:root{--paper:hsl(38 42% 89%);--surface:hsl(40 52% 94%);--ink:hsl(28 38% 11%);--muted:hsl(30 20% 33%);--line:hsl(34 32% 70%);--brand:hsl(159 61% 24%);--brand-soft:hsl(158 42% 88%);--ease:cubic-bezier(.16,1,.3,1);--serif:Georgia,'Noto Serif SC','Songti SC','STSong',serif;--sans:-apple-system,BlinkMacSystemFont,'SF Pro Text','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px;font-size:16px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased;font-feature-settings:'tnum','lnum'}button,a,input{touch-action:manipulation}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:disabled{opacity:.35;cursor:default}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:4px}button:focus-visible,a:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--brand);outline-offset:4px}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}h1,h2,h3,p{margin:0}h1,h2{font-family:var(--serif)}h3{font-size:18px;font-weight:650;line-height:1.5}::selection{background:var(--brand-soft)}.container{width:min(1240px,calc(100% - 96px));margin-inline:auto}.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}.skip-link{position:fixed;top:-60px;left:20px;z-index:100;background:var(--brand);color:#fff;padding:10px 20px;border-radius:6px}.skip-link:focus{top:10px}.mono{font-family:ui-monospace,SFMono-Regular,monospace;font-size:.9em}
.site-header{position:sticky;top:0;z-index:30;background:hsl(38 42% 89% / .94);border-bottom:1px solid hsl(34 32% 70% / .75);backdrop-filter:blur(16px)}.header-inner{height:70px;display:flex;align-items:center;justify-content:space-between;gap:32px}.brand{font-family:var(--serif);font-size:23px;letter-spacing:-.6px;font-weight:700;color:var(--ink);white-space:nowrap}.brand:hover{text-decoration:none}.brand-dot{color:var(--brand)}.desktop-nav{display:flex;gap:32px;margin-left:auto;margin-right:auto}.desktop-nav a{font-size:14px;color:var(--muted);position:relative}.desktop-nav a::after{content:'';position:absolute;bottom:-23px;left:0;right:0;height:2px;background:var(--brand);transform:scaleX(0);transition:transform .25s var(--ease)}.desktop-nav a:hover,.desktop-nav a.active{color:var(--ink);text-decoration:none}.desktop-nav a.active::after{transform:scaleX(1)}.header-github{font-size:14px}.page-progress{height:1px;position:absolute;bottom:-1px;left:0;right:0;overflow:hidden}.page-progress span{display:block;height:100%;width:0;background:var(--brand)}.mobile-menu-button,.mobile-nav{display:none}
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h3{font-family:var(--serif);font-size:22px;margin-bottom:16px}.stage-content p{font-size:14px;color:var(--muted);line-height:1.8}.stage-content .body-copy{margin-bottom:16px}.stage-content .small{font-size:12px;color:var(--muted)}.content-enter{animation:panel-in .32s var(--ease)}@keyframes panel-in{from{opacity:.2;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.segmented-control{display:flex;padding:3px;border-radius:7px;background:#4332220a;margin-bottom:14px;gap:3px}.segment{flex:1;border:0;background:transparent;border-radius:5px;font-size:13px;min-height:34px;padding:7px;transition:background .25s,color .25s}.segment[aria-pressed=true]{background:var(--brand);color:#fff;box-shadow:0 1px 3px #00000014}.input-list{margin:0}.input-list div{display:flex;justify-content:space-between;padding:9px 2px;border-bottom:1px solid hsl(34 32% 70% / .42);font-size:14px}.input-list dt{color:var(--muted)}.input-list dd{margin:0;font-variant-numeric:tabular-nums}.formula{font-family:var(--serif);margin-top:18px;padding:12px 14px;background:#346a4908;border-radius:6px;font-size:19px;font-weight:650;line-height:1.5}.formula .equation{white-space:nowrap}.warning-text{color:#925a22!important}.inline-source{margin-top:14px;display:flex;align-items:center;gap:8px}.text-button{border:0;padding:0;background:none;display:inline-flex;align-items:center;gap:7px;color:var(--brand);font-size:13px;line-height:1.7;font-weight:500}.text-button:hover{text-decoration:underline;text-underline-offset:4px}.text-button:disabled{text-decoration:none}.report-pane{padding:20px;background:#ffffff10;min-width:0}.report-paper{height:100%;position:relative;border:1px