/* =================================================================
   37TOWER THE FIRST — "PLUMBLINE" 디자인 시스템
   STUDIO PLUMBLINE / 가상 독립 스튜디오
   라이브러리: ScrollMagic (핀드 씬 스크롤텔링)
   레이아웃: 수직 타워 내러티브 (핀 고정 씬)
   톤: 블랙/실버 정밀 — 건메탈 + 콜드 실버 + 단 한 줄의 엠버 측량선
   ================================================================= */

:root{
  --ink:#070809;          /* 거의 검정 */
  --steel:#10151b;        /* 건메탈 패널 */
  --steel-2:#161d26;
  --silver:#cdd6df;       /* 콜드 실버 텍스트 */
  --silver-dim:#7f8a96;
  --silver-faint:#3a434d;
  --line:#222b34;
  --line-soft:#1a222b;
  --ember:#f5611f;        /* 측량 기준선 — 절제된 단 하나의 색 */
  --ember-soft:rgba(245,97,31,.14);
  --white:#f3f6f9;
  --wrap:1180px;
  --gut:clamp(20px,5vw,64px);
  --serif:"Fraunces",Georgia,serif;
  --mono:"Space Mono","SFMono-Regular",ui-monospace,monospace;
  --sans:"Pretendard","Pretendard Variable",system-ui,-apple-system,"Apple SD Gothic Neo",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  background:var(--ink);
  color:var(--silver);
  font-family:var(--sans);
  font-weight:400;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--ember);outline-offset:3px;border-radius:2px}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.mono{font-family:var(--mono);letter-spacing:.04em}
.amber{color:var(--ember)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ---------- 측량 기준선(plumbline) : 전 페이지 우측 수직선 ---------- */
.plumb{
  position:fixed;top:0;right:clamp(14px,4vw,46px);bottom:0;
  width:1px;background:linear-gradient(var(--line),transparent 8%,var(--line) 92%,transparent);
  z-index:60;pointer-events:none;
}
.plumb__bob{
  position:fixed;right:clamp(8px,4vw,40px);top:0;
  width:13px;height:13px;border:1px solid var(--ember);
  transform:translate(0,-50%) rotate(45deg);
  z-index:61;pointer-events:none;
  transition:top .08s linear;
  box-shadow:0 0 0 4px rgba(245,97,31,.08);
}
.plumb__read{
  position:fixed;right:clamp(28px,5vw,64px);top:0;
  transform:translateY(-50%);
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--ember);z-index:61;pointer-events:none;
  transition:top .08s linear;
}
@media (max-width:760px){.plumb,.plumb__bob,.plumb__read{display:none}}

/* ---------- NAV ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:80;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px var(--gut);
  background:linear-gradient(var(--ink),rgba(7,8,9,0));
  transition:background .35s,box-shadow .35s,padding .35s;
}
.nav.solid{background:rgba(7,8,9,.92);backdrop-filter:blur(10px);box-shadow:0 1px 0 var(--line);padding:11px var(--gut)}
.nav__brand{display:flex;align-items:baseline;gap:8px;font-family:var(--mono);font-size:14px;letter-spacing:.18em;color:var(--white)}
.nav__brand b{font-weight:400;color:var(--ember);letter-spacing:.1em}
.nav__menu{display:flex;gap:30px}
.nav__menu a{font-size:13px;letter-spacing:.06em;color:var(--silver-dim);transition:color .25s;position:relative}
.nav__menu a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:1px;background:var(--ember);transition:width .3s}
.nav__menu a:hover{color:var(--white)}
.nav__menu a:hover::after{width:100%}
.nav__cta{font-size:12px;letter-spacing:.1em;padding:10px 18px;border:1px solid var(--line);color:var(--white);transition:.25s}
.nav__cta:hover{border-color:var(--ember);background:var(--ember-soft)}
.nav__burger{display:none;background:none;border:0;width:34px;height:26px;flex-direction:column;justify-content:space-between;padding:4px 0}
.nav__burger span{display:block;height:1.5px;background:var(--silver)}
@media (max-width:900px){
  .nav__menu,.nav__cta{display:none}
  .nav__burger{display:flex}
}

