/* ===========================================================
   이문재 교수 홈페이지 — 공용 스타일시트 (v12 고대비 다크 톤)
   =========================================================== */
:root{
  --bg:#060910;--bg-2:#0A1428;
  --panel:rgba(255,255,255,.045);--panel-hover:rgba(255,255,255,.07);
  --ink:#F3F6FC;--ink-2:#B9C3D9;--ink-3:#7C8AA8;
  --line:rgba(255,255,255,.12);--line-soft:rgba(255,255,255,.08);
  --brand:#4C8DFF;--brand-deep:#1E56C7;--brand-dim:rgba(76,141,255,.14);
  --maxw:1180px;
  --sans:"Pretendard Variable",Pretendard,-apple-system,system-ui,sans-serif;
  --serif:"Spectral",Georgia,serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;letter-spacing:-.01em;word-break:keep-all;overflow-wrap:break-word}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}
img{max-width:100%;display:block}

/* ---------- bilingual text (edit the ko/en spans directly in HTML) ---------- */
.lang-en{display:none}
html[lang="en"] .lang-ko{display:none}
html[lang="en"] .lang-en{display:inline}
/* Latin text reads larger than Hangul at the same size, so EN is scaled down
   to keep the same overall visual density/rhythm as the KO layout. */
html[lang="en"]{font-size:91%}
html[lang="en"] .hero--impact .thesis{font-size:clamp(1.9rem,4vw,3rem);letter-spacing:-.008em}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:40;background:rgba(10,20,40,.72);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:flex-start;height:66px;position:relative}
.nav-controls{display:flex;align-items:center;gap:14px;margin-left:auto}
.nav-burger{display:none;flex-direction:column;justify-content:center;gap:5px;width:30px;height:30px;background:none;border:none;cursor:pointer;padding:0}
.nav-burger span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s,opacity .2s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.brand{font-weight:800;font-size:1.06rem;letter-spacing:-.02em;text-decoration:none;color:var(--ink);display:inline-flex;align-items:center}
.brand .en{font-family:var(--serif);font-weight:400;color:var(--ink-3);font-size:.9rem;margin-left:8px;letter-spacing:0}
.brand-logo{height:34px;width:auto;filter:invert(1) brightness(1.15);opacity:.95;transition:opacity .18s}
.brand:hover .brand-logo{opacity:1}
.nav-links{display:flex;align-items:center;gap:24px;margin-left:min(466px, calc(50vw - 124px))}
.nav-links a{color:var(--ink-2);text-decoration:none;font-size:.9rem;font-weight:500;transition:color .18s;white-space:nowrap}
.nav-links a:hover{color:var(--ink)}
.nav-links a[aria-current="page"]{color:var(--brand);font-weight:700}
.lang{border:1px solid var(--line);background:rgba(255,255,255,.03);border-radius:999px;padding:6px 4px;display:inline-flex;gap:2px;font-size:.78rem}
.lang button{border:0;background:transparent;cursor:pointer;font:inherit;color:var(--ink-3);padding:3px 11px;border-radius:999px;font-weight:600;transition:.18s}
.lang button.on{background:var(--brand);color:#fff}
@media(max-width:900px){
  .nav-burger{display:flex}
  .nav-links{position:absolute;top:66px;left:0;right:0;margin-left:0;background:var(--bg-2);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;max-height:0;overflow:hidden;transition:max-height .25s ease}
  .nav-links.open{max-height:70vh;overflow-y:auto}
  .nav-links a{display:block;padding:14px 24px;border-bottom:1px solid var(--line);font-size:1rem}
}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);padding:128px 0 108px;
  background:linear-gradient(180deg,var(--bg-2) 0%,var(--bg) 62%)}
.hero.hero--page{padding:68px 0 54px}
.hero-glow{position:absolute;left:-10%;bottom:-30%;width:520px;height:520px;border-radius:50%;background:rgba(76,141,255,.14);filter:blur(90px);z-index:0}
.hero-glow.hero-glow--top{left:auto;right:-8%;top:-25%;bottom:auto}

