:root{color-scheme:light;--ink:#00695c;--text:#262d3d;--muted:#616775;--line:#e7e9ee;--surface:#f6f7fa;font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",sans-serif;font-synthesis:none}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;background:#fff;color:var(--text);font-size:16px;line-height:1.7;word-break:keep-all;overflow-wrap:break-word;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
h1,h2,h3,p{margin:0}
h1,h2,h3{color:var(--ink);letter-spacing:-.045em;line-height:1.35}
button,a,summary{-webkit-tap-highlight-color:transparent}
a:focus-visible,summary:focus-visible{outline:3px solid #00796b;outline-offset:5px;border-radius:4px}
.wrap{width:min(1080px,calc(100% - 64px));margin-inline:auto}
.skip-link{position:absolute;top:-100px;left:16px;background:var(--ink);color:#fff;padding:10px 16px;z-index:10}
.skip-link:focus{top:12px}
.site-header{height:88px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-size:19px;font-weight:750;letter-spacing:-.05em}
.brand img{border-radius:9px}
.site-header nav{display:flex;align-items:center;gap:30px;font-size:14px;font-weight:600}
.nav-about{color:var(--muted)}
.nav-download{display:inline-flex;gap:14px;align-items:center;color:var(--ink)}
.hero{text-align:center;padding-block:90px 84px}
.eyebrow{font-size:14px;font-weight:650;color:var(--muted);letter-spacing:-.02em}
.hero .eyebrow{display:flex;justify-content:center;align-items:center;gap:9px}
.dot{width:6px;height:6px;border-radius:50%;background:var(--ink)}
h1{font-size:clamp(42px,5.3vw,66px);font-weight:780;line-height:1.22;letter-spacing:-.065em}
.hero h1{margin-top:23px}
.hero-description{margin-top:24px;color:var(--muted);font-size:18px;line-height:1.8;letter-spacing:-.035em}
.hero-description strong{font-weight:600;color:var(--text)}
.store-links{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:30px}
.button{min-height:52px;min-width:170px;padding:12px 20px;border:1px solid var(--ink);border-radius:9px;display:inline-flex;align-items:center;justify-content:space-between;gap:24px;font-size:15px;font-weight:650;transition:background-color .15s,color .15s}
.primary{background:var(--ink);color:#fff}
.primary:hover{background:#00564c}
.secondary{background:#fff;color:var(--ink);border-color:#d5d9e3}
.secondary:hover{background:#f0f2f7}
.store-note{margin-top:15px;color:var(--muted);font-size:12px}
.features{padding-block:62px 86px;border-top:1px solid var(--line)}
.section-heading h2{margin-top:10px;font-size:32px;font-weight:730}
.section-heading>p:last-child:not(.eyebrow){margin-top:12px;color:var(--muted)}
.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:46px}
.feature-number{display:block;font-size:13px;font-weight:700;color:var(--muted);letter-spacing:.04em;margin-bottom:12px}
.feature h3{font-size:21px;letter-spacing:-.05em;font-weight:700}
.feature p{margin-top:12px;color:var(--muted);font-size:16px;line-height:1.8;min-height:87px}
.feature img{width:100%;border-radius:16px;margin-top:24px;aspect-ratio:600 / 1300;object-fit:contain;background:#f0ede9}
.faq{display:grid;grid-template-columns:1fr 1.55fr;gap:65px;padding-block:72px 90px;border-top:1px solid var(--line)}
.faq h2{font-size:28px;max-width:250px}
.faq-list{border-top:1px solid var(--line)}
details{border-bottom:1px solid var(--line)}
summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:23px;list-style:none;cursor:pointer;font-size:16px;font-weight:600;line-height:1.65}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:22px;font-weight:400;color:var(--muted);flex:none}
details[open] summary::after{content:"−"}
details p{padding:0 30px 24px 0;font-size:15px;color:var(--muted);line-height:1.9}
.download{background:var(--surface);text-align:center}
.download-inner{padding-block:66px 72px}
.download img{margin-inline:auto;border-radius:15px}
