/* ============================================================
   학교리모델링 · 주식회사 고신(KOSIN)
   Faithful to detroit.paris — pure monochrome on BLACK, oversized
   condensed uppercase display type, tight edge-to-edge image
   mosaics, minimal hairline chrome, slow reveals.
   ============================================================ */

:root{
  --bg:#000000;
  --bg-2:#0C0C0C;
  --fg:#F4F2ED;          /* near-white */
  --dim:#8E8A82;         /* muted grey */
  --line:rgba(244,242,237,.16);
  --gap:8px;
  --nav-h:70px;
  --ease:cubic-bezier(.19,1,.22,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--fg);
  font-family:"Barlow","Pretendard","Apple SD Gothic Neo",system-ui,sans-serif;
  font-size:1.03rem;line-height:1.6;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--fg);color:var(--bg)}

/* ---------- type ---------- */
.eng-d{font-family:"Anton",sans-serif;text-transform:uppercase;line-height:.86;letter-spacing:-.005em;font-weight:400}
.kor-d{font-family:"Black Han Sans",sans-serif;font-weight:400;line-height:.9;letter-spacing:-.01em}
.kicker{font-family:"Anton",sans-serif;text-transform:uppercase;letter-spacing:.26em;font-size:.7rem;color:var(--dim)}

/* ---------- layout ---------- */
.wrap{width:min(1560px,94vw);margin-inline:auto}
.wrap-narrow{width:min(900px,90vw);margin-inline:auto}
.pad{padding-block:clamp(64px,9vw,150px)}
.rule{height:1px;background:var(--line);width:100%}

/* ---------- nav ---------- */
.nav{position:fixed;inset:0 0 auto 0;height:var(--nav-h);z-index:100;display:flex;align-items:center;
  transition:background .5s var(--ease),border-color .5s var(--ease);border-bottom:1px solid transparent;mix-blend-mode:normal}
.nav .wrap{display:flex;align-items:center;justify-content:space-between}
.nav.solid{background:rgba(0,0,0,.72);backdrop-filter:blur(12px);border-color:var(--line)}
.brand{display:flex;align-items:center;gap:.55rem;font-family:"Anton",sans-serif;letter-spacing:.02em;font-size:1.05rem}
.brand .dot{width:26px;height:26px;border-radius:50%;background:var(--fg);color:var(--bg);display:grid;place-items:center;font-family:"Black Han Sans";font-size:.82rem;line-height:1}
.brand b{font-weight:400}
.brand span{font-size:.6rem;letter-spacing:.28em;color:var(--dim);text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:clamp(.9rem,1.8vw,1.9rem)}
.nav-links a{font-family:"Anton",sans-serif;text-transform:uppercase;letter-spacing:.08em;font-size:.74rem;position:relative;padding-block:.4rem;white-space:nowrap;color:var(--fg)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:.05rem;width:0;height:1px;background:currentColor;transition:width .4s var(--ease)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{border:1px solid var(--fg);border-radius:100px;padding:.45rem 1rem !important;font-size:.68rem !important;transition:background .35s,color .35s}
.nav-cta::after{display:none}
.nav-cta:hover{background:var(--fg);color:var(--bg)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px;color:var(--fg)}
.burger span{width:26px;height:2px;background:currentColor;transition:.35s var(--ease)}
.mobile-menu{position:fixed;inset:0;background:var(--bg);z-index:99;display:flex;flex-direction:column;justify-content:center;gap:.3rem;padding:0 7vw;transform:translateY(-100%);transition:transform .6s var(--ease);visibility:hidden;border-bottom:1px solid var(--line)}
.mobile-menu.open{transform:translateY(0);visibility:visible}
.mobile-menu a{font-family:"Black Han Sans",sans-serif;font-size:2rem;line-height:1.25}
.mobile-menu a small{font-family:"Anton";font-size:.68rem;letter-spacing:.22em;color:var(--dim);display:block;margin-bottom:-.15rem}

