:root{--ink:#17181b;--muted:#6f7279;--line:#e7e8eb;--soft:#f6f7f8;--accent:#5b4de4}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:#fff;color:var(--ink);font-family:Pretendard,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.page-inner,.header-inner{width:min(1120px,calc(100% - 48px));margin:0 auto}

.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid var(--line);background:rgba(255,255,255,.97);backdrop-filter:blur(12px)}.header-inner{height:72px;display:grid;grid-template-columns:190px minmax(260px,480px) 1fr;align-items:center;gap:30px}.logo,.footer-logo{color:var(--ink);font-size:16px;font-weight:850;letter-spacing:1.2px;text-decoration:none}.learn-search{height:42px;padding:0 15px;display:flex;align-items:center;gap:10px;border:1px solid #dddfe3;background:#f7f7f8}.learn-search:focus-within{border-color:#85808f;background:#fff}.learn-search svg{width:18px;fill:none;stroke:#777a81;stroke-width:1.8}.learn-search input{width:100%;border:0;outline:0;background:transparent;color:var(--ink);font:inherit;font-size:13px}.learn-search input::placeholder{color:#999ba1}.utility-nav{justify-self:end;display:flex;gap:26px}.utility-nav a{padding:25px 0;color:#85878e;font-size:13px;font-weight:650;text-decoration:none}.utility-nav a.active,.utility-nav a:hover{color:var(--ink)}

.learn-intro{padding:54px 0 46px;border-bottom:1px solid #2b313c;background:radial-gradient(circle at 80% 20%,rgba(110,231,183,.12),transparent 28%),radial-gradient(circle at 20% 10%,rgba(147,197,253,.1),transparent 24%),#0f1115;color:#f3f4f6}.intro-label{display:block;margin-bottom:9px;color:#6ee7b7;font-size:10px;font-weight:800;letter-spacing:1.4px}.learn-intro h1{color:#6ee7b7;font-size:38px;line-height:1.15;letter-spacing:-1.4px}.learn-intro p{margin-top:14px;color:#a8b0bd;font-size:15px;line-height:1.7;letter-spacing:-.25px;white-space:pre-line}

.category-navigation{position:relative;z-index:20;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}.category-row{min-height:56px;display:flex;align-items:stretch;gap:28px;overflow:visible}.all-category,.root-category-link{position:relative;display:flex;align-items:center;color:#62656c;font-size:14px;font-weight:650;text-decoration:none;white-space:nowrap}.all-category::after,.category-group::after{content:"";position:absolute;right:0;bottom:-1px;left:0;height:2px;background:transparent}.all-category.active,.all-category:hover,.category-group.active>.root-category-link,.root-category-link:hover{color:var(--ink)}.all-category.active::after,.category-group.active::after{background:var(--ink)}.category-group{position:relative;display:flex;align-items:center;gap:5px}.submenu-toggle{width:24px;height:32px;display:grid;place-items:center;border:0;background:transparent;color:#85878d;cursor:pointer}.submenu-toggle svg{width:10px;fill:none;stroke:currentColor;stroke-width:1.5;transition:transform .18s}.category-dropdown{position:absolute;top:calc(100% - 1px);left:-16px;width:210px;padding:8px;border:1px solid #dedfe3;background:#fff;box-shadow:0 12px 30px rgba(20,21,25,.12);opacity:0;visibility:hidden;transform:translateY(5px);transition:opacity .15s,transform .15s,visibility .15s}.category-group:hover .category-dropdown,.category-group:focus-within .category-dropdown,.category-group.open .category-dropdown{opacity:1;visibility:visible;transform:translateY(0)}.category-group.open .submenu-toggle svg{transform:rotate(180deg)}.category-dropdown a{min-height:38px;padding:0 11px;display:flex;align-items:center;color:#555860;font-size:13px;text-decoration:none}.category-dropdown a:hover,.category-dropdown a.active{background:var(--soft);color:var(--ink)}.category-dropdown .root-overview{min-height:50px;margin-bottom:5px;justify-content:space-between;border-bottom:1px solid var(--line)}.root-overview strong{font-size:13px}.root-overview span{color:#9a9ca2;font-size:10px}

@media(hover:hover){.all-category,.root-category-link,.submenu-toggle{transition:color .2s ease,font-weight .2s ease}.all-category:hover,.category-group:hover>.root-category-link{color:#000;font-weight:800}.category-group:hover>.submenu-toggle{color:#000}.all-category::after,.category-group::after{transition:background-color .2s ease}.all-category:hover::after,.category-group:hover::after{background:#000}.category-dropdown a{transition:background-color .18s ease,color .18s ease,padding-left .18s ease}.category-dropdown a:hover{padding-left:15px;background:#111216;color:#fff}.category-dropdown a:hover span{color:#d7d8dc}}

