/* 10 씽크대막힘 배관 — 슬림 사이드 인덱스 + 단일 컬럼 */
:root{
  --bg:#F2F5F7;
  --ink:#37474F;
  --slate:#78909C;
  --amber:#FFB300;
  --deep:#263238;
  --font-display:"IBM Plex Sans KR","Noto Sans KR",system-ui,-apple-system,"Malgun Gothic",sans-serif;
  --font-body:"Noto Sans KR",system-ui,-apple-system,"Malgun Gothic",sans-serif;
}

body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.85}

.site-header{background:#fff;border-bottom:1px solid #DCE3E7}
.site-header .wrap{padding-block:16px}
.logo{font-family:var(--font-display);font-weight:700;font-size:18px;color:var(--deep)}
.site-header nav ul{font-size:13.5px}
.site-header nav a{color:var(--ink)}
.site-header nav a:hover,.site-header nav a:focus-visible{color:var(--slate)}
.related-nav{font-size:12.5px;color:var(--slate)}

.hero{background:var(--deep);color:#fff;padding-block:52px}
.hero .wrap{max-width:780px}
.hero .eyebrow{font-size:12.5px;letter-spacing:.1em;color:var(--amber);font-weight:700}
.hero h1{font-family:var(--font-display);font-weight:700;font-size:clamp(28px,5vw,38px);margin-top:14px}
.hero .lead{margin-top:16px;font-size:16.5px;color:#C4D0D6;max-width:56ch}
.hero .cta-inline{margin-top:22px;display:inline-block;background:var(--amber);color:var(--deep);font-weight:700;padding:12px 26px}

.pipe-layout{padding-block:52px}
.pipe-layout .wrap{display:grid;grid-template-columns:170px 1fr;gap:32px;align-items:start}

.side-index{position:sticky;top:20px;border-left:2px solid #DCE3E7}
.side-index a{display:block;padding:8px 0 8px 14px;font-size:13.5px;border-left:2px solid transparent;margin-left:-2px}
.side-index a:hover,.side-index a:focus-visible{border-color:var(--slate);color:var(--slate)}

@media (max-width:780px){
  .pipe-layout .wrap{grid-template-columns:1fr}
  .side-index{position:static;display:flex;flex-wrap:wrap;border-left:none;border-top:2px solid #DCE3E7;padding-top:10px}
  .side-index a{border-left:none;padding:6px 12px}
}

.pipe-body section{margin-top:44px;scroll-margin-top:16px}
.pipe-body section:first-child{margin-top:0}
.pipe-body h2{font-family:var(--font-display);font-weight:700;font-size:22px}
.pipe-body p{margin-top:14px;max-width:66ch}
.pipe-body p + p{margin-top:12px}

/* 계통 단면 도식 */
.cross-section{margin-top:24px;background:#fff;border:1px solid #DCE3E7;padding:20px}
.cross-section .seg-row{display:flex;align-items:stretch;gap:4px}
.cross-section .seg{flex:1;padding:16px 10px;text-align:center;font-size:12.5px;background:var(--bg);border:1px solid #DCE3E7}
.cross-section .seg strong{display:block;font-family:var(--font-display);font-size:13.5px;color:var(--deep);margin-bottom:4px}
.cross-section .seg.hl{background:var(--amber);border-color:var(--amber)}
.cross-section .arrow{align-self:center;color:#9AAAB2}

@media (max-width:600px){
  .cross-section .seg-row{flex-direction:column}
  .cross-section .arrow{transform:rotate(90deg);margin:2px auto}
}

.safety-box{margin-top:20px;background:#fff;border-left:4px solid var(--amber);padding:18px 20px}
.safety-box h3{font-family:var(--font-display);font-weight:700;font-size:15.5px;margin-bottom:8px}

figure{margin-top:26px}
figcaption{margin-top:10px;color:#5A6B73;text-align:center}

.review-section{background:#fff;padding-block:52px;border-top:1px solid #DCE3E7}
.review-section h2{font-family:var(--font-display);font-weight:700;font-size:21px;text-align:center}
.review-list{margin-top:24px;grid-template-columns:repeat(2,1fr)}
@media (max-width:640px){.review-list{grid-template-columns:1fr}}
.review-list blockquote{background:var(--bg);padding:16px;font-size:14.5px}
.review-list cite{display:block;margin-top:8px;font-style:normal;font-size:12.5px;color:var(--slate);font-weight:700}

.related-links{padding-block:36px}
.related-links p{font-weight:700;font-size:13.5px;color:var(--slate);margin-bottom:12px}
.related-links a{background:#fff;border:1px solid #DCE3E7;padding:8px 14px;font-size:14px}

.cta-block{background:var(--deep);color:#fff;padding-block:46px}
.cta-block .cta-heading{font-family:var(--font-display);font-weight:700;font-size:22px}
.cta-block a[href^="tel:"]{margin-top:18px;background:var(--amber);color:var(--deep);font-weight:700;padding:14px 30px;display:inline-block}

.site-footer{background:#151E22;color:#9BAAB0;padding-block:14px;font-size:13px}

.photo-row-section h2{font-family:var(--font-display);font-size:22px;font-weight:800;text-align:center;margin-bottom:24px}
.photo-row{display:flex;flex-wrap:wrap;justify-content:center;gap:16px;max-width:1000px;margin-inline:auto}
.photo-row figure{flex:1 1 200px;max-width:260px;margin:0}
.photo-row img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block;border-radius:8px}
@media (max-width:640px){.photo-row{flex-direction:column;align-items:center}.photo-row figure{max-width:400px;width:100%}}