:root{--ink:#202a2e;--gold:#b18a3e;--line:#dedfdb;--muted:#657075;--bg:#f4f5f3}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);font-family:Arial,'Noto Sans KR','Apple SD Gothic Neo','Malgun Gothic',sans-serif;font-size:16px;line-height:1.7;word-break:keep-all}a{color:inherit;text-decoration:none}button,summary,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:5px}.wrap{max-width:1260px;margin:auto;padding-left:40px;padding-right:40px}.skip{position:absolute;top:-100px;z-index:99;background:white;padding:10px}.skip:focus{top:0}.preview-note{background:#eef0ed;padding:7px 24px;text-align:center;font-size:13px;color:#535e63}.preview-note span{margin-left:16px;color:#687276}header{height:88px;padding:0 40px;display:flex;align-items:center;justify-content:space-between;gap:30px;position:sticky;top:0;z-index:20;background:#fffefdf5;backdrop-filter:blur(15px);border-bottom:1px solid #e6e8e5}.brand{display:flex;align-items:baseline;gap:13px;font-size:26px;font-weight:850;letter-spacing:1.5px}.brand span{font-size:12px;letter-spacing:0;color:#788181;font-weight:500}nav{display:flex;align-items:center;gap:27px;font-size:14px;font-weight:600}nav>a:not(.button):hover{color:var(--gold)}.button{display:inline-flex;align-items:center;justify-content:center;gap:28px;min-height:54px;padding:13px 27px;background:var(--gold);color:#fff;font-size:15px;font-weight:700;border:1px solid var(--gold);transition:background .2s}.button:hover{background:#947132}.button.small{min-height:44px;padding:9px 19px;font-size:14px}.button.outline{background:transparent;border-color:#ffffff80}.button.outline:hover{background:#ffffff18}.menu-toggle{display:none}.hero{position:relative;min-height:620px;color:white;display:flex;flex-direction:column;justify-content:center;overflow:hidden;background:#394748}.hero-image,.hero-shade{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.hero-image{object-position:center 55%}.hero-shade{background:linear-gradient(90deg,rgba(13,26,30,.87),rgba(13,26,30,.40) 58%,rgba(13,26,30,.15))}.hero-content{position:relative;width:100%;padding-top:70px;padding-bottom:110px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:2px;color:var(--gold);margin:0 0 20px}.hero .eyebrow{color:#e0bf7b}h1{font-size:clamp(38px,4.2vw,60px);line-height:1.27;letter-spacing:-2px;margin:0 0 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var(--line)}.service:first-child{padding-left:0}.service:last-child{border:0}.service summary{display:flex;flex-direction:column;list-style:none;cursor:pointer;position:relative}.service summary::-webkit-details-marker{display:none}.number{font-size:14px;color:var(--gold);margin-bottom:24px}.service-name{font-size:21px;font-weight:700;letter-spacing:-.5px}.service-desc{font-size:14px;color:var(--muted);margin-top:10px;max-width:185px}.plus{position:absolute;right:0;top:0;font-size:25px;color:#8a918e}.service[open] .plus{transform:rotate(45deg)}.service>p{font-size:14px;margin-top:25px;color:var(--muted)}.service>a{font-size:14px;color:var(--gold);font-weight:700}.cases-section{background:var(--bg);padding:80px 0 90px}.text-link{font-size:14px;font-weight:700;border-bottom:1px solid #b69d70;padding-bottom:5px;white-space:nowrap}.