/* ==========================================================================
   BILAB — Business Intelligence Lab, Myongji University
   ========================================================================== */

:root{
  /* "Deep Signal" palette */
  --navy:#0E2038;
  --navy2:#163863;
  --accent:#3454D1;
  --accent-d:#2A3EA0;
  --teal:#12A594;
  --spark:#E8590C;
  --spark-bg:#FDE6D8;
  --ink:#1B2531;
  --muted:#5E6B7E;
  /* --dim carries real information (paper authors, join dates, table
     headers), so it has to clear WCAG AA: the old #98A2B3 was 2.6:1 on
     white. --dim-deco keeps that lighter value for genuinely decorative
     marks that carry no text meaning. */
  --dim:#66707F;
  --dim-deco:#98A2B3;
  --line:#E6EAF1;
  /* text-on-tint pairs — the tint alone never carries meaning */
  --spark-ink:#9A3412;
  --ok-bg:#E6F7F1;
  --ok-ink:#0A6E53;
  /* per-person chip palette (see js/main.js chipIndex) */
  --chip0-bg:#E9EEF6; --chip0-ink:#234AAD;
  --chip1-bg:#E6F7F1; --chip1-ink:#0A6E53;
  --chip2-bg:#FFF3D6; --chip2-ink:#946200;
  --chip3-bg:#F1EAFB; --chip3-ink:#6B3FA0;
  --chip4-bg:#FDE9EE; --chip4-ink:#B23A5C;
  --soft:#F4F7FB;
  --soft2:#E9EEF6;
  --bg:#ffffff;
  --card:#ffffff;
  --header-bg:rgba(255,255,255,.82);
  --glass:rgba(255,255,255,.68);
  --glass-border:rgba(255,255,255,.5);
  --icon:#0E2038;
  --font:'Pretendard', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;
  --shadow:0 18px 44px rgba(14,32,56,.10);
  --radius:14px;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --navy:#0A1830; --navy2:#142E54; --accent:#6E86E8; --accent-d:#93A6F2;
    --teal:#3FCFC6; --spark:#FF8A4C; --spark-bg:#3A2415; --ink:#E7ECF7; --muted:#A9B4C9; --dim:#7C879C; --line:#233251;
    --soft:#111F38; --soft2:#16294A; --bg:#0A1729; --card:#101F38;
    --header-bg:rgba(10,23,41,.78); --glass:rgba(16,31,56,.62); --glass-border:rgba(255,255,255,.08); --icon:#E7ECF7;
    --shadow:0 18px 44px rgba(0,0,0,.35);
    --dim-deco:#5C6780; --spark-ink:#FF8A4C;
    --ok-bg:#12362F; --ok-ink:#5FD9BE;
    --chip0-bg:#1B2F55; --chip0-ink:#A8C0FF;
    --chip1-bg:#12362F; --chip1-ink:#5FD9BE;
    --chip2-bg:#3A2E12; --chip2-ink:#E8C766;
    --chip3-bg:#2C2148; --chip3-ink:#C6A8F0;
    --chip4-bg:#3A1F2A; --chip4-ink:#F0A0B6;
  }
}
:root[data-theme="dark"]{
  --navy:#0A1830; --navy2:#142E54; --accent:#6E86E8; --accent-d:#93A6F2;
  --teal:#3FCFC6; --spark:#FF8A4C; --spark-bg:#3A2415; --ink:#E7ECF7; --muted:#A9B4C9; --dim:#7C879C; --line:#233251;
  --soft:#111F38; --soft2:#16294A; --bg:#0A1729; --card:#101F38;
  --header-bg:rgba(10,23,41,.78); --glass:rgba(16,31,56,.62); --glass-border:rgba(255,255,255,.08); --icon:#E7ECF7;
  --shadow:0 18px 44px rgba(0,0,0,.35);
  --dim-deco:#5C6780; --spark-ink:#FF8A4C;
  --ok-bg:#12362F; --ok-ink:#5FD9BE;
  --chip0-bg:#1B2F55; --chip0-ink:#A8C0FF;
  --chip1-bg:#12362F; --chip1-ink:#5FD9BE;
  --chip2-bg:#3A2E12; --chip2-ink:#E8C766;
  --chip3-bg:#2C2148; --chip3-ink:#C6A8F0;
  --chip4-bg:#3A1F2A; --chip4-ink:#F0A0B6;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:120px}
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} }

/* ============ PAGE TRANSITIONS ============ */
/* Cross-document view transition between the site's own .html pages —
   pure CSS, no JS. Unsupported browsers (no @view-transition support)
   just navigate as before; this is additive only. */
@view-transition{
  navigation:auto;
}
::view-transition-old(root),
::view-transition-new(root){
  animation-duration:.22s;
  animation-timing-function:ease;
}
@media (prefers-reduced-motion:reduce){
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*){
    animation:none !important;
  }
}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
::selection{background:var(--accent);color:#fff}

