:root{--ink:#20252b;--muted:#68717c;--line:#dde2e6;--paper:#fff;--soft:#f5f7f8;--accent:#176b5b;--accent-dark:#0f5145;--code:#17212b}
html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75}a{color:var(--accent)}a:hover,a:focus{color:var(--accent-dark)}img{max-width:100%;height:auto}.skip-link{position:absolute;left:-9999px;top:0}.skip-link:focus{left:12px;top:8px;z-index:1000;background:#fff;padding:8px 12px}.page-shell{max-width:1140px}.reading-shell{max-width:810px}
.site-header{position:sticky;top:0;z-index:100;border-bottom:1px solid var(--line);background:rgba(255,255,255,.97)}.header-inner{width:100%;max-width:1140px;min-height:72px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1fr auto;align-items:center}.brand{color:var(--ink);font-size:21px;font-weight:700;letter-spacing:.02em}.brand:hover{text-decoration:none}.brand-mark{color:var(--accent);margin-right:7px}.site-nav{display:flex;align-items:center;gap:30px}.site-nav a{color:#424950;font-size:15px}.site-nav a.active{color:var(--accent);font-weight:600}.menu-toggle{display:none;border:1px solid var(--line);border-radius:4px;background:#fff;padding:7px 10px}
.eyebrow{color:var(--accent);font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.intro{padding:70px 0 54px}.intro h1{max-width:820px;margin:12px 0 20px;font-size:44px;line-height:1.3;letter-spacing:-.02em}.intro-copy{max-width:760px;color:#505963;font-size:18px}.intro-actions{display:flex;gap:24px;margin-top:25px}.text-link{font-weight:700}.section{padding:54px 0}.section+.section{border-top:1px solid var(--line)}.section-heading{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:10px}.section-heading h2{margin:0;font-size:27px}.profile-note{max-width:780px;color:#4e5861;font-size:17px}
.post-row{display:flex;gap:32px;padding:30px 0;border-bottom:1px solid var(--line)}.post-content{min-width:0;flex:1}.meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:13px}.meta a{color:var(--muted)}.post-title{margin:8px 0 10px;font-size:24px;line-height:1.45}.post-title a{color:var(--ink)}.post-summary{margin:0 0 12px;color:#505963}.tag{display:inline-block;margin:2px 7px 2px 0;padding:1px 8px;border:1px solid #b8cbc5;border-radius:99px;color:var(--accent);font-size:12px}.post-cover{flex:0 0 220px;height:136px;overflow:hidden;border-radius:3px;background:var(--soft)}.post-cover img{width:100%;height:100%;object-fit:cover}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.topic{padding:20px 0;border-top:2px solid var(--accent);color:var(--ink)}.topic:hover{text-decoration:none}.topic h3{margin:0 0 8px;font-size:19px}.topic p{color:var(--muted)}
.page-head{padding:54px 0 26px}.page-head h1{margin:10px 0 12px;font-size:38px}.page-head p{max-width:720px;color:var(--muted);font-size:17px}.page-head-centered{text-align:center}.filter-line{display:flex;flex-wrap:wrap;gap:8px 24px;padding:13px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.filter-line a{color:#465059}.filter-line a.active{color:var(--accent);font-weight:700}.post-list.section{padding-top:16px}.pagination-wrap{text-align:center}.pagination>li>a,.pagination>li>span{color:var(--accent);border-color:var(--line)}.pagination>.active>a,.pagination>.active>span{background:var(--accent);border-color:var(--accent)}.empty-state{margin:30px 0;padding:22px;border-left:3px solid var(--accent);background:var(--soft)}.empty-state p{margin:5px 0 0}.search-form{display:flex;max-width:700px;gap:10px}.search-form .form-control{height:44px;border-color:#bcc6cc;box-shadow:none}.btn-search{flex:0 0 auto;border:0;border-radius:4px;background:var(--accent);padding:0 24px;color:#fff}
