:var(--serif);font-size:15px}.ixb510c1-idx a:hover{color:var(--acc)}
.ixb510c1-empty{color:var(--mut);padding:30px 0;font-family:var(--serif)}
.ixb510c1-foot{max-width:1180px;margin:60px auto 0;padding:40px 32px;border-top:3px solid var(--ink);display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:36px}
.ixb510c1-fcol h4{font-family:var(--serif);font-size:15px;font-weight:900;margin:0 0 12px}
.ixb510c1-ftags a{display:inline-block;font-family:var(--mono);font-size:12px;color:var(--ink2);margin:0 12px 7px 0}.ixb510c1-ftags a:hover{color:var(--acc)}
.ixb510c1-fcol nav{display:flex;flex-direction:column;gap:7px}.ixb510c1-fcol nav a{font-size:13.5px;color:var(--ink2)}.ixb510c1-fcol nav a:hover{color:var(--acc)}
.ixb510c1-fcol p{color:var(--mut);font-size:13px;line-height:1.6;margin:0 0 10px}.ixb510c1-fcol>a{display:block;font-family:var(--mono);font-size:12px;color:var(--acc);margin-top:6px}
@media(max-width:900px){.ixb510c1-spread{grid-template-columns:1fr;gap:0}.ixb510c1-rail{display:none}.ixb510c1-toc{columns:1}.ixb510c1-foot{grid-template-columns:1fr 1fr}}
@media(max-width:620px){main{padding:0 18px}.ixb510c1-top{padding:12px 18px;gap:14px}.ixb510c1-feat,.ixb510c1-feat:nth-child(even){grid-template-columns:1fr;gap:14px}.ixb510c1-feat:nth-child(even) .ixb510c1-fimg{order:0}.ixb510c1-fimg{aspect-ratio:16/10;max-height:none}.ixb510c1-foot{grid-template-columns:1fr;padding:30px 18px}.ixb510c1-mast{padding:34px 0 22px}}

/* ===== per-site mutation (67) ===== */
:root{--radius:16px;--sh2:0 3px 0 rgba(10,10,20,.22)}
.ixb510c1{background-image:radial-gradient(1200px 680px at 71% -8%,color-mix(in srgb,var(--acc) 11%,transparent),transparent 70%);background-attachment:fixed}
.ixb510c1 h1,.ixb510c1 h2{letter-spacing:-.5px;font-weight:900}
.ixb510c1-sec{margin-top:44px}
.ixb510c1-card,.ixb510c1-tile,.ixb510c1-book,.ixb510c1-big,.ixb510c1-qi{border-color:transparent!important}
.ixb510c1-pcov,.ixb510c1-tcov,.ixb510c1-bcov,.ixb510c1-cover,.ixb510c1-poster,.ixb510c1-cov{border-radius:10px}
.ixb510c1-card:hover,.ixb510c1-tile:hover,.ixb510c1-book:hover,.ixb510c1-big:hover{transform:translateY(-4px)}