/* ============================================================
   싱크대 배관 길잡이 — 공용 디자인 시스템
   (child theme + html.php 공용. 단일 소스)
   ============================================================ */
:root{
  --brand:#0e7a70; --brand-600:#0c6a61; --brand-700:#0a544d; --brand-800:#083f3a;
  --brand-050:#eaf5f3; --brand-100:#d3ebe7; --brand-200:#a9d7d0;
  --ink:#13211f; --body:#33433f; --muted:#67807b; --faint:#8ea39e;
  --line:#e4ece9; --line-2:#eef4f2;
  --bg:#ffffff; --bg-soft:#f6faf9; --bg-2:#eef5f3; --bg-dark:#0b2320;
  --warn:#b45309; --warn-bg:#fbf5ea; --warn-line:#ecd8b4;
  --danger:#b3392f; --danger-bg:#fbf1ef;
  --ok:#0e7a70;
  --r-xs:8px; --r-sm:12px; --r-md:16px; --r-lg:22px; --r-xl:28px; --r-full:999px;
  --sp-1:8px; --sp-2:16px; --sp-3:24px; --sp-4:32px; --sp-5:48px; --sp-6:64px; --sp-7:96px; --sp-8:128px;
  --sh-1:0 1px 2px rgba(13,45,41,.05),0 1px 3px rgba(13,45,41,.05);
  --sh-2:0 8px 24px rgba(13,45,41,.08);
  --sh-3:0 20px 52px rgba(13,45,41,.13);
  --maxw:1160px; --readw:768px;
  --font:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,system-ui,"Segoe UI",Roboto,"Noto Sans KR",sans-serif;
  --serif:"Noto Serif KR",Georgia,"Times New Roman",serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--body);background:var(--bg);
  font-size:17px;line-height:1.75;letter-spacing:-.01em;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand-600);text-decoration:none;transition:color .18s}
a:hover{color:var(--brand-800)}
h1,h2,h3,h4{color:var(--ink);line-height:1.32;letter-spacing:-.02em;font-weight:800;margin:0}
:focus-visible{outline:3px solid var(--brand-200);outline-offset:2px;border-radius:4px}
.sk-wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.sk-eyebrow{display:inline-block;font-size:.82rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--brand-600);background:var(--brand-050);
  padding:6px 12px;border-radius:var(--r-full)}

/* ---------- Buttons ---------- */
.sk-btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:.98rem;
  padding:13px 24px;border-radius:var(--r-full);border:1.5px solid transparent;cursor:pointer;
  transition:transform .18s,box-shadow .18s,background .18s,color .18s;min-height:48px}
.sk-btn--primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(14,122,112,.28)}
.sk-btn--primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-2px);box-shadow:0 10px 26px rgba(14,122,112,.34)}
.sk-btn--ghost{background:#fff;color:var(--brand-700);border-color:var(--line)}
.sk-btn--ghost:hover{border-color:var(--brand-200);background:var(--brand-050)}

/* ---------- Header ---------- */
.sk-header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.sk-header__in{max-width:var(--maxw);margin:0 auto;padding:0 24px;height:70px;
  display:flex;align-items:center;justify-content:space-between;gap:20px}
.sk-brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--ink);font-size:1.12rem;letter-spacing:-.02em}
.sk-brand__mark{width:38px;height:38px;flex:0 0 38px;display:block}
.sk-brand small{display:block;font-size:.68rem;font-weight:600;color:var(--muted);letter-spacing:.02em}
.sk-nav{display:flex;align-items:center;gap:4px}
.sk-nav a{color:var(--ink);font-weight:600;font-size:.96rem;padding:9px 14px;border-radius:var(--r-full)}
.sk-nav a:hover{background:var(--brand-050);color:var(--brand-700)}
.sk-nav__cta{margin-left:8px}
.sk-burger{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;
  background:#fff;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:4px}
.sk-burger span{width:18px;height:2px;background:var(--ink);border-radius:2px}
.sk-mnav{display:none}
@media(max-width:860px){
  .sk-nav{display:none}
  .sk-burger{display:flex}
  .sk-mnav{display:block;border-bottom:1px solid var(--line);background:#fff;padding:8px 24px 16px}
  .sk-mnav[hidden]{display:none}
  .sk-mnav a{display:block;padding:12px 8px;color:var(--ink);font-weight:600;border-bottom:1px solid var(--line-2)}
}