.wrap{max-width:1180px;margin:0 auto;padding:0 28px}

.eyebrow{
  display:inline-block;
  font-weight:800;
  font-size:.74rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:12px;
}

h1,h2,h3,h4{font-weight:800;color:var(--ink);letter-spacing:-.01em}
p{color:var(--muted)}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 26px;border-radius:999px;
  font-weight:700;font-size:.92rem;
  transition:background-color .2s,color .2s,border-color .2s,transform .2s;
}
.btn-primary{background:var(--navy);color:#fff}
.btn-outline{border:1.5px solid var(--line);color:var(--ink)}
.btn-arrow{font-weight:700;color:var(--accent)}
/* Hover-only feedback is gated behind a real pointer everywhere in this
   file: on touch, :hover latches after a tap (there's no pointer to "leave"),
   so a card/button/link would look permanently pressed/lifted until the
   next tap elsewhere. Keyboard focus (:focus-visible) and state classes
   like .active are never gated — they must always work. */
@media (hover:hover) and (pointer:fine){
  .btn-primary:hover{background:var(--accent-d);transform:translateY(-1px)}
  .btn-outline:hover{border-color:var(--accent);color:var(--accent)}
  .btn-arrow:hover{text-decoration:underline}
}

/* ============ TOPBAR + HEADER ============ */
.topbar{
  background:var(--navy);color:#cdd8ea;font-size:.78rem;
  position:fixed;top:0;left:0;right:0;z-index:62;
}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:36px}
.topbar a{color:#cdd8ea;opacity:.85}
.topbar .sep{margin:0 10px;opacity:.35}
.topbar .tb-links{display:flex;align-items:center}
.theme-toggle{
  font:inherit;font-size:.78rem;color:#cdd8ea;opacity:.85;background:none;border:none;
  cursor:pointer;padding:0;
}
@media (hover:hover) and (pointer:fine){
  .topbar a:hover{opacity:1}
  .theme-toggle:hover{opacity:1}
}

header{position:fixed;top:36px;left:0;right:0;z-index:60;background:transparent;transition:box-shadow .3s}
/* The glass lives on ::before, not on <header>: a backdrop-filter on the
   header would turn it into the containing block for the fixed mobile menu
   panel and would also cancel that panel's own backdrop-filter. */
header.scrolled{
  border-bottom:1px solid var(--glass-border);box-shadow:0 2px 22px rgba(19,41,75,.06);
}
header.scrolled::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:var(--header-bg);
  backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);
}
nav{display:flex;align-items:center;justify-content:space-between;height:74px}

.brand{display:flex;align-items:center;gap:12px}
.mark{
  width:38px;height:38px;flex:none;
  display:inline-flex;align-items:center;justify-content:center;
}
.mark img{width:100%;height:100%;object-fit:contain;display:block}
.brand .bt{display:flex;flex-direction:column}
.brand .bt b{font-weight:800;font-size:1.42rem;letter-spacing:.02em;line-height:1;color:#fff;display:block}
.brand .bt span{font-size:.62rem;line-height:1;margin-top:3px;color:#c8d4e8;letter-spacing:.03em;white-space:nowrap}
header.scrolled .brand .bt b{color:var(--ink)}
header.scrolled .brand .bt span{color:var(--muted)}

.menu{display:flex;align-items:center;gap:26px}
.menu>a,.menu>.hassub{display:flex;align-items:center}
.menu a{font-weight:600;font-size:.9rem;color:#e7edf6;position:relative;padding:6px 0;transition:color .2s;white-space:nowrap}
.menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--accent);transition:width .25s}
.menu a.active::after{width:100%}
.menu a.active{color:#fff}
header.scrolled .menu a{color:var(--ink)}
header.scrolled .menu a.active{color:var(--accent)}

.menu .hassub{position:relative}
.menu .hassub>.top{font-weight:600;font-size:.9rem;color:#e7edf6;padding:6px 0;cursor:pointer;display:flex;align-items:center;gap:4px}
header.scrolled .menu .hassub>.top{color:var(--ink)}
.menu .sub{
  position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(10px);
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  box-shadow:0 18px 44px rgba(19,41,75,.13);padding:8px;min-width:168px;
  opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s,transform .2s;display:flex;flex-direction:column;gap:2px;z-index:70;
}
.menu .sub a{padding:9px 14px;border-radius:8px;font-size:.87rem;color:var(--ink) !important}
.menu .sub a::after{display:none}
/* .hassub has no JS-driven open state (see js/components.js) — it's purely
   CSS-hover-driven and currently unused by any nav item. Gating it here is
   correct for the desktop mouse case; if a dropdown nav item is ever added,
   it will need a real click/focus toggle for touch, not just this. */
@media (hover:hover) and (pointer:fine){
  .menu a:hover::after{width:100%}
  .menu a:hover{color:#fff}
  header.scrolled .menu a:hover{color:var(--accent)}
  .menu .hassub>.top:hover{color:var(--accent)}
  .menu .hassub:hover .sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(6px)}
  .menu .sub a:hover{background:var(--soft);color:var(--accent) !important}
}

.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:14px 11px;background:none;border:none}
.burger span{width:23px;height:2px;background:#fff;border-radius:2px;transition:background-color .2s}
header.scrolled .burger span{background:var(--icon)}

