:root{color-scheme:dark;--bg:#10191b;--panel:#172326;--text:#edf3ee;--muted:#a1b0ac;--mint:#b9edcb;--line:#2b3b3d;--peach:#edba9f;--lilac:#c4b5e7;font-family:Inter,"Segoe UI",Arial,"Malgun Gothic",sans-serif}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:28px}
body{margin:0;background:var(--bg);color:var(--text);line-height:1.6}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
a,button{touch-action:manipulation}
a:focus-visible,button:focus-visible{outline:3px solid var(--peach);outline-offset:6px}
button:hover,a:hover{filter:brightness(1.12)}
.wrap{width:min(1160px,calc(100% - 80px));margin-inline:auto}
.navigation{display:flex;align-items:center;gap:40px;min-height:102px}
.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:700;letter-spacing:-.7px}
.brand-dot{color:var(--mint)}
nav{margin-left:auto;display:flex;gap:30px;font-size:13px;color:var(--muted)}
.language{border:1px solid var(--line);background:none;color:var(--text);padding:7px 14px;border-radius:24px;font-size:12px}
.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:55px;align-items:center;padding-block:68px 105px}
.eyebrow{font-size:11px;font-weight:700;letter-spacing:1.9px;display:flex;align-items:center;gap:10px;color:var(--mint);margin:0 0 25px}
.status-dot{display:inline-block;flex-shrink:0;width:6px;height:6px;border-radius:50%;background:var(--mint);box-shadow:0 0 14px #b9edcb55}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(50px,6.3vw,82px);line-height:1.06;font-weight:600;letter-spacing:-4px;margin-bottom:26px}
h1 span{color:var(--mint)}
.hero-description{max-width:440px;color:var(--muted);font-size:16px;line-height:1.8;margin-bottom:32px}
.actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.button{display:inline-flex;justify-content:center;align-items:center;gap:13px;font-size:13px;font-weight:650;border-radius:7px;padding:14px 20px;transition:transform .2s}
.button:hover{transform:translateY(-2px)}
.primary{background:var(--mint);color:#162824}
.secondary{border:1px solid #607b70;color:var(--mint)}
.text-link{color:var(--text);font-size:13px;border-bottom:1px solid var(--line);padding-bottom:4px}
.release-note{font-size:11px;color:#7c918a;margin:15px 0 0}
.code-scene{position:relative;padding:25px 0 40px}
.code-card{position:relative;z-index:1;background:#182426;border:1px solid #38494a;border-radius:13px;box-shadow:0 30px 70px #0005;transform:rotate(-3deg)}
.code-top{padding:17px 21px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;color:#869994;font-size:11px}
.code-top i{display:inline-block;width:7px;height:7px;border-radius:50%;background:#596d65;margin-right:5px}
.code-top i:first-child{background:#dba590}
.code-top i:nth-child(2){background:#d2c191}
.code-top i:last-child{background:#9fc3a0}
.code-badge{font-size:10px;border:1px solid var(--line);padding:1px 5px;border-radius:4px}
.code-card pre{font-family:Consolas,"Courier New",monospace;padding:28px 30px 34px;font-size:17px;line-height:1.95;margin:0;overflow:auto}
.syntax-purple{color:var(--lilac)}
.syntax-mint{color:var(--mint)}
.syntax-peach{color:var(--peach)}
.code-output{border-top:1px solid var(--line);padding:20px 30px;background:#132022;border-radius:0 0 13px 13px}
.output-label{font-size:9px;letter-spacing:1.8px;color:#819b90}
.code-output p{font:14px Consolas,monospace;color:var(--mint);margin:10px 0 0}
.cursor{margin-left:4px;color:#7ea890}
.floating-note{position:absolute;z-index:2;bottom:10px;right:-12px;display:flex;gap:13px;align-items:center;padding:14px 18px;background:#d2e9d7;color:#263c33;border-radius:10px;box-shadow:0 12px 40px #0004;transform:rotate(3deg)}
.floating-note strong{display:block;font-size:12px}
.floating-note div>span{display:block;font-size:10px;color:#5f7468}
.note-icon{font-size:24px}
.orbit{position:absolute;width:300px;height:300px;border:1px solid #334f423d;border-radius:50%;top:-35px;right:-35px}
.orbit-two{width:390px;height:390px;top:-80px;right:-80px}
.facts{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line);padding-block:26px;gap:20px}
