@view-transition{navigation:auto}:root{color-scheme:light dark;--paper:#fff;--panel:#fff;--soft:#f4f5f9;--ink:#141f4a;--body:#2f3a60;--muted:#646f8b;--line:#e3e6ee;--accent:#2438b8;--on-accent:#fff;--warn:#9a4a14;--l-btc:#e0861d;--l-eth:#4f5fd6;--l-trx:#d3323e;--l-sol:#0f9b7a;--l-bnb:#bd9410;--l-l2:#2a93cf;--l-xl:#141f4a;--sans:-apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", "Segoe UI", sans-serif;--serif:"Noto Serif SC", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", STSong, Georgia, serif;--mono:ui-monospace, "SF Mono", Menlo, Consolas, monospace;--gutter:clamp(18px, 4.4vw, 64px);--max:1360px;--section:clamp(72px, 10vw, 148px);--ease:cubic-bezier(.2, .8, .2, 1)}@media (prefers-color-scheme:dark){:root{--paper:#0d1226;--panel:#131a33;--soft:#182040;--ink:#eff0ea;--body:#c9cfe0;--muted:#98a2bb;--line:#29314f;--accent:#a4b1ff;--on-accent:#0d1226;--warn:#eaa76f;--l-eth:#8493f5;--l-trx:#f0626c;--l-xl:#eff0ea;--l-bnb:#e0b92f}}:lang(zh-Hant){--sans:-apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans CJK TC", "Microsoft JhengHei", "Segoe UI", sans-serif;--serif:"Noto Serif TC", "Songti TC", "Noto Serif CJK TC", "Source Han Serif TC", Georgia, serif}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:84px}body{background:var(--paper);color:var(--body);font:17px/1.9 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;overflow-wrap:anywhere;margin:0}a{color:inherit}img,svg{max-width:100%;height:auto}h1,h2,h3{color:var(--ink);font-family:var(--serif);letter-spacing:-.005em;text-wrap:balance;margin:0;font-weight:700;line-height:1.28}p,li{text-wrap:pretty}button{font:inherit;color:inherit;cursor:pointer}:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}::selection{background:var(--accent);color:var(--on-accent)}.skip{background:var(--panel);z-index:30;padding:8px 14px;position:absolute;top:8px;left:-999px}.skip:focus{left:8px}.kicker{font:600 13px/1.5 var(--sans);letter-spacing:.04em;color:var(--muted);align-items:center;gap:9px;display:flex}.kicker-dot{border:3px solid var(--c,var(--accent));background:var(--paper);border-radius:50%;flex:none;width:11px;height:11px}.ico{box-shadow:0 0 0 1px var(--line);vertical-align:-6px;background:#fff;border-radius:50%;flex:none;padding:2px;display:inline-block}.masthead{z-index:20;padding:13px var(--gutter);background:var(--paper);border-bottom:1px solid var(--line);view-transition-name:masthead;align-items:center;gap:10px 36px;display:flex;position:sticky;top:0}.brand{flex:none;align-items:center;gap:10px;text-decoration:none;display:flex}.brand-mark{width:36px;height:36px;transition:transform .5s var(--ease);flex:none;display:block}.brand:hover .brand-mark{transform:rotate(-30deg)}.brand-name{color:var(--ink);font:700 20px/1.1 var(--serif)}.brand-name small{font:500 8.5px/1.3 var(--mono);letter-spacing:.15em;color:var(--muted);margin-top:3px;display:block}.masthead nav{flex:1;gap:2px 26px;min-width:0;font-size:15px;line-height:1.6;display:flex}.masthead nav a{color:var(--body);flex:none;padding:5px 0;text-decoration:none;transition:color .2s;position:relative}.masthead nav a:after{content:"";background:var(--accent);transform-origin:0;height:2px;transition:transform .35s var(--ease);position:absolute;bottom:0;left:0;right:0;transform:scaleX(0)}.masthead nav a:hover,.masthead nav a[aria-current]{color:var(--ink)}.masthead nav a:hover:after,.masthead nav a[aria-current]:after{transform:scaleX(1)}.masthead-actions{flex:none;align-items:center;gap:14px;font-size:14px;line-height:1.6;display:flex}.lang-switch{background:var(--soft);border-radius:99px;padding:2px;font-size:13px;display:inline-flex}.lang-switch a{color:var(--muted);border-radius:99px;padding:3px 11px;text-decoration:none;transition:color .2s,background .2s}.lang-switch a:hover{color:var(--ink)}.lang-switch a[aria-current]{background:var(--panel);color:var(--ink);box-shadow:0 1px 3px #141f4a24}.nav-invite{background:var(--ink);color:var(--paper);white-space:nowrap;border-radius:99px;padding:6px 15px;font-weight:500;text-decoration:none;transition:background .25s}.nav-invite span{transition:transform .3s var(--ease);display:inline-block}.nav-invite:hover{background:var(--accent);color:var(--on-accent)}.nav-invite:hover span{transform:translate(2px,-2px)}.read-progress{background:var(--accent);transform-origin:0;height:2px;position:absolute;bottom:-1px;left:0;right:0;transform:scaleX(0)}@supports (animation-timeline:scroll()){.read-progress{animation:linear both grow scroll(root)}@keyframes grow{to{transform:scaleX(1)}}}.band{max-width:var(--max);padding:var(--section) var(--gutter) 0;margin:0 auto}.band-tight{padding-top:clamp(48px,6vw,80px)}.band-flush{padding-top:12px}.band-title{margin-bottom:14px;font-size:clamp(22px,2.2vw,28px)}.band-head{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);align-items:end;gap:20px 72px;margin-bottom:40px;display:grid}.band-head h2,.split-head h2,.tool-feature h2{margin-top:14px;font-size:clamp(30px,3.6vw,50px)}.band-head p,.split-head p,.tool-feature-copy p{color:var(--muted);margin:0}.split{grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:start;gap:32px clamp(32px,6vw,96px);display:grid}.split-head{position:sticky;top:104px}.split-head p{margin-top:18px}.more{color:var(--ink);transition:background-size .35s var(--ease);background:linear-gradient(currentColor,currentColor) 0 100%/100% 1px no-repeat;gap:8px;margin-top:14px;font-weight:500;text-decoration:none;display:inline-flex}.more span{transition:transform .3s var(--ease)}.more:hover{background-position:100% 100%;background-size:0 1px}.more:hover span{transform:translate(4px)}.page-head{max-width:var(--max);padding:clamp(48px, 7vw, 104px) var(--gutter) clamp(28px, 4vw, 56px);margin:0 auto}.page-head h1{max-width:17em;margin:18px 0 30px;font-size:clamp(32px,4.8vw,66px);line-height:1.2}.page-intro{grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:12px clamp(32px,6vw,96px);display:grid}.page-intro p{max-width:40em;margin:0}.page-intro a{color:var(--accent);text-underline-offset:3px}.page-lead{color:var(--ink);font:700 clamp(19px, 1.8vw, 24px)/1.5 var(--serif)}.button{background:var(--ink);color:var(--paper);border-radius:99px;align-items:center;gap:9px;padding:13px 24px;font-weight:500;line-height:1.4;text-decoration:none;transition:background .25s,color .25s,box-shadow .25s;display:inline-flex}.button span{transition:transform .3s var(--ease);display:inline-block}.button:hover{background:var(--accent);color:var(--on-accent)}.button:hover span{transform:translate(4px)}.button-line{color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line);background:0 0}.button-line:hover{color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink);background:0 0}.button-line:hover span{transform:translate(3px,-3px)}.rows{border-top:1px solid var(--ink)}.row{border-bottom:1px solid var(--line);align-items:center;gap:12px 28px;padding:22px 4px;text-decoration:none;display:flex;position:relative}.row:before{content:"";background:var(--accent);transform-origin:0;height:2px;transition:transform .5s var(--ease);position:absolute;bottom:-1px;left:0;right:0;transform:scaleX(0)}.row-main{min-width:0;transition:margin .4s var(--ease);flex:1}.row-title{text-wrap:pretty;color:var(--ink);font:700 clamp(18px, 1.55vw, 21px)/1.45 var(--serif);text-decoration:none;transition:color .2s;display:block}.row-title:after{content:"";position:absolute;inset:0}.row-title:focus-visible{outline:none}.row-title:focus-visible:after{outline:2px