/* ===== 변수 ===== */
:root{
  --bg:#F8FAFC;
  --bg-sub:#E2E8F0;
  --accent:#2563EB;
  --text:#0F172A;
  --header-h:64px;
  --side-pad:24px;
  --section-gap:50px;
  --radius:12px;
}
@media (min-width:768px){
  :root{ --header-h:76px; --side-pad:40px; --section-gap:80px; }
}

/* ===== 리셋 / 베이스 ===== */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:Pretendard,-apple-system,BlinkMacSystemFont,"Malgun Gothic",sans-serif;
  font-size:16px;
  line-height:1.6;
  color:var(--text);
  background:var(--bg);
}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.35;}
h1{font-size:29px;}
h2{font-size:22px;}
h3{font-size:18px;}
h4{font-size:16px;}
p{margin:0;}
@media (min-width:768px){
  h1{font-size:44px;}
  h2{font-size:32px;}
  h3{font-size:22px;}
}
.container{max-width:1200px;margin:0 auto;padding:0 var(--side-pad);}
.icon{width:24px;height:24px;fill:currentColor;flex:none;}
.icon-sprite{position:absolute;width:0;height:0;overflow:hidden;}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:10px 16px;z-index:200;}
.skip-link:focus{left:8px;top:8px;}

/* ===== 버튼 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 20px;border-radius:var(--radius);
  font-size:16px;font-weight:700;border:none;cursor:pointer;white-space:nowrap;
}
.btn-primary{background:var(--accent);color:#fff;}
.btn-outline{background:transparent;color:var(--accent);border:2px solid var(--accent);}
.btn-sm{min-height:40px;padding:8px 20px;font-size:15px;}

/* ===== 섹션 공통 ===== */
section{padding:var(--section-gap) 0;}
.section-label{
  display:inline-block;font-size:14px;font-weight:700;color:var(--accent);
  letter-spacing:.04em;margin-bottom:12px;text-transform:uppercase;
}
.section-head{margin-bottom:32px;}
.section-head h2{margin-bottom:12px;}
.section-head p{color:#475569;font-size:16px;}
.fade-in{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease;}
.fade-in.is-visible{opacity:1;transform:none;}

/* ===== 헤더 ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:transparent;
  box-shadow:0 1px 0 0 transparent;
}
.site-header.transitions-enabled{transition:background-color .3s ease, box-shadow .3s ease;}
.site-header.is-scrolled{background:var(--bg);box-shadow:0 1px 0 0 var(--bg-sub);}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:var(--header-h);padding:0 var(--side-pad);
}
.logo{display:flex;align-items:center;gap:8px;flex:none;}
.logo-text{font-size:18px;font-weight:700;}
.main-nav{display:flex;align-items:center;gap:28px;}
.main-nav a{display:flex;align-items:center;gap:6px;font-weight:600;font-size:15px;}
.hamburger-btn{
  width:44px;height:44px;flex:none;border:none;background:none;cursor:pointer;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
}
.hamburger-btn span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:transform .3s ease, opacity .3s ease;}
.hamburger-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger-btn[aria-expanded="true"] span:nth-child(2){opacity:0;}
.hamburger-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.mobile-menu{
  max-height:0;overflow:hidden;background:var(--bg);
  transition:max-height .35s ease;
}
.mobile-menu.is-open{max-height:320px;box-shadow:inset 0 1px 0 0 var(--bg-sub);}
.mobile-menu a{display:flex;align-items:center;gap:12px;padding:14px var(--side-pad);min-height:44px;font-weight:600;}

/* ===== 히어로 ===== */
.hero{position:relative;min-height:100vh;min-height:100dvh;display:flex;align-items:flex-end;overflow:hidden;color:#fff;}
.hero-blinds{position:absolute;inset:0;z-index:0;background:var(--text);}
.hero-blinds .blind-back,.hero-blinds .blind-strip{position:absolute;inset:0;background-size:cover;background-position:center;transition:clip-path .65s cubic-bezier(.24,.43,.15,.97);}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(0deg,rgba(15,23,42,.75) 0%,rgba(15,23,42,.25) 55%,rgba(15,23,42,.15) 100%);z-index:1;}
.hero-content{position:relative;z-index:2;padding:0 var(--side-pad) 64px;max-width:720px;}
.hero-content h1{color:#fff;margin-bottom:16px;}
.hero-content .hero-copy{font-size:16px;color:#E2E8F0;margin-bottom:28px;}
.hero-content .cta-buttons{display:flex;flex-wrap:wrap;gap:12px;}

