@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700;800&family=Noto+Serif+KR:wght@500;600;700&display=swap');
:root{--bg:#f8f7f3;--paper:#fff;--ink:#302d34;--muted:#78757d;--line:#e9e6e0;--purple:#66527d;--lav:#ece6f4;--green:#588775;--orange:#cf7546;--serif:'Noto Serif KR',serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:'Noto Sans KR',sans-serif;font-size:14px;line-height:1.7}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}a{color:inherit;text-decoration:none}button{border:0;background:none;color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #b392d4;outline-offset:4px}button,.button{transition:background .15s,transform .15s}button:hover:not(:disabled){filter:brightness(.96)}.skip{position:fixed;top:-80px;left:20px;padding:12px;background:white;z-index:100}.skip:focus{top:10px}.shell{max-width:1680px;margin:auto;display:grid;grid-template-columns:236px minmax(0,1fr);min-height:100vh}.sidebar{border-right:1px solid var(--line);padding:38px 24px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;gap:10px;align-items:center;margin-bottom:58px}.brand-mark{width:39px;height:42px;display:grid;place-content:center;background:var(--purple);color:white;border-radius:12px;font-size:15px;line-height:1.2;transform:rotate(-5deg)}.brand-mark span{margin-left:12px;color:#f4bd91}.brand b{font-size:17px;letter-spacing:-.7px;white-space:nowrap}.brand small{display:block;font-size:10px;font-weight:400;letter-spacing:0;color:var(--muted);margin-top:3px}.nav-label{font-size:10px;color:#918c98;letter-spacing:1px;margin-left:12px}nav{display:grid;gap:9px}nav a{padding:12px;border-radius:9px;font-size:13px;display:flex;gap:13px;align-items:center}nav a span{font-size:21px;line-height:1;color:#89818e}nav a.active{background:var(--lav);color:var(--purple);font-weight:700}nav a.active span{color:var(--purple)}.sidebar-note{margin-top:auto;padding:26px 12px 0;border-top:1px solid var(--line)}.sidebar-note>span{font-size:10px;color:var(--purple)}.sidebar-note p{font-size:12px;line-height:1.9}.book-art{height:58px;display:flex;align-items:end;gap:6px;margin-top:23px}.book-art i{display:block;height:46px;width:26px;background:#ddd5e6;border-radius:3px;transform:rotate(-12deg);border-left:5px solid #c7bad6}.book-art i:nth-child(2){height:54px;transform:rotate(0);background:#dfc7ad;border-color:#ceb397}.book-art i:nth-child(3){height:42px;transform:rotate(8deg);background:#b7ccbf;border-color:#9db6a8}.home-link{font-size:10px;color:var(--muted);margin:35px 12px 0}.workspace{min-width:0;padding:0 48px}.topbar{height:92px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.account{border:1px solid var(--line);border-radius:25px;padding:8px 15px;background:#fff;color:var(--ink);font-size:12px}.account span{margin-left:12px}main{max-width:1140px;margin:45px auto 0;min-height:65vh}.eyebrow{color:var(--purple);font-size:10px;font-weight:700;letter-spacing:1.3px;text-transform:uppercase}h1{font-size:35px;line-height:1.6;letter-spacing:-1.8px;margin:10px 0 12px;font-weight:600;font-family:var(--serif)}h1 em{font-style:normal;color:var(--purple)}.intro{color:var(--muted);font-size:13px;line-height:1.9;margin:0}.heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:30px}.tiny-note{color:var(--muted);font-size:11px}.home-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(250px,1fr);gap:20px;margin-top:30px}.daily-card{background:var(--lav);padding:30px 32px;border-radius:16px;position:relative;overflow:hidden;min-height:280px;display:flex;flex-direction:column;align-items:start}.card-top{display:flex;justify-content:space-between;width:100%;align-items:center}.pill{font-size:10px;border-radius:20px;background:#fff9;padding:4px 10px;display:inline-flex;gap:4px;align-items:center}.pill.beginner{color:#486c58;background:#e9f1e9}.pill.intermediate{color:#a16a36;background:#fbeddc}.pill.advanced{color:#75618b;background:#eee8f6}.daily-card .day{font-size:10px;letter-spacing:2px;color:var(--purple)}.daily-card h2{font-family:var(--serif);font-size:26px;font-weight:600;line-height:1.65;margin:22px 0 10px;max-width:80%;letter-spacing:-.8px;z-index:1}.daily-card p{color:#7a6f85;font-size:11px;margin:0 0 26px}.daily-card .primary{margin-top:auto;z-index:1}.primary{background:var(--purple);color:#fff;padding:12px 21px;border-radius:8px;font-size:12px;font-weight:600;display:inline-block}.primary