/* ============ HERO ============ */
.hero{
  position:relative;min-height:640px;display:flex;align-items:center;
  background:
    radial-gradient(1100px 520px at 82% -10%, rgba(47,98,217,.35), transparent 60%),
    linear-gradient(160deg,var(--navy) 0%, var(--navy2) 55%, #0B1E3A 100%);
  color:#fff;padding:170px 0 90px;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.09) 1px, transparent 1px);
  background-size:26px 26px;mask-image:linear-gradient(180deg,rgba(0,0,0,.5),transparent 70%);
  pointer-events:none;
}
.hero .wrap{position:relative;z-index:2}
.hero-canvas{position:absolute;inset:0;z-index:1;pointer-events:none;display:block}
.hero .eyebrow{color:#8fb2ff}
.hero h1{color:#fff;font-size:clamp(2.05rem,1.15rem + 3.5vw,3.1rem);line-height:1.18;max-width:820px;margin-bottom:20px}
.hero h1 em{font-style:normal;color:#8fb2ff}
.hero p.lead{color:#c9d5ea;font-size:1.08rem;max-width:640px;margin-bottom:34px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:56px}
.hero .btn-outline{border-color:rgba(255,255,255,.35);color:#fff}
.hero .btn-primary{background:#fff;color:var(--navy)}
@media (hover:hover) and (pointer:fine){
  .hero .btn-outline:hover{border-color:#fff}
  .hero .btn-primary:hover{background:#e7edf6}
}

.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:820px}
.hero-stats .stat b{display:block;font-size:clamp(1.55rem,1.15rem + 1.5vw,2.1rem);font-weight:800;color:#fff}
/* direct child only: as a descendant selector this also matched every span
   the odometer builds inside the <b> and shrank the digits to .8rem */
.hero-stats .stat > span{font-size:.8rem;color:#a9bade}

/* page (non-home) hero, smaller */
.pagehero{
  background:linear-gradient(160deg,var(--navy) 0%, var(--navy2) 100%);
  color:#fff;padding:150px 0 60px;position:relative;overflow:hidden;
}
.pagehero::after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.08) 1px, transparent 1px);
  background-size:26px 26px;mask-image:linear-gradient(180deg,rgba(0,0,0,.4),transparent 75%);
}
.pagehero .wrap{position:relative;z-index:2}
.pagehero .eyebrow{color:#8fb2ff}
.pagehero h1{color:#fff;font-size:clamp(1.7rem,1.25rem + 1.8vw,2.3rem)}
.pagehero p{color:#c9d5ea;max-width:600px;margin-top:12px}
.crumb{font-size:.82rem;color:#a9bade;margin-bottom:14px}
@media (hover:hover) and (pointer:fine){
  .crumb a:hover{color:#fff}
}

/* ============ SECTIONS ============ */
section{padding:88px 0}
section.tight{padding:64px 0}
.section-head{max-width:640px;margin-bottom:44px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head h2{font-size:clamp(1.45rem,1.1rem + 1.5vw,2rem);margin-bottom:14px}
.soft-bg{background:var(--soft)}

/* ============ ABOUT / INTRO ============ */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.about-grid p{margin-bottom:16px;font-size:1.02rem}
.about-figure{
  background:var(--soft);border:1px solid var(--line);border-radius:20px;padding:34px;
}
.about-figure .figcell{display:flex;flex-direction:column;gap:4px;padding:15px 0;border-bottom:1px dashed var(--line)}
.about-figure .figcell:last-child{border-bottom:none}
/* label quiet, value loud — the value is the information */
.about-figure .figcell b{
  order:1;color:var(--dim);font-weight:800;font-size:.7rem;
  letter-spacing:.1em;text-transform:uppercase;
}
.about-figure .figcell span{order:2;color:var(--ink);font-weight:700;font-size:1rem}

/* ============ NUMBERED FEATURE LIST ============ */
.numlist{display:flex;flex-direction:column;gap:0;margin-top:10px}
.numlist li{display:flex;gap:18px;padding:18px 0;border-top:1px solid var(--line)}
.numlist li:last-child{border-bottom:1px solid var(--line)}
.numlist .n{font-weight:800;color:var(--accent);font-size:.95rem;flex:none;width:26px}
.numlist p{margin:0;color:var(--ink)}

/* ============ CARDS: research areas ============ */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;transition:box-shadow .2s,transform .2s,border-color .2s;
}
@media (hover:hover) and (pointer:fine){
  .card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:transparent}
}
.card .idx{font-weight:800;color:var(--dim);font-size:.82rem;letter-spacing:.06em;margin-bottom:14px}
.card h3{font-size:1.1rem;margin-bottom:10px}
.card p{font-size:.92rem}

.datasrc-chip{
  display:inline-flex;align-items:center;gap:8px;background:var(--soft);border:1px solid var(--line);
  padding:9px 16px;border-radius:999px;font-weight:700;font-size:.86rem;color:var(--ink);
}
.chiprow{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0}

/* ============ NEWS ============ */
.news-list{display:flex;flex-direction:column}
.news-row{
  display:grid;grid-template-columns:150px 100px 1fr;gap:22px;align-items:start;
  padding:22px 0;border-top:1px solid var(--line);
}
.news-list .news-row:last-child{border-bottom:1px solid var(--line)}
.news-row time{font-weight:700;color:var(--ink);font-size:.86rem;padding-top:2px;white-space:nowrap}
.tag{
  display:inline-flex;align-items:center;justify-content:center;
  font-size:.68rem;font-weight:800;letter-spacing:.06em;padding:5px 10px;border-radius:6px;
  background:var(--soft2);color:var(--accent-d);height:fit-content;text-transform:uppercase;
}
.tag.award{background:var(--spark-bg);color:var(--spark-ink)}
.tag.news{background:var(--soft2);color:var(--accent-d)}
.tag.seminar{background:var(--ok-bg);color:var(--ok-ink)}
.news-row p{color:var(--ink);font-size:.95rem;margin:0}
.news-row p .presenter{color:var(--accent-d);font-weight:800}

