/* =========================================================
   HAOS × Sto — 건축 마감재 데모 · 공통 디자인 시스템
   made by 탱탱소프트
   ========================================================= */

/* ---------- Tokens ---------- */
:root{
  --paper:#ffffff;
  --mist:#f5f3f0;        /* 석고 오프화이트 */
  --mist-2:#ece9e3;
  --ink:#171615;
  --graphite:#4a4744;
  --muted:#8b867f;
  --line:#e5e2dd;
  --line-soft:#efece7;
  --accent:#ef6c1a;      /* Sto 오렌지 (절제 사용) */
  --accent-deep:#d4540a;
  --shadow:0 24px 60px -24px rgba(23,22,21,.28);
  --shadow-soft:0 12px 40px -20px rgba(23,22,21,.22);

  --maxw:1320px;
  --gut:clamp(20px,5vw,72px);
  --nav-h:74px;

  --f-display:"Archivo","Pretendard",system-ui,sans-serif;
  --f-body:"Pretendard",system-ui,-apple-system,"Segoe UI",sans-serif;

  --e:cubic-bezier(.16,.84,.32,1);
  --e-out:cubic-bezier(.22,1,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--f-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.7;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
ul{list-style:none}
input,textarea,select{font-family:inherit;font-size:1rem;color:inherit}
::selection{background:var(--accent);color:#fff}

/* ---------- Typo helpers ---------- */
.display{font-family:var(--f-display);font-weight:700;letter-spacing:-.01em;line-height:1.02}
.eyebrow{
  font-family:var(--f-display);font-size:.72rem;font-weight:600;
  letter-spacing:.28em;text-transform:uppercase;color:var(--accent);
  display:inline-flex;align-items:center;gap:.7em;
}
.eyebrow::before{content:"";width:30px;height:1px;background:var(--accent);display:inline-block}
.eyebrow.center::after{content:"";width:30px;height:1px;background:var(--accent);display:inline-block}
.lead{font-size:clamp(1.05rem,1.6vw,1.32rem);color:var(--graphite);line-height:1.65}
.muted{color:var(--muted)}
.mono{font-variant-numeric:tabular-nums;font-family:var(--f-display)}

/* ---------- Layout ---------- */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.section{padding-block:clamp(72px,10vw,140px)}
.section--mist{background:var(--mist)}
.section--ink{background:var(--ink);color:#fff}
.section-head{max-width:760px;margin-bottom:clamp(36px,5vw,64px)}
.section-head h2{font-size:clamp(1.9rem,4.2vw,3.3rem);margin:.4em 0 .35em}
.section-head.center{margin-inline:auto;text-align:center}
.grid{display:grid;gap:clamp(18px,2.4vw,34px)}
.snum{font-family:var(--f-display);font-size:.72rem;letter-spacing:.2em;color:var(--muted)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.7em;
  padding:.95em 1.7em;font-size:.86rem;font-weight:600;letter-spacing:.04em;
  border-radius:2px;transition:.4s var(--e);position:relative;
  font-family:var(--f-display);
}
.btn .ar{transition:transform .4s var(--e)}
.btn:hover .ar{transform:translateX(5px)}
.btn--solid{background:var(--ink);color:#fff}
.btn--solid:hover{background:var(--accent)}
.btn--accent{background:var(--accent);color:#fff}
.btn--accent:hover{background:var(--accent-deep)}
.btn--ghost{border:1px solid var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink);background:var(--ink);color:#fff}
.btn--light{border:1px solid rgba(255,255,255,.4);color:#fff}
.btn--light:hover{background:#fff;color:var(--ink);border-color:#fff}

/* ---------- Top progress bar ---------- */
#progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--accent);z-index:1200;transition:width .1s linear}

/* ---------- Nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1000;
  display:flex;align-items:center;
  transition:background .4s var(--e),box-shadow .4s var(--e),height .4s var(--e);
}
.nav__inner{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut);width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:24px}
.nav__brand{display:flex;align-items:baseline;gap:.5em;font-family:var(--f-display);font-weight:700;
  font-size:1.34rem;letter-spacing:.02em;color:#fff;transition:color .4s var(--e)}
.nav__brand b{color:var(--accent)}
.nav__brand small{font-size:.62rem;letter-spacing:.22em;font-weight:600;color:rgba(255,255,255,.65);
  text-transform:uppercase;transition:color .4s var(--e)}
.nav__menu{display:flex;align-items:center;gap:clamp(14px,2vw,34px);height:100%}
.nav__item{height:100%;display:flex;align-items:center}
.nav__link{
  font-family:var(--f-display);font-size:.82rem;font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;color:rgba(255,255,255,.92);padding:0 2px;position:relative;
  transition:color .35s var(--e);
}
.nav__link::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--accent);transition:width .35s var(--e)}
.nav__item:hover .nav__link::after,.nav__link.is-active::after{width:100%}
.nav__right{display:flex;align-items:center;gap:18px}
.nav__lang{font-family:var(--f-display);font-size:.74rem;letter-spacing:.12em;color:rgba(255,255,255,.7)}
.nav__lang b{color:#fff}
.nav__cta{font-family:var(--f-display);font-size:.78rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  border:1px solid rgba(255,255,255,.4);padding:.6em 1.2em;border-radius:2px;color:#fff;transition:.35s var(--e)}
.nav__cta:hover{background:#fff;color:var(--ink)}