/* ===== 시공사례 ===== */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
.case-card{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;}
.case-card img{width:100%;height:100%;object-fit:cover;}
.case-card .case-title{
  display:none;
}
@media (min-width:768px){
  .case-grid{grid-template-columns:repeat(3,1fr);gap:20px;}
  .case-card .case-title{
    display:block;position:absolute;left:0;right:0;bottom:0;padding:16px;
    background:linear-gradient(0deg,rgba(15,23,42,.75),transparent);
    color:#fff;font-size:15px;font-weight:700;
    opacity:0;transform:translateY(12px);transition:opacity .3s ease, transform .3s ease;
  }
  .case-card:hover .case-title{opacity:1;transform:translateY(0);}
}

/* ===== CONCERNS ===== */
.concerns-grid{display:grid;grid-template-columns:1fr;gap:20px;}
.concern-card{background:#fff;border-radius:var(--radius);padding:24px;}
.concern-card .concern-icon{
  width:44px;height:44px;border-radius:12px;background:var(--bg-sub);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--accent);
}
.concern-card h3{margin-bottom:10px;}
.concern-card p{color:#475569;}
@media (min-width:768px){ .concerns-grid{grid-template-columns:repeat(3,1fr);gap:24px;} }

/* ===== 프로세스(풀스크린 이미지) ===== */
.process-hero{position:relative;width:100%;}
.process-hero img{width:100%;height:auto;}
.process-scrim{position:absolute;inset:0;background:linear-gradient(0deg,rgba(15,23,42,.85) 0%,rgba(15,23,42,.35) 45%,transparent 70%);}
.process-steps{
  position:absolute;left:0;right:0;bottom:0;padding:24px var(--side-pad) 32px;
  display:grid;grid-template-columns:repeat(2,1fr);gap:16px;
}
.process-step{color:#fff;}
.process-step .step-num{
  width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;margin-bottom:8px;
}
.process-step h3{color:#fff;font-size:16px;margin-bottom:4px;}
.process-step p{color:#E2E8F0;font-size:14px;}
@media (min-width:768px){
  /* PC: 오버레이 바 없이 사진만, 섹션 높이는 낮게, 스텝은 개별 프로스트 글래스 카드로 크게 */
  .process-hero img{height:min(46vw, 520px);object-fit:cover;}
  .process-scrim{display:none;}
  .process-steps{
    inset:0;
    grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(2,1fr);gap:1px;
    padding:0;
  }
  .process-step{
    background:rgba(15,23,42,.34);
    backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
    border-radius:0;padding:28px;
    display:flex;flex-direction:column;justify-content:center;
  }
  .process-step .step-num{width:40px;height:40px;font-size:16px;margin-bottom:12px;}
  .process-step h3{font-size:21px;margin-bottom:8px;}
  .process-step p{font-size:14px;}
}

/* ===== 회사소개 ===== */
.about-grid{display:flex;overflow-x:auto;gap:16px;scroll-snap-type:x mandatory;scrollbar-width:none;padding-bottom:4px;}
.about-grid::-webkit-scrollbar{display:none;}
.about-card{flex:0 0 100%;scroll-snap-align:start;background:#fff;border-radius:var(--radius);padding:24px;}
.about-card .about-icon{
  width:44px;height:44px;border-radius:12px;background:var(--bg-sub);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.about-card h3{margin-bottom:10px;}
.about-card p{color:#475569;}
.about-dots{display:flex;justify-content:center;gap:8px;margin-top:16px;}
.about-dots span{width:8px;height:8px;border-radius:50%;background:var(--bg-sub);}
.about-dots span.is-active{background:var(--accent);}
@media (min-width:768px){
  .about-grid{overflow:visible;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .about-card{scroll-snap-align:none;}
  .about-dots{display:none;}
}

/* ===== 서비스 ===== */
.service-grid{display:grid;grid-template-columns:1fr;gap:20px;}
.service-card{background:#fff;border-radius:var(--radius);overflow:hidden;transition:transform .3s ease, box-shadow .3s ease;}
.service-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(15,23,42,.12);}
.service-thumb{position:relative;aspect-ratio:4/3;overflow:hidden;}
.service-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.service-card:hover .service-thumb img{transform:scale(1.06);}
.service-link-indicator{
  position:absolute;right:12px;bottom:12px;width:36px;height:36px;border-radius:50%;
  background:rgba(15,23,42,.55);color:#fff;display:flex;align-items:center;justify-content:center;
}
.service-body{padding:20px;}
.service-body .service-label{display:block;font-size:12px;font-weight:700;color:var(--accent);letter-spacing:.05em;margin-bottom:8px;text-transform:uppercase;}
.service-body h3{margin-bottom:0;}
@media (min-width:768px){ .service-grid{grid-template-columns:repeat(3,1fr);gap:24px;} }