/* ---------- Footer ---------- */
.sk-footer{background:var(--bg-dark);color:#c6d6d2;margin-top:var(--sp-8);
  padding:var(--sp-6) 0 var(--sp-4)}
.sk-footer__in{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.sk-footer__top{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;
  padding-bottom:var(--sp-4);border-bottom:1px solid rgba(255,255,255,.1)}
.sk-footer h4{color:#fff;font-size:1.05rem;margin-bottom:14px}
.sk-footer p{margin:.35em 0;font-size:.92rem;color:#9fb4af}
.sk-footer a{color:#c6d6d2;font-size:.92rem;display:block;padding:5px 0}
.sk-footer a:hover{color:#fff}
.sk-footer__legal{margin-top:var(--sp-4);font-size:.82rem;color:#8aa39d;line-height:1.7}
.sk-footer__legal .legal-notice{background:rgba(255,255,255,.04);border-left:3px solid var(--brand);
  padding:12px 16px;border-radius:0 8px 8px 0;color:#a9bfba;margin:10px 0}
.sk-footer__legal .legal-notice p{color:#a9bfba;font-size:.82rem}
.sk-footer__copy{margin-top:var(--sp-3);padding-top:var(--sp-3);border-top:1px solid rgba(255,255,255,.08);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.85rem;color:#7e938e}
@media(max-width:760px){.sk-footer__top{grid-template-columns:1fr;gap:28px}}

/* ---------- Article / Page shell ---------- */
.sk-main{min-height:50vh}
.sk-hero-post{position:relative;background:var(--brand-800)}
.sk-hero-post__img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.42}
.sk-hero-post__scrim{position:relative;background:linear-gradient(180deg,rgba(8,63,58,.55),rgba(8,45,41,.86));
  padding:var(--sp-7) 0 var(--sp-6)}
.sk-hero-post__in{max-width:var(--readw);margin:0 auto;padding:0 24px;color:#fff}
.sk-hero-post .cat{display:inline-block;background:rgba(255,255,255,.16);color:#eafaf7;
  font-weight:700;font-size:.82rem;padding:6px 14px;border-radius:var(--r-full)}
.sk-hero-post h1{color:#fff;font-size:clamp(1.9rem,4.6vw,2.9rem);margin:18px 0 14px;line-height:1.22}
.sk-hero-post .meta{color:#bfe0da;font-size:.92rem;display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.sk-hero-post .meta span{display:inline-flex;align-items:center;gap:6px}

.sk-article{max-width:var(--readw);margin:0 auto;padding:var(--sp-5) 24px var(--sp-6)}
.sk-summary{background:var(--brand-050);border:1px solid var(--brand-100);border-radius:var(--r-md);
  padding:20px 24px;margin-bottom:var(--sp-4)}
.sk-summary strong{color:var(--brand-800)}
.sk-summary p{margin:0;color:var(--brand-800);font-size:1.02rem;line-height:1.7}

/* TOC */
.sk-toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--r-md);
  padding:20px 24px;margin-bottom:var(--sp-4)}
.sk-toc__t{font-size:.82rem;font-weight:800;letter-spacing:.1em;color:var(--muted);
  text-transform:uppercase;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.sk-toc__t::before{content:"";width:16px;height:2px;background:var(--brand);display:inline-block}
.sk-toc ol{margin:0;padding-left:0;list-style:none;counter-reset:toc}
.sk-toc li{counter-increment:toc;margin:2px 0}
.sk-toc a{display:block;padding:7px 8px 7px 34px;position:relative;color:var(--body);
  border-radius:8px;font-weight:600;font-size:.96rem}
.sk-toc a::before{content:counter(toc,decimal-leading-zero);position:absolute;left:8px;
  color:var(--brand);font-weight:800;font-size:.82rem;top:9px}
.sk-toc a:hover{background:var(--brand-050);color:var(--brand-700)}
.sk-toc li.lv3 a{padding-left:48px;font-weight:500;font-size:.92rem}
.sk-toc li.lv3 a::before{content:"–";left:34px;color:var(--faint)}

