/* 기본 리셋 */
:root{padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
body{margin:0}
img{max-width:100%}
[hidden]{display:none!important}

/* Layout: 밝은 단일 테마. Hero(주장 + 측정 기록) → About → Timeline(연도 세로축) → Projects(카드 그리드, 클릭 시 모달) → Contact. 좌측 정렬 */
:root{
  --bg:#FFFFFF;
  --tint:#F4F7FC;
  --line:#DFE6F0;
  --ink:#16202E;
  --muted:#5A6678;
  --blue:#2E6BE6;
  --blue-soft:#E7EFFD;
  --drop:#8C96A5;
  --drop-soft:#EEF1F5;
  --amber:#8F5B00;
  --amber-soft:#FFF3D9;
  --f-head:"Gothic A1","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --f-body:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:1rem;line-height:1.7;word-break:keep-all;overflow-wrap:break-word;-webkit-font-smoothing:antialiased}
.wrap{max-width:1140px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3,h4,h5{font-family:var(--f-head);font-weight:800;line-height:1.3;text-wrap:balance;margin:0;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding-left:1.1em}
li+li{margin-top:.3em}
a{color:var(--blue)}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:3px}

/* nav */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:31;background:var(--bg)}
.bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:30;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:56px}
.bar strong{font-family:var(--f-head);font-weight:800;font-size:1.0625rem}
.bar nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.bar nav a{color:var(--muted);text-decoration:none;font-size:.875rem;padding:6px 12px;border-radius:999px;white-space:nowrap}
.bar nav a:hover{background:var(--tint);color:var(--ink)}

section{scroll-margin-top:56px}
.sec-head{display:grid;gap:10px;margin-bottom:36px;max-width:44em}
.sec-head h2{font-size:clamp(1.75rem,3.4vw,2.375rem)}
.sec-head p{color:var(--muted)}
.pad{padding-block:88px}

/* hero */
.hero{background:linear-gradient(180deg,var(--tint),var(--bg) 85%)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:56px;padding-block:80px 72px;align-items:start}
.who{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-block;font-size:.8125rem;font-weight:500;padding:4px 12px;border-radius:999px;background:var(--bg);border:1px solid var(--line);color:var(--muted)}
.chip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.thesis{font-size:clamp(2.1rem,4.6vw,3.5rem);line-height:1.22;margin:22px 0 24px;font-weight:700}
.thesis strong{color:var(--blue);font-weight:800}
.thesis em{font-style:normal;color:var(--ink)}
.lead{color:var(--muted);font-size:1.0625rem;max-width:32em}
.hero-cta{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-size:.9375rem;font-weight:600;padding:11px 20px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);text-decoration:none;cursor:pointer}
.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn:hover{border-color:var(--blue)}

.log{background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:22px 22px 8px;box-shadow:0 10px 30px -18px rgba(46,107,230,.35)}
.log h2{font-size:1.0625rem}
.log .sub{font-size:.8125rem;color:var(--muted);margin:2px 0 10px}
.log ol{list-style:none;padding:0;margin:0}
.log li{margin:0;border-top:1px solid var(--line)}
.log button{all:unset;box-sizing:border-box;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:0 14px;width:100%;padding:11px 4px;cursor:pointer;border-radius:8px}
.log button:hover{background:var(--tint)}
.log button:focus-visible{outline:2px solid var(--blue)}
.log .n{font-weight:600;font-size:.9375rem}
.log .v{font-family:var(--f-head);font-weight:800;font-size:1.3rem;color:var(--blue);text-align:right;font-variant-numeric:tabular-nums;line-height:1.2}
.log .k{grid-column:1/-1;font-size:.8125rem;color:var(--muted);line-height:1.5}

