.article-main{padding-top:124px;max-width:1120px}.article-back{display:inline-flex;align-items:center;gap:10px;font-size:12px;color:var(--text-muted);margin-bottom:48px}.article-back:hover{color:var(--text)}.article-header{max-width:850px;margin:0 auto 52px}.article-category{font-size:12px;color:var(--text-muted);margin-bottom:22px}.article-header h1{font-size:clamp(34px,4.4vw,56px);line-height:1.2;letter-spacing:-1.5px;max-width:820px}.article-summary{font-size:18px;color:var(--text-secondary);line-height:1.8;margin-top:26px;max-width:720px}.article-byline{display:flex;justify-content:space-between;gap:20px;margin-top:34px;padding:22px 0;border:0;font-size:12px;color:var(--text-muted)}.article-byline a:hover{color:var(--text)}.article-layout{display:grid;grid-template-columns:190px minmax(0,720px);gap:55px;justify-content:center}.article-toc nav{position:sticky;top:110px;padding-top:8px}.article-toc p{font-size:11px;color:var(--text-muted);margin-bottom:18px}.article-toc a{display:block;border-left:1px solid var(--line-subtle);padding:9px 0 9px 16px;font-size:12px;line-height:1.6;color:var(--text-muted);transition:color .2s,border-color .2s}.article-toc a:hover,.article-toc a[aria-current=location]{color:var(--text);border-left-color:var(--text)}.article-body{min-width:0;font-size:16px;line-height:1.95;color:var(--text-secondary)}.article-notice{font-size:12px;line-height:1.8;border-left:2px solid var(--line);padding:12px 18px;background:var(--surface-section);margin-bottom:30px}.article-body .article-lead{font-size:19px;color:var(--text);line-height:1.85;margin-bottom:44px}.article-body section{scroll-margin-top:105px;margin-bottom:46px}.article-body h2{font-size:26px;line-height:1.5;letter-spacing:-.5px;color:var(--text);margin-bottom:20px}.article-body p+p{margin-top:22px}.article-body blockquote{margin:34px 0;padding:8px 0 8px 24px;border-left:2px solid var(--text-muted);font-size:21px;line-height:1.8;color:var(--text)}.article-body ul{padding-left:24px;margin-top:20px}.article-body li{padding-left:5px;margin:10px 0}.article-body figure{margin:34px 0}.article-memory-figure{display:flex;align-items:center;justify-content:center;gap:20px;padding:54px 24px;background:var(--surface-section);border:1px solid var(--line-subtle);border-radius:6px;font:14px var(--font-body);color:var(--text)}.article-memory-figure span{padding:20px 16px;border:1px solid var(--line);border-radius:5px}.article-memory-figure b{font-weight:400;color:var(--text-muted)}.article-body figcaption{font-size:11px;color:var(--text-muted);margin-top:14px;text-align:center}.article-end{border-top:1px solid var(--line-subtle);padding:36px 0 16px;margin-top:56px}.article-end h2{font-size:22px}.article-main+.site-footer{margin-top:90px}html[lang=zh-CN] .article-header h1{letter-spacing:0;line-height:1.4}
@media(max-width:900px){.article-layout{grid-template-columns:150px minmax(0,1fr);gap:30px}.article-header{margin-bottom:35px}.article-memory-figure{gap:10px;padding:35px 15px}.article-memory-figure span{padding:15px 10px}}
@media(max-width:650px){.article-main{width:calc(100% - 40px);padding-top:100px}.article-back{margin-bottom:30px}.article-header h1{font-size:36px}.article-summary{font-size:16px}.article-layout{grid-template-columns:1fr;gap:30px}.article-toc nav{position:static;padding:0}.article-toc nav a{display:inline-block;border-left:0;border-bottom:1px solid var(--line-subtle);padding:8px 0;margin-right:20px}.article-body{font-size:15px}.article-body .article-lead{font-size:17px}.article-body h2{font-size:23px}.article-body blockquote{font-size:18px}.article-memory-figure{gap:8px;font-size:11px}.article-memory-figure span{padding:15px 8px}.article-byline{flex-wrap:wrap}}
/* Source article: metadata, retrieval example, metrics and author. */
.article-date{display:block;color:var(--text-muted);font-size:12px;margin-bottom:20px}.article-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}.article-tags>span{font-size:11px;padding:4px 9px;border:1px solid var(--line-subtle);border-radius:5px;color:var(--text-secondary);background:var(--surface-section)}.article-byline{align-items:center}.article-author{display:flex;align-items:center;flex-wrap:wrap;gap:12px;color:var(--text)}.article-avatar{display:grid;place-items:center;width:32px;height:32px;background:var(--surface-section);border-radius:50%;font-weight:600}.article-read-time{color:var(--text-muted);margin-left:8px}.article-byline .button-secondary{font-size:12px}.article-arrow-back{transform:rotate(180deg)}.article-layout{grid-template-columns:minmax(0,720px) 190px}.article-toc{grid-column:2;grid-row:1}.article-body{grid-column:1;grid-row:1}.article-code{position:relative;border:1px solid var(--line-subtle);border-radius:7px;background:var(--surface-section);overflow:hidden}.article-code>button{position:absolute;top:10px;right:10px;min-height:30px;padding:5px 9px;font-size:11px;z-index:1}.article-code pre{margin:0;padding:55px 22px 24px;overflow-x:auto;font:12px/1.9 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--text)}.code-keyword{color:#ef8c9a}.code-variable{color:#86b9f4}.code-function{color:#bd9be9}.code-number{color:#83c5b0}.article-table-wrap{overflow-x:auto;border:1px