solid hsl(34 32% 70% / .48);border-radius:8px;padding:22px 26px 18px 34px;background-color:hsl(41 54% 93% / .72);background-image:linear-gradient(90deg,transparent 20px,hsl(17 52% 63% / .4) 20px,hsl(17 52% 63% / .4) 21px,transparent 21px),repeating-linear-gradient(180deg,transparent 0,transparent 31px,hsl(34 35% 66% / .10) 31px,hsl(34 35% 66% / .10) 32px);box-shadow:0 2px 7px #57422505}.report-heading-row{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:18px}.report-heading-row h3{font-family:var(--serif);font-size:20px}.report-heading-row>span{font-size:10px;color:var(--muted);white-space:nowrap}.metric-link{background:none;padding:0;display:block;width:100%;text-align:left;position:relative;border:0;margin-bottom:12px;border-radius:4px}.metric-label{display:block;font-size:12px;color:var(--muted)}.metric-label span{font-size:11px}.metric-number{display:inline-block;font-family:var(--serif);font-size:43px;line-height:1.3;letter-spacing:-1px;font-weight:700}.accent{color:var(--brand)}.metric-hint{font-size:11px;color:var(--brand);margin-left:12px;opacity:0;transition:opacity .2s}.metric-link:hover .metric-hint,.metric-link:focus-visible .metric-hint{opacity:1}.cfo-metric .metric-number{font-size:35px}.report-divider{height:1px;background:hsl(34 32% 70% / .6);margin:16px 0 12px}#report-text{font-family:var(--serif);font-size:15px;line-height:1.8;margin-bottom:12px}.report-footnote{font-size:10px;color:var(--muted);margin-top:14px}.workbench-footer{border-top:1px solid hsl(34 32% 70% / .5);padding:10px 24px;display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--muted);font-size:11px}.step-controls{display:flex;gap:26px}.step-controls button{font-size:12px}.playback-track{height:2px;background:#27644909}.playback-track span{display:block;background:var(--brand);width:80%;height:100%;transition:width .6s var(--ease)}.demo-note{font-size:11px;color:var(--muted);margin-top:12px;line-height:1.8}.noscript-notice{margin:20px 0;padding:15px;border:1px solid var(--line)}
.source-quote{font-family:var(--serif);border-left:2px solid var(--brand);padding:4px 0 4px 16px;margin:16px 0;color:var(--muted);font-size:15px;line-height:1.8}.stage-title-label{font-size:11px;color:var(--muted);margin-bottom:6px}.thesis-row{padding:12px 0;border-bottom:1px solid hsl(34 32% 70% / .5)}.thesis-row:first-of-type{padding-top:0}.thesis-row strong{font-size:14px;font-weight:600}.thesis-row p{margin-top:5px;font-size:13px}.thesis-row:last-of-type{border-bottom:0}.step-list{padding-left:20px;font-size:13px;color:var(--muted);line-height:1.9}.step-list li{padding:3px 0}.review-callout{padding:12px 14px;border-radius:6px;border:1px solid hsl(34 32% 70% / .6);background:#ffffff20;margin:12px 0 16px}.review-callout strong{font-size:14px}.download-row{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}.status-line{font-size:11px;color:var(--brand);margin-top:10px;min-height:18px}
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@media(min-width:1500px){.hero{padding-top:80px;padding-bottom:76px}}
@media(max-width:1100px){.container{width:calc(100% - 64px)}.hero{gap:32px;grid-template-columns:1.5fr 1fr}.hero h1{font-size:48px}.hero-subtitle{font-size:22px}.hero-description{font-size:14px}.project-meta{font-size:12px}.project-meta div{gap:12px;grid-template-columns:42px 1fr}.desktop-nav{gap:20px}.stage-content{padding:24px}.report-pane{padding:15px}.report-paper{padding:20px 20px 18px 30px}.report-heading-row{flex-wrap:wrap}.stage-index{display:none}.about-section{gap:36px}.contributions{padding-left:32px}}