/* about */
.about-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:start}
.about-text{display:grid;gap:16px;font-size:1.0625rem}
.about-text p{color:var(--muted)}
.about-text b{color:var(--ink);font-weight:600}
.facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.fact{background:var(--tint);border-radius:12px;padding:16px}
.fact b{display:block;font-family:var(--f-head);font-weight:800;font-size:1.75rem;color:var(--blue);line-height:1.15;font-variant-numeric:tabular-nums}
.fact span{font-size:.8125rem;color:var(--muted)}
.sub-h{font-size:1.25rem;margin:64px 0 18px}
.principles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.pr{border:1px solid var(--line);border-radius:14px;padding:22px;display:grid;gap:12px;align-content:start}
.pr .num{width:32px;height:32px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-family:var(--f-head);font-weight:800}
.pr h4{font-size:1.0625rem}
.pr ul{font-size:.9rem;color:var(--muted)}
.pr ul b{color:var(--ink);font-weight:600}
.caps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 32px}
.cap{padding:14px 0;border-top:1px solid var(--line);display:grid;gap:4px}
.cap b{font-weight:600}
.cap span{color:var(--muted);font-size:.9rem}
.stack{display:grid;grid-template-columns:max-content minmax(0,1fr);margin:0}
.stack dt,.stack dd{margin:0;padding:12px 0;border-top:1px solid var(--line)}
.stack dt{font-weight:600;padding-right:32px}
.stack dd{color:var(--muted)}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tags span{font-size:.8125rem;padding:3px 10px;border-radius:6px;background:var(--tint);color:var(--ink)}

/* timeline */
.tl-band{background:var(--tint)}
.tl{list-style:none;margin:0;padding:0;position:relative}
.tl::before{content:"";position:absolute;left:111px;top:8px;bottom:8px;width:2px;background:var(--line)}
.tl > li{display:grid;grid-template-columns:96px minmax(0,1fr);gap:32px;margin:0 0 28px;position:relative}
.tl > li::before{content:"";position:absolute;left:105px;top:10px;width:14px;height:14px;border-radius:50%;background:var(--bg);border:3px solid var(--blue)}
.tl .when{font-family:var(--f-head);font-weight:800;font-size:1.0625rem;text-align:right;padding-top:2px;font-variant-numeric:tabular-nums}
.tl .when small{display:block;font-family:var(--f-body);font-weight:500;font-size:.75rem;color:var(--muted)}
.tl .box{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:18px 22px;display:grid;gap:10px}
.tl .box h3{font-size:1.0625rem}
.tl .box > p{color:var(--muted);font-size:.9375rem}
.tl .items{list-style:none;padding:0;display:grid;gap:6px}
.tl .items li{margin:0;display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline;font-size:.9375rem}
.tl .items .d{font-size:.8125rem;color:var(--muted);font-variant-numeric:tabular-nums;min-width:4.5em}
.tl .items button{all:unset;cursor:pointer;color:var(--blue);font-weight:500;text-decoration:underline;text-decoration-color:rgba(46,107,230,.35);text-underline-offset:3px}
.tl .items button:hover{text-decoration-color:var(--blue)}
.tl .items button:focus-visible{outline:2px solid var(--blue)}
.tl .note{font-size:.75rem;color:var(--amber)}

/* projects */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.filters button{font:inherit;font-size:.875rem;padding:8px 16px;border-radius:999px;border:1px solid var(--line);background:var(--bg);color:var(--ink);cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--blue);color:#fff;border-color:var(--blue)}
.filters .c{margin-left:6px;opacity:.6;font-variant-numeric:tabular-nums}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.card{all:unset;box-sizing:border-box;cursor:pointer;display:grid;grid-template-rows:auto auto 1fr auto;gap:10px;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:20px 20px 18px;transition:border-color .15s,box-shadow .15s,transform .15s}
.card:hover{border-color:var(--blue);box-shadow:0 12px 28px -18px rgba(46,107,230,.45);transform:translateY(-2px)}
.card:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.card .top{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.75rem;color:var(--muted)}
.card .no{font-family:var(--f-head);font-weight:800;color:var(--ink);font-size:.875rem}
.tag{display:inline-block;font-size:.72rem;line-height:1.5;padding:1px 8px;border-radius:5px;background:var(--amber-soft);color:var(--amber);font-weight:600}
.card h3{font-size:1.0625rem;line-height:1.4}
.card .sum{font-size:.875rem;line-height:1.65;color:var(--muted)}
.card .metric{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;border-top:1px solid var(--line);padding-top:12px}
.card .metric b{font-family:var(--f-head);font-weight:800;font-size:1.25rem;color:var(--blue);line-height:1.2;font-variant-numeric:tabular-nums}
.card .metric span{font-size:.75rem;color:var(--muted);text-align:right;max-width:60%;line-height:1.4}
.card .basis{display:block;border-top:1px solid var(--line);padding-top:10px;font-size:.75rem;line-height:1.45;color:var(--muted);text-align:right}
.card.hide{display:none}

