:root{
  /* Light theme + trustful education palette */
  --bg: #ffffff;
  --bg-alt: #f8fafc; /* slate-50 */
  --text: #0f172a;   /* slate-900 */
  --muted: #475569;  /* slate-600 */
  --border: #e2e8f0; /* slate-200 */
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);

  /* Main brand color: reliable navy/blue */
  --pri: #1d4ed8;    /* blue-700 */
  --pri-2: #0ea5e9;  /* sky-500 (sub accent) */
  --pri-ink: #ffffff;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Noto Sans KR','Apple SD Gothic Neo',sans-serif;
  color:var(--text);
  background:var(--bg);
}

.container{max-width:1040px;margin:0 auto;padding:0 20px}
.row{display:flex;justify-content:space-between;align-items:center;gap:16px}

.header{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
  padding:12px 0;
}
.logo{height:44px;width:auto}

.hero{
  padding:92px 0 76px;
  background:
    radial-gradient(900px 500px at 20% 10%, rgba(29,78,216,.12), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(14,165,233,.10), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg-alt));
}

.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;
  border:1px solid rgba(29,78,216,.25);
  border-radius:999px;
  color:rgba(29,78,216,.95);
  background:rgba(29,78,216,.06);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
}

h1{font-size:48px;line-height:1.18;margin:16px 0;letter-spacing:-.02em}
.sub{color:var(--muted);max-width:720px;font-size:16px;line-height:1.7}
.cta{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 18px;
  border-radius:12px;
  background:var(--pri);
  color:var(--pri-ink);
  text-decoration:none;
  font-weight:800;
  box-shadow:0 12px 22px rgba(29,78,216,.18);
}
.btn:hover{filter:brightness(1.02)}
.btn:active{transform:translateY(1px)}

.btn.ghost{
  background:transparent;
  color:var(--text);
  border:1px solid var(--border);
  box-shadow:none;
}

.section{padding:66px 0}
.section.alt{background:var(--bg-alt);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}

h2{font-size:32px;margin:0 0 20px;letter-spacing:-.02em}
h3{margin:0 0 10px;font-size:18px}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{
  background:#fff;
  border:1px solid var(--border);
  border-radius:16px;
  padding:22px;
  box-shadow:var(--shadow);
}
.card p{margin:0;color:var(--muted);line-height:1.7}

.list{margin:0;padding-left:18px;color:var(--muted);line-height:1.8}
.list li{margin:10px 0}

.contact-box{
  background:#fff;
  border:1px solid var(--border);
  border-radius:16px;
  padding:20px;
  box-shadow:var(--shadow);
}
.contact-box p{margin:10px 0}

.footer{
  padding:28px 0;
  border-top:1px solid var(--border);
  color:#64748b;
  background:#fff;
}

@media (max-width:768px){
  h1{font-size:34px}
  .grid{grid-template-columns:1fr}
  .hero{padding:72px 0 56px}
}