/* ============================================================
   아파트 단열필름 — 디자인 시스템 (v1.0)
   창문 단열 연구소 / 2026-08
   ============================================================ */
:root{
  --c-navy:#12263F; --c-navy-deep:#0E1E33; --c-navy-soft:#1B3554;
  --c-blue:#3E8FD9; --c-blue-deep:#2B6FAA; --c-blue-soft:#7FB5E8;
  --c-teal:#2E9E8F; --c-amber:#E5A23C; --c-orange:#E0724A;
  --c-ink:#16222E; --c-body:#3D4C5C; --c-muted:#64748B;
  --c-line:#E3EAF1; --c-bg:#FFFFFF; --c-bg-soft:#F2F5F8; --c-bg-tint:#EAF3FB;
  --r-sm:8px; --r-md:14px; --r-lg:22px; --r-xl:34px;
  --sh-sm:0 1px 2px rgba(18,38,63,.06), 0 4px 12px rgba(18,38,63,.06);
  --sh-md:0 2px 6px rgba(18,38,63,.06), 0 14px 36px rgba(18,38,63,.10);
  --sh-lg:0 8px 24px rgba(18,38,63,.10), 0 28px 70px rgba(18,38,63,.16);
  --f-display:"Noto Serif KR",serif;
  --f-body:"Pretendard",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans KR",sans-serif;
  --sp-1:8px; --sp-2:16px; --sp-3:24px; --sp-4:32px; --sp-5:40px; --sp-6:56px; --sp-7:72px; --sp-8:96px; --sp-9:120px; --sp-10:140px;
  --maxw:1180px; --maxw-prose:768px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--f-body);color:var(--c-body);background:var(--c-bg);font-size:16.5px;line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--c-blue-deep);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--c-navy)}
h1,h2,h3,h4{font-family:var(--f-display);color:var(--c-navy);line-height:1.35;letter-spacing:-.015em;font-weight:700;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(2.1rem,4.6vw,3.4rem);line-height:1.22}
h2{font-size:clamp(1.5rem,2.6vw,2.05rem);line-height:1.3}
h3{font-size:clamp(1.15rem,1.7vw,1.35rem);line-height:1.45}
p{margin:0 0 1.15em}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:var(--sp-7) 0}
@media(min-width:900px){.section{padding:var(--sp-9) 0}}
.section-head{max-width:640px;margin-bottom:var(--sp-5)}
.section-head .kicker{display:inline-flex;align-items:center;gap:8px;font-size:.82rem;font-weight:700;letter-spacing:.08em;color:var(--c-blue-deep);text-transform:uppercase;margin-bottom:14px}
.section-head .kicker::before{content:"";width:26px;height:2px;background:var(--c-blue);border-radius:2px}
.section-head p.lead{font-size:1.05rem;color:var(--c-muted);margin:0}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.09em;color:var(--c-blue-deep);text-transform:uppercase;margin-bottom:12px}
/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 26px;border-radius:999px;font-weight:600;font-size:.98rem;border:1.5px solid transparent;cursor:pointer;transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease),color .2s var(--ease);text-decoration:none}
.btn-primary{background:var(--c-navy);color:#fff}
.btn-primary:hover{background:var(--c-navy-soft);color:#fff;transform:translateY(-2px);box-shadow:var(--sh-md)}
.btn-accent{background:var(--c-blue);color:#fff}
.btn-accent:hover{background:var(--c-blue-deep);color:#fff;transform:translateY(-2px);box-shadow:var(--sh-md)}
.btn-ghost{background:transparent;color:var(--c-navy);border-color:var(--c-line)}
.btn-ghost:hover{border-color:var(--c-navy);color:var(--c-navy);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--c-navy)}
.btn-light:hover{background:var(--c-bg-soft);transform:translateY(-2px);box-shadow:var(--sh-md)}
/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--c-line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand-mark{width:42px;height:42px;border-radius:12px;box-shadow:var(--sh-sm);flex:none}
.brand-name{font-family:var(--f-display);font-weight:700;font-size:1.06rem;color:var(--c-navy);letter-spacing:-.01em;line-height:1.2}
.brand-sub{display:block;font-family:var(--f-body);font-size:.72rem;font-weight:600;color:var(--c-muted);letter-spacing:.02em}
.main-nav{display:none;align-items:center;gap:4px}
.main-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;font-size:.95rem;font-weight:600;color:var(--c-body);border-radius:10px}
.main-nav a:hover{color:var(--c-navy);background:var(--c-bg-soft)}
.main-nav a.current{color:var(--c-blue-deep)}
.header-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;border:1px solid var(--c-line);border-radius:12px;background:#fff;cursor:pointer;color:var(--c-navy)}
.nav-toggle svg{width:22px;height:22px}
@media(min-width:1024px){.main-nav{display:flex}.nav-toggle{display:none}}
