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body{font-size:16px;letter-spacing:-.035em;line-height:1.85;background:#fff;color:var(--ink)}
.container,.header-inner{width:min(1200px,calc(100% - 80px))}h1,h2,h3{font-weight:800;letter-spacing:-.055em;line-height:1.35}h2{font-size:38px}h3{font-size:25px}p{word-break:keep-all;overflow-wrap:break-word}a,button{touch-action:manipulation}
.site-header{height:92px;background:#fff;border-bottom:1px solid var(--line)}.site-header nav{gap:25px;font-size:14px;font-weight:650}.site-header nav .nav-contact{border-radius:8px;background:#1c1c1c;border-color:#1c1c1c;color:white;padding:10px 16px}.site-header nav a.active:after{background:#595959}
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.route-strip{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line);padding:25px 0;gap:0}.route-strip>a{display:flex;gap:18px;align-items:center;padding:5px 26px;border-right:1px solid var(--line)}.route-strip>a:first-child{padding-left:0}.route-strip>a:last-child{border:0}.route-strip>a>span{font-family:Arial,sans-serif;font-size:29px;font-weight:800;color:#dedede}.route-strip small{display:block;font-size:12px;color:var(--muted)}.route-strip strong{display:block;font-size:20px;line-height:1.6}
.feature-section{padding:90px 0}.aside-feature{display:grid;grid-template-columns:1.25fr 1fr;gap:65px;align-items:center}.feature-preview{background:#eef4f1;padding:24px;border-radius:16px;border:1px solid var(--line)}.feature-preview img{height:345px;object-fit:cover;object-position:top;border-radius:8px;border:1px solid #f3f3f3}.feature-preview>span{display:block;font-size:12px;color:#595959;margin-top:14px}.feature-copy h3{font-size:32px}.feature-copy>p:not(.eyebrow){margin-top:18px;font-size:16px;color:var(--muted)}.feature-links{list-style:none;padding:0;margin:24px 0}.feature-links a{display:block;border-top:1px solid var(--line);padding:12px 0;font-size:13px;color:#595959}.feature-links strong{color:var(--ink);font-size:16px;margin:0 12px}.feature-copy .eyebrow{font-size:11px}
.courses-band{background:#f3f5f0;border-block:1px solid var(--line);padding:75px 0}.home-course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.course-card{border:1px solid #dedede;border-radius:12px;background:white;padding:26px;display:flex;flex-direction:column;min-width:0}.course-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}.course-number{font-family:Arial,sans-serif;font-size:30px;font-weight:700;color:#595959;line-height:1}.course-audience{font-size:11px;background:#fafafa;color:#595959;padding:4px 9px;border-radius:4px}.course-card h3{font-size:23px;line-height:1.5}.course-card>p{font-size:15px;color:var(--muted);margin-top:16px}.course-card dl{margin:20px 0 18px;border-top:1px solid var(--line);padding-top:16px;font-size:14px}.course-card dt{font-size:11px;color:#595959;margin-bottom:5px}.course-card dd{margin:0;font-weight:600}.course-card details{border-top:1px solid var(--line);font-size:13px;margin-top:auto;padding:12px 0}.course-card summary{list-style:none;display:flex;justify-content:space-between;gap:10px;cursor:pointer;font-weight:600}.course-card summary::-webkit-details-marker{display:none}.course-card details[open] summary span{transform:rotate(45deg)}.course-card ol{padding-left:21px;line-height:1.8;margin:15px 0}.course-prepared{background:#f4f6f2;padding:10px;border-radius:5px;font-size:12px!important;color:#595959}.course-card>.text-link{font-size:13px;margin-top:15px;align-self:flex-start}.course-grid{gap:25px}.course-grid .course-card{padding:32px}.course-grid .course-card h3{font-size:27px}.course-grid .course-card>p{font-size:16px}