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}.case-image{position:relative;aspect-ratio:1.35;overflow:hidden;background:#dce0dc}.case-image img{width:100%;height:100%;object-fit:cover;transition:transform .4s}.case-card:hover img{transform:scale(1.035)}.case-image>span{position:absolute;bottom:14px;left:14px;background:#ffffffee;padding:4px 11px;font-size:12px}.case-card h3{font-size:18px;line-height:1.5;margin:18px 0 7px;display:flex;justify-content:space-between;gap:10px}.case-card h3 span{font-weight:400;color:var(--gold)}.case-card p{font-size:13px;color:var(--muted);margin:0}.method-intro{display:grid;grid-template-columns:1fr 1.35fr;gap:40px;align-items:center}.lead{font-size:16px;color:var(--muted);margin-top:25px;line-height:1.9}.features{list-style:none;margin:28px 0 0;padding:0}.features li{margin-bottom:18px;padding-left:20px;position:relative}.features li:before{content:'';position:absolute;left:0;top:12px;width:6px;height:6px;background:var(--gold)}.features b{display:block;font-size:16px}.features span{font-size:14px;color:var(--muted)}figure{margin:0}figure img{width:100%;display:block}figcaption{font-size:12px;color:#778184;text-align:center;margin-top:15px}.process-heading{margin:65px 0 22px;display:flex;justify-content:space-between;align-items:baseline;gap:20px}.process-heading h3{font-size:23px;margin:0}.process-heading p{font-size:14px;color:var(--muted)}.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.process-grid details{border:1px solid var(--line);padding:20px 17px;align-self:start}.process-grid summary{cursor:pointer;font-size:15px;font-weight:600}.process-grid summary span{color:var(--gold);font-size:13px;margin-right:8px}.process-grid p{font-size:14px;color:var(--muted);margin:15px 0 0}.about{background:#f0f2ef;padding:70px 0}.about-inner{display:grid;grid-template-columns:1fr 1fr;gap:100px}.about p:not(.eyebrow){margin:0 0 20px;font-size:16px;color:#5c696d}.faq{display:grid;grid-template-columns:1fr 1.3fr;gap:80px}.faq-list details{border-bottom:1px solid var(--line);padding:23px 0}.faq-list details:first-child{border-top:1px solid var(--line)}.faq-list summary{font-size:17px;font-weight:600;cursor:pointer;padding-right:20px}.faq-list p{font-size:15px;color:var(--muted);margin:17px 0 0}.contact{background:#202c30;color:#fff;padding:75px 0}.contact-inner{display:grid;grid-template-columns:1fr 1fr;gap:100px;align-items:center}.contact .eyebrow{color:#d0b276}.contact h2{font-size:39px}.contact p:not(.eyebrow){color:#bbc4c6;font-size:15px;line-height:1.9}.phone{display:inline-block;font-size:34px;letter-spacing:1px;font-weight:650;margin-top:12px}.phone span{color:#cfa859;font-size:26px;margin-left:14px}.contact-option{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #526064;padding:23px 0;gap:15px}.contact-option:first-child{border-top:1px solid #526064}.contact-option b{font-size:20px;display:block}.contact-option small{font-size:14px;color:#b6c0c1;display:block;margin-top:5px}.contact-option>span:last-child{font-size:25px;color:#d2b675}.contact-note{font-size:12px!important;margin-top:22px}footer{padding-top:42px;padding-bottom:25px}.footer-top,.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px}.socials{display:flex;gap:25px;font-size:14px}footer p{font-size:13px;color:var(--muted);margin:25px 0}footer p span{margin-left:16px}.footer-bottom{border-top:1px solid var(--line);padding-top:18px;color:#7b8486;font-size:12px}.mobile-contact{display:none}
@media(min-width:1600px){header{padding-left:calc((100vw - 1260px)/2 + 40px);padding-right:calc((100vw - 1260px)/2 + 40px)}}
@media(max-width:1100px){header{padding:0 24px;gap:15px}.brand{font-size:23px}.brand span{display:none}nav{gap:17px;font-size:13px}.wrap{padding-left:28px;padding-right:28px}.service-name{font-size:18px}.about-inner,.contact-inner,.faq{gap:45px}.process-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){html{scroll-padding-top:72px}body{padding-bottom:60px}.preview-note{font-size:12px;padding:6px 15px}.preview-note span{display:none}header{height:70px;padding:0 22px}.brand{font-size:24px}.menu-toggle{display:flex;flex-direction:column;gap:7px;padding:12px 0 12px 12px;border:0;background:none;width:36px;cursor:pointer}.menu-toggle