:root{--navy:#122944;--ink:#1d2b3a;--muted:#66717d;--cream:#f8f2e8;--white:#fff;--coral:#e76f51;--mint:#73d2bd;--mint-soft:#e8f7f3;--sun:#ffd166;--line:rgba(18,41,68,.1)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);color:var(--ink);font-family:Inter,Pretendard,"Noto Sans KR",Arial,sans-serif}button,input,select{font:inherit}button,a{touch-action:manipulation}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:18px;min-height:70px;padding:10px max(20px,calc((100vw - 1160px)/2));border-bottom:1px solid var(--line);background:rgba(248,242,232,.96);backdrop-filter:blur(10px)}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}.brand>span{display:grid;width:44px;height:44px;place-items:center;border-radius:13px;background:var(--navy);color:#fff;font-weight:900}.brand b{line-height:1.1}.brand small{display:block;margin-top:4px;color:var(--muted);font-size:11px}.toc-link{margin-left:auto;border-radius:9px;background:var(--navy);padding:9px 13px;color:#fff;font-size:13px;font-weight:800;text-decoration:none}.progress-summary{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;font-weight:700}.progress-summary i{display:block;width:100px;height:7px;overflow:hidden;border-radius:99px;background:#d8d3ca}.progress-summary i b{display:block;width:0;height:100%;background:var(--coral)}.lesson-nav{border-bottom:1px solid var(--line);background:rgba(255,255,255,.6);padding:10px max(20px,calc((100vw - 1160px)/2))}.ranges,.lesson-buttons{display:flex;gap:7px;overflow:auto;padding:3px 0;scrollbar-width:none}.ranges button,.lesson-buttons button{flex:none;border:1px solid var(--line);border-radius:99px;background:#fff;padding:7px 11px;color:var(--muted);font-size:12px;font-weight:800}.ranges button.active,.lesson-buttons button.active{border-color:var(--navy);background:var(--navy);color:#fff}.lesson-buttons button.done:before{content:"✓ ";color:var(--mint)}#app{width:min(1160px,calc(100% - 32px));margin:28px auto 70px}.hero{display:grid;grid-template-columns:1.55fr .8fr;gap:20px}.hero-main,.card{border:1px solid var(--line);border-radius:24px;background:#fff;padding:26px;box-shadow:0 14px 40px rgba(18,41,68,.05)}.hero-main{min-height:310px;background:linear-gradient(140deg,var(--navy),#1d496b);color:#fff}.eyebrow,.kicker{margin:0 0 9px;color:var(--coral);font-size:11px;font-weight:900;letter-spacing:.13em}.hero-main .eyebrow{color:var(--sun)}.hero-main h1{max-width:760px;margin:25px 0 12px;font-size:clamp(34px,5vw,64px);line-height:1.05}.hero-main p{max-width:650px;color:rgba(255,255,255,.75);line-height:1.75}.hero-actions,.source-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.primary,.secondary,.listen{border:0;border-radius:10px;padding:10px 14px;font-weight:900}.primary{background:var(--coral);color:#fff}.secondary{background:rgba(255,255,255,.12);color:#fff}.route ol{display:grid;gap:13px;margin:20px 0 0;padding:0;list-style:none}.route li{display:flex;align-items:center;gap:10px;font-weight:700}.route li b{display:grid;width:27px;height:27px;place-items:center;border-radius:50%;background:var(--cream);font-size:11px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}.card h2{margin:0;font-size:24px}.dialogues{display:grid;gap:17px;margin-top:20px}.dialogue{display:grid;grid-template-columns:30px 1fr auto;gap:10px;align-items:start}.speaker{display:grid;width:28px;height:28px;place-items:center;border-radius:9px;background:var(--navy);color:#fff;font-size:11px}.dialogue strong,.example strong{display:block;line-height:1.5}.translation{display:block;margin-top:4px;color:var(--muted);font-size:13px;line-height:1.55}.label{display:inline-block;margin-right:6px;border-radius:5px;background:var(--cream);padding:2px 5px;color:var(--navy);font-size:10px;font-weight:900}.dialogue button,.example button{border:0;border-radius:9px;background:var(--cream);padding:8px}.source{display:inline-block;margin-top:5px;color:var(--coral);font-size:11px;font-weight:800;text-decoration:none}.intent,.grammar-box{margin-top:18px;border-radius:16px;background:var(--cream);padding:18px}.intent b,.grammar-box b{display:block;color:var(--navy);font-size:19px}.intent span{display:block;margin-top:7px;color:var(--muted);font-size:13px}.contrast{border-left:4px solid var(--coral);padding-left:13px;font-weight:700;line-height:1.65}.quote{margin:20px 0 8px;font-size:25px;font-weight:900;line-height:1.35}.source-actions .listen{background:var(--navy);color:#fff}.source-actions a{margin-left:auto;color:var(--coral);font-size:12px;font-weight:900}.supplements{margin-top:20px;border-color:rgba(115,210,189,.55);background:linear-gradient(145deg,#f1fbf8,#fff)}.example-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px;margin-top:18px}.example{position:relative;border:1px solid var(--line);border-radius:14px;background:#fff;padding:15px 48px 15px 15px}.example>span{display:inline-block;margin-bottom:8px;border-radius:6px;background:var(--cream);padding:4px 7px;color:var(--coral);font-size:11px;font-weight:900}.example button{position:absolute;top:12px;right:12px}.chunks{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin-top:18px}.chunk{min-height:105px;border:1px solid var(--line);border-radius:14px;background:var(--cream);padding:15px;text-align:left}.mission{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-top:16px;border-radius:16px;background:var(--navy);padding:18px;color:#fff}.mission p{margin:5px 0;color:rgba(255,255,255,.78)}.quiz-options{display:grid;gap:9px;margin-top:16px}.quiz-option{border:1px solid var(--line);border-radius:12px;background:#fff;padding:13px;text-align:left}.quiz-option.correct{border-color:#2f9b77;background:#effaf6}.quiz-option.wrong{border-color:var(--coral);background:#fff1ed}.feedback{min-height:22px;color:var(--muted);font-weight:800}.finish{display:flex;justify-content:flex-end;margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}footer{padding:28px;text-align:center;color:var(--muted);font-size:12px}footer a{color:var(--coral)}.loading{text-align:center;color:var(--muted)}.toc-wrap{width:min(1050px,calc(100% - 32px));margin:30px auto}.toc-hero{border-radius:24px;background:var(--navy);padding:30px;color:#fff}.toc-hero p{color:var(--sun);font-size:12px;font-weight:900}.toc-hero h1{margin:7px 0 20px;font-size:45px}.toc-hero label{display:grid;gap:7px;color:rgba(255,255,255,.75);font-size:12px}.toc-hero input{width:100%;border:0;border-radius:12px;padding:13px}.toc-wrap>.ranges{margin:18px 0}.toc-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:10px}.toc-item{display:block;border:1px solid var(--line);border-radius:14px;background:#fff;padding:14px;color:var(--ink);text-decoration:none}.toc-item span{color:var(--coral);font-size:12px;font-weight:900}.toc-item b{display:block;margin:5px 0}.toc-item small{color:var(--muted)}
@media(max-width:760px){.site-header{gap:10px}.progress-summary span{display:none}.progress-summary i{width:54px}.hero,.grid{grid-template-columns:1fr}.hero-main,.card{padding:20px;border-radius:19px}.hero-main{min-height:260px}.hero-main h1{font-size:38px}.mission{align-items:flex-start;flex-direction:column}.dialogue{grid-template-columns:30px 1fr auto}.source-actions a{width:100%;margin-left:0}.toc-link{padding:8px}.brand small{display:none}}
.usage-points{display:grid;gap:9px;margin:16px 0 0;padding-left:20px}.usage-points li{padding-left:3px;line-height:1.62}.usage-points li::marker{color:var(--coral)}
.practice-examples{margin-top:20px;border-color:rgba(115,210,189,.55);background:linear-gradient(145deg,#f1fbf8,#fff)}.section-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.section-heading .source-actions{flex:none;margin-top:0}.example mark{background:transparent;color:var(--coral);font-weight:950}
.practice-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(310px,.85fr);gap:18px;align-items:start}.sentence-builder{position:sticky;top:92px;min-height:390px;margin-top:18px;border:1px solid rgba(235,106,77,.3);border-radius:18px;background:#fff8f2;padding:18px;box-shadow:0 12px 28px rgba(18,41,68,.07)}.builder-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.builder-heading h3{margin:0;color:var(--navy);font-size:21px}.builder-heading>b{border-radius:99px;background:var(--navy);padding:5px 9px;color:#fff;font-size:11px}.builder-origin{margin:10px 0 4px;color:var(--coral);font-size:11px;font-weight:850}.builder-ko{min-height:42px;margin:0;color:var(--muted);font-size:13px;line-height:1.55}.builder-answer,.word-bank{display:flex;flex-wrap:wrap;align-content:flex-start;gap:7px;min-height:76px;margin-top:12px;border-radius:13px;padding:11px}.builder-answer{border:2px dashed #cabfb0;background:#fff}.word-bank{border:1px solid var(--line);background:var(--cream)}.word-chip{position:relative;border:1px solid #c9d2dc;border-radius:9px;background:#fff;padding:8px 