/* Content typography */
.sk-content{font-size:1.06rem;line-height:1.85;color:var(--body)}
.sk-content>h2{font-size:1.55rem;margin:2.4em 0 .7em;padding-top:.4em;position:relative;color:var(--ink)}
.sk-content>h2::before{content:"";display:block;width:44px;height:4px;border-radius:4px;
  background:linear-gradient(90deg,var(--brand),var(--brand-200));margin-bottom:18px}
.sk-content>h3{font-size:1.22rem;margin:1.9em 0 .6em;color:var(--brand-800)}
.sk-content p{margin:0 0 1.15em}
.sk-content strong{color:var(--ink);font-weight:700}
.sk-content a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--brand-200)}
.sk-content ul,.sk-content ol{margin:0 0 1.3em;padding-left:0}
.sk-content ul{list-style:none}
.sk-content ul>li{position:relative;padding-left:30px;margin:.55em 0}
.sk-content ul>li::before{content:"";position:absolute;left:6px;top:.72em;width:8px;height:8px;
  border-radius:2px;background:var(--brand);transform:rotate(45deg)}
.sk-content ol{list-style:none;counter-reset:li}
.sk-content ol>li{counter-increment:li;position:relative;padding-left:42px;margin:.7em 0}
.sk-content ol>li::before{content:counter(li);position:absolute;left:0;top:-2px;width:28px;height:28px;
  background:var(--brand-050);color:var(--brand-700);border:1.5px solid var(--brand-100);
  border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.85rem}
.sk-content figure{margin:1.8em 0}
.sk-content figure img{border-radius:var(--r-md);box-shadow:var(--sh-2);width:100%}
.sk-content figcaption{margin-top:10px;font-size:.88rem;color:var(--muted);text-align:center}

/* Tables */
.sk-content .sk-table{overflow-x:auto;margin:1.6em 0;border-radius:var(--r-md);
  border:1px solid var(--line);box-shadow:var(--sh-1);-webkit-overflow-scrolling:touch}
.sk-content table{width:100%;border-collapse:collapse;font-size:.96rem;min-width:520px;background:#fff}
.sk-content thead th{background:var(--brand-800);color:#eafaf7;font-weight:700;text-align:left;
  padding:13px 16px;font-size:.92rem;letter-spacing:-.01em}
.sk-content tbody td,.sk-content tbody th{padding:12px 16px;border-top:1px solid var(--line);
  vertical-align:top;text-align:left}
.sk-content tbody tr:nth-child(even){background:var(--bg-soft)}
.sk-content tbody th{font-weight:700;color:var(--ink);background:var(--bg-2)}

/* Callouts */
.sk-callout{border-radius:var(--r-md);padding:18px 22px;margin:1.7em 0;border:1px solid var(--brand-100);
  background:var(--brand-050)}
.sk-callout__t{font-weight:800;color:var(--brand-800);margin-bottom:6px;display:flex;align-items:center;gap:9px}
.sk-callout__t::before{content:"";width:18px;height:18px;border-radius:6px;background:var(--brand);flex:0 0 18px}
.sk-callout p:last-child{margin-bottom:0}
.sk-callout--warn{background:var(--warn-bg);border-color:var(--warn-line)}
.sk-callout--warn .sk-callout__t{color:var(--warn)}
.sk-callout--warn .sk-callout__t::before{background:var(--warn)}
.sk-content blockquote{margin:1.8em 0;padding:22px 26px;background:var(--bg-2);
  border-left:5px solid var(--brand);border-radius:0 var(--r-md) var(--r-md) 0;
  font-family:var(--serif);font-size:1.12rem;line-height:1.7;color:var(--brand-800)}
.sk-content blockquote p{margin:0}