.download h2{font-size:30px;margin-top:23px;font-weight:730}
.download p{color:var(--muted);margin-top:12px}
.download .store-links{margin-top:25px}
.site-footer{padding-block:32px}
.footer-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}
.footer-top .brand{font-size:17px}
.footer-links{display:flex;flex-wrap:wrap;gap:18px;font-size:13px;color:var(--muted)}
.site-footer p,.site-footer small{font-size:12px;color:var(--muted);line-height:1.85}
.site-footer p a{text-decoration:underline;text-underline-offset:3px}
.site-footer small{display:block;margin-top:12px}
.not-found{padding-block:80px}
.not-found .eyebrow{margin-top:80px}
.not-found h1{font-size:36px;margin-block:16px}
.not-found .button{margin-top:32px}
@media(min-width:1200px){.feature img{width:calc(100% - 22px);margin-inline:auto}}
@media(max-width:800px){.wrap{width:calc(100% - 40px)}.site-header{height:76px}.hero{padding-block:65px}.feature-grid{gap:20px}.feature h3{font-size:19px}.feature p{font-size:15px;min-height:109px}.faq{grid-template-columns:1fr;gap:30px}.faq h2{max-width:none}.section-heading h2{font-size:28px}}
@media(max-width:600px){.brand{font-size:17px;gap:8px}.brand img{width:31px;height:31px}.nav-about{display:none}.site-header nav{font-size:13px}.nav-download{gap:7px}.hero{padding-block:56px 58px}.hero .eyebrow{font-size:12px;gap:6px}.hero h1{margin-top:20px}.hero-description{font-size:16px;margin-top:21px}.store-links{gap:9px;margin-top:26px}.button{min-width:148px;padding:12px 16px;gap:18px;font-size:14px}.features{padding-block:42px 48px}.section-heading h2{font-size:27px}.section-heading>p:last-child:not(.eyebrow){font-size:15px}.feature-grid{grid-template-columns:1fr;gap:42px;margin-top:32px}.feature-number{margin-bottom:7px}.feature h3{font-size:22px}.feature p{min-height:0;max-width:390px;font-size:16px;margin-top:8px}.feature img{width:min(100%,300px);margin:22px auto 0;border-radius:14px}.faq{padding-block:44px 54px;gap:25px}.faq h2{font-size:26px}summary{font-size:15px;padding-block:20px}details p{padding-right:12px}.download-inner{padding-block:47px 52px}.download h2{font-size:26px;max-width:300px;margin-inline:auto}.download p{font-size:15px}.footer-top{align-items:baseline}.footer-top>a:last-child{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}

.learning-preview{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:32px;background:#f0f4f2;border-radius:16px;margin-bottom:56px}.learning-preview h2{font-size:23px;margin:8px 0}.learning-preview p:last-child{font-size:14px;color:var(--muted)}.learning-preview .button{flex-shrink:0}@media(max-width:600px){.learning-preview{flex-direction:column;align-items:flex-start;padding:24px}.learning-preview h2{font-size:22px}.site-header nav{gap:16px}}

.home-page .hero{padding-bottom:48px}
.home-page .hero h1{font-size:clamp(30px,8.2vw,64px)}
.home-page .hero h1 span{color:#00796b}
.subject-jumps{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:36px}
.subject-jumps a{display:inline-flex;align-items:center;gap:18px;padding:7px 15px;border:1px solid var(--line);border-radius:100px;color:var(--ink);font-size:13px;font-weight:600}
.subject-jumps a:hover{background:var(--surface)}
.subject-jumps span{color:var(--muted)}
.subject-learning{padding-bottom:56px}
.subject-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin-top:30px}
.subject-card{display:flex;flex-direction:column;padding:30px;border:1px solid #dce1ea;border-radius:18px;scroll-margin-top:24px}
.subject-card-heading{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.subject-label{color:var(--ink);font-size:12px;font-weight:700;background:#eaf5f2;padding:4px 10px;border-radius:6px}
.subject-count{color:var(--muted);font-size:12px}
.subject-card h3{font-size:28px;margin:20px 0 14px}
.subject-card>p{color:var(--muted);font-size:15px;line-height:1.9}