.facts div{display:flex;align-items:center;gap:15px}
.facts strong{font-size:26px;font-weight:500;letter-spacing:-1px}
.facts span{font-size:11px;line-height:1.5;color:var(--muted);max-width:110px}
.section{padding-block:105px}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:50px;margin-bottom:36px}
h2{font-size:42px;line-height:1.18;font-weight:550;letter-spacing:-1.6px;margin-bottom:0}
.section-heading .eyebrow{margin-bottom:17px}
.section-aside{max-width:355px;color:var(--muted);font-size:14px;margin:0}
.section-aside p{margin-bottom:17px}
.theme-switch{display:flex;gap:4px;background:#182526;border:1px solid var(--line);padding:4px;border-radius:30px;width:max-content}
.theme-switch button{border:0;background:none;color:var(--muted);border-radius:22px;padding:6px 18px;font-size:11px}
.theme-switch button[aria-pressed=true]{background:#d4e6d9;color:#20332a}
.ide-frame{margin:0;border:1px solid #3d514b;border-radius:12px;padding:9px;background:#1e2e2d;box-shadow:0 25px 65px #0003}
.frame-caption{display:flex;justify-content:space-between;padding:7px 7px 14px;color:#97b0a4;font-size:10px}
.frame-caption>span:first-child{display:flex;align-items:center;gap:8px}
.ide-frame img{display:block;width:100%;height:auto;border-radius:5px}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:52px;margin-top:45px}
.feature-icon{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:#243c32;color:var(--mint);font-size:16px;border-radius:9px;margin-bottom:17px}
.peach{background:#3e312b;color:var(--peach)}
.lilac{background:#322f41;color:var(--lilac)}
h3{font-size:19px;font-weight:550;letter-spacing:-.4px;margin-bottom:10px}
.feature-grid p,.path-grid p{font-size:13px;color:var(--muted);line-height:1.8;margin-bottom:0}
.learning{background:#152123;border-block:1px solid var(--line)}
.path-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:48px 0 35px}
.path-grid article{padding:0 32px;border-left:1px solid #3a4a46}
.path-grid article:first-child{padding-left:0;border:0}
.path-grid article:last-child{padding-right:0}
.step{display:block;font-size:10px;letter-spacing:1.8px;color:var(--mint);margin-bottom:25px}
.learning-note{max-width:660px;font-size:11px;line-height:1.7;color:#829a90;margin:15px 0 0}
.story-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:85px}
.story h2{font-size:35px;line-height:1.4}
.story h2 span{color:var(--mint)}
.story-grid p{font-size:14px;color:var(--muted);line-height:1.85}
.closing{text-align:center;border:1px solid #476454;border-radius:15px;padding:55px 30px;background:radial-gradient(ellipse at 50% 140%,#38513d80,transparent 75%)}
.closing .eyebrow{display:block;margin-bottom:18px}
.closing h2{font-size:46px;margin-bottom:25px}
footer{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:45px;font-size:11px;color:#839b90}
footer .brand{font-size:17px;color:var(--text)}
footer p{margin:0}
footer>div{display:flex;gap:24px}
html[lang=ko] h1{font-size:clamp(46px,5.4vw,70px);line-height:1.2;letter-spacing:-3px}
html[lang=ko] h2{line-height:1.35;word-break:keep-all}
html[lang=ko] p{word-break:keep-all}

@media(min-width:1500px){.hero{padding-block:100px 125px}
}
@media(max-width:1000px){.wrap{width:calc(100% - 48px)}
.hero{gap:30px}
.code-card pre{font-size:14px;padding:25px 20px}
.floating-note{right:0}
.orbit{right:0}
.orbit-two{right:0;width:320px;height:320px}
.facts div{display:block}
.facts span{display:block;margin-top:3px}
.section{padding-block:75px}
.feature-grid{gap:28px}
.story-grid{gap:35px}
.story h2{font-size:29px}
}

@media(max-width:700px){.wrap{width:calc(100% - 40px)}
.navigation{min-height:80px;gap:12px}
.brand{font-size:19px}
nav{gap:16px}
nav a:not(:last-child){display:none}
.language{padding:6px 10px}
.hero{grid-template-columns:1fr;padding-block:35px 55px;gap:28px}
h1{font-size:65px}
.hero-description{font-size:15px}
.hero .eyebrow{font-size:9px;letter-spacing:1.3px}
.code-scene{max-width:440px;width:100%;margin:auto;padding:20px 7px 35px}
.code-card pre{font-size:16px}
.floating-note{right:0}