.article-header{max-width:900px;padding:56px 20px 35px;border-bottom:1px solid var(--line);text-align:center}.article-header h1{margin:12px auto 18px;font-size:42px;line-height:1.32}.article-lead{max-width:760px;margin:0 auto 15px;color:#59636d;font-size:18px}.article-header .meta{justify-content:center;margin-bottom:12px;font-weight:600}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 230px;gap:64px;justify-content:center;align-items:start}.article-body{min-width:0;font-family:"Songti SC",STSong,"SimSun",serif;font-size:17px;line-height:1.9}.article-body h2,.article-body h3,.article-body h4{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;scroll-margin-top:95px}.article-body h2{margin:2em 0 .75em;font-size:28px}.article-body h3{margin:1.7em 0 .65em;font-size:23px}.article-body h4{font-size:19px}.article-body p,.article-body ul,.article-body ol{margin-bottom:1.35em}.article-body blockquote{margin:28px 0;padding:8px 20px;border-left:3px solid var(--accent);background:var(--soft);color:#48524d}.article-body blockquote p:last-child{margin-bottom:0}.article-body code{color:#8d3030;background:#f1f3f4}.article-body pre{overflow-x:auto;margin:26px 0;padding:20px;border:0;border-radius:4px;background:var(--code);color:#e7edf2;white-space:pre}.article-body pre code{padding:0;background:transparent;color:inherit}.article-body table{min-width:620px;width:100%;margin:25px 0;border-collapse:collapse}.article-body th,.article-body td{padding:10px 12px;border:1px solid var(--line)}.article-body th{background:var(--soft)}.article-body .table-scroll{overflow-x:auto}.article-body figure{margin:30px 0}.article-body figcaption{text-align:center;color:var(--muted);font-size:13px}.article-body hr{margin:38px 0;border-color:var(--line)}.article-aside{min-width:0}.toc{position:sticky;top:98px;padding-left:18px;border-left:1px solid var(--line);font-size:14px}.toc-title{margin-bottom:10px;font-weight:700}.toc a{display:block;padding:4px 0;color:#626b73}.toc .toc-sub{padding-left:14px;font-size:13px}.toc-toggle{display:none}.toc.is-empty,.toc-toggle.is-empty{display:none!important}.author-box{margin:46px 0 30px;padding:22px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}.author-box strong{display:block;margin-bottom:4px}.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:30px 0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}.post-nav a{padding:16px;background:var(--soft)}.post-nav small{display:block;color:var(--muted)}.static-page{padding-bottom:30px}
.archive-groups{max-width:850px;padding-bottom:40px}.archive-group{display:grid;grid-template-columns:120px 1fr;padding:26px 0;border-top:1px solid var(--line)}.archive-group h2{margin:0;font-size:23px}.archive-group ol{list-style:none;margin:0;padding:0}.archive-group li{display:grid;grid-template-columns:58px 1fr;gap:14px;padding:6px 0}.archive-group time{color:var(--muted);font-variant-numeric:tabular-nums}.link-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;padding-bottom:35px}.friend-link{display:block;padding:22px;border:1px solid var(--line);color:var(--ink)}.friend-link:hover{text-decoration:none;border-color:#9eb8af}.friend-link img{width:32px;height:32px;margin-right:10px;border-radius:4px;object-fit:cover}.friend-link p{margin:9px 0;color:var(--muted)}.friend-link span{display:block;overflow:hidden;color:var(--accent);font-size:12px;text-overflow:ellipsis;white-space:nowrap}
.back-top{position:fixed;right:20px;bottom:96px;z-index:90;opacity:0;visibility:hidden;pointer-events:none;border:1px solid var(--line);border-radius:4px;background:#fff;padding:8px 11px;color:var(--accent);box-shadow:0 4px 16px rgba(32,37,43,.1);transition:opacity .15s,visibility .15s}.back-top.is-visible{opacity:1;visibility:visible;pointer-events:auto}.site-footer{margin-top:36px;border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:14px}.footer-inner{display:flex;justify-content:center;align-items:center;gap:48px;text-align:center}
@media(max-width:1199px){.article-layout{grid-template-columns:minmax(0,760px);gap:20px}.article-aside{order:-1}.toc{position:static;display:none;border:1px solid var(--line);padding:14px 18px}.toc.is-open{display:block}.toc-toggle{display:block;width:100%;text-align:left;border:1px solid var(--line);background:var(--soft);padding:10px 14px}}