/* photo hero (home page only) */
.hero-photo-wrap{position:absolute;inset:0;z-index:0;overflow:hidden}
.hero-photo{position:absolute;right:-6%;top:-4%;bottom:0;width:70%;
  background-image:url('photos/hero-lecture-web.jpg');background-size:cover;background-position:58% 22%;
  filter:grayscale(1) contrast(1.1) brightness(.86);
  -webkit-mask-image:linear-gradient(to right, transparent 0%, rgba(0,0,0,.55) 24%, black 48%);
  mask-image:linear-gradient(to right, transparent 0%, rgba(0,0,0,.55) 24%, black 48%);
}
.hero-photo-tint{position:absolute;inset:0;background:linear-gradient(200deg, rgba(76,141,255,.28), transparent 55%);mix-blend-mode:screen}
.hero-photo-fade-b{position:absolute;left:0;right:0;bottom:0;height:38%;background:linear-gradient(to top, var(--bg), transparent)}
.hero-photo-fade-t{position:absolute;left:0;right:0;top:0;height:22%;background:linear-gradient(to bottom, var(--bg-2), transparent)}

.hero-in{position:relative;z-index:2;max-width:640px}
.hero--impact .wrap.hero-in{margin-left:max(0px, calc(50vw - 516px));margin-right:auto;max-width:700px}
.hero--page .hero-in{max-width:960px}
.eyebrow{font-size:.78rem;font-weight:700;color:var(--brand);display:inline-flex;align-items:center;text-transform:uppercase;letter-spacing:.08em;margin-bottom:30px;padding:8px 16px;border:1px solid rgba(76,141,255,.35);border-radius:4px;background:rgba(76,141,255,.07)}
.hero--page .eyebrow{font-size:.86rem;margin-bottom:22px;padding:9px 18px}
.thesis{font-size:clamp(2.15rem,4.6vw,3.35rem);font-weight:800;line-height:1.28;letter-spacing:-.015em;margin-bottom:28px;color:var(--ink)}
.hero--impact .thesis{font-size:clamp(2.3rem,5.2vw,3.7rem);margin-bottom:24px}
.hero--impact .lede{margin-bottom:0;max-width:34em}
.thesis .hl{color:var(--brand)}
.thesis .josa{font-size:.8em;font-weight:600;letter-spacing:0;opacity:.85}
/* quiet inline emphasis for the site's five core term-of-art phrases (EN copy only) */
html[lang="en"] .term{color:var(--ink);font-weight:600}
.lede{font-size:1.1rem;color:var(--ink-2);max-width:30em;margin-bottom:36px;font-weight:450;line-height:1.7}
.hero--page .lede{margin-bottom:0;max-width:52em}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:600;font-size:.95rem;padding:13px 24px;border-radius:4px;transition:.18s;cursor:pointer;border:0;font-family:inherit}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 28px -8px rgba(76,141,255,.65)}
.btn-primary:hover{background:var(--brand-deep)}
.btn-ghost{background:rgba(255,255,255,.04);color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:rgba(255,255,255,.35)}

@media(max-width:860px){.hero{padding:88px 0 64px}.hero.hero--page{padding:60px 0 46px}.hero-photo{width:88%;right:-10%;opacity:.5}.hero-in{max-width:100%}.hero--impact .wrap.hero-in{max-width:100%}}

/* ---------- generic section head ---------- */
.sec{padding:70px 0 96px}
.sec.sec--tight{padding:50px 0 72px}
.sec-head{max-width:760px;margin-bottom:34px}
.sec-head .lbl{font-size:.8rem;font-weight:600;letter-spacing:.06em;color:var(--brand);text-transform:uppercase}
.sec-head h2{font-size:1.75rem;font-weight:800;letter-spacing:-.03em;margin:8px 0 12px;color:var(--ink)}
.sec-head p{font-size:1rem;color:var(--ink-2);max-width:34em}
.sec-note{font-size:1rem;color:var(--ink-2);max-width:44em;margin-bottom:28px}

/* ---------- research pillars (home) ---------- */
.p-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:28px 22px 30px;transition:.2s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-3px);border-color:rgba(76,141,255,.5);box-shadow:0 18px 40px -20px rgba(76,141,255,.35)}
.card .idx{font-family:var(--serif);font-size:.95rem;color:var(--brand);font-style:italic}
.card h3{font-size:1.12rem;font-weight:800;letter-spacing:-.02em;margin:14px 0 10px;color:var(--ink)}
.card p{font-size:.9rem;color:var(--ink-2);line-height:1.62}
.card::after{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--brand);transition:width .25s}
.card:hover::after{width:100%}
@media(max-width:860px){.p-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.p-grid{grid-template-columns:1fr}}

