:root{color-scheme:light;--bg:#fff;--panel:#fff;--soft:#fafafa;--text:#18181b;--muted:#71717a;--line:#e4e4e7;--accent:#3b66fb;--accent-soft:#eef2ff;--code:#0b0b0d;--header:rgba(255,255,255,.78)}
:root.dark{color-scheme:dark;--bg:#0b0b0d;--panel:#141417;--soft:#1f1f23;--text:#f4f4f5;--muted:#a1a1aa;--line:#2e2e33;--accent:#93b4ff;--accent-soft:#202b48;--code:#141417;--header:rgba(11,11,13,.8)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.75 Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","PingFang TC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}a,button,input,summary{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button:disabled{cursor:default}svg{width:18px;height:18px;display:block;flex-shrink:0}button svg{pointer-events:none}[hidden]{display:none!important}.skip{position:fixed;top:-90px;left:16px;background:var(--panel);padding:10px 16px;z-index:100}.skip:focus{top:12px}.site-header{position:sticky;top:0;z-index:40;background:var(--header);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}.bar{height:56px;max-width:1280px;margin:auto;padding:0 32px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;letter-spacing:-.025em;white-space:nowrap}.brand img{width:28px;height:28px;border-radius:6px}.header-search{height:32px;display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--soft);border-radius:8px;padding:0 10px;color:var(--muted);font-size:13px;width:206px}.header-search kbd{margin-left:auto;font:10px ui-monospace,monospace;padding:0 4px;border:1px solid var(--line);border-radius:3px}.desktop-nav{display:flex;gap:4px;margin-left:auto}.desktop-nav a{font-size:14px;color:var(--muted);padding:6px 10px;white-space:nowrap}.desktop-nav a:hover,.desktop-nav a[aria-current]{color:var(--text)}.desktop-nav a[aria-current]{font-weight:600}.actions{display:flex;align-items:center;gap:8px}.language{font-size:12px;color:var(--muted);white-space:nowrap}.icon-button{width:36px;height:36px;display:grid;place-items:center;border:0;background:transparent;color:var(--muted);border-radius:8px}.icon-button:hover{background:var(--soft);color:var(--text)}.login{font-size:14px;white-space:nowrap;padding:6px 10px}.menu-button{display:none}.mobile-menu{border-top:1px solid var(--line);padding:12px 20px;background:var(--bg)}.mobile-menu a{display:block;padding:10px;border-radius:8px}.mobile-menu a:hover{background:var(--soft)}.mobile-menu .language{padding:10px}.sun{display:none}.dark .sun{display:block}.dark .moon{display:none}
.page{position:relative;isolation:isolate;min-height:60vh}.glow{position:absolute;inset:0 0 auto;height:480px;z-index:-1;pointer-events:none;overflow:hidden}.glow:before{content:"";position:absolute;top:-290px;left:50%;transform:translateX(-50%);width:1200px;height:620px;border-radius:50%;background:linear-gradient(100deg,rgba(59,102,251,.21),rgba(139,92,246,.16),rgba(125,211,252,.13));filter:blur(65px)}.glow:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(113,113,122,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(113,113,122,.06) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse 60% 75% at 50% 0%,#000,transparent)}.container{max-width:1280px;margin:auto;padding:0 32px}.hero{text-align:center;padding:82px 0 48px}.badge{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--header);border-radius:999px;padding:4px 13px;font-size:12px;color:var(--muted)}.badge-dot{width:6px;height:6px;background:#3b66fb;border-radius:50%;box-shadow:0 0 0 4px #3b66fb14}.hero h1{font-size:clamp(32px,4.4vw,58px);font-weight:650;line-height:1.2;letter-spacing:-.045em;margin:23px 0}.gradient{background:linear-gradient(100deg,#0b0b0d 5%,#3b66fb 40%,#8b5cf6 72%,#0b0b0d);background-clip:text;-webkit-background-clip:text;color:transparent}.dark .gradient{background-image:linear-gradient(100deg,#fff,#93b4ff,#c4b5fd,#fff)}.hero .intro{max-width:640px;margin:0 auto 25px;font-size:16px;line-height:1.9;color:var(--muted)}.hero-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);background:var(--panel);padding:9px 17px;font-size:14px;border-radius:9px;transition:background .15s,border-color .15s}.button:hover{border-color:#a1a1aa}.button.primary{color:var(--bg);background:var(--text);border-color:var(--text)}.button.primary:hover{opacity:.88}.button svg{width:15px;height:15px}.muted{color:var(--muted)}.eyebrow{font-size:11px;letter-spacing:.1em;font-weight:500;text-transform:uppercase;color:var(--muted)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:0 0 22px}.section-head h2{font-size:24px;font-weight:600;letter-spacing:-.03em;margin:4px 0}.section-head p{font-size:13px;color:var(--muted);margin:0}.guide-library{padding:16px 0 64px}.filters{display:flex;justify-content:space-between;gap:16px;align-items:center;margin:20px 0 24px}.search-box{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:9px;padding:0 12px;min-width:260px;background:var(--panel);color:var(--muted)}.search-box input{width:100%;height:42px;min-width:0;border:0;outline:none;background:transparent;color:var(--text);font-size:14px}.search-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 2px #3b66fb15}.filter-tabs{display:flex;gap:6px;flex-wrap:wrap}.filter-tabs button{border:1px solid transparent;background:transparent;color:var(--muted);padding:6px 12px;border-radius:7px;font-size:13px}.filter-tabs button[aria-pressed=true]{color:var(--text);border-color:var(--line);background:var(--soft)}.filter-tabs button:hover{color:var(--text)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card{display:flex;flex-direction:column;position:relative;min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:25px;transition:border-color .2s,box-shadow .2s,transform .2s}.card:hover{border-color:#3b66fb60;box-shadow:0 10px 35px -18px #3b66fb55;transform:translateY(-2px)}.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.card-icon{width:36px;height:36px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);border:1px solid #3b66fb12;border-radius:9px}.card-category{font-size:12px;color:var(--muted)}.card h3{font-size:19px;font-weight:600;letter-spacing:-.025em;line-height:1.55;margin:0 0 10px}.card h3 a:after{content:"";position:absolute;inset:0;border-radius:12px}.card p{font-size:14px;line-height:1.85;color:var(--muted);margin:0 0 23px;flex:1}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px}.card-bottom .read{display:flex;align-items:center;gap:6px;color:var(--text);font-size:13px}.no-results{text-align:center;border:1px dashed var(--line);padding:38px;border-radius:12px;color:var(--muted)}.no-results button{margin-top:12px}.resource-strip{display:grid;grid-template-columns:1fr auto;align-items:center;gap:24px;border:1px solid var(--line);border-radius:12px;padding:28px 30px;background:linear-gradient(110deg,#3b66fb07,#8b5cf605);margin:0 0 72px}.resource-strip h2{font-size:21px;font-weight:600;margin:0 0 8px}.resource-strip p{font-size:14px;color:var(--muted);margin:0;max-width:660px}.mini-links{display:flex;gap:16px;flex-wrap:wrap;margin-top:14px;font-size:13px}.mini-links a{color:var(--accent)}
.article-wrap{max-width:1200px;padding:30px 32px 72px;margin:auto}.crumb{font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;margin-bottom:35px}.crumb a:hover{color:var(--text)}.article-layout{display:grid;grid-template-columns:210px minmax(0,780px);gap:56px}.toc{align-self:start;position:sticky;top:86px;font-size:13px}.toc-label{font-size:11px;letter-spacing:.1em;color:var(--muted);margin-bottom:12px}.toc nav{border-left:1px solid var(--line)}.toc a{display:block;padding:6px 14px;margin-left:-1px;border-left:1px solid transparent;color:var(--muted);line-height:1.6}.toc a:hover,.toc a[aria-current]{color:var(--accent);border-color:var(--accent)}.toc-back{display:inline-flex!important;margin-top:25px!important;border:0!important;padding-left:0!important}.article{min-width:0}.article-header h1{font-size:clamp(27px,3.1vw,39px);line-height:1.4;letter-spacing:-.035em;font-weight:600;margin:10px 0 15px}.article-header .intro{color:var(--muted);font-size:16px;line-height:1.9;margin:0 0 18px}.meta{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;margin-bottom:28px}.meta img{width:20px;height:20px;border-radius:5px}.article section{margin-bottom:35px;scroll-margin-top:85px}.article h2{font-size:23px;font-weight:600;letter-spacing:-.025em;line-height:1.5;margin:0 0 16px}.article