@media(max-width:768px){body{font-size:15px}.header-inner{min-height:62px;padding:10px 20px;grid-template-columns:1fr auto;grid-template-rows:42px auto}.menu-toggle{display:block}.site-nav{display:flex;grid-column:1/-1;flex-direction:column;align-items:flex-start;gap:0;max-height:0;overflow:hidden;visibility:hidden;opacity:0;transform:translateY(-6px);pointer-events:none;margin-top:0;padding:0;border-top:1px solid transparent;transition:max-height .26s cubic-bezier(.4,0,.2,1),opacity .2s ease,transform .26s cubic-bezier(.4,0,.2,1),margin-top .26s ease,padding .26s ease,border-color .26s ease}.site-nav.is-open,.no-js .site-nav{max-height:70vh;overflow-y:auto;visibility:visible;opacity:1;transform:none;pointer-events:auto;margin-top:10px;padding:14px 0;border-top-color:var(--line)}.no-js .menu-toggle{display:none}.site-nav a{width:100%;padding:8px 0}.intro{padding:42px 0 36px}.intro h1,.article-header h1{font-size:31px}.intro-copy,.article-lead{font-size:16px}.section{padding:38px 0}.section-heading{align-items:start}.topic-grid{grid-template-columns:1fr}.post-row{gap:16px}.post-cover{flex-basis:112px;height:84px}.post-title{font-size:20px}.page-head{padding:38px 0 22px}.page-head h1{font-size:30px}.article-header{padding:40px 20px 26px;text-align:left}.article-header .meta{justify-content:flex-start}.article-body{font-size:16px;line-height:1.85}.article-body h2{font-size:24px}.article-body h3{font-size:20px}.post-nav,.link-grid{grid-template-columns:1fr}.footer-inner{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 36px}.archive-group{grid-template-columns:1fr}.archive-group h2{margin-bottom:12px}}
@media(max-width:768px) and (prefers-reduced-motion:reduce){.site-nav{transition:none}}
@media(max-width:480px){.post-row{flex-direction:column}.post-cover{order:-1;width:100%;height:150px}.section-heading{display:block}.search-form{display:block}.btn-search{width:100%;height:42px;margin-top:9px}.archive-group li{grid-template-columns:48px 1fr}}
@media print{.site-header,.article-aside,.back-top,.site-footer{display:none!important}.article-layout{display:block}}
.header-inner:before,.header-inner:after,.article-layout:before,.article-layout:after,.footer-inner:before,.footer-inner:after,.home-grid:before,.home-grid:after{display:none;content:none}
.article-body h1{margin:1.8em 0 .8em;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:32px;scroll-margin-top:95px}
.toc .toc-h2{padding-left:14px;font-size:13px}.toc .toc-h3{padding-left:28px;font-size:12px}

/* Gate 5: search, engagement and compact home widgets. */
.header-search{display:flex;width:180px;border:1px solid var(--line);border-radius:4px;overflow:hidden}.header-search input{min-width:0;width:100%;height:32px;border:0;padding:5px 8px;outline:0}.header-search button{display:flex;flex:0 0 38px;align-items:center;justify-content:center;width:38px;border:0;border-left:1px solid var(--line);background:var(--soft);padding:0;color:var(--accent);line-height:1}.header-search button svg{display:block;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}.header-search button:hover,.header-search button:focus{background:#e9efed;color:var(--accent-dark);outline:0}
.site-nav .nav-icon-link{display:flex;width:32px;height:32px;align-items:center;justify-content:center;color:#424950}.nav-icon-link svg{display:block;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}.site-nav .nav-icon-link:hover,.site-nav .nav-icon-link:focus{color:var(--accent);text-decoration:none}
.nav-notice-link{position:relative;display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;border:0;border-radius:50%;background:#c2410c;padding:0;color:#fff;box-shadow:0 3px 10px rgba(194,65,12,.32);transition:color .18s ease,background-color .18s ease,transform .18s ease,box-shadow .18s ease}.nav-notice-link:after{position:absolute;inset:-2px;border:3px solid rgba(234,88,12,.66);border-radius:50%;content:"";pointer-events:none;animation:notice-pulse 1.45s ease-out infinite}.nav-notice-link svg{position:relative;z-index:1;display:block;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;transform-origin:50% 50%;animation:notice-attention 2.9s ease-in-out infinite}.nav-notice-link:hover,.nav-notice-link:focus{background:#9a3412;color:#fff;box-shadow:0 4px 13px rgba(154,52,18,.4);transform:translateY(-2px)}
.post-access-label{display:inline-block;margin-left:8px;padding:2px 6px;border:1px solid #d6aa5a;border-radius:3px;color:#8a5a0a;font-size:12px;font-weight:500;line-height:1.4;vertical-align:middle;white-space:nowrap}