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.page-heading{padding:65px 0 42px;border-bottom:1px solid var(--line)}.page-heading h1{font-size:52px;line-height:1.3;font-weight:900}.page-heading>p:not(.eyebrow){font-size:18px;margin-top:25px;color:var(--muted);max-width:750px}.course-jump{display:flex;flex-wrap:wrap;gap:10px;padding-top:26px}.course-jump a{font-size:13px;border:1px solid #dedede;padding:8px 13px;border-radius:7px;background:#f8faf6}.course-jump a:hover{background:#f3f3f3}.course-catalog{padding:35px 0 75px}.teaching-process{padding:65px 0;background:#eef4ef}.process-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}.process-grid article{border-top:1px solid #dedede;padding-top:20px}.process-grid article>span{font-size:14px;font-weight:800;color:#595959}.process-grid h3{font-size:24px;margin:15px 0 12px}.process-grid p{font-size:16px;color:var(--muted)}
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.video-library{padding:32px 0 65px}.toolbar{gap:25px;align-items:center}.filters{gap:9px}.filter{font-size:13px;padding:9px 13px;border-radius:6px}.filter.active{background:#1c1c1c;border-color:#1c1c1c}.search-wrap input{font-size:14px;padding:11px 13px;border-radius:6px}#result-count{font-size:13px;margin:20px 0;color:var(--muted)}.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px 24px}.video-grid .video-card h3{font-size:19px}.video-grid .meta{font-size:11px}.empty-state{grid-column:1/-1}
.about-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:85px;padding:55px 0 85px}.about-statement{background:#fafafa;border-radius:15px;padding:38px;align-self:start}.brand-monogram{font-size:48px;font-weight:900;width:82px;height:82px;display:grid;place-items:center;background:#fff;border:1px solid #828282;border-radius:20px;margin-bottom:30px}.about-statement h2{font-size:32px}.about-statement p{font-size:16px;margin-top:23px;color:#595959}.about-text h2{font-size:28px}.about-text>p{font-size:18px;color:var(--muted);margin:22px 0}.about-text h3{font-size:24px;margin-top:35px}.career-list{list-style:none;padding:0;margin:15px 0 35px}.career-list li{padding:16px 0;border-bottom:1px solid var(--line)}.career-list strong{font-size:16px;display:block}.career-list span{font-size:14px;color:var(--muted)}.contact-layout{grid-template-columns:.8fr 1.2fr;gap:65px;padding:50px 0 75px}.contact-aside h2{font-size:28px}.contact-aside p{font-size:16px}.contact-form{border-radius:12px;padding:30px}.contact-form input,.contact-form textarea,.contact-form select{font-size:16px;border-radius:6px}.contact-form label{font-size:14px}.contact-chat{margin-top:45px;border-top:1px solid var(--line);padding-top:25px}.contact-chat h3{font-size:21px}.form-note{font-size:12px}.retired-actions{padding:35px 0 100px;display:flex;gap:15px}
@media(min-width:851px){.menu-toggle{display:none}}
@media(max-width:1100px){.site-header nav{gap:15px;font-size:13px}.home-hero{gap:35px}.home-hero h1{font-size:48px}.guide-cover h3{font-size:26px}.cover-top,.cover-bottom{font-size:10px}.aside-feature{gap:40px}.home-course-grid{gap:16px}.course-card{padding:21px}.course-card h3{font-size:21px}.stack-videos .video-card{grid-template-columns:42% 1fr}.stack-videos .video-card h3{font-size:15px}.stack-videos .watch-label{display:none}}
@media(max-width:850px){.container,.header-inner{width:calc(100% - 44px)}.site-header{height:76px}.menu-toggle{display:block;border:1px solid #dedede;border-radius:6px;background:white;padding:7px 12px;font-size:14px}.site-header nav{display:none;position:absolute;left:0;right:0;top:75px;background:#fff;border-bottom:1px solid var(--line);padding:20px 22px;font-size:16px}.site-header nav.open{display:flex;flex-direction:column;align-items:stretch;gap:8px}.site-header nav .nav-contact{margin:8px 0 0}.wordmark strong{font-size:25px}.home-hero{grid-template-columns:1fr 1fr;padding:45px 0;gap:25px}.home-hero h1{font-size:37px}.hero-deck{font-size:17px}.hero-small{font-size:14px}.hero-small