/* ---------- HERO (cinematic split: type left · dense mosaic right) ---------- */
.hero-d{min-height:100svh;display:grid;grid-template-columns:43fr 57fr;gap:var(--gap);
  padding:calc(var(--nav-h) + 6px) 6px 6px;background:var(--bg)}
.hero-type{display:flex;flex-direction:column;justify-content:center;
  padding:clamp(20px,2vw,40px) clamp(14px,2.2vw,46px)}
.hero-type .kick{display:flex;align-items:center;gap:.9rem;font-family:"Anton",sans-serif;text-transform:uppercase;
  letter-spacing:.22em;font-size:clamp(.66rem,.82vw,.78rem);color:var(--dim);margin-bottom:clamp(1rem,1.8vw,1.7rem)}
.hero-type .kick i{font-style:normal;color:var(--bg);background:var(--fg);padding:.32rem .6rem;letter-spacing:.14em}
.hero-type h1{font-family:"Black Han Sans",sans-serif;font-weight:400;line-height:.88;letter-spacing:-.02em;
  font-size:clamp(3.2rem,7.6vw,8rem);white-space:nowrap}
.hero-type .cap{max-width:42ch;color:var(--dim);font-size:clamp(.94rem,1.02vw,1.1rem);line-height:1.6;
  margin-top:clamp(1.1rem,1.8vw,1.7rem)}
.hero-type .cap b{color:var(--fg);font-weight:600}
.hero-actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:clamp(1.6rem,2.6vw,2.4rem)}
.hbtn{display:inline-flex;align-items:center;gap:.55rem;font-family:"Anton";text-transform:uppercase;letter-spacing:.08em;
  font-size:.8rem;border:1px solid var(--line);border-radius:100px;padding:.85rem 1.5rem;color:var(--fg);transition:.4s var(--ease)}
.hbtn b{font-weight:400;letter-spacing:.03em}
.hbtn span{transition:transform .4s var(--ease)}
.hbtn:hover{border-color:var(--fg)}.hbtn:hover span{transform:translateY(3px)}
.hbtn.solid{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.hbtn.solid:hover{background:transparent;color:var(--fg);border-color:var(--fg)}

.hero-mosaic{display:grid;grid-template-columns:1fr 1fr 1fr;grid-template-rows:1fr 1fr;gap:var(--gap);min-height:0}
.hmos{position:relative;overflow:hidden;background:var(--bg-2);min-height:0}
.hmos img{width:100%;height:100%;object-fit:cover;filter:grayscale(.12) contrast(1.04);transition:transform 1.3s var(--ease),filter .7s}
.hmos:hover img{transform:scale(1.05);filter:grayscale(0)}
.hmos .cap{position:absolute;left:0;right:0;bottom:0;padding:.75rem .85rem;font-family:"Anton";font-size:.6rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--fg);background:linear-gradient(transparent,rgba(0,0,0,.72));
  opacity:0;transform:translateY(6px);transition:.45s var(--ease)}
.hmos:hover .cap{opacity:1;transform:none}
.hmA{grid-area:1/1/2/3}.hmB{grid-area:1/3/3/4}.hmC{grid-area:2/1/3/2}.hmD{grid-area:2/2/3/3}

/* ---------- subpage hero (image + dark type) ---------- */
.hero{min-height:88svh;display:flex;flex-direction:column;justify-content:flex-end;padding-top:var(--nav-h);position:relative;overflow:hidden}
.hero-inner{width:min(1560px,94vw);margin-inline:auto;padding-bottom:clamp(26px,4vw,56px);position:relative;z-index:2}
.hero-media{position:absolute;inset:0;z-index:1}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.35) 0%,rgba(0,0,0,.15) 35%,rgba(0,0,0,.85) 100%)}
.hero-media img{width:100%;height:100%;object-fit:cover;filter:grayscale(.25) contrast(1.04)}
.hero .en{display:block;font-family:"Anton";text-transform:uppercase;line-height:.9;color:var(--dim);font-size:clamp(1rem,3vw,2.4rem)}
.hero h1{font-family:"Black Han Sans",sans-serif;font-weight:400;line-height:.88;letter-spacing:-.01em;font-size:clamp(3rem,12vw,10rem);margin:.05em 0}
.hero .sub{max-width:46ch;margin-top:1.2rem;font-size:clamp(1rem,1.3vw,1.2rem);color:var(--fg)}
.crumb{font-family:"Anton";text-transform:uppercase;letter-spacing:.14em;font-size:.7rem;color:var(--dim)}
.crumb a:hover{color:var(--fg)}

