:root{
  --navy:#002a5c; --navy2:#004085; --blue:#0d6efd; --sky:#e8f1fb;
  --ink:#1a2333; --gray:#5b6472; --line:#e4e8ee; --bg:#f7f9fc; --white:#fff;
  --radius:14px; --shadow:0 6px 24px rgba(0,42,92,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Pretendard','Noto Sans KR','Segoe UI',system-ui,sans-serif;color:var(--ink);background:var(--white);line-height:1.6}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* header */
.topbar{background:var(--navy);color:#cfe0f5;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:36px}
.topbar a{color:#fff}
header.site{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
header.site .container{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center}
.logo img{height:52px;width:auto}
nav.main{display:flex;gap:28px;font-weight:600;font-size:15px}
nav.main a{color:var(--ink);padding:6px 2px;border-bottom:2px solid transparent}
nav.main a:hover,nav.main a.active{color:var(--navy2);border-color:var(--navy2)}
.lang-switch{display:flex;gap:4px;border:1px solid var(--line);border-radius:20px;padding:3px}
.lang-switch button{border:0;background:none;padding:4px 10px;border-radius:16px;font-size:12px;font-weight:700;color:var(--gray);cursor:pointer}
.lang-switch button.on{background:var(--navy);color:#fff}
.hamburger{display:none;border:0;background:none;font-size:26px;color:var(--navy);cursor:pointer}

/* hero */
.hero{position:relative;min-height:560px;display:flex;align-items:center;background:url('../img/hero.jpg') center/cover no-repeat}
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(100deg,rgba(0,20,45,.82) 25%,rgba(0,42,92,.45) 60%,rgba(0,42,92,.15))}
.hero .container{position:relative;color:#fff;padding:80px 20px}
.hero h1{font-size:44px;line-height:1.25;max-width:640px;margin-bottom:18px}
.hero p{font-size:18px;max-width:560px;color:#dbe7f5;margin-bottom:32px}
.btn{display:inline-block;padding:14px 30px;border-radius:8px;font-weight:700;font-size:15px;transition:.2s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:#0b5ed7}
.btn-ghost{border:2px solid rgba(255,255,255,.7);color:#fff;margin-left:10px}
.btn-ghost:hover{background:rgba(255,255,255,.15)}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy2)}

/* feature strip */
.feat-strip{background:var(--navy);color:#fff}
.feat-strip .container{display:grid;grid-template-columns:repeat(3,1fr)}
.feat-strip .box{padding:34px 38px;display:flex;gap:16px;align-items:flex-start}
.feat-strip .box:nth-child(2){background:var(--navy2)}
.feat-strip .ico{font-size:30px;line-height:1}
.feat-strip h3{font-size:18px;margin-bottom:4px}
.feat-strip p{font-size:13.5px;color:#c9d9ee}

/* sections */
section.sec{padding:80px 0}
section.sec.alt{background:var(--bg)}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head .tag{display:inline-block;font-size:12px;font-weight:800;letter-spacing:3px;color:var(--blue);text-transform:uppercase;margin-bottom:10px}
.sec-head h2{font-size:32px;color:var(--navy)}
.sec-head p{color:var(--gray);margin-top:10px}

/* category grid */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;cursor:pointer}
.cat-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.cat-card .thumb{height:150px;background:var(--sky);display:flex;align-items:center;justify-content:center;overflow:hidden}
.cat-card .thumb img{width:100%;height:100%;object-fit:cover}
.cat-card .body{padding:16px 18px}
.cat-card h3{font-size:15.5px;color:var(--navy);margin-bottom:4px}
.cat-card span{font-size:12.5px;color:var(--gray)}

/* AHU highlight */
.ahu{display:grid;grid-template-columns:1.05fr 1fr;gap:52px;align-items:center}
.ahu .visual{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.ahu .tag{font-size:12px;font-weight:800;letter-spacing:3px;color:var(--blue)}
.ahu h2{font-size:30px;color:var(--navy);margin:10px 0 14px}
.ahu>div>p{color:var(--gray);margin-bottom:26px}
.ahu-feats{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:30px}
.ahu-feats .f{background:var(--bg);border-radius:10px;padding:16px}
.ahu-feats h4{font-size:14.5px;color:var(--navy);margin-bottom:4px}
.ahu-feats p{font-size:13px;color:var(--gray)}