h3{font-size:17px;font-weight:600;margin:22px 0 10px}.article p{margin:12px 0 18px}.article li{margin:9px 0}.article ul,.article ol{padding-left:24px}.article a:not(.button){color:var(--accent);text-underline-offset:4px}.article a:not(.button):hover{text-decoration:underline}.note,.takeaway{border:1px solid #3b66fb25;border-left:3px solid #3b66fb;border-radius:0 9px 9px 0;background:#3b66fb06;padding:17px 20px;font-size:14px}.takeaway{margin:0 0 32px}.takeaway strong{display:block;margin-bottom:6px;font-size:13px}.takeaway p{margin:0;color:var(--muted)}.mobile-toc{display:none;border:1px solid var(--line);border-radius:9px;margin-bottom:28px;padding:12px 16px}.mobile-toc summary{cursor:pointer;font-size:14px;font-weight:500}.mobile-toc a{display:block;padding:6px 0;font-size:13px}.code-box{background:var(--code);color:#f4f4f5;border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:20px 0}.code-head{display:flex;justify-content:space-between;align-items:center;padding:9px 15px;border-bottom:1px solid #ffffff12;font:11px ui-monospace,monospace;color:#a1a1aa}.copy{display:flex;align-items:center;gap:6px;border:0;background:transparent;color:#d4d4d8;font-size:11px;padding:4px 6px;border-radius:5px}.copy svg{width:13px;height:13px}.copy:hover{background:#ffffff13}pre{overflow:auto;margin:0;padding:18px;font-size:12px;line-height:1.85;tab-size:2}code{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}p code,li code,td code{background:var(--soft);padding:2px 5px;border:1px solid var(--line);border-radius:4px;font-size:.87em;overflow-wrap:anywhere}.table-wrap{overflow-x:auto;margin:20px 0;border:1px solid var(--line);border-radius:10px}table{border-collapse:collapse;width:100%;min-width:520px;font-size:13px}th,td{padding:12px 15px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}th{font-weight:500;color:var(--muted);background:var(--soft)}tr:last-child td{border-bottom:0}.related{border-top:1px solid var(--line);padding-top:28px}.related h2{font-size:20px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-card{border:1px solid var(--line);border-radius:9px;padding:16px;color:var(--text)!important;font-size:13px;line-height:1.6}.related-card:hover{border-color:var(--accent);text-decoration:none!important}.related-card span{display:block;color:var(--muted);font-size:11px;margin-bottom:8px}.article-cta{margin-top:30px;background:var(--soft);padding:22px;border-radius:10px}.article-cta h2{font-size:19px;margin-bottom:8px}.article-cta p{font-size:14px;color:var(--muted);margin-top:0}.faq details{border-bottom:1px solid var(--line);padding:14px 0}.faq summary{cursor:pointer;font-weight:500;font-size:15px}.faq details p{color:var(--muted);font-size:14px}.calc{border:1px solid var(--line);padding:22px;border-radius:12px;background:var(--panel)}.calc-fields{display:grid;grid-template-columns:1fr 1fr;gap:15px}.calc label{display:flex;flex-direction:column;gap:6px;font-size:12px;color:var(--muted)}.calc input{min-width:0;width:100%;border:1px solid var(--line);background:var(--soft);border-radius:7px;padding:8px 10px;color:var(--text);font-size:14px}.calc-result{border-top:1px solid var(--line);padding-top:16px;margin-top:20px;display:flex;gap:32px}.calc-result span{font-size:12px;color:var(--muted);display:block}.calc-result strong{font-size:23px;font-weight:600;color:var(--accent)}.calc .calc-caption{font-size:12px;color:var(--muted);margin-bottom:0}.calc-error{color:#dc2626;font-size:13px}.back-top{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--muted);margin-top:28px}
.site-footer{position:relative;border-top:1px solid var(--line);overflow:hidden}.site-footer:before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,#3b66fb70,#8b5cf670,transparent)}.footer-grid{max-width:1280px;margin:auto;padding:48px 32px 25px;display:grid;grid-template-columns:2fr repeat(3,1fr);gap:45px}.footer-grid p{font-size:13px;color:var(--muted);max-width:250px;line-height:1.9}.footer-grid h2{font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.08em;margin:0 0 14px}.footer-grid nav a{display:block;font-size:13px;color:var(--muted);margin:8px 0}.footer-grid