solid var(--line-subtle);border-radius:6px;margin:22px 0}.article-body table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.article-body th{color:var(--text);font-weight:500;background:var(--surface-section)}.article-body th,.article-body td{padding:13px 16px;border-bottom:1px solid var(--line-subtle)}.article-body tr:last-child td{border-bottom:0}.article-author-bio{border-top:1px solid var(--line-subtle);padding-top:24px;margin-top:30px;font-size:13px}.article-author-bio h3{font-weight:600;font-size:13px;margin-bottom:8px}.article-author-bio p{font-size:13px}.article-end{margin-top:65px;padding:36px 0}.article-end .button-secondary{display:inline-flex;gap:10px}html[data-theme=light] .code-keyword{color:#b9284a}html[data-theme=light] .code-variable{color:#2364a7}html[data-theme=light] .code-function{color:#7841b1}html[data-theme=light] .code-number{color:#187567}
@media(max-width:900px){.article-layout{grid-template-columns:minmax(0,1fr) 150px}}
@media(max-width:650px){.article-layout{grid-template-columns:1fr}.article-toc{grid-column:1;grid-row:1}.article-body{grid-column:1;grid-row:2}.article-code pre{font-size:11px;padding-inline:16px}.article-byline{gap:16px}.article-author{gap:8px}.article-read-time{margin-left:0}.article-header h1{font-size:32px}}
/* Symmetric code spacing with a hover-only Lucide copy control. */
.article-code{--code-padding-block:12px;--code-font-size:12px;overflow:visible;border-radius:var(--control-radius,12px)}
.article-code pre{padding:var(--code-padding-block) 58px var(--code-padding-block) 22px;border-radius:inherit}
.article-code>.article-copy-icon{position:absolute;top:calc(var(--code-padding-block) + var(--code-font-size) * .95 - 15px);right:10px;width:30px;height:30px;min-height:0;padding:0;display:grid;place-items:center;border:0;border-radius:5px;background:var(--surface-section);color:var(--text-muted);opacity:0;pointer-events:none;transition:opacity .16s,color .16s,background .16s;z-index:2}
.article-code:hover>.article-copy-icon,.article-code:focus-within>.article-copy-icon{opacity:1;pointer-events:auto}
.article-copy-icon:hover{color:var(--text);background:var(--surface-card)}
.article-copy-icon .copy-success{display:none;color:#35b879}
.article-copy-icon.is-copied .copy-default{display:none}
.article-copy-icon.is-copied .copy-success{display:block}
.copy-tooltip{position:absolute;bottom:calc(100% + 9px);left:50%;right:auto;transform:translateX(-50%);width:max-content;max-width:230px;padding:6px 10px;border:1px solid var(--line-subtle);border-radius:5px;background:var(--surface-menu);color:var(--text);font:11px/1.5 var(--font-body);box-shadow:0 4px 16px #0002;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .12s,visibility .12s}
.article-copy-icon:hover .copy-tooltip,.article-copy-icon:focus-visible .copy-tooltip{opacity:1;visibility:visible}
@media(max-width:650px){.article-code{--code-padding-block:10px;--code-font-size:11px}.article-code pre{padding:var(--code-padding-block) 52px var(--code-padding-block) 16px}}
@media(hover:none){.article-code>.article-copy-icon{opacity:1;pointer-events:auto}}
@media(prefers-reduced-motion:reduce){.article-copy-icon,.copy-tooltip{transition:none!important}}
/* Article Markdown surface: white prose with clearly separated code and tables. */
.article-main{--article-panel:#242424;--article-panel-head:#303030;--article-panel-line:#565656;--article-link:#a9ccff}
html[data-theme=light] .article-main{--article-panel:#edf0f5;--article-panel-head:#e0e5ed;--article-panel-line:#b8c1ce;--article-link:#215caa}
.article-body,.article-summary,.article-body figcaption{color:var(--text)}
.article-code,.article-table-wrap{background:var(--article-panel);border-color:var(--article-panel-line)}
.article-code>.article-copy-icon{background:var(--article-panel);color:var(--text)}
.article-code>.article-copy-icon:hover{background:var(--article-panel-head)}
.article-body th{background:var(--article-panel-head);font-weight:600}
.article-body th,.article-body td{border-color:var(--article-panel-line)}
.article-body tbody tr:nth-child(even){background:color-mix(in srgb,var(--article-panel-head) 40%,transparent)}
.article-body a:not(.button-secondary){color:var(--article-link);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px;overflow-wrap:anywhere}
.article-body a:not(.button-secondary):hover{text-decoration-thickness:2px}
.article-body :is(h3,h4,h5,h6){color:var(--text);font-weight:600;line-height:1.5;margin:28px 0 14px}
.article-body h3{font-size:22px}.article-body h4{font-size:19px}.article-body h5{font-size:17px}.article-body h6{font-size:15px}
.article-body strong{font-weight:700}.article-body em{font-style:italic}.article-body del{text-decoration-thickness:1px}
.article-body mark{background:#e8c76c;color:#1b170c;padding:2px 4px;border-radius:3px}
.article-body :not(pre)>code{font: .88em/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;background:var(--article-panel);border:1px solid var(--article-panel-line);padding:2px 6px;border-radius:4px;overflow-wrap:anywhere}