.learning-content{padding:46px 0 96px}.content-header{margin-bottom:25px;display:flex;align-items:flex-end;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:20px}.content-header h2{font-size:24px;line-height:1.3;letter-spacing:-.8px}.content-header p{margin-top:7px;color:var(--muted);font-size:13px}.result-count{color:#92949a;font-size:12px}.result-count b{margin-right:2px;color:var(--ink);font-size:14px}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px 22px}.article-card{min-width:0;color:inherit;text-decoration:none}.thumbnail{position:relative;aspect-ratio:16/10;overflow:hidden;display:flex;align-items:center;padding:24px;border:1px solid transparent;background:radial-gradient(circle at 82% 16%,rgba(91,77,228,.28),transparent 34%),#202126;color:#fff;transition:transform .2s,box-shadow .2s}.article-card:nth-child(3n+2) .thumbnail{background:radial-gradient(circle at 82% 16%,rgba(48,158,96,.25),transparent 34%),#202126}.article-card:nth-child(3n+3) .thumbnail{background:radial-gradient(circle at 82% 16%,rgba(42,120,215,.27),transparent 34%),#202126}.article-card:hover .thumbnail{transform:translateY(-2px);box-shadow:0 10px 24px rgba(20,21,28,.12)}.thumbnail.has-image{padding:0;background:#eee}.thumbnail img{width:100%;height:100%;object-fit:cover;transition:transform .24s}.article-card:hover .thumbnail img{transform:scale(1.018)}.thumbnail-fallback{position:relative;z-index:1}.has-image .thumbnail-fallback{display:none}.thumbnail-fallback span{display:block;margin-bottom:13px;color:rgba(255,255,255,.58);font-size:9px;font-weight:800;letter-spacing:1.1px}.thumbnail-fallback strong{display:block;max-width:95%;font-size:25px;line-height:1.08;letter-spacing:-1px}.thumbnail-fallback small{display:block;margin-top:10px;color:rgba(255,255,255,.42);font-size:9px;letter-spacing:.8px}.card-body{padding-top:15px}.card-category{display:block;color:var(--accent);font-size:10px;font-weight:800;letter-spacing:.55px;text-transform:uppercase}.card-body h3{margin-top:8px;font-size:18px;line-height:1.42;letter-spacing:-.55px}.card-body p{height:44px;margin-top:8px;overflow:hidden;color:#74777e;font-size:13px;line-height:1.65;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.card-body time{display:block;margin-top:13px;color:#a0a2a7;font-size:10px}.article-card[hidden]{display:none}.empty-state{padding:70px 0;text-align:center;color:#85878d}.empty-state strong{display:block;margin-bottom:9px;color:var(--ink);font-size:18px}.empty-state p{font-size:13px}

.site-footer{padding:42px 0;border-top:1px solid var(--line)}.site-footer .page-inner{display:grid;grid-template-columns:1fr auto;gap:7px}.site-footer p{color:#777a80;font-size:12px}.site-footer span{grid-column:2;grid-row:1/3;align-self:center;color:#a0a2a7;font-size:10px}

.learn-intro .learn-search{width:min(440px,100%);margin-top:22px;border-color:#2b313c;background:rgba(23,26,33,.9)}.learn-intro .learn-search:focus-within{border-color:#6ee7b7;background:#171a21;box-shadow:0 0 0 3px rgba(110,231,183,.08)}.learn-intro .learn-search svg{stroke:#a8b0bd}.learn-intro .learn-search input{color:#f3f4f6}.learn-intro .learn-search input::placeholder{color:#7f8793}

.global-header--adaptive+main .learn-intro{padding-top:122px}

@media(max-width:900px){.header-inner{grid-template-columns:170px minmax(220px,1fr) auto}.article-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.category-row{overflow-x:auto;overflow-y:hidden;scrollbar-width:none}.category-row::-webkit-scrollbar{display:none}.category-dropdown{position:fixed;top:auto;right:24px;left:24px;width:auto}.category-group:hover .category-dropdown{opacity:0;visibility:hidden;transform:translateY(5px)}.category-group.open .category-dropdown,.category-group:focus-within .category-dropdown{opacity:1;visibility:visible;transform:translateY(0)}}

@media(max-width:640px){.page-inner,.header-inner{width:calc(100% - 32px)}.header-inner{height:auto;padding:14px 0;grid-template-columns:1fr auto;gap:12px}.logo{font-size:14px}.learn-search{grid-column:1/-1;grid-row:2}.utility-nav{gap:18px}.utility-nav a{padding:3px 0}.learn-intro{padding:36px 0 30px}.learn-intro h1{font-size:31px}.learn-intro p{font-size:13px}.category-row{min-height:50px;gap:22px}.all-category,.root-category-link{font-size:13px}.category-dropdown{right:16px;left:16px}.learning-content{padding:34px 0 72px}.content-header{margin-bottom:20px;align-items:flex-start}.content-header h2{font-size:21px}.content-header p{max-width:250px;font-size:12px;line-height:1.5}.article-grid{grid-template-columns:1fr;gap:34px}.thumbnail{aspect-ratio:16/9}.card-body h3{font-size:17px}.site-footer .page-inner{display:block}.site-footer p{margin-top:8px}.site-footer span{display:block;margin-top:18px}}

@media(max-width:640px){.global-header--adaptive+main .learn-intro{padding-top:96px}}

.learn-intro h1,.learn-intro p,.learn-intro .learn-search{opacity:0;transform:translateY(18px);animation:learn-intro-rise .62s cubic-bezier(.22,1,.36,1) forwards}.learn-intro p{animation-delay:.1s}.learn-intro .learn-search{animation-delay:.2s}@keyframes learn-intro-rise{to{opacity:1;transform:translateY(0)}}@media(prefers-reduced-motion:reduce){.learn-intro h1,.learn-intro p,.learn-intro .learn-search{opacity:1;transform:none;animation:none}}