/* ==========================================================================
   Jun Hyeong Kim — personal site
   Ledger layout. One accent. Three type roles.
     Archivo        구조 (이름, 네비, 목록 본문)
     Newsreader     읽는 글 (소개문, 논문 제목)
     IBM Plex Mono  데이터 (날짜, 학회명, 라벨)
   ========================================================================== */

:root{
  --paper:#FCFCFA;
  --ink:#15171A;
  --muted:#5E6A6B;
  --rule:#E2E5E1;
  --accent:#0E5A55;
  --accent-wash:#EAF1EF;

  --sans:"Archivo",ui-sans-serif,system-ui,"Helvetica Neue",Arial,sans-serif;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --label-col:8.75rem;
  --gutter:1.75rem;
  --rail:1.65rem;
  --shell:66rem;
  --aside:12.5rem;
  --bar-h:3.25rem;
  color-scheme:light;
}

:root[data-theme="dark"]{
    --paper:#111413;
    --ink:#ECEEE9;
    --muted:#98A3A1;
    --rule:#262B29;
    --accent:#74C6B7;
    --accent-wash:#16211F;
  color-scheme:dark;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;height:auto}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- top bar ---------- */
.bar{
  position:sticky;top:0;z-index:20;
  background:var(--paper);
  border-bottom:1px solid var(--rule);
}
@supports (backdrop-filter:blur(8px)){
  .bar{background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(8px)}
}
.bar__in{
  max-width:var(--shell);margin:0 auto;padding:0 1.5rem;
  height:var(--bar-h);display:flex;align-items:center;gap:1.5rem;
}
.bar__name{
  display:none;
  font-weight:600;font-size:.82rem;letter-spacing:-.01em;
  white-space:nowrap;text-decoration:none;
}
.bar__nav{display:flex;gap:1.1rem;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.bar__nav::-webkit-scrollbar{display:none}
.bar__nav a{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.09em;text-transform:uppercase;
  color:var(--muted);text-decoration:none;white-space:nowrap;
  padding:.15rem 0;border-bottom:1.5px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.bar__nav a:hover{color:var(--ink)}
.bar__nav a[aria-current="true"]{color:var(--accent);border-bottom-color:var(--accent)}

.theme{
  flex:none;background:none;border:1px solid var(--rule);border-radius:2px;
  width:1.85rem;height:1.85rem;padding:0;cursor:pointer;color:var(--muted);
  display:inline-flex;align-items:center;justify-content:center;
  transition:border-color .18s ease,color .18s ease;
}
.theme:hover{border-color:var(--accent);color:var(--accent)}
.theme svg{width:.95rem;height:.95rem;display:block}
:root[data-theme="dark"] .theme .i-moon{display:none}
:root:not([data-theme="dark"]) .theme .i-sun{display:none}

/* ---------- shell ---------- */
.shell{max-width:var(--shell);margin:0 auto;padding:0 1.5rem}

/* ---------- two-column layout ---------- */
.layout{
  display:grid;grid-template-columns:var(--aside) 1fr;
  gap:0 3.5rem;padding-top:3.5rem;align-items:start;
}
.content{min-width:0}

/* ---------- profile (left column) ---------- */
.profile{
  position:sticky;top:calc(var(--bar-h) + 2.25rem);
  display:flex;flex-direction:column;align-items:flex-start;
}
.profile__photo{
  width:100%;max-width:9.5rem;aspect-ratio:1;
  border-radius:2px;object-fit:cover;border:1px solid var(--rule);
  margin-bottom:1.15rem;
}
.profile__role{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.11em;text-transform:uppercase;
  color:var(--accent);margin:0 0 .3rem;
}
.profile__name{
  font-weight:700;font-size:1.5rem;line-height:1.15;letter-spacing:-.022em;
  margin:0 0 1.1rem;text-wrap:balance;
}
.profile__links{
  display:flex;flex-direction:column;align-items:stretch;
  width:100%;border-top:1px solid var(--rule);
}
.profile__links a{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;
  text-decoration:none;color:var(--muted);
  padding:.42rem 0;border-bottom:1px solid var(--rule);
  transition:color .18s ease,padding-left .18s ease;
}
.profile__links a:hover{color:var(--accent);padding-left:.35rem}

/* ---------- intro prose (about.md 본문) ---------- */
.intro{max-width:62ch;padding-bottom:2.75rem}
.intro p{
  font-family:var(--serif);font-size:1.075rem;line-height:1.62;
  margin:0 0 1rem;text-wrap:pretty;
}
.intro p:last-child{margin-bottom:0}
.intro a{color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent-wash)}
.intro a:hover{border-bottom-color:var(--accent)}

