/* ==========================================================================
   A2DL — AI Autonomous Drug Discovery Lab, KRICT
   ========================================================================== */

:root{
  --bg:#fbfcfd;
  --surface:#ffffff;
  --surface-2:#f2f6f8;
  --ink:#0d1b21;
  --ink-soft:#33505c;
  --muted:#607886;
  --line:#dde5ea;
  --brand:#0e4f5c;
  --brand-2:#1d8fa3;
  --brand-soft:#e6f2f5;
  --accent:#c2762a;
  --shadow:0 1px 2px rgba(13,27,33,.05), 0 8px 24px -12px rgba(13,27,33,.18);
  --shadow-lg:0 2px 4px rgba(13,27,33,.06), 0 24px 48px -20px rgba(13,27,33,.28);
  --radius:14px;
  --wrap:1120px;
  --font:"Noto Sans KR","IBM Plex Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg:#081318;
    --surface:#0e2029;
    --surface-2:#122a34;
    --ink:#e9f2f5;
    --ink-soft:#bdd2da;
    --muted:#8ba7b3;
    --line:#1d3a45;
    --brand:#5cc6d8;
    --brand-2:#7fdcea;
    --brand-soft:#12303a;
    --accent:#e0a35c;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
    --shadow-lg:0 2px 4px rgba(0,0,0,.4), 0 24px 48px -20px rgba(0,0,0,.7);
  }
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.3;letter-spacing:-.02em;margin:0}
:focus-visible{outline:2.5px solid var(--brand-2);outline-offset:3px;border-radius:4px}
sup{font-size:.62em;line-height:0;vertical-align:super;font-weight:inherit}

/* language switching ---------------------------------------------------- */
/* 언어 전환은 어떤 레이아웃 규칙보다 우선해야 합니다.
   (예: .hero h1 span[data-lang] 처럼 명시도가 더 높은 규칙이 있으면
    !important 없이는 숨김이 무시되어 두 언어가 함께 보입니다) */
html[lang="ko"] [data-lang="en"]{display:none !important}
html[lang="en"] [data-lang="ko"]{display:none !important}

.skip{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--brand);color:#fff;padding:.7rem 1.2rem;border-radius:0 0 8px 0;
}
.skip:focus{left:0}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* ===================== NAV ===================== */
.nav{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid transparent;transition:border-color .2s, box-shadow .2s;
}
.nav.scrolled{border-bottom-color:var(--line);box-shadow:0 4px 20px -14px rgba(0,0,0,.4)}
.nav-inner{
  max-width:var(--wrap);margin:0 auto;padding:12px 24px;
  display:flex;align-items:center;gap:20px;
}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;flex:0 1 auto;min-width:0}
.brand:hover{text-decoration:none}
.brand-mark{width:30px;height:30px;flex:none}
.brand-mark circle{fill:var(--brand-2)}
.brand-mark path{stroke:var(--brand-2);stroke-width:1.8;fill:none;opacity:.65}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-text strong{font-size:1.02rem;font-weight:900;letter-spacing:-.02em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-text em{font-style:normal;font-size:.72rem;color:var(--muted);letter-spacing:.02em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center;flex:0 0 auto}
.nav-links a{
  color:var(--ink-soft);font-size:.88rem;font-weight:500;
  padding:8px 12px;border-radius:8px;text-decoration:none;transition:background .15s,color .15s;
}
.nav-links a:hover{background:var(--brand-soft);color:var(--brand);text-decoration:none}
.nav-links a.active{color:var(--brand-2);font-weight:700}

.nav-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.lang-toggle{
  font-family:var(--font);font-size:.78rem;font-weight:700;letter-spacing:.06em;
  color:var(--ink-soft);background:transparent;border:1px solid var(--line);
  padding:7px 12px;border-radius:999px;cursor:pointer;transition:all .15s;
}
.lang-toggle:hover{border-color:var(--brand-2);color:var(--brand-2)}

