:root{
  --primary:#5D7290;
  --primary-dark:#435875;
  --accent:#6E4FB2;
  --accent-dark:#573C90;
  --bg:#FAF8F2;
  --card:#FFFFFF;
  --text:#2E2E33;
  --muted:#6E6E74;
  --border:#E6E3DC;
  --surface:#EDEBE4;
  --success:#5D7290;
  --radius:16px;
  --shadow:0 10px 26px rgba(46,46,51,.10);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.68;
  font-size:16px;
  word-break:keep-all;
  overflow-wrap:break-word;
  padding-bottom:74px; /* space for sticky cta */
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
h1,h2,h3{line-height:1.35;margin:0 0 .6em;}
p{margin:0 0 1em;}
.container{max-width:1080px;margin:0 auto;padding:0 20px;}

/* top utility bar */
.top-bar{
  background:var(--primary-dark);
  color:#fff;
  text-align:center;
  font-size:14px;
  padding:8px 10px;
}
.top-bar__call{color:#fff;font-weight:700;letter-spacing:.2px;}

/* header / nav */
.site-header{
  background:#fff;
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:50;
}
.site-header__inner{
  max-width:1080px;margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.logo{font-weight:800;font-size:18px;color:var(--primary-dark);white-space:nowrap;}
.nav-toggle{
  display:none;background:none;border:1px solid var(--border);border-radius:8px;
  font-size:20px;padding:4px 10px;cursor:pointer;color:var(--text);
}
.site-nav{display:flex;flex-wrap:wrap;gap:4px 6px;justify-content:flex-end;}
.site-nav a{
  padding:8px 12px;border-radius:999px;font-size:14px;font-weight:600;color:var(--muted);white-space:nowrap;
}
.site-nav a:hover,.site-nav a.active{background:var(--bg);color:var(--primary-dark);}
.site-nav a.nav-cta{background:var(--accent);color:#fff;}
.site-nav a.nav-cta:hover,.site-nav a.nav-cta.active{background:var(--accent-dark);color:#fff;}

@media (max-width:860px){
  .nav-toggle{display:inline-block;}
  .site-nav{
    display:none;width:100%;flex-direction:column;gap:2px;
    order:3;padding-top:10px;border-top:1px solid var(--border);margin-top:10px;
  }
  .site-nav.open{display:flex;}
  .site-nav a{width:100%;padding:12px 14px;}
  .site-header__inner{flex-wrap:wrap;}
}

/* hero */
.hero{
  background:linear-gradient(180deg,var(--surface) 0%,var(--bg) 100%);
  padding:44px 0 32px;
}
.hero__inner{display:flex;align-items:center;gap:36px;}
.hero__text{flex:1 1 420px;min-width:0;}
.hero__media{flex:1 1 360px;min-width:0;}
.hero__media img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);aspect-ratio:4/3;object-fit:cover;}
@media (max-width:760px){
  .hero__inner{flex-direction:column-reverse;gap:20px;}
  .hero__media,.hero__text{flex:none;}
}
.hero h1{font-size:clamp(24px,6vw,40px);color:var(--primary-dark);font-weight:800;}
.hero__sub{font-size:16px;color:var(--muted);max-width:620px;}
.hero__cta{
  display:inline-flex;align-items:center;gap:8px;margin-top:18px;
  background:var(--accent);color:#fff;font-weight:800;font-size:16px;
  padding:15px 24px;border-radius:12px;box-shadow:var(--shadow);
}
.hero__cta:hover{background:var(--accent-dark);}
.hero__badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;}
.hero__badges span{
  background:#fff;border:1px solid var(--border);color:var(--primary-dark);
  font-size:12.5px;font-weight:700;padding:6px 12px;border-radius:999px;
}

/* section generic */
section.block{padding-top:36px;padding-bottom:36px;}
section.block h2{font-size:clamp(20px,5vw,28px);color:var(--text);}
section.block h2 .accent{color:var(--accent-dark);}
.lead{color:var(--muted);font-size:15.5px;margin-bottom:20px;}

/* checklist */
.check-list{list-style:none;padding:0;margin:0;display:grid;gap:10px;}
.check-list li{
  background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:14px 16px;display:flex;gap:10px;align-items:flex-start;font-size:15px;
}
.check-list li::before{content:"⚠️";flex:none;}
.check-list.ok li::before{content:"✅";}

/* process steps */
.steps{list-style:none;counter-reset:step;padding:0;margin:0;display:grid;gap:14px;}
.steps li{
  counter-increment:step;background:var(--card);border:1px solid var(--border);
  border-radius:14px;padding:16px 16px 16px 56px;position:relative;font-size:15px;
}
.steps li::before{
  content:counter(step);position:absolute;left:14px;top:18px;
  width:28px;height:28px;border-radius:50%;background:var(--primary);color:#fff;
  font-weight:800;display:flex;align-items:center;justify-content:center;font-size:13.5px;
}
.steps li strong{display:block;margin-bottom:3px;color:var(--text);}

