:root{--bg:#f5f7fb;--card:#fff;--text:#172033;--muted:#64748b;--line:#dbe2ea;--brand:#2563eb;--brand2:#0f766e;--soft:#eef4ff;--shadow:0 12px 35px rgba(15,23,42,.08)}
[data-theme="dark"]{--bg:#0b1020;--card:#121a2d;--text:#e8eef8;--muted:#9ba9be;--line:#26324b;--brand:#7aa2ff;--brand2:#5eead4;--soft:#101c34;--shadow:0 12px 35px rgba(0,0,0,.28)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Pretendard,"Noto Sans KR",Arial,sans-serif;line-height:1.6}a{color:inherit}.container{max-width:1220px;margin:auto;padding:0 24px}.top{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--card) 93%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.top-inner{height:68px;display:flex;align-items:center;gap:18px}.brand{font-weight:850;text-decoration:none;font-size:18px}.brand span{color:var(--brand)}.nav{display:flex;gap:4px;margin-left:auto}.nav a,.btn{border:1px solid transparent;padding:9px 12px;border-radius:10px;text-decoration:none;font-size:14px}.nav a:hover,.btn:hover{background:var(--soft)}.theme{border:1px solid var(--line);background:var(--card);color:var(--text);padding:8px 11px;border-radius:10px;cursor:pointer}.hero{padding:62px 0 40px}.hero-box{background:linear-gradient(135deg,#0f172a,#1d4ed8 58%,#0f766e);color:#fff;border-radius:28px;padding:48px;box-shadow:var(--shadow)}.hero h1{font-size:48px;line-height:1.08;margin:0 0 16px;letter-spacing:-.03em}.hero p{max-width:820px;color:#dbeafe;font-size:18px}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.hero-actions a{background:#fff;color:#0f172a;padding:11px 16px;border-radius:12px;text-decoration:none;font-weight:750}.hero-actions a.secondary{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.3)}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.metric{border:1px solid rgba(255,255,255,.22);border-radius:14px;padding:14px;background:rgba(255,255,255,.06)}.metric strong{display:block;font-size:22px}.section{padding:28px 0}.section-head{display:flex;justify-content:space-between;gap:16px;align-items:end;margin-bottom:16px}.section h2{font-size:29px;margin:0}.muted{color:var(--muted)}.searchbar{display:flex;gap:10px}.searchbar input{width:min(520px,70vw);border:1px solid var(--line);background:var(--card);color:var(--text);padding:12px 14px;border-radius:12px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:0 5px 18px rgba(15,23,42,.035)}.course-card{display:flex;flex-direction:column;min-height:280px}.course-icon{font-size:32px}.badge{display:inline-flex;align-items:center;width:max-content;padding:4px 8px;border-radius:999px;background:var(--soft);color:var(--brand);font-size:12px;font-weight:800}.course-card h3{font-size:21px;margin:10px 0 6px}.tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}.tag{border:1px solid var(--line);border-radius:999px;padding:4px 8px;font-size:11px;color:var(--muted)}.card-footer{margin-top:auto;padding-top:16px;display:flex;justify-content:space-between;align-items:center;gap:10px}.card-footer a{color:var(--brand);text-decoration:none;font-weight:800}.status-template{opacity:.72}.track{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px}.path{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:14px}.path span{background:var(--soft);border-radius:10px;padding:8px 10px;font-weight:700;font-size:13px}.path i{color:var(--muted)}.result{display:block;text-decoration:none;border-bottom:1px solid var(--line);padding:13px 3px}.result:last-child{border:0}.result small{color:var(--brand);font-weight:750}.result strong{display:block;margin-top:3px}.progress{height:8px;border-radius:999px;background:var(--line);overflow:hidden}.progress i{display:block;height:100%;background:var(--brand);width:0}.continue-box{display:none}.footer{border-top:1px solid var(--line);margin-top:35px;padding:30px 0 50px;color:var(--muted);font-size:13px}.empty{padding:28px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:16px}.chapter-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.chapter-link{border:1px solid var(--line);background:var(--card);padding:12px 14px;border-radius:12px;text-decoration:none}.chapter-link small{color:var(--brand);font-weight:800;display:block}.chapter-link:hover{border-color:var(--brand)}.course-hero{padding:40px 0 20px}.course-hero .card{padding:32px}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.actions a{background:var(--brand);color:#fff;padding:10px 14px;border-radius:10px;text-decoration:none;font-weight:750}.actions a.secondary{background:var(--card);color:var(--text);border:1px solid var(--line)}.callout{border-left:4px solid var(--brand);background:var(--soft);padding:14px 16px;border-radius:10px}.code{background:#0b1220;color:#e5edf7;border-radius:14px;padding:16px;overflow:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;white-space:pre}.toc-group{margin-bottom:18px}.toc-group h3{margin:0 0 8px;color:var(--brand)}
@media(max-width:900px){.grid{grid-template-columns:1fr 1fr}.metrics{grid-template-columns:1fr 1fr}.hero h1{font-size:38px}.chapter-list{grid-template-columns:1fr}.nav{display:none}}
@media(max-width:600px){.grid{grid-template-columns:1fr}.container{padding:0 16px}.hero{padding-top:28px}.hero-box{padding:30px 22px;border-radius:20px}.hero h1{font-size:32px}.metrics{grid-template-columns:1fr 1fr}.section-head{display:block}.searchbar input{width:100%;margin-top:10px}}