.menu-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;background:none;border:1px solid var(--line);border-radius:9px;cursor:pointer;padding:0 9px}
.menu-toggle span{display:block;height:2px;background:var(--ink);border-radius:2px;transition:transform .22s, opacity .22s}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===================== HERO ===================== */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(150deg,#0b3f4b 0%,#0e4f5c 42%,#12707f 100%);
  color:#eaf6f8;padding:104px 0 112px;
}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;opacity:.3}
.hero-bg .mol path{stroke:#9fe6f0;stroke-width:1.4;fill:none}
.hero-bg .mol circle{fill:#bff0f7}
.hero-inner{position:relative;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.eyebrow{
  margin:0 0 18px;font-size:.8rem;font-weight:700;letter-spacing:.13em;text-transform:uppercase;
  color:#8fe2ef;
}
.hero h1{margin:0 0 22px}
.hero h1 .wordmark{
  display:block;font-size:clamp(3rem,9vw,5.2rem);font-weight:900;letter-spacing:-.045em;
  line-height:1;color:#fff;margin-bottom:.14em;
}
.hero h1 .wordmark sup{font-size:.46em;letter-spacing:0}
.hero h1 span[data-lang]{
  display:block;font-size:clamp(1.35rem,3.3vw,2.05rem);font-weight:700;
  letter-spacing:-.025em;color:#a9dfe9;line-height:1.35;
}
.hero-lead{max-width:44rem;font-size:clamp(1rem,1.9vw,1.16rem);color:#c8e6ec;margin:0 0 34px;line-height:1.85}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}

.btn{
  display:inline-block;padding:13px 26px;border-radius:999px;font-size:.93rem;font-weight:700;
  text-decoration:none;transition:transform .15s, box-shadow .15s, background .15s, border-color .15s;
}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:#fff;color:#0b3f4b;box-shadow:0 10px 24px -12px rgba(0,0,0,.6)}
.btn-primary:hover{box-shadow:0 16px 30px -14px rgba(0,0,0,.7)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.5);color:#eaf6f8}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.1)}
.section .btn-primary{background:var(--brand);color:#fff}
.section .btn-ghost{border-color:var(--line);color:var(--ink-soft)}
.section .btn-ghost:hover{border-color:var(--brand-2);color:var(--brand-2);background:var(--brand-soft)}

/* ===================== SECTIONS ===================== */
.section{padding:88px 0}
.section-alt{background:var(--surface-2)}
.sec-head{margin-bottom:44px;max-width:46rem}
.sec-eyebrow{
  margin:0 0 10px;font-size:.76rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-2);
}
.sec-head h2{font-size:clamp(1.55rem,3.4vw,2.15rem);font-weight:800}
.sub-head{
  margin:56px 0 20px;font-size:1.15rem;font-weight:800;
  padding-bottom:12px;border-bottom:1px solid var(--line);
}

/* about */
.about-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:52px;align-items:start}
.about-text p{margin:0 0 20px;color:var(--ink-soft)}
.about-text strong{color:var(--ink);font-weight:700}
.stats{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.stats li{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 18px;text-align:center;box-shadow:var(--shadow);
}
.stats strong{display:block;font-size:1.85rem;font-weight:900;color:var(--brand-2);line-height:1.2}
.stats span{display:block;font-size:.78rem;color:var(--muted);margin-top:4px;line-height:1.4}

/* research cards */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;box-shadow:var(--shadow);transition:transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--brand-2)}
.card-icon{width:34px;height:34px;margin-bottom:16px;stroke:var(--brand-2);stroke-width:1.6;fill:none;
  stroke-linecap:round;stroke-linejoin:round}
.card-icon circle[fill]{fill:var(--brand-2)}
.card h3{font-size:1.1rem;font-weight:800;margin:0 0 10px}
.card p{margin:0;color:var(--ink-soft);font-size:.95rem}

