@font-face{font-family:Inter;src:url('fonts/Inter-Regular.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:Inter;src:url('fonts/Inter-Medium.ttf') format('truetype');font-weight:500;font-display:swap}
:root{--paper:#fff;--ink:#212322;--muted:#606060;--composition:#f2f3f3;--selected:#e5e5e5;--line:#d8dbda;--action:#9e5330}
*{box-sizing:border-box}
body{margin:0;background:var(--composition);color:var(--ink);font-family:Inter,Arial,sans-serif}
[hidden]{display:none!important}
a{color:inherit;text-underline-offset:4px}
button,select{font:inherit;color:inherit;cursor:pointer}
button{background:transparent;border:0;border-radius:5px;padding:10px 13px;line-height:1.4}
button:hover:not(:disabled){background:var(--selected)}
button:disabled{opacity:.4;cursor:default}
button:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--ink);outline-offset:4px}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
#lecture{min-height:100svh;max-width:1760px;margin:auto;padding:0 clamp(12px,2.3vw,36px);display:flex;flex-direction:column}



.context-slide{flex:1;background:var(--paper);padding:20px clamp(20px,2.6vw,42px) 16px;min-width:0}
.title-group h1{font-size:clamp(32px,3.1vw,46px);line-height:1.08;letter-spacing:-.035em;font-weight:500;margin:0 0 8px;overflow-wrap:break-word}
.title-group h2{font-size:clamp(20px,1.7vw,24px);font-weight:400;line-height:1.25;color:var(--muted);margin:0}
/* Nodes stay in document flow. Only the connector layer is positioned. */
.map-canvas{--map-layout:horizontal;position:relative;display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,4.1fr);column-gap:clamp(28px,3vw,52px);margin:16px 0 12px;min-width:0}
.map-canvas svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}
.map-path{fill:none;stroke:var(--line);stroke-width:1.5;stroke-linejoin:round;stroke-linecap:round;transition:opacity .45s ease,stroke .45s ease,stroke-width .45s ease}
.map-path.active-path{stroke:var(--ink);stroke-width:2}
.map-path.unrevealed{opacity:0}
.reduction-branches{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,3.15fr);grid-template-rows:1fr auto;gap:22px clamp(28px,3vw,52px);min-width:0}
.selection-branch{display:contents}
#node-selection{grid-column:1;grid-row:1;align-self:center}
.method-groups{grid-column:2;grid-row:1 / 3;display:grid;row-gap:14px;min-width:0}
#node-extraction{grid-column:1;grid-row:2}
.method-group{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.35fr);column-gap:clamp(24px,2.6vw,44px);align-items:center;min-width:0}
.wrapper-content{display:grid;gap:10px;min-width:0}
.map-node{position:relative;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;text-align:left;width:100%;min-width:0;min-height:44px;padding:8px 6px;border:0;border-radius:0;line-height:1.2;background:var(--paper);z-index:1;scroll-margin-top:24px;transition:opacity .45s ease,background-color .25s ease}
.map-node strong{font-size:clamp(19px,1.6vw,24px);font-weight:400;line-height:1.18;overflow-wrap:break-word}
.map-node>span{font-size:13px;line-height:1.4;color:var(--muted);margin-top:6px}
.map-node:hover:not(:disabled){background:var(--composition)}
.map-node.current{background:var(--composition);border-radius:12px}
.map-node.unrevealed{opacity:0;visibility:hidden;pointer-events:none}
.root-node{align-self:center}
.root-node strong{font-size:clamp(21px,1.75vw,26px);font-weight:500}
.secondary-node strong{color:var(--muted)}
.examples-node ul{padding:0;margin:0;list-style:none;line-height:1.4;font-size:16px;overflow-wrap:break-word}
.examples-node li+li{margin-top:5px}
.example-qualifier{font-size:13px;color:var(--muted)}
.acronym{white-space:nowrap}
.pfi-node{border-radius:12px;background:var(--composition);padding:12px}
.pfi-node strong{font-size:clamp(19px,1.5vw,23px);font-weight:500;line-height:1.22}
.pfi-node>span{font-size:13px}
.map-bottom{border-top:1px solid #eceeed;padding-top:10px}
.map-bottom p{font-size:14px;line-height:1.5;color:var(--muted);margin:0;min-height:24px;max-width:900px}

.lecture-footer{min-height:60px;padding:10px 0;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.slide-controls{display:flex;align-items:center;gap:10px;font-size:14px;flex-wrap:wrap}
.slide-controls button{padding:10px;white-space:nowrap}
#select{font-size:13px;background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:9px 8px;max-width:170px}
#position{font-size:13px;font-variant-numeric:tabular-nums;white-space:nowrap}




@media(max-width:979px){
 .map-canvas{--map-layout:stacked;display:block;padding-left:4px;margin-top:24px}
 .root-node{max-width:290px;margin-bottom:20px}
 .reduction-branches{display:block;padding-left:32px}
 .selection-branch{display:block}
 #node-selection{max-width:290px;margin-bottom:20px}
 .method-groups{display:grid;padding-left:28px;row-gap:20px}
 .method-group{grid-template-columns:minmax(0,.85fr) minmax(0,1.35fr);column-gap:32px}
 #node-extraction{max-width:310px;margin-top:24px}
 .map-node strong{font-size:20px}
 .root-node strong{font-size:23px}
 .pfi-node strong{font-size:20px}
 .examples-node ul{font-size:16px}
}
@media(max-width:599px){
 #lecture{padding:0 10px}


 .context-slide{padding:24px 16px 22px}
 .title-group h1{font-size:32px}
 .title-group h2{font-size:22px}
 .map-canvas{--map-layout:narrow;margin-top:26px;padding-left:0}
 .reduction-branches{padding-left:20px}
 .method-groups{padding-left:20px;row-gap:26px}
 .method-group{display:block}
 .method-group>.examples-node,.wrapper-content{margin:14px 0 0 18px;width:calc(100% - 18px)}
 .map-node{padding:10px 8px;scroll-margin-top:155px}
 .map-node strong{font-size:21px}
 .root-node strong{font-size:23px}
 .map-node>span{font-size:14px}
 .examples-node ul{font-size:16px}
 .pfi-node{padding:15px 13px}
 .pfi-node strong{font-size:21px}
 .pfi-node>span{font-size:13px}
 .map-bottom p{font-size:14px}
 .lecture-footer{gap:8px}
 .slide-controls{gap:3px;font-size:13px;width:100%;justify-content:space-between}
 .slide-controls button{padding:10px 5px}
 #select{font-size:12px;max-width:130px;padding:9px 5px}
 #position{font-size:12px}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* A single white presentation surface, shared by every slide. */
body{background:var(--paper)}
.context-slide{padding-left:0;padding-right:0;padding-top:28px}

.lecture-footer{justify-content:flex-end;min-height:60px}
@media(max-width:599px){#lecture{padding:0 22px}.context-slide{padding-left:0;padding-right:0;padding-top:24px}.lecture-footer{padding-bottom:16px}.slide-controls{font-size:12px;gap:2px}.slide-controls button{padding:9px 2px}#select{max-width:135px;font-size:11px}#position{font-size:11px}}