br{display:none}.hero-actions{gap:8px}.hero-actions .button{font-size:12px;padding:10px 12px;gap:12px}.hero-footnote{font-size:10px}.guide-cover h3{font-size:23px;padding:18px}.cover-top{padding:18px 18px 0}.cover-screen{height:155px;margin:0 18px}.cover-bottom{padding:13px 18px;gap:6px}.hero-art{padding-left:0}.art-note{font-size:12px}.art-label{font-size:10px}.route-strip>a{padding:5px 15px;gap:12px}.route-strip strong{font-size:17px}.route-strip small{font-size:10px}.route-strip>a>span{font-size:23px}.feature-section,.video-section-v4{padding:60px 0}.section-heading h2{font-size:30px}.section-heading p{font-size:15px}.section-heading .text-link{font-size:12px;flex-shrink:0}.aside-feature{gap:28px}.feature-preview{padding:16px}.feature-preview img{height:300px}.feature-copy h3{font-size:26px}.feature-copy>p:not(.eyebrow){font-size:14px}.feature-links strong{font-size:14px;margin:0 5px}.home-course-grid{grid-template-columns:1fr}.home-course-grid .course-card{display:grid;grid-template-columns:1fr 1fr;gap:12px 28px;padding:25px}.home-course-grid .course-top{grid-column:1/-1;margin-bottom:0}.home-course-grid .course-card>p{margin:0}.home-course-grid .course-card dl{margin:0;padding:0;border:0}.home-course-grid .course-card details{margin:0}.home-course-grid .course-card>.text-link{margin-top:0}.home-videos{grid-template-columns:1.15fr 1fr;gap:25px}.featured-video .video-card h3{font-size:22px}.stack-videos .video-card{display:block}.stack-videos .video-cover{max-width:240px}.stack-videos .meta{margin-top:8px}.stack-videos .meta span{display:none}.about-strip{gap:40px;padding:50px 0 65px}.about-strip h2{font-size:29px}.about-strip p:not(.eyebrow){font-size:16px}.community h2{font-size:34px}.community-inner{gap:30px}.community p:not(.eyebrow){font-size:14px}.community .button{font-size:13px}.site-footer{padding:35px 22px 20px}.footer-top{grid-template-columns:1fr 1fr}.footer-top>div{grid-column:1/-1;justify-content:flex-start}.page-heading h1{font-size:42px}.page-heading>p:not(.eyebrow){font-size:17px}.course-grid .course-card{padding:24px}.course-grid .course-card h3{font-size:23px}.guide-row{gap:35px}.guide-row h2{font-size:30px}.guide-row>div>p:not(.eyebrow){font-size:16px}.guide-row .cover-screen{height:190px}.resource-grid{gap:25px}.resource-card .cover-screen{height:190px}.checklist-cover{min-height:377px;padding:25px}.checklist-cover h3{font-size:30px}.video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.toolbar{align-items:stretch;flex-direction:column}.search-wrap{width:100%}.about-layout{gap:35px}.about-statement{padding:25px}.about-text>p{font-size:16px}.contact-layout{gap:35px}.contact-form{padding:22px}}
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@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.hero-guide{transform:none}}
.reading-guides{display:grid;grid-template-columns:1fr 1fr;gap:35px;border-top:1px solid var(--line);padding-top:45px;margin-top:65px}.reading-guides img{aspect-ratio:16/9;height:auto;object-fit:cover;border-radius:10px}.reading-guides .eyebrow{margin-top:22px;font-size:12px}.reading-guides h3{font-size:26px}.reading-guides p:not(.eyebrow){font-size:16px;color:var(--muted);margin:15px 0 20px}.reading-guides .text-link{font-size:14px}@media(max-width:600px){.reading-guides{grid-template-columns:1fr;gap:35px;margin-top:45px;padding-top:30px}.reading-guides h3{font-size:24px}}
/* Course overview: explicit progression and separate topic programmes. */