.article-body kbd{display:inline-block;font: .8em/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;border:1px solid var(--article-panel-line);border-bottom-width:3px;border-radius:4px;padding:2px 7px;background:var(--article-panel)}
.article-body :is(ul,ol){padding-left:26px;margin:20px 0}.article-body li>ul,.article-body li>ol{margin:8px 0}.article-body li::marker{color:var(--text)}
.article-body .task-list{list-style:none;padding-left:0}.task-list label{display:flex;align-items:center;gap:10px}.task-list input{width:15px;height:15px;margin:0;accent-color:#79b99c;flex:none;opacity:1}
.article-body blockquote{border-left:3px solid var(--article-accent);background:var(--article-panel);padding:20px 24px;font-size:17px;border-radius:0 6px 6px 0;color:var(--text)}
.article-body blockquote blockquote{margin:20px 0 0;background:var(--article-panel-head);font-size:15px}
.article-body hr{border:0;border-top:1px solid var(--article-panel-line);margin:36px 0}
.article-body img{display:block;max-width:100%;height:auto;border-radius:8px;border:1px solid var(--article-panel-line)}
.article-body sup,.article-body sub{font-size:.75em;line-height:0}
.article-body details{margin:24px 0;border:1px solid var(--article-panel-line);border-radius:var(--panel-radius,22px);padding:16px 20px;background:var(--article-panel)}
.article-body summary{cursor:pointer;font-weight:500}.article-body details[open]>summary{margin-bottom:14px}
.article-footnotes{margin-top:32px;padding-top:10px;border-top:1px solid var(--article-panel-line);font-size:13px}
.article-footnotes li{scroll-margin-top:100px}#fn-ref-1{scroll-margin-top:100px}
.article-toc nav{max-height:calc(100vh - 140px);overflow-y:auto}
.article-author-bio h3{font-size:13px;margin:0 0 8px}
@media(max-width:650px){.article-body h3{font-size:20px}.article-body blockquote{padding:16px 18px}.article-toc nav{max-height:none;overflow:visible}}
/* Center the reading column itself; the TOC occupies the right margin. */
.article-header,.article-layout,.article-main>.article-end{width:100%;max-width:720px;margin-left:auto;margin-right:auto}
.article-layout{position:relative;display:block}
.article-body{width:100%;min-width:0}
.article-toc{position:absolute;top:0;bottom:0;left:calc(100% + 40px);width:180px}
.article-toc nav{position:sticky;top:110px}
.article-back{display:flex;width:100%;max-width:720px;margin-left:auto;margin-right:auto}
@media(max-width:1239px){
 .article-toc{position:static;width:100%;margin-bottom:32px}
 .article-toc nav{position:static;max-height:none;overflow:visible;padding:0}
 .article-toc nav a{display:inline-block;border-left:0;border-bottom:1px solid var(--line-subtle);padding:8px 0;margin-right:20px}
}
/* Wide editorial header and cover; the reading column stays independently centered. */
.article-header{max-width:1040px;margin-bottom:28px}
.article-header h1{max-width:1040px}
.article-header .article-summary{max-width:920px}
.article-back{max-width:1040px}
.article-cover{width:100%;max-width:1040px;aspect-ratio:12/5;margin:0 auto 48px;overflow:hidden;border-radius:12px}
.article-cover img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
@media(max-width:650px){.article-cover{aspect-ratio:16/9;border-radius:10px;margin-bottom:36px}}
/* Editorial cover backdrop: central 70% of the 16:10 source frame → 16:7. */
.article-main{position:relative;isolation:isolate}
.article-cover{position:absolute;top:0;left:50%;transform:translateX(-50%);width:100vw;max-width:none;aspect-ratio:16/6;margin:0;border-radius:0;overflow:hidden;z-index:-1;pointer-events:none;background:#111}
.article-cover img{position:absolute;left:0;top:-33.333333%;width:100%;height:166.666667%;object-fit:contain;object-position:center}
.article-cover:after{content:'';position:absolute;inset:0;background:linear-gradient(to bottom,rgba(0,0,0,.52) 0%,rgba(0,0,0,.58) 35%,color-mix(in srgb,var(--bg) 80%,transparent) 72%,var(--bg) 100%)}
.article-header{margin-bottom:48px}
.article-tags{gap:8px;align-items:center}
.article-tags>span{padding:6px 15px;border:0;border-radius:999px;background:rgba(35,35,38,.72);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);color:#fff;font-size:12px;font-weight:400;line-height:1.5}
html[data-theme=light] .article-cover:after{background:linear-gradient(to bottom,rgba(255,255,255,.6),color-mix(in srgb,var(--bg) 82%,transparent) 65%,var(--bg))}
html[data-theme=light] .article-tags>span{background:rgba(175,183,196,.42);color:#303640;backdrop-filter:blur(24px) saturate(120%);-webkit-backdrop-filter:blur(24px) saturate(120%)}
@media(max-width:650px){.article-cover{aspect-ratio:16/6;margin:0;border-radius:0}.article-header{margin-bottom:36px}.article-tags>span{padding:5px 12px}}
/* Related posts reuse the homepage grid, card typography and border lighting. */
.article-related{width:100%;margin:72px auto 0;padding-top:36px;border-top:1px solid var(--line-subtle)}
.article-related>h2{font-size:26px;line-height:1.4;letter-spacing:-.5px;margin-bottom:26px}
@media(max-width:650px){.article-related{margin-top:48px;padding-top:28px}.article-related>h2{font-size:24px}}