/* ---------- statement ---------- */
.statement{font-family:"Black Han Sans",sans-serif;font-weight:400;line-height:1.02;letter-spacing:-.01em;font-size:clamp(1.9rem,5.6vw,5rem)}
.statement .thin{color:var(--dim)}
.lead{font-size:clamp(1.02rem,1.4vw,1.3rem);max-width:60ch;color:var(--dim)}
.eyebrow{display:flex;align-items:center;gap:1rem;margin-bottom:2rem}
.eyebrow .num{font-family:"Anton";font-size:.72rem;letter-spacing:.18em;color:var(--fg)}
.eyebrow .ln{flex:1;height:1px;background:var(--line);max-width:120px}
.eyebrow .kicker{margin-left:auto}

/* ---------- marquee ---------- */
.marquee{border-block:1px solid var(--line);padding-block:1rem;overflow:hidden;white-space:nowrap}
.marquee-track{display:inline-flex;gap:2.6rem;animation:scroll-x 28s linear infinite;will-change:transform}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee span{font-family:"Anton",sans-serif;text-transform:uppercase;font-size:clamp(1.3rem,2.8vw,2.3rem);color:var(--fg);display:inline-flex;align-items:center;gap:2.6rem;letter-spacing:.01em}
.marquee span::after{content:"—";color:var(--dim)}
@keyframes scroll-x{to{transform:translateX(-50%)}}

/* ---------- projects mosaic ---------- */
.grid-projects{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap)}
.pcard{position:relative;overflow:hidden;cursor:pointer;background:var(--bg-2)}
.pcard img{width:100%;height:100%;object-fit:cover;transition:transform 1.1s var(--ease),filter .6s;filter:grayscale(.24)}
.pcard:hover img{transform:scale(1.05);filter:grayscale(0)}
.pcard .meta{position:absolute;left:0;right:0;bottom:0;padding:1rem 1.1rem;background:linear-gradient(transparent,rgba(0,0,0,.78));transform:translateY(6px);opacity:0;transition:.5s var(--ease)}
.pcard:hover .meta{transform:translateY(0);opacity:1}
.pcard .meta b{font-family:"Anton";text-transform:uppercase;letter-spacing:.02em;font-weight:400;font-size:1rem;display:block}
.pcard .meta small{font-size:.72rem;color:var(--dim);letter-spacing:.03em}
.pcard .tag{position:absolute;top:10px;left:10px;background:var(--fg);color:var(--bg);font-family:"Anton";font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;padding:.28rem .55rem;z-index:2}
.c3{grid-column:span 3}.c4{grid-column:span 4}.c5{grid-column:span 5}.c6{grid-column:span 6}.c7{grid-column:span 7}.c8{grid-column:span 8}
.r-tall{aspect-ratio:3/4}.r-wide{aspect-ratio:16/10}.r-sq{aspect-ratio:1/1}.r-big{aspect-ratio:4/3}