/* people */
.people{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.person{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;text-align:center;box-shadow:var(--shadow);
}
.avatar,.avatar-img{
  width:92px;height:92px;border-radius:50%;margin:0 auto 18px;
}
.avatar{
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(145deg,var(--brand),var(--brand-2));
  color:#fff;font-size:2.1rem;font-weight:700;letter-spacing:-.02em;
}
.avatar-img{object-fit:cover;border:3px solid var(--brand-soft)}
.person h3{font-size:1.18rem;font-weight:800;margin:0 0 6px}
.person h3 em{font-style:normal;font-size:.8rem;font-weight:500;color:var(--muted);margin-left:6px}
.role{margin:0 0 16px;font-size:.87rem;color:var(--ink-soft);line-height:1.6}
.tags{list-style:none;display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin:0 0 16px;padding:0}
.tags li{
  font-size:.74rem;font-weight:600;color:var(--brand);background:var(--brand-soft);
  padding:4px 11px;border-radius:999px;
}
.person-contact{margin:0;font-size:.83rem;word-break:break-all}
.person-contact .tel{display:block;margin-top:3px;color:var(--muted);word-break:normal}
.tel-note{display:block;font-size:.82rem;color:var(--muted);margin-top:2px}

.member-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.member-list li{
  background:var(--surface);border:1px solid var(--line);border-radius:10px;
  padding:14px 18px;display:flex;flex-direction:column;
}
.m-name{font-weight:700;font-size:.95rem}
.m-role{font-size:.8rem;color:var(--muted)}

/* publications */
.pub-year{margin-bottom:36px}
.pub-year h3{
  font-size:1.5rem;font-weight:900;color:var(--brand-2);letter-spacing:-.02em;
  margin:0 0 14px;padding-bottom:10px;border-bottom:2px solid var(--line);
}
.pubs{margin:0;padding-left:1.4em}
.pubs li{margin-bottom:18px;padding-left:6px}
.pubs li::marker{color:var(--muted);font-size:.85rem}
.pubs span{display:block}
.authors{font-size:.86rem;color:var(--muted)}
.pub-title{font-weight:700;color:var(--ink);margin:2px 0;line-height:1.55}
.venue{font-size:.86rem;color:var(--ink-soft)}
.links{margin-top:5px}
.links a{
  font-size:.74rem;font-weight:700;letter-spacing:.04em;
  border:1px solid var(--line);border-radius:6px;padding:2px 9px;display:inline-block;
}
.links a:hover{border-color:var(--brand-2);text-decoration:none;background:var(--brand-soft)}
.note{font-size:.82rem;color:var(--muted);margin:0}
.pub-empty{
  margin:0;padding:28px 26px;border:1px dashed var(--line);border-radius:var(--radius);
  color:var(--muted);font-size:.95rem;background:var(--surface);
}
.authors b{color:var(--ink);font-weight:700}

/* 이전 연도 논문 펼치기 / 접기 */
.pub-toggle{
  display:inline-flex;align-items:center;gap:8px;font-family:var(--font);
  font-size:.88rem;font-weight:700;color:var(--brand-2);
  background:var(--surface);border:1px solid var(--line);border-radius:999px;
  padding:11px 22px;cursor:pointer;transition:border-color .15s,background .15s;
}
.pub-toggle:hover{border-color:var(--brand-2);background:var(--brand-soft)}
.pub-toggle::after{
  content:"";width:7px;height:7px;margin-left:2px;
  border-right:2px solid currentColor;border-bottom:2px solid currentColor;
  transform:translateY(-2px) rotate(45deg);transition:transform .2s;
}
.pub-toggle[aria-expanded="true"]::after{transform:translateY(1px) rotate(-135deg)}
.pub-toggle .pub-toggle-close{display:none}
.pub-toggle[aria-expanded="true"] .pub-toggle-open{display:none}
.pub-toggle[aria-expanded="true"] .pub-toggle-close{display:inline}
.pub-older{margin-top:30px;padding-top:6px;border-top:1px solid var(--line)}

