:root{--bg:#f6f5f0;--paper:#fffefa;--ink:#252d29;--muted:#616a64;--accent:#315c49;--soft:#e7eee7;--line:#dedfd7;--warm:#95633e;--display:'Noto Serif KR',serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font-family:Pretendard,system-ui,sans-serif;font-size:16px;line-height:1.6}body[data-theme=studio]{--bg:#f3f5f7;--paper:#fff;--ink:#242c3c;--muted:#5f6879;--accent:#345a88;--soft:#e6ecf5;--line:#dce1e9;--display:Pretendard,sans-serif}body[data-theme=room]{--bg:#fbf5ef;--paper:#fffdfa;--ink:#392f29;--muted:#726458;--accent:#8e4c33;--soft:#f2e6dd;--line:#e9dbcf;--display:Pretendard,sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}a{color:var(--accent)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid 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h3{font-size:14px;font-weight:600;margin:4px 0 18px}.audio-card{border-top:1px solid var(--line);padding:20px 0}.audio-card h4{margin:8px 0;font-size:17px;letter-spacing:-.4px}.audio-card p{font-size:13px;color:var(--muted);margin:7px 0 10px}.sound{display:flex;align-items:center;gap:3px;height:25px;margin-bottom:15px}.sound i{width:3px;background:#a8b69f;border-radius:2px}.recent-note{padding:20px;background:#edece4;border-radius:4px;margin-top:15px}.recent-note p{font-size:14px;margin:9px 0}.section-title{display:flex;align-items:center;justify-content:space-between;margin:34px 0 17px}.section-title h2{font-size:18px;margin:0;font-weight:650;letter-spacing:-.5px}.shelves{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.shelf{background:var(--paper);padding:20px;border:1px solid var(--line);border-left:3px solid #819b80;border-radius:3px;text-align:left;min-width:0}.shelf:nth-child(2){border-left-color:#b2946f}.shelf:nth-child(3){border-left-color:#879dad}.shelf 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@media(min-width:1500px){.workspace{padding-inline:64px}}@media(max-width:1100px){.shell{grid-template-columns:190px minmax(0,1fr)}.workspace{padding-inline:28px}.diagram{display:none}.shelves{gap:10px}.shelf{padding:15px}.home-grid{gap:24px}.lesson-grid{grid-template-columns:1fr}.note-panel{margin-top:0}}@media(max-width:760px){.lab{padding:10px 16px;align-items:flex-start;flex-direction:column;gap:7px}.lab small{display:none}.lab select{width:100%;font-size:12px}.shell{display:block;min-height:0}.sidebar{border:0;padding:23px 20px 5px;display:block}.brand{font-size:22px}.mark{height:29px;width:24px}.tagline,.nav,.side-note{display:none}.workspace{padding:15px 20px 36px}.top{margin-bottom:25px}.top .crumb{font-size:12px}.headline{font-size:28px;margin-top:8px}.sub{font-size:14px}.home-grid{grid-template-columns:1fr;gap:26px;margin-top:24px}.art{min-height:136px;padding:23px}.art strong{font-size:25px}.diagram{display:flex;font-size:9px;gap:4px}.diagram span{padding:8px 5px}.resume-body{padding:20px}.resume h2{font-size:19px}.resume-action{gap:10px}.resume-action .btn{font-size:13px;padding:10px 13px}.secondary{display:grid;grid-template-columns:1fr}.secondary h3{margin:0 0 5px}.recent-note{display:none}.audio-card{padding:17px 0 0}.sound{display:none}.audio-card .btn{margin-top:4px}.shelves{grid-template-columns:1fr}.shelf{padding:16px 18px}.shelf h3{margin:8px 0 5px}.new{margin-top:8px}.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:var(--paper);border-top:1px solid var(--line);padding:5px 12px calc(5px + env(safe-area-inset-bottom));z-index:10;justify-content:space-around}.mobile-nav button{background:transparent;border:0;font-size:13px;min-width:80px;padding:9px 12px}.mobile-nav button.active{font-weight:700;color:var(--accent);background:var(--soft);border-radius:5px}.explain{padding:35px 22px 90px}.brief-grid{grid-template-columns:1fr;gap:0}.explain h2{font-size:25px}.lesson-grid{display:block}.video-placeholder{margin-inline:-20px;width:calc(100% + 40px);aspect-ratio:16/9;min-height:220px}.lesson-head{font-size:21px}.list-row{gap:10px;align-items:flex-start}.list-row .btn{font-size:12px;padding:8px}.note-panel{padding:18px}.eyebrow{font-size:10px}.filters{gap:7px}.filters button{padding:7px 12px}.resume-action small{font-size:12px}}
