:root{--primary:#2563eb;--ink:#171719;--muted:#88888f}*{box-sizing:border-box}body{margin:0;color:var(--ink);font-family:Arial,'Apple SD Gothic Neo','Malgun Gothic',sans-serif;line-height:1.5}button,input,a{-webkit-tap-highlight-color:transparent}button,a{color:inherit}button{font:inherit;cursor:pointer;background:none;border:0}a{text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #60a5fa;outline-offset:4px}.wrap{max-width:1180px;margin:auto;padding:0 24px}header{background:#fff;color:var(--ink)}.top{height:76px;display:flex;align-items:center;justify-content:space-between}.logo{font-size:30px;font-weight:1000;font-style:normal;letter-spacing:-1.5px;color:var(--primary);position:relative}.logo span{font-size:10px;margin-left:5px;letter-spacing:0}.header-right{display:flex;gap:23px;align-items:center}#search{display:flex;align-items:center;gap:12px}#search input{border:0;background:#f5f5f8;border-radius:24px;color:var(--ink);padding:11px 20px;width:275px;font-size:14px}.search-icon{font-size:36px;line-height:1}.chat{font-size:28px}.login{background:var(--primary);color:#fff;border-radius:7px;padding:7px 17px;font-size:14px;font-weight:700}nav{border-bottom:1px solid #eee;position:relative;background:white;z-index:2}.nav-inner{height:74px;display:flex;align-items:center;justify-content:space-between}#menu{font-size:18px;font-weight:700;display:flex;align-items:center;gap:16px}#menu span{font-size:23px;font-weight:400}.nav-links{display:flex;align-items:center;gap:21px;font-size:14px}.nav-links i{height:14px;width:1px;background:#ddd}.menu-panel{padding:20px 24px;border-top:1px solid #eee}.menu-panel button{padding:9px 18px}.hero-section{padding-top:42px;padding-bottom:39px}.hero-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.hero-card{position:relative;height:325px;padding:28px 25px;border-radius:13px;overflow:hidden;display:flex;flex-direction:column;align-items:flex-start;text-align:left}.pink{background:#f7c9cd}.mint{background:#67e5e4}.dark{background:#183c41;color:white}.hero-card:after{content:'';position:absolute;width:260px;height:260px;border:1px solid currentColor;opacity:.12;border-radius:50%;right:-105px;top:30px;box-shadow:0 0 0 35px #ffffff18,0 0 0 70px #ffffff18}.hero-num{font-size:52px;font-weight:850;line-height:1;letter-spacing:-3px}.hero-num small{display:block;font-size:11px;font-weight:600;letter-spacing:2px;margin-top:7px}.hero-copy{margin-top:auto;z-index:1}.pill{font-size:11px;background:#1c1c20;color:white;border-radius:3px;padding:4px 7px;display:inline-block}.hero-card h1{font-size:24px;line-height:1.42;letter-spacing:-1px;margin:11px 0 15px}.hero-card p{font-size:13px;margin:0;opacity:.7}.hero-arrow{position:absolute;bottom:25px;right:24px;font-size:24px}.slide-controls{display:flex;align-items:center;gap:12px;margin-top:21px}.track{height:3px;background:#ededee;flex:1;margin-right:10px}.track span{display:block;height:100%;width:50%;background:#222;transition:transform .3s}.page-count{font-size:12px;color:#999;margin-right:12px}.page-count b{color:#222}.slide-controls button{height:34px;width:34px;border:1px solid #e4e4e8;border-radius:50%;font-size:22px;line-height:1;color:#555}.categories{display:grid;grid-template-columns:repeat(10,1fr);gap:18px;margin-top:31px}.category{padding:0;text-align:center;font-size:13px;white-space:nowrap}.category .icon{width:58px;height:58px;margin:0 auto 10px;display:grid;place-items:center;background:#f5f5f8;border-radius:16px;font-size:27px;transition:.2s}.category:hover .icon,.category.selected .icon{background:#eaf2ff;transform:translateY(-3px)}.category.selected{color:var(--primary)}.divider{height:7px;background:#f6f6f8}.challenge{display:flex;align-items:center;gap:45px;padding-top:35px;padding-bottom:35px;border-bottom:1px solid #eee}.eyebrow{font-size:11px;letter-spacing:1.7px;color:#929299;font-weight:600}h2{font-size:23px;letter-spacing:-.8px;margin:6px 0 0}.challenge p{font-size:14px;color:#777;margin:6px 0 0}.challenge a{margin-left:auto;font-size:13px;font-weight:700;white-space:nowrap}.challenge a span{margin-left:15px}.challenge-stat{border-left:1px solid #eee;padding-left:30px;display:flex;flex-direction:column;gap:2px;white-space:nowrap}.challenge-stat strong{font-size:29px;color:var(--primary);letter-spacing:-1px}.challenge-stat strong span{font-size:14px;margin-left:4px}.challenge-stat>span{font-size:11px;color:#888}.best{padding-top:58px;padding-bottom:36px;scroll-margin-top:24px}.section-title{display:flex;justify-content:space-between;align-items:end;margin-bottom:24px}.section-title>button{font-size:13px;padding-bottom:3px}.live-dot{width:7px;height:7px;background:var(--primary);display:inline-block;vertical-align:middle;margin-left:3px;border-radius:50%}.tabs{display:flex;gap:7px;margin-bottom:20px}.tabs button{border:1px solid #e1e1e5;border-radius:20px;padding:6px 15px;font-size:13px}.tabs button.active{background:#202023;color:#fff;border-color:#202023}.cards{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.course{text-align:left;padding:0;display:block;width:100%}.art{height:210px;position:relative;overflow:hidden;padding:19px;display:flex;flex-direction:column;justify-content:end;border-radius:8px;margin-bottom:12px}.art:after{content:'';width:180px;height:180px;border:36px solid currentColor;border-radius:50%;position:absolute;right:-70px;top:-75px;opacity:.08}.rank{position:absolute;top:0;left:0;background:#17171bea;color:white;padding:6px 11px;border-radius:0 0 8px 0;font-size:13px}.original{position:absolute;right:12px;top:10px;font-size:10px;opacity:.55;letter-spacing:-.3px}.art .number{font-size:53px;font-weight:900;line-height:1;letter-spacing:-3px;margin-bottom:12px;opacity:.45}.art strong{font-size:20px;font-weight:800;line-height:1.3;letter-spacing:-.8px;z-index:1}.yellow{background:#ffde67}.violet{background:#d3c3e7}.blue{background:#bce9ef}.lime{background:#e5ef9a}.type{font-size:10px;padding:1px 5px;border:1px solid #777;border-radius:3px}.course h3{font-size:13px;font-weight:500;line-height:1.55;margin:7px 0 4px;min-height:40px;word-break:keep-all}.rating{font-size:12px;color:#666}.rating b{color:#3b82f6;font-size:15px}.rating span{color:#a0a0a5}.price{font-size:14px;font-weight:700;margin-top:5px}.price b{color:#2563eb;margin-right:5px}.price small{font-size:11px;font-weight:500}.sample-note{text-align:right;font-size:11px;color:#999;margin-top:20px}.preview{padding-top:25px;padding-bottom:55px}.muted{font-size:12px;color:#999}.preview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.preview-card{min-height:217px;border-radius:10px;padding:22px;text-align:left;position:relative;overflow:hidden}.small-label{font-size:10px;letter-spacing:1.5px;opacity:.6}.preview-card>strong{font-size:22px;display:block;line-height:1.4;margin-top:12px;letter-spacing:-.7px}.play{position:absolute;right:22px;top:88px;border:1px solid #ffffff70;border-radius:50%;width:40px;height:40px;display:grid;place-items:center;font-size:12px;padding-left:2px}.preview-bottom{font-size:11px;display:flex;justify-content:space-between;opacity:.7;margin-top:32px}.preview-bottom b{font-weight:400}.discover{padding-top:38px;padding-bottom:78px;border-top:1px solid #eee}.discover>p{font-size:14px;color:#888;margin:9px 