span{height:2px;background:var(--ink);width:24px}nav{display:none;position:absolute;top:70px;left:0;right:0;background:white;padding:24px;box-shadow:0 10px 15px #00000012;flex-direction:column;align-items:stretch;gap:0;font-size:16px}nav.open{display:flex}nav>a{padding:13px 0}nav .button{margin-top:15px}.wrap{padding-left:22px;padding-right:22px}.hero{min-height:570px}.hero-image{object-position:57% center}.hero-shade{background:linear-gradient(90deg,#102228db,#14242968)}.hero-content{padding-top:66px;padding-bottom:110px}.hero .eyebrow{font-size:10px;letter-spacing:1.3px}h1{font-size:39px;letter-spacing:-1.7px}.hero-sub{font-size:14px;max-width:300px;line-height:1.9}.button{padding:12px 20px;min-height:50px;font-size:14px;gap:12px}.actions{gap:9px}.hero-bottom{font-size:12px;display:block;padding-top:17px;padding-bottom:17px}.hero-bottom>a{display:none}.services,.method,.faq{padding-top:60px;padding-bottom:60px}.section-top{display:block;margin-bottom:28px}.section-top>p{margin-top:17px}.section-top>.text-link{display:inline-block;margin-top:20px}h2{font-size:29px;letter-spacing:-1px}.service-grid{grid-template-columns:repeat(2,1fr)}.service{padding:23px 13px!important}.service:nth-child(1),.service:nth-child(2){border-bottom:1px solid var(--line)}.service:nth-child(2){border-right:0}.service:nth-child(odd){padding-left:0!important}.service-name{font-size:19px}.service-desc{font-size:13px}.number{margin-bottom:15px}.cases-section{padding:55px 0}.cases-grid{grid-template-columns:1fr;gap:32px}.case-image{aspect-ratio:1.55}.case-card h3{font-size:19px}.method-intro{grid-template-columns:1fr;gap:30px}.method-intro figure{margin:0 -10px}.method-intro h2 br{display:none}.process-heading{display:block;margin-top:40px}.process-heading h3{font-size:21px}.process-grid{gap:9px}.process-grid details{padding:16px 12px}.process-grid summary{font-size:14px}.process-grid summary span{display:block;margin-bottom:6px}.about{padding:50px 0}.about-inner,.faq,.contact-inner{grid-template-columns:1fr;gap:30px}.faq h2 br{display:none}.faq-list summary{font-size:16px}.contact{padding:55px 0}.contact h2{font-size:32px}.phone{font-size:31px}.contact-options{margin-top:0}.contact-option b{font-size:19px}.contact-note{line-height:1.8}.footer-top,.footer-bottom{align-items:flex-start;flex-direction:column}.socials{font-size:13px}footer p span{display:block;margin-left:0}footer{padding-bottom:30px}.mobile-contact{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));position:fixed;bottom:0;left:0;right:0;z-index:30;box-shadow:0 -3px 12px #00000015;padding-bottom:env(safe-area-inset-bottom);background:#202c30}.mobile-contact a{padding:17px 8px;text-align:center;font-size:15px;font-weight:600;color:#fff}.mobile-contact a:first-child{background:var(--gold)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}


.process-grid details[open]{grid-column:1/-1}.process-grid .process-detail{padding-top:8px}.process-grid .process-detail>p{font-size:16px;line-height:1.8;margin:12px 0 24px;max-width:850px}.process-grid .photos{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.process-grid .photos-1{grid-template-columns:1fr}.process-grid .photos img{display:block;width:100%;height:auto;max-height:650px;object-fit:contain;background:#f4f5f3}.process-grid .photos figure{min-width:0;overflow:hidden}.process-grid .photos-3 figure:first-child{grid-column:1/-1}@media(max-width:760px){.process-grid .photos{grid-template-columns:1fr;gap:12px}.process-grid .process-detail>p{font-size:16px}.process-grid details[open]{padding:20px 16px}}

/* Service detail pages */