/* Match the homepage's seamless initial header and gradient navigation guard. */
.article-cover:before{content:'';position:absolute;inset:0 0 auto;height:calc(var(--site-header-height) + var(--hero-nav-guard-depth));z-index:1;pointer-events:none;background:linear-gradient(to bottom,color-mix(in srgb,var(--bg) 95%,transparent) 0%,color-mix(in srgb,var(--bg) 78%,transparent) 30%,color-mix(in srgb,var(--bg) 44%,transparent) 58%,color-mix(in srgb,var(--bg) 12%,transparent) 82%,transparent 100%)}

/* Clearer copy-link control over the cover backdrop. */
.article-byline [data-copy="link"]{border:1px solid rgba(255,255,255,.38);background:rgba(52,52,56,.82);color:var(--text);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.article-byline [data-copy="link"]:hover{border-color:rgba(255,255,255,.62);background:rgba(70,70,75,.94)}
html[data-theme=light] .article-byline [data-copy="link"]{border-color:rgba(0,0,0,.28);background:rgba(235,238,243,.88)}
html[data-theme=light] .article-byline [data-copy="link"]:hover{border-color:rgba(0,0,0,.45);background:rgba(220,225,234,.96)}
/* Borderless inline images with continuous modal zoom. */
.article-body img{border:0;cursor:zoom-in}
.article-body img:focus-visible{outline:2px solid var(--text);outline-offset:5px}
.article-image-viewer{position:fixed;inset:0;width:100%;height:100%;max-width:none;max-height:none;margin:0;padding:0;border:0;background:transparent;overflow:hidden;cursor:default;outline:none}
.article-image-viewer::backdrop{background:transparent}
.image-viewer-shade{position:absolute;inset:0;background:rgba(0,0,0,.88)}
.image-viewer-image{position:absolute;display:block;max-width:none;border:0;border-radius:8px;object-fit:contain;transform-origin:top left;cursor:zoom-out;will-change:transform}
/* Center prose + contents as one group on the header's axis. */
.article-byline{border:0}
html[data-theme=dark] .article-tags>span{background:rgba(82,82,87,.78)}
.article-layout{display:grid;grid-template-columns:minmax(0,720px) 180px;gap:40px;width:100%;max-width:940px;margin-inline:auto;align-items:start}
.article-layout>.article-body{grid-column:1;grid-row:1;min-width:0}
.article-layout>.article-toc{position:sticky;top:110px;bottom:auto;left:auto;grid-column:2;grid-row:1;width:auto;margin:0;align-self:start}
.article-layout>.article-toc nav{position:static;max-height:calc(100vh - 140px);overflow-y:auto}
.article-layout>.article-toc nav a{display:block;border-bottom:0;border-left:1px solid var(--line-subtle);padding:9px 0 9px 16px;margin-right:0}
.article-layout>.article-toc nav a[aria-current=location]{border-left-color:var(--text)}
@media(max-width:1000px){
 .article-layout{display:block;max-width:720px}
 .article-layout>.article-toc{position:static;margin-bottom:32px}
 .article-layout>.article-toc nav{max-height:none;overflow:visible}
 .article-layout>.article-toc nav a{display:inline-block;border-left:0;border-bottom:1px solid var(--line-subtle);padding:8px 0;margin-right:20px}
}

