:root{
  --navy:#0f2a4a;
  --navy-light:#1c3f66;
  --teal:#1c8c86;
  --teal-light:#e6f4f2;
  --terracotta:#d1653f;
  --terracotta-light:#fbe9e1;
  --ink:#1a2230;
  --muted:#5b6b7d;
  --border:#e3e8ee;
  --bg:#f6f8fa;
  --card:#ffffff;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-family:"Pretendard","Apple SD Gothic Neo","Segoe UI",system-ui,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
}
header{
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 100%);
  color:#fff;
  padding:48px 24px 56px;
  text-align:center;
}
header .eyebrow{
  display:inline-block;
  font-size:13px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:#cfe3e1;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  border-radius:999px;
  padding:6px 16px;
  margin-bottom:16px;
}
header h1{
  margin:0 0 12px;
  font-size:clamp(26px,4vw,36px);
  font-weight:800;
  letter-spacing:-0.01em;
}
header p{
  margin:0;
  color:#c7d3e0;
  font-size:15px;
  max-width:560px;
  margin-inline:auto;
}
header a.back{
  display:inline-block;
  margin-top:14px;
  color:#cfe3e1;
  font-size:13px;
  text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.35);
}
main{
  max-width:960px;
  margin:0 auto;
  padding:44px 24px 72px;
}
.section-desc{
  color:var(--muted);
  font-size:14px;
  margin:0 0 20px;
}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:16px;
}
.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:14px;
  padding:22px 20px;
  text-decoration:none;
  color:var(--ink);
  display:flex;
  gap:14px;
  align-items:flex-start;
  transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover{
  transform:translateY(-3px);
  box-shadow:0 12px 24px rgba(15,42,74,.10);
  border-color:var(--teal);
}
.badge{
  flex:0 0 auto;
  min-width:34px;
  height:34px;
  padding:0 8px;
  border-radius:10px;
  background:var(--teal-light);
  color:var(--teal);
  font-weight:800;
  font-size:12px;
  letter-spacing:.02em;
  display:flex;
  align-items:center;
  justify-content:center;
}
.card-title{
  font-size:15.5px;
  font-weight:700;
  margin:0 0 4px;
  color:var(--navy);
}
.card-desc{
  font-size:13px;
  color:var(--muted);
  margin:0;
}
.empty-note{
  border:1px dashed var(--border);
  border-radius:14px;
  padding:28px;
  text-align:center;
  color:var(--muted);
  font-size:14px;
}
footer{
  text-align:center;
  padding:28px 24px 52px;
  color:var(--muted);
  font-size:13px;
}
.course-tag{
  display:inline-block;
  font-size:12px;
  font-weight:700;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:#fff;
  background:var(--teal);
  padding:4px 12px;
  border-radius:6px;
  margin-bottom:12px;
}