/* ============ TIMELINE (projects) ============ */
.timeline{display:flex;flex-direction:column}
.tl-item{
  display:grid;grid-template-columns:190px 1fr;gap:28px;padding:26px 0;border-top:1px solid var(--line);
}
.timeline .tl-item:last-child{border-bottom:1px solid var(--line)}
.tl-item .period{font-weight:800;color:var(--accent);font-size:.86rem}
.tl-item .period small{display:block;font-weight:600;color:var(--dim);margin-top:4px;font-size:.74rem}
.tl-item h4{font-size:1.02rem;margin-bottom:8px;color:var(--ink)}
.tl-item .org{font-size:.84rem;color:var(--muted);margin-bottom:10px}
.people{display:flex;flex-wrap:wrap;gap:6px}
.people span{background:var(--soft);border:1px solid var(--line);padding:4px 10px;border-radius:999px;font-size:.76rem;color:var(--ink)}

/* Colourful participant tags — Our Lab activity cards only. The index
   comes from a hash of the person's name (js/main.js), not from
   nth-child: with position-based colours the same student showed up
   blue on one card and purple on the next, so the colour meant nothing. */
.gallery-body .people span{border:none;font-weight:600}
.gallery-body .people span[data-chip="0"]{background:var(--chip0-bg);color:var(--chip0-ink)}
.gallery-body .people span[data-chip="1"]{background:var(--chip1-bg);color:var(--chip1-ink)}
.gallery-body .people span[data-chip="2"]{background:var(--chip2-bg);color:var(--chip2-ink)}
.gallery-body .people span[data-chip="3"]{background:var(--chip3-bg);color:var(--chip3-ink)}
.gallery-body .people span[data-chip="4"]{background:var(--chip4-bg);color:var(--chip4-ink)}

/* ============ PUBLICATIONS ============ */
.pub-tabs{
  display:flex;gap:10px;margin-bottom:30px;flex-wrap:wrap;
  position:sticky;top:110px;z-index:40;
  background:var(--glass);backdrop-filter:blur(14px) saturate(160%);-webkit-backdrop-filter:blur(14px) saturate(160%);
  padding:14px 16px;border-radius:12px;border:1px solid var(--glass-border);
}
.pub-tab{padding:10px 20px;border-radius:999px;border:1.5px solid var(--line);font-weight:700;font-size:.86rem;color:var(--muted)}
.pub-tab.active{background:var(--navy);border-color:var(--ink);color:#fff}
.pub-group{margin-bottom:12px}
.pub-group-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.pub-group-title h3{font-size:1.4rem}
.pub-group-title span{font-size:.82rem;color:var(--dim);font-weight:700}
.pub-item{
  padding:20px 0;border-top:1px solid var(--line);
  display:grid;grid-template-columns:64px 1fr;column-gap:20px;
}
.pub-group .pub-item:last-child{border-bottom:1px solid var(--line)}
/* The year is the scan anchor, so it gets its own rail rather than sitting
   as one more small line inside a stack of four. Every non-.py child is
   pinned to column 2 explicitly, which keeps the rail intact no matter how
   many lines an entry has (refereed items carry tags, conference ones may
   not, work-in-progress adds a status pill). */
.pub-item .py{
  grid-column:1;grid-row:1;font-weight:800;color:var(--accent);
  font-size:.95rem;font-variant-numeric:tabular-nums;padding-top:1px;
}
.pub-item > *:not(.py){grid-column:2}
/* an inline <span> as a grid item gets blockified and would stretch across
   the whole row — the same trap the news tag fell into */
.pub-item > .status-pill{justify-self:start}
/* work-in-progress entries have no year to put in the rail */
[data-pub-group="wip"] .pub-item{grid-template-columns:1fr}
[data-pub-group="wip"] .pub-item > *{grid-column:1}
.pub-scope{
  display:inline-block;font-size:.68rem;font-weight:800;letter-spacing:.06em;
  text-transform:uppercase;padding:2px 7px;border-radius:5px;margin-right:8px;
  background:var(--soft2);color:var(--accent-d);vertical-align:1px;
}
.pub-item h4{font-size:1rem;color:var(--ink);font-weight:700;margin-bottom:6px;line-height:1.5}
.pub-item h4 a.pub-pdf-link{color:inherit}
@media (hover:hover) and (pointer:fine){
  .pub-item h4 a.pub-pdf-link:hover{color:var(--accent)}
}
.pdf-badge{
  display:inline-flex;align-items:center;font-size:.68rem;font-weight:800;letter-spacing:.03em;
  color:var(--accent-d);background:var(--soft2);padding:2px 8px;border-radius:6px;
  margin-left:4px;white-space:nowrap;vertical-align:middle;
}
.pub-item .jinfo{font-size:.86rem;color:var(--muted);margin-bottom:8px}
.pub-item .jinfo b{color:var(--ink)}
.pub-item .authors{font-size:.84rem;color:var(--dim)}
.pub-item .authors b{color:var(--ink);font-weight:700}
.pub-item .ptags{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
/* keyword chips are the least important line here — borderless and quiet so
   they stop out-weighing the journal name and impact factor above them */
.pub-item .ptags span{font-size:.72rem;background:var(--soft);color:var(--dim);padding:3px 9px;border-radius:6px}
.pub-doi{
  display:inline-flex;align-items:center;gap:4px;font-size:.78rem;font-weight:700;
  color:var(--accent);margin-top:8px;
}
@media (hover:hover) and (pointer:fine){
  .pub-doi:hover{text-decoration:underline}
}
.status-pill{font-size:.7rem;font-weight:800;padding:3px 10px;border-radius:999px;background:var(--spark-bg);color:var(--spark-ink);letter-spacing:.03em}

