:root{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft Yahei",sans-serif;color:var(--text,#182236);background:var(--page,#f6f8fc);font-synthesis:none;line-height:1.7;--blue:#2469ed;--line:#e3e9f2}*{box-sizing:border-box}body{margin:0}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,input{font:inherit}button,a,input{outline-offset:4px}button{cursor:pointer}img,video{max-width:100%;height:auto}figure{margin:0}h1,h2,h3{line-height:1.35;letter-spacing:-.025em}h1{font-size:clamp(30px,4vw,46px);margin:0 0 20px}h2{font-size:24px}h3{font-size:19px}[hidden]{display:none!important}.shell{max-width:1248px;padding:0 24px;margin:auto}.collection-header{padding:68px 0 30px;text-align:center}.collection-header p:not(.eyebrow){font-size:17px;color:#6a778b;max-width:640px;margin:0 auto}.eyebrow{font-size:13px;letter-spacing:.14em;color:var(--blue);margin:0 0 16px}.type-tabs{display:flex;justify-content:center;gap:12px;margin:20px 0 36px}.type-tabs a,.topics a{padding:9px 20px;border-radius:24px;color:#536079;background:var(--surface,#fff);border:1px solid var(--line)}.type-tabs a[aria-current],.topics a[aria-current]{background:var(--blue);color:white;border-color:var(--blue)}.search-form{display:flex;max-width:620px;margin:0 auto 28px;gap:8px;align-items:center}.search-form label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.search-form input{min-width:0;flex:1;border:1px solid #d9e2ef;border-radius:10px;padding:12px 16px;background:white}.search-form button,.search-results button{border:1px solid #d9e2ef;background:var(--surface,#fff);color:var(--blue);padding:10px 16px;border-radius:10px}.topics{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:28px}.topics a{font-size:14px;padding:6px 15px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.card{border-radius:16px;overflow:hidden;background:var(--surface,#fff);border:1px solid #e9eef5;transition:transform .15s,box-shadow .15s}.card:hover{transform:translateY(-3px);box-shadow:0 12px 30px #253c5b0d}.card>a{display:block;height:100%;color:inherit;text-decoration:none}.card-media{position:relative;aspect-ratio:4/3;background:#e9eef7;overflow:hidden}.card-media img{width:100%;height:100%;object-fit:cover;display:block}.card-content{padding:20px 22px 24px}.topic-label{color:var(--blue);font-size:12px;font-weight:600}.card h2{font-size:19px;margin:8px 0 10px;overflow-wrap:anywhere}.card p{color:#738097;font-size:14px;margin:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden}.play{position:absolute;inset:0;display:grid;place-content:center;color:white;font-size:26px;text-shadow:0 2px 10px #000;pointer-events:none}.duration{position:absolute;bottom:12px;right:12px;background:#14202ad9;color:white;border-radius:5px;padding:1px 7px;font-size:12px;font-variant-numeric:tabular-nums}.pagination{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:36px 0}.pagination a{background:var(--surface,#fff);border:1px solid var(--line);padding:7px 15px;border-radius:8px}.pagination a[aria-current]{background:var(--blue);color:white}.empty{padding:60px 20px;text-align:center;color:#7b8798;grid-column:1/-1}.search-status{font-size:14px;color:#7b8798}.search-results>.pagination{align-items:center}.search-results button:disabled{opacity:.45;cursor:default}.breadcrumbs{display:flex;flex-wrap:wrap;gap:10px;font-size:13px;margin:28px 0;color:#8190a4}.article-header{max-width:950px;padding:22px 0 32px}.summary{font-size:18px;line-height:1.85;color:#617188}.meta{display:flex;gap:22px;flex-wrap:wrap;color:#8590a2;font-size:13px}.environment{font-size:13px;color:#66748a}.