/* ---------- levels ---------- */
.levels{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0;border-top:1px solid var(--line)}
.level{display:block;padding:2.2rem 1.5rem 2rem;border-bottom:1px solid var(--line);border-right:1px solid var(--line);position:relative;transition:background .45s var(--ease),color .45s var(--ease);overflow:hidden}
.level:hover{background:var(--fg);color:var(--bg)}
.level .no{font-family:"Anton";font-size:.72rem;letter-spacing:.2em;color:var(--dim)}
.level h3{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:clamp(1.5rem,2.3vw,2.1rem);line-height:1.02;margin:.85rem 0 .45rem}
.level .eng{font-family:"Anton";text-transform:uppercase;letter-spacing:.14em;font-size:.66rem;color:var(--dim)}
.level:hover .eng,.level:hover .no{color:#555}
.level .go{position:absolute;top:2.2rem;right:1.5rem;font-size:1.3rem;transition:transform .45s var(--ease)}
.level:hover .go{transform:translate(4px,-4px)}
.level p{margin-top:.9rem;font-size:.9rem;color:var(--dim)}
.level:hover p{color:#444}

/* ---------- process ---------- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:clamp(20px,2.6vw,44px)}
.step .n{font-family:"Anton";font-size:2.5rem;line-height:1;color:var(--fg)}
.step h4{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:1.3rem;margin:.8rem 0 .45rem}
.step p{color:var(--dim);font-size:.92rem}
.step{padding-top:1.4rem;border-top:2px solid var(--fg)}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:clamp(20px,2.6vw,38px)}
.stat .big{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:clamp(2.6rem,6vw,5rem);line-height:1;letter-spacing:-.02em}
.stat .big i{font-style:normal;color:var(--dim)}
.stat p{font-family:"Anton";text-transform:uppercase;letter-spacing:.14em;font-size:.72rem;color:var(--dim);margin-top:.5rem}

/* ---------- CTA ---------- */
.cta{background:var(--fg);color:var(--bg)}
.cta .kicker,.cta .eng{color:#555}
.cta h2{font-family:"Black Han Sans",sans-serif;font-weight:400;line-height:.94;font-size:clamp(2.4rem,8.5vw,7rem)}
.cta .eng{font-family:"Anton";text-transform:uppercase;letter-spacing:.16em;font-size:.8rem}
.btn{display:inline-flex;align-items:center;gap:.7rem;font-family:"Anton";text-transform:uppercase;letter-spacing:.1em;font-size:.84rem;border:1px solid currentColor;border-radius:100px;padding:.95rem 1.7rem;transition:background .4s var(--ease),color .4s var(--ease)}
.cta .btn:hover{background:var(--bg);color:var(--fg)}
.btn.solid{background:var(--bg);border-color:var(--bg);color:var(--fg)}
.btn.solid:hover{background:transparent;color:var(--bg)}
.phone-xl{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:clamp(2rem,5vw,3.4rem);letter-spacing:.01em}

/* ---------- footer ---------- */
.foot{background:var(--bg);color:var(--dim);padding-block:clamp(38px,5vw,68px);font-size:.88rem;border-top:1px solid var(--line)}
.foot .top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2rem;padding-bottom:2.2rem;border-bottom:1px solid var(--line)}
.foot .brand-lg{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:clamp(1.8rem,4vw,3rem);color:var(--fg);line-height:.95}
.foot a:hover{color:var(--fg)}
.foot-links{display:flex;gap:1.3rem;flex-wrap:wrap;font-family:"Anton";text-transform:uppercase;letter-spacing:.09em;font-size:.72rem}
.foot .bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;padding-top:1.6rem;font-size:.76rem;color:#6b6862}
.foot .biz{max-width:66ch;line-height:1.9}