.facts{grid-template-columns:1fr;gap:20px}
.facts div{display:flex}
.facts strong{min-width:50px}
.facts span{max-width:120px}
.section-heading{display:block}
.section-aside{max-width:100%;margin-top:25px}
h2{font-size:34px}
.frame-caption>span:last-child{display:none}
.ide-frame{padding:5px;border-radius:7px}
.feature-grid,.path-grid,.story-grid{grid-template-columns:1fr;gap:30px}
.feature-grid article{display:grid;grid-template-columns:40px 1fr;column-gap:16px}
.feature-icon{grid-row:1/3;margin:0}
.feature-grid p{grid-column:2}
.feature-grid h3{margin-bottom:5px}
.path-grid{margin-top:35px}
.path-grid article,.path-grid article:first-child{border:0;border-top:1px solid var(--line);padding:25px 0 0}
.step{margin-bottom:13px}
.story-grid{gap:25px}
.story h2{font-size:30px}
.closing{padding:42px 20px}
.closing h2{font-size:34px}
footer{flex-wrap:wrap;padding-block:32px}
footer p{width:100%;order:3}
.section{padding-block:60px}
html[lang=ko] h1{font-size:53px}
}

@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
.button{transition:none}
}

.credits{border-top:1px solid var(--line);padding-top:24px;margin-top:60px;color:var(--muted);font-size:12px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
.credits p{margin:0}
.reader{max-width:850px;padding-block:50px}
.reader h1,html[lang=ko] .reader h1{font-size:42px;line-height:1.3;letter-spacing:-1.5px;margin-bottom:25px}
.reader h2{font-size:26px;margin:42px 0 18px}
.reader h3{margin-top:28px}
.reader p,.reader li{color:var(--muted);line-height:1.9}
.reader strong{color:var(--text)}
.reader code{font-family:Consolas,"Courier New",monospace;color:var(--mint);font-size:.95em}
.reader p code{background:var(--panel);padding:2px 5px;border-radius:4px}
.lesson-screenshot{margin:28px 0}
.lesson-screenshot img{display:block;max-width:100%;height:auto;border:1px solid var(--line);border-radius:9px}
.lesson-screenshot figcaption{margin-top:10px;font-size:13px;color:var(--muted)}
.reader pre{background:var(--panel);border:1px solid var(--line);padding:22px;border-radius:9px;overflow-x:auto;font-size:14px;line-height:1.7}
.lesson-goal{font-size:17px;border-left:3px solid var(--mint);padding-left:20px;margin-bottom:38px}
.code-label{font-size:11px;color:var(--mint);margin:25px 0 -8px}
.reader details{border:1px solid var(--line);border-radius:9px;padding:15px;margin-block:25px}
.reader summary{cursor:pointer;color:var(--mint);font-size:13px}
.lesson-navigation{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:30px;margin-top:45px}
.lesson-index{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.lesson-index a{display:flex;gap:16px;padding:16px;border:1px solid var(--line);border-radius:7px;color:var(--text);font-size:13px;line-height:1.5}
.lesson-index a:hover{background:var(--panel);border-color:#607b70}
.lesson-index span{color:var(--mint);font-family:Consolas,monospace}
.reader .lesson-section{margin:14px 0;padding:0;overflow:hidden}
.reader .lesson-section summary{display:flex;align-items:center;gap:18px;padding:22px;list-style:none;color:var(--text)}
.lesson-section summary::-webkit-details-marker{display:none}
.lesson-section summary::before{content:"+";color:var(--mint);font-size:23px;width:18px;flex-shrink:0;text-align:center}
.lesson-section[open] summary::before{content:"−"}
.lesson-section-title{font-size:17px;font-weight:600;line-height:1.5}
.lesson-section-count{margin-left:auto;flex-shrink:0;font-size:12px;color:var(--muted)}
.lesson-section summary:hover{background:var(--panel)}
.lesson-section summary:focus-visible{outline:2px solid var(--mint);outline-offset:-3px}
.lesson-section .lesson-index{margin:0;padding:0 22px 22px}
@media(max-width:700px){.reader .lesson-section summary{flex-wrap:wrap;gap:10px;padding:18px}.lesson-section-title{flex:1;font-size:16px}.lesson-section-count{width:100%;margin-left:28px}.lesson-section .lesson-index{padding:0 18px 18px}}
@media(max-width:700px){.lesson-index{grid-template-columns:1fr}.reader h1,html[lang=ko] .reader h1{font-size:32px}.reader pre{padding:15px;font-size:12px}}