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:40px;align-items:start}.article-body{min-width:0;background:var(--surface,#fff);border:1px solid var(--line);border-radius:16px;padding:32px}.content-block{scroll-margin-top:28px;margin-bottom:36px;overflow-wrap:anywhere}.content-block:last-child{margin-bottom:0}.content-block>h2,.content-block>h3{margin:0 0 22px}.content-block p{margin:0 0 16px}.content-block pre{white-space:pre-wrap;background:#f3f6fa;padding:16px;border-radius:8px}.content-block blockquote{border-left:3px solid #bcd3ff;margin:16px 0;padding-left:18px;color:#66748a}.image-link{display:block}.image-link img{display:block;margin:auto;border-radius:8px;object-fit:contain}.content-block figcaption{font-size:13px;color:#77849a;text-align:center;margin:10px 0 0}.steps{list-style:none;margin:0;padding:0}.steps>li{position:relative;padding:0 0 24px 34px;border-left:2px solid #e5edfc;margin-left:15px}.step-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:24px;padding:22px;border:1px solid #e3edff;border-radius:12px;background:var(--surface,#fff);box-shadow:0 4px 18px #2469ed08}.step-card.text-only{grid-template-columns:minmax(0,1fr)}.steps>li:last-child{border-color:transparent;padding-bottom:0}.step-text{min-width:0}.steps>li>.step-number{position:absolute;left:-16px;top:20px;background:var(--blue);color:#fff}.step-number{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#eaf1ff;color:var(--blue);font-size:14px;font-weight:700;margin-right:10px}.steps h3{margin:0 0 16px}.split-guide{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:26px;align-items:start}.split-guide>ol{padding:0;margin:0;list-style:none}.split-guide li+li{margin-top:26px}.split-guide h3{display:flex;align-items:center;margin:0 0 12px}.split-guide .step-number{flex-shrink:0}.notice{padding:18px 22px;border-radius:10px;background:#edf4ff;border-left:3px solid var(--blue)}.notice-warning{background:#fff7e8;border-color:#dfa13a}.notice p:last-child{margin-bottom:0}.faq{margin:0}.faq dt{font-weight:650;margin:18px 0 8px}.faq dd{margin:0;color:#5d6b80}.toc{position:sticky;top:28px;font-size:14px;max-height:calc(100vh - 56px);overflow:auto;background:var(--surface,#fff);border:1px solid var(--line);border-radius:16px;padding:20px;scrollbar-width:thin}.toc h2{font-size:14px;margin:0 0 14px}.toc ul{list-style:none;padding:0;margin:0;border-left:1px solid var(--line)}.toc li{padding:6px 0 6px 16px}.toc li.level-3{padding-left:30px}.toc a{display:block;color:#6b7b91;overflow-wrap:anywhere;line-height:1.6;border-radius:6px;padding:4px 6px}.toc a:hover,.toc a:focus-visible{color:var(--blue);background:var(--page,#f6f8fc);text-decoration:none}.comparison{max-width:640px;margin-inline:auto}.comparison.is-ready{max-width:min(640px,calc(min(560px,60vh) * var(--comparison-ratio,1)))}.comparison-images{display:grid;grid-template-columns:1fr 1fr;gap:12px}.comparison-control{display:block;margin-top:12px}.comparison-control input{width:100%;accent-color:var(--blue);touch-action:pan-y}.comparison.is-ready .comparison-images{display:block;position:relative;overflow:hidden;border-radius:10px;touch-action:pan-y}.comparison.is-ready .compare-after{position:absolute;inset:0;clip-path:inset(0 0 0 var(--position,50%));pointer-events:none}.comparison.is-ready .compare-before img,.comparison.is-ready .compare-after img{width:100%;height:auto;border-radius:0}.comparison.is-ready .comparison-images figcaption{position:absolute;bottom:12px;background:#172a3ad9;color:#fff;padding:3px 10px;margin:0;border-radius:5px}.comparison.is-ready .compare-before figcaption{left:12px}.comparison.is-ready .compare-after figcaption{right:12px}.comparison.is-ready .comparison-images:after{content:"";position:absolute;top:0;bottom:0;left:var(--position,50%);width:2px;background:var(--surface,#fff);box-shadow:0 0 6px #0005;pointer-events:none}.comparison-status:empty{display:none}.video-player{display:block;width:100%;max-height:72vh;background:#111c2c;border-radius:16px;margin-bottom:32px;object-fit:contain}.transcript{margin-top:32px;white-space:normal}.related{margin:50px 0}.back-link{display:inline-block;margin:32px 0}.site-footer{text-align:center;padding:48px 24px;margin-top:48px;color:#8793a4;font-size:13px;border-top:1px solid var(--line)}.preview-banner{text-align:center;background:#fff3d9;color:#886211;padding:8px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1000px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.reading-layout{grid-template-columns:minmax(0,1fr)}.toc{position:static;grid-row:1;max-height:none;padding:18px 20px}.toc ul{display:flex;flex-wrap:wrap;gap:8px;border:0}.toc li,.toc li.level-3{padding:0 12px 0 0}.reading-layout{gap:22px}.collection-header{padding-top:48px}}
@media(max-width:600px){.shell{padding:0 16px}.collection-header{padding:40px 0 18px}.collection-header p:not(.eyebrow){font-size:15px}.type-tabs{gap:8px;margin-bottom:26px}.type-tabs a{padding:8px 16px;font-size:14px}.cards{grid-template-columns:minmax(0,1fr);gap:20px}.topics{gap:7px}.topics a{font-size:13px;padding:5px 12px}.article-body{padding:22px 18px}.step-card,.split-guide{grid-template-columns:minmax(0,1fr)}.step-card{gap:16px;padding:16px}.steps>li{gap:12px;padding-left:29px;margin-left:10px}.split-guide{gap:22px}.comparison-images{grid-template-columns:minmax(0,1fr)}.article-header{padding-top:10px}.summary{font-size:16px}.search-form button{padding:10px}.card-content{padding:18px 20px}.site-footer{margin-top:24px}}
@media(prefers-reduced-motion:reduce){.card{transition:none}.card:hover{transform:none}}

.plain-text{white-space:pre-wrap}

/* Header mirrors the website Layout: 1000px content width, 64px navigation. */
.site-header{background:#000;border-bottom:1px solid #ffffff1a;color:#fff}
.nav-shell{max-width:1000px;height:63px;min-height:0;padding:0 20px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:10px}
.brand{font-size:20px;font-weight:700;color:#fff;display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.brand img{display:block;height:40px;max-width:200px;width:auto;object-fit:contain}
.header-right{display:flex;align-items:center;gap:10px;min-width:0}
.nav-links{display:flex;align-items:stretch;gap:0;margin-right:20px;height:64px;font-size:14px;line-height:normal}
.nav-links>a,.help-home-link{display:flex;align-items:center;padding:0 20px;border-bottom:2px solid transparent;color:#fff;white-space:nowrap;text-decoration:none}
.nav-links>a:hover,.help-home-link:hover{color:#00e0ff;text-decoration:none}
.help-nav{position:relative;display:flex;align-items:stretch;padding:0;gap:0}
.help-home-link.selected{color:#00e0ff;border-image:linear-gradient(to right,#00e0ff,#547aff) 1;border-bottom-width:2px;border-bottom-style:solid}
.help-menu{display:none;position:absolute;top:100%;right:0;z-index:10;min-width:150px;padding:6px;background:#fff;border:1px solid #e4e7ed;border-radius:8px;box-shadow:0 8px 24px #0002}
.help-menu a{display:block;padding:12px;color:#303133;text-decoration:none;white-space:nowrap;line-height:1.4;font-size:14px;border-radius:4px}
.help-menu a:hover,.help-menu a:focus-visible{color:#409eff;background:#ecf5ff}
.help-nav:hover .help-menu,.help-nav:focus-within .help-menu,.help-nav.is-open .help-menu{display:block}
.help-nav.is-closed .help-menu{display:none}
.header-actions{display:flex;align-items:center;gap:10px}