/* modal */
dialog{border:0;padding:0;border-radius:18px;width:min(960px,calc(100vw - 32px));max-height:calc(100dvh - 48px);color:var(--ink);background:var(--bg);box-shadow:0 30px 80px -20px rgba(22,32,46,.45);overflow:hidden}
dialog::backdrop{background:rgba(22,32,46,.42);backdrop-filter:blur(2px)}
dialog[open]{display:flex;flex-direction:column;animation:pop .18s ease-out}
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.99)}to{opacity:1;transform:none}}
.m-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding:22px 26px 18px;border-bottom:1px solid var(--line)}
.m-head .top{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.8125rem;color:var(--muted);margin-bottom:6px}
.m-head .no{font-family:var(--f-head);font-weight:800;color:var(--blue)}
.m-head h2{font-size:clamp(1.25rem,2.6vw,1.625rem)}
.m-head .ctx{color:var(--muted);font-size:.875rem;margin-top:4px}
.m-x{flex:none;font:inherit;font-size:1.25rem;width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--bg);cursor:pointer;color:var(--ink)}
.m-x:hover{background:var(--tint)}
.m-body{overflow-y:auto;padding:24px 26px 28px;display:grid;grid-template-columns:minmax(0,1fr);gap:28px;overscroll-behavior:contain}
.m-foot{display:flex;justify-content:space-between;gap:8px;padding:12px 26px;border-top:1px solid var(--line);background:var(--tint)}
.m-foot button{font:inherit;font-size:.875rem;font-weight:500;padding:8px 14px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--ink);cursor:pointer;max-width:48%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.m-foot button:hover{border-color:var(--blue)}
.m-foot button:disabled{opacity:.4;cursor:default}

.readout{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.ro{display:grid;gap:2px;align-content:start;padding:14px 16px;border-radius:12px}
.ro .lab{font-size:.72rem;font-weight:700;color:var(--blue)}
.ro.keep{background:var(--blue-soft)}
.ro.keep .rv{color:var(--blue)}
.ro.drop{background:repeating-linear-gradient(135deg,var(--drop-soft) 0 6px,var(--bg) 6px 9px);border:1px solid var(--line)}
.ro.drop .lab{color:var(--drop)}
.ro.drop .rv{color:var(--drop);text-decoration:line-through;text-decoration-thickness:1.5px}
.ro .rk{font-size:.875rem;font-weight:600}
.ro .rv{font-family:var(--f-head);font-weight:800;font-size:1.375rem;line-height:1.25;font-variant-numeric:tabular-nums}
.ro .rn{font-size:.8125rem;color:var(--muted);line-height:1.5}
.m-sum{font-size:.9375rem}
.m-sum b{font-weight:600}
.meta{display:grid;grid-template-columns:max-content minmax(0,1fr);margin:0;font-size:.9rem}
.meta dt,.meta dd{margin:0;padding:9px 0;border-top:1px solid var(--line)}
.meta dt{color:var(--muted);padding-right:24px;font-weight:500}
.hyp{background:var(--tint);border-radius:12px;padding:16px 18px}
.blk{display:grid;grid-template-columns:minmax(0,1fr);gap:10px;min-width:0}
.blk h4,.hyp h4{font-size:1.0625rem;display:flex;align-items:center;gap:8px;margin-bottom:2px}
.blk h4 .l{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;background:var(--blue);color:#fff;font-size:.8125rem}
.blk ul,.hyp ul{font-size:.9375rem}
.blk h5{font-size:.9375rem;font-family:var(--f-body);font-weight:600;margin-top:8px}
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:10px}
.tbl table{border-collapse:collapse;width:100%;min-width:560px;font-size:.875rem}
.tbl th,.tbl td{padding:10px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.tbl th{font-weight:600;color:var(--muted);background:var(--tint)}
.tbl tr:last-child td{border-bottom:0}
.tbl tr.adopt td{background:var(--blue-soft)}
.tbl tr.adopt td:last-child{color:var(--blue);font-weight:600}
.tbl td:first-child{font-weight:500;width:28%}
.tbl.kv td:first-child{width:22%;color:var(--muted)}
.two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.two > *{min-width:0}
.figs{display:grid;gap:18px}
figure{margin:0}
figure img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:10px;padding:8px;background:#fff}
figcaption{font-size:.8125rem;color:var(--muted);margin-top:6px}

