:root{--blue:#1756b7;--navy:#102746;--ink:#192b43;--muted:#697b90;--pale:#f2f7fd;--line:#e1eaf3}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Pretendard,'Noto Sans KR','Malgun Gothic',Arial,sans-serif;color:var(--ink);background:#fff}a{text-decoration:none;color:inherit}button,input,textarea,select{font:inherit}button{cursor:pointer}.wrap{max-width:1180px;margin:auto;padding:0 26px}.top{position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);z-index:20;border-bottom:1px solid var(--line)}.nav{height:82px;display:flex;align-items:center;justify-content:space-between;gap:30px}.logo{font-size:32px;font-weight:900;letter-spacing:-2px;color:var(--navy)}.logo span{color:var(--blue)}.links{display:flex;gap:34px;font-size:14px;font-weight:700}.links a:hover{color:var(--blue)}.nav-cta,.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:5px;background:var(--blue);color:white;font-weight:700;padding:14px 22px}.nav-cta{font-size:13px}.hero{background:linear-gradient(112deg,#f9fcff 0%,#eff6ff 62%,#e4f0ff 100%);overflow:hidden}.hero-inner{min-height:590px;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:35px}.eyebrow{font-size:13px;font-weight:800;letter-spacing:2px;color:var(--blue);text-transform:uppercase}.hero h1{font-size:clamp(38px,4.6vw,64px);letter-spacing:-3px;line-height:1.23;margin:20px 0}.hero h1 em{font-style:normal;color:var(--blue)}.hero p{font-size:17px;line-height:1.85;color:#61758b;max-width:510px}.hero-actions{display:flex;gap:12px;margin-top:34px}.btn.secondary{background:#fff;color:var(--navy);border:1px solid #d3e0ee}.visual{height:420px;position:relative;display:grid;place-items:center}.visual:before{content:'';position:absolute;width:360px;height:360px;border-radius:50%;background:#dcecff;right:15px;top:30px}.building{position:relative;width:82%;height:330px;background:linear-gradient(145deg,#d8e4f1,#a8bdd4);border:10px solid #fff;box-shadow:0 24px 55px #2b527a30;transform:perspective(900px) rotateY(-10deg);display:flex;align-items:center;justify-content:center}.building:before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(90deg,transparent 0 76px,#ffffff55 77px 81px),linear-gradient(0deg,#10274640,transparent 60%)}.sign{position:relative;background:#fff;padding:22px 48px;box-shadow:0 12px 22px #1e36543b;color:var(--navy);font-size:44px;font-weight:900;letter-spacing:3px}.sign span{color:var(--blue)}.float-label{position:absolute;bottom:14px;left:0;background:#fff;padding:15px 20px;box-shadow:0 12px 30px #1a457020;font-size:12px;font-weight:700;color:var(--blue)}section{padding:100px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:42px}.section-head h2{font-size:38px;letter-spacing:-1.6px;margin:12px 0 0}.section-head p{max-width:490px;color:var(--muted);line-height:1.8;margin:0}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.service{padding:32px;border:1px solid var(--line);border-radius:10px;min-height:225px;transition:.2s;background:white}.service:hover{transform:translateY(-5px);box-shadow:0 16px 40px #164e8914;border-color:#b6cfea}.service .num{color:var(--blue);font-size:13px;font-weight:800}.service h3{font-size:23px;margin:24px 0 12px}.service p{font-size:14px;color:var(--muted);line-height:1.8;margin:0}.light{background:var(--pale)}.about{display:grid;grid-template-columns:1fr 1fr;gap:75px;align-items:center}.about-art{min-height:380px;background:linear-gradient(135deg,#1b5fc3,#102b50);border-radius:9px;display:flex;flex-direction:column;justify-content:end;padding:45px;color:white;position:relative;overflow:hidden}.about-art:before{content:'A';position:absolute;font-size:410px;font-weight:900;color:#ffffff12;right:-15px;top:-120px}.about-art strong{font-size:58px;letter-spacing:-4px;position:relative}.about-art small{font-size:15px;position:relative}.about-copy h2{font-size:38px;line-height:1.4;letter-spacing:-1.6px}.about-copy p{color:var(--muted);line-height:2}.tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}.tags span{background:white;border:1px solid var(--line);padding:10px 14px;font-size:13px;border-radius:30px}.projects{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.project{border:1px solid