.post-pinned-label{display:inline-block;margin-right:8px;padding:2px 6px;border:1px solid #b75d4a;border-radius:3px;color:#9b3f2f;font-size:12px;font-weight:600;line-height:1.4;vertical-align:middle;white-space:nowrap}
.article-login-gate{position:relative;display:flex;min-height:340px;align-items:center;justify-content:center;overflow:hidden;border:1px solid var(--line);border-radius:6px;padding:30px;background:repeating-linear-gradient(0deg,#f4f6f6 0,#f4f6f6 12px,#fff 12px,#fff 30px);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;text-align:center}.article-login-gate:before{position:absolute;inset:0;background:rgba(255,255,255,.72);backdrop-filter:blur(3px);content:""}.article-login-gate-inner{position:relative;z-index:1;width:100%;max-width:430px;border:1px solid #d5e3de;border-radius:6px;background:rgba(255,255,255,.96);padding:30px 24px;box-shadow:0 12px 35px rgba(32,37,43,.1)}.article-login-gate svg{fill:none;stroke:var(--accent);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.article-body .article-login-gate h2{margin:12px 0 8px;font-size:24px}.article-login-gate p{margin:0 0 20px;color:var(--muted);font-size:15px}.article-login-button{display:inline-block;border-radius:4px;background:var(--accent);padding:9px 24px;color:#fff;font-size:15px;font-weight:600}.article-login-button:hover,.article-login-button:focus{background:#0f594c;color:#fff;text-decoration:none}
@keyframes notice-pulse{0%{opacity:.78;transform:scale(.88)}72%,100%{opacity:0;transform:scale(1.52)}}
@keyframes notice-attention{0%,16%,100%{transform:rotate(0)}4%{transform:rotate(-16deg)}8%{transform:rotate(14deg)}12%{transform:rotate(-10deg)}}
.announcement-modal{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px;background:rgba(23,33,43,.48);opacity:0;transition:opacity .18s ease}.announcement-modal[hidden]{display:none}.announcement-modal.is-open{opacity:1}.announcement-dialog{width:100%;max-width:640px;max-height:calc(100vh - 40px);overflow:hidden;border-radius:6px;background:#fff;box-shadow:0 18px 60px rgba(23,33,43,.24);transform:translateY(10px) scale(.99);transition:transform .22s cubic-bezier(.4,0,.2,1)}.announcement-modal.is-open .announcement-dialog{transform:none}.announcement-header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 22px;border-bottom:1px solid var(--line)}.announcement-header h2{margin:0;font-size:22px}.announcement-close{flex:0 0 auto;border:0;border-radius:3px;background:transparent;padding:0 4px;color:var(--muted);font-size:30px;line-height:1}.announcement-close:hover,.announcement-close:focus{color:var(--ink)}.announcement-close:focus{outline:0;box-shadow:0 0 0 2px rgba(23,107,91,.28)}.announcement-content{max-height:calc(100vh - 120px);overflow:auto;padding:22px;font-family:"Songti SC",STSong,"SimSun",serif;font-size:16px;line-height:1.8}.announcement-content>:first-child{margin-top:0}.announcement-content>:last-child{margin-bottom:0}.announcement-content h1,.announcement-content h2,.announcement-content h3,.announcement-content h4,.announcement-content h5,.announcement-content h6{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}.announcement-content h1{font-size:27px}.announcement-content h2{font-size:23px}.announcement-content h3{font-size:20px}.announcement-content pre{overflow:auto;padding:16px;border-radius:4px;background:var(--code);color:#e7edf2}.announcement-content code{background:#f1f3f4;color:#8d3030}.announcement-content pre code{background:transparent;color:inherit}.announcement-content blockquote{padding:8px 16px;border-left:3px solid var(--accent);background:var(--soft);color:#48524d}.announcement-content img{max-width:100%;height:auto}.announcement-content table{min-width:520px;width:100%;border-collapse:collapse}.announcement-content th,.announcement-content td{padding:8px 10px;border:1px solid var(--line)}.announcement-content .table-scroll{overflow-x:auto}.announcement-open{overflow:hidden}