.subject-topics{display:flex;flex-wrap:wrap;gap:6px 16px;list-style:none;padding:0;margin:20px 0 26px;color:#4c5262;font-size:12px}
.subject-topics li::before{content:"·";margin-right:5px}
.subject-start{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:auto;padding:15px 18px;background:var(--ink);color:#fff;border-radius:9px;font-size:15px;font-weight:650}
.subject-start:hover{background:#00564c}
.subject-resources{display:grid;gap:1px;margin-top:13px}
.subject-resources a{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;color:var(--ink);font-size:13px}
.subject-resources a:hover,.text-link:hover{text-decoration:underline;text-underline-offset:4px}
.content-note{margin-top:18px;color:var(--muted);font-size:12px;line-height:1.8}
.education-learning{display:grid;grid-template-columns:1fr 1fr;gap:28px 56px;padding:40px;background:#f4f6fc;border:1px solid #e2e7f2;border-radius:18px;margin-bottom:64px}
.education-intro h2{font-size:31px;line-height:1.45;margin-top:12px}
.education-intro>p:not(.eyebrow){margin-top:18px;color:var(--muted);font-size:15px;line-height:1.9}
.text-link{display:inline-flex;gap:14px;margin-top:20px;font-size:14px;font-weight:650;color:var(--ink)}
.education-resources{align-self:center;display:grid;gap:12px}
.education-resources>a{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:19px 20px;background:#fff;border:1px solid #dce3f0;border-radius:10px;color:var(--ink)}
.education-resources>a:hover{border-color:#8c9aba}
.education-resources strong{display:block;font-size:16px;font-weight:650}
.education-resources small{display:block;margin-top:3px;color:var(--muted);font-size:12px}
.education-note{grid-column:1 / -1;margin:0;padding-top:20px;border-top:1px solid #dce3f0}
.faq-list p a{text-decoration:underline;text-underline-offset:3px}
@media(max-width:800px){.education-learning{gap:28px;padding:28px}.education-intro h2{font-size:26px}.education-resources>a{padding:16px}.subject-card{padding:24px}}
@media(max-width:700px){.subject-grid,.education-learning{grid-template-columns:1fr}.subject-card h3{font-size:26px}.subject-learning{padding-bottom:36px}.education-learning{margin-bottom:44px}.education-resources{gap:10px}.education-note{padding-top:16px}.subject-start{font-size:14px}.subject-jumps{gap:8px;margin-top:28px}.subject-jumps a{gap:12px;padding:7px 12px;font-size:12px}.home-page .hero{padding-bottom:36px}}
@media(max-width:360px){.site-header .brand{font-size:15px;gap:6px}.site-header .brand img{width:26px;height:26px}.site-header nav{gap:10px;font-size:12px}.nav-download{gap:3px}.subject-card,.education-learning{padding:20px}.subject-card h3{font-size:24px}.education-intro h2{font-size:24px}.education-resources strong{font-size:15px}}

@media(max-width:600px){.site-header{height:auto;min-height:76px;padding-block:16px;flex-wrap:wrap;gap:16px}.site-header nav{width:100%;justify-content:space-between;gap:12px}.site-header nav .nav-about{display:inline-flex}.site-header .nav-download{display:none}.footer-top{flex-wrap:wrap;gap:16px}.footer-links{flex-wrap:wrap;gap:14px}}

.subject-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.subject-card h3{font-size:25px}.hero-icon{margin:0 auto 24px;border-radius:24px;box-shadow:0 12px 32px #00695c18}.subject-detail{max-width:760px;padding-block:48px 72px}.subject-detail h2{font-size:26px;margin:36px 0 14px}.subject-detail p{margin-bottom:16px;color:var(--muted)}.subject-detail li{margin-block:12px}.breadcrumbs{font-size:14px;color:var(--muted);margin-bottom:30px}.subject-detail h1{font-size:42px;margin-bottom:24px}.feature{border-top:2px solid var(--ink);padding-top:22px}.platform-note{margin-top:28px;padding:18px 22px;background:#f2f7f5;border-radius:10px;color:var(--muted);font-size:14px}@media(max-width:800px){.subject-grid{grid-template-columns:1fr}.subject-detail h1{font-size:32px}}