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@media(prefers-reduced-motion:no-preference){button{transition:background .15s ease,color .15s ease}button:hover{filter:brightness(.97)}}
a.brand{text-decoration:none}.nav{margin-top:35px}.nav a{display:flex;gap:14px;align-items:center;padding:11px 15px;min-height:46px;color:var(--ink);text-decoration:none;border-radius:6px}.nav a.active{background:var(--soft);color:var(--accent);font-weight:700}.sidebar{gap:0;position:sticky;top:0;height:100dvh}.sidebar .tagline{margin-bottom:0}.side-note a{display:block;margin-top:20px;font-size:12px}.side-note small{display:block;margin-top:15px}.mobile-nav a{display:block;text-align:center;text-decoration:none;min-height:44px;min-width:80px;padding:10px 16px;color:var(--muted);font-size:13px}.mobile-nav a.active{color:var(--accent);background:var(--soft);border-radius:5px;font-weight:700}.skip{position:fixed;top:-100px;left:10px;z-index:100;background:var(--paper);padding:10px}.skip:focus{top:10px}.empty{padding:38px 24px;background:var(--paper);border:1px solid var(--line);border-radius:8px;color:var(--muted)}.empty h2{color:var(--ink);font-size:20px}.empty p{margin-bottom:20px}.thumbnail{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;background:var(--soft)}.resume-thumb{width:100%;aspect-ratio:16/7;object-fit:cover;display:block}.thumb-small{width:112px;aspect-ratio:16/9;object-fit:cover;border-radius:4px;flex:none}.thumb-audio{width:112px;height:64px;background:var(--soft);display:flex;align-items:center;justify-content:center;color:var(--accent);font-size:13px;border-radius:4px;flex:none}.shelf{display:block;text-decoration:none;color:var(--ink)}.shelf h3{overflow-wrap:anywhere}.shelf-cover{width:100%;aspect-ratio:16/8;object-fit:cover;margin-bottom:14px;border-radius:2px}.shelf .badge{display:inline-block}.muted{color:var(--muted)}.notice a{color:var(--accent)}.sync-message,.warning,.error-box{background:var(--soft);padding:14px 17px;border-radius:6px;font-size:14px;margin:14px 0}.warning,.error-box{background:#f6eadb;color:#71461d}.error{color:#a2382d;font-size:14px}.error:empty{display:none}.list-row h3{overflow-wrap:anywhere}.list-row .item-link{display:flex;flex:1;align-items:center;gap:18px;text-decoration:none;color:inherit;min-width:0}.list-row .list-copy{overflow:hidden}.list-row h3{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.row-progress{height:3px;background:var(--line);max-width:180px;margin-top:9px}.row-progress span{display:block;height:100%;background:var(--accent)}.search{width:100%;max-width:440px;padding:11px 13px;border:1px solid var(--line);background:var(--paper);border-radius:6px;min-height:44px;margin:20px 0 4px}.result-count{font-size:13px;color:var(--muted)}.collection-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.collection-head h1{font-size:28px}.collection-head .actions{flex:none}.statusline{display:flex;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:13px}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px}.dialog-head h2{margin:0;font-size:22px}dialog textarea{width:100%;min-height:170px;padding:12px;border:1px solid var(--line);background:var(--bg);border-radius:4px;resize:vertical}dialog .check{display:flex;gap:9px;align-items:flex-start;font-size:13px;margin:12px 0}dialog .check input{width:18px;height:18px;flex:none;margin:3px 0}dialog input[type=url]{font-size:16px}.preview{padding:14px;background:var(--soft);border-radius:5px;font-size:14px;overflow-wrap:anywhere}.note-entry .note-text{white-space:pre-wrap;overflow-wrap:anywhere}.note-actions{display:flex;gap:12px;flex-wrap:wrap}.note-actions .btn{font-size:12px;min-height:44px;padding:4px 7px}.stamp.btn{border:0;background:var(--soft);padding:5px 10px;min-height:40px}.note-empty{font-size:14px;color:var(--muted);padding:20px 0}.player-host{width:100%;aspect-ratio:16/9;min-height:200px;background:#222c25}.player-host iframe{display:block;width:100%;height:100%;min-height:200px;border:0}.audio-host{padding:34px 26px;background:var(--soft);border-radius:6px}.audio-host h2{font-family:var(--display);font-weight:500;font-size:25px;line-height:1.5}.audio-host audio{width:100%;margin-top:20px}.audio-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:14px}.audio-tools select{border:1px solid var(--line);padding:8px;border-radius:4px;min-height:44px;background:var(--paper)}.lesson-grid{align-items:start}.lesson-main{min-width:0}.note-panel{position:sticky;top:24px;max-height:calc(100dvh - 50px);overflow:auto}.lesson-head{overflow-wrap:anywhere}.lesson-tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);margin-top:25px}.lesson-tabs button{border:0;background:transparent;padding:12px 16px}.lesson-tabs button.active{color:var(--accent);border-bottom:2px solid var(--accent);font-weight:600}.lesson-next h2{font-size:17px;margin-top:30px}.home-intro{margin-bottom:28px}.record-card{padding:23px 0;border-bottom:1px solid var(--line)}.record-card p{white-space:pre-wrap;overflow-wrap:anywhere}.record-card h3{font-size:14px;color:var(--muted);font-weight:500}.player-status{min-height:24px;font-size:13px;color:var(--muted);margin:12px 0}.progress-status{font-size:12px;color:var(--muted)}.note-panel-heading{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:14px}.note-panel-heading h3{margin:0}.collection-thumb{max-width:180px}.button-row{display:flex;gap:8px;flex-wrap:wrap}.page-more{margin:25px auto;display:block}.count{color:var(--muted);font-size:13px}.brand{width:max-content}.btn:disabled{opacity:.55;cursor:wait}.offline{border-bottom:1px solid var(--line);padding:8px 0;color:#8a4d22;font-size:13px}.focus-back{margin-bottom:22px}.notice-block{padding-top:12px}.art strong{overflow-wrap:anywhere}.home-grid{margin-top:0}.shelves:empty{display:none}
@media(max-width:1100px){.note-panel{position:static;max-height:none}.lesson-grid{grid-template-columns:minmax(0,1fr)}.collection-head{display:block}}@media(max-width:760px){.sidebar{position:static;height:auto}.sidebar .tagline{display:none}.workspace{padding-bottom:95px}.shell{min-height:100dvh}.side-note{display:none}.nav{display:none}.collection-head h1{font-size:25px}.list-row .item-link{gap:12px}.thumb-small,.thumb-audio{width:88px;height:55px}.list-row .list-copy h3{font-size:15px}.list-row .list-copy p{font-size:12px}.list-row{gap:8px}.number{min-width:22px;font-size:12px}.home-intro .headline{font-size:26px}.resume-thumb{aspect-ratio:16/7}.player-host{width:calc(100% + 40px);margin-inline:-20px;aspect-ratio:16/9;min-height:220px}.player-host iframe{min-height:220px}.note-panel{margin-top:24px}.audio-host{padding:23px 18px}.audio-host h2{font-size:23px}.collection-head .actions{margin-top:14px}.record-card .btn{font-size:12px}.shelf-cover{display:none}.headline{overflow-wrap:anywhere}.top{margin-top:7px;margin-bottom:25px}.mobile-nav{padding-bottom:calc(5px + env(safe-area-inset-bottom))}.note-panel .note-actions .btn{min-height:44px}.list-row .btn{flex:none}.home-grid .secondary .audio-card:first-of-type{border-top:1px solid var(--line)}.resume-body .meta{font-size:11px}.resume h2{font-size:19px}.paper-note{font-size:12px}.lesson-head{font-size:21px}.section-title{margin-top:28px}}
.sr-label{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.list-row .item-link:focus-visible,.shelf:focus-visible{outline:3px solid #b97830;outline-offset:4px}