/* Inline CSS charts */
.sk-bars{margin:1.7em 0;border:1px solid var(--line);border-radius:var(--r-md);padding:20px 22px;background:#fff;box-shadow:var(--sh-1)}
.sk-bars__cap{font-weight:800;color:var(--ink);font-size:1rem;margin-bottom:4px}
.sk-bars__sub{font-size:.85rem;color:var(--muted);margin-bottom:16px}
.sk-bar{margin:11px 0}
.sk-bar__row{display:flex;justify-content:space-between;font-size:.9rem;margin-bottom:5px;color:var(--ink);font-weight:600}
.sk-bar__row span:last-child{color:var(--brand-700);font-weight:700}
.sk-bar__track{height:12px;background:var(--bg-2);border-radius:var(--r-full);overflow:hidden}
.sk-bar__fill{height:100%;border-radius:var(--r-full);
  background:linear-gradient(90deg,var(--brand-200),var(--brand));transition:width .6s ease}
/* Step diagram */
.sk-steps{counter-reset:st;margin:1.7em 0;display:grid;gap:12px}
.sk-step{display:grid;grid-template-columns:44px 1fr;gap:16px;align-items:start;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:16px 18px;box-shadow:var(--sh-1);position:relative}
.sk-step::before{counter-increment:st;content:counter(st);width:44px;height:44px;border-radius:50%;
  background:var(--brand);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:1.05rem}
.sk-step h4{font-size:1.02rem;margin:2px 0 4px;color:var(--ink)}
.sk-step p{margin:0;font-size:.95rem;color:var(--muted)}

/* notices */
.ai-notice{font-size:0.85em;color:#888;margin-top:2em}
.legal-notice{font-size:0.85em;color:#777;background:#f8f9fa;border-left:3px solid #cbd5e1;
  padding:10px 14px;margin-top:2em;border-radius:0 6px 6px 0}
.legal-notice p{margin:4px 0}

/* Related posts */
.sk-related{background:var(--bg-soft);border-top:1px solid var(--line);padding:var(--sp-6) 0}
.sk-related__in{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.sk-related__h{font-size:1.4rem;margin-bottom:24px;color:var(--ink)}
.sk-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sk-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
  box-shadow:var(--sh-1);transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column}
.sk-card:hover{transform:translateY(-4px);box-shadow:var(--sh-3)}
.sk-card__thumb{aspect-ratio:16/10;overflow:hidden;background:var(--bg-2)}
.sk-card__thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.sk-card:hover .sk-card__thumb img{transform:scale(1.05)}
.sk-card__body{padding:18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.sk-card__cat{font-size:.76rem;font-weight:700;color:var(--brand-600);letter-spacing:.02em}
.sk-card__title{font-size:1.05rem;font-weight:700;color:var(--ink);line-height:1.4;margin:0}
.sk-card__ex{font-size:.9rem;color:var(--muted);margin:0;line-height:1.6}
@media(max-width:860px){.sk-cards{grid-template-columns:1fr 1fr;gap:16px}}
@media(max-width:560px){.sk-cards{grid-template-columns:1fr}}

/* Archive / listing */
.sk-listing{max-width:var(--maxw);margin:0 auto;padding:var(--sp-6) 24px}
.sk-listing__head{text-align:center;margin-bottom:var(--sp-5)}
.sk-listing__head h1{font-size:clamp(1.7rem,4vw,2.4rem);margin:12px 0}
.sk-listing__head p{color:var(--muted);max-width:600px;margin:0 auto}
.sk-pagination{display:flex;gap:8px;justify-content:center;margin-top:var(--sp-5);flex-wrap:wrap}
.sk-pagination a,.sk-pagination span{min-width:44px;height:44px;display:inline-flex;align-items:center;
  justify-content:center;border:1px solid var(--line);border-radius:12px;font-weight:700;color:var(--ink)}
.sk-pagination .current{background:var(--brand);color:#fff;border-color:var(--brand)}

/* Page (privacy/terms) */
.sk-page{max-width:var(--readw);margin:0 auto;padding:var(--sp-5) 24px var(--sp-6)}
.sk-page h1{font-size:clamp(1.7rem,4vw,2.3rem);margin-bottom:8px}
.sk-page__meta{color:var(--muted);font-size:.9rem;margin-bottom:var(--sp-4);padding-bottom:var(--sp-3);border-bottom:1px solid var(--line)}

@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}