/* joohyung00.github.io — layout "Ledger", palette "Warm paper". Single stylesheet, no framework.
   Tokens first; everything else reads from them. Dark mode = html[data-mode="dark"]. */
:root{
  --bg:#fbf8f1; --surface:#f3eee2; --surface2:#ebe3d0; --ink:#1d1a16; --muted:#6f675c; --line:#e3dccc;
  --accent:#8f5f0d; --accent-soft:rgba(143,95,13,.12);
  --sans:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Noto Sans KR",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
html[data-mode="dark"]{
  --bg:#0f0e0c; --surface:#181714; --surface2:#221f19; --ink:#e9e2d3; --muted:#8c8270; --line:#2a2822;
  --accent:#e2b25c; --accent-soft:rgba(226,178,92,.16);
}

/* ---------- base */
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.6;font-size:15.5px;-webkit-font-smoothing:antialiased;transition:background .2s,color .2s}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline;text-underline-offset:4px}
p{margin:0 0 12px} ul{margin:0;padding:0;list-style:none} h2,h3{font-weight:700}
img{max-width:100%}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.chip{display:inline-block;padding:3px 11px;border:1px solid var(--line);background:var(--surface);border-radius:999px;font-size:13px;color:var(--ink)}
.badge{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.05em;padding:2px 8px;background:var(--accent-soft);border-radius:4px;color:var(--accent);vertical-align:middle;white-space:nowrap}
.links{display:flex;flex-wrap:wrap;gap:4px 16px} .links a{font-size:13.5px;white-space:nowrap;border-bottom:1px dotted color-mix(in srgb,var(--accent) 50%,transparent)} .links a:hover{text-decoration:none;border-bottom-style:solid}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.linkbtn{font:inherit;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--accent);background:none;border:0;padding:0;cursor:pointer} .linkbtn:hover{text-decoration:underline;text-underline-offset:4px}
.h2m{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.themeToggle{font:inherit;cursor:pointer;background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:999px;width:30px;height:30px;line-height:1;flex:none}
.themeToggle:hover{color:var(--ink);border-color:var(--muted)}

/* ---------- nav */
.nav{position:sticky;top:0;z-index:5;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--line)}
@supports not (background:color-mix(in srgb,red,blue)){.nav{background:var(--bg)}}
.nav .in{max-width:1040px;margin:0 auto;padding:12px 28px;display:flex;align-items:center;gap:22px;font-size:14px}
.nav .brand{font-weight:700;margin-right:auto;letter-spacing:-.01em;color:var(--ink);white-space:nowrap}
.nav nav{display:flex;gap:22px} .nav a{color:var(--muted)} .nav nav a.on{color:var(--ink);font-weight:600} .nav a.ext{color:var(--muted)}

/* ---------- hero */
.wrap{max-width:1040px;margin:0 auto;padding:0 28px}
.hero{display:grid;grid-template-columns:1fr 232px;gap:48px;align-items:center;padding:72px 0 52px;border-bottom:1px solid var(--line)}
.name{font-weight:800;letter-spacing:-.03em;line-height:1.02;margin:0;font-size:60px}
.hero .aff{font-size:15px;color:var(--muted);margin:14px 0 0} .hero .aff a{color:var(--ink);border-bottom:1px dotted var(--line)} .hero .aff a:hover{text-decoration:none;border-bottom-color:var(--ink)}
.hero .tag{font-size:22px;color:var(--ink);font-weight:500;margin:22px 0 18px;max-width:min(26ch,100%);line-height:1.3}
.hero .links{margin-bottom:16px}
.portrait{width:232px;height:232px;border-radius:16px;object-fit:cover;box-shadow:0 10px 40px rgba(0,0,0,.12);display:block}
.hero .cap{font-family:var(--mono);font-size:11px;color:var(--muted);text-align:center;margin-top:8px}

