/* Brand primitives → semantic themes → components */
:root{--p-brand:#7657DD;--p-brand-dark:#967EFF;--p-ink:#111113;--p-paper:#FAFAFC;--surface:var(--p-paper);--surface-sunken:oklch(95.8% .006 277.5);--text:var(--p-ink);--text-muted:oklch(43% .012 277.5);--line:oklch(88.5% .009 277.5);--accent:var(--p-brand);--on-accent:var(--p-paper);--figure-surface:oklch(99.2% .002 277.5);--serif:Georgia,"Noto Serif CJK SC","Source Han Serif SC","Songti SC","SimSun",serif;--sans:"Helvetica Neue",Arial,"Noto Sans CJK SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;color-scheme:light}
html[data-theme="dark"]{--surface:var(--p-ink);--surface-sunken:oklch(24.5% .012 277.5);--text:var(--p-paper);--text-muted:oklch(75% .012 277.5);--line:oklch(34% .014 277.5);--accent:var(--p-brand-dark);--on-accent:var(--p-ink);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;min-height:100dvh;background:var(--surface);color:var(--text);font-family:var(--serif);font-size:17px;line-height:1.72;font-feature-settings:"kern","liga","clig","calt";-webkit-font-smoothing:antialiased}img{display:block;max-width:100%}a{color:var(--accent);text-decoration:none;border-bottom:1px dotted currentColor}a:hover{border-bottom-style:solid}button,summary,a{-webkit-tap-highlight-color:transparent}button{font:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}::selection{color:var(--text);background:var(--surface-sunken)}
.skip-link{position:fixed;top:8px;left:8px;z-index:8;padding:8px 16px;background:var(--surface);transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}
.site-header{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;min-height:76px;padding:12px 32px;background:var(--surface);border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;min-height:44px;border:0}.brand img{width:128px;height:auto}.header-actions{display:flex;align-items:center;gap:24px;font-family:var(--sans)}.header-series,.series-label,.section-kicker{font-family:var(--sans);font-size:12px;font-weight:600;line-height:1.4;letter-spacing:.09em;text-transform:uppercase;color:var(--text-muted)}
.text-button{min-width:44px;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:4px;background:var(--surface);color:var(--text);font-family:var(--sans);font-size:13px;cursor:pointer;transition:background-color 140ms ease-out,color 140ms ease-out,border-color 140ms ease-out}.text-button:hover{background:var(--surface-sunken);border-color:var(--accent)}.text-button:active{background:var(--accent);color:var(--on-accent)}
.page-guide{position:fixed;inset:0 auto 0 24px;width:1px;background:var(--line);pointer-events:none}.layout{display:grid;grid-template-columns:224px minmax(0,1fr);gap:56px;max-width:1280px;margin:0 auto;padding:0 48px}.sidebar{position:relative;font-family:var(--sans)}.sidebar-inner{position:sticky;top:116px;padding:48px 0}.sidebar-title{margin:12px 0 28px;color:var(--text);font-size:14px;line-height:1.5}.toc{display:flex;flex-direction:column;border-left:1px solid var(--line)}.toc a{min-height:44px;padding:10px 0 10px 18px;color:var(--text-muted);border:0;font-size:13px;line-height:1.5;transition:color 120ms ease-out,border-color 120ms ease-out}.toc a:hover,.toc a.active{color:var(--accent);border-left:1px solid var(--accent);margin-left:-1px}.sidebar-meta{display:flex;flex-direction:column;gap:8px;margin-top:32px;color:var(--text-muted);font-size:12px}
.paper{min-width:0;max-width:940px;padding:56px 0 32px}.mobile-toc{display:none}.paper-header{padding-bottom:56px}h1,h2,h3,p{margin-top:0}h1{max-width:19ch;margin-bottom:20px;font-family:var(--serif);font-size:clamp(40px,5vw,62px);font-weight:500;line-height:1.08;letter-spacing:-.035em;text-wrap:balance}.subtitle{max-width:58ch;margin-bottom:32px;color:var(--text-muted);font-size:22px;line-height:1.45}.byline{display:flex;flex-wrap:wrap;gap:8px 20px;font-family:var(--sans);font-size:13px;line-height:1.6}.byline a{border:0}.publication-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px;margin:40px 0 0;padding-top:16px;border-top:1px solid var(--line);font-family:var(--sans);font-size:13px}.publication-grid div{display:grid;grid-template-columns:110px 1fr;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}.publication-grid dt{color:var(--text-muted)}.publication-grid dd{margin:0}
.section{padding:56px 0;border-top:1px solid var(--line)}.section-kicker{margin-bottom:12px;color:var(--accent)}h2{max-width:28ch;margin-bottom:24px;font-size:32px;font-weight:500;line-height:1.24;letter-spacing:-.018em;text-wrap:balance}h3{margin:32px 0 12px;font-family:var(--sans);font-size:16px;font-weight:650;line-height:1.45}p{max-width:72ch;margin-bottom:20px}.abstract-grid{display:grid;gap:28px}.abstract-grid article{max-width:74ch}.abstract-grid h3{margin-top:0;color:var(--text-muted);font-size:13px;letter-spacing:.04em}.keywords{font-family:var(--sans);color:var(--text-muted);font-size:13px}.keywords strong{margin-right:12px;color:var(--text);font-weight:600}