/* before / after static cards */
.ba-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
@media (max-width:640px){.ba-grid{grid-template-columns:1fr;}}
.ba-card{
  border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);background:var(--card);
}
.ba-card__panel{
  height:230px;overflow:hidden;background:var(--surface);
}
.ba-card__panel img{width:100%;height:100%;object-fit:cover;display:block;}
.ba-card__label{
  position:relative;top:0;font-weight:800;font-size:13px;letter-spacing:.5px;
  padding:10px 16px 0;color:var(--muted);
}
.ba-card--before .ba-card__label{color:var(--accent-dark);}
.ba-card--after .ba-card__label{color:var(--primary-dark);}
.ba-card__text{padding:6px 16px 16px;font-size:14px;color:var(--muted);}
.ba-set{margin-bottom:18px;}
.ba-set__title{font-size:15px;font-weight:700;color:var(--text);margin:0 0 10px;}

.ba-slider__caption{font-size:13.5px;color:var(--muted);margin-top:10px;}

/* guarantee cards */
.guarantee-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
@media (max-width:860px){.guarantee-grid{grid-template-columns:repeat(2,1fr);}}
.guarantee-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:18px 14px;text-align:center;box-shadow:var(--shadow);
}
.guarantee-card__icon{font-size:30px;margin-bottom:8px;}
.guarantee-card h3{font-size:14.5px;margin-bottom:4px;}
.guarantee-card p{font-size:12.5px;color:var(--muted);margin:0;}

/* info box */
.info-box{
  background:var(--surface);border:1px solid var(--border);border-radius:14px;
  padding:16px 18px;font-size:14.5px;color:var(--primary-dark);margin:20px 0;
}

/* FAQ */
.faq-item{
  background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:4px 16px;margin-bottom:10px;
}
.faq-item summary{
  cursor:pointer;font-weight:700;padding:14px 0;list-style:none;position:relative;padding-right:26px;
  font-size:15.5px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";position:absolute;right:0;top:10px;font-size:20px;color:var(--primary);
}
.faq-item[open] summary::after{content:"–";}
.faq-item summary::before{content:"Q. ";color:var(--primary);}
.faq-item p{padding:0 0 16px;color:var(--muted);font-size:14.5px;}
.faq-item p::before{content:"A. ";color:var(--accent-dark);font-weight:800;}

/* mini cta */
.mini-cta{
  background:linear-gradient(135deg,var(--accent),var(--accent-dark));
  border-radius:var(--radius);padding:26px 20px;text-align:center;color:#fff;
}
.mini-cta h2{color:#fff;}
.mini-cta p{color:#EAE2F7;}
.mini-cta__buttons{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px;}
.mini-cta__buttons a{
  background:#fff;color:var(--accent-dark);font-weight:800;padding:13px 22px;border-radius:10px;
}
.mini-cta__buttons a.sms{background:var(--primary-dark);color:#fff;}

/* consult page big buttons */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0;}
@media (max-width:640px){.contact-grid{grid-template-columns:1fr;}}
.contact-card{
  border-radius:var(--radius);padding:26px 18px;text-align:center;color:#fff;box-shadow:var(--shadow);
}
.contact-card--call{background:linear-gradient(135deg,var(--primary),var(--primary-dark));}
.contact-card--sms{background:linear-gradient(135deg,var(--accent),var(--accent-dark));}
.contact-card__icon{font-size:36px;}
.contact-card__num{font-size:20px;font-weight:800;margin:6px 0;}
.contact-card__btn{
  display:inline-block;margin-top:10px;background:#fff;color:var(--text);
  font-weight:800;padding:12px 20px;border-radius:10px;
}
.biz-table{width:100%;border-collapse:collapse;font-size:14px;}
.biz-table th,.biz-table td{text-align:left;padding:10px 10px;border-bottom:1px solid var(--border);}
.biz-table th{width:120px;color:var(--muted);font-weight:600;}