10px;color:var(--navy);font-weight:800;line-height:1.15;box-shadow:0 2px 0 rgba(18,41,68,.08)}.word-chip:hover,.word-chip:focus-visible{border-color:var(--coral);outline:2px solid rgba(235,106,77,.15)}.word-chip.chosen{border-color:rgba(235,106,77,.5);background:#fff1eb;color:#9d3e2c}.word-chip small{display:none}.builder-placeholder{align-self:center;color:#8b8b86;font-size:12px}.builder-hint{margin:9px 0 0;color:var(--navy);font-size:12px}.builder-feedback{min-height:35px;margin:8px 0 0;color:#9d3e2c;font-size:12px;font-weight:800;line-height:1.45}.builder-feedback.success{color:#237b63}.builder-actions{display:grid;grid-template-columns:36px 1fr 1fr 1.2fr 40px 36px;gap:6px}.builder-actions button{min-height:36px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--navy);font-size:11px;font-weight:850}.builder-actions button:first-child,.builder-actions button:last-child{font-size:21px}.builder-actions button:disabled{cursor:not-allowed;opacity:.35}.builder-actions .builder-check{border-color:var(--navy);background:var(--navy);color:#fff}
.builder-backspace{display:block;margin:6px 0 0 auto;border:0;background:transparent;color:var(--coral);font-size:11px;font-weight:850}.builder-backspace small{margin-left:4px;color:var(--muted);font-size:9px}.builder-backspace:disabled{cursor:not-allowed;opacity:.35}
.brand>img{display:block;width:44px;height:44px;object-fit:contain}
.lesson-strip{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:6px}.nav-scroll{display:grid;width:32px;height:32px;place-items:center;border:1px solid var(--line);border-radius:50%;background:var(--navy);color:#fff;font-size:22px;font-weight:900;line-height:1;cursor:pointer}.lesson-buttons{min-width:0;scroll-behavior:smooth;overscroll-behavior-x:contain;touch-action:pan-x}.lesson-buttons::-webkit-scrollbar,.ranges::-webkit-scrollbar{display:none}
@media(max-width:760px){.section-heading{align-items:flex-start;flex-direction:column}.section-heading .source-actions{margin-top:6px}}
@media(max-width:980px){.practice-layout{grid-template-columns:1fr}.sentence-builder{position:static;min-height:0}.builder-actions{grid-template-columns:36px repeat(3,1fr) 40px 36px}}
@media(max-width:560px){.builder-actions{grid-template-columns:36px 1fr 1fr 36px}.builder-actions .builder-check{grid-column:2/4}.builder-actions button[data-speak]{grid-column:1}.builder-actions button[data-builder-action="next"]{grid-column:4}.sentence-builder{padding:15px}.builder-answer,.word-bank{min-height:70px}.word-chip{padding:8px}}
.grammar-card{grid-column:auto}.grammar-guide{display:grid;gap:18px;margin-top:18px}.grammar-guide h3{margin:2px 0 -7px;color:var(--navy);font-size:16px}.korean-note{border-left:4px solid var(--mint);border-radius:0 13px 13px 0;background:var(--mint-soft);padding:14px 16px}.korean-note b{color:var(--navy);font-size:13px}.korean-note p{margin:6px 0 0;line-height:1.65}.form-list,.mistake-list{display:grid;gap:9px}.form-row,.mistake-row{border:1px solid var(--line);border-radius:13px;background:#fff;padding:13px}.form-row>div{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:baseline}.form-row>div b{color:var(--coral);font-size:15px}.form-row>div span{color:var(--muted);font-size:13px}.form-row>p{margin:9px 0 0;line-height:1.55}.form-row mark{background:transparent;color:var(--coral)}.mistake-row p{display:grid;gap:5px;margin:0 0 7px}.wrong{color:#a84a3a;text-decoration:line-through}.right{color:#237b63;font-weight:850}.mistake-row small{color:var(--muted);line-height:1.5}.grammar-sources{display:flex;flex-wrap:wrap;gap:7px;align-items:center;border-top:1px solid var(--line);padding-top:14px}.grammar-sources b{margin-right:4px;color:var(--muted);font-size:12px}.grammar-sources a{border-radius:99px;background:var(--cream);padding:6px 9px;color:var(--navy);font-size:11px;font-weight:800;text-decoration:none}
.gloss-term{cursor:help;border-bottom:2px dotted var(--coral);color:inherit;text-decoration:none}.gloss-term:hover,.gloss-term:focus-visible{border-bottom-style:solid;color:var(--coral);outline:0}.hero-main .gloss-term:hover,.hero-main .gloss-term:focus-visible{color:var(--sun)}.gloss-bubble{position:fixed;z-index:100;max-width:min(300px,calc(100vw - 20px));border-radius:10px;background:var(--navy);padding:9px 12px;color:#fff;font-size:13px;font-weight:800;line-height:1.45;box-shadow:0 8px 24px rgba(18,41,68,.25);pointer-events:none}.gloss-bubble[hidden]{display:none}