@charset "UTF-8";
:root{color-scheme:light;--bg:#fafbf9;--surface:#fff;--ink:#172e35;--muted:#596c70;--line:#d9e3df;--accent:#175f75;--accent-soft:#e5eff0;--paper:#f1f5f0;--mark:#dceac2;--shadow:0 24px 65px #203b3212;--header:76px;font-family:Inter,"Segoe UI","Microsoft YaHei",system-ui,sans-serif;font-synthesis:none}
:root[data-theme=dark]{color-scheme:dark;--bg:#111c20;--surface:#18282c;--ink:#e4eeea;--muted:#a5bab8;--line:#34494c;--accent:#9dd6df;--accent-soft:#223c43;--paper:#203335;--mark:#435b30;--shadow:0 24px 65px #0003}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:104px}body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.75}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}button,a,input,summary,[tabindex="0"]{outline-offset:5px}a:focus-visible,button:focus-visible,input:focus-visible,[tabindex="0"]:focus-visible{outline:2px solid var(--accent)}button{color:inherit}button[hidden],[hidden]{display:none!important}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.3;letter-spacing:-.04em}img{max-width:100%}main:focus{outline:none}::selection{background:var(--mark)}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip{position:fixed;top:-100px;left:20px;z-index:99;background:var(--surface);padding:10px 20px;border:2px solid var(--accent)}.skip:focus{top:10px}
.site-header{height:var(--header);padding:0 max(28px,calc((100vw - 1420px)/2));display:flex;align-items:center;gap:38px;border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:10px;line-height:1.2;flex-shrink:0}.brand span{font-size:23px;letter-spacing:-.04em;font-weight:750}.brand small{display:block;font-size:10px;font-weight:500;letter-spacing:.08em;color:var(--muted);margin-top:5px}.brand img{object-fit:contain}.top-nav{display:flex;gap:27px;margin-left:auto;align-items:center;font-size:14px;white-space:nowrap}.top-nav a:hover{color:var(--accent)}.header-actions{display:flex;gap:9px;align-items:center}.header-actions button,.menu-button{border:1px solid var(--line);background:transparent;border-radius:6px;padding:7px 10px;font-size:12px;white-space:nowrap}.header-actions button:hover,.menu-button:hover{background:var(--accent-soft)}kbd{font-family:inherit;font-size:10px;opacity:.7;margin-left:8px}.section{max-width:1264px;margin:auto;padding:90px 32px}.eyebrow{color:var(--accent);font-size:12px;font-weight:650;letter-spacing:.15em;margin-bottom:24px}.hero{display:grid;grid-template-columns:1.05fr 1fr;align-items:center;gap:65px;min-height:640px;padding-top:94px;padding-bottom:94px}.hero h1{font-size:clamp(38px,4.1vw,61px);font-weight:650;line-height:1.32;margin-bottom:25px;letter-spacing:-.045em}.hero h1 span{color:var(--accent)}.hero-intro{color:var(--muted);font-size:17px;line-height:1.95}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 20px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:32px;border:1px solid var(--line);border-radius:5px;padding:12px 22px;font-size:14px;font-weight:600}.button.primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}.button.primary:hover{background:var(--accent);color:var(--surface);border-color:var(--accent)}.button.secondary:hover{background:var(--accent-soft)}.hero-note{font-size:12px;color:var(--muted)}
.evidence-visual{position:relative;border:1px solid var(--line);border-radius:12px;background:var(--paper);box-shadow:var(--shadow);padding:20px 26px 22px;transform:rotate(-1deg)}.visual-top{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:16px}.visual-top>span:last-child{margin-left:auto;font-size:10px;border:1px solid var(--line);border-radius:3px;padding:0 5px}.live-dot{width:6px;height:6px;border-radius:100%;background:var(--accent)}.visual-paper{background:var(--surface);border:1px solid var(--line);padding:26px 24px 20px;margin:22px 12px 0 0;border-radius:3px}.paper-label{font-size:10px;letter-spacing:.1em;color:var(--muted);margin-bottom:15px}.visual-paper h2{font-size:19px;letter-spacing:-.02em}.sample-lines{font-family:Georgia,"Noto Serif SC",serif;font-size:13px;line-height:2.35;color:var(--muted)}mark{background:var(--mark);color:var(--ink);padding:3px 0}.source-pill{display:flex;justify-content:space-between;color:var(--accent);font-size:10px;border-top:1px