/* 30초 타공 규격 셀프 진단기 (순수 CSS, JS 없음) */
.diag-tool{position:relative;}
.diag-tool__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;}
@media (max-width:760px){.diag-tool__grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:420px){.diag-tool__grid{grid-template-columns:1fr;}}
.diag-tool__radio{position:absolute;opacity:0;pointer-events:none;}
.diag-tool__card{
  display:block;cursor:pointer;background:var(--card);border:2px solid var(--border);
  border-radius:var(--radius);padding:16px 12px;text-align:center;font-weight:700;font-size:14.5px;
  transition:border-color .15s,background .15s;
}
.diag-tool__card span{display:block;font-weight:500;font-size:12px;color:var(--muted);margin-top:4px;}
.diag-tool__radio:checked + .diag-tool__card{border-color:var(--accent);background:var(--surface);color:var(--accent-dark);}
.diag-tool__results{margin-top:18px;}
.diag-tool__result{display:none;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px 18px;font-size:14.5px;}
.diag-tool__result strong{color:var(--accent-dark);}
.diag-tool__result a{display:inline-block;margin-top:10px;background:var(--accent);color:#fff;font-weight:800;padding:10px 18px;border-radius:10px;}
#diag-a:checked ~ .diag-tool__results #result-a,
#diag-b:checked ~ .diag-tool__results #result-b,
#diag-c:checked ~ .diag-tool__results #result-c,
#diag-d:checked ~ .diag-tool__results #result-d{display:block;}
.diag-tool__hint{font-size:13px;color:var(--muted);margin-top:10px;}

/* 위험도&노후도 체크리스트 (경량 JS) */
.risk-check{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;}
.risk-check__item{
  display:flex;gap:10px;align-items:flex-start;padding:12px 8px;border-radius:10px;
  font-size:14.5px;cursor:pointer;
}
.risk-check__item:hover{background:var(--bg);}
.risk-check__item input{margin-top:3px;width:18px;height:18px;flex:none;accent-color:var(--accent);}
.risk-check__result{
  display:none;margin-top:14px;background:var(--surface);border:1px solid var(--border);color:var(--accent-dark);
  border-radius:14px;padding:16px 16px;font-size:14.5px;font-weight:600;
}
.risk-check__result.show{display:block;}
.risk-check__result a{display:inline-block;margin-top:10px;background:var(--accent);color:#fff;font-weight:800;padding:10px 18px;border-radius:10px;}
.risk-check__count{font-size:13px;color:var(--muted);margin-top:10px;}

/* 시공사례 갤러리 */
.gallery-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
@media (max-width:760px){.gallery-grid{grid-template-columns:1fr;}}
.gallery-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);}
.gallery-card__title{font-weight:800;font-size:14.5px;margin:0 0 10px;}
.gallery-card__desc{font-size:13px;color:var(--muted);margin:10px 0 0;}
.gallery-single{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);}
.gallery-single img{width:100%;height:220px;object-fit:cover;}

/* floating back-to-main banner */
.back-to-main{
  position:fixed;right:0;top:50%;transform:translateY(-50%);z-index:55;
  display:flex;align-items:center;gap:6px;
  background:var(--primary-dark);color:#fff;
  padding:12px 16px 12px 14px;border-radius:999px 0 0 999px;
  box-shadow:var(--shadow);font-weight:700;font-size:13.5px;
}
.back-to-main:hover{background:var(--accent);}
.back-to-main__icon{font-size:16px;}
@media (max-width:640px){
  .back-to-main{top:auto;bottom:88px;transform:none;padding:10px 14px 10px 12px;}
  .back-to-main__label{display:none;}
}

/* bottom subpage nav */
.subpage-nav-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;}
.subpage-nav-card{position:relative;display:block;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);}
.subpage-nav-card img{width:100%;height:120px;object-fit:cover;transition:transform .25s;}
.subpage-nav-card:hover img{transform:scale(1.06);}
.subpage-nav-card span{
  position:absolute;left:0;right:0;bottom:0;padding:8px 10px 7px;
  background:linear-gradient(0deg,rgba(46,46,51,.82),rgba(46,46,51,0));
  color:#fff;font-size:12.5px;font-weight:700;line-height:1.3;
}
@media (max-width:860px){.subpage-nav-grid{grid-template-columns:repeat(3,1fr);}}
@media (max-width:640px){.subpage-nav-grid{grid-template-columns:repeat(2,1fr);}.subpage-nav-card img{height:100px;}}

/* footer */
.site-footer{background:var(--primary-dark);color:#D3DAE3;padding:26px 0 90px;margin-top:16px;font-size:13px;}
.site-footer__brand{color:#fff;font-weight:800;font-size:15px;margin-bottom:6px;}
.site-footer p{margin:2px 0;}

/* sticky bottom cta */
.sticky-cta{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  background:var(--accent);box-shadow:0 -6px 18px rgba(0,0,0,.15);
}
.sticky-cta__btn{
  display:flex;align-items:center;justify-content:center;gap:8px;
  color:#fff;font-weight:800;font-size:15.5px;padding:15px 10px;
}

/* mobile spacing tightening */
@media (max-width:640px){
  .container{padding:0 20px;}
  .hero{padding:32px 0 26px;}
  .hero__media img{aspect-ratio:3/2;}
  .gallery-single img{height:180px;}
  section.block{padding-top:28px;padding-bottom:28px;}
  .guarantee-card{padding:16px 10px;}
  .mini-cta{padding:22px 16px;}
}