/* solid state (scrolled / inner pages) */
.nav.is-solid{background:rgba(255,255,255,.92);backdrop-filter:saturate(140%) blur(14px);
  box-shadow:0 1px 0 var(--line);height:64px}
.nav.is-solid .nav__brand,.nav.is-solid .nav__link{color:var(--ink)}
.nav.is-solid .nav__brand small{color:var(--muted)}
.nav.is-solid .nav__lang{color:var(--muted)}.nav.is-solid .nav__lang b{color:var(--ink)}
.nav.is-solid .nav__cta{border-color:var(--line);color:var(--ink)}
.nav.is-solid .nav__cta:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
body.theme-light .nav:not(.is-solid) .nav__brand,
body.theme-light .nav:not(.is-solid) .nav__link{color:var(--ink)}
body.theme-light .nav:not(.is-solid) .nav__brand small,
body.theme-light .nav:not(.is-solid) .nav__lang{color:var(--muted)}
body.theme-light .nav:not(.is-solid) .nav__cta{border-color:var(--line);color:var(--ink)}

/* Mega menu */
.mega{
  position:fixed;top:var(--nav-h);left:0;right:0;background:#fff;
  border-top:1px solid var(--line);box-shadow:var(--shadow-soft);
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:.4s var(--e);z-index:999;
}
.nav.is-solid ~ .mega{top:64px}
.mega.is-open{opacity:1;visibility:visible;transform:none}
.mega__inner{max-width:var(--maxw);margin-inline:auto;padding:clamp(28px,4vw,52px) var(--gut);
  display:grid;grid-template-columns:1.1fr 2fr;gap:clamp(28px,5vw,72px)}
.mega__lead h3{font-family:var(--f-display);font-size:1.7rem;margin-bottom:.4em}
.mega__lead p{color:var(--muted);font-size:.92rem;max-width:32ch}
.mega__cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:28px}
.mega__col h4{font-family:var(--f-display);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.mega__col a{display:block;padding:7px 0;font-size:.95rem;color:var(--graphite);transition:.25s var(--e);position:relative}
.mega__col a:hover{color:var(--ink);transform:translateX(5px)}

/* mobile nav */
.nav__burger{display:none;width:30px;height:20px;position:relative}
.nav__burger span{position:absolute;left:0;width:100%;height:2px;background:#fff;transition:.35s var(--e)}
.nav.is-solid .nav__burger span,body.theme-light .nav:not(.is-solid) .nav__burger span{background:var(--ink)}
.nav__burger span:nth-child(1){top:2px}.nav__burger span:nth-child(2){top:9px}.nav__burger span:nth-child(3){top:16px}
body.menu-open .nav__burger span:nth-child(1){top:9px;transform:rotate(45deg)}
body.menu-open .nav__burger span:nth-child(2){opacity:0}
body.menu-open .nav__burger span:nth-child(3){top:9px;transform:rotate(-45deg)}

.mobile-menu{position:fixed;inset:0;background:var(--ink);z-index:998;padding:calc(var(--nav-h) + 30px) var(--gut) 40px;
  display:flex;flex-direction:column;gap:6px;transform:translateY(-100%);transition:transform .5s var(--e);overflow-y:auto}
body.menu-open .mobile-menu{transform:none}
.mobile-menu a{font-family:var(--f-display);font-size:1.5rem;font-weight:600;color:#fff;padding:14px 0;
  border-bottom:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;align-items:center}
.mobile-menu a small{font-size:.7rem;color:var(--muted);letter-spacing:.1em}

/* ---------- Page hero (inner) ---------- */
.phero{position:relative;min-height:56vh;display:flex;align-items:flex-end;color:#fff;overflow:hidden;padding-bottom:clamp(40px,6vw,80px)}
.phero__bg{position:absolute;inset:0;z-index:-2}
.phero__bg img{width:100%;height:100%;object-fit:cover}
.phero::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(20,19,18,.35),rgba(20,19,18,.72))}
.phero h1{font-family:var(--f-display);font-size:clamp(2.3rem,6vw,4.6rem);font-weight:700;line-height:1.02}
.phero p{max-width:54ch;margin-top:.7em;color:rgba(255,255,255,.85)}
.crumb{font-family:var(--f-display);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.7);margin-bottom:1.4em}
.crumb a:hover{color:#fff}.crumb span{color:var(--accent)}

/* ---------- Reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(36px);transition:opacity .9s var(--e-out),transform .9s var(--e-out)}
[data-reveal].in{opacity:1;transform:none}
[data-reveal][data-d="1"]{transition-delay:.1s}[data-reveal][data-d="2"]{transition-delay:.2s}
[data-reveal][data-d="3"]{transition-delay:.3s}[data-reveal][data-d="4"]{transition-delay:.4s}
[data-reveal][data-d="5"]{transition-delay:.5s}