/* Compact author/action group; date and avatar remain clear over the cover. */
.article-date{font-size:15px;line-height:1.6;color:var(--text-secondary)}
.article-avatar{border:1px solid rgba(255,255,255,.6)}
html[data-theme=light] .article-avatar{border-color:rgba(25,25,28,.6)}
.article-byline{justify-content:flex-start;flex-wrap:wrap;gap:16px 24px}
.article-byline [data-copy="link"]{flex:none}
@media(max-width:650px){.article-byline{gap:14px 18px}}

/* One accent for quote rules and read-only Markdown checkboxes. */
.article-main{--article-accent:#b8c7dc}
.task-list input[type="checkbox"]{appearance:none;-webkit-appearance:none;display:inline-grid;place-items:center;border:1px solid var(--article-accent);border-radius:3px;background:transparent;accent-color:var(--article-accent);opacity:1}
.task-list input[type="checkbox"]:checked{background:color-mix(in srgb,var(--article-accent) 40%,transparent);border-color:var(--article-accent)}
.task-list input[type="checkbox"]:checked:before{content:'';width:12px;height:12px;background:var(--article-accent);mask:url('../icons/lucide/check.svg') center/contain no-repeat;-webkit-mask:url('../icons/lucide/check.svg') center/contain no-repeat}