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@media(max-width:600px){html{scroll-padding-top:78px}.hero h1{font-size:clamp(33px,9.4vw,44px);letter-spacing:-1px}.hero-subtitle{font-size:20px}.hero-description{font-size:14px}.project-meta{grid-template-columns:1fr}.project-meta div:last-child{grid-column:auto}.project-meta div{grid-template-columns:45px 1fr}.hero{padding:35px 0 34px;gap:24px}.hero-actions .button{font-size:13px;min-height:42px;padding:10px 16px}.workbench-body{grid-template-columns:1fr}.stage-content{min-height:370px;border-right:0;border-bottom:1px solid hsl(34 32% 70% / .5);padding:22px 20px}.stage-content h3{font-size:22px}.report-pane{padding:16px}.report-paper{padding:20px 20px 18px 32px}.report-heading-row{margin-bottom:15px;flex-wrap:nowrap}.report-heading-row h3{font-size:19px}.metric-link{display:inline-block;width:48%;vertical-align:top;margin-bottom:0}.metric-number,.cfo-metric .metric-number{font-size:36px}.metric-hint{display:none}.metric-label{font-size:11px}.metric-label span{font-size:9px}#report-text{font-size:15px}.report-footnote{font-size:10px}.workbench-footer{padding:10px 16px}.step-controls{gap:18px}.stage-position{font-size:10px}.sample-line{font-size:11px}.sample-line span{margin:0 4px}.results-table{min-width:500px;font-size:13px}.results-table th,.results-table td{padding:14px 16px}.results-table thead th{font-size:12px}.results-caption{flex-direction:column;font-size:11px;gap:8px}.evaluation-notes{font-size:12px}.about-section{grid-template-columns:1fr;gap:30px}.about-base h3{margin-top:18px}.about-base .project-boundary{margin-top:15px}.contributions{padding-left:0;border-left:0;border-top:1px solid hsl(34 32% 70% / .6);padding-top:28px}.materials-band{align-items:flex-start;flex-direction:column;gap:18px}.materials-actions{width:100%;flex-wrap:wrap}.materials-actions .button{flex:1;min-width:130px}.site-footer{flex-direction:column;gap:6px;padding-top:20px;padding-bottom:24px}.dialog-header{padding:22px 20px 16px}.dialog-header h2{font-size:24px}.dialog-body{padding:18px 20px}.dialog-footer{padding:16px 20px;font-size:12px}.dialog-body p,.dialog-body blockquote{font-size:13px}.formula{font-size:18px}.toolbar-actions{gap:2px}.workbench-title svg{display:none}.workbench-title{font-size:16px}.compact{font-size:12px}.stage-button{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.js-ready .reveal:not(.revealed){opacity:1;transform:none}}
.header-inner .mobile-menu-button{display:none}.js-ready .reveal:not(.revealed){opacity:1;transform:none}.reveal.revealed{animation:panel-in .5s var(--ease)}
@media(max-width:800px){.header-inner .mobile-menu-button{display:flex}}
@media print{body{background:#fff}.site-header,.hero-actions,.toolbar-actions,.stage-nav,.workbench-footer,.playback-track,.materials-band,dialog,.site-footer{display:none!important}.container{width:100%}.hero{padding:10px 0 20px}.hero h1{font-size:36px}.workbench{break-inside:avoid}.results-section{padding-top:24px}.reveal{opacity:1!important;transform:none!important}.stage-content,.report-pane{padding:16px}.about-section{padding:24px 0}.report-paper{background:none}.button{display:none}}
/* Real-company case: retain the paper palette and ordinary website layout. */
.case-intro{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:30px 0 22px}.case-date{font-size:11px;letter-spacing:.08em;color:var(--brand)}.case-intro h3{font-family:var(--serif);font-size:25px;margin-top:7px}.case-intro p{font-size:14px;color:var(--muted);margin-top:7px}.historical-strip{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:26px;padding:18px 0}.historical-strip>div{padding-left:24px;border-left:1px solid hsl(34 32% 70% / .6)}.historical-strip>div:first-child{padding-left:0;border:0}.historical-strip span{display:block;font-size:12px;color:var(--muted)}.historical-strip strong{font-family:var(--serif);font-size:29px;line-height:1.6}.historical-strip small{font:12px var(--sans);font-weight:400;color:var(--muted);margin-left:3px}.workbench-title small{font:11px var(--sans);font-weight:400;color:var(--muted);margin-left:10px}.stage-title-row{display:flex;justify-content:space-between;align-items:baseline;gap:10px}.assumption-tag{font-size:10px;color:var(--muted)}.stage-content{min-height:550px}.stage-content h3{margin-bottom:14px}.lens-control{display:flex;align-items:center;gap:18px;padding:0 2px 10px;border-bottom:1px solid hsl(34 32% 70% / .5)}.lens-control button{border:0;padding:0;background:none;color:var(--muted);font-size:12px}.lens-control