/* ---------- about ---------- */
.about-layout{display:grid;grid-template-columns:260px 1fr;gap:48px}
@media(max-width:900px){.about-layout{grid-template-columns:1fr;gap:40px}}
.bio-photo{width:100%;max-width:260px;aspect-ratio:1/1.05;border-radius:6px;overflow:hidden;background:var(--panel);border:1px solid var(--line)}
@media(max-width:900px){.bio-photo{max-width:220px}}
.bio-photo img{width:100%;height:100%;object-fit:cover;object-position:center 18%;filter:grayscale(1) contrast(1.06)}
.person-name{font-size:2.1rem;font-weight:800;letter-spacing:-.03em;color:var(--ink);display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.person-name .en{font-family:var(--serif);font-weight:400;font-style:italic;color:var(--ink-3);font-size:1.15rem}
.person-title{display:inline-block;font-family:var(--serif);font-style:italic;font-weight:400;color:var(--brand);font-size:1.05rem;margin:8px 0 26px;text-decoration:none;transition:font-weight .18s}
.person-title:hover{font-weight:600}
.bio-lead{font-size:1.02rem;color:var(--ink-2);line-height:1.75;margin-bottom:20px}
.bio-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{display:inline-flex;align-items:center;font-size:.78rem;font-weight:600;color:var(--brand);background:var(--brand-dim);border:1px solid rgba(76,141,255,.35);border-radius:999px;padding:5px 12px;text-decoration:none;transition:.18s}
a.tag:hover{background:rgba(76,141,255,.24);border-color:rgba(76,141,255,.55)}
.tag.tag--muted{color:var(--ink-3);background:var(--panel);border-color:var(--line)}

.timeline{position:relative;margin-top:8px;padding-left:26px;border-left:1.5px solid var(--line)}
.t-item{position:relative;padding-bottom:26px}
.t-item:last-child{padding-bottom:0}
.t-item::before{content:"";position:absolute;left:-31.5px;top:4px;width:9px;height:9px;border-radius:50%;background:var(--brand);border:2px solid var(--bg)}
.t-item .t-year{font-family:var(--serif);font-size:.86rem;color:var(--brand);font-weight:500;font-style:italic;margin-bottom:3px}
.t-item h4{font-size:.98rem;font-weight:700;margin-bottom:3px;letter-spacing:-.01em;color:var(--ink)}
.t-item p{font-size:.87rem;color:var(--ink-3);line-height:1.6}
.t-item p.placeholder{color:#5C6785;font-style:italic}

.subhead{font-size:1.1rem;font-weight:800;letter-spacing:-.02em;margin:44px 0 18px;color:var(--ink)}
.subhead:first-child{margin-top:0}
.term-head{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin:36px 0 14px}
.sec-head + .term-head{margin-top:0}

/* ---------- publications ---------- */
.pub-list{list-style:none}
.pub-item{padding:13px 0;border-bottom:1px dashed var(--line);display:flex;gap:14px;align-items:baseline;flex-wrap:wrap}
.pub-item:last-child{border-bottom:0}
.pub-item .p-title{font-size:.92rem;font-weight:600;color:var(--ink);text-decoration:none}
a.p-title:hover{color:var(--brand);text-decoration:underline}
.pub-item .p-meta{font-size:.8rem;color:var(--ink-3)}
.pub-item .p-meta strong{color:var(--ink-2);font-weight:700}
.pub-item .p-meta em{font-style:italic}