solid var(--accent);outline-offset:-2px}.row-desc{max-width:44em;color:var(--muted);margin-top:6px;font-size:15px;line-height:1.7;display:block}.row-icons{flex:none;gap:5px;display:flex}.row-meta{color:var(--muted);white-space:nowrap;flex:none;align-items:center;gap:12px;font-size:13px;display:flex}.row-meta b{color:var(--ink);transition:transform .4s var(--ease);font-size:18px;font-weight:400}.row:hover:before{transform:scaleX(1)}.row:hover .row-main{margin-left:8px;margin-right:-8px}.row:hover .row-title{color:var(--accent)}.row:hover .row-meta b{transform:translate(6px)}.group{margin-top:clamp(40px,5vw,72px)}.group:first-child{margin-top:12px}.group h2{margin-bottom:18px;font-size:clamp(21px,2.1vw,28px)}.hero{max-width:var(--max);min-height:min(100svh - 70px,780px);padding:clamp(32px, 4vw, 56px) var(--gutter);grid-template-columns:minmax(0,11fr) minmax(0,10fr);align-items:center;gap:24px clamp(20px,3vw,56px);margin:0 auto;display:grid}.hero-kicker{color:var(--muted);font:600 14px/1.5 var(--sans);letter-spacing:.03em;align-items:center;gap:10px;display:flex}.hero-display{color:var(--ink);font:700 clamp(36px, 4.45vw, 68px)/1.2 var(--serif);letter-spacing:-.012em;margin:22px 0 24px}.hero-display span{white-space:nowrap;display:block}@keyframes rise{0%{opacity:0;transform:translateY(.45em)}to{opacity:1;transform:none}}.anim .hero-display span{animation:rise .9s var(--ease) both}.anim .hero-display span+span{animation-delay:.12s}.hero-deck{max-width:29em;margin:0 0 30px;font-size:clamp(17px,1.4vw,19px);line-height:1.8}.anim .hero-deck{animation:rise .9s .22s var(--ease) both}.hero-actions{flex-wrap:wrap;gap:12px;display:flex}.anim .hero-actions{animation:rise .9s .3s var(--ease) both}.hero-note{color:var(--muted);margin:24px 0 0;font-size:13px;line-height:1.75}.hero-note a{text-underline-offset:3px}.route-figure{min-width:0;margin:0}.route-map{width:100%;display:block;overflow:visible}.ghost path{fill:none;stroke:var(--line);stroke-width:1px;opacity:.55}.route{--c:var(--ink);transition:opacity .3s}.route-btc{--c:var(--l-btc)}.route-eth{--c:var(--l-eth)}.route-trx{--c:var(--l-trx)}.route-sol{--c:var(--l-sol)}.route-bnb{--c:var(--l-bnb)}.route-l2{--c:var(--l-l2)}.route-xl{--c:var(--l-xl)}.line{fill:none;stroke:var(--c);stroke-width:9px;stroke-linejoin:round;stroke-linecap:round;transition:stroke-width .25s var(--ease)}.anim .line{stroke-dasharray:1;stroke-dashoffset:1px;animation:draw 1.5s calc(var(--i) * 90ms + .15s) var(--ease) forwards}.line-hit{fill:none;stroke:#0000;stroke-width:34px}@keyframes draw{to{stroke-dashoffset:0}}.route a{outline-offset:2px}.station{fill:#fff;stroke:var(--c);stroke-width:4px;transition:stroke-width .25s var(--ease)}.rider{fill:#fff;stroke:var(--c);stroke-width:3px}.station-name{font:700 20px var(--serif);fill:var(--ink)}.station-tag{font:13px var(--mono);fill:var(--muted)}.junction{fill:#fff;stroke:var(--l-eth);stroke-width:4px;pointer-events:none}.hub{fill:var(--ink);transition:fill .25s}.hub-link:hover .hub{fill:var(--accent)}.hub-name{font:700 22px var(--serif);fill:var(--paper)}.hub-tag{font:13px var(--sans);fill:var(--paper);opacity:.78}.has-active .route:not(.active){opacity:.2}.route.active .line{stroke-width:12px}.route.active .station{stroke-width:6px}.route-legend{--c:var(--ink);border-left:3px solid var(--c);max-width:460px;min-height:66px;margin:10px auto 0;padding:10px 16px;transition:border-color .25s;display:block}.route-legend b{color:var(--ink);font:700 16px/1.6 var(--serif);display:block}.route-legend span{color:var(--muted);font-size:14px;line-height:1.6;display:block}.anim-done .hero-display span,.anim-done .hero-deck,.anim-done .hero-actions{animation:none}.anim-done .line{stroke-dasharray:none;stroke-dashoffset:0;animation:none}.stops{max-width:var(--max);padding:0 var(--gutter);grid-template-columns:repeat(3,minmax(0,1fr));gap:0 clamp(20px,3vw,48px);margin:clamp(8px,2vw,24px) auto 0;display:grid;position:relative}.stop{padding:34px 0 6px;text-decoration:none;display:block;position:relative}.stop:before{content:"";background:var(--line);height:4px;position:absolute;top:8px;left:0;right:calc(-1*clamp(20px,3vw,48px))}.stop:last-child:before{right:0}.stop:after{content:"";background:var(--accent);transform-origin:0;height:4px;transition:transform .6s var(--ease);position:absolute;top:8px;left:0;right:calc(-1*clamp(20px,3vw,48px));transform:scaleX(0)}.stop:last-child:after{right:0}.stop i{background:var(--paper);border:4px solid var(--ink);z-index:1;width:20px;height:20px;transition:border-color .25s, transform .35s var(--ease);border-radius:50%;position:absolute;top:0;left:0}.stop b{color:var(--ink);font:700 clamp(19px, 1.8vw, 24px)/1.4 var(--serif);transition:color .2s;display:block}.stop span{color:var(--muted);margin-top:8px;font-size:15px;line-height:1.7;display:block}.stop:hover:after{transform:scaleX(1)}.stop:hover i{border-color:var(--accent);transform:scale(1.2)}.stop:hover b{color:var(--accent)}.lines{border-top:1px solid var(--ink);margin:0;padding:0;list-style:none}.lines li{border-bottom:1px solid var(--line)}.lines a{grid-template-columns:124px 150px minmax(0,1fr) 170px;align-items:center;gap:22px;padding:22px 4px;text-decoration:none;display:grid;position:relative;overflow:hidden}.lines a:before{content:"";background:var(--c);transform-origin:0;height:4px;transition:transform .7s var(--ease);position:absolute;bottom:0;left:0;right:0;transform:scaleX(.05)}.lines a:hover:before{transform:scaleX(1)}.line-icons{transition:transform .4s var(--ease);flex-wrap:wrap;gap:6px;display:flex}.lines a:hover .line-icons{transform:translate(6px)}.lines b{color:var(--ink);font:700 clamp(20px, 2vw, 26px)/1.3 var(--serif)}.line-note{color:var(--muted);font-size:15.5px;line-height:1.7}.lines code{color:var(--muted);font:13px var(--mono);text-align:right}.tool-feature{background:var(--soft);border-radius:28px;grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:32px clamp(32px,6vw,96px);padding:clamp(28px,5vw,72px);display:grid}.tool-feature-copy p{margin-top:18px}.tool-links{flex-direction:column;align-items:flex-start;gap:2px;margin-top:12px;font-size:15px;display:flex}.address-tool label,.tool label{color:var(--ink);margin-bottom:14px;font-size:14.5px;font-weight:600;display:block}.address-label{margin-bottom:8px;display:block}.tool select{font-family:var(--sans)!important}.tool input,.tool select,.address-tool textarea{width:100%;font:16px/1.5 var(--mono);color:var(--ink);background:var(--panel);border:1.5px solid var(--line);border-radius:12px;margin-top:7px;padding:12px 14px;transition:border-color .2s,box-shadow .2s;display:block}.address-tool textarea{resize:vertical;margin-top:0;padding:16px 18px;font-size:17px}.tool input:focus,.tool select:focus,.address-tool textarea:focus{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb, var(--accent) 16%, transparent);outline:none}.address-samples{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px 8px;margin:-4px 0 8px;font-size:13.5px;display:flex}.address-samples button{background:var(--panel);border:1px solid var(--line);color:var(--body);border-radius:99px;padding:3px 11px;font-size:13px;transition:border-color .2s,color .2s}.address-samples button:hover{border-color:var(--ink);color:var(--ink)}.address-note{color:var(--muted);margin:12px 0 0;font-size:13px}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 