/* drawer */
.drawer{
  position:fixed;inset:0;z-index:90;background:rgba(7,8,9,.98);
  display:flex;flex-direction:column;justify-content:center;gap:8px;
  padding:0 var(--gut);transform:translateX(100%);transition:transform .4s cubic-bezier(.7,0,.2,1);
}
.drawer.open{transform:none}
.drawer a{font-family:var(--serif);font-size:clamp(28px,8vw,46px);color:var(--silver);padding:10px 0;border-bottom:1px solid var(--line-soft)}
.drawer a:hover{color:var(--ember)}
.drawer .x{position:absolute;top:22px;right:24px;background:none;border:0;color:var(--silver);font-size:34px;line-height:1}

/* ---------- scroll progress (top) ---------- */
.prog{position:fixed;top:0;left:0;height:2px;width:0;background:var(--ember);z-index:100}

/* =================================================================
   HERO — 황혼 건메탈 타워. 3초 3요소.
   ================================================================= */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden}
.hero__bg{position:absolute;inset:0;z-index:0}
.hero__img{
  position:absolute;inset:0;
  background:#0b0f14 center/cover no-repeat;
  opacity:0;transform:scale(1.08);
  transition:opacity 1.6s ease,transform 8s ease;
}
.hero__img.has-img{opacity:1;transform:scale(1)}
.hero__grad{position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(7,8,9,.55) 0%,rgba(7,8,9,.15) 38%,rgba(7,8,9,.78) 86%,var(--ink) 100%);}
.hero__vert{position:absolute;inset:0;z-index:1;
  background:linear-gradient(90deg,rgba(7,8,9,.6),transparent 40%);}
.hero__inner{position:relative;z-index:2;width:100%;padding-bottom:clamp(70px,11vh,140px)}
.hero__tag{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.22em;color:var(--ember);margin-bottom:26px}
.hero__tag::before{content:"";width:34px;height:1px;background:var(--ember)}
.hero h1{
  font-family:var(--serif);font-weight:300;
  font-size:clamp(44px,9vw,118px);line-height:.98;letter-spacing:-.02em;
  color:var(--white);margin:0 0 22px;
}
.hero h1 em{font-style:italic;color:var(--ember);font-weight:300}
.hero h1 .blk{font-weight:600}
.hero__sub{max-width:560px;font-size:clamp(15px,2vw,18px);color:var(--silver);margin:0 0 36px}
.hero__row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.hero__facts{display:flex;gap:clamp(20px,4vw,54px);margin-top:48px;flex-wrap:wrap}
.hero__fact b{display:block;font-family:var(--mono);font-size:clamp(22px,3.4vw,36px);color:var(--white);letter-spacing:-.01em}
.hero__fact span{font-size:12px;color:var(--silver-dim);letter-spacing:.06em}
.hero__cue{position:absolute;left:var(--gut);bottom:26px;z-index:3;font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--silver-dim);display:flex;align-items:center;gap:10px}
.hero__cue i{display:block;width:1px;height:40px;background:linear-gradient(var(--ember),transparent);animation:drop 1.8s infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
@media (prefers-reduced-motion:reduce){.hero__cue i{animation:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;font-size:14px;letter-spacing:.04em;padding:15px 26px;transition:.28s;border:1px solid transparent}
.btn svg{width:17px;height:17px}
.btn--ember{background:var(--ember);color:#120a04;font-weight:600}
.btn--ember:hover{background:#ff7536;transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);color:var(--white)}
.btn--ghost:hover{border-color:var(--silver);background:rgba(255,255,255,.04)}

/* =================================================================
   공통 섹션 골격
   ================================================================= */
section{position:relative}
.sec{padding:clamp(90px,14vh,170px) 0}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--ember);display:flex;align-items:center;gap:12px;margin-bottom:20px}
.eyebrow::before{content:attr(data-no);color:var(--silver-faint)}
.h-lead{font-family:var(--serif);font-weight:300;font-size:clamp(30px,5.2vw,62px);line-height:1.04;letter-spacing:-.02em;color:var(--white);margin:0 0 22px}
.h-lead em{font-style:italic;color:var(--ember)}
.lead-p{max-width:620px;font-size:clamp(15px,1.7vw,17px);color:var(--silver-dim)}

