:root{--bg:#f5f3ed;--paper:#fffcf6;--ink:#242b25;--muted:#62695f;--green:#3c563e;--line:#d9dcd0;--pale:#e5eadb;--accent:#815138;--serif:'Noto Serif SC','Source Han Serif SC','Songti SC','SimSun',serif;--sans:'Noto Sans SC','Microsoft YaHei',system-ui,sans-serif;color-scheme:light;font-family:var(--sans);font-size:16px;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--green);text-underline-offset:4px}button:focus-visible,a:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #b97540;outline-offset:3px}button{color:inherit}button:disabled{opacity:.5;cursor:wait}[hidden]{display:none!important}.skip{position:fixed;left:10px;top:-80px;background:white;padding:14px;z-index:99}.skip:focus{top:6px}.preview-strip{min-height:38px;background:#e8e7df;border-bottom:1px solid var(--line);padding:5px 30px;display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#555c51;gap:12px}.preview-strip i{display:inline-block;width:6px;height:6px;background:#926b3f;border-radius:50%;vertical-align:2px;margin-right:5px}.preview-strip select{border:0;background:transparent;color:var(--green);padding:5px;font-size:13px;min-height:28px}.topbar{height:82px;background:var(--paper);display:flex;align-items:center;border-bottom:1px solid var(--line);padding:0 32px;gap:45px}.brand{width:205px;display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;letter-spacing:.07em;font-size:14px}.brand b{font-weight:400;color:var(--muted)}.brand-symbol{font:italic 32px Georgia,serif;color:var(--green);border:1px solid #bfc8b7;width:38px;height:42px;display:grid;place-items:center}.top-context{font-size:14px;color:var(--muted)}.top-context span{margin:0 13px;color:#afb6a8}.privacy-label{margin-left:auto;font-size:13px;color:var(--muted)}.layout{max-width:1540px;margin:auto;display:grid;grid-template-columns:250px minmax(0,1fr)}.sidebar{border-right:1px solid var(--line);padding:40px 24px 28px;display:flex;flex-direction:column;min-height:calc(100vh - 120px)}.eyebrow{font-size:12px;letter-spacing:.11em;color:var(--muted);margin:0 0 10px}.sidebar h2{font:28px/1.4 var(--serif);margin:0 0 8px}.side-description{font-size:13px;color:var(--muted);line-height:1.8;margin:0 0 34px}.sidebar nav{display:grid;gap:6px}.nav{border:0;background:transparent;padding:15px 14px;border-radius:3px;display:flex;align-items:center;justify-content:space-between;text-align:left;font-size:15px;min-height:50px}.nav small{font-size:12px;color:var(--muted)}.nav.active{background:var(--pale);color:var(--green);font-weight:650}.nav:hover{background:#eaece2}.side-bottom{margin-top:60px;font-size:13px;color:var(--muted);line-height:1.9}.side-bottom a{font-size:13px;text-decoration:none}.side-rule{display:block;width:30px;height:1px;background:#bcc5b3;margin-bottom:20px}main{padding:30px 48px 70px;min-width:0}.document-bar{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted);padding-bottom:24px;gap:18px;border-bottom:1px solid var(--line)}.document-bar label{display:flex;gap:8px;align-items:center}.document-bar select{max-width:230px;font-size:13px;background:transparent;border:0;color:var(--green);min-height:38px;padding:5px}.status-dot{display:inline-block;width:6px;height:6px;background:var(--green);border-radius:50%;margin-right:9px}.title-row{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:30px 0 25px}.title-row h1,.gate h1{font:36px/1.4 var(--serif);font-weight:600;letter-spacing:.015em;margin:6px 0 10px}.lede{color:var(--muted);font-size:15px;line-height:1.8;margin:0}.primary,.secondary{min-height:44px;border-radius:3px;padding:11px 20px;font-size:14px;line-height:1.5}.primary{background:var(--green);color:var(--paper);border:1px solid var(--green)}.primary:hover{background:#2d432f}.secondary{background:transparent;border:1px solid #b9c3af;color:var(--green)}.secondary:hover{background:var(--pale)}.summary-grid{display:grid;grid-template-columns:minmax(0,1fr) 232px;gap:32px}.paper{background:var(--paper);border:1px solid var(--line);padding:30px 34px}.paper h2{font:23px/1.55 var(--serif);margin:0 0 17px}.finding{padding:23px 0;border-top:1px solid var(--line)}.finding:first-of-type{border-top:0;padding-top:2px}.finding .number{font:14px