/* JYP-Research Team — Sustainable Plastics Lab.
   외부 폰트/CDN을 쓰지 않음 (중국 접속 시 로딩 지연 방지) */
:root{
  --ink:#16201b; --ink-2:#44524a; --muted:#6b7a71;
  --bg:#ffffff; --bg-2:#f3f6f2; --line:#dfe6e0;
  --green:#1d5c3f; --green-2:#2f7d57; --green-soft:#e3efe7;
  --gold:#b7791f; --gold-soft:#fbf1df;
  --radius:14px; --shadow:0 1px 2px rgba(16,32,24,.06),0 6px 24px rgba(16,32,24,.06);
  --font:"Pretendard","Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic","Segoe UI",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:900px}
.muted{color:var(--muted)}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:20px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-logo{height:44px;width:auto;border-radius:8px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{font-size:17px;letter-spacing:-.01em}
.brand-text small{font-size:12px;color:var(--muted)}
.nav{margin-left:auto}
.nav>ul{display:flex;gap:2px;list-style:none;margin:0;padding:0}
.nav li{position:relative}
.nav>ul>li>a{display:block;padding:10px 13px;border-radius:9px;color:var(--ink-2);font-weight:600;font-size:15px}
.nav>ul>li>a:hover,.nav>ul>li.active>a{background:var(--green-soft);color:var(--green);text-decoration:none}
.nav .sub{position:absolute;top:100%;left:0;min-width:240px;list-style:none;margin:0;padding:8px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(4px);transition:.15s}
.nav li.has-sub:hover .sub,.nav li.has-sub:focus-within .sub{opacity:1;visibility:visible;transform:none}
.nav .sub a{display:block;padding:8px 12px;border-radius:8px;color:var(--ink-2);font-size:14px}
.nav .sub a:hover,.nav .sub a.on{background:var(--bg-2);color:var(--green);text-decoration:none}
.menu-btn{display:none;margin-left:auto;font-size:22px;background:none;border:1px solid var(--line);border-radius:10px;width:44px;height:40px;cursor:pointer}

/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,#f4f8f3 0%,#e6f0e8 55%,#f7f1e4 100%);border-bottom:1px solid var(--line)}
.hero-in{display:grid;grid-template-columns:1.4fr .8fr;gap:40px;align-items:center;padding:72px 24px 64px}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--green-2);margin:0 0 10px}
.hero h1{font-size:clamp(34px,5vw,56px);line-height:1.08;letter-spacing:-.025em;margin:0 0 18px;color:var(--green)}
.lead{font-size:19px;color:var(--ink-2);margin:0 0 10px;max-width:40em}
.pi{font-weight:600;color:var(--ink);margin:0 0 26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px}
.btn{display:inline-block;padding:11px 18px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:600;font-size:15px}
.btn:hover{text-decoration:none;border-color:var(--green-2)}
.btn.primary{background:var(--green);border-color:var(--green);color:#fff}
.btn.primary:hover{background:var(--green-2)}
.hero-mark{display:flex;justify-content:center}
.hero-mark img{max-height:260px;width:auto;border-radius:20px;background:#fff;padding:18px;box-shadow:var(--shadow)}

/* ---------- notice ---------- */
.notice{background:var(--gold-soft);border-bottom:1px solid #f1dfbd}
.notice .wrap{display:flex;gap:16px;align-items:flex-start;padding-top:16px;padding-bottom:16px}
.notice p{margin:0;font-size:15px;color:#5a4316}
.tag{flex:none;background:var(--gold);color:#fff;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;margin-top:2px}

/* ---------- sections ---------- */
.block{padding:64px 0}
.block.alt{background:var(--bg-2)}
.sec{font-size:24px;letter-spacing:-.015em;margin:0 0 20px;color:var(--ink)}
.sec-row{display:flex;justify-content:space-between;align-items:baseline;gap:16px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.big{font-size:17px;color:var(--ink-2)}
.more{font-weight:600}
.page-head{background:linear-gradient(135deg,#f4f8f3,#e6f0e8);border-bottom:1px solid var(--line);padding:44px 0 36px}
.page-head h1{margin:0;font-size:clamp(28px,4vw,40px);letter-spacing:-.02em;color:var(--green)}
.crumb{margin:0 0 6px;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--green-2)}
.page-head .sub{margin:10px 0 0;color:var(--ink-2);max-width:60em}

