:root{--ink:#233d30;--muted:#748077;--paper:#f7f8f3;--line:#dde3d9;--green:#234536;--lilac:#c4a4ff;--soft:#eaf0e4;font-family:"Apple SD Gothic Neo","Noto Sans KR",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{opacity:.3;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #9273cf;outline-offset:4px}[hidden]{display:none!important}.site-header{height:88px;padding:0 5.2%;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:22px}.brand{font-weight:750;font-size:20px;display:flex;align-items:center;gap:12px;letter-spacing:-.5px}.brand-mark{display:grid;place-items:center;width:35px;height:38px;border:1px solid var(--ink);border-radius:2px;font-family:serif;font-size:23px}.brand-author{margin-left:8px;font-weight:400;font-size:13px;color:var(--muted);border-left:1px solid var(--line);padding-left:18px}.header-note{margin-left:auto;font-size:12px;color:var(--muted)}.icon-button{border:1px solid var(--line);background:transparent;border-radius:50%;width:30px;height:30px;display:inline-grid;place-items:center}.intro{position:relative;max-width:1200px;margin:auto;padding:75px 0 63px}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:650;margin:0 0 21px;color:#74816e}.intro h1{font-size:clamp(40px,4.5vw,62px);font-weight:600;line-height:1.28;letter-spacing:-2.7px;margin:0 0 24px}.intro-copy{font-size:15px;line-height:1.9;color:#758073;margin:0}.intro-stamp{position:absolute;right:4%;top:110px;border-left:1px solid #c4cec0;padding-left:28px;display:flex;align-items:center;gap:25px;transform:rotate(-7deg);color:#76866e}.intro-stamp>span:first-child{font-family:Georgia,serif;font-size:17px;line-height:1.4;letter-spacing:3px}.stamp-number{font-family:Georgia,serif;font-size:94px;font-style:italic;color:#bccab4}.collection{max-width:1200px;margin:auto}.collection-heading{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--ink);padding:24px 0}.collection-heading h2{font-size:16px;font-weight:650;margin:0}.collection-heading h2 span{margin-left:10px;font-family:Georgia,serif;color:#8c9784;font-size:13px}.collection-heading>span{font-size:12px;color:var(--muted)}.lecture-card{display:grid;grid-template-columns:1.02fr 1fr;gap:64px;align-items:center}.lecture-cover{background:#e5ecdb;aspect-ratio:1.8;position:relative;overflow:hidden;padding:30px 34px;display:flex;flex-direction:column;transition:background .2s}.lecture-cover:hover{background:#dce7cd}.cover-top,.cover-bottom{display:flex;justify-content:space-between;position:relative;z-index:1;font-size:9px;letter-spacing:1.6px}.cover-top>span:last-child{color:#7a8970}.cover-title{position:relative;z-index:1;font-size:clamp(28px,3vw,43px);font-weight:650;letter-spacing:-1.6px;line-height:1.3;margin-top:32px}.cover-bottom{margin-top:auto;align-items:end;font-size:11px;letter-spacing:0}.cover-arrow{display:grid;place-items:center;background:var(--ink);border-radius:50%;width:34px;height:34px;color:white;font-size:21px}.cover-line{position:absolute;right:-30px;top:110px;width:190px;height:190px;border:1px solid #bccab1;border-radius:50%}.line-two{right:-65px;top:145px}.lecture-meta{display:flex;gap:15px;font-size:11px;color:var(--muted)}.lecture-meta span:first-child{color:#556e43}.lecture-info h3{font-size:32px;letter-spacing:-1.2px;line-height:1.3;font-weight:600;margin:17px 0}.lecture-info p{font-size:13px;color:var(--muted);line-height:1.9;margin:0}.lecture-actions{display:flex;align-items:center;gap:26px;margin-top:27px}.primary-button{background:var(--green);color:white;padding:13px 