/* reveal util (IO-driven) */
.rv{opacity:0;transform:translateY(26px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}.rv.d4{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* =================================================================
   ABOUT — 개요. 좌 서사 / 우 스펙 readout
   ================================================================= */
.about{background:linear-gradient(var(--ink),var(--steel))}
.about__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(40px,7vw,100px);align-items:start}
.about__copy p{font-size:clamp(15px,1.8vw,18px);color:var(--silver);max-width:520px}
.spec-card{border:1px solid var(--line);background:rgba(255,255,255,.012)}
.spec-card__top{padding:18px 22px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--silver-dim)}
.spec-card__top .dot{width:7px;height:7px;border-radius:50%;background:var(--ember);box-shadow:0 0 8px var(--ember)}
.spec-row{display:flex;justify-content:space-between;align-items:baseline;padding:17px 22px;border-bottom:1px solid var(--line-soft)}
.spec-row:last-child{border-bottom:0}
.spec-row dt{font-size:13px;color:var(--silver-dim);letter-spacing:.04em}
.spec-row dd{margin:0;font-family:var(--mono);font-size:15px;color:var(--white);text-align:right}
@media (max-width:860px){.about__grid{grid-template-columns:1fr}}

/* =================================================================
   SCENE — 핀 고정 타워 스크롤텔링 (ScrollMagic 핵심)
   섹션 자체가 길고, 내부 stage가 sticky로 핀.
   ================================================================= */
.tower{background:var(--ink)}
.tower__head{padding-top:clamp(90px,13vh,150px)}
.tower__track{position:relative}
.stage{
  position:sticky;top:0;height:100svh;width:100%;left:0;
  display:grid;grid-template-columns:1fr 1fr;align-items:center;
  overflow:hidden;
}
.stage__visual{position:relative;height:100svh;overflow:hidden}
.stage__layer{
  position:absolute;inset:0;background:#0b0f14 center/cover no-repeat;
  opacity:0;transform:scale(1.1);
  transition:opacity 1s ease,transform 1.4s ease;
}
.stage__layer.on{opacity:1;transform:scale(1)}
.stage__layer::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(7,8,9,.5),transparent 55%)}
.stage__floor{
  position:absolute;left:22px;bottom:22px;z-index:3;
  font-family:var(--mono);color:var(--ember);
  font-size:clamp(40px,8vw,86px);line-height:1;letter-spacing:-.02em;
  text-shadow:0 4px 30px rgba(0,0,0,.6);
}
.stage__floor span{display:block;font-size:12px;letter-spacing:.2em;color:var(--silver-dim);margin-top:8px}
.stage__panel{padding:0 clamp(28px,5vw,72px);position:relative;z-index:2}
.stage__step{position:absolute;opacity:0;transform:translateY(34px);transition:opacity .7s,transform .7s;pointer-events:none;width:min(440px,100%)}
.stage__step.on{opacity:1;transform:none;pointer-events:auto}
.stage__step .no{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--silver-faint);margin-bottom:14px}
.stage__step h3{font-family:var(--serif);font-weight:300;font-size:clamp(26px,3.8vw,46px);line-height:1.08;color:var(--white);margin:0 0 16px}
.stage__step h3 em{font-style:italic;color:var(--ember)}
.stage__step p{font-size:clamp(14px,1.6vw,16px);color:var(--silver-dim);margin:0}
.stage__step .big{display:flex;gap:26px;margin:22px 0 0;flex-wrap:wrap}
.stage__step .big b{display:block;font-family:var(--mono);font-size:clamp(20px,2.6vw,30px);color:var(--ember)}
.stage__step .big small{font-size:11px;color:var(--silver-dim);letter-spacing:.05em}
.stage__rail{position:absolute;left:clamp(28px,5vw,72px);top:50%;transform:translateY(-50%);z-index:4;display:flex;flex-direction:column;gap:14px}
.stage__rail i{width:8px;height:8px;border:1px solid var(--silver-faint);transform:rotate(45deg);transition:.3s}
.stage__rail i.on{border-color:var(--ember);background:var(--ember)}
.tower__spacer{height:380vh} /* 스크롤 길이 = 4 스텝 */
@media (max-width:860px){
  .stage{grid-template-columns:1fr}
  .stage__visual{position:absolute;inset:0;z-index:0}
  .stage__layer::after{background:linear-gradient(180deg,rgba(7,8,9,.45),rgba(7,8,9,.85))}
  .stage__panel{z-index:2;padding-left:46px}
  .stage__floor{font-size:54px}
  .stage__rail{left:18px}
}