span{margin-left:18px}.daily-art{position:absolute;right:22px;bottom:28px;font-family:var(--serif);font-size:138px;line-height:1;color:#fff7;transform:rotate(-13deg);pointer-events:none}.routine-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:27px}.section-top{display:flex;align-items:center;justify-content:space-between;gap:15px}.section-top h2{font-size:15px;font-weight:600;margin:0}.text-link{font-size:11px;color:var(--muted);text-decoration:underline;text-underline-offset:4px}.routine-card .routine-count{font-size:40px;line-height:1.4;font-weight:500;letter-spacing:-2px;margin:20px 0 6px}.routine-count small{font-size:12px;color:var(--muted);letter-spacing:0;margin-left:6px}.routine-card p{color:var(--muted);font-size:11px;line-height:1.9}.week{display:flex;gap:8px;justify-content:space-between;margin-top:20px}.week span{display:grid;gap:7px;place-items:center;font-size:9px;color:#a29aa6}.week i{border-radius:50%;height:24px;width:24px;display:grid;place-items:center;background:#f0edf3;font-style:normal}.week i.done{background:#6e967f;color:white}.week i.today{box-shadow:0 0 0 2px #cabbd9}.section{margin-top:38px}.section>.section-top{margin-bottom:17px}.level-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.level{border:1px solid var(--line);border-radius:12px;background:#fff;text-align:left;padding:21px 23px;position:relative}.level .level-icon{font-size:28px;display:block;margin:8px 0 10px;color:#69947c}.level:nth-child(2) .level-icon{color:#c18f64}.level:nth-child(3) .level-icon{color:#8a76a0}.level h3{font-size:16px;margin:7px 0}.level p{font-size:11px;color:var(--muted);line-height:1.8}.level .level-bottom{display:flex;justify-content:space-between;margin-top:20px;border-top:1px solid #f0ede8;padding-top:13px;font-size:10px;color:var(--muted)}.level-bottom b{font-size:17px;font-weight:400;color:var(--ink)}.history-card{background:white;padding:25px 28px;border:1px solid var(--line);border-radius:12px}.history-card p{font-size:11px;color:var(--muted)}.heat-scroll{overflow-x:auto;padding:8px 0}.heatmap{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,12px);grid-auto-columns:12px;gap:4px;width:max-content}.heat-cell{background:#eeeee9;border-radius:3px}.heat-cell[data-count='1']{background:#c4d8c6}.heat-cell[data-count='2']{background:#90b49b}.heat-cell[data-count='3']{background:#609174}.heat-cell[data-count='4']{background:#356e50}.heat-cell.future{visibility:hidden}.heat-legend{display:flex;justify-content:end;align-items:center;gap:5px;font-size:9px;color:var(--muted);margin-top:10px}.heat-legend i{width:11px;height:11px;border-radius:2px;background:#eeeee9}.heat-legend i:last-of-type{background:#356e50}.callout{display:flex;align-items:center;gap:16px;background:#efeee7;border-radius:10px;padding:17px 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0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.row-meta{font-size:10px;color:var(--muted)}.bookmark{font-size:20px;min-width:40px;min-height:40px;border-radius:8px;color:var(--purple)}.bookmark[aria-pressed=true]{background:var(--lav)}.status{font-size:10px;white-space:nowrap}.correct{color:var(--green)}.incorrect{color:#bd7157}.pagination{display:flex;justify-content:center;gap:15px;margin:25px}.pagination button{padding:8px 14px;border:1px solid var(--line);border-radius:8px;background:white}.empty{padding:60px 25px;text-align:center;border:1px dashed #d9d2df;border-radius:12px;background:#ffffff80}.empty h2{font-family:var(--serif);font-size:23px;font-weight:500}.empty p{color:var(--muted);font-size:12px}.empty .primary{margin-top:10px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:27px 0}.stat{background:white;border:1px solid var(--line);border-radius:12px;padding:22px}.stat span{font-size:11px;color:var(--muted)}.stat b{font-size:31px;display:block;margin-top:9px;font-weight:500}.reader-head{display:flex;align-items:start;justify-content:space-between;gap:10px;margin-bottom:20px}.reader-head h1{font-size:26px;letter-spacing:-1px;margin-top:12px}.back{font-size:11px;color:var(--muted);margin-bottom:20px;display:inline-block}.reader-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:24px;align-items:start}.reading-paper{background:white;border:1px solid var(--line);border-radius:10px;padding:22px;overflow:hidden}.reading-paper img{display:block;width:100%;height:auto}.reading-paper details{border-top:1px solid var(--line);margin-top:20px;padding-top:15px;font-size:11px;color:var(--muted)}.transcript{font-size:15px;line-height:2;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--ink)}.answer-panel{position:sticky;top:20px;border:1px