solid var(--line);padding-top:11px;max-width:220px}.source-pill span{margin:0 15px}.visual-note{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);padding:20px 24px 16px;margin:13px 0 0 30px;transform:rotate(1deg);box-shadow:0 8px 20px #14352608}.visual-note h3{font-size:18px;margin-bottom:10px}.visual-note ul{padding-left:18px;font-size:12px;color:var(--muted);line-height:2}.citation{font-size:10px;color:var(--accent);background:var(--accent-soft);padding:3px 6px;margin-left:6px;border-radius:3px}.visual-bottom{display:flex;justify-content:space-between;font-size:9px;color:var(--muted);margin-top:20px;letter-spacing:.04em}.workflow-strip{display:flex;justify-content:center;align-items:center;gap:35px;flex-wrap:wrap;padding:25px 30px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:13px}.workflow-strip b{font-size:10px;color:var(--accent);margin-right:9px;font-weight:500}.workflow-strip>span{color:var(--muted)}.workflow-strip a:hover{color:var(--accent)}
.section-heading h2,.directory h2,.principles h2,.closing h2{font-size:38px;font-weight:550;line-height:1.4}.experience-tabs{display:flex;border-bottom:1px solid var(--line);gap:32px;margin-top:38px}.experience-tabs button{border:0;border-bottom:2px solid transparent;background:none;font-size:14px;padding:15px 0;color:var(--muted)}.experience-tabs [aria-selected=true]{border-color:var(--accent);color:var(--accent);font-weight:650}.experience-panel{display:grid;grid-template-columns:1fr 1.25fr;gap:100px;padding-top:45px}.chapter-number{font-size:11px;letter-spacing:.14em;color:var(--muted)}.experience-panel h3{font-size:30px;font-weight:550;margin:20px 0}.experience-panel p{color:var(--muted);font-size:15px}.text-link{display:inline-block;border-bottom:1px solid var(--accent);color:var(--accent);font-size:13px;margin-top:10px;padding-bottom:3px}.feature-rows{margin:0}.feature-rows>div{padding:23px 0;border-bottom:1px solid var(--line)}.feature-rows>div:first-child{padding-top:0}.feature-rows dt{font-size:18px;font-weight:550;margin-bottom:9px}.feature-rows dd{margin:0;font-size:14px;color:var(--muted)}.directory-section{background:var(--paper);border-block:1px solid var(--line)}.directory-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:35px}.directory-heading h2{margin-bottom:0}.directory-heading>p{color:var(--muted);font-size:14px}.directory-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));column-gap:44px;row-gap:40px}.directory-group h3{font-size:14px;font-weight:650;margin:12px 0 0;padding:15px 0;border-bottom:1px solid var(--line)}.directory-group h3>span{color:var(--muted);font-weight:400;margin-right:16px;font-size:11px}.directory-group a{display:block;border-bottom:1px solid var(--line);padding:18px 0 14px}.directory-group a:hover strong{color:var(--accent)}.directory-group strong{display:flex;justify-content:space-between;font-weight:550;font-size:16px;gap:8px}.directory-group strong>span{font-size:12px;color:var(--muted)}.directory-group a p{font-size:12px;color:var(--muted);line-height:1.8;margin:7px 0 0}.principles{display:grid;grid-template-columns:1fr 1.2fr;gap:100px}.principle-list article{display:flex;gap:20px;border-bottom:1px solid var(--line);padding:22px 0}.principle-list article:first-child{padding-top:0}.principle-list article>span{color:var(--accent);font-size:11px;padding-top:6px}.principle-list h3{font-size:18px;font-weight:550}.principle-list p{font-size:14px;color:var(--muted);margin:0}.closing{text-align:center;border-top:1px solid var(--line)}.closing .hero-actions{justify-content:center}.closing>p:last-child{font-size:12px;color:var(--muted);margin-top:25px}.site-footer{display:flex;align-items:center;gap:24px;padding:32px max(28px,calc((100vw - 1200px)/2));border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.footer-brand{font-weight:700;font-size:19px;color:var(--ink)}.site-footer p{margin:0}.site-footer nav{display:flex;gap:20px;margin-left:auto;flex-wrap:wrap}