/* ============ PEOPLE ============ */
.person-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;text-align:left;
  display:flex;flex-direction:column;gap:14px;transition:box-shadow .2s,transform .2s;
}
@media (hover:hover) and (pointer:fine){
  .person-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
}
/* The director's card holds far more than a student's (six interest tags,
   an email); side by side in the same grid it made every row look ragged.
   Given its own full-width lead row, the student grid stays even. */
.lead-card{flex-direction:row;gap:26px;align-items:flex-start;margin-bottom:22px}
.lead-card .avatar{width:104px;height:104px;border-radius:18px;font-size:1.8rem}
.lead-card .lead-body{display:flex;flex-direction:column;gap:10px;min-width:0}
.lead-card .contact{border-top:none;padding-top:0}
/* one even grid for the students: equal-height cards, meta pinned to the
   bottom so the contact line lines up across the row */
.member-grid .person-card{justify-content:flex-start}
.member-grid .person-card .contact{margin-top:auto}
@media (max-width:640px){
  .lead-card{flex-direction:column;gap:16px}
}
.avatar{
  width:64px;height:64px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--navy2));
  color:#fff;font-weight:800;font-size:1.2rem;display:flex;align-items:center;justify-content:center;
  overflow:hidden;flex:none;
}
.avatar img{width:100%;height:100%;object-fit:cover;display:block}
.avatar.big{width:150px;height:150px;font-size:2.6rem;border-radius:22px}
.person-card h4{font-size:1.05rem;color:var(--ink)}
.person-card .role{font-size:.8rem;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.04em}
.person-card .join{font-size:.78rem;color:var(--dim)}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tags span{font-size:.72rem;background:var(--soft);border:1px solid var(--line);padding:3px 9px;border-radius:6px;color:var(--muted)}
.person-card .contact{font-size:.82rem;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;display:flex;flex-direction:column;gap:4px}
@media (hover:hover) and (pointer:fine){
  .person-card .contact a:hover{color:var(--accent)}
}

.alumni-table{width:100%;border-collapse:collapse}
.alumni-table th{text-align:left;font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--dim);padding:0 0 14px;border-bottom:2px solid var(--line)}
.alumni-table td{padding:16px 0;border-bottom:1px solid var(--line);font-size:.92rem;color:var(--ink)}
.alumni-table td.name{font-weight:700;color:var(--ink)}
.alumni-table td.dest{color:var(--accent-d);font-weight:600}
.alumni-table td.period{color:var(--muted);font-size:.86rem}

/* ============ DIRECTOR ============ */
.director-hero{display:grid;grid-template-columns:220px 1fr;gap:44px;align-items:start}
/* an <h2> in the outline (the page already has its h1 in the pagehero) but
   the visually dominant element on the page — it names the person */
.director-hero .person-name{font-size:clamp(1.7rem,1.2rem + 2vw,2.4rem);line-height:1.2;margin-bottom:6px}
.director-hero .role{color:var(--accent);font-weight:700;margin-bottom:18px}
.director-info{display:flex;flex-direction:column;gap:6px;font-size:.92rem;color:var(--muted);margin-top:6px}
.director-info b{color:var(--ink)}

.cv-block{margin-top:70px}
.cv-block h3{font-size:1.4rem;margin-bottom:22px;padding-bottom:14px;border-bottom:2px solid var(--line)}
.cv-row{display:grid;grid-template-columns:160px 1fr;gap:20px;padding:16px 0;border-top:1px solid var(--line)}
.cv-block .cv-row:last-child{border-bottom:1px solid var(--line)}
.cv-row .deg{font-weight:800;color:var(--ink);font-size:.9rem}
.cv-row .detail b{color:var(--ink);display:block;margin-bottom:2px}
@media (hover:hover) and (pointer:fine){
  .cv-row .detail b a:hover{color:var(--accent)}
}
.cv-row .detail span{color:var(--muted);font-size:.88rem}
.interest-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:6px}
.interest-grid .card{padding:22px}

.ri-card{display:flex;flex-direction:column}
.ri-canvas{width:100%;height:92px;border-radius:10px;background:var(--soft);display:block;margin-bottom:14px}

.process-illustration{
  background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);
  padding:8px 26px;margin:26px 0 10px;
}
.process-illustration canvas{width:100%;height:150px;display:block}

.pipeline-illustration{
  background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);
  padding:8px 26px;margin:26px 0 10px;
}
.pipeline-illustration canvas{width:100%;height:230px;display:block}

/* ============ LECTURES ============ */
.lec-table{width:100%;border-collapse:collapse;margin-top:10px}
.lec-table th{text-align:left;font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--dim);padding:0 14px 14px;border-bottom:2px solid var(--line)}
.lec-table td{padding:18px 14px;border-bottom:1px solid var(--line);font-size:.92rem;vertical-align:top}
.lec-table td.cname{font-weight:700;color:var(--ink)}
.lec-table td.sem{color:var(--muted);font-size:.86rem;white-space:nowrap}
.status-badge{font-size:.72rem;font-weight:800;padding:4px 10px;border-radius:999px;white-space:nowrap}
.status-badge.running{background:var(--ok-bg);color:var(--ok-ink)}
.status-badge.closed{background:var(--soft2);color:var(--muted)}
.level-badge{font-size:.72rem;font-weight:700;padding:3px 9px;border-radius:6px;background:var(--soft);color:var(--muted)}