.mobile-nav{display:none;position:fixed;inset:0;z-index:120;background:rgba(14,30,51,.4)}
.mobile-nav.open{display:block}
.mobile-nav-panel{position:absolute;top:0;right:0;bottom:0;width:min(86vw,360px);background:#fff;padding:24px;box-shadow:var(--sh-lg);overflow-y:auto}
.mobile-nav-panel a{display:block;padding:14px 8px;font-weight:600;color:var(--c-navy);border-bottom:1px solid var(--c-line)}
/* ---------- hero ---------- */
.hero{position:relative;background:var(--c-navy-deep);color:#fff;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 480px at 78% 12%,rgba(63,143,217,.34),transparent 62%),radial-gradient(720px 420px at 8% 92%,rgba(46,158,143,.20),transparent 60%)}
.hero-grid{position:relative;display:grid;grid-template-columns:1fr;gap:40px;padding:var(--sp-7) 0 var(--sp-8);align-items:center}
@media(min-width:960px){.hero-grid{grid-template-columns:1.05fr .95fr;gap:64px;padding:var(--sp-9) 0 var(--sp-10)}}
.hero h1{color:#fff;margin:0 0 18px}
.hero .lead{font-size:1.1rem;line-height:1.8;color:#C8D6E4;max-width:520px;margin:0 0 30px}
.hero-ctas{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:38px}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:520px}
.hero-stat{border-left:2px solid rgba(127,181,232,.45);padding-left:16px}
.hero-stat b{display:block;font-family:var(--f-display);font-size:1.5rem;color:#fff;line-height:1.2}
.hero-stat span{font-size:.82rem;color:#9FB2C4}
.hero-visual{position:relative}
.hero-visual .frame{border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--sh-lg);border:1px solid rgba(255,255,255,.14);aspect-ratio:16/11;background:var(--c-navy-soft)}
.hero-visual img{width:100%;height:100%;object-fit:cover}
.hero-badge{position:absolute;left:22px;bottom:22px;display:inline-flex;align-items:center;gap:10px;background:rgba(14,30,51,.82);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.16);color:#fff;padding:12px 18px;border-radius:14px;font-size:.86rem;font-weight:600;box-shadow:var(--sh-md)}
.hero-badge svg{width:20px;height:20px;color:var(--c-blue-soft)}
/* ---------- cards ---------- */
.card{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.card:hover{transform:translateY(-5px);box-shadow:var(--sh-md)}
.card-media{aspect-ratio:16/10;overflow:hidden;background:var(--c-bg-soft)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.card:hover .card-media img{transform:scale(1.045)}
.card-body{padding:22px 22px 24px}
.card-tag{display:inline-block;font-size:.74rem;font-weight:700;letter-spacing:.04em;color:var(--c-blue-deep);background:var(--c-bg-tint);padding:4px 10px;border-radius:999px;margin-bottom:12px}
.card h3{font-size:1.08rem;margin-bottom:8px}
.card h3 a{color:var(--c-navy)}
.card h3 a:hover{color:var(--c-blue-deep)}
.card p{font-size:.9rem;color:var(--c-muted);margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;gap:8px;margin-top:16px;font-size:.8rem;color:var(--c-muted)}
/* ---------- post grid ---------- */
.post-grid{display:grid;grid-template-columns:1fr;gap:22px}
@media(min-width:640px){.post-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.post-grid{grid-template-columns:repeat(3,1fr)}}
.post-grid .card.wide{grid-column:1/-1}
/* ---------- carousel ---------- */
.carousel-wrap{position:relative}
.carousel-track{display:grid;grid-auto-flow:column;grid-auto-columns:100%;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;border-radius:var(--r-xl)}
.carousel-track::-webkit-scrollbar{display:none}
.carousel-slide{scroll-snap-align:center;position:relative;border-radius:var(--r-xl);overflow:hidden;aspect-ratio:16/9;background:var(--c-navy-soft)}
.carousel-slide img{width:100%;height:100%;object-fit:cover}
.carousel-slide::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 42%,rgba(14,30,51,.78))}
.carousel-cap{position:absolute;left:26px;right:26px;bottom:22px;z-index:2;color:#fff}
.carousel-cap .cnum{font-size:.76rem;font-weight:700;letter-spacing:.1em;color:var(--c-blue-soft);display:block;margin-bottom:6px}
.carousel-cap h3{color:#fff;margin:0 0 6px;font-size:1.15rem}
.carousel-cap p{color:#D7E2EC;font-size:.9rem;margin:0}
.carousel-nav{display:flex;gap:10px;margin-top:22px}
.carousel-btn{width:46px;height:46px;border-radius:50%;border:1px solid var(--c-line);background:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;color:var(--c-navy);transition:background .2s,color .2s,transform .2s}