@media(max-width:768px){.site-nav .nav-notice-link{width:30px;height:30px;justify-content:center;margin:9px 8px;padding:0}.site-nav .nav-notice-link:after{animation-name:notice-pulse-mobile}.announcement-modal{padding:12px}.announcement-dialog{max-height:calc(100vh - 24px)}.announcement-header{padding:15px 17px}.announcement-header h2{font-size:20px}.announcement-content{max-height:calc(100vh - 94px);padding:17px;font-size:15px}}
@keyframes notice-pulse-mobile{0%{opacity:.72;transform:scale(.9)}72%,100%{opacity:0;transform:scale(1.32)}}
@media(prefers-reduced-motion:reduce){.nav-notice-link:after,.nav-notice-link svg{animation:none}.announcement-modal,.announcement-dialog{transition:none}}
.home-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:58px;align-items:start}.home-widgets{padding-top:54px}.widget{padding:0 0 30px;margin-bottom:30px;border-bottom:1px solid var(--line)}.widget h2{margin:0 0 16px;font-size:19px}.popular-list,.reply-list{margin:0;padding:0;list-style:none}.popular-list li{margin-bottom:13px}.popular-list a{display:block;color:var(--ink);line-height:1.5}.popular-list small{color:var(--muted)}.category-list{display:flex;flex-wrap:wrap;gap:8px 10px}.category-list a{display:inline-block;border:1px solid var(--line);border-radius:3px;padding:3px 9px;color:var(--ink);font-size:14px}.category-list a:hover,.category-list a:focus{border-color:#9eb8af;color:var(--accent);text-decoration:none}.tag-wall{display:flex;flex-wrap:wrap;gap:8px 13px;align-items:baseline}.tag-wall a{font-weight:600}.tag-color-1{color:#176b5b}.tag-color-2{color:#9a4a16}.tag-color-3{color:#6b4ca0}.tag-color-4{color:#17659a}.tag-color-5{color:#a03658}.tag-color-6{color:#52711d}.tag-color-7{color:#8a5b08}.tag-color-8{color:#455b74}.reply-list li{margin-bottom:15px;font-size:13px}.reply-list p{display:-webkit-box;overflow:hidden;margin:4px 0 0;color:var(--muted);-webkit-box-orient:vertical;-webkit-line-clamp:2}.widget-empty{color:var(--muted)}.site-stats{display:grid;grid-template-columns:1fr;gap:8px;margin:0}.site-stats div{display:flex;align-items:baseline;justify-content:space-between;padding:4px 0}.site-stats dt{color:var(--muted);font-size:13px;font-weight:400}.site-stats dd{margin:0;font-size:18px;font-weight:700}
.comments{margin-top:50px;padding-top:28px;border-top:1px solid var(--line);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}.comments>h2{margin-top:0;font-size:25px}.comments ol{padding:0;list-style:none}.comments li{padding:18px 0;border-bottom:1px solid var(--line)}.comments time{margin-left:12px;color:var(--muted);font-size:12px}.comments li p{margin:8px 0 0;white-space:normal}.comment-reply-target{margin-top:7px;color:var(--accent);font-size:13px}.comment-reply{margin-top:8px;border:0;background:transparent;padding:0;color:var(--accent)}.comment-form{margin-top:26px}.comment-form label{display:block;margin-bottom:7px;font-weight:700}.comment-form textarea{display:block;width:100%;border:1px solid #bcc6cc;border-radius:4px;padding:10px;resize:vertical}.comment-form>button[type=submit]{margin-top:10px;border:0;border-radius:4px;background:var(--accent);padding:9px 22px;color:#fff}.comment-replying{margin-bottom:10px;padding:8px 10px;background:var(--soft);font-size:13px}.comment-replying button{float:right;border:0;background:transparent;color:var(--accent)}.comment-limit{display:block;margin-top:5px;color:var(--muted)}.comment-login{padding:15px;background:var(--soft)}
@media(max-width:992px){.home-grid{grid-template-columns:1fr;gap:0}.home-widgets{display:grid;grid-template-columns:1fr 1fr;gap:28px;padding-top:15px}}
@media(max-width:768px){.header-search{width:100%;margin-bottom:8px}.home-widgets{grid-template-columns:1fr}.footer-inner{gap:12px 18px}}
.article-body .table-scroll{width:100%;max-width:100%;overflow-x:auto}
.article-body .table-scroll table{display:table;width:100%;min-width:100%;max-width:none;white-space:normal}
.article-body .table-align-left{text-align:left}
.article-body .table-align-center{text-align:center}
.article-body .table-align-right{text-align:right}
.article-body ul,.article-body ol{padding-left:1.65em}
.article-body li>ul,.article-body li>ol{margin-top:.35em;margin-bottom:0}
.article-body li>pre{margin:1em 0}
.article-body pre{tab-size:4;-moz-tab-size:4}