/* =================================================================
   SPEC — 제조 특장점 그리드
   ================================================================= */
.feat{background:linear-gradient(var(--ink),var(--steel-2))}
.feat__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:48px}
.feat__cell{background:var(--steel);padding:clamp(28px,3vw,40px);transition:background .3s}
.feat__cell:hover{background:var(--steel-2)}
.feat__cell .n{font-family:var(--mono);font-size:11px;color:var(--silver-faint);letter-spacing:.16em}
.feat__cell b{display:block;font-family:var(--mono);font-size:clamp(26px,3.6vw,40px);color:var(--white);margin:18px 0 8px;letter-spacing:-.01em}
.feat__cell b em{font-style:normal;font-size:.5em;color:var(--ember)}
.feat__cell h4{font-size:15px;color:var(--silver);margin:0 0 8px;font-weight:600}
.feat__cell p{font-size:13.5px;color:var(--silver-dim);margin:0;line-height:1.6}
@media (max-width:860px){.feat__grid{grid-template-columns:1fr 1fr}}
@media (max-width:540px){.feat__grid{grid-template-columns:1fr}}

/* =================================================================
   PREMIUM 7 — 수직 카운트 리스트
   ================================================================= */
.prem{background:var(--ink)}
.prem__list{margin-top:46px;border-top:1px solid var(--line)}
.prem__item{display:grid;grid-template-columns:96px 1fr auto;gap:clamp(16px,3vw,40px);align-items:center;
  padding:clamp(20px,2.4vw,30px) 0;border-bottom:1px solid var(--line);transition:.3s;position:relative}
.prem__item::before{content:"";position:absolute;left:0;bottom:-1px;height:1px;width:0;background:var(--ember);transition:width .5s}
.prem__item:hover::before{width:100%}
.prem__item:hover .prem__no{color:var(--ember)}
.prem__no{font-family:var(--mono);font-size:clamp(22px,3vw,34px);color:var(--silver-faint);transition:.3s}
.prem__t b{display:block;font-family:var(--serif);font-size:clamp(20px,2.6vw,30px);color:var(--white);font-weight:300}
.prem__t span{font-size:13.5px;color:var(--silver-dim)}
.prem__tag{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--silver-faint);text-align:right}
@media (max-width:680px){.prem__item{grid-template-columns:60px 1fr}.prem__tag{display:none}}

/* =================================================================
   LOCATION
   ================================================================= */
.loc{background:linear-gradient(var(--steel),var(--ink))}
.loc__grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(36px,6vw,80px);align-items:center;margin-top:40px}
.loc__img{position:relative;aspect-ratio:4/5;background:#0b0f14 center/cover no-repeat;border:1px solid var(--line)}
.loc__img::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(7,8,9,.5),transparent 50%)}
.loc__pin{position:absolute;left:18px;bottom:16px;z-index:2;font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--silver);background:rgba(7,8,9,.6);padding:7px 12px;border:1px solid var(--line)}
.loc__rows{border-top:1px solid var(--line)}
.loc__r{display:flex;gap:20px;align-items:baseline;padding:18px 0;border-bottom:1px solid var(--line-soft)}
.loc__r .k{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--ember);min-width:78px}
.loc__r .v b{color:var(--white);font-weight:600}
.loc__r .v{color:var(--silver-dim);font-size:14.5px}
.loc__note{margin-top:22px;font-size:12.5px;color:var(--silver-faint);font-family:var(--mono);letter-spacing:.02em}
@media (max-width:760px){.loc__grid{grid-template-columns:1fr}}