/* ---------- ledger + path rail ---------- */
.ledger{position:relative;padding-left:var(--rail);padding-bottom:4rem}
.ledger::before{
  content:"";position:absolute;left:0;top:.55rem;bottom:2.5rem;
  width:1px;background:var(--rule);
}
.ledger__ink{
  position:absolute;left:0;top:.55rem;width:1px;height:0;
  background:var(--accent);transition:height .1s linear;
}

.sec{padding:2.6rem 0 0;scroll-margin-top:4.5rem}
.sec:first-of-type{padding-top:.5rem}
.sec__head{position:relative;margin:0 0 1.5rem}
.sec__head::before{
  content:"";position:absolute;left:calc(-1 * var(--rail));top:.42rem;
  width:7px;height:7px;border-radius:50%;
  background:var(--paper);border:1.5px solid var(--rule);
  transform:translateX(-3px);
  transition:background .25s ease,border-color .25s ease;
}
.sec[data-seen="true"] .sec__head::before{background:var(--accent);border-color:var(--accent)}
.sec__title{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);font-weight:500;margin:0;
}

/* ---------- ledger rows ---------- */
.row{
  display:grid;grid-template-columns:var(--label-col) 1fr;gap:0 var(--gutter);
  padding:.72rem 0;border-top:1px solid var(--rule);align-items:baseline;
}
.sec > .row:first-of-type{border-top:0;padding-top:0}
.row__label{
  font-family:var(--mono);font-size:.71rem;letter-spacing:.02em;
  color:var(--muted);font-variant-numeric:tabular-nums;padding-top:.18rem;
}
.row__label b{display:block;color:var(--accent);font-weight:500}
.row__body{min-width:0}
.row__title{
  font-family:var(--serif);font-size:1.06rem;line-height:1.4;
  margin:0 0 .22rem;text-wrap:pretty;
}
.row__title a{text-decoration:none;border-bottom:1px solid var(--rule);transition:border-color .18s ease,color .18s ease}
.row__title a:hover{border-bottom-color:var(--accent);color:var(--accent)}
.row__meta{font-size:.87rem;color:var(--muted);margin:0}
.row__meta .me{color:var(--ink);font-weight:600}
.row__text{font-size:.94rem;margin:0}
.row__text a{color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent-wash)}
.row__text a:hover{border-bottom-color:var(--accent)}
.row__note{color:var(--muted)}
.row__sub{margin:.4rem 0 0;padding:0;list-style:none;display:flex;flex-direction:column;gap:.15rem}
.row__sub li{font-size:.85rem;color:var(--muted);padding-left:.85rem;position:relative}
.row__sub li::before{content:"";position:absolute;left:0;top:.62em;width:4px;height:1px;background:var(--muted)}
.out{
  display:inline-flex;align-items:center;gap:.28rem;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.04em;
  color:var(--muted);text-decoration:none;margin-top:.4rem;
  border-bottom:1px solid transparent;
}
.out:hover{color:var(--accent);border-bottom-color:var(--accent)}
.out + .out{margin-left:.9rem}

/* ---------- news toggle ---------- */
.more{
  margin-top:.9rem;background:none;border:0;cursor:pointer;padding:.3rem 0;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent);display:inline-flex;align-items:center;gap:.4rem;
}
.more:hover{text-decoration:underline;text-underline-offset:3px}
.more__chev{transition:transform .2s ease;display:inline-block}
.more[aria-expanded="true"] .more__chev{transform:rotate(180deg)}

/* ---------- footer ---------- */
.foot{
  border-top:1px solid var(--rule);padding:1.6rem 0 3rem;
  display:flex;flex-wrap:wrap;gap:.6rem 1.5rem;align-items:baseline;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.04em;color:var(--muted);
}
.foot a{color:var(--accent);text-decoration:none}
.foot a:hover{text-decoration:underline;text-underline-offset:3px}
.foot__end{margin-left:auto}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .bar__name{display:block}
  .layout{grid-template-columns:1fr;gap:2.25rem;padding-top:2.5rem}
  .profile{position:static;flex-direction:row;flex-wrap:wrap;align-items:center;gap:0 1.25rem}
  .profile__photo{width:6.25rem;margin-bottom:0}
  .profile__links{width:auto;border-top:0;flex-direction:row;flex-wrap:wrap;gap:.45rem;margin-top:.9rem}
  .profile__links a{border-bottom:0;border:1px solid var(--rule);border-radius:2px;padding:.34rem .65rem}
  .profile__links a:hover{padding-left:.65rem}
}

@media (max-width:640px){
  :root{--label-col:100%;--rail:1.15rem}
  .row{grid-template-columns:1fr;gap:.3rem}
  .row__label{padding-top:0}
  .row__label b{display:inline;margin-left:.5rem}
  .foot__end{margin-left:0}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}

/* ---------- print ---------- */
@media print{
  .bar,.more{display:none}
  .ledger{padding-left:0}
  .ledger::before,.ledger__ink,.sec__head::before{display:none}
  body{font-size:11pt}
}