a:hover{color:var(--text)}.footer-wordmark{text-align:center;color:transparent;-webkit-text-stroke:1px #3b66fb47;background:linear-gradient(180deg,#3b66fb19,#8b5cf605 70%,transparent);background-clip:text;-webkit-background-clip:text;mask-image:linear-gradient(180deg,#000 30%,transparent 95%);font-size:clamp(60px,14vw,176px);font-weight:600;letter-spacing:-.05em;line-height:1;margin:10px 24px -22px;user-select:none}.footer-bottom{border-top:1px solid var(--line);max-width:1280px;margin:auto;padding:18px 32px;display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:11px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.search-dialog{padding:0;max-width:560px;width:calc(100% - 32px);max-height:80vh;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--text);box-shadow:0 30px 90px -25px #3b66fb60}.search-dialog::backdrop{background:#0006;backdrop-filter:blur(2px)}.dialog-head{display:flex;gap:10px;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line)}.dialog-head input{width:100%;min-width:0;border:0;background:transparent;color:var(--text);outline:none}.dialog-results{padding:10px}.dialog-results a{display:block;padding:12px;border-radius:7px;font-size:14px}.dialog-results a:hover,.dialog-results a:focus{background:var(--soft)}.dialog-results small{display:block;color:var(--muted);font-size:12px;margin-top:3px}.dialog-results p{padding:10px;color:var(--muted);font-size:14px}
@media(min-width:1440px){.hero{padding-top:94px}}@media(max-width:1100px){.header-search{width:170px}.bar{gap:16px}.desktop-nav a{padding:6px}.language{display:none}.article-layout{gap:35px;grid-template-columns:190px minmax(0,1fr)}}@media(max-width:900px){.desktop-nav,.header-search{display:none}.actions{margin-left:auto}.menu-button{display:grid}.bar{padding:0 24px}.container{padding:0 24px}.hero{padding-top:64px}.article-layout{display:block}.toc{display:none}.mobile-toc{display:block}.article-wrap{max-width:840px;padding:25px 24px 56px}.footer-grid{gap:24px;grid-template-columns:1.6fr 1fr 1fr}.footer-grid>div{grid-column:1/-1}.filters{align-items:stretch;flex-direction:column}.search-box{max-width:100%}.search-shortcut{display:grid}}@media(min-width:901px){.search-shortcut{display:none}.mobile-menu{display:none!important}}@media(max-width:600px){.bar{padding:0 16px;gap:10px}.container{padding:0 18px}.hero{padding:49px 0 35px}.hero h1{font-size:34px;line-height:1.35;margin:20px 0}.hero .intro{font-size:14px}.badge{font-size:11px}.hero-actions .button{font-size:13px}.grid{grid-template-columns:1fr;gap:14px}.card{padding:21px}.card h3{font-size:18px}.section-head{align-items:start;flex-direction:column;gap:5px}.section-head h2{font-size:22px}.filters{margin:15px 0 19px;gap:12px}.filter-tabs{gap:2px}.filter-tabs button{font-size:12px;padding:6px 9px}.guide-library{padding-bottom:32px}.resource-strip{grid-template-columns:1fr;padding:23px;margin-bottom:42px;gap:18px}.resource-strip .button{justify-self:start}.resource-strip h2{font-size:19px}.article-wrap{padding:22px 18px 45px}.crumb{margin-bottom:24px;font-size:11px;gap:7px}.article-header h1{font-size:27px}.article-header .intro{font-size:14px}.article h2{font-size:21px}.article{font-size:14px}.meta{font-size:11px;flex-wrap:wrap}.related-grid{grid-template-columns:1fr}.related-card span{margin-bottom:4px}.calc{padding:16px}.calc-fields{gap:12px}.calc-result{gap:24px}.calc-result strong{font-size:21px}.footer-grid{padding:35px 20px 20px;grid-template-columns:1fr 1fr;gap:25px}.footer-grid>div{grid-column:1/-1}.footer-grid p{max-width:100%;margin-bottom:0}.footer-bottom{padding:16px 20px;flex-direction:column;font-size:10px}.footer-wordmark{margin-bottom:-8px}.takeaway{padding:14px 16px}.login{padding:6px 4px}.icon-button{width:34px;height:34px}.card:hover{transform:none}.note{padding:15px}pre{font-size:11px;padding:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.card:hover{transform:none}}

html:not(.js) .header-search,html:not(.js) .search-shortcut,html:not(.js) [data-theme],html:not(.js) .menu-button,html:not(.js) .filters,html:not(.js) .copy,html:not(.js) .calc-fields,html:not(.js) .calc-result{display:none!important}@media(max-width:900px){html:not(.js) #mobile-menu[hidden]{display:block!important}}