.book-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:860px){.book-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.book-grid{grid-template-columns:1fr}}
.book-card{display:block}
.book-cover{display:block;aspect-ratio:2/2.75;border-radius:4px;overflow:hidden;border:1px solid var(--line);margin-bottom:12px;background:var(--panel);transition:border-color .18s}
.book-cover:hover{border-color:rgba(76,141,255,.55)}
.book-cover img{width:100%;height:100%;object-fit:cover;filter:saturate(.5) brightness(.87) contrast(1.03);transition:transform .25s,filter .25s}
.book-cover:hover img{transform:scale(1.04);filter:saturate(.85) brightness(.96) contrast(1.03)}
.book-card h4{font-size:.95rem;font-weight:700;color:var(--ink);line-height:1.4;margin-bottom:5px}
.book-card p{font-size:.8rem;color:var(--ink-3);line-height:1.5}

/* ---------- projects ---------- */
.proj-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
@media(max-width:760px){.proj-grid{grid-template-columns:1fr}}
.proj-card:last-child:nth-child(odd){grid-column:1/-1}
.proj-card{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:26px;transition:.2s}
.proj-card:hover{transform:translateY(-3px);border-color:rgba(76,141,255,.5);box-shadow:0 18px 40px -20px rgba(76,141,255,.35)}
.proj-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px}
.proj-card h3{font-size:1.05rem;font-weight:800;letter-spacing:-.02em;line-height:1.4;color:var(--ink)}
.status{flex:none;font-size:.72rem;font-weight:700;padding:4px 10px;border-radius:999px;white-space:nowrap}
.status.on{background:rgba(52,199,109,.16);color:#5FDB8D}
.status.done{background:var(--panel);color:var(--ink-3);border:1px solid var(--line)}
.status.tbd{background:transparent;color:#5C6785;border:1px dashed var(--line);font-weight:600}
.proj-card.placeholder-card{border-style:dashed}
.proj-card .p-role{font-size:.8rem;color:var(--brand);font-weight:600;margin-bottom:8px}
.proj-card p{font-size:.88rem;color:var(--ink-2);line-height:1.6}

.proj-detail{margin-top:14px;padding-top:14px;border-top:1px dashed var(--line)}
.proj-detail summary{cursor:pointer;font-size:.85rem;font-weight:600;color:var(--brand);list-style:none}
.proj-detail summary::-webkit-details-marker{display:none}
.proj-detail summary::after{content:" ▾";font-weight:400}
.proj-detail[open] summary::after{content:" ▴"}
.proj-diagram-grid{margin-top:14px;display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:600px){.proj-diagram-grid{grid-template-columns:1fr}}
.proj-diagram{border:1px dashed var(--line);border-radius:4px;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;text-align:center;padding:14px;color:#5C6785;font-size:.78rem;font-style:italic;background:rgba(255,255,255,.02);overflow:hidden;transition:border-color .18s}
.proj-diagram img{width:100%;height:100%;object-fit:contain;border-radius:3px}
.proj-diagram .lang-ko,.proj-diagram .lang-en{display:none}
.proj-diagram .lang-ko{display:block}
html[lang="en"] .proj-diagram .lang-ko{display:none}
html[lang="en"] .proj-diagram .lang-en{display:block}
.proj-diagram.has-img{cursor:zoom-in}
.proj-diagram.has-img:hover{border-color:rgba(76,141,255,.55)}
.proj-diagram-grid--single{grid-template-columns:1fr;max-width:420px}

.proj-video{margin-top:14px;position:relative;width:100%;aspect-ratio:16/9;border-radius:4px;overflow:hidden;border:1px solid var(--line);background:#000}
.proj-video iframe{width:100%;height:100%;border:0;display:block}

/* ---------- lightbox (project diagrams) ---------- */
.lightbox-overlay{position:fixed;inset:0;background:rgba(4,8,18,.92);z-index:200;display:none;align-items:center;justify-content:center;padding:36px;cursor:zoom-out}
.lightbox-overlay.open{display:flex}
.lightbox-overlay img{max-width:92vw;max-height:88vh;border-radius:4px;box-shadow:0 30px 80px -20px rgba(0,0,0,.6)}
.lightbox-close{position:absolute;top:22px;right:26px;color:#fff;font-size:1.7rem;background:none;border:0;cursor:pointer;line-height:1;padding:6px}