20px;min-width:139px;font-size:12px;display:flex;justify-content:space-between;gap:35px}.primary-button:hover,.present-button:hover{background:#35604a}.text-link{font-size:11px;border:0;background:none;padding:0;color:#677762;text-decoration:underline;text-underline-offset:4px}.collection-footnote{text-align:right;font-size:10px;color:#91998b;margin:16px 0 0}.site-footer{display:flex;justify-content:space-between;max-width:1200px;border-top:1px solid var(--line);margin:65px auto 0;padding:22px 0 30px;font-size:10px;color:#899180}#viewer{height:calc(100dvh - 88px);display:grid;grid-template-columns:276px 1fr}.sidebar{border-right:1px solid var(--line);display:flex;flex-direction:column;padding:23px 20px 0;min-height:0;background:var(--paper)}.sidebar-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px}.back-link{font-size:11px;color:var(--muted)}.sidebar .eyebrow{font-size:9px;margin-bottom:11px}.sidebar h1{font-size:21px;line-height:1.45;letter-spacing:-.7px;margin:0;font-weight:650}.sidebar-meta{color:var(--muted);font-size:11px;margin:12px 0 23px}.search{display:flex;gap:9px;align-items:center;border:1px solid var(--line);border-radius:4px;background:#fff;padding:9px 10px;margin-bottom:20px}.search>span{font-size:20px;line-height:1}.search input{min-width:0;width:100%;border:0;outline:0;background:transparent;font-size:11px}.search kbd{font-size:10px;color:#9aa093}#slide-list{flex:1;overflow:auto;margin:0 -10px;padding:0 10px 15px;scrollbar-width:thin}.section-label{font-size:10px;color:#8a9482;font-weight:500;padding:18px 9px 8px}.section-label:first-child{padding-top:0}.slide-link{display:flex;align-items:start;gap:11px;padding:11px 9px;border-radius:4px;margin:2px 0;font-size:11px;line-height:1.5}.slide-link:hover{background:#eef1e8}.slide-link[aria-current=page]{background:#e4ebdc;color:#274732;font-weight:650}.slide-number{font-size:10px;font-variant-numeric:tabular-nums;color:#9ba58e;padding-top:1px}.slide-link[aria-current=page] .slide-number{color:#3e653a}.sidebar-bottom{padding:18px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:10px;color:var(--muted)}.workspace{display:flex;flex-direction:column;min-width:0;min-height:0;padding:0 34px 12px;overflow:auto}.viewer-toolbar{height:76px;flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:12px}.breadcrumb{display:flex;align-items:center;gap:10px;font-size:10px;color:#7c8975;white-space:nowrap}.breadcrumb-divider{color:#bdc6b7}.toolbar-actions{display:flex;gap:8px}.small-button{border:1px solid var(--line);background:transparent;border-radius:4px;font-size:10px;padding:9px 12px}.small-button:hover{background:var(--soft)}.present-button{border:0;background:var(--green);color:white;border-radius:4px;font-size:10px;padding:10px 14px}.present-button span{margin-left:10px}.slide-area{display:flex;align-items:center;justify-content:center;flex:1;min-height:0;padding:8px 0 20px}.slide-frame{width:100%;max-height:100%;aspect-ratio:16/9;position:relative;background:white;box-shadow:0 6px 30px #233d300a;border:1px solid #e4e7df;display:flex;align-items:center;justify-content:center}#slide-image{display:block;width:100%;height:100%;object-fit:contain}.image-error{position:absolute;inset:0;background:white;display:grid;place-content:center;gap:20px;text-align:center}.image-error button{border:1px solid var(--line);background:var(--paper);padding:10px}.slide-controls{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:9px 0 25px;flex-shrink:0}.slide-title-group .eyebrow{font-size:8px;margin-bottom:8px}.slide-controls