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@media(max-width:600px){.learning-choice{grid-template-columns:1fr;gap:12px;margin-bottom:42px}.learning-choice>a{padding:24px}.learning-choice strong{font-size:25px}.foundation-section{padding-bottom:45px}.foundation-row{padding:22px 0;gap:14px}.foundation-row h3{font-size:23px}.foundation-row p{font-size:15px}.lesson-index{font-size:32px}.lesson-result{padding:14px}.lesson-result strong{font-size:16px}.topic-band .course-catalog{padding:42px 0}.course-operation{padding:45px 0}.course-jump a{font-size:13px}.practice-paths{margin-top:20px}.practice-paths h2{font-size:25px}}
/* V5: editorial black/white with restrained red. Original brand colour stays in logo only. */
:root{--ink:#191919;--paper:#fff;--muted:#555;--line:#dedede;--green:#222;--mint:#eee;--accent:#c63030;--font:'Pretendard','Noto Sans KR','Malgun Gothic',sans-serif}
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h1{font-size:clamp(45px,5vw,72px);letter-spacing:-.065em}.hero-deck{font-size:23px;line-height:1.65}.hero-small{font-size:18px}.hero-art.proof-art{padding:0;position:relative}.proof-tag{font-size:14px;font-weight:700;border-bottom:2px solid #222;padding-bottom:13px;margin-bottom:18px}.proof-main{display:block;background:#f1f1ef;border:1px solid #ccc}.proof-main img{width:100%;height:250px;object-fit:cover;object-position:top}.proof-main>div{padding:19px 24px;background:#222;color:white;display:flex;gap:22px;align-items:center}.proof-main span{font-size:13px;color:#ddd}.proof-main strong{font-size:22px;line-height:1.45}.proof-secondary{display:flex;align-items:center;gap:18px;border:1px solid #ccc;border-top:0;background:white;padding:13px}.proof-secondary img{width:120px;height:70px;object-fit:cover;object-position:top}.proof-secondary span{font-size:16px;font-weight:650}.proof-caption{font-size:13px!important;color:#666;margin-top:12px}.route-strip>a>span{color:#a33}.practice-paths{background:#ddd;border-color:#ddd;border-radius:0}.practice-paths a{background:#fff;padding:32px}.practice-paths span{color:#a52222;font-size:14px}.practice-paths h2{font-size:28px}.practice-paths p{font-size:17px}.guide-cover{background:#f0efeb;border-color:#bbb;color:#222;border-radius:4px;box-shadow:8px 9px 0 #292929}.cover-top,.cover-bottom{font-size:13px}.cover-screen{border-color:#aaa}.feature-preview{background:#f3f3f1;border-radius:4px}.feature-preview>span{font-size:14px;color:#555}.feature-links a{color:#666}.feature-copy .eyebrow{font-size:14px}.courses-band{background:#f4f4f2}.course-card{border-radius:4px;border-color:#ccc}.course-number{color:#a52222}.course-audience{background:#eee;color:#444;font-size:13px}.course-card>p,.course-grid .course-card>p{font-size:17px}.course-card dt{font-size:13px}.course-card 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@media(max-width:800px){.advanced-card{grid-template-columns:1fr}.advanced-visual img{max-height:320px;aspect-ratio:16/9}.custom-topics>div{grid-template-columns:1fr}.resource-single .resource-card{grid-template-columns:1fr;gap:35px}.resource-single .guide-cover{max-width:520px}}
@media(max-width:600px){body{font-size:17px}.site-header{height:78px}.wordmark img{width:134px;height:55px}.home-hero{grid-template-columns:1fr;padding:40px 0;gap:35px}.home-hero h1{font-size:46px;line-height:1.25}.hero-deck{font-size:20px}.hero-small{font-size:17px}.hero-footnote{font-size:13px}.proof-main img{height:190px}.proof-main>div{padding:18px;gap:15px}.proof-main strong{font-size:20px}.proof-secondary img{width:95px}.proof-secondary span{font-size:14px}.page-heading h1{font-size:36px}.page-heading>p:not(.eyebrow){font-size:18px}.level-nav a{font-size:14px;padding:9px 11px}.advanced-section{padding:45px 0}.advanced-copy{padding:24px}.advanced-copy h3{font-size:26px}.advanced-visual{padding:16px}.advanced-copy .eyebrow{font-size:13px}.course-grid .course-card{padding:25px}.course-audience{font-size:12px}.course-card h3{font-size:25px}.course-card dt{font-size:13px}.course-card>.text-link{font-size:15px}.feature-preview>span{font-size:13px}.video-grid .meta{font-size:13px}.stack-videos .video-card h3{font-size:17px}.stack-videos .watch-label{font-size:12px}.footer-top>div{font-size:14px}.cover-top,.cover-bottom{font-size:12px}.about-layout{padding-top:35px}.about-text>p{font-size:18px}.about-statement{padding:28px}.community p:not(.eyebrow){font-size:17px}.chat-top{font-size:15px}.custom-topics h4{font-size:21px}}
