/* ===== Design tokens ===== */
:root{
  --ink:#14181d;
  --ink-soft:#3a4048;
  --paper:#ffffff;
  --mist:#f4f5f6;
  --line:#e4e6e9;
  --accent:#2c6e9e;
  --accent-dark:#17364a;
  --text-2:#5b6470;
  --container:1320px;
  --pad:clamp(20px, 4vw, 64px);
  --radius:4px;
  --ff:"Pretendard", -apple-system, BlinkMacSystemFont, "Noto Sans KR", sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden;width:100%}
body{
  margin:0;
  font-family:var(--ff);
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  width:100%;
  position:relative;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,p,dl,dd{margin:0}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:999}
.skip-link:focus{left:8px;top:8px}

.eyebrow{
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent);
  margin:0 0 14px;
}
h1{font-size:clamp(2.1rem, 4.6vw, 3.4rem); font-weight:800; line-height:1.15; letter-spacing:-.01em;}
h2{font-size:clamp(1.5rem, 2.6vw, 2.1rem); font-weight:800; line-height:1.25; letter-spacing:-.01em;}
h3{font-size:1.2rem; font-weight:700; line-height:1.4;}
p{color:var(--text-2); line-height:1.75; font-size:1rem;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:14px 28px;border-radius:var(--radius);
  font-weight:700;font-size:.95rem;letter-spacing:.02em;
  border:1px solid transparent;transition:opacity .2s, background .2s;
}
.btn--accent{background:var(--accent);color:#fff}
.btn--accent:hover{background:var(--accent-dark)}
.btn--line{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn--line:hover{background:var(--ink);color:#fff}
.btn--lg{padding:16px 36px;font-size:1rem}

.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-weight:700;font-size:.92rem;color:var(--accent);
  border-bottom:1px solid transparent;
}
.link-arrow::after{content:"→";transition:transform .2s}
.link-arrow:hover::after{transform:translateX(4px)}

/* ===== Header ===== */
.oyk-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.oyk-header__inner{
  max-width:var(--container);margin:0 auto;padding:0 var(--pad);
  height:76px;display:flex;align-items:center;justify-content:space-between;
}
.oyk-logo{font-size:1.2rem;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.oyk-logo em{font-style:normal;color:var(--accent)}
.oyk-nav{display:flex;align-items:center;gap:32px}
.oyk-nav__list{display:flex;align-items:center;gap:28px}
.oyk-nav__list a{font-size:.94rem;font-weight:600;color:var(--ink-soft)}
.oyk-nav__list a:hover{color:var(--accent)}
.oyk-nav__tel{font-weight:800;color:var(--accent);font-size:.95rem}
.oyk-nav-toggle{display:none;flex-direction:column;gap:5px;width:32px;background:none;border:0;cursor:pointer;padding:6px}
.oyk-nav-toggle span{display:block;width:100%;height:2px;background:var(--ink)}

@media (max-width:1024px){
  .oyk-nav-toggle{display:flex}
  .oyk-nav{
    position:fixed;inset:76px 0 0 auto;width:min(320px,80vw);height:calc(100vh - 76px);
    background:var(--paper);flex-direction:column;align-items:flex-start;
    padding:32px 28px;gap:24px;transform:translateX(100%);transition:transform .25s ease;
    box-shadow:-8px 0 24px rgba(0,0,0,.08);
  }
  .oyk-nav.is-open{transform:translateX(0)}
  .oyk-nav__list{flex-direction:column;align-items:flex-start;gap:20px}
  .oyk-nav__list a{font-size:1.05rem}
}

/* ===== Layout helpers ===== */
.section{max-width:var(--container);margin:0 auto;padding:88px var(--pad)}
.section__head{max-width:640px;margin-bottom:48px}
.section__lead{margin-top:10px}
.section__more{margin-top:40px;text-align:center}
.section__note{margin-top:24px;color:var(--text-2);font-size:.9rem;text-align:center}
.page-intro{max-width:var(--container);margin:0 auto;padding:72px var(--pad) 40px}
.page-intro__lead{max-width:720px;margin-top:16px;font-size:1.05rem}