16px;display:grid}.tool-grid>label:last-child:nth-child(odd),.tool-grid>label:first-child:nth-last-child(odd){grid-column:1/-1}.tool-grid>label:first-child:nth-last-child(odd)~label:last-child{grid-column:auto}.tool-out{background:var(--panel);border:1px solid var(--line);border-radius:14px;margin-top:12px;padding:18px 20px;font-size:15.5px;line-height:1.8;display:block}.tool-out:empty{display:none}.tool-out p{margin:0 0 8px}.tool-out p:last-child{margin-bottom:0}.tool-out b{color:var(--ink)}.out-head{flex-wrap:wrap;gap:5px;margin-bottom:8px;display:flex}.out-head:empty{display:none}.out-name b{font:700 19px var(--serif)}.out-tip{color:var(--muted);font-size:14px}.badge{background:color-mix(in srgb, var(--l-sol) 14%, transparent);color:var(--l-sol);border-radius:99px;margin-right:4px;padding:1px 10px;font-size:12.5px;font-weight:600;line-height:1.8;display:inline-block}.badge-warn{background:color-mix(in srgb, var(--warn) 14%, transparent);color:var(--warn)}.tool-layout{max-width:var(--max);padding:8px var(--gutter) 0;grid-template-columns:minmax(0,6fr) minmax(0,7fr);align-items:start;gap:32px clamp(32px,5vw,80px);margin:0 auto;display:grid}.tool-panel{background:var(--soft);border-radius:24px;padding:clamp(20px,3vw,36px);position:sticky;top:92px}.article-head{max-width:var(--max);padding:clamp(32px, 4.5vw, 64px) var(--gutter) clamp(24px, 3vw, 44px);margin:0 auto}.crumbs{color:var(--muted);flex-wrap:wrap;gap:4px 8px;font-size:14px;display:flex}.crumbs a{text-decoration:none}.crumbs a:hover{color:var(--ink);text-underline-offset:3px;text-decoration:underline}.head-icons{flex-wrap:wrap;gap:7px;margin-top:22px;display:flex}.article-head h1{view-transition-name:page-title;max-width:19em;margin:18px 0 20px;font-size:clamp(30px,4.1vw,56px);line-height:1.22}.byline{color:var(--muted);flex-wrap:wrap;gap:4px 18px;margin:0;font-size:14px;display:flex}.byline a{text-underline-offset:3px}.article-layout{max-width:var(--max);padding:0 var(--gutter);grid-template-columns:250px minmax(0,700px);justify-content:start;gap:clamp(28px,6vw,96px);margin:0 auto;display:grid}.article-layout>.prose:only-child{grid-column:2}.toc{align-self:start;max-height:calc(100vh - 110px);font-size:14px;line-height:1.55;position:sticky;top:92px;overflow:auto}.toc summary{color:var(--ink);cursor:pointer;padding-bottom:10px;font-weight:600;list-style:none}.toc summary::-webkit-details-marker{display:none}.toc ol{margin:4px 0 0;padding:0;list-style:none;position:relative}.toc ol:before,.toc ol:after{content:"";background:var(--line);width:3px;position:absolute;top:8px;bottom:12px;left:5px}.toc ol:after{height:calc((100% - 20px) * var(--fill-n,0));background:var(--accent);transition:height .4s var(--ease);bottom:auto}.toc li{color:var(--muted);padding:6px 0 6px 26px;position:relative}.toc li:before{content:"";background:var(--paper);border:3px solid var(--line);z-index:1;width:13px;height:13px;transition:border-color .25s, transform .3s var(--ease);border-radius:50%;position:absolute;top:11px;left:0}.toc li.passed:before{border-color:var(--accent)}.toc li.current:before{border-color:var(--accent);background:var(--accent);transform:scale(1.15)}.toc li.current a{color:var(--ink);font-weight:600}.toc a{text-decoration:none;transition:color .2s;display:block}.toc a:hover{color:var(--ink)}.prose{min-width:0;font-size:17.5px}.prose>:first-child{margin-top:0}.prose h2{margin:2.3em 0 .7em;scroll-margin-top:84px;font-size:clamp(24px,2.4vw,31px)}.prose h2 span{font:600 13px/1.8 var(--sans);letter-spacing:.04em;color:var(--accent);display:block}.prose h3{margin:1.8em 0 .45em;font-size:clamp(19px,1.7vw,22px)}.prose p,.prose ul,.prose ol{margin:0 0 1.15em}.prose li{margin:.35em 0}.prose 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