.theme-toggle{display:flex;align-items:center;justify-content:center;padding:0;border:0;background:transparent;color:#fff}
.theme-toggle svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.5}
.sun-icon{display:none}
.account-link{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:#ffffff1a;border:1px solid #fff3;color:#fff}
.account-link svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.5}
.theme-light .site-header{background:#001e36;border-bottom-color:#001e36}
.theme-light .nav-links>a,.theme-light .help-home-link{color:#ffffffcc}
.theme-light .help-home-link.selected{color:#fff;border-image:none;border-bottom-color:#ffffffe6}
.theme-light .nav-links>a:hover,.theme-light .help-home-link:hover{color:#fff}
.theme-light .moon-icon{display:none}.theme-light .sun-icon{display:block}
.theme-dark{--page:#080a1b;--surface:#161a2b;--text:#edf0f7;--line:#2c3144;--blue:#6aa7ff;color-scheme:dark}
.theme-dark .collection-header p:not(.eyebrow),.theme-dark .card p,.theme-dark .summary,.theme-dark .faq dd,.theme-dark .toc a{color:#aeb9ce}
.theme-dark .type-tabs a:not([aria-current]),.theme-dark .topics a:not([aria-current]){color:#c3cde0}
.theme-dark .card,.theme-dark .step-card,.theme-dark .search-form input,.theme-dark .search-form button,.theme-dark .search-results button{border-color:var(--line)}
.theme-dark .notice,.theme-dark .content-block pre{background:#1c263b}
.theme-dark .notice-warning{background:#372d1c}
@media(max-width:768px){
 .nav-shell{position:relative;height:auto;min-height:0;padding:0 10px;flex-wrap:wrap;gap:0}
 .brand{min-height:46px;padding-right:70px;gap:4px}
 .brand img{height:30px;max-width:92px}
 .header-right{flex:1 0 100%;gap:4px}
 .nav-links{flex:1;justify-content:space-between;margin-right:0;height:56px;font-size:13px}
 .nav-links>a,.help-home-link{padding:0 8px}
 .help-nav{padding:0}
 .header-actions{position:absolute;right:10px;top:8px;gap:6px}
 .account-link{width:30px;height:30px}
}
.theme-dark .search-form input{background:var(--surface);color:var(--text)}
.theme-dark .search-form input::placeholder{color:#aeb9ce}
.shell-detail:has(.comparison){max-width:1032px}
.shell-detail:has(.comparison) .reading-layout{gap:32px}
.comparison.is-ready .comparison-handle{display:grid}
.comparison-handle{display:none;position:absolute;left:var(--position,50%);top:50%;z-index:2;transform:translate(-50%,-50%);place-items:center;width:44px;height:44px;border:2px solid #fff;border-radius:50%;background:#15243be8;box-shadow:0 3px 14px #0007;pointer-events:none}
.comparison-handle svg{width:24px;height:24px;fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.comparison-control{margin-top:0;padding:16px 4px 2px}
.comparison-control input{display:block;appearance:none;-webkit-appearance:none;height:6px;margin:0;border:0;border-radius:999px;background:linear-gradient(90deg,var(--blue) var(--position,50%),var(--line) var(--position,50%));cursor:pointer}
.comparison-control input::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:19px;height:19px;border:3px solid var(--blue);border-radius:50%;background:#fff;box-shadow:0 1px 6px #0004}
.comparison-control input::-moz-range-thumb{width:13px;height:13px;border:3px solid var(--blue);border-radius:50%;background:#fff;box-shadow:0 1px 6px #0004}
.comparison-control input:focus-visible{outline:2px solid var(--blue);outline-offset:5px}
.comparison>figcaption{margin-top:16px}
.video-embed{width:100%;max-width:960px;aspect-ratio:16/9;margin:0 0 8px;overflow:hidden;border-radius:16px;background:#111c2c}
.video-embed iframe{display:block;width:100%;height:100%;border:0}
.video-external-link{margin:0 0 32px;font-size:14px}