/* ============ ACTIVITY / GALLERY ============ */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.gallery-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:box-shadow .2s,transform .2s}
@media (hover:hover) and (pointer:fine){
  .gallery-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
}
.gallery-thumb{
  height:150px;background:linear-gradient(135deg,var(--soft2),var(--soft));
  display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative;
}
.gallery-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb-kind{display:flex;flex-direction:column;align-items:center;gap:7px;color:var(--kind-ink)}
.thumb-kind svg{width:30px;height:30px;stroke:currentColor;fill:none;stroke-width:1.6;
  stroke-linecap:round;stroke-linejoin:round}
.thumb-kind b{font-size:.72rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase}
.thumb-kind i{font-style:normal;font-size:.7rem;font-weight:700;opacity:.7;letter-spacing:.04em}
.gallery-thumb{--kind-ink:var(--dim)}
.gallery-thumb[data-kind="conference"]{background:linear-gradient(135deg,var(--chip0-bg),var(--soft));--kind-ink:var(--chip0-ink)}
.gallery-thumb[data-kind="commencement"]{background:linear-gradient(135deg,var(--chip3-bg),var(--soft));--kind-ink:var(--chip3-ink)}
.gallery-thumb[data-kind="seminar"]{background:linear-gradient(135deg,var(--chip1-bg),var(--soft));--kind-ink:var(--chip1-ink)}
.gallery-body{padding:20px}
.gallery-body time{font-size:.78rem;color:var(--accent);font-weight:700}
.gallery-body h4{font-size:.96rem;margin:8px 0 10px;color:var(--ink);line-height:1.5}
.gallery-body .people{margin-top:2px}

/* ============ CONTACT ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-card{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.contact-card h3{font-size:1.05rem;margin-bottom:16px}
.contact-line{display:flex;gap:12px;padding:12px 0;border-top:1px dashed var(--line)}
.contact-card .contact-line:first-of-type{border-top:none}
.contact-line b{color:var(--ink);min-width:64px;font-size:.86rem}
.contact-line span, .contact-line a{color:var(--muted);font-size:.9rem}
@media (hover:hover) and (pointer:fine){
  .contact-line a:hover{color:var(--accent)}
}
.mapwrap{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);margin-top:26px}
.mapwrap iframe{width:100%;height:340px;border:0;display:block}

.social-row{display:flex;gap:12px;margin-top:20px}
.social-btn{
  display:flex;align-items:center;gap:10px;padding:12px 18px;border-radius:999px;
  border:1.5px solid var(--line);font-weight:700;font-size:.86rem;color:var(--ink);
}
@media (hover:hover) and (pointer:fine){
  .social-btn:hover{border-color:var(--accent);color:var(--accent)}
}

/* ============ CTA BAND ============ */
.cta{
  background:linear-gradient(160deg,var(--navy),var(--navy2));color:#fff;border-radius:24px;
  padding:56px;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;
}
.cta h2{color:#fff;font-size:clamp(1.3rem,1.05rem + 1vw,1.7rem);max-width:480px}
.cta p{color:#c9d5ea;margin-top:8px}
/* the default --accent eyebrow is only 2.6:1 on this dark band */
.cta .eyebrow{color:#8fb2ff}

/* ============ FOOTER ============ */
footer{background:var(--navy);color:#c8d4e8;padding:64px 0 26px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.12)}
.foot-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.foot-brand b{color:#fff;font-size:1.2rem;font-weight:800}
.foot-col h2{color:#fff;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}
.foot-col a,.foot-col span{display:block;color:#a9bade;font-size:.88rem;margin-bottom:10px}
@media (hover:hover) and (pointer:fine){
  .foot-col a:hover{color:#fff}
}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;font-size:.8rem;color:#7f93b8;flex-wrap:wrap;gap:10px}

/* ============ SCROLL REVEAL ============ */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal-in{opacity:1;transform:none}

/* ============ STAGGERED GROUP REVEAL ============ */
/* Piggybacks on the section-level .reveal-in toggle above (see
   initScrollReveal in js/components.js) instead of a second observer —
   once the ancestor <section> is revealed, these children fade/rise in
   with a small per-item delay. Delays are hand-listed and capped at
   nth-child(6) so a long list (news, once "지난 소식 더 보기" expands it)
   doesn't turn into a sluggish multi-second cascade. New rows appended by
   initNewsToggle (js/main.js) reuse this same transition via a temporary
   inline-style override instead of a separate animation. */
.about-figure .figcell,
.chiprow .datasrc-chip,
.numlist li,
.news-list .news-row{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s ease,transform .5s ease;
}
.reveal-in .about-figure .figcell,
.reveal-in .chiprow .datasrc-chip,
.reveal-in .numlist li,
.reveal-in .news-list .news-row{
  opacity:1;transform:none;
}
.about-figure .figcell:nth-child(1),.chiprow .datasrc-chip:nth-child(1),.numlist li:nth-child(1),.news-list .news-row:nth-child(1){transition-delay:.04s}
.about-figure .figcell:nth-child(2),.chiprow .datasrc-chip:nth-child(2),.numlist li:nth-child(2),.news-list .news-row:nth-child(2){transition-delay:.09s}
.about-figure .figcell:nth-child(3),.chiprow .datasrc-chip:nth-child(3),.numlist li:nth-child(3),.news-list .news-row:nth-child(3){transition-delay:.14s}
.about-figure .figcell:nth-child(4),.chiprow .datasrc-chip:nth-child(4),.numlist li:nth-child(4),.news-list .news-row:nth-child(4){transition-delay:.19s}
.about-figure .figcell:nth-child(5),.chiprow .datasrc-chip:nth-child(5),.news-list .news-row:nth-child(5){transition-delay:.24s}
.chiprow .datasrc-chip:nth-child(n+6),.news-list .news-row:nth-child(n+6){transition-delay:.29s}
@media (prefers-reduced-motion:reduce){
  .about-figure .figcell,.chiprow .datasrc-chip,.numlist li,.news-list .news-row{
    opacity:1;transform:none;transition:none;
  }
}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