.carousel-btn:hover{background:var(--c-navy);color:#fff;transform:translateY(-2px)}
/* ---------- split sections ---------- */
.split{display:grid;grid-template-columns:1fr;gap:40px;align-items:center}
@media(min-width:960px){.split{grid-template-columns:1fr 1fr;gap:72px}}
.split .media{border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--sh-md);aspect-ratio:4/3;background:var(--c-bg-soft)}
.split .media img{width:100%;height:100%;object-fit:cover}
.split .media.ratio-16-9{aspect-ratio:16/9}
.feature-list{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:14px}
.feature-list li{display:flex;gap:12px;align-items:flex-start;font-size:.95rem}
.feature-list li svg{flex:none;width:20px;height:20px;color:var(--c-teal);margin-top:3px}
/* ---------- infographic band ---------- */
.band{background:var(--c-bg-soft)}
.band-tint{background:var(--c-bg-tint)}
.band-navy{background:var(--c-navy-deep);color:#fff}
.band-navy h2,.band-navy h3{color:#fff}
.band-navy p{color:#C8D6E4}
.media-card{background:#fff;border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--sh-md)}
.media-card img{width:100%}
.media-card .cap{padding:16px 22px;font-size:.86rem;color:var(--c-muted);border-top:1px solid var(--c-line)}
/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:1fr;gap:18px;counter-reset:step}
@media(min-width:760px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.steps{grid-template-columns:repeat(4,1fr)}}
.step{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-lg);padding:24px;position:relative;box-shadow:var(--sh-sm)}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:var(--c-blue);color:#fff;font-weight:700;font-size:.92rem;margin-bottom:14px}
.step h3{font-size:1rem;margin-bottom:6px}
.step p{font-size:.88rem;color:var(--c-muted);margin:0}
/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px;max-width:820px}
.faq details{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);padding:0 22px;transition:box-shadow .2s}
.faq details[open]{box-shadow:var(--sh-sm)}
.faq summary{cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0;font-weight:600;color:var(--c-navy);min-height:44px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--c-blue);transition:transform .25s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .faq-a{padding:0 0 20px;font-size:.95rem;color:var(--c-body)}
/* ---------- CTA band ---------- */
.cta-band{position:relative;overflow:hidden;background:linear-gradient(120deg,var(--c-navy) 0%,var(--c-navy-soft) 60%,var(--c-blue-deep) 130%);border-radius:var(--r-xl);padding:clamp(40px,7vw,72px);color:#fff;text-align:center}
.cta-band h2{color:#fff;font-size:clamp(1.5rem,3vw,2.2rem);margin-bottom:12px}
.cta-band p{color:#C8D6E4;max-width:560px;margin:0 auto 28px}
/* ---------- footer ---------- */
.site-footer{background:var(--c-navy-deep);color:#B9C8D6;padding:var(--sp-7) 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px;padding-bottom:var(--sp-6)}
@media(min-width:900px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:56px}}
.footer-brand .brand-name{color:#fff}
.footer-brand p{font-size:.9rem;max-width:360px;margin-top:14px}
.footer h4{color:#fff;font-size:.95rem;margin-bottom:16px}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.footer-links a{color:#B9C8D6;font-size:.9rem;display:inline-flex;align-items:center;min-height:36px}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:22px 0}
.footer-legal{font-size:.78rem;color:#8CA0B2;line-height:1.7;display:grid;gap:10px}
.footer-legal p{margin:0}
.footer-legal .legal-block{background:rgba(255,255,255,.05);border-left:3px solid rgba(127,181,232,.5);padding:12px 14px;border-radius:0 10px 10px 0}
.footer-meta{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;margin-top:16px;font-size:.78rem;color:#8CA0B2}
.footer-meta a{color:#8CA0B2;text-decoration:underline;text-underline-offset:3px}
/* ---------- article (single) ---------- */
.article-hero{background:var(--c-bg-soft);padding:var(--sp-6) 0 var(--sp-5);border-bottom:1px solid var(--c-line)}
.article-hero .crumbs{font-size:.84rem;color:var(--c-muted);margin-bottom:16px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.article-hero .crumbs a{color:var(--c-muted)}
.article-hero .crumbs a:hover{color:var(--c-blue-deep)}
.article-hero h1{font-size:clamp(1.7rem,3.4vw,2.6rem);max-width:820px}