/* ---------- sections (ledger: label column | content) */
section.sec{display:grid;grid-template-columns:168px minmax(0,1fr);gap:36px;padding:44px 0;border-bottom:1px solid var(--line)}
section.sec>div{min-width:0}
section.sec.tight{padding:28px 0;border-bottom:0} section.sec.tight+section.sec.tight{padding-top:4px}
#cv{border-top:1px solid var(--line)}
.lab{position:sticky;top:64px;align-self:start}
.lab::before{content:"";display:block;width:26px;height:3px;background:var(--accent);border-radius:2px;margin-bottom:10px}
.lab h2{margin:0 0 4px;font-size:17px} .lab .sub{font-size:12px;color:var(--muted);font-family:var(--mono)}

/* ---------- research */
.research div{display:grid;grid-template-columns:210px 1fr 130px;gap:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.research b{font-weight:650} .research .pp{font-family:var(--mono);font-size:12px;color:var(--muted);text-align:right;padding-top:3px}

/* ---------- news */
.news li{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:7px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.news .d{font-family:var(--mono);font-size:12.5px;color:var(--muted);padding-top:3px}
.news li.more{display:block;border:0;padding-top:10px}
.news.collapsed li.extra{display:none}

/* ---------- publications */
.pub{display:grid;grid-template-columns:72px 1fr;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.pub>img{width:72px;height:72px;border-radius:9px;object-fit:cover;border:1px solid var(--line);background:var(--surface)}
.pub h3{margin:5px 0 4px;font-size:16px;line-height:1.35;font-weight:650}
.pub .au{font-size:13.5px;color:var(--muted)} .pub .au b{color:var(--ink);font-weight:650}
.pub .links{margin-top:4px}
details{margin-top:6px;font-size:14px}
summary{cursor:pointer;color:var(--muted);font-family:var(--mono);font-size:12px;letter-spacing:.04em;list-style:none;display:inline-block}
summary::-webkit-details-marker{display:none}
summary::before{content:"\25B8 "} details[open]>summary::before{content:"\25BE "}
details p{margin:8px 0 0;max-width:64ch;color:var(--ink)}
.pub .fig{display:block;max-width:640px;width:100%;height:auto;margin:12px 0 4px;border-radius:10px;border:1px solid var(--line);background:#fff;padding:6px}

/* ---------- cv rows */
.row{display:grid;grid-template-columns:118px 1fr;gap:14px;padding:9px 0;border-bottom:1px solid var(--line)}
.row.one{grid-template-columns:1fr}
.row.logo{grid-template-columns:118px 40px 1fr;gap:14px} .row .lg{width:40px;height:40px;border-radius:9px;border:1px solid var(--line);background:#fff;object-fit:contain;display:block;margin-top:1px}
.row .p{font-family:var(--mono);font-size:12.5px;color:var(--muted);padding-top:3px;white-space:nowrap}
.row .t{font-weight:600} .row .t.light{font-weight:500} .row .s{color:var(--muted);font-size:13.5px}
.row details.more{margin-top:2px;font-size:13.5px} .row details.more p{max-width:60ch;color:var(--muted)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:32px}

/* ---------- hero photo carousel (232px square, scroll-snap, arrows on hover) */
.hero-photo{width:232px}
.carousel{position:relative;min-width:0}
.carousel .track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;outline:none;border-radius:16px;box-shadow:0 10px 40px rgba(0,0,0,.12)}
.carousel .track::-webkit-scrollbar{display:none}
.carousel figure{margin:0;flex:0 0 100%;scroll-snap-align:start;aspect-ratio:1/1;overflow:hidden;background:var(--surface)}
.carousel figure img{width:100%;height:100%;object-fit:cover;display:block}
.carousel .arrow{position:absolute;top:50%;transform:translateY(-50%);width:30px;height:30px;border-radius:50%;border:1px solid var(--line);background:var(--bg);color:var(--ink);font-size:18px;line-height:1;cursor:pointer;opacity:0;transition:opacity .15s;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.carousel:hover .arrow,.carousel:focus-within .arrow{opacity:.92} .carousel .arrow:hover{opacity:1} .carousel .prev{left:8px} .carousel .next{right:8px}
.carousel .dots{display:flex;gap:6px;justify-content:center;margin-top:9px}
.carousel .dots button{width:6px;height:6px;border-radius:50%;border:0;padding:0;background:var(--line);cursor:pointer}
.carousel .dots button.on{background:var(--accent)}