/* =================================================================
   REGISTER — 관심 등록 폼
   ================================================================= */
.reg{background:radial-gradient(120% 80% at 80% 0%,rgba(245,97,31,.08),transparent 60%),var(--steel)}
.reg__grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,6vw,84px);align-items:center}
.reg__copy .h-lead{margin-bottom:18px}
.reg__bullets{list-style:none;padding:0;margin:28px 0 0}
.reg__bullets li{display:flex;gap:12px;align-items:flex-start;padding:9px 0;font-size:14.5px;color:var(--silver)}
.reg__bullets li::before{content:"";width:8px;height:8px;margin-top:7px;border:1px solid var(--ember);transform:rotate(45deg);flex:none}
.reg__phone{margin-top:30px;font-family:var(--mono);font-size:clamp(20px,3vw,30px);color:var(--white)}
.reg__phone span{display:block;font-size:11px;letter-spacing:.18em;color:var(--silver-dim);margin-bottom:6px}
.form{border:1px solid var(--line);background:rgba(7,8,9,.5);padding:clamp(26px,3vw,40px)}
.form .fld{margin-bottom:18px}
.form label{display:block;font-size:12px;letter-spacing:.06em;color:var(--silver-dim);margin-bottom:8px}
.form input,.form select{width:100%;background:var(--ink);border:1px solid var(--line);color:var(--white);
  padding:13px 14px;font-family:var(--sans);font-size:14px;transition:border .25s}
.form input:focus,.form select:focus{border-color:var(--ember);outline:none}
.form .agree{display:flex;gap:10px;align-items:flex-start;font-size:12.5px;color:var(--silver-dim);margin:6px 0 20px}
.form .agree input{width:auto;margin-top:3px}
.form .btn--ember{width:100%;justify-content:center;border:0}
.form__done{display:none;text-align:center;padding:24px 8px}
.form__done.show{display:block;animation:pop .5s ease}
.form__done .chk{width:56px;height:56px;border:1px solid var(--ember);border-radius:50%;display:grid;place-items:center;margin:0 auto 18px;color:var(--ember)}
.form__done h4{font-family:var(--serif);font-weight:300;font-size:26px;color:var(--white);margin:0 0 8px}
.form__done p{font-size:14px;color:var(--silver-dim);margin:0}
@keyframes pop{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:none}}
@media (max-width:820px){.reg__grid{grid-template-columns:1fr}}

/* sticky mobile CTA */
.scta{position:fixed;left:0;right:0;bottom:0;z-index:70;display:none;
  background:rgba(7,8,9,.96);border-top:1px solid var(--line);
  padding:11px 16px calc(11px + env(safe-area-inset-bottom));gap:10px;align-items:center}
.scta b{font-family:var(--mono);font-size:13px;color:var(--white);flex:1}
.scta b small{display:block;font-size:10px;color:var(--silver-dim);letter-spacing:.06em}
.scta a{flex:none;background:var(--ember);color:#120a04;font-weight:600;font-size:13px;padding:12px 18px}
@media (max-width:760px){.scta{display:flex}body{padding-bottom:64px}}

/* =================================================================
   FOOTER
   ================================================================= */
.foot{background:var(--ink);border-top:1px solid var(--line);padding:60px 0 90px}
.foot__top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;align-items:flex-start}
.foot__brand{font-family:var(--mono);font-size:16px;letter-spacing:.16em;color:var(--white)}
.foot__brand b{color:var(--ember);font-weight:400}
.foot__meta{font-size:13px;color:var(--silver-dim);max-width:420px}
.foot__meta b{color:var(--silver);font-weight:600}
.foot__disc{margin-top:40px;padding-top:24px;border-top:1px solid var(--line-soft);font-size:11.5px;color:var(--silver-faint);line-height:1.8;font-family:var(--mono);letter-spacing:.01em}

/* PLOT-KO-WRAP: 한글 어절 단위 줄바꿈 + 오버플로 방지 (어떤 폭에서도 자연스럽게) */
:where(html){word-break:keep-all;overflow-wrap:break-word}

/* 예시 평면/배치도(원본 도면 부재 시 대체) · 테마무관 */
.ex-plan{--plan-accent:currentColor;margin:30px auto 4px}
.ex-plan>svg{display:block;width:100%;max-width:720px;margin:0 auto;background:color-mix(in srgb,currentColor 5%,transparent);border:1px solid color-mix(in srgb,currentColor 20%,transparent);border-radius:16px;padding:14px}
.ex-plan--wide>svg{max-width:880px}
.ex-plan--sec{padding:clamp(48px,8vw,90px) clamp(18px,5vw,40px)}
.ex-plan__h{max-width:880px;margin:0 auto 20px;text-align:center;font-size:clamp(1.3rem,2.6vw,1.9rem);font-weight:700;letter-spacing:-.01em}
.ex-plan__why{max-width:760px;margin:16px auto 0;text-align:center;font-size:.94rem;opacity:.85;line-height:1.65}
.ex-plan__cap{max-width:880px;margin:8px auto 0;text-align:center;font-size:.8rem;opacity:.6}
.ex-plan__cap b,.ex-plan__why b{font-weight:700}