/* ===== 기본 변수 ===== */
:root{
  --bg:#F8FAFC;
  --bg-sub:#CBD5E1;
  --accent:#06B6D4;
  --text:#0F172A;
  --radius:12px;
  --header-h:64px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Pretendard",-apple-system,BlinkMacSystemFont,sans-serif;
  font-size:16px;
  line-height:1.6;
}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;font-weight:700;}
h1{font-size:29px;line-height:1.35;}
h2{font-size:22px;line-height:1.4;}
h3{font-size:18px;line-height:1.4;}
p{margin:0;}
.container{max-width:1200px;margin:0 auto;padding:0 24px;}

section{padding:50px 0;}
.eyebrow{
  color:var(--accent);
  font-weight:700;
  font-size:13px;
  letter-spacing:.08em;
  margin-bottom:8px;
}
.section-head{margin-bottom:32px;}
.section-head h2{font-weight:700;}
.section-head .lead{margin-top:10px;color:#475569;font-weight:400;}
.lead{font-weight:400;color:#475569;}

/* ===== 버튼 ===== */
.cta-row{display:flex;gap:12px;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;border-radius:10px;
  font-weight:700;font-size:16px;white-space:nowrap;
  border:none;cursor:pointer;
}
.btn svg{width:24px;height:24px;flex:0 0 auto;}
.btn-primary{background:var(--accent);color:#fff;}
.btn-outline{background:transparent;color:var(--text);border:1px solid var(--bg-sub);}
.btn-block{width:100%;}
/* 히어로/상담CTA는 어두운 배경이라 outline 버튼을 밝은 색으로 뒤집음 */
.hero .btn-outline,
.consult-cta .btn-outline{color:#fff;border-color:rgba(255,255,255,.5);}

/* ===== 헤더 ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .25s ease,border-color .25s ease;
}
.site-header.is-scrolled{
  background:var(--bg);
  border-bottom:1px solid var(--bg-sub);
}
.header-inner{
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;
}
.header-spacer{height:var(--header-h);}
.logo{display:flex;align-items:center;gap:8px;}
.logo svg{width:32px;height:32px;}
.logo-text{font-weight:800;font-size:17px;letter-spacing:.02em;}
.nav-pc{display:none;align-items:center;gap:28px;}
.nav-pc a{display:flex;align-items:center;gap:6px;font-weight:600;}
.nav-pc a svg{width:20px;height:20px;}
.hamburger{
  width:44px;height:44px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  background:none;border:none;cursor:pointer;
}
.hamburger span{width:22px;height:2px;background:var(--text);transition:transform .25s ease,opacity .25s ease;}
.hamburger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.hamburger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.nav-mobile{
  max-height:0;overflow:hidden;
  background:var(--bg);
  transition:max-height .3s ease;
}
.nav-mobile.is-open{max-height:320px;border-bottom:1px solid var(--bg-sub);}
.nav-mobile a{display:flex;align-items:center;gap:10px;padding:14px 24px;font-weight:600;min-height:44px;}
.nav-mobile a svg{width:22px;height:22px;}

@media(min-width:768px){
  :root{--header-h:72px;}
  .nav-pc{display:flex;}
  .hamburger{display:none;}
  .nav-mobile{display:none;}
}

/* ===== 스크롤 리빌 ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease;}
.reveal.is-visible{opacity:1;transform:none;}

/* ===== 히어로 ===== */
.hero{
  position:relative;color:#fff;
  min-height:78vh;display:flex;align-items:center;
  background-size:cover;background-position:center;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(15,23,42,.65),rgba(15,23,42,.85));
}
.hero .container{position:relative;z-index:1;}
.hero h1{font-size:29px;color:#fff;}
.hero .lead{color:#E2E8F0;margin-top:16px;font-size:16px;}
.hero .cta-row{margin-top:28px;}
@media(min-width:768px){
  .hero h1{font-size:44px;}
  .hero .lead{font-size:18px;max-width:640px;}
}

/* ===== 카드 공통 ===== */
.card{
  background:#fff;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--bg-sub);
}
.card-body{padding:20px;}
.card-body h3{margin-bottom:8px;}
.card-body p{color:#475569;margin-top:8px;}
.icon-badge{
  width:48px;height:48px;border-radius:10px;
  background:rgba(6,182,212,.12);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.icon-badge svg{width:24px;height:24px;}

/* ===== 스와이프 슬라이더 (모바일 767px 이하) ===== */
.swipe-slider{
  display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:8px;margin:0 -24px;padding-left:24px;padding-right:24px;
  -webkit-overflow-scrolling:touch;
}
.swipe-slider::-webkit-scrollbar{display:none;}
.swipe-slider .slide{flex:0 0 100%;scroll-snap-align:start;}
.slider-dots{display:flex;justify-content:center;gap:8px;margin-top:16px;}
.slider-dots span{width:8px;height:8px;border-radius:50%;background:var(--bg-sub);}
.slider-dots span.is-active{background:var(--accent);}

@media(min-width:768px){
  .swipe-slider{display:grid;grid-template-columns:repeat(var(--cols,3),1fr);overflow:visible;margin:0;padding:0;}
  .swipe-slider .slide{flex:none;}
  .slider-dots{display:none;}
}

/* ===== 체크리스트 ===== */
.checklist .slide{background:#fff;border:1px solid var(--bg-sub);border-radius:var(--radius);padding:20px;}
.checklist .slide p{margin-top:8px;color:#475569;}