/* ---------- home: latest talks / seminars (rows with a slide thumbnail) */
.decklist .deck{display:grid;grid-template-columns:120px minmax(0,1fr);gap:16px;padding:12px 0;border-bottom:1px dashed var(--line);color:inherit}
.decklist .deck:hover{text-decoration:none} .decklist .deck:hover .t{text-decoration:underline}
.decklist .deck>span{display:block;min-width:0}
.decklist .deck .thumb{aspect-ratio:16/9;overflow:hidden;border-radius:8px;border:1px solid var(--line);background:var(--surface)}
.decklist .deck .thumb img{width:100%;height:100%;object-fit:cover;object-position:top;display:block}
.decklist .deck .meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.decklist .deck .t{font-weight:600;font-size:15px;line-height:1.35;margin-top:5px;color:var(--ink)}
.decklist .deck .x{color:var(--muted);font-size:13px;margin-top:3px}

/* ---------- recent posts */
.postlist .post{display:grid;grid-template-columns:96px 1fr;gap:14px;padding:9px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.postlist .post .d{font-family:var(--mono);font-size:12.5px;color:var(--muted);padding-top:3px}
.postlist .post .x{color:var(--muted);font-size:13px;margin-top:2px}
.posts-page .post{padding:16px 0;font-size:16px} .posts-page .post .t{font-weight:600} .posts-page .post .x{font-size:14px;margin-top:4px;max-width:72ch}

/* ---------- footer */
footer{color:var(--muted);font-size:13px;padding:28px 0 40px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--line)}