/* ===== FAQ ===== */
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq-item{background:#fff;border-radius:var(--radius);overflow:hidden;}
.faq-question{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;min-height:44px;background:none;border:none;text-align:left;font-weight:700;font-size:16px;cursor:pointer;
}
.faq-question .icon{transition:transform .3s ease;color:var(--accent);}
.faq-item.is-open .faq-question .icon{transform:rotate(180deg);}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.faq-answer p{padding:0 20px 18px;color:#475569;}
.faq-item.is-open .faq-answer{max-height:300px;}

/* ===== CTA 섹션(푸터 위) ===== */
.cta-section{background:var(--text);color:#fff;text-align:center;}
.cta-section h2{color:#fff;margin-bottom:12px;}
.cta-section p{color:#CBD5E1;margin-bottom:24px;}
.cta-buttons{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;}

/* ===== 푸터 ===== */
.site-footer{background:#0B1220;color:#CBD5E1;padding:40px 0;}
.footer-inner{display:flex;flex-direction:column;gap:24px;}
.footer-brand{color:#fff;font-weight:700;font-size:17px;margin-bottom:6px;}
.footer-brand span{font-weight:400;color:#94A3B8;}
.footer-info p{margin-bottom:4px;font-size:14px;}
.footer-copy{margin-top:10px;color:#64748B;font-size:13px;}
.footer-nav{display:flex;gap:24px;}
.footer-nav a{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:#CBD5E1;}
@media (min-width:768px){
  .footer-inner{flex-direction:row;justify-content:space-between;align-items:flex-end;}
}

/* ===== 페이지 공통(서브페이지 헤더 여백) ===== */
.page-main{padding-top:var(--header-h);}
.page-hero{padding:48px 0 8px;}
.page-hero .section-label{margin-bottom:8px;}
.breadcrumb-none{display:none;}

/* ===== 세부페이지 대표 이미지 ===== */
.detail-img{border-radius:var(--radius);margin-bottom:24px;}

/* ===== 콘텐츠 카드형 구조화(세부페이지 공통) ===== */
.info-grid{display:grid;grid-template-columns:1fr;gap:16px;margin:24px 0;}
.info-card{background:#fff;border-radius:var(--radius);padding:20px;}
.info-card .info-icon{width:40px;height:40px;border-radius:10px;background:var(--bg-sub);color:var(--accent);display:flex;align-items:center;justify-content:center;margin-bottom:12px;}
.info-card h3{margin-bottom:8px;}
.info-card p{color:#475569;font-size:15px;}
.detail-block{margin-bottom:32px;}
.detail-block h2{margin-bottom:14px;}
.detail-block p{color:#334155;margin-bottom:12px;}
.area-tags{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0;}
.area-tags span{background:var(--bg-sub);border-radius:999px;padding:6px 14px;font-size:14px;font-weight:600;}
@media (min-width:768px){ .info-grid{grid-template-columns:repeat(3,1fr);} }

/* ===== 세부페이지 레이아웃 변형(단계 리스트/2단 특징) ===== */
.step-list{list-style:none;margin:24px 0;padding:0;display:flex;flex-direction:column;gap:0;}
.step-list li{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--bg-sub);}
.step-list li:last-child{border-bottom:none;}
.step-list .step-num{
  flex:none;width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;
}
.step-list h3{margin-bottom:6px;}
.step-list p{color:#475569;font-size:15px;}
.feature-cols{display:grid;grid-template-columns:1fr;gap:16px;margin:24px 0;}
.feature-item{display:flex;gap:14px;background:#fff;border-radius:var(--radius);padding:18px;}
.feature-item .info-icon{flex:none;margin-bottom:0;}
.feature-item h3{margin-bottom:6px;}
.feature-item p{color:#475569;font-size:15px;}
.callout-block{background:var(--bg-sub);border-radius:var(--radius);padding:22px;margin:24px 0;}
.callout-block p{color:#334155;}
@media (min-width:768px){ .feature-cols{grid-template-columns:repeat(2,1fr);} }

/* ===== 사이트맵 페이지 ===== */
.sitemap-group{margin-bottom:32px;}
.sitemap-group h2{margin-bottom:16px;}
.sitemap-list{display:grid;grid-template-columns:1fr;gap:10px;}
.sitemap-list a{
  display:flex;align-items:center;justify-content:space-between;background:#fff;border-radius:var(--radius);
  padding:16px 20px;min-height:44px;font-weight:600;
}
@media (min-width:768px){ .sitemap-list{grid-template-columns:repeat(2,1fr);} }

/* ===== contact 페이지 ===== */
.contact-card{background:#fff;border-radius:var(--radius);padding:28px;margin-bottom:20px;}
.contact-row{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--bg-sub);}
.contact-row:last-child{border-bottom:none;}
.contact-row .icon{color:var(--accent);}