h2{font-weight:550;font-size:17px;margin:0;letter-spacing:-.5px}.navigation{display:flex;align-items:center;gap:16px;white-space:nowrap}.nav-button{border:1px solid var(--line);background:transparent;border-radius:50%;width:36px;height:36px;font-size:17px}.nav-button:hover:enabled{background:var(--soft)}.page-control{font-size:11px;color:#98a08f;display:flex;align-items:center;gap:4px}.page-control input{width:28px;text-align:center;border:0;background:transparent;appearance:textfield;-moz-appearance:textfield;color:var(--ink);font-size:12px}.page-control input::-webkit-inner-spin-button{appearance:none}.progress-track{height:2px;background:#e1e6d9;flex-shrink:0}#progress{height:100%;background:#729563;transition:width .2s}.viewer-footnote{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:15px;color:#9aa28f;font-size:9px;flex-shrink:0}.viewer-footnote .text-link{font-size:9px}kbd{font-family:inherit;font-size:.9em}.slide-text{white-space:pre-wrap;line-height:1.9;font-size:14px;padding:24px;border-top:1px solid var(--line);margin-top:20px}.mobile-only{display:none}dialog{border:1px solid var(--line);border-radius:10px;padding:28px;color:var(--ink);background:var(--paper);max-width:calc(100vw - 32px);max-height:85dvh;box-shadow:0 20px 80px #122e2429}dialog::backdrop{background:#14241cb3;backdrop-filter:blur(4px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:40px;margin-bottom:25px}.dialog-heading h2{font-size:22px;margin:0;letter-spacing:-.7px}.dialog-heading .eyebrow{margin-bottom:8px}#overview{width:1100px}#overview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px 18px}.thumbnail{display:block;min-width:0;border:1px solid transparent;border-radius:4px;background:none;padding:5px;text-align:left}.thumbnail:hover,.thumbnail.active{border-color:#6b8759;background:#e5ecdd}.thumbnail img{display:block;width:100%;aspect-ratio:16/9;border:1px solid var(--line);background:white}.thumbnail span{font-size:11px;display:block;padding:10px 3px 2px;line-height:1.4}#help{width:460px}#help dl{font-size:12px}#help dl div{display:flex;justify-content:space-between;gap:20px;padding:13px 0;border-bottom:1px solid var(--line)}#help dd{margin:0;color:var(--muted)}#help p{font-size:11px;line-height:1.9;color:var(--muted);margin-top:22px}#toast{position:fixed;bottom:30px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--green);color:#fff;border-radius:6px;padding:13px 20px;font-size:12px;transition:.2s;z-index:100}#toast.visible{opacity:1;transform:translate(-50%,0)}body.presenting{background:#101a14}body.presenting .site-header,body.presenting .sidebar,body.presenting .viewer-toolbar,body.presenting .slide-controls,body.presenting .progress-track,body.presenting .viewer-footnote,body.presenting .slide-text{display:none!important}body.presenting #viewer{height:100dvh;display:block}body.presenting .workspace{height:100%;padding:0;overflow:hidden}body.presenting .slide-area{height:100%;padding:0;cursor:pointer}body.presenting .slide-frame{border:0;box-shadow:none;width:min(100vw,177.7778dvh);height:min(56.25vw,100dvh);max-height:none}#presentation-bar{position:fixed;bottom:15px;left:50%;transform:translateX(-50%);background:#182b20ed;color:white;padding:8px 12px;border-radius:8px;display:flex;align-items:center;gap:12px;z-index:20;opacity:0;transition:opacity .2s}body.presenting.controls-visible #presentation-bar,#presentation-bar:hover,#presentation-bar:focus-within{opacity:1}#presentation-bar button{border:0;background:transparent;color:white;font-size:11px;padding:7px}#presentation-count{font-size:11px;font-variant-numeric:tabular-nums;padding:0 8px}.no-results{font-size:12px;line-height:1.8;color:var(--muted);padding:15px 9px}