var(--line);background:white;border-radius:8px;overflow:hidden}.project-image{height:220px;display:grid;place-items:center;position:relative;overflow:hidden}.project-image.one{background:linear-gradient(135deg,#d9e7f5,#b7cce3)}.project-image.two{background:linear-gradient(135deg,#e8eef5,#c8d9e8)}.project-image.three{background:linear-gradient(135deg,#c6d8eb,#8baac9)}.project-image:before{content:'';width:65%;height:58%;border:13px solid #fff;background:#23486f;box-shadow:8px 12px 20px #284a6b44;transform:skewY(-5deg)}.project-image.two:before{height:70%;width:48%;background:#f9fcff;border:8px solid #173e6d}.project-image.three:before{width:75%;height:45%;background:#fff;border:8px solid #2464b4}.project-image b{position:absolute;color:#fff;font-size:26px;letter-spacing:3px}.project-image.two b,.project-image.three b{color:var(--blue);font-size:20px}.project-caption{padding:22px}.project-caption h3{margin:0 0 8px;font-size:19px}.project-caption p{margin:0;color:var(--muted);font-size:13px}.note{font-size:12px;color:var(--muted);margin-top:18px}.contact{background:var(--navy);color:white}.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px}.contact h2{font-size:40px;letter-spacing:-1px}.contact p{color:#c3d0df;line-height:1.9}.contact form{display:grid;gap:12px}.contact input,.contact textarea,.contact select{width:100%;border:1px solid #48607d;background:#203957;color:white;border-radius:4px;padding:15px;outline:none}.contact input::placeholder,.contact textarea::placeholder{color:#a8b8ca}.contact textarea{min-height:110px;resize:vertical}.contact .btn{width:100%;background:#4387ea}.contact .disclaimer{font-size:12px;line-height:1.7}.footer{background:#091c33;color:#9eafc2;padding:32px 0;font-size:13px}.footer .wrap{display:flex;justify-content:space-between;gap:20px}.menu-toggle{display:none;background:none;border:0;font-size:25px;color:var(--navy)}@media(max-width:800px){.nav{height:68px}.links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:25px;box-shadow:0 14px 25px #1027461c}.links.open{display:flex}.menu-toggle{display:block}.nav-cta{display:none}.hero-inner{grid-template-columns:1fr;padding-top:75px;padding-bottom:45px;min-height:auto}.visual{height:300px}.visual:before{height:250px;width:250px}.building{height:240px}.sign{font-size:28px;padding:16px 28px}section{padding:70px 0}.section-head{display:block}.section-head h2,.about-copy h2{font-size:30px}.section-head p{margin-top:18px}.grid3,.projects{grid-template-columns:1fr 1fr}.about,.contact-grid{grid-template-columns:1fr;gap:35px}.about-art{min-height:260px}.footer .wrap{display:block}}@media(max-width:530px){.wrap{padding:0 19px}.hero h1{font-size:40px}.hero p{font-size:15px}.hero-actions{flex-wrap:wrap}.grid3,.projects{grid-template-columns:1fr}.service{min-height:0}.contact h2{font-size:32px}}

/* Multi-page extension */
.page-hero{padding:100px 0 68px;background:linear-gradient(125deg,#f1f7ff,#fff)}.page-hero h1{font-size:clamp(36px,5vw,62px);letter-spacing:-.055em;margin:12px 0}.page-hero p{color:#61758b;max-width:680px;line-height:1.9}.page-content{padding:75px 0 105px}.detail-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.detail-card{border:1px solid #e1eaf3;border-radius:16px;padding:32px;background:#fff}.detail-card h3{font-size:24px;margin:12px 0}.detail-card p{color:#697b90;line-height:1.85}.step-list{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.step{padding:25px;background:#f2f7fd;border-radius:12px}.step strong{display:block;color:#1756b7;margin-bottom:12px}.filterbar{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 28px}.filterbar button{border:1px solid #d5e3f2;background:#fff;border-radius:30px;padding:10px 19px;cursor:pointer;color:#25405f}.filterbar button.active{background:#1756b7;color:white}.portfolio-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.portfolio-tile{border:1px solid #e1eaf3;border-radius:14px;overflow:hidden}.portfolio-art{height:205px;background:linear-gradient(145deg,#dbeaff,#8db8ee);display:grid;place-items:center;font-size:25px;font-weight:800;letter-spacing:.08em;color:#1a4c8d}.portfolio-tile:nth-child(2n) .portfolio-art{background:linear-gradient(135deg,#edf3fb,#c8d9ed)}.portfolio-tile:nth-child(3n) .portfolio-art{background:linear-gradient(135deg,#dae9f4,#8caecb)}.portfolio-body{padding:19px}.portfolio-body h3{margin:0 0 8px}.portfolio-body p{color:#697b90;margin:0}.contact-form{display:grid;gap:13px;max-width:700px}.