0 26px}.discover-grid{display:grid;grid-template-columns:repeat(3,1fr);background:#f8f8fa;border-radius:10px;padding:13px 22px;column-gap:30px}.discover-grid button{display:flex;align-items:center;padding:16px 5px;text-align:left;font-size:14px;gap:12px}.discover-grid button span{margin-left:auto;color:#999}.discover-grid button:hover{color:var(--primary)}footer{background:#fafafa;border-top:1px solid #eee;padding:42px 0 28px;color:#828289}.footer-top{display:grid;grid-template-columns:1.8fr repeat(4,1fr);gap:25px;padding-bottom:32px}.footer-brand p{font-size:12px;margin-top:6px}.footer-top h3{font-size:12px;color:#49494f;margin:8px 0 16px}.footer-top button{display:block;font-size:12px;padding:0;margin-bottom:11px}.footer-bottom{display:flex;align-items:end;gap:30px;border-top:1px solid #e9e9ec;padding-top:24px;font-size:10px}.footer-bottom strong{font-size:11px;font-weight:500}.footer-bottom p{margin:5px 0}.footer-bottom>span{margin-left:auto}.social{font-size:22px}#backtop{position:fixed;bottom:25px;right:24px;border:1px solid #eee;background:white;box-shadow:0 3px 12px #00000009;width:43px;height:43px;border-radius:50%;font-size:24px;z-index:3}dialog{width:min(520px,90vw);border:0;border-radius:18px;padding:36px;box-shadow:0 20px 100px #0003}dialog::backdrop{background:#0007}.close{position:absolute;right:14px;top:10px;font-size:28px;color:#888}dialog h2{margin:12px 0 16px}dialog p{font-size:14px;color:#777;line-height:1.8}dialog .art{height:200px;margin-top:10px}#empty{padding:45px;text-align:center;color:#888}[hidden]{display:none!important}
/* Intrinsic sizes must not force a grid track wider than its neighbours. */
.wrap{width:100%;min-width:0}
.hero-grid,.cards,.preview-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.cards{grid-template-columns:repeat(5,minmax(0,1fr));align-items:stretch;gap:28px 16px}
.hero-card,.course,.preview-card,.section-title>div,.header-right,.footer-top>div{min-width:0}
h1,h2,h3,.preview-card>strong{word-break:keep-all;overflow-wrap:anywhere}
.logo{flex-shrink:0;white-space:nowrap;line-height:1.3}
.top{gap:24px;min-height:76px;height:auto;padding-top:14px;padding-bottom:14px}
.header-right{gap:16px}
#search{min-width:0}
#search input{width:clamp(180px,25vw,275px);min-width:0;max-width:100%;font-size:1rem}
#search button,.chat,.login,#menu,.slide-controls button{min-width:44px;min-height:44px;flex-shrink:0}
.login{white-space:nowrap}
.nav-inner{gap:24px;height:auto;min-height:74px;padding-top:12px;padding-bottom:12px}
.nav-links{flex-wrap:wrap;justify-content:flex-end;gap:10px 16px;font-size:.875rem}
.nav-links button{min-height:44px;padding:0}
.menu-panel{display:flex;flex-wrap:wrap;gap:4px}
.menu-panel button{min-height:44px}
.hero-card{height:auto;min-height:340px;gap:24px}
.hero-num{font-size:clamp(2rem,4vw,3.25rem);letter-spacing:-1.5px}
.hero-card h1{font-size:clamp(1.125rem,1.65vw,1.5rem);line-height:1.5}
.hero-card p{padding-right:30px;font-size:.875rem}
.pill{font-size:.75rem}
.categories{grid-template-columns:repeat(10,minmax(0,1fr));gap:12px}
.category{font-size:.875rem;min-height:90px}
.category .icon{margin-bottom:8px}
.eyebrow{font-size:.75rem;letter-spacing:1px}
h2{font-size:1.5rem;line-height:1.45}
.section-title{align-items:flex-end;gap:16px}
.section-title>button{flex-shrink:0;min-height:44px;font-size:.875rem;white-space:nowrap}
.tabs button{min-height:44px;font-size:.875rem;padding:8px 17px}
.course{display:flex;flex-direction:column;align-items:flex-start;text-align:left;height:100%;font-size:1rem}
.art{width:100%;height:auto;min-height:224px;aspect-ratio:1/1.08;flex-shrink:0;padding:48px 16px 18px;container-type:inline-size;gap:10px;justify-content:flex-end}