@media(min-width:1450px){.workspace{padding-left:55px;padding-right:55px}.slide-area{padding-top:20px;padding-bottom:30px}}
@media(max-width:1320px){.intro,.collection,.site-footer{margin-left:6%;margin-right:6%}.lecture-card{gap:45px}.lecture-cover{padding:24px 28px}.cover-title{margin-top:25px}.lecture-info h3{font-size:28px}.lecture-info p{font-size:12px}.breadcrumb #slide-time{display:none}}
@media(max-width:1000px){#viewer{grid-template-columns:235px 1fr}.sidebar{padding-left:15px;padding-right:15px}.workspace{padding-left:22px;padding-right:22px}.small-button{padding:8px}.breadcrumb-divider{display:none}.lecture-card{gap:30px}.lecture-cover{aspect-ratio:1.45}.cover-title{margin-top:35px}.lecture-info p br{display:none}.lecture-actions{gap:16px}.intro-stamp{right:1%}}
@media(max-width:760px){.site-header{height:68px;padding:0 6%}.brand{font-size:18px;gap:10px}.brand-mark{height:31px;width:29px;font-size:20px}.brand-author{font-size:11px;margin-left:3px;padding-left:12px}.header-note{display:none}.site-header>.icon-button{margin-left:auto}.intro{padding:47px 0 43px}.intro h1{font-size:42px;letter-spacing:-2px}.intro-copy{font-size:13px}.intro-stamp{display:none}.eyebrow{font-size:9px}.collection-heading{padding:19px 0}.collection-heading>span{font-size:10px}.lecture-card{grid-template-columns:1fr;gap:25px}.lecture-cover{aspect-ratio:1.7;padding:26px 28px}.cover-title{font-size:36px;margin-top:25px}.cover-top{font-size:8px}.lecture-info h3{font-size:28px;margin:14px 0}.lecture-info h3 br{display:none}.lecture-info p{font-size:12px}.lecture-actions{margin-top:22px}.collection-footnote{text-align:left;margin-top:27px;font-size:9px}.site-footer{margin-top:40px;font-size:9px}#viewer{height:calc(100dvh - 68px);display:block}.mobile-only{display:inline-grid}.sidebar{position:fixed;top:68px;left:0;bottom:0;width:282px;z-index:40;transform:translateX(-100%);transition:transform .2s;padding:20px}.sidebar.open{transform:translateX(0)}.sidebar-overlay{position:fixed;inset:68px 0 0;background:#14241c80;z-index:30;border:0}.workspace{height:100%;padding:0 16px 15px}.viewer-toolbar{height:64px;gap:6px}.breadcrumb{gap:6px;font-size:9px}.breadcrumb #current-section{display:none}.toolbar-actions{gap:5px}.small-button,.present-button{font-size:9px;padding:9px}.present-button span{margin-left:3px}.slide-area{flex:0 0 auto;min-height:0;padding:10px 0 20px;margin:auto 0}.slide-controls{padding:6px 0 20px;align-items:start}.slide-controls h2{font-size:14px;line-height:1.6}.slide-title-group .eyebrow{font-size:8px}.navigation{gap:7px}.nav-button{width:30px;height:30px}.page-control{font-size:10px}.page-control input{font-size:11px;width:23px}.viewer-footnote{font-size:8px;padding-top:13px;gap:4px}.viewer-footnote .text-link{font-size:8px}.desktop-hint{display:none}#overview-grid{grid-template-columns:repeat(2,1fr);gap:18px 10px}dialog{padding:20px}.thumbnail span{font-size:10px}.dialog-heading h2{font-size:20px}.slide-text{padding:20px 5px}body.presenting .slide-area{flex:1 1 auto;margin:0}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Additional lectures share the same browsing and presentation interface. */
.lecture-card + .lecture-card{margin-top:40px;padding-top:40px;border-top:1px solid var(--line)}
.cover-advanced{background:#e9e1f1}.cover-advanced:hover{background:#e1d5ed}.cover-advanced .cover-line{border-color:#c9bad7}.cover-advanced .cover-top>span:last-child{color:#8d7e99}
.intro-stamp .stamp-number{font-size:66px;letter-spacing:-3px}