button[aria-pressed=true]{color:var(--brand);font-weight:650;text-decoration:underline;text-underline-offset:5px}.lens-control>span{font-size:10px;color:var(--muted);margin-left:auto}.sensitivity-controls{padding:12px 0 6px;display:grid;gap:8px}.sensitivity-controls label{display:flex;align-items:center;gap:8px;font-size:12px;cursor:pointer}.sensitivity-controls input{accent-color:var(--brand);width:15px;height:15px;margin:0;flex-shrink:0}.sensitivity-controls small{font-size:10px;color:var(--muted);margin-left:6px}.stage-content .calculation-note{font-size:11px;line-height:1.7;margin:8px 0 12px;color:var(--muted)}.report-paper{padding-top:24px}.metric-number{font-size:39px;letter-spacing:-.8px}.metric-hint{margin-left:8px}.cfo-metric .metric-number{font-size:34px}.negative{color:#995329}.cash-bridge{padding:8px 0 3px;margin-top:6px;border-top:1px solid hsl(34 32% 70% / .5)}.cash-bridge div{display:flex;justify-content:space-between;gap:14px;font-size:11px;color:var(--muted);padding:3px 0}.cash-bridge b{font-weight:500;font-variant-numeric:tabular-nums}.cash-bridge .bridge-subtotal{color:var(--ink);border-top:1px solid hsl(34 32% 70% / .4);margin-top:3px;padding-top:6px}.pe-line{display:flex;justify-content:space-between;gap:16px;width:100%;font-size:11px;margin-top:15px}.pe-line strong{font-weight:550;white-space:nowrap}.report-divider{margin-top:12px}.report-paper #report-text{font-size:13px;line-height:1.85}.evidence-table{font-size:12px;min-width:420px}.evidence-table th,.evidence-table td{padding:10px;border-bottom:1px solid var(--line);white-space:nowrap}.evidence-table th{font-weight:550}.dialog-body .table-scroll{margin:16px 0}.dialog-body a{white-space:normal}.dialog-body p+p{margin-top:9px}.dialog-body .formula{font-size:16px;overflow-wrap:anywhere}
@media(max-width:1100px){.metric-number{font-size:32px}.metric-hint{display:none}.report-paper{padding-right:18px}.pe-line{flex-wrap:wrap;gap:4px}.historical-strip span{font-size:11px}}
@media(max-width:800px){.case-intro{margin-top:24px;gap:15px}.case-intro h3{font-size:22px}.case-intro p{font-size:12px}.case-intro>.text-button{font-size:11px;flex-shrink:0}.historical-strip strong{font-size:25px}.stage-content{padding:20px;min-height:560px}.metric-number{font-size:30px}.sensitivity-controls label{font-size:11px}.sensitivity-controls small{display:block;margin-left:0}.input-list div{font-size:12px}.cash-bridge div{font-size:10px}}
@media(max-width:600px){.case-intro{display:block}.case-intro>.text-button{margin-top:10px}.case-intro h3{font-size:23px}.historical-strip{gap:12px;margin-bottom:20px;padding:12px 0}.historical-strip>div{padding-left:12px}.historical-strip span{font-size:10px;line-height:1.5;min-height:30px}.historical-strip strong{font-size:23px}.historical-strip small{font-size:9px;margin-left:0}.workbench-title small{margin-left:5px;font-size:10px}.stage-content{min-height:0;padding:22px 20px}.input-list div{font-size:13px}.sensitivity-controls label{font-size:12px}.sensitivity-controls small{display:inline;margin-left:4px}.report-paper .metric-link{width:100%;display:block;margin-bottom:12px}.metric-number,.cfo-metric .metric-number{font-size:35px}.metric-hint{display:inline;opacity:1;font-size:10px}.report-paper .metric-label{font-size:12px}.report-paper .metric-label span{font-size:10px}.cash-bridge div{font-size:11px}.report-paper #report-text{font-size:14px}.pe-line{font-size:11px;flex-wrap:nowrap}.assumption-tag{font-size:9px}.lens-control{gap:14px}.lens-control>span{font-size:9px}.historical-strip small{white-space:nowrap}}
@media(max-width:600px){.results-table{min-width:0;table-layout:fixed;font-size:11px}.results-table th,.results-table td{padding:12px 8px}.results-table thead th{font-size:11px}.results-table th:first-child{width:22%}.results-table td{white-space:nowrap}.results-table th:not(:first-child){width:39%}}
@media(max-width:600px){.evidence-table{min-width:0;font-size:11px}.evidence-table th,.evidence-table td{padding:8px 5px}.evidence-table th{white-space:normal}.evidence-table td{white-space:nowrap}.dialog-header h2{font-size:21px}}