Georgia,serif;color:var(--accent);display:block;margin-bottom:10px}.finding h3{font-size:19px;line-height:1.6;font-weight:550;margin:0 0 10px}.finding p{font-size:16px;line-height:1.95;margin:0;color:#434d42}.text-action{display:inline-flex;border:0;background:none;color:var(--green);padding:10px 0;font-size:13px;min-height:40px;gap:8px;align-items:center}.text-action:hover{text-decoration:underline;text-underline-offset:4px}.margin-notes{padding:6px 0}.margin-notes h3{font-size:14px;margin:0 0 16px;font-weight:650}.note-block{border-top:1px solid var(--line);padding:20px 0}.note-block:first-child{border:0;padding-top:0}.note-block p,.note-block li{font-size:14px;line-height:1.9;color:var(--muted)}.note-block ul{padding-left:18px;margin-bottom:0}.big-number{font:44px/1 Georgia,serif;color:var(--green);margin:15px 0 8px}.big-number span{font:14px var(--sans);margin-left:8px;color:var(--muted)}.stage-label{display:inline-block;padding:5px 9px;font-size:12px;background:var(--pale);color:var(--green);border-radius:3px}.reading-list{display:grid;margin-top:26px;border-top:1px solid var(--line)}.reading-link{padding:20px 0;border-bottom:1px solid var(--line);border-left:0;border-right:0;border-top:0;background:none;display:flex;justify-content:space-between;align-items:center;text-align:left;gap:12px;font-size:16px;color:var(--green)}.reading-link small{display:block;font-size:13px;color:var(--muted);margin-top:7px}.toolbar{display:flex;gap:14px;margin-bottom:22px;align-items:center;flex-wrap:wrap}.toolbar input{min-height:44px;border:1px solid var(--line);border-radius:3px;background:var(--paper);padding:9px 13px;flex:1;min-width:150px}.toolbar select{min-height:44px;background:var(--paper);border:1px solid var(--line);padding:9px;font-size:14px}.toolbar .muted{font-size:13px}.plan-list{display:grid;gap:12px}.slide{background:var(--paper);border:1px solid var(--line);border-radius:3px;scroll-margin-top:20px}.slide summary{display:flex;align-items:center;padding:18px 20px;gap:17px;cursor:pointer;list-style:none}.slide summary::-webkit-details-marker{display:none}.page-num{font:23px/1 Georgia,serif;min-width:32px;color:var(--accent)}.slide-title{flex:1;font-size:16px;line-height:1.65}.slide .chevron{color:var(--green);font-size:20px;transition:transform .12s}.slide[open] .chevron{transform:rotate(90deg)}.slide-body{padding:0 23px 23px 69px}.slide-body p{font-size:15px;line-height:1.9}.label{font-size:12px;color:var(--muted);display:block;margin:15px 0 6px;letter-spacing:.04em}.slide-actions{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);margin-top:15px;padding-top:7px;gap:10px}.slide-actions small{font-size:12px;color:var(--muted)}.research-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:24px}.research-tab{padding:12px 16px;min-height:44px;border:1px solid var(--line);background:transparent;font-size:14px;color:var(--green)}.research-tab.active{background:var(--green);border-color:var(--green);color:var(--paper)}.prose{font-size:16px;line-height:1.95;overflow-wrap:anywhere}.prose h1{font:30px/1.5 var(--serif)}.prose h2{font:24px/1.55 var(--serif);margin-top:32px}.prose h3{font-size:19px;margin-top:28px}.prose p{margin:14px 0}.prose a{font-size:14px}.prose ul{padding-left:24px}.prose code{background:#ecefe4;padding:1px 4px;font-size:14px}.table-scroll{overflow-x:auto;margin:20px 0}.prose table{border-collapse:collapse;font-size:14px;min-width:520px;width:100%;line-height:1.75}.prose td,.prose th{border-bottom:1px solid var(--line);padding:12px;text-align:left;vertical-align:top}.prose th{background:var(--pale);font-weight:500}.research-reading{padding:30px;max-width:900px}.empty{padding:45px 22px;text-align:center;border:1px dashed #c2caba;background:#faf9f2;color:var(--muted)}.empty h2{font:24px var(--serif);color:var(--ink);margin:0 0 15px}.empty p{font-size:15px;line-height:1.8}.comment{padding:23px 25px;border:1px solid var(--line);background:var(--paper);margin-bottom:14px;overflow-wrap:anywhere}.comment-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--muted)}.avatar{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--pale);color:var(--green);font-size:14px}.comment-head