/* Base */
:root{
  --ink:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --surface:#ffffff;
  --brand:#0ea5e9;
  --brand2:#34d399;
}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Apple SD Gothic Neo,Noto Sans KR,sans-serif;color:var(--ink);background:#f8fafc}

/* Layout helpers */
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.85);backdrop-filter:saturate(130%) blur(10px);border-bottom:1px solid rgba(226,232,240,.7)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand img{height:36px;width:auto;display:block}
.brand-title{font-weight:800;letter-spacing:-.02em}
.header-cta{display:flex;gap:10px}
.btn{padding:9px 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface);text-decoration:none;color:var(--ink);font-weight:600;font-size:14px}
.btn.primary{border:none;background:linear-gradient(90deg,var(--brand),var(--brand2));color:#fff}

/* Hero */
.hero{position:relative;padding:96px 0 72px;background:
  radial-gradient(1200px 300px at 20% -10%, rgba(14,165,233,.18), transparent 60%),
  radial-gradient(900px 260px at 100% 0%, rgba(52,211,153,.18), transparent 60%)}
.hero h1{font-size:clamp(28px,5vw,44px);margin:0 0 12px;font-weight:900;letter-spacing:-.02em}
.hero p{margin:0;color:#334155}
.badge{display:inline-block;padding:4px 10px;background:#e2e8f0;border-radius:999px;color:#475569;font-size:12px;margin-bottom:12px}

/* Sections */
section{padding:72px 0}
h2{font-size:clamp(22px,3.4vw,30px);margin:0 0 10px}
.muted{color:var(--muted)}
.grid{display:grid;gap:18px}
@media(min-width:720px){.grid.cols-2{grid-template-columns:1fr 1fr}.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
.card{border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:18px}
.tag{display:inline-block;padding:2px 10px;border-radius:999px;background:#e2e8f0;font-size:12px;margin-right:6px;color:#475569}

.timeline{position:relative}
.timeline:before{content:'';position:absolute;left:10px;top:6px;bottom:6px;width:2px;background:var(--line)}
.tl{position:relative;padding-left:36px;margin:18px 0}
.tl:before{content:'';position:absolute;left:4px;top:6px;width:12px;height:12px;background:var(--brand);border-radius:50%}

/* Footer */
.footer{padding:36px 0;border-top:1px solid var(--line);text-align:center;color:var(--muted)}

/* Back to top */
.top{position:fixed;right:16px;bottom:16px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:10px 12px;text-decoration:none;color:var(--ink)}