.papers{display:grid;gap:0}
.paper{display:grid;grid-template-columns:minmax(0,1.4fr) 10em minmax(0,1.2fr);gap:20px;padding:14px 0;border-top:1px solid var(--line);align-items:baseline}
.paper h4{font-size:.9875rem;font-family:var(--f-body);font-weight:600}
.paper .venue{font-size:.875rem}
.paper .venue b{display:inline-block;margin-right:6px;font-size:.72rem;padding:1px 7px;border-radius:5px;background:var(--blue-soft);color:var(--blue)}
.paper p{font-size:.875rem;color:var(--muted)}
@media (max-width:760px){.paper{grid-template-columns:minmax(0,1fr);gap:4px}}
/* contact */
.contact{background:var(--ink);color:#F2F5FA}
.contact .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;padding-block:88px}
.contact h2{font-size:clamp(1.75rem,3.4vw,2.375rem)}
.contact p{color:#AEB8C7;margin-top:14px;max-width:30em}
.cl{display:grid;gap:12px;align-content:start}
.cl > div{display:grid;grid-template-columns:5em minmax(0,1fr) auto;gap:12px;align-items:center;padding:16px 18px;border-radius:12px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1)}
.cl .k{color:#AEB8C7;font-size:.8125rem}
.cl .val{font-size:1.0625rem;font-weight:500;overflow-wrap:anywhere;user-select:all}
.cl .val a{color:#F2F5FA}
.cl button{font:inherit;font-size:.8125rem;font-weight:600;padding:7px 12px;border:0;background:var(--blue);color:#fff;border-radius:8px;cursor:pointer}
.cl .go{font-size:.8125rem;font-weight:600;padding:7px 12px;background:rgba(255,255,255,.12);color:#fff;border-radius:8px;text-decoration:none}
.cl .go:hover{background:rgba(255,255,255,.2)}
.foot{color:#7E8A9C;font-size:.8125rem;padding-block:0 40px}

@media (max-width:960px){
  .hero .wrap,.about-grid,.contact .wrap{grid-template-columns:minmax(0,1fr);gap:36px}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .principles,.caps{grid-template-columns:minmax(0,1fr)}
  .principles{gap:12px}
}
@media (max-width:640px){
  .pad{padding-block:60px}
  .hero .wrap{padding-block:48px}
  .bar nav{display:none}
  .grid,.two{grid-template-columns:minmax(0,1fr)}
  .facts{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
  .fact{padding:12px}
  .fact b{font-size:1.375rem}
  .stack,.meta{grid-template-columns:minmax(0,1fr)}
  .stack dd,.meta dd{border-top:0;padding-top:0}
  .tl::before{left:7px}
  .tl > li{grid-template-columns:minmax(0,1fr);gap:8px;padding-left:28px}
  .tl > li::before{left:1px;top:4px}
  .tl .when{text-align:left}
  .tl .when small{display:inline;margin-left:8px}
  dialog{width:100vw;max-width:100vw;max-height:100dvh;height:100dvh;border-radius:0}
  .m-head{padding:calc(16px + env(safe-area-inset-top,0px)) 18px 14px}
  .m-body{padding:18px}
  .m-foot{padding:10px 18px calc(10px + env(safe-area-inset-bottom,0px))}
  .cl > div{grid-template-columns:minmax(0,1fr) auto}
  .cl .k{grid-column:1/-1}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}