/* Copy-link icon shares the existing success/reset state controller. */
.article-byline [data-copy="link"]{border-color:rgba(255,255,255,.2);gap:8px}
.article-byline [data-copy="link"]:hover{border-color:rgba(255,255,255,.34)}
html[data-theme=light] .article-byline [data-copy="link"]{border-color:rgba(0,0,0,.16)}
html[data-theme=light] .article-byline [data-copy="link"]:hover{border-color:rgba(0,0,0,.28)}
.article-byline [data-copy="link"] .icon{width:15px;height:15px}
.article-byline [data-copy="link"] .link-copy-success{display:none;color:#35b879}
.article-byline [data-copy="link"].is-copied .link-copy-default{display:none}
.article-byline [data-copy="link"].is-copied .link-copy-success{display:block}

/* Position the article flow for the 16:6 cover. */
.article-main{padding-top:calc(124px + 6.25vw)}
@media(max-width:650px){.article-main{padding-top:calc(100px + 6.25vw)}}

/* Return link above the title; date and sharing action grouped at the right. */
.article-header{position:relative;padding-top:0}
.article-back-button{position:absolute;bottom:calc(100% + 24px);left:0;gap:8px;padding:0;min-height:32px;color:var(--text-secondary)}
html .article-back-button,html .article-back-button:hover{background:none;border:0;box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}
.article-back-button:hover{color:var(--text)}
.article-byline-actions{display:flex;align-items:center;justify-content:flex-end;gap:20px;margin-left:auto;flex-wrap:wrap}
.article-byline-actions .article-date{margin:0;white-space:nowrap}
@media(max-width:650px){.article-byline-actions{gap:14px}.article-byline-actions .article-date{font-size:13px}}

/* Balanced author identity and consistent reading/date metadata. */
.article-byline-details{display:flex;align-items:center;flex-wrap:wrap;gap:16px 24px;min-width:0}
.article-byline .article-author{gap:10px;font-size:13px;line-height:1.6}
.article-byline .article-avatar{width:30px;height:30px;flex:none;font-size:12px}
.article-meta-item{display:inline-flex;align-items:center;gap:7px;color:var(--text-secondary);white-space:nowrap}
.article-meta-item .icon{width:15px;height:15px;flex:none;stroke-width:1.75}
.article-byline .article-meta-item :is(.article-date,.article-read-time){font-size:13px;line-height:1.6;color:inherit;margin:0}
.article-byline-actions{flex:none}
@media(max-width:650px){.article-byline-details{gap:12px 18px}.article-byline .article-author{width:100%}}

/* Detail covers show the upper 75% of a 16:10 source; list covers remain unchanged. */
.article-main{padding-top:164px}
.article-header{margin-bottom:32px}
.article-cover{position:relative;inset:auto;transform:none;width:100%;max-width:1040px;aspect-ratio:16/7.5;height:auto;margin:0 auto 48px;border-radius:12px;overflow:hidden;z-index:auto;pointer-events:auto;background:transparent}
.article-cover::before,.article-cover::after{content:none;display:none}
.article-cover img{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover;object-position:center top;border:0;cursor:zoom-in}
@media(max-width:650px){.article-main{padding-top:140px}.article-header{margin-bottom:24px}.article-cover{margin-bottom:32px;border-radius:10px}}

/* Glow appearance is shared with the homepage in blog.css. */
.article-cover{overflow:visible;isolation:isolate}
.article-cover img{border-radius:inherit}

@supports(corner-shape:superellipse(1.3)){.article-code,.article-code pre{corner-shape:superellipse(1.3)}}

/* Tables follow the shared panel radius and continuous-corner treatment. */
.article-table-wrap{border-radius:var(--panel-radius,22px);overflow-x:auto;overflow-y:hidden}
@supports(corner-shape:superellipse(1.3)){.article-table-wrap,.article-body details{corner-shape:superellipse(1.3)}}