/* ---------- member card (photo-led) ---------- */
.member.photo-card{text-align:center;padding:26px 20px 24px}
.member-photo{width:92px;height:92px;border-radius:50%;overflow:hidden;margin:0 auto 14px;background:var(--panel-hover);border:1px solid var(--line);display:flex;align-items:center;justify-content:center}
.member-photo img{width:100%;height:100%;object-fit:cover;filter:grayscale(1)}
.member-photo .ph-fallback{font-size:.68rem;color:#5C6785;font-style:italic;line-height:1.3;padding:0 8px}
.member-photo .ph-fallback.initials{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-style:normal;font-weight:800;font-size:1.05rem;letter-spacing:.02em;padding:0}
.ph-fallback.initials.c1,.ph-fallback.initials.c2,.ph-fallback.initials.c3,.ph-fallback.initials.c4,.ph-fallback.initials.c5{background:var(--brand-dim);color:var(--brand)}
.member.photo-card h4{font-size:.98rem;font-weight:800;color:var(--ink);letter-spacing:.02em;text-transform:uppercase;margin-bottom:4px}
.member.photo-card .m-degree{font-size:.82rem;color:var(--brand);font-weight:700}
.member.photo-card .m-degree.placeholder{color:#5C6785;font-weight:400}
.member.photo-card h4.placeholder{color:#7A8398;font-weight:700}

/* ---------- teaching ---------- */
.course-list{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line)}
.course-item{display:grid;grid-template-columns:120px 1fr 160px;gap:18px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}
@media(max-width:700px){.course-item{grid-template-columns:1fr;gap:6px;padding:16px 0}}
.course-item .c-code{font-family:var(--serif);font-style:italic;color:var(--brand);font-size:.88rem}
.course-item h4{font-size:.96rem;font-weight:700;letter-spacing:-.01em;color:var(--ink)}
.course-item .c-desc{font-size:.83rem;color:var(--ink-3);margin-top:3px}
.course-item .c-level{font-size:.78rem;color:var(--ink-3);text-align:right}
@media(max-width:700px){.course-item .c-level{text-align:left}}

.term-panel{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:2px 24px;margin-bottom:16px}
.term-panel:last-child{margin-bottom:0}
.course-row{display:flex;align-items:center;gap:12px;padding:16px 0;border-bottom:1px dashed var(--line)}
.course-row:last-child{border-bottom:0}
.course-row::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);flex:none}
.course-row .p-title{font-size:.95rem;font-weight:700;color:var(--ink)}

.lab-box{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:28px;margin-top:10px}
.lab-box h3{font-size:1.05rem;font-weight:800;margin-bottom:10px;color:var(--ink)}
.lab-box p{font-size:.92rem;color:var(--ink-2);line-height:1.7}

.member-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
@media(max-width:860px){.member-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.member-grid{grid-template-columns:1fr}}
.member-grid.member-grid--few{grid-template-columns:repeat(auto-fit,minmax(200px,320px));justify-content:center}
.member{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:22px}
.member .m-role{font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--brand);margin-bottom:8px}
.member h4{font-size:.98rem;font-weight:800;color:var(--ink);letter-spacing:-.01em;margin-bottom:6px}
.member .m-major{font-size:.83rem;color:var(--ink-2);margin-bottom:4px}
.member .m-area{font-size:.8rem;color:var(--ink-3);line-height:1.55}
.member.alum{opacity:.88}
.member .m-role.alum-lbl{color:var(--ink-3)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:760px){.contact-grid{grid-template-columns:1fr}}
.contact-card{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:26px}
.contact-card.primary{border-color:rgba(76,141,255,.4);background:linear-gradient(160deg,rgba(76,141,255,.1),var(--panel))}
.contact-card .c-lbl{font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--brand);margin-bottom:10px}
.contact-card h3{font-size:1.05rem;font-weight:800;margin-bottom:10px;letter-spacing:-.01em;color:var(--ink)}
.contact-card p{font-size:.9rem;color:var(--ink-2);line-height:1.65;margin-bottom:6px}
.contact-card a.clink{color:var(--brand);font-weight:600;text-decoration:none}
.contact-card a.clink:hover{text-decoration:underline}
.contact-card p.placeholder{color:#5C6785;font-style:italic}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:22px 0;color:var(--ink-3);font-size:.84rem}
.foot-in{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.note{background:var(--bg-2);border:1px dashed rgba(255,255,255,.25);color:var(--ink-3);font-size:.8rem;text-align:center;padding:9px}