/* ===== Hero ===== */
.hero{position:relative;min-height:86vh;display:flex;align-items:flex-end;color:#fff;background:var(--ink)}
.hero__media{position:absolute;inset:0}
.hero__media img{width:100%;height:100%;object-fit:cover;opacity:.88}
.hero__media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(20,24,29,.05) 0%, rgba(20,24,29,.75) 100%)}
.hero__panel{position:relative;z-index:1;max-width:var(--container);width:100%;margin:0 auto;padding:0 var(--pad) 72px}
.hero__panel .eyebrow{color:#cfe0ec}
.hero h1{color:#fff}
.hero__desc{color:#e7ecef;max-width:560px;margin-top:18px;font-size:1.08rem}
.hero__actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}

/* ===== Service rows (Products-style) ===== */
.service-rows{display:flex;flex-direction:column;gap:96px}
.service-row{display:grid;grid-template-columns:1.2fr 1fr;gap:56px;align-items:center}
.service-row--rev{grid-template-columns:1fr 1.2fr}
.service-row--rev .service-row__media{order:2}
.service-row--rev .service-row__text{order:1}
.service-row__media img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius)}
.service-row__text h3,.service-row__text h2{margin-bottom:14px}
.service-row__text p{margin-bottom:18px}

@media (max-width:900px){
  .service-row,.service-row--rev{grid-template-columns:1fr;gap:24px}
  .service-row--rev .service-row__media,.service-row--rev .service-row__text{order:initial}
  .service-rows{gap:56px}
}

/* ===== Accordion ===== */
.accordion{border-top:1px solid var(--line)}
.accordion details{border-bottom:1px solid var(--line)}
.accordion summary{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:22px 4px;cursor:pointer;font-weight:700;font-size:1.05rem;list-style:none;
}
.accordion summary::-webkit-details-marker{display:none}
.accordion summary span{font-weight:500;font-size:.9rem;color:var(--text-2);text-align:right}
.accordion summary::after{content:"+";font-size:1.3rem;color:var(--accent);margin-left:12px}
.accordion details[open] summary::after{content:"–"}
.accordion__body{padding:0 4px 24px;max-width:760px}

/* ===== Spaces list ===== */
.space-list{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.space-list li{background:var(--paper);padding:40px 24px;font-weight:700;font-size:1.02rem;display:flex;flex-direction:column;gap:14px}
.space-list__icon{font-size:1.4rem;color:var(--accent)}
@media (max-width:900px){.space-list{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.space-list{grid-template-columns:1fr}}

/* ===== Case cards ===== */
.case-card{display:grid;grid-template-columns:1.3fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--paper)}
.case-card__media img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10}
.case-card__text{padding:40px;display:flex;flex-direction:column;justify-content:center;gap:10px}
.case-card__tag{color:var(--accent);font-weight:700;font-size:.85rem;letter-spacing:.04em;text-transform:uppercase}
.case-card__text h2,.case-card__text h3{margin:0}
.case-grid{display:grid;gap:32px}
@media (max-width:800px){
  .case-card{grid-template-columns:1fr}
  .case-card__media img{aspect-ratio:16/9}
}

/* ===== Process table ===== */
.process-table{width:100%;border-collapse:collapse;border-top:2px solid var(--ink)}
.process-table th{text-align:left;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text-2);font-weight:700;padding:14px 16px;border-bottom:1px solid var(--line)}
.process-table td{padding:20px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.process-table td:first-child{font-weight:800;color:var(--accent);width:64px;font-size:1.1rem}
.process-table td:nth-child(2){font-weight:700;width:160px;white-space:nowrap}
@media (max-width:700px){
  .process-table thead{display:none}
  .process-table, .process-table tbody, .process-table tr, .process-table td{display:block;width:auto}
  .process-table tr{border-bottom:1px solid var(--line);padding:16px 0}
  .process-table td{border:0;padding:4px 0}
  .process-table td:first-child{color:var(--accent);font-weight:800}
  .process-table td[data-label]::before{content:attr(data-label);display:block;font-size:.75rem;color:var(--text-2);margin-bottom:2px;font-weight:600}
  .process-table td:first-child::before{content:"STEP"}
}