/* products */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:20px}
.chip{border:1px solid var(--line);background:#fff;border-radius:20px;padding:8px 18px;font-size:13.5px;font-weight:600;color:var(--gray);cursor:pointer;transition:.2s}
.chip.on,.chip:hover{background:var(--navy);border-color:var(--navy);color:#fff}
.search-wrap{max-width:420px;margin:0 auto 36px}
.search-wrap input{width:100%;padding:12px 18px;border:1px solid var(--line);border-radius:24px;font-size:14px;outline:none}
.search-wrap input:focus{border-color:var(--navy2)}
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:.25s}
.prod-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.prod-card .thumb{height:200px;background:#fff;display:flex;align-items:center;justify-content:center;overflow:hidden;border-bottom:1px solid var(--line)}
.prod-card .thumb img{width:100%;height:100%;object-fit:contain;padding:12px}
.prod-card .body{padding:14px 16px 18px}
.prod-card .cat{font-size:11.5px;font-weight:700;color:var(--blue);letter-spacing:.5px;text-transform:uppercase}
.prod-card h3{font-size:14.5px;color:var(--ink);margin-top:4px;line-height:1.4}
.count-note{text-align:center;color:var(--gray);font-size:13.5px;margin:26px 0 0}

/* modal */
.modal{position:fixed;inset:0;background:rgba(10,20,35,.75);display:none;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal.open{display:flex}
.modal .box{background:#fff;border-radius:var(--radius);max-width:640px;width:100%;overflow:hidden}
.modal img{width:100%;max-height:60vh;object-fit:contain;background:#fff;padding:16px}
.modal .cap{padding:18px 22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}
.modal .cap h3{font-size:16px;color:var(--navy)}
.modal .cap button{border:0;background:var(--bg);border-radius:8px;padding:8px 14px;cursor:pointer;font-weight:700;color:var(--gray)}

/* about */
.page-hero{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;padding:70px 0;text-align:center}
.page-hero h1{font-size:36px}
.page-hero p{color:#c9d9ee;margin-top:8px}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
.about-grid h2{font-size:28px;color:var(--navy);margin-bottom:16px}
.about-grid p{color:var(--gray);margin-bottom:12px}
.about-grid .visual{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.biz-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.biz-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px}
.biz-card .num{font-size:13px;font-weight:800;color:var(--blue)}
.biz-card h3{font-size:16.5px;color:var(--navy);margin:8px 0 6px}
.biz-card p{font-size:13.5px;color:var(--gray)}
.feat8{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feat8 .f{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px}
.feat8 h4{font-size:15px;color:var(--navy);margin-bottom:6px}
.feat8 p{font-size:13px;color:var(--gray)}
.spec-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table.spec{width:100%;border-collapse:collapse;font-size:13.5px;min-width:760px}
table.spec th,table.spec td{padding:11px 14px;text-align:center;border-bottom:1px solid var(--line)}
table.spec thead th{background:var(--navy);color:#fff;font-weight:700}
table.spec tbody th{background:var(--bg);font-weight:700;color:var(--navy);text-align:left;white-space:nowrap}

/* contact */
.ct-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:40px}
.ct-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;text-align:center}
.ct-card .ico{font-size:30px;margin-bottom:10px}
.ct-card h3{font-size:16px;color:var(--navy);margin-bottom:6px}
.ct-card p{font-size:14px;color:var(--gray)}
.ct-card a{color:var(--navy2);font-weight:700}
.map-wrap{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.map-wrap iframe{width:100%;height:440px;border:0;display:block}

/* CTA */
.cta{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;text-align:center;padding:70px 0}
.cta h2{font-size:30px;margin-bottom:10px}
.cta p{color:#c9d9ee;margin-bottom:28px}

/* footer */
footer.site{background:#0c1626;color:#9fb0c7;font-size:14px}
footer.site .cols{display:grid;grid-template-columns:2fr 1fr 1.4fr;gap:40px;padding:56px 0 40px}
footer.site h4{color:#fff;font-size:15px;margin-bottom:14px}
footer.site .flogo{margin-bottom:14px}
footer.site .flogo img{height:48px;width:auto}
footer.site a:hover{color:#fff}
footer.site ul{list-style:none}
footer.site li{margin-bottom:8px}
.copy{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;text-align:center;font-size:12.5px;color:#6d7f96}

@media(max-width:960px){
  .cat-grid,.prod-grid,.feat8,.biz-grid{grid-template-columns:repeat(2,1fr)}
  .ahu,.about-grid{grid-template-columns:1fr}
  .ct-grid{grid-template-columns:1fr}
  .feat-strip .container{grid-template-columns:1fr}
  footer.site .cols{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  nav.main{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:10px 20px;border-bottom:1px solid var(--line)}
  nav.main.open{display:flex}
  nav.main a{padding:12px 0;border-bottom:1px solid var(--line)}
  .hamburger{display:block}
}
@media(max-width:560px){
  .cat-grid,.prod-grid{grid-template-columns:1fr}
  .hero{min-height:460px}
  .hero h1{font-size:26px}
  .btn-ghost{margin-left:0;margin-top:10px}
}