/* ---------- responsive */
@media(max-width:860px){
  .hero{grid-template-columns:1fr;gap:24px;padding:44px 0 36px} .hero>div:last-child{order:-1} .portrait{width:140px;height:140px} .hero-photo{width:140px} .carousel .track{border-radius:12px} .hero .cap{text-align:left} .carousel .dots{justify-content:flex-start}
  .name{font-size:42px} .hero .tag{font-size:20px} section.sec{grid-template-columns:1fr;gap:12px;padding:32px 0} .lab{position:static}
  .nav .in{gap:12px;padding:10px 16px} .nav nav{gap:14px;flex:1;min-width:0;overflow-x:auto;white-space:nowrap;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 85%,transparent)} .nav nav::-webkit-scrollbar{display:none} .nav .brand{margin-right:0;font-size:14px} .wrap{padding:0 20px}
  .carousel .prev{left:6px} .carousel .next{right:6px}
}
@media(max-width:720px){.row.logo{grid-template-columns:40px 1fr} .row.logo .p{grid-column:1/-1;padding-top:0} 
  .two{grid-template-columns:1fr;gap:18px} .research div{grid-template-columns:1fr;gap:4px} .research .pp{text-align:left}
  .row{grid-template-columns:1fr;gap:2px} .news li{grid-template-columns:1fr;gap:2px} .pub{grid-template-columns:56px 1fr;gap:12px} .pub>img{width:56px;height:56px}
  .postlist .post{grid-template-columns:1fr;gap:2px}
}
/* ---------- talks (talks/ and talks/<key>/) */
.hero.one{grid-template-columns:1fr;padding:56px 0 36px} .name.sm{font-size:44px}
.talks .talk{display:grid;grid-template-columns:200px minmax(0,1fr);gap:22px;padding:22px 0;border-bottom:1px solid var(--line)}
.talk .thumb{display:block;aspect-ratio:16/9;overflow:hidden;border-radius:10px;border:1px solid var(--line);background:var(--surface)}
.talk .thumb img{width:100%;height:100%;object-fit:cover;object-position:top;display:block}
.talk .meta,.talkhead .meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.talk h3{margin:6px 0 4px;font-size:17px;line-height:1.35;font-weight:650} .talk h3 a{color:var(--ink)}
.talk .x,.talkhead .x{color:var(--muted);font-size:14px;margin:4px 0 8px;max-width:72ch} .talk .au,.talkhead .au{font-size:13.5px;color:var(--muted);margin-bottom:6px} .talk .au b,.talkhead .au b{color:var(--ink);font-weight:650}
.talkhead{padding:40px 0 22px;border-bottom:1px solid var(--line)}
.talkhead h1{font-size:28px;letter-spacing:-.02em;line-height:1.25;margin:8px 0 6px} .talkhead .meta{margin:8px 0 12px}
.viewer{padding:24px 0 4px} .viewer .stage{position:relative;min-width:0}
.viewer .track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;outline:none;border-radius:12px;border:1px solid var(--line);background:#fff;box-shadow:0 10px 40px rgba(0,0,0,.10)}
.viewer .track::-webkit-scrollbar{display:none}
.viewer figure{margin:0;flex:0 0 100%;scroll-snap-align:start;aspect-ratio:16/9} .viewer figure img{width:100%;height:100%;object-fit:contain;display:block}
.viewer figure iframe{width:100%;height:100%;border:0;display:block;background:#0a0e1a;pointer-events:none}   /* html decks: the slide page itself; pointer-events off so keys/swipes stay with the viewer */
.viewer .arrow{position:absolute;top:50%;transform:translateY(-50%);width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:var(--bg);color:var(--ink);font-size:20px;line-height:1;cursor:pointer;opacity:.85;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.viewer .arrow:hover{opacity:1} .viewer .prev{left:10px} .viewer .next{right:10px}
.viewer .bar{display:flex;gap:16px;align-items:center;margin:10px 0 6px;font-size:12px;color:var(--muted)} .viewer .count b{color:var(--ink)} .viewer .hint{margin-left:auto}
.viewer .rail{display:flex;gap:8px;overflow-x:auto;padding:6px 2px 10px;scrollbar-width:thin;scroll-behavior:smooth}
.viewer .rail button{flex:0 0 112px;padding:0;border:2px solid transparent;border-radius:7px;background:none;cursor:pointer;opacity:.65}
.viewer .rail button img{width:100%;height:auto;display:block;border-radius:4px;border:1px solid var(--line);background:#fff} .viewer .rail button.on{border-color:var(--accent);opacity:1} .viewer .rail button:hover{opacity:1}
.viewer .track:fullscreen{border:0;border-radius:0;background:#000} .viewer .track:fullscreen figure{aspect-ratio:auto;height:100vh;display:flex;align-items:center;justify-content:center} .viewer .track:fullscreen figure img{max-height:100vh} .viewer .track:fullscreen figure iframe{width:min(100vw,177.78vh);height:min(100vh,56.25vw)}
.poster{padding:28px 0 4px} .poster img{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:10px;background:#fff} .poster .mono{margin-top:8px;text-transform:none;letter-spacing:0}
.backlink{padding:24px 0 8px}
@media(max-width:720px){.decklist .deck{grid-template-columns:96px 1fr;gap:12px} .talks .talk{grid-template-columns:1fr;gap:10px} .talk .thumb{max-width:320px} .viewer .hint{display:none} .viewer .rail button{flex-basis:88px} .talkhead h1{font-size:23px} .name.sm{font-size:36px}}

@media print{.nav,.themeToggle,.carousel .arrow,.carousel .dots,.viewer .arrow,.viewer .bar{display:none} body{background:#fff;color:#000} .lab{position:static}}