/* ===== Photo grid ===== */
.photo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.photo-grid__item{aspect-ratio:4/5;overflow:hidden;border-radius:var(--radius);background:var(--mist)}
.photo-grid__item img{width:100%;height:100%;object-fit:cover}
@media (max-width:900px){.photo-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:600px){.photo-grid{grid-template-columns:repeat(2,1fr);gap:8px}}

/* ===== Why us ===== */
.section--why{background:var(--mist)}
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.why-card{background:var(--paper);padding:36px 30px}
.why-card h3{margin-bottom:12px}
@media (max-width:900px){.why-grid{grid-template-columns:1fr}}

/* ===== FAQ ===== */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{padding:20px 4px;cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--accent);font-size:1.2rem}
.faq-item[open] summary::after{content:"–"}
.faq-item__body{padding:0 4px 20px;max-width:760px}

/* ===== CTA band ===== */
.cta-band{background:var(--ink);color:#fff;text-align:center;padding:96px var(--pad)}
.cta-band h2{color:#fff;margin-bottom:12px}
.cta-band p{color:#c9d2d8;margin-bottom:32px}

/* ===== Facts / contact ===== */
.fact-list{display:grid;grid-template-columns:repeat(2,1fr);gap:20px 40px;max-width:760px}
.fact-list div{border-top:1px solid var(--line);padding-top:12px}
.fact-list dt{font-size:.82rem;color:var(--text-2);margin-bottom:6px}
.fact-list dd{font-weight:700;font-size:1.05rem}
@media (max-width:600px){.fact-list{grid-template-columns:1fr}}

.contact-actions{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:56px}
.contact-card{border:1px solid var(--line);border-radius:var(--radius);padding:32px;display:flex;flex-direction:column;gap:8px}
.contact-card__label{color:var(--text-2);font-size:.9rem;font-weight:600}
.contact-card__value{font-size:1.4rem;font-weight:800}
.contact-card:hover{border-color:var(--accent)}
@media (max-width:640px){.contact-actions{grid-template-columns:1fr}}

.check-list{display:grid;gap:14px;max-width:640px}
.check-list li{padding:16px 20px;background:var(--mist);border-radius:var(--radius);font-weight:600}

.breadcrumb{max-width:var(--container);margin:0 auto;padding:24px var(--pad) 0;font-size:.85rem;color:var(--text-2)}
.breadcrumb a{color:var(--text-2)}
.breadcrumb a:hover{color:var(--accent)}

.case-hero{max-width:var(--container);margin:24px auto 0;padding:0 var(--pad)}
.case-hero img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius)}

/* ===== Footer ===== */
.oyk-footer{background:var(--ink);color:#c9d2d8;padding:72px var(--pad) 32px}
.oyk-footer__inner{max-width:var(--container);margin:0 auto;display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px}
.oyk-footer__logo{font-size:1.15rem;font-weight:800;color:#fff}
.oyk-footer__logo em{font-style:normal;color:var(--accent)}
.oyk-footer__tagline{margin-top:10px;font-size:.9rem}
.oyk-footer__list{display:flex;flex-direction:column;gap:10px}
.oyk-footer__list a{font-size:.92rem}
.oyk-footer__list a:hover{color:#fff}
.oyk-footer__nap p{margin:0 0 8px;font-size:.88rem}
.oyk-footer__nap a{font-weight:700;color:#fff}
.oyk-footer__bottom{max-width:var(--container);margin:40px auto 0;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);font-size:.8rem;color:#8b95a1}
@media (max-width:800px){.oyk-footer__inner{grid-template-columns:1fr;gap:28px}}

.oyk-fab{
  position:fixed;right:20px;bottom:20px;z-index:90;
  display:flex;align-items:center;gap:8px;background:var(--accent);color:#fff;
  padding:14px 18px;border-radius:999px;font-weight:800;font-size:.9rem;
  box-shadow:0 8px 24px rgba(0,0,0,.2);
}
@media (min-width:900px){.oyk-fab{display:none}}

/* ===== Mobile hero/section tightening ===== */
@media (max-width:768px){
  .hero{min-height:78vh}
  .section{padding:56px var(--pad)}
  .cta-band{padding:64px var(--pad)}
  .page-intro{padding:48px var(--pad) 24px}
}
@media (max-width:400px){
  .hero__panel{padding-bottom:48px}
  .hero__actions .btn{width:100%}
}