.topics{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:10px}
.topics li{display:flex;gap:14px;align-items:baseline;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;font-weight:500}
.topics span{font-weight:800;color:var(--green-2);font-variant-numeric:tabular-nums}

.news-cards{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.news-cards li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.news-cards time,.news-list time{font-size:13px;font-weight:700;color:var(--green-2);font-variant-numeric:tabular-nums}
.news-cards p{margin:6px 0 8px;font-size:15px}

.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.quick a{display:flex;flex-direction:column;gap:4px;padding:22px;border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);background:#fff;transition:.15s}
.quick a:hover{text-decoration:none;border-color:var(--green-2);transform:translateY(-2px);box-shadow:var(--shadow)}
.quick strong{font-size:18px;color:var(--green)}
.quick span{font-size:14px;color:var(--muted)}

.link-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.plain{margin:0 0 28px;padding-left:20px}
.plain li{margin:4px 0}

/* ---------- news list ---------- */
.news-list{list-style:none;margin:0;padding:0}
.news-list li{display:grid;grid-template-columns:120px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}

/* ---------- papers ---------- */
.search{width:100%;padding:13px 16px;border:1px solid var(--line);border-radius:12px;font-size:16px;margin-bottom:32px;font-family:inherit}
.search:focus{outline:2px solid var(--green-2);border-color:transparent}
.papers{list-style:none;margin:0 0 40px;padding:0}
.paper{display:grid;grid-template-columns:64px 1fr;gap:12px;padding:18px 0;border-bottom:1px solid var(--line)}
.toc{max-width:320px;border:1px solid var(--line);border-radius:10px;margin:0 0 10px}
.pno{font-weight:800;color:var(--green-2);font-variant-numeric:tabular-nums}
.paper h3{margin:0 0 6px;font-size:17px;line-height:1.45}
.paper h3 a{color:var(--ink)}
.paper h3 a:hover{color:var(--green)}
.authors{margin:0 0 4px;font-size:14px;color:var(--ink-2)}
.journal{margin:0 0 4px;font-size:14px;color:var(--muted)}
.ifi{margin:0 0 4px;font-size:13px;color:var(--muted)}
.ifi.star{color:var(--gold)}
.tags{margin:6px 0 0;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.badge{display:inline-block;font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--green-soft);color:var(--green)}
.badge.gold{background:var(--gold-soft);color:#8a5a12}
.doi{font-size:13px}
.year{font-size:18px;color:var(--green-2);margin:24px 0 0}

/* ---------- people ---------- */
.people{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:20px}
.person{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.person .ph{aspect-ratio:4/5;background:var(--bg-2)}
.person .ph img{width:100%;height:100%;object-fit:cover}
.person .pb{padding:16px 18px}
.person h3{margin:0 0 6px;font-size:17px}
.person p{margin:2px 0;font-size:14px;color:var(--ink-2)}
.person .mail{color:var(--muted)}
.person .topic{margin-top:8px;font-weight:600;color:var(--green)}
.person .org{font-weight:600}
.person .nick{font-style:italic;color:var(--gold)}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin:0;padding:0}
.chips li{background:#fff;border:1px solid var(--line);padding:8px 14px;border-radius:999px}
.cols{columns:3;column-gap:32px;margin:0 0 16px;padding-left:20px}
.cols li{margin:4px 0;break-inside:avoid}

/* ---------- advisor ---------- */
.pi-grid{display:grid;grid-template-columns:300px 1fr;gap:48px;align-items:start}
.pi-card{position:sticky;top:96px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.pi-card img{border-radius:10px;margin-bottom:14px}
.pi-card h2{font-size:19px;margin:0 0 12px}
.pi-card h3{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--green-2);margin:12px 0 4px}
.pi-card p{margin:2px 0;font-size:14px}
.timeline{display:grid;grid-template-columns:170px 1fr;gap:8px 20px;margin:0 0 32px}
.timeline dt{font-weight:700;color:var(--green-2);font-variant-numeric:tabular-nums}
.timeline dd{margin:0}