.guide-layout{display:grid;grid-template-columns:242px minmax(0,790px) 205px;max-width:1470px;margin:auto;justify-content:center;gap:42px;padding:0 28px}.guide-nav{position:sticky;top:var(--header);height:calc(100dvh - var(--header));overflow:auto;padding:28px 18px 36px 0;border-right:1px solid var(--line);font-size:13px;scrollbar-width:thin}.overview-link{display:block;padding:0 10px 20px;color:var(--muted)}.nav-group{margin-bottom:24px}.nav-group p{font-size:11px;letter-spacing:.05em;font-weight:650;margin:0 10px 8px;color:var(--muted)}.nav-group a{display:block;padding:7px 10px;border-radius:4px;line-height:1.5;margin:2px 0}.nav-group a:hover{background:var(--paper)}.nav-group [aria-current=page]{color:var(--accent);background:var(--accent-soft);font-weight:650}.nav-source{display:block;border-top:1px solid var(--line);padding:20px 10px;color:var(--muted);font-size:11px}.doc{padding:55px 0 65px;min-width:0}.doc-heading{border-bottom:1px solid var(--line);margin-bottom:34px;padding-bottom:26px}.doc-heading .eyebrow{margin-bottom:15px}.doc h1{font-size:39px;font-weight:600;margin-bottom:16px}.lead{font-size:16px;color:var(--muted);line-height:1.8;margin-bottom:0}.prose{font-size:15px;line-height:1.95;overflow-wrap:anywhere}.prose p{margin-bottom:20px}.prose h2{font-size:24px;font-weight:600;margin:44px 0 18px;scroll-margin-top:105px}.prose h3{font-size:19px;margin-top:30px}.prose ul,.prose ol{padding-left:24px;margin-bottom:22px}.prose li{padding-left:4px;margin:7px 0}.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--line)}.prose a:hover{text-decoration-color:var(--accent)}.prose strong{font-weight:650}.prose code{font:12px/1.7 Consolas,monospace;background:var(--paper);padding:3px 5px;border-radius:3px;overflow-wrap:anywhere}.prose pre{background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:20px;overflow:auto;font-size:13px}.prose pre code{padding:0;white-space:pre}.table-scroll{overflow-x:auto;max-width:100%;margin:24px 0}.prose table{border-collapse:collapse;width:100%;min-width:390px;font-size:13px;line-height:1.8}.prose th{text-align:left;background:var(--paper);font-weight:600}.prose th,.prose td{border:1px solid var(--line);padding:13px 15px;vertical-align:top}.prose blockquote{border-left:3px solid var(--accent);margin:24px 0;padding:15px 22px;background:var(--paper)}.prose blockquote p{margin:0}.toc{position:sticky;top:var(--header);align-self:start;max-height:calc(100dvh - var(--header));overflow:auto;padding-top:55px;font-size:12px}.toc>p{font-size:11px;font-weight:650;color:var(--muted)}.toc a{display:block;border-left:1px solid var(--line);padding:6px 0 6px 16px;color:var(--muted);line-height:1.65}.toc a:hover,.toc a[aria-current=true]{color:var(--accent);border-left:2px solid var(--accent);padding-left:15px}.page-neighbors{display:grid;grid-template-columns:1fr 1fr;gap:25px;border-top:1px solid var(--line);margin-top:50px;padding-top:22px;font-size:14px}.page-neighbors a:last-child{text-align:right}.page-neighbors small{display:block;color:var(--muted);font-size:11px;margin-bottom:5px}.doc-source{font-size:11px;color:var(--muted);margin-top:35px}.doc-source a{text-decoration:underline;text-underline-offset:3px}
.search-dialog{width:min(680px,calc(100vw - 32px));max-height:80dvh;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);padding:22px;box-shadow:var(--shadow);margin:10dvh auto;overflow:auto}.search-dialog::backdrop{background:#10232680}.search-head{display:flex;align-items:center;justify-content:space-between;gap:15px}.search-head h2{font-size:17px;margin:0}.search-head button{font-size:11px;border:0;background:var(--paper);border-radius:3px;padding:6px 10px}.search-dialog input{display:block;width:100%;background:var(--bg);color:var(--ink);border:1px solid var(--line);padding:12px;margin-top:20px;border-radius:5px;font-size:15px}.search-status{font-size:12px;color:var(--muted);margin:14px 0}.search-results a{display:block;padding:15px 8px;border-top:1px solid var(--line)}.search-results a:hover,.search-results a:focus{background:var(--paper)}.search-results strong{display:block;color:var(--accent);font-size:15px}.search-results small{display:block;color:var(--muted);font-size:10px;margin:3px 0}.search-results p{font-size:12px;line-height:1.7;margin:6px 0 0}.search-hint{color:var(--muted);font-size:11px;border-top:1px solid var(--line);margin:12px 0 0;padding-top:12px}