/* ============ ODOMETER STAT COUNTER ============ */
/* The digit windows only line up with the suffix if every box is exactly
   1em tall at the counter's own font-size — hence line-height:1 all the
   way down. The flex row lives on .odo-visual rather than on the <b>, so
   the <b> stays display:block and its label still sits underneath it. */
.odo-digits{font-variant-numeric:tabular-nums;line-height:1}
.odo-visual{display:inline-flex;align-items:flex-start;line-height:1}
.odo-window{display:inline-block;overflow:hidden;height:1em;line-height:1}
.odo-strip{display:block;transition:transform .85s cubic-bezier(.22,.9,.3,1)}
.odo-strip span{display:block;height:1em;line-height:1}
.odo-suffix{display:block;height:1em;line-height:1;margin-left:.05em}

/* ============ SPLIT-WORD SCROLL REVEAL ============ */
.split-reveal .rv-word{
  display:inline-block;opacity:0;transform:translateY(.3em);filter:blur(4px);
  transition:opacity .6s cubic-bezier(.22,.9,.32,1),transform .6s cubic-bezier(.22,.9,.32,1),filter .6s ease;
}
.split-reveal.split-in .rv-word{opacity:1;transform:none;filter:blur(0)}

/* ============ SECTION NAV RAIL ============ */
.section-rail{
  position:fixed;right:22px;top:50%;transform:translateY(-50%);z-index:45;
  display:flex;flex-direction:column;gap:14px;align-items:flex-end;
}
.section-rail a{
  position:relative;display:block;width:8px;height:8px;border-radius:50%;
  background:var(--dim);opacity:.55;transition:opacity .25s,background-color .25s,width .25s,height .25s,box-shadow .25s;
}
.section-rail a:focus-visible,.section-rail a.active{opacity:1}
.section-rail a.active{background:var(--teal);width:10px;height:10px;box-shadow:0 0 0 4px rgba(18,165,148,.18)}
.section-rail .rail-label{
  position:absolute;right:20px;top:50%;transform:translateY(-50%);
  white-space:nowrap;font-size:.72rem;font-weight:700;color:var(--ink);
  background:var(--card);border:1px solid var(--line);border-radius:8px;padding:5px 12px;
  opacity:0;pointer-events:none;transition:opacity .2s;box-shadow:var(--shadow);
}
.section-rail a:focus-visible .rail-label{opacity:1}
@media (hover:hover) and (pointer:fine){
  .section-rail a:hover{opacity:1}
  .section-rail a:not(.active):hover{background:var(--accent)}
  .section-rail a:hover .rail-label{opacity:1}
}
@media (max-width:1300px){ .section-rail{display:none} }

/* ============ MOBILE NAV SCRIM ============ */
/* Starts below the fixed chrome so the header stays legible above it.
   z-index 55 puts it over all page chrome (rail 45, back-to-top 50) but
   under the header (60), whose menu panel therefore stays on top. */
.nav-overlay{
  position:fixed;inset:110px 0 0;z-index:55;background:rgba(10,23,41,.45);
  opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;
}
.nav-overlay.show{opacity:1;visibility:visible}
@media (min-width:1025px){ .nav-overlay{display:none} }
html.nav-open{overflow:hidden}

/* ============ BACK TO TOP ============ */
.back-to-top{
  position:fixed;right:22px;bottom:22px;z-index:50;
  width:44px;height:44px;border-radius:50%;border:1px solid var(--line);
  background:var(--card);color:var(--ink);font-size:1.1rem;font-weight:700;
  box-shadow:var(--shadow);cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .25s,transform .25s,visibility .25s,border-color .2s,color .2s;
}
.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
@media (hover:hover) and (pointer:fine){
  .back-to-top:hover{border-color:var(--accent);color:var(--accent)}
}

/* ============ TILT ============ */
.person-card,.gallery-card{transform-style:preserve-3d;will-change:transform}

/* ============ FOCUS STATES ============ */
/* ============ INLINE LINKS ============ */
/* a{color:inherit;text-decoration:none} globally means a mailto: inside a
   contact row was visually identical to the phone number beside it — the
   only cue was hover colour, which touch devices never show. */
.contact-line a,
.director-info a,
.person-card .contact a,
.cv-row .detail b a{
  color:var(--accent);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
@media (hover:hover) and (pointer:fine){
  .contact-line a:hover,
  .director-info a:hover,
  .person-card .contact a:hover,
  .cv-row .detail b a:hover{text-decoration-thickness:2px}
}

a:focus-visible,button:focus-visible,input:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;
}
.burger:focus-visible{outline-offset:4px}