.article-hero .meta{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;font-size:.88rem;color:var(--c-muted);margin-top:18px}
.post-thumb{aspect-ratio:16/9;overflow:hidden;border-radius:var(--r-xl);box-shadow:var(--sh-md);margin:0 0 34px}
.post-thumb img{width:100%;height:100%;object-fit:cover}
.article-body{max-width:var(--maxw-prose);margin:0 auto;padding:var(--sp-5) 0 var(--sp-6)}
.article-body p{line-height:1.85;margin-bottom:1.3em}
.article-body h2{margin-top:2.4em;margin-bottom:.8em;padding-top:.4em}
.article-body h3{margin-top:1.8em;margin-bottom:.7em;font-family:var(--f-body);font-weight:700;letter-spacing:0}
.article-body ul,.article-body ol{padding-left:1.25em;margin:0 0 1.5em;display:grid;gap:8px}
.article-body li::marker{color:var(--c-blue)}
.article-body a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(43,111,170,.4)}
.article-body a:hover{text-decoration-color:var(--c-navy)}
.article-body figure{margin:2em 0}
.article-body figure img{border-radius:var(--r-lg);box-shadow:var(--sh-md);width:100%}
.article-body figcaption{font-size:.84rem;color:var(--c-muted);text-align:center;margin-top:10px}
.article-body blockquote{margin:2em 0;padding:20px 24px;border-left:4px solid var(--c-blue);background:var(--c-bg-tint);border-radius:0 var(--r-md) var(--r-md) 0;color:var(--c-navy);font-weight:500}
.article-body blockquote p{margin:0}
.article-body table{width:100%;border-collapse:separate;border-spacing:0;font-size:.9rem;margin:2em 0}
.article-body table caption{caption-side:bottom;font-size:.8rem;color:var(--c-muted);padding-top:10px}
.article-body thead th{background:var(--c-navy);color:#fff;text-align:left;padding:12px 14px;font-weight:600;white-space:nowrap}
.article-body tbody td{padding:11px 14px;border-bottom:1px solid var(--c-line);vertical-align:top}
.article-body tbody tr:nth-child(even){background:var(--c-bg-soft)}
.article-body tbody tr:hover{background:var(--c-bg-tint)}
.article-body table th:first-child{border-radius:var(--r-sm) 0 0 0}
.article-body table th:last-child{border-radius:0 var(--r-sm) 0 0}
.article-body .chart{background:var(--c-bg-soft);border:1px solid var(--c-line);border-radius:var(--r-md);padding:22px 22px 18px;margin:2em 0}
.article-body .chart-title{font-weight:700;color:var(--c-navy);margin-bottom:16px;font-size:.95rem}
.article-body .chart-row{display:grid;grid-template-columns:110px 1fr 96px;align-items:center;gap:12px;margin-bottom:12px;font-size:.86rem}
.article-body .chart-label{color:var(--c-body);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.article-body .chart-val{color:var(--c-muted);text-align:right;white-space:nowrap}
.article-body .chart-bar{height:12px;border-radius:999px;background:linear-gradient(90deg,var(--c-blue),var(--c-blue-soft));width:var(--w);opacity:.9}
.article-body .legal-notice,.article-body .ai-notice{margin-top:2.4em}
.article-body .legal-notice{border-radius:0 8px 8px 0}
/* ---------- related / page ---------- */
.related{padding:var(--sp-6) 0}
.related .post-grid{margin-top:0}
.page-prose{max-width:var(--maxw-prose);margin:0 auto;padding:var(--sp-6) 0 var(--sp-8)}
.page-prose h1{font-size:clamp(1.8rem,3.4vw,2.6rem);margin-bottom:8px}
.page-prose .updated{font-size:.84rem;color:var(--c-muted);margin-bottom:32px}
.page-prose h2{margin-top:1.8em}
.page-prose ul,.page-prose ol{padding-left:1.25em}
.page-prose li{margin-bottom:8px}
/* ---------- archive ---------- */
.archive-head{background:var(--c-bg-soft);padding:var(--sp-6) 0;border-bottom:1px solid var(--c-line)}
.archive-head h1{font-size:clamp(1.7rem,3.2vw,2.4rem)}
.archive-body{padding:var(--sp-6) 0 var(--sp-8)}
/* ---------- misc ---------- */
.skip-link{position:absolute;left:-999px;top:0;z-index:200;background:var(--c-navy);color:#fff;padding:12px 18px;border-radius:0 0 12px 0}
.skip-link:focus{left:0}
:focus-visible{outline:3px solid var(--c-blue);outline-offset:2px;border-radius:4px}
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
  .card:hover,.btn:hover{transform:none}
}
@media(max-width:640px){
  .hero-ctas .btn{flex:1 1 auto}
  .hero-stats{grid-template-columns:1fr 1fr 1fr;gap:12px}
  .article-body .chart-row{grid-template-columns:88px 1fr 74px;gap:8px;font-size:.78rem}
  .footer-bottom{padding:20px 0 26px}
}
.article-body .table-wrap{overflow-x:auto;margin:2em 0;-webkit-overflow-scrolling:touch}
.article-body .table-wrap table{margin:0;min-width:520px}