@media(min-width:901px){.menu-button{display:none}}
@media(max-width:1200px){.site-header{gap:20px}.top-nav{gap:18px}.search-trigger kbd{display:none}.guide-layout{grid-template-columns:215px minmax(0,1fr);gap:32px}.toc{display:none}.hero{gap:35px}.hero h1{font-size:44px}.experience-panel{gap:60px}}
@media(max-width:900px){:root{--header:68px}.site-header{padding:0 20px;gap:15px}.brand small{display:none}.brand span{font-size:21px}.brand img{width:30px;height:30px}.top-nav{gap:16px;font-size:12px}.top-nav a:first-child,.top-nav a:nth-last-child(-n+2){display:none}.header-actions{margin-left:auto}.search-trigger{font-size:0!important}.search-trigger::after{content:'搜索';font-size:12px}.theme-button{display:none}.section{padding:62px 25px}.hero{grid-template-columns:1fr;gap:40px}.hero h1{font-size:46px}.evidence-visual{max-width:550px;width:100%;justify-self:center;transform:none}.workflow-strip{gap:16px;font-size:11px}.workflow-strip>span{display:none}.experience-panel{gap:40px}.directory-grid{grid-template-columns:1fr 1fr;gap:28px}.principles{gap:40px}.site-footer{flex-wrap:wrap;padding:25px}.site-footer nav{width:100%;margin:0}.guide-layout{display:block;padding:0 25px}.guide-nav{position:static;border-right:0;height:auto;max-height:60dvh;border-bottom:1px solid var(--line);padding:20px 0;columns:auto}.js .guide-nav{display:none}.js .guide-nav.is-open{display:block}.nav-group{break-inside:avoid}.doc{max-width:790px;margin:auto;padding-top:38px}.doc h1{font-size:34px}}
@media(max-width:580px){.site-header{padding:0 14px;gap:8px}.brand{gap:6px}.top-nav{gap:12px}.top-nav a:not(.nav-reading){display:none}.header-actions{gap:6px}.header-actions button,.menu-button{padding:6px 8px}.section{padding:48px 20px}.hero h1{font-size:36px}.hero-intro{font-size:15px}.hero-intro br{display:none}.hero-actions{gap:9px}.button{font-size:13px;padding:11px 16px;gap:20px}.evidence-visual{padding:16px}.visual-paper{padding:18px 15px;margin-right:5px}.visual-note{padding:16px;margin-left:14px}.visual-paper h2{font-size:17px}.sample-lines{font-size:11px}.visual-note h3{font-size:16px}.visual-bottom{font-size:8px}.workflow-strip{padding:18px 16px;gap:12px}.workflow-strip b{margin-right:4px}.section-heading h2,.directory h2,.principles h2,.closing h2{font-size:29px}.experience-tabs{gap:24px;margin-top:20px}.experience-tabs button{font-size:13px}.experience-panel{grid-template-columns:1fr;gap:25px;padding-top:28px}.experience-panel h3{font-size:27px}.feature-rows>div{padding:16px 0}.directory-heading{display:block}.directory-heading>p{margin-top:20px}.directory-grid{grid-template-columns:1fr;gap:20px}.principles{grid-template-columns:1fr;gap:30px}.closing{text-align:left}.closing .hero-actions{justify-content:start}.site-footer{gap:12px 20px}.site-footer nav{gap:16px}.guide-layout{padding:0 19px}.guide-nav{columns:auto}.doc h1{font-size:29px}.prose{font-size:14px}.prose h2{font-size:21px;margin-top:34px}.page-neighbors{gap:15px;font-size:12px}.search-dialog{padding:16px}.search-head h2{font-size:15px}.doc-source{line-height:2}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{.site-header,.guide-nav,.toc,.page-neighbors,.site-footer,.search-dialog,.doc-source{display:none!important}.guide-layout{display:block;padding:0}.doc{padding:0;max-width:none}body{background:white;color:black}.prose a{color:inherit}.prose table{min-width:0}.table-scroll{overflow:visible}.prose pre{white-space:pre-wrap}}

/* Product screenshots keep original pixels and open as native full-size images. */
.screenshot-showcase{padding-top:20px}.screenshot-showcase h2{font-size:clamp(28px,3vw,40px)}.product-shot{margin:28px 0 18px}.product-shot img,.prose .screenshot-link img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:7px;background:white}.product-shot a,.prose .screenshot-link{display:block;cursor:zoom-in}.product-shot figcaption{font-size:13px;line-height:1.8;color:var(--muted);margin-top:16px}.product-shot figcaption strong{color:var(--ink)}.prose .screenshot-link{margin:24px 0 12px}.prose .screenshot-link:hover img{border-color:var(--accent)}