/* ============ LAYOUT UTILITIES ============ */
/* Replaces the style="margin-top:50px" / "overflow-x:auto" attributes that
   had accumulated across research / publications / members / lectures. */
.mt-block{margin-top:50px}
.mt-group{margin-top:56px}
.mt-24{margin-top:30px}
.center-block{text-align:center;margin-top:34px}
.center-block-lg{text-align:center;margin-top:60px}
.table-scroll{overflow-x:auto}
.card-note{margin-top:16px;color:var(--dim);font-size:.84rem}
.cname-en{color:var(--dim);font-weight:500}
.pub-item .authors{margin-top:8px}
.mark-sm{width:34px;height:34px}
.hero-centered{min-height:520px;text-align:center}
.hero-centered h1{max-width:none}
.hero-centered .eyebrow{display:block}
.hero-centered .lead{margin-left:auto;margin-right:auto}
.hero-centered .actions{justify-content:center}

/* ============ PRINT ============ */
/* The CV, the publication list and the course table all get printed. */
@media print{
  :root{
    --ink:#000; --muted:#333; --dim:#555; --line:#bbb;
    --bg:#fff; --card:#fff; --soft:#fff; --soft2:#fff; --accent:#000; --accent-d:#000;
  }
  .topbar, header, footer, .section-rail, .back-to-top, .nav-overlay,
  .hero-canvas, .pub-tabs, #newsMoreBtn, .cta, .mapwrap, .social-row{display:none !important}
  body{background:#fff;color:#000;line-height:1.5}
  .hero, .pagehero{background:#fff !important;color:#000;padding:0 0 18px;min-height:0}
  .hero h1, .pagehero h1, .hero p, .pagehero p, .hero .eyebrow, .pagehero .eyebrow{color:#000}
  section{padding:14px 0;break-inside:auto}
  .wrap{max-width:none;padding:0}
  /* every filter tab is hidden in print, so show all publication groups */
  [data-pub-group], [data-member-group]{display:block !important}
  .pub-item, .cv-row, .tl-item, .person-card, .news-row{break-inside:avoid}
  .card, .person-card, .contact-card, .about-figure,
  .process-illustration, .pipeline-illustration{
    box-shadow:none !important;border:1px solid #ccc;break-inside:avoid;
  }
  .reveal{opacity:1 !important;transform:none !important}
  .split-reveal .rv-word{opacity:1 !important;transform:none !important;filter:none !important}
  /* a printed page can't be clicked, so spell the destination out */
  .pub-doi::after{content:" (" attr(href) ")";font-weight:400}
  a[href^="mailto:"]::after{content:" (" attr(href) ")";font-size:.85em;color:#555}
}

/* ============ RESPONSIVE ============ */
@media (max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr;gap:30px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:30px}
  .director-hero{grid-template-columns:1fr}
  .gallery-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
}
/* The 8-item menu plus the brand lockup stops fitting around 1050px — well
   above the old 760px burger breakpoint, which left the 760–1050px band
   showing a 3-line brand tagline and a wrapped "Our Lab". */
@media (max-width:1024px){
  /* Sits below the fixed chrome (36px topbar + 74px nav) so the logo and
     burger stay visible and crisp above it, and is fully opaque: a glass
     panel here reads as broken because the page text behind it stays sharp
     (a parent backdrop-filter cancels a child's). */
  .menu{position:fixed;top:110px;right:0;width:80%;max-width:320px;
    height:calc(100vh - 110px);height:calc(100dvh - 110px);
    background:var(--card);border-left:1px solid var(--line);border-top:1px solid var(--line);
    flex-direction:column;align-items:stretch;padding:20px 26px 40px;gap:2px;
    overflow-y:auto;overscroll-behavior:contain;
    transform:translateX(100%);transition:transform .3s;box-shadow:-14px 0 44px rgba(10,23,41,.22);}
  .menu.open{transform:translateX(0)}
  .menu a,.menu .hassub>.top{color:var(--ink) !important;width:100%;padding:14px 2px}
  .menu>a{border-bottom:1px solid var(--line)}
  .menu>a:last-child{border-bottom:none}
  .menu a::after{display:none}
  .menu .hassub{width:100%;flex-direction:column;align-items:flex-start}
  .menu .sub{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:none;padding:0 0 0 12px;display:none;width:100%}
  .menu .hassub.open .sub{display:flex}
  .burger{display:flex}
  .burger span{background:var(--icon) !important}
}

@media (max-width:760px){
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .grid-4,.grid-3,.grid-2,.interest-grid{grid-template-columns:1fr}
  .pub-item{grid-template-columns:46px 1fr;column-gap:12px}
  .pub-item .py{font-size:.86rem}
  .news-row{grid-template-columns:auto 1fr;gap:10px 12px}
  .news-row time{grid-column:1;align-self:center}
  .news-row .tag{grid-column:2;justify-self:start}
  .news-row p{grid-column:1 / -1}
  .topbar .wrap span:first-child{display:none}
  .topbar .wrap{justify-content:flex-end}
  .tl-item{grid-template-columns:1fr}
  .cv-row{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .gallery-grid{grid-template-columns:1fr}
  .cta{padding:36px;flex-direction:column;align-items:flex-start}
  section{padding:56px 0}
  .pagehero{padding:130px 0 44px}
}