strong{font-size:14px;color:var(--ink)}.comment-body{white-space:pre-wrap;font-size:16px;line-height:1.9;margin:17px 0}.context-link{background:transparent;border:0;font-size:13px;color:var(--green);padding:8px 0;text-align:left}.comment-status{margin-left:auto;font-size:12px;padding:4px 8px;background:var(--pale)}.comment-status.deferred{background:#ece5da;color:#795539}.comment-actions{border-top:1px solid var(--line);display:flex;align-items:center;gap:16px;padding-top:10px}.comment-actions select{margin-left:auto;min-height:36px;border:1px solid var(--line);background:transparent;font-size:13px;padding:4px 8px}.reply{margin-top:18px;padding:13px 17px;background:#f0f1e8;border-left:2px solid #a9b89f;white-space:pre-wrap;font-size:14px;line-height:1.8}.reply strong{display:block;font-size:13px;margin-bottom:5px}.gate{max-width:650px;padding:80px 15px}.gate p{font-size:16px;line-height:2;color:var(--muted)}.gate>div{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}dialog{max-width:560px;width:calc(100% - 32px);padding:28px;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:5px;box-shadow:0 22px 80px #25332624}dialog::backdrop{background:#222b2355}.dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.dialog-head h2{font:23px/1.5 var(--serif);margin:0}.close{border:0;background:transparent;font-size:29px;min-height:44px;min-width:44px}.context-note{font-size:13px;line-height:1.8;color:var(--muted);padding:12px;background:var(--pale);margin:20px 0}.field{display:grid;gap:9px;font-size:14px}.field textarea{width:100%;resize:vertical;border:1px solid #bac4b4;background:#fffefa;border-radius:3px;padding:12px;line-height:1.8;font-size:16px;min-height:150px}.dialog-footer{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:20px}.dialog-footer span{font-size:13px;color:var(--muted)}#form-error,#error{font-size:14px;color:#a53630;line-height:1.8}#error{padding:20px;border:1px solid #cba8a1;background:#fff5f0}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--green);color:white;box-shadow:0 5px 20px #20302518;padding:12px 20px;border-radius:3px;font-size:14px;z-index:90;opacity:0;pointer-events:none;transition:opacity .12s;max-width:calc(100% - 32px);text-align:center}#toast.show{opacity:1}.offline-note{font-size:13px;color:var(--muted);line-height:1.7}.muted{color:var(--muted)}
@media(min-width:1450px){main{padding:34px 65px 80px}.summary-grid{gap:42px;grid-template-columns:minmax(0,1fr) 245px}}
@media(max-width:1100px){.summary-grid{grid-template-columns:1fr}.margin-notes{display:grid;grid-template-columns:1fr 1fr;gap:24px}.note-block{border-top:1px solid var(--line)!important;padding-top:18px!important}.layout{grid-template-columns:210px minmax(0,1fr)}main{padding:26px}.brand{width:165px}.sidebar{padding:30px 17px}}
@media(max-width:720px){.preview-strip{padding:6px 15px;font-size:11px;gap:5px;align-items:center}.preview-strip label{font-size:0;white-space:nowrap}.preview-strip select{font-size:12px;max-width:98px}.topbar{height:66px;padding:0 18px;gap:15px}.brand{width:auto;font-size:12px;gap:8px}.brand-symbol{font-size:26px;width:30px;height:34px}.top-context{margin-left:auto;font-size:12px}.privacy-label{display:none}.layout{display:block}.sidebar{min-height:0;padding:13px 15px 0;border-right:0;border-bottom:1px solid var(--line);background:var(--paper)}.sidebar>.eyebrow,.sidebar>h2,.side-description,.side-bottom{display:none}.sidebar nav{display:flex;gap:4px;overflow-x:auto;padding-bottom:12px}.nav{padding:10px 12px;justify-content:center;white-space:nowrap;min-height:44px;flex:1;font-size:13px;gap:5px}.nav small{display:none}main{padding:19px 17px 50px}.document-bar{padding-bottom:13px;gap:6px;font-size:12px;align-items:center}.document-bar label{font-size:0;gap:0}.document-bar select{font-size:12px;max-width:188px;padding:4px 0}.title-row{margin:22px 0 19px;display:block}.title-row h1{font-size:28px;line-height:1.5}.title-row>.secondary{margin-top:17px;width:100%}.lede{font-size:14px}.paper{padding:22px 21px}.finding{padding:20px 0}.finding h3{font-size:18px}.finding p{font-size:16px;line-height:1.9}.paper h2{font-size:22px}.margin-notes{display:block}.note-block{padding:22px 