/* 08 씽크대막힘 배수구 — 세로 스크롤 스토리 (1스텝 1섹션) */
:root{
  --bg:#EFF4F2;
  --ink:#22413C;
  --teal:#46897C;
  --sky:#A8CFC5;
  --deep:#0E2320;
  --font-display:"NanumSquareNeo","Pretendard",system-ui,-apple-system,"Malgun Gothic",sans-serif;
  --font-body:"Pretendard",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 var(--sky)}
.site-header .wrap{padding-block:16px}
.logo{font-family:var(--font-display);font-weight:800;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(--teal)}
.related-nav{font-size:12.5px;color:var(--teal)}

.hero{background:var(--deep);color:#fff;padding-block:64px 48px;text-align:center}
.hero .wrap{max-width:640px;margin-inline:auto}
.hero .eyebrow{font-size:12.5px;letter-spacing:.12em;color:var(--sky);font-weight:800}
.hero h1{font-family:var(--font-display);font-weight:800;font-size:clamp(28px,5vw,38px);margin-top:14px}
.hero .lead{margin-top:16px;font-size:16px;color:#C9DCD8}
.hero .cta-inline{margin-top:22px;display:inline-block;background:var(--sky);color:var(--deep);font-weight:800;padding:12px 26px}

/* 세로 스크롤 스토리 */
.story{padding-block:8px}
.story-step{padding-block:56px;border-bottom:1px solid var(--sky)}
.story-step:last-of-type{border-bottom:none}
.story-step .wrap{max-width:640px;margin-inline:auto;text-align:center}
.story-step .step-tag{display:inline-block;background:var(--teal);color:#fff;font-size:12px;font-weight:800;padding:4px 12px;font-family:var(--font-display)}
.story-step h2{font-family:var(--font-display);font-weight:800;font-size:24px;margin-top:14px}
.story-step p{margin-top:14px;text-align:left;max-width:60ch;margin-inline:auto}
.story-step p + p{margin-top:12px}

/* 배수구 상부 구조 분해 도식 */
.exploded{margin-top:32px;display:flex;flex-direction:column;align-items:center;gap:0}
.exploded .layer{width:70%;max-width:320px;background:#fff;border:2px solid var(--teal);padding:14px;text-align:center;font-family:var(--font-display);font-weight:800;font-size:14px;color:var(--ink)}
.exploded .layer span{display:block;font-family:var(--font-body);font-weight:400;font-size:12.5px;color:#4A6058;margin-top:4px}
.exploded .connector{width:2px;height:22px;background:var(--teal)}
.exploded .layer.l1{width:90%;max-width:380px}
.exploded .layer.l2{width:78%;max-width:340px}
.exploded .layer.l3{width:64%;max-width:290px;background:var(--sky);border-color:var(--deep)}

.safety-box{margin-top:24px;background:#fff;border-left:4px solid var(--teal);padding:18px 20px;text-align:left;max-width:60ch;margin-inline:auto}
.safety-box h3{font-family:var(--font-display);font-weight:800;font-size:15.5px;margin-bottom:8px}

figure{margin-top:28px;text-align:left}
figcaption{margin-top:10px;color:#4A6058;text-align:center}

.review-section{background:#fff;padding-block:56px}
.review-section h2{font-family:var(--font-display);font-weight:800;font-size:22px;text-align:center}
.review-list{margin-top:26px;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(--teal);font-weight:800}

.related-links{padding-block:40px}
.related-links p{font-weight:800;font-size:13.5px;color:var(--teal);margin-bottom:12px}
.related-links a{background:#fff;border:1px solid var(--sky);padding:8px 14px;font-size:14px}

.cta-block{background:var(--deep);color:#fff;padding-block:48px}
.cta-block .cta-heading{font-family:var(--font-display);font-weight:800;font-size:22px}
.cta-block a[href^="tel:"]{margin-top:18px;background:var(--sky);color:var(--deep);font-weight:800;padding:14px 30px;display:inline-block}

.site-footer{background:#081613;color:#9BB0AB;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%}}