.home-specialists{border-top:2px solid #222;margin-top:35px;padding-top:25px}.home-specialists h3{font-size:24px}.home-specialists>div{display:grid;grid-template-columns:1fr 1fr;gap:0 30px;margin-top:15px}.home-specialists a{padding:15px 0;border-bottom:1px solid #ccc;font-size:16px}.studio-process{background:#fff;border:1px solid #222;padding:28px}.studio-process>span{font-size:13px}.studio-process strong{display:block;font-size:42px;line-height:1.3;margin:24px 0;color:#a52222}.studio-process ol{padding:0;list-style:none;font-size:16px}.studio-process li{padding:12px 0;border-top:1px solid #ccc}@media(max-width:600px){.home-specialists>div{grid-template-columns:1fr}.home-specialists h3{font-size:23px}.proof-main>div{display:block}.proof-main strong{display:block;margin-top:8px}.studio-process strong{font-size:35px}}

/* Free tool archive: editorial cards with explanatory diagrams */
.archive-intro{display:flex;justify-content:space-between;gap:24px;border-top:3px solid #222;border-bottom:1px solid #ccc;padding-top:22px;padding-bottom:22px}.archive-intro strong{font-size:24px}.archive-intro p{font-size:15px;margin:0;color:#666}.archive-jump{display:flex;flex-wrap:wrap;gap:10px;padding-top:24px;padding-bottom:36px}.archive-jump a{padding:10px 17px;border:1px solid #bbb;border-radius:50px;font-weight:700}.archive-jump a:hover{background:#222;color:#fff}.archive-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;align-items:start}.archive-card{border:1px solid #d4d0ca;background:#fff;scroll-margin-top:100px;overflow:hidden}.archive-card>img{display:block;width:100%;height:auto}.archive-body{padding:32px}.archive-kicker{font-weight:700;color:#a3372b;font-size:14px!important;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}.archive-kicker span{color:#555}.archive-body h2{font-size:34px;line-height:1.3;letter-spacing:-1.4px;margin:20px 0}.archive-body p{font-size:17px;line-height:1.8}.archive-example{font-size:16px;border-left:3px solid #b44432;padding:10px 14px;background:#f6f4f0;margin:22px 0}.archive-body dl{display:grid;grid-template-columns:90px 1fr;gap:12px;font-size:15px;line-height:1.7}.archive-body dt{font-weight:700}.archive-body dd{margin:0;color:#555}.archive-body details{border-top:1px solid #ddd;border-bottom:1px solid #ddd;margin:24px 0;padding:18px 0}.archive-body summary{cursor:pointer;font-size:18px;font-weight:700}.archive-body summary span{float:right}.archive-body ol{padding-left:22px;line-height:1.9;font-size:16px}.archive-body .archive-note{font-size:15px;background:#f5f3ef;padding:16px}.archive-body small{display:block;color:#777;font-size:13px;margin-top:16px}.archive-bottom{margin-top:60px;margin-bottom:60px;padding-top:32px;border-top:3px solid #222}.archive-bottom h2{font-size:30px}.archive-bottom p{font-size:18px;line-height:1.9;max-width:880px}.archive-bottom a{text-decoration:underline}.archive-home{margin-top:16px;margin-bottom:24px}.archive-home a{display:flex;justify-content:space-between;gap:20px;padding:23px;background:#f4f1eb;border-left:4px solid #c63030}.archive-home strong{font-size:21px}.archive-home span{font-size:17px}#navigation{gap:18px}@media(max-width:800px){.archive-grid{grid-template-columns:1fr}.archive-intro{flex-direction:column}.archive-body{padding:23px}.archive-body h2{font-size:30px}.archive-home a{flex-direction:column}.archive-jump{gap:8px}.archive-jump a{font-size:14px;padding:9px 12px}}