/* ---------- Cards / media ---------- */
.media{overflow:hidden;background:var(--mist-2)}
.media img{width:100%;height:100%;object-fit:cover;transition:transform 1.1s var(--e-out)}
.media:hover img{transform:scale(1.06)}
.ar-4-3{aspect-ratio:4/3}.ar-3-2{aspect-ratio:3/2}.ar-1-1{aspect-ratio:1/1}.ar-3-4{aspect-ratio:3/4}.ar-16-9{aspect-ratio:16/9}

/* ---------- Footer ---------- */
.footer{background:var(--ink);color:rgba(255,255,255,.7);padding-block:clamp(56px,7vw,88px) 32px}
.footer__top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;
  padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer__brand{font-family:var(--f-display);font-weight:700;font-size:1.6rem;color:#fff;margin-bottom:.5em}
.footer__brand b{color:var(--accent)}
.footer p{font-size:.9rem;line-height:1.8}
.footer h5{font-family:var(--f-display);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:#fff;margin-bottom:16px}
.footer__links a{display:block;padding:5px 0;font-size:.9rem;transition:.25s var(--e)}
.footer__links a:hover{color:#fff;transform:translateX(4px)}
.footer__bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;padding-top:26px;font-size:.78rem;color:var(--muted)}
.footer__bottom a:hover{color:#fff}
.footer__seo{margin-top:14px;font-size:.72rem;color:rgba(255,255,255,.3);line-height:1.7;max-width:90ch}

/* ---------- Modal (popup) ---------- */
.modal{position:fixed;inset:0;z-index:1500;display:flex;align-items:center;justify-content:center;
  padding:clamp(16px,4vw,48px);opacity:0;visibility:hidden;transition:.4s var(--e)}
.modal.is-open{opacity:1;visibility:visible}
.modal__veil{position:absolute;inset:0;background:rgba(15,14,13,.78);backdrop-filter:blur(4px)}
.modal__box{position:relative;background:#fff;max-width:1080px;width:100%;max-height:90vh;overflow:auto;
  transform:translateY(24px) scale(.98);transition:.5s var(--e);box-shadow:var(--shadow)}
.modal.is-open .modal__box{transform:none}
.modal__close{position:absolute;top:16px;right:16px;width:44px;height:44px;border-radius:50%;
  background:rgba(255,255,255,.9);display:flex;align-items:center;justify-content:center;z-index:3;
  font-size:1.1rem;box-shadow:var(--shadow-soft);transition:.3s var(--e)}
.modal__close:hover{background:var(--ink);color:#fff;transform:rotate(90deg)}

/* ---------- Accordion ---------- */
.acc__item{border-bottom:1px solid var(--line)}
.acc__head{width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:24px 4px;text-align:left;transition:.3s var(--e)}
.acc__head:hover{color:var(--accent)}
.acc__head h3{font-family:var(--f-display);font-size:clamp(1.05rem,2vw,1.32rem);font-weight:600}
.acc__head .ic{width:34px;height:34px;border:1px solid var(--line);border-radius:50%;
  display:grid;place-items:center;flex:none;transition:.4s var(--e);font-size:1.1rem}
.acc__item.is-open .acc__head .ic{background:var(--accent);color:#fff;border-color:var(--accent);transform:rotate(45deg)}
.acc__body{max-height:0;overflow:hidden;transition:max-height .5s var(--e)}
.acc__body-inner{padding:0 4px 28px}

/* ---------- Tags / chips ---------- */
.tag{display:inline-block;font-family:var(--f-display);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;
  padding:.42em .9em;border:1px solid var(--line);border-radius:99px;color:var(--graphite)}
.tag--accent{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ---------- Marquee ---------- */
.marquee{overflow:hidden;white-space:nowrap;border-block:1px solid var(--line);padding-block:18px}
.marquee__track{display:inline-flex;gap:48px;animation:marq 32s linear infinite}
.marquee span{font-family:var(--f-display);font-size:clamp(1rem,2vw,1.4rem);font-weight:600;letter-spacing:.04em;color:var(--graphite)}
.marquee span b{color:var(--accent)}
@keyframes marq{to{transform:translateX(-50%)}}

/* ---------- Utility ---------- */
.center{text-align:center}
.hairline{height:1px;background:var(--line);border:0}
.count{font-family:var(--f-display);font-weight:700;line-height:1;font-variant-numeric:tabular-nums}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .footer__top{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav__menu,.nav__lang{display:none}
  .nav__burger{display:block}
  .nav__right .nav__cta{display:none}
  .mega{display:none}
}
@media (max-width:680px){
  :root{--nav-h:64px}
  .footer__top{grid-template-columns:1fr}
  .section-head{margin-bottom:32px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  [data-reveal]{opacity:1;transform:none}
}