/* ===== 풀스크린 프로세스 ===== */
.process-banner{
  position:relative;background-size:cover;background-position:center;
  padding:60px 0;color:#fff;
}
.process-banner::before{content:"";position:absolute;inset:0;background:rgba(15,23,42,.72);}
.process-banner .container{position:relative;z-index:1;}
.process-banner h2{color:#fff;}
.process-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px;
}
.process-card{
  background:rgba(255,255,255,.1);backdrop-filter:blur(6px);
  border:1px solid rgba(255,255,255,.25);border-radius:var(--radius);
  padding:20px;
}
.process-card .num{color:var(--accent);font-weight:800;font-size:14px;}
.process-card h3{color:#fff;margin-top:6px;}
.process-card p{color:#CBD5E1;margin-top:8px;font-size:15px;}
@media(min-width:768px){
  .process-grid{grid-template-columns:repeat(3,1fr);}
}

/* ===== 서비스 그리드 ===== */
.service-grid{display:grid;grid-template-columns:1fr;gap:20px;margin-top:32px;}
.service-card{position:relative;display:block;}
.service-card .thumb{position:relative;aspect-ratio:4/3;overflow:hidden;border-radius:var(--radius) var(--radius) 0 0;}
.service-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.service-card:hover .thumb img{transform:scale(1.06);}
.service-card .arrow-btn{
  position:absolute;right:12px;bottom:12px;width:40px;height:40px;border-radius:50%;
  background:rgba(255,255,255,.85);color:var(--text);display:flex;align-items:center;justify-content:center;
}
@media(min-width:768px){
  .service-grid{grid-template-columns:repeat(3,1fr);}
}

/* ===== 품질 비교 ===== */
.compare-grid{display:grid;grid-template-columns:1fr;gap:20px;margin-top:32px;}
.compare-card{border-radius:var(--radius);padding:24px;}
.compare-card.bad{background:#fff;border:1px solid var(--bg-sub);}
.compare-card.good{background:var(--text);color:#fff;}
.compare-card h3{margin-bottom:14px;}
.compare-card.good h3{color:var(--accent);}
.compare-card ul li{position:relative;padding-left:18px;margin-top:10px;font-size:15px;}
.compare-card ul li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:currentColor;}
@media(min-width:768px){.compare-grid{grid-template-columns:1fr 1fr;}}

/* ===== 시공사례 그리드 ===== */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px;}
.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 .overlay{
  position:absolute;inset:0;background:rgba(15,23,42,.55);
  display:flex;align-items:flex-end;padding:16px;
  opacity:0;transition:opacity .3s ease;
}
.case-card:hover .overlay,.case-card:focus-within .overlay{opacity:1;}
.case-card .overlay span{color:#fff;font-weight:700;transform:translateY(10px);transition:transform .3s ease;}
.case-card:hover .overlay span{transform:none;}
@media(min-width:768px){.case-grid{grid-template-columns:repeat(3,1fr);}}

/* ===== FAQ ===== */
.faq-item{border-bottom:1px solid var(--bg-sub);}
.faq-item summary{
  padding:18px 4px;cursor:pointer;font-weight:700;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:44px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:22px;color:var(--accent);flex:0 0 auto;}
.faq-item[open] summary::after{content:"–";}
.faq-item p{padding:0 4px 18px;color:#475569;}

/* ===== 상담 CTA ===== */
.consult-cta{background:var(--text);color:#fff;text-align:center;}
.consult-cta h2{color:#fff;margin-top:8px;}
.consult-cta .lead{color:#CBD5E1;margin-top:12px;}
.consult-cta .cta-row{justify-content:center;margin-top:24px;}

/* ===== 푸터 ===== */
.site-footer{background:#fff;border-top:1px solid var(--bg-sub);padding:40px 0 16px;}
.footer-inner{display:flex;flex-direction:column;gap:24px;}
.footer-brand{font-weight:800;font-size:17px;}
.footer-brand span{color:var(--accent);margin-left:6px;font-size:14px;}
.footer-info p{margin-top:6px;color:#475569;font-size:14px;}
.footer-links{display:flex;gap:20px;flex-wrap:wrap;}
.footer-links a{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:600;min-height:44px;}
.footer-links a svg{width:20px;height:20px;}
.copyright{text-align:center;color:#94A3B8;font-size:13px;margin-top:16px;}
@media(min-width:768px){.footer-inner{flex-direction:row;justify-content:space-between;align-items:flex-start;}}

/* ===== 상세페이지 공통 ===== */
.page-hero{padding:130px 0 40px;}
.page-hero h1{margin-bottom:16px;}
.detail-body p{margin-top:16px;color:#334155;}
.detail-body h2{margin-top:40px;margin-bottom:12px;}
.detail-figure{margin-top:16px;border-radius:var(--radius);overflow:hidden;}
.info-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:20px;}
@media(min-width:768px){.info-grid{grid-template-columns:repeat(3,1fr);}}
.mt-32{margin-top:32px;}
.detail-list{margin-top:16px;}
.detail-list li{padding:10px 0;border-bottom:1px solid var(--bg-sub);}
.detail-list-ol{margin-top:16px;padding-left:20px;color:#334155;}
.detail-list-ol li{padding:8px 0;}
.detail-table{width:100%;border-collapse:collapse;margin-top:20px;}
.detail-table tr{border-bottom:1px solid var(--bg-sub);}
.detail-table tr:last-child{border-bottom:none;}
.detail-table td{padding:14px;}
.sitemap-list a{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 4px;border-bottom:1px solid var(--bg-sub);font-weight:600;min-height:44px;
}
.sitemap-group h2{margin:32px 0 4px;}