0}.summary-grid{gap:16px}.reading-link{font-size:15px}.slide summary{padding:15px 14px;gap:10px}.page-num{font-size:21px;min-width:28px}.slide-title{font-size:15px}.slide-body{padding:0 16px 19px}.slide-actions{flex-wrap:wrap}.research-reading{padding:20px 16px}.prose h1{font-size:25px}.prose h2{font-size:21px}.research-tab{padding:10px;font-size:13px;flex:1}.toolbar{gap:8px}.toolbar input{width:100%;flex-basis:100%}.comment{padding:18px}.comment-head{gap:8px}.comment-head time{font-size:12px}.gate{padding:38px 2px}.gate h1{font-size:32px}.gate p{font-size:15px}.gate .primary,.gate .secondary{width:100%}dialog{padding:20px}.dialog-head h2{font-size:21px}.dialog-footer{align-items:center}.dialog-footer .primary{padding:11px 15px}.table-scroll{max-width:100%}.prose table{font-size:13px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
@media(max-width:360px){.top-context{display:none}.brand{white-space:nowrap}.sidebar nav{gap:2px}.nav{padding:10px 6px;font-size:12px;min-width:0}.preview-strip{padding-left:12px;padding-right:12px}}

.account-identity{margin-left:auto;display:flex;gap:14px;align-items:center;font-size:14px}.account-identity button{background:none;border:0;color:var(--green);padding:10px}.login-field{display:grid;gap:8px;margin:16px 0;font-size:14px}.login-field input{padding:12px;border:1px solid var(--line);background:var(--paper);font:inherit;border-radius:3px}.gate form{max-width:370px}.gate .primary{width:100%}@media(max-width:720px){.account-identity{gap:7px;font-size:12px}.account-identity button{font-size:12px}.top-context{display:none}}

@media(max-width:360px){.topbar{padding:0 12px;gap:6px}.account-identity{gap:4px}.account-identity #account-name{max-width:56px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account-identity button{white-space:nowrap;padding:8px 4px;font-size:12px}}

.sample-downloads{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 26px}.sample-downloads a{text-decoration:none;display:inline-flex;align-items:center;padding:10px 16px}.sample-figure{margin:0 0 22px}.sample-figure img{display:block;width:100%;height:auto;border:1px solid var(--line)}.sample-figure figcaption{margin-top:10px;font-size:14px}.sample-talk{border-top:1px solid var(--line);padding:16px 0}.sample-talk>summary{font-size:16px;cursor:pointer;color:var(--green)}.sample-talk p{font-size:16px;line-height:1.9;overflow-wrap:anywhere}.research-reading a{overflow-wrap:anywhere}@media(max-width:600px){.sample-downloads{gap:8px}.sample-downloads a{font-size:13px;padding:9px 11px}.sample-talk p{font-size:15px}.slide-actions{flex-wrap:wrap}.sample-figure{margin-left:-8px;margin-right:-8px}}

.additional-downloads{margin:-10px 0 26px;color:var(--green)}.additional-downloads>summary{cursor:pointer;padding:8px 0;font-size:14px}.additional-downloads .sample-downloads{margin:10px 0}

/* Version library: every row opens its version in one action. */
button.material-version-row{width:100%;font:inherit;text-align:left;color:var(--ink);background:transparent;border:0;border-bottom:1px solid var(--line);padding:23px 12px;cursor:pointer;border-radius:0}
button.material-version-row:hover{background:var(--paper)}
button.material-version-row:focus-visible{outline:2px solid var(--green);outline-offset:3px;background:var(--paper)}
.material-version-main{min-width:0}.material-version-main strong{overflow-wrap:anywhere}
.material-version-action{display:flex;align-items:center;gap:22px;flex-shrink:0}.material-version-open{color:var(--green);white-space:nowrap;font-size:15px}
@media(max-width:600px){button.material-version-row{padding:20px 4px}.material-version-action{flex-direction:column;align-items:flex-end;gap:10px}.material-version-open{font-size:14px}}

.summary-slide-links{display:grid;gap:8px;margin:16px 0 20px}.summary-slide-links>strong{font-size:13px;color:var(--muted,#68715f)}.summary-slide-links a{display:block;padding:10px 12px;min-height:42px;background:#edf0e5;border:1px solid #d1d9c5;border-radius:6px;font-size:14px;line-height:1.5;text-decoration:none;color:#3c563e}.summary-slide-links a:hover{background:#e1e8d4}.summary-slide-links a:focus-visible{outline:2px solid #7d8959;outline-offset:2px}