/* ---------- hall of fame ---------- */
.fame{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px}
.fame article{background:#fff;border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.fame-head{margin:0 0 6px;font-size:13px;font-weight:800;color:var(--gold);text-transform:uppercase;letter-spacing:.04em}
.fame h3{margin:0 0 6px;font-size:16px;line-height:1.45}

/* ---------- photos ---------- */
.photos{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.photo{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.photo img{width:100%;aspect-ratio:4/3;object-fit:cover;background:var(--bg-2)}
.photo figcaption{padding:12px 16px;font-size:14px;color:var(--ink-2)}
.figure{margin:0 0 32px}
.figure img{border-radius:var(--radius);border:1px solid var(--line)}
.figure figcaption{margin-top:10px;font-weight:600;color:var(--ink-2)}
.fig-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.cites{padding-left:20px}
.cites li{margin:0 0 12px;color:var(--ink-2)}

/* ---------- lecture / contact ---------- */
.terms{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:18px}
.terms article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.terms h3{margin:0 0 8px;color:var(--green)}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.kv{display:grid;grid-template-columns:150px 1fr;gap:10px 16px;margin:0}
.kv dt{font-weight:700;color:var(--green-2)}
.kv dd{margin:0}

/* ---------- footer ---------- */
.footer{background:#12251c;color:#cfe0d5;padding:40px 0;font-size:14px}
.footer-in{display:grid;grid-template-columns:1fr 2fr;gap:32px}
.footer strong{color:#fff}
.footer .muted{color:#9db5a7}
.footer p{margin:0 0 6px}

/* ---------- mobile ---------- */
@media (max-width:980px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);max-height:calc(100vh - 72px);overflow:auto}
  .nav-open .nav{display:block}
  .nav>ul{flex-direction:column;padding:12px 16px}
  .nav .sub{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 6px 12px}
  .hero-in,.two,.pi-grid,.footer-in,.fig-grid{grid-template-columns:1fr}
  .hero-mark{display:none}
  .news-cards{grid-template-columns:1fr}
  .quick{grid-template-columns:1fr 1fr}
  .pi-card{position:static}
  .cols{columns:1}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  .block{padding:44px 0}
  .quick{grid-template-columns:1fr}
  .news-list li{grid-template-columns:1fr;gap:2px}
  .paper{grid-template-columns:1fr;gap:2px}
  .timeline,.kv{grid-template-columns:1fr;gap:2px}
  .timeline dd,.kv dd{margin-bottom:10px}
  .brand-text small{display:none}
}

.yearbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0 0 28px}
.yearbar a{display:flex;flex-direction:column;align-items:center;min-width:84px;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}
.yearbar a:hover{border-color:var(--green-2);text-decoration:none}
.yearbar strong{font-size:18px;color:var(--green);font-variant-numeric:tabular-nums}
.yearbar span{font-size:12px;color:var(--muted)}
.ytotal{font-weight:700;color:var(--ink-2);margin-left:6px}
.ycount{font-size:14px;color:var(--muted);font-weight:600}
.year{scroll-margin-top:90px}

.slideshow{position:relative;aspect-ratio:4/3;max-width:100%;border-radius:18px;overflow:hidden;background:var(--bg-2);box-shadow:var(--shadow)}
.slide{position:absolute;inset:0;margin:0;opacity:0;transition:opacity .9s ease}
.slide.on{opacity:1}
.slide img{width:100%;height:100%;object-fit:cover}
.slide figcaption{position:absolute;left:0;right:0;bottom:0;padding:28px 14px 10px;font-size:13px;color:#fff;background:linear-gradient(transparent,rgba(0,0,0,.65))}
@media (max-width:980px){.hero-in{grid-template-columns:1fr}.slideshow{order:2}}
@media (prefers-reduced-motion:reduce){.slide{transition:none}}

.highlights-block{padding:40px 0 8px}
.carousel{max-width:900px;margin:0 auto;aspect-ratio:16/9;background:#fff;border:1px solid var(--line)}
.carousel .slide img{object-fit:contain}
.dots{position:absolute;left:0;right:0;bottom:12px;display:flex;justify-content:center;gap:8px;z-index:2}
.dots button{width:10px;height:10px;padding:0;border-radius:50%;border:0;background:rgba(0,0,0,.25);cursor:pointer}
.dots button.on{background:var(--green)}