/* ---------- gallery / lightbox ---------- */
.gallery{columns:3;column-gap:var(--gap)}
.gallery figure{break-inside:avoid;margin-bottom:var(--gap);position:relative;overflow:hidden;cursor:zoom-in;background:var(--bg-2)}
.gallery img{width:100%;transition:transform 1s var(--ease),filter .6s;filter:grayscale(.22)}
.gallery figure:hover img{transform:scale(1.04);filter:grayscale(0)}
.gallery figcaption{position:absolute;left:0;bottom:0;right:0;padding:.85rem 1rem;background:linear-gradient(transparent,rgba(0,0,0,.8));color:var(--fg);font-family:"Anton";text-transform:uppercase;letter-spacing:.06em;font-size:.66rem;opacity:0;transform:translateY(6px);transition:.45s var(--ease)}
.gallery figure:hover figcaption{opacity:1;transform:translateY(0)}
.lb{position:fixed;inset:0;background:rgba(0,0,0,.96);z-index:200;display:none;align-items:center;justify-content:center;padding:4vw}
.lb.open{display:flex}
.lb img{max-width:94vw;max-height:88vh;object-fit:contain}
.lb .x{position:absolute;top:20px;right:24px;color:#fff;font-family:"Anton";font-size:.9rem;letter-spacing:.14em;cursor:pointer;background:none;border:0}
.lb .nav-btn{position:absolute;top:50%;transform:translateY(-50%);color:#fff;font-size:2.4rem;cursor:pointer;background:none;border:0;padding:1rem;opacity:.7;transition:opacity .3s}
.lb .nav-btn:hover{opacity:1}.lb .prev{left:10px}.lb .next{right:10px}
.lb .cap{position:absolute;bottom:18px;left:0;right:0;text-align:center;color:var(--dim);font-family:"Anton";text-transform:uppercase;letter-spacing:.08em;font-size:.72rem}

/* ---------- content ---------- */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,88px);align-items:start}
.feat{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:clamp(18px,2.2vw,38px)}
.feat .item{border-top:1px solid var(--line);padding-top:1.1rem}
.feat .item .k{font-family:"Anton";color:var(--fg);font-size:.78rem;letter-spacing:.14em}
.feat .item h4{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:1.28rem;margin:.55rem 0 .45rem}
.feat .item p{color:var(--dim);font-size:.9rem}
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:0;border-top:1px solid var(--line)}
.related a{padding:1.5rem 1.1rem;border-bottom:1px solid var(--line);border-right:1px solid var(--line);display:flex;align-items:baseline;justify-content:space-between;gap:1rem;transition:background .4s,color .4s}
.related a:hover{background:var(--fg);color:var(--bg)}
.related a b{font-family:"Black Han Sans",sans-serif;font-weight:400;font-size:1.12rem}
.related a span{font-family:"Anton";font-size:.9rem}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(26px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
[data-reveal].in{opacity:1;transform:none}
[data-reveal].d1{transition-delay:.08s}[data-reveal].d2{transition-delay:.16s}[data-reveal].d3{transition-delay:.24s}[data-reveal].d4{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){[data-reveal]{opacity:1 !important;transform:none !important}.marquee-track,.scrollcue i{animation:none !important}}

/* ---------- responsive ---------- */
@media(max-width:1024px){
  .c3,.c4,.c5{grid-column:span 6}.c6,.c7,.c8{grid-column:span 6}
  .gallery{columns:2}.two-col{grid-template-columns:1fr}
  .hero-d{grid-template-columns:1fr;min-height:auto;padding-top:calc(var(--nav-h) + 10px)}
  .hero-type{justify-content:flex-start;padding:clamp(26px,6vw,64px) clamp(14px,3vw,40px) clamp(20px,3vw,34px)}
  .hero-mosaic{height:60vh;min-height:400px}
}
@media(max-width:640px){
  .nav-links{display:none}.burger{display:flex}
  .grid-projects{grid-template-columns:repeat(6,1fr)}
  .c3,.c4,.c5,.c6,.c7,.c8{grid-column:span 6}
  .gallery{columns:1}.foot .top{flex-direction:column}
  .hero-type h1{font-size:clamp(2.7rem,13.5vw,4.4rem)}
  .hero-mosaic{height:auto;grid-template-columns:1fr 1fr;grid-template-rows:50vw 33vw 33vw}
  .hmA{grid-area:1/1/2/3}.hmB{grid-area:2/1/3/2}.hmC{grid-area:2/2/3/3}.hmD{grid-area:3/1/4/3}
}