.metric-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin:40px 0 24px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.metric-row div{display:flex;flex-direction:column;gap:6px}.metric-row strong{font-family:var(--sans);font-size:28px;font-weight:500;line-height:1.1;font-variant-numeric:tabular-nums}.metric-row span{color:var(--text-muted);font-family:var(--sans);font-size:12px;line-height:1.45}.note{color:var(--text-muted);font-family:var(--sans);font-size:13px;line-height:1.65}
.data-table-wrap{max-width:100%;margin:28px 0 36px;overflow-x:auto}table{width:100%;border-collapse:collapse;font-family:var(--sans);font-size:14px;line-height:1.5}caption{margin-bottom:12px;color:var(--text-muted);text-align:left;font-size:13px}th,td{padding:12px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}thead th{color:var(--text-muted);font-size:12px;font-weight:600}td:not(:first-child),th[scope="col"]:not(:first-child),tbody th+td{text-align:right;font-variant-numeric:tabular-nums}tbody th{font-weight:500}
.paper-figure{margin:40px 0 48px}.figure-open{display:block;width:100%;min-height:44px;padding:16px;border:1px solid var(--line);border-radius:4px;background:var(--figure-surface);cursor:zoom-in;transition:border-color 140ms ease-out}.figure-open:hover{border-color:var(--accent)}.figure-open img{width:100%;height:auto}figcaption{max-width:76ch;margin-top:12px;color:var(--text-muted);font-family:var(--sans);font-size:12px;line-height:1.65}figcaption strong{color:var(--text);font-weight:600}.finding-list{max-width:72ch;margin:24px 0;padding-left:22px}.finding-list li{margin-bottom:12px;padding-left:6px}.boundary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;margin:28px 0}.boundary-grid h3{margin-top:0}.evidence-boundary{border-top-color:var(--accent)}
.download-list{display:grid;margin:28px 0 40px;border-top:1px solid var(--line)}.download-list a{display:flex;align-items:baseline;justify-content:space-between;gap:24px;min-height:56px;padding:16px 0;color:var(--text);border-bottom:1px solid var(--line);font-family:var(--sans)}.download-list a:hover{color:var(--accent)}.download-list small{color:var(--text-muted);font-size:12px;text-align:right}.citation-block{margin:28px 0}.citation-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.citation-heading h3{margin:0}.citation-block p,.citation-block pre{margin:12px 0 0;font-size:14px}pre{max-width:100%;padding:16px;overflow-x:auto;background:var(--surface-sunken);color:var(--text);font-family:var(--mono);font-size:12px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere}code{font-family:var(--mono);font-size:.9em}.paper-footer{padding:32px 0 8px;border-top:1px solid var(--line);color:var(--text-muted);font-family:var(--sans);font-size:12px}.paper-footer p{margin-bottom:8px}
.figure-dialog{width:94vw;max-width:1200px;max-height:92dvh;padding:0;border:1px solid var(--line);border-radius:4px;background:var(--surface);color:var(--text)}.figure-dialog::backdrop{background:oklch(10% .01 277.5/.78)}.dialog-bar{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px;background:var(--surface);border-bottom:1px solid var(--line)}.dialog-bar h2{margin:0;font-family:var(--sans);font-size:15px;letter-spacing:0}.figure-dialog>img{width:100%;max-height:calc(92dvh - 74px);padding:20px;object-fit:contain;background:var(--figure-surface)}
.status-message{position:fixed;right:max(20px,env(safe-area-inset-right));bottom:max(20px,env(safe-area-inset-bottom));z-index:7;max-width:min(320px,calc(100vw - 40px));padding:10px 16px;background:var(--text);color:var(--surface);font-family:var(--sans);font-size:13px;opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity 160ms ease-out,transform 160ms ease-out}.status-message.visible{opacity:1;transform:translateY(0)}
@media(max-width:1023px){.site-header{padding:12px 24px}.page-guide,.sidebar{display:none}.layout{display:block;max-width:940px;padding:0 32px}.paper{max-width:none;padding-top:24px}.mobile-toc{display:block;margin-bottom:40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-family:var(--sans)}.mobile-toc summary{min-height:48px;padding:12px 0;cursor:pointer;font-size:14px}.mobile-toc nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px;padding-bottom:12px}.mobile-toc a{min-height:44px;padding:10px 0;border:0;font-size:13px}}
@media(max-width:640px){body{font-size:16px;line-height:1.68}.site-header{padding:10px 16px}.header-series{display:none}.layout{padding:0 20px}.paper-header{padding-bottom:40px}h1{font-size:39px;letter-spacing:-.025em}h2{font-size:28px}.subtitle{font-size:19px}.publication-grid{grid-template-columns:1fr}.publication-grid div{grid-template-columns:100px 1fr}.section{padding:40px 0}.metric-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 16px}.metric-row strong{font-size:25px}.boundary-grid{grid-template-columns:1fr;gap:8px}.download-list a{flex-direction:column;gap:4px}.download-list small{text-align:left}th,td{padding:10px 12px}.figure-open{padding:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}@media print{.site-header,.sidebar,.mobile-toc,.page-guide,.text-button,.status-message{display:none!important}.layout{display:block;max-width:none;padding:0}.paper{max-width:none;padding:0}.paper-figure,table{break-inside:avoid}a{color:inherit}}