.rank{font-size:.8125rem;padding:7px 10px;z-index:2}
.original{top:12px;right:10px;left:48px;text-align:right;font-size:.75rem;line-height:1.3;white-space:nowrap;letter-spacing:-.5px}
.art .number{font-size:clamp(1.625rem,18cqi,3.25rem);line-height:1.1;letter-spacing:-1px;margin:0;white-space:nowrap}
.art strong{font-size:clamp(1rem,9cqi,1.25rem);line-height:1.4;letter-spacing:-.5px;word-break:keep-all;overflow-wrap:anywhere;min-height:2.8em}
.type{font-size:.75rem;line-height:1.5;display:inline-block;flex-shrink:0}
.course h3{font-size:.875rem;line-height:1.6;margin:8px 0 6px;height:4.8em;min-height:4.8em;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;width:100%}
.rating{font-size:.8125rem;line-height:1.65;min-height:2.15em;width:100%;display:flex;align-items:baseline;flex-wrap:wrap;gap:0 4px}
.rating span{overflow-wrap:anywhere}
.price{font-size:.9375rem;line-height:1.6;margin-top:auto;padding-top:6px;display:flex;flex-wrap:wrap;align-items:baseline;column-gap:3px;max-width:100%}
.price small{font-size:.75rem;white-space:nowrap}
.price b{margin-right:2px}
.sample-note{font-size:.75rem;line-height:1.6}
.preview-grid{align-items:stretch}
.preview-card{display:grid;grid-template-columns:minmax(0,1fr) 44px;grid-template-rows:auto 1fr auto;align-items:center;gap:16px 12px;padding:24px;min-height:240px}
.small-label{grid-column:1/-1;font-size:.75rem;line-height:1.5;letter-spacing:1px}
.preview-card>strong{grid-column:1;font-size:1.25rem;line-height:1.5;margin:0}
.play{grid-column:2;position:static;width:44px;height:44px;flex-shrink:0;justify-self:end}
.preview-bottom{grid-column:1/-1;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:12px;font-size:.75rem;line-height:1.6;margin:0;word-break:keep-all;overflow-wrap:anywhere}
.preview-bottom b{white-space:nowrap}
.muted{font-size:.75rem;max-width:45%;text-align:right}
.challenge{flex-wrap:wrap;gap:20px 30px}
.challenge>div:first-child{flex:1;min-width:240px}
.challenge a{font-size:.875rem;min-height:44px;display:flex;align-items:center}
.challenge-stat{margin-left:auto}
.discover-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.discover-grid button{font-size:.875rem;min-height:48px;word-break:keep-all}
.footer-top{grid-template-columns:1.5fr repeat(4,minmax(0,1fr))}
.footer-top h3,.footer-top button,.footer-brand p{font-size:.8125rem}
.footer-top button{min-height:36px;margin-bottom:4px;text-align:left;word-break:keep-all}
.footer-bottom{flex-wrap:wrap;align-items:center;font-size:.75rem;gap:18px}
.footer-bottom strong{font-size:.8125rem}
dialog{max-height:85dvh;overflow:auto;padding:32px 24px}
dialog .art{height:auto;min-height:220px;aspect-ratio:auto}
@media(min-width:93.75rem){.wrap{max-width:1240px}.hero-card{min-height:350px}}
@media(max-width:74.99rem){
 .cards{grid-template-columns:repeat(4,minmax(0,1fr))}
 .categories{grid-template-columns:repeat(10,76px);overflow-x:auto;overscroll-behavior-inline:contain;gap:16px;padding:5px 0 8px}
 .preview-card{padding:20px;gap:16px 10px}
 .preview-card>strong{font-size:1.125rem}
 .challenge-stat{display:none}
}
@media(max-width:61.99rem){
 .cards{grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 18px}
 .hero-grid{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(300px,47%);grid-template-columns:none;overflow-x:auto;scroll-snap-type:x mandatory;overscroll-behavior-inline:contain;padding-bottom:8px}
 .hero-card{scroll-snap-align:start;min-height:320px;padding:26px}
 .hero-card h1{font-size:1.375rem}
 .hero-num{font-size:3rem}