.service-summary{display:flex;flex-direction:column;position:relative}.service-link:hover{background:#f4f5f3}.service-link:focus-visible{outline-offset:-3px}.service-page-top{padding-top:48px;padding-bottom:0}.back-link{display:inline-block;font-size:14px;color:var(--muted);margin-bottom:36px}.service-page-top h1{color:var(--ink);margin-bottom:20px}.service-page-top .lead{max-width:750px}.service-page-tabs{display:flex;border-bottom:1px solid var(--line);gap:34px;margin-top:35px}.service-page-tabs a{padding:15px 4px;border-bottom:3px solid var(--gold);font-size:18px;font-weight:700}.detail-section-title{margin-bottom:38px}.method-list{list-style:none;padding:0;margin:35px 0 0}.method-list li{display:flex;gap:25px;padding:27px 0;border-top:1px solid var(--line)}.method-list li>span{color:var(--gold);font-weight:700}.method-list h3{margin:0 0 10px;font-size:21px}.method-list p{margin:0;color:var(--muted);font-size:16px;max-width:800px}.case-context,.case-directory p{font-size:16px;color:var(--muted);margin:0 0 25px}.service-page-end{padding-top:60px;padding-bottom:70px}.sibling-services{display:flex;flex-wrap:wrap;gap:12px;margin:25px 0 35px}.sibling-services a{border:1px solid var(--line);padding:12px 18px;font-size:16px}.sibling-services a[aria-current]{border-color:var(--gold);color:var(--gold)}@media(max-width:760px){.service-page-top{padding-top:28px}.service-page-top h1{font-size:34px}.service-page-tabs{gap:28px}.method-list li{gap:18px}.sibling-services{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.sibling-services a{padding:12px;font-size:14px}}

.youtube-frame{position:relative;aspect-ratio:16/9;width:100%;background:#111;overflow:hidden}.youtube-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.video-caption{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:18px}.video-caption p{font-size:16px;color:var(--muted);margin:0}@media(max-width:760px){.video-caption{align-items:flex-start;flex-direction:column;gap:12px}.video-caption p{font-size:14px}}

/* Steel method: diagram followed by numbered construction steps */
.steel-cutaway-first{max-width:1000px;margin:0 auto 35px}.steel-cutaway-first img{width:100%;height:auto}.steel-cutaway-first figcaption{font-size:14px;line-height:1.7}.steel-step-content{flex:1;min-width:0}.steel-method-list .photos{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:24px}.steel-method-list .photos-1{grid-template-columns:1fr}.steel-method-list .photos-3 figure:first-child{grid-column:1/-1}.steel-method-list .photos figure{min-width:0}.steel-method-list .photos img{width:100%;height:auto;max-height:620px;object-fit:contain;background:#f4f5f3}.steel-method-list li{padding:30px 0}.steel-method-list li:last-child{border-bottom:1px solid var(--line)}@media(max-width:760px){.steel-method-list .photos{grid-template-columns:1fr;gap:12px}.steel-cutaway-first{margin-bottom:25px}.steel-cutaway-first figcaption{font-size:13px}.steel-method-list li{gap:18px}}

/* Group multiple photographs into a compact block for each construction step. */
.steel-method-list .photos.photo-blocks{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding:10px;background:var(--bg);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.steel-method-list .photos.photo-blocks figure{grid-column:auto;aspect-ratio:4/3;overflow:hidden;background:#fff}
.steel-method-list .photos.photo-blocks img{display:block;width:100%;height:100%;max-height:none;object-fit:contain;background:#fff}
@media(max-width:760px){.steel-method-list .photos.photo-blocks{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;padding:6px;border-radius:6px}}

.mobile-contact a{min-height:56px;display:flex;align-items:center;justify-content:center;white-space:nowrap;font-size:clamp(14px,3.6vw,15px)}
.mobile-contact a:nth-child(3){background:#34555b}