:root {
  --primary:#0D2B5A;
  --accent:#2F6FED;
  --text:#111;
  --muted:#666;
  --bg:#ffffff;
  --bg-alt:#F6F8FC;
  --radius:16px;
}
*,*::before,*::after { box-sizing:border-box; }
html,body { margin:0; padding:0; font-family: system-ui, -apple-system, Segoe UI, Roboto, 'Noto Sans KR', sans-serif; color:var(--text); background:var(--bg); }
img { max-width:100%; height:auto; vertical-align:middle; }
a { color:var(--accent); text-decoration:none; }
.container { width: min(1120px, 92%); margin: 0 auto; }
.muted { color:var(--muted); }
.small { font-size:.9rem; }

.site-header { position:sticky; top:0; z-index:100; background:#fff; border-bottom:1px solid #eee; }
.header-inner { display:flex; align-items:center; justify-content:space-between; padding:14px 0; gap:16px; }
.brand { display:flex; align-items:center; gap:10px; font-weight:700; color:#111; }
.nav ul { list-style:none; display:flex; gap:20px; margin:0; padding:0; }
.nav a { padding:12px 10px; border-radius:10px; line-height:1; }
.nav a:hover { background:#f1f3f7; }
.nav-toggle { display:none; font-size:22px; background:none; border:0; }

.hero { background: linear-gradient(180deg, #0d2b5a 0%, #163a77 100%); color:#fff; padding:80px 0; }
.hero h1 { font-size: clamp(28px, 5vw, 48px); margin:0 0 10px; }
.lead { font-size: clamp(16px, 2.4vw, 20px); color:#e7ecf7; }
.cta-row { display:flex; gap:12px; margin-top:18px; }

.btn { display:inline-block; padding:12px 18px; border-radius:12px; border:1px solid transparent; font-weight:600; min-height:44px; }
.btn.primary { background:var(--accent); color:#fff; }
.btn.ghost { border-color:#ffffff55; color:#fff; }
.btn.link { padding:8px 0; }

.intro, .logos, .cta { padding:64px 0; }
.feature-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap:16px; margin-top:20px; }
.feature-grid article { background:var(--bg-alt); padding:16px; border-radius:var(--radius); }

.logo-wall { display:grid; grid-template-columns: repeat(5, 1fr); gap:14px; list-style:none; padding:0; margin:20px 0 0; }
.logo-wall li { background:#fff; border:1px solid #eee; border-radius:12px; padding:16px; text-align:center; }

.cta-inner { background:#0d2b5a; color:#fff; border-radius:24px; padding:36px; display:grid; place-items:center; text-align:center; }

.page-hero { background:var(--bg-alt); padding:56px 0; border-bottom:1px solid #eee; }
.two-col { display:grid; grid-template-columns:2fr 1fr; gap:28px; padding:40px 0; }

.timeline { list-style:none; padding:0; margin:0; }
.timeline li { background:#fff; border:1px solid #eee; border-radius:12px; padding:12px 14px; margin-bottom:10px; }
.timeline span { font-weight:700; margin-right:8px; color:var(--primary); }

.cards { display:grid; grid-template-columns: repeat(4, 1fr); gap:16px; padding:40px 0; }
.card { border:1px solid #eee; border-radius:16px; padding:18px; background:#fff; display:flex; flex-direction:column; gap:8px; }

.portfolio-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap:16px; padding:40px 0; }
.portfolio-grid article { border:1px solid #eee; border-radius:16px; padding:18px; background:#fff; }

.contact-form { display:grid; gap:14px; padding:40px 0; }
.form-row { display:grid; gap:8px; }
.grid-2 { display:grid; grid-template-columns: repeat(2, 1fr); gap:14px; }
input, select, textarea { padding:12px; border:1px solid #ddd; border-radius:12px; background:#fff; min-height:44px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

.address-grid { display:grid; grid-template-columns: 1fr 1fr; gap:16px; padding:20px 0 40px; }
.address-card { border:1px solid #eee; border-radius:16px; padding:16px; background:#fff; }

.site-footer { margin-top:40px; border-top:1px solid #eee; padding:32px 0 60px; background:#fff; position:relative; }
.footer-grid { display:grid; grid-template-columns:1.5fr 1fr 1fr; gap:16px; }
.footer-brand { display:flex; align-items:center; gap:10px; font-weight:700; margin-bottom:8px; }
.link-list { list-style:none; padding:0; margin:0; display:grid; gap:6px; }
.back-to-top { position:absolute; right:20px; bottom:20px; border:1px solid #ddd; background:#fff; padding:10px 12px; border-radius:12px; cursor:pointer; }

@media (max-width: 992px) {
  .feature-grid { grid-template-columns:1fr 1fr; }
  .cards { grid-template-columns:1fr 1fr; }
  .portfolio-grid { grid-template-columns:1fr 1fr; }
  .two-col { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr 1fr; }
}
@media (max-width: 640px) {
  .nav ul { position:absolute; top:60px; right:4%; left:4%; background:#fff; border:1px solid #eee; border-radius:12px; padding:12px; display:none; flex-direction:column; gap:6px; }
  .nav.open ul { display:flex; }
  .nav-toggle { display:block; }
  .feature-grid { grid-template-columns:1fr; }
  .cards { grid-template-columns:1fr; }
  .portfolio-grid { grid-template-columns:1fr; }
  .logo-wall { grid-template-columns:1fr 1fr; }
  .grid-2 { grid-template-columns:1fr; }
  .site-header .header-inner { padding: 12px 0; }
  .hero { padding: 64px 0; }
  .cta-inner { padding: 28px; }
}