 .preview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .preview-card>strong{font-size:1.25rem}
 .footer-top{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
 .footer-brand{grid-column:1/-1}
 .nav-links{gap:8px 12px}
 .muted{display:none}
}
@media(max-width:43.74rem){
 .wrap{padding-left:20px;padding-right:20px}
 .top{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;padding-top:16px;padding-bottom:16px}
 .logo{font-size:1.625rem}
 .top>.logo{grid-column:1;grid-row:1;justify-self:start}
 .header-right{display:contents}
 #search{grid-column:1/-1;grid-row:2;width:100%;gap:8px}
 #search input{flex:1;width:100%;min-height:44px}
 .login{grid-column:2;grid-row:1;font-size:.875rem}
 .chat{display:none}
 .nav-inner{min-height:60px;gap:12px;padding-top:8px;padding-bottom:8px;align-items:center}
 #menu{font-size:1rem;gap:8px;padding:0}
 .nav-links{gap:4px 12px;font-size:.75rem}
 .nav-links i{display:none}
 .nav-links button:nth-of-type(2){display:none}
 .hero-section{padding-top:24px;padding-bottom:24px}
 .hero-grid{grid-auto-columns:88%;gap:12px}
 .hero-card{padding:24px;min-height:320px}
 .hero-card h1{font-size:1.375rem}
 .slide-controls{gap:8px;margin-top:12px}
 .page-count{margin-right:0;white-space:nowrap}
 .categories{margin-top:22px;grid-template-columns:repeat(10,68px);gap:12px}
 .category{font-size:.75rem}
 .category .icon{width:54px;height:54px;font-size:25px}
 .challenge{padding-top:26px;padding-bottom:26px;gap:12px}
 .challenge>div:first-child{flex-basis:100%;min-width:0}
 .challenge h2{font-size:1.25rem}
 .challenge a{margin-left:0}
 .best{padding-top:36px;padding-bottom:28px}
 .section-title{gap:12px;margin-bottom:20px;align-items:center}
 h2{font-size:1.375rem}
 .eyebrow{font-size:.75rem;letter-spacing:.3px}
 .cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 14px}
 .art{min-height:220px;padding:48px 14px 16px}
 .original{font-size:.6875rem;left:44px;right:8px}
 .rank{font-size:.75rem;padding:7px 9px}
 .price{font-size:.875rem;column-gap:2px}
 .preview{padding-top:16px;padding-bottom:36px}
 .preview-grid{grid-template-columns:1fr;gap:16px}
 .preview-card{min-height:228px;padding:24px;grid-template-columns:minmax(0,1fr) 44px}
 .preview-card>strong{font-size:1.375rem}
 .discover{padding-top:28px;padding-bottom:40px}
 .discover h2{font-size:1.25rem}
 .discover-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 16px;padding:12px}
 .discover-grid button{font-size:.8125rem;gap:6px;padding:12px 0}
 .footer-top{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 20px}
 .footer-bottom{display:block;padding-top:24px}
 .footer-bottom>span{display:block;margin-top:18px}
 .social{display:none}
 #backtop{right:12px;bottom:12px;width:44px;height:44px}
}
@media(max-width:23.4rem){
 .wrap{padding-left:16px;padding-right:16px}
 .cards{grid-template-columns:minmax(0,1fr)}
 .art{min-height:240px;aspect-ratio:1.25}
 .course h3{height:auto;min-height:0;-webkit-line-clamp:3}
 .rating{min-height:0}
 .price{margin-top:0}
 .nav-links{max-width:65%;gap:0 10px}
 .hero-grid{grid-auto-columns:96%}
 .hero-card{padding:20px}
 .hero-card h1{font-size:1.25rem}
 .section-title{flex-wrap:wrap}
 .discover-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

#search input::placeholder{color:#777780;opacity:1}

.course-image-action,.course-detail{display:block;width:100%;text-align:left;padding:0}.custom-image{padding:0}.custom-image:after{display:none}.custom-image img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}.image-fallback{padding:20px;font-size:1.1rem;font-weight:700}.course-detail:focus-visible,.course-image-action:focus-visible{outline:3px solid #60a5fa;outline-offset:3px}