/* join */
.join{display:grid;grid-template-columns:1.6fr 1fr;gap:48px;align-items:start}
.join-text h2{font-size:clamp(1.5rem,3.2vw,2rem);font-weight:800;margin:0 0 20px}
.join-text p{color:var(--ink-soft);margin:0 0 20px}
.check{list-style:none;margin:0 0 24px;padding:0}
.check li{position:relative;padding-left:30px;margin-bottom:11px;color:var(--ink-soft);font-size:.95rem}
.check li::before{
  content:"";position:absolute;left:2px;top:.55em;width:14px;height:8px;
  border-left:2.4px solid var(--brand-2);border-bottom:2.4px solid var(--brand-2);
  transform:rotate(-45deg);
}
.join-side{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow);position:sticky;top:104px;
}
.join-side h3{font-size:1rem;font-weight:800;margin:0 0 16px;color:var(--brand-2)}
.join-side ul{list-style:none;margin:0 0 20px;padding:0}
.join-side li{
  display:flex;justify-content:space-between;align-items:baseline;gap:10px;
  padding:11px 0;border-bottom:1px solid var(--line);
}
.join-side li:last-child{border-bottom:none}
.join-side strong{font-size:.92rem;font-weight:700}
.join-side li span{font-size:.78rem;color:var(--muted);text-align:right}
.side-link{font-size:.85rem;font-weight:700}

/* contact */
.contact{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:start}
.contact dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:14px 26px;align-items:baseline}
.contact dt{
  font-size:.76rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);white-space:nowrap;
}
/* 사람 이름 행은 대문자 변환 없이 본문 색으로 */
.contact dt.dt-person{
  font-size:.92rem;font-weight:700;letter-spacing:-.01em;text-transform:none;color:var(--ink);
}
.contact dt.dt-person em{
  display:block;font-style:normal;font-size:.74rem;font-weight:500;
  color:var(--muted);letter-spacing:0;margin-top:1px;
}
.contact dd{margin:0;color:var(--ink-soft);font-size:.95rem}
.map-note p{margin:0 0 20px;color:var(--ink-soft);font-size:.95rem}

/* footer */
.footer{background:var(--brand);color:#dceef2;padding:44px 0;margin-top:0}
@media (prefers-color-scheme: dark){.footer{background:#071016;border-top:1px solid var(--line)}}
.footer-inner{text-align:center}
.f-lab{margin:0 0 6px;font-weight:800;font-size:1.02rem;color:#fff;letter-spacing:-.01em}
.f-org{margin:0 0 16px;font-size:.86rem;opacity:.82}
.f-copy{margin:0;font-size:.78rem;opacity:.62}

/* ===================== RESPONSIVE ===================== */
@media (max-width:960px){
  .about-grid,.join,.contact{grid-template-columns:1fr;gap:34px}
  .join-side{position:static}
  .people,.member-list{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  html{scroll-padding-top:74px}
  .menu-toggle{display:flex}
  .nav-links{
    position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--surface);border-bottom:1px solid var(--line);
    padding:8px 16px 16px;box-shadow:var(--shadow-lg);display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 10px;border-radius:8px;font-size:.95rem}
  .nav-inner{gap:12px;padding:10px 16px}
  .brand-text strong{font-size:1rem}
  .brand-text em{font-size:.66rem}
  .nav-links{flex:1 1 auto}
  .hero{padding:76px 0 84px}
  .section{padding:64px 0}
  .cards,.people,.member-list,.stats{grid-template-columns:1fr}
  .contact dl{grid-template-columns:1fr;gap:4px 0}
  .contact dt{margin-top:14px}
  .hero-cta .btn{flex:1 1 100%;text-align:center}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
  .btn:hover,.card:hover{transform:none}
}

@media print{
  .nav,.hero-cta,.menu-toggle,.lang-toggle,.skip{display:none}
  body{background:#fff;color:#000}
  .section{padding:24px 0;break-inside:avoid}
}