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:16px;border:1px solid #d6e3f0;border-radius:8px;font:inherit;background:#fff;color:#192b43}.contact-form textarea{min-height:150px}.info-note{padding:17px;background:#f2f7fd;border-left:3px solid #1756b7;color:#4d6784;line-height:1.7}.page-links{display:flex;gap:14px;flex-wrap:wrap;margin-top:25px}.page-links a{color:#1756b7;font-weight:700}.footer a{color:inherit}.nav .links a[aria-current=page]{color:#1756b7;font-weight:800}@media(max-width:750px){.detail-grid,.portfolio-grid{grid-template-columns:1fr}.step-list{grid-template-columns:repeat(2,1fr)}.page-hero{padding:75px 0 50px}}

.home-project-photo{width:100%;height:235px;object-fit:cover;display:block;background:#edf3fb}.featured-grid{row-gap:24px}.portfolio-tile{background:white}.portfolio-tile button{display:block;border:0;padding:0;width:100%;background:none;text-align:left;cursor:zoom-in}.portfolio-tile img{width:100%;height:225px;object-fit:cover;display:block;background:#edf3fb;transition:transform .2s}.portfolio-tile button:hover img{transform:scale(1.025)}.portfolio-tile .portfolio-body h3{font-size:17px}.portfolio-tile .portfolio-body p{font-size:12px}.photo-dialog{border:0;border-radius:12px;padding:18px;max-width:min(94vw,1150px);max-height:94vh;box-shadow:0 25px 100px #061b3870}.photo-dialog::backdrop{background:#071a30d9}.photo-dialog img{display:block;max-width:100%;max-height:76vh;object-fit:contain;margin:auto}.photo-dialog #closePhoto{position:absolute;right:16px;top:12px;border:0;background:#102746;color:white;padding:9px 14px;border-radius:5px;cursor:pointer}.photo-dialog p{text-align:center;color:#4b617b}.portfolio-tile[hidden]{display:none!important}@media(max-width:750px){.home-project-photo{height:230px}}

/* ARTU homepage photographic hero */
.hero-photo{background:linear-gradient(90deg,rgba(7,28,58,.94) 0%,rgba(8,34,71,.87) 32%,rgba(10,39,76,.43) 62%,rgba(7,27,54,.08) 100%),url('images/hero-artu.jpg') center center / cover no-repeat; color:#fff}
.hero-photo .hero-inner{display:flex;align-items:center;min-height:640px;padding-top:72px;padding-bottom:72px}
.hero-photo .hero-copy{max-width:720px}
.hero-photo .eyebrow{color:#c9e1ff}
.hero-photo h1{color:#fff;font-size:clamp(38px,4.6vw,62px);text-shadow:0 2px 14px #091b3460}
.hero-photo h1 em{color:#53caff}
.hero-photo p{color:#f0f6ff;font-size:18px;max-width:610px;text-shadow:0 1px 9px #091b3470}
.hero-photo .btn.secondary{background:rgba(7,25,52,.25);color:white;border:1px solid #ffffffb0;backdrop-filter:blur(4px)}
@media(max-width:800px){.hero-photo{background-position:58% center}.hero-photo .hero-inner{min-height:590px;padding-top:80px;padding-bottom:80px}.hero-photo h1{font-size:clamp(34px,7vw,48px)}.hero-photo p{font-size:16px}}
@media(max-width:530px){.hero-photo{background-image:linear-gradient(90deg,rgba(7,28,58,.94),rgba(8,34,71,.72)),url('images/hero-artu.jpg');background-position:57% center}.hero-photo .hero-inner{min-height:550px}.hero-photo h1{letter-spacing:-1.8px}.hero-photo .btn{padding:13px 15px;font-size:13px}}

/* Final approved ARTU night-signage homepage */
.hero-photo{background-image:linear-gradient(90deg,#0751b7 0%,#0a4fae 29%,rgba(9,65,143,.94) 43%,rgba(9,57,126,.53) 61%,rgba(9,46,103,.02) 85%),url('images/hero-artu-final.webp');background-size:cover,auto 100%;background-position:center,right center;background-repeat:no-repeat;background-color:#0751b7}
.hero-photo .hero-inner{min-height:700px}
.hero-photo .hero-copy{max-width:650px}
.hero-photo .eyebrow{color:#fff}
.hero-photo h1{font-size:clamp(38px,4.3vw,60px)}
.hero-photo h1 em{color:#19d6f5}
.hero-photo p{color:#fff}
@media(max-width:800px){.hero-photo{background-image:linear-gradient(90deg,rgba(5,42,104,.95),rgba(5,50,112,.85) 58%,rgba(5,50,112,.45)),url('images/hero-artu-final.webp');background-size:cover,auto 100%;background-position:center,center}.hero-photo .hero-inner{min-height:600px}}