solid var(--line);border-radius:12px;background:#fff;padding:22px 18px}.answer-panel h2{font-size:14px;margin:0 0 8px}.answer-panel p{font-size:11px;color:var(--muted)}fieldset{border:0;padding:0;margin:18px 0}legend{font-size:11px;font-weight:600;margin-bottom:9px}.choices{display:flex;gap:5px}.choice{flex:1;position:relative;cursor:pointer}.choice input{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer}.choice span{height:35px;border:1px solid var(--line);border-radius:7px;display:grid;place-items:center;font-size:13px}.choice input:checked+span{background:var(--purple);border-color:var(--purple);color:white}.choice input:focus-visible+span{outline:3px solid #b392d4;outline-offset:2px}.choice input:disabled{cursor:default}.choice.solution span{border-color:#75a98a;box-shadow:inset 0 0 0 1px #75a98a}.result-box{padding:16px;background:#eff5ee;border-radius:8px;margin-bottom:16px}.result-box.wrong{background:#fbf0e8}.result-box b{font-size:16px;font-weight:600}.result-box p{margin-bottom:0;font-size:10px;color:#797067}.answer-line{font-size:12px;margin:10px 0}.wide{width:100%;text-align:center}.source{font-size:10px;color:var(--muted);line-height:1.8;margin-top:20px}.source a{text-decoration:underline}.reader-bottom{margin-top:20px;display:flex;gap:10px;justify-content:end}.outline{border:1px solid var(--line);border-radius:8px;padding:10px 17px;background:#fff;font-size:12px}.loading{padding:60px;text-align:center;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:18px;padding:37px;width:min(440px,calc(100% - 30px));box-shadow:0 20px 100px #30244026;color:var(--ink)}dialog::backdrop{background:#30263e5c;backdrop-filter:blur(3px)}dialog h2{font-family:var(--serif);font-size:22px;letter-spacing:-.6px}dialog>p{font-size:12px;color:var(--muted)}.close{position:absolute;right:17px;top:11px;font-size:25px}.auth-tabs{display:flex;border-bottom:1px solid var(--line);margin:24px 0}.auth-tabs button{width:50%;padding:12px;font-size:12px}.auth-tabs button[aria-pressed=true]{color:var(--purple);border-bottom:2px solid var(--purple);font-weight:700}form label{display:block;font-size:11px;margin:15px 0}form label input{display:block;width:100%;border:1px solid var(--line);border-radius:8px;padding:12px;margin-top:7px;background:#fbfaf8}.form-note{font-size:10px;color:var(--muted)}.form-error,#delete-form [role=alert]{font-size:11px;color:#a14a36;min-height:18px}.danger{color:#a14a36;border:1px solid #d3a195;padding:10px;border-radius:6px}.auth-tabs[hidden],form[hidden],[hidden]{display:none!important}#account-tools details{margin-top:30px;font-size:11px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);max-width:calc(100% - 30px);padding:12px 22px;background:#3e3548;color:white;border-radius:10px;font-size:12px;z-index:100;opacity:0;pointer-events:none}#toast.visible{opacity:1}.error-page{padding:55px 20px;text-align:center}.error-page p{color:var(--muted)}.source-page{max-width:800px;margin:auto;padding:35px 20px}.source-page h1{font-size:28px}.source-page a{text-decoration:underline}.source-page table{width:100%;border-collapse:collapse;font-size:12px}.source-page td,.source-page th{border-bottom:1px solid var(--line);padding:8px;text-align:left}
@media(min-width:1450px){.workspace{padding:0 70px}main{margin-top:52px}.daily-card{min-height:300px}.daily-card h2{font-size:30px}.level{padding:24px 28px}}
@media(max-width:1100px){.shell{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding:30px 15px}.brand b{font-size:15px}.brand-mark{width:32px}.workspace{padding:0 28px}.home-grid{grid-template-columns:minmax(0,1.4fr) minmax(220px,1fr)}.daily-card{padding:25px}.daily-card h2{font-size:23px}.level{padding:17px}.reader-layout{grid-template-columns:minmax(0,1fr) 215px;gap:15px}.reading-paper{padding:14px}}
@media(max-width:800px){.shell{display:block}.sidebar{height:auto;position:static;border-right:0;border-bottom:1px solid var(--line);padding:20px 22px 0}.brand{margin-bottom:20px}.brand b{font-size:17px}.brand-mark{width:36px}.sidebar-note,.nav-label,.home-link{display:none}nav{display:flex;gap:0;justify-content:space-between}nav a{padding:11px 9px;font-size:11px;border-radius:8px 8px 0 0;gap:6px}nav a span{font-size:17px}.workspace{padding:0 22px}.topbar{height:65px}main{margin-top:29px}.heading{margin-bottom:22px}.heading>.tiny-note{display:none}h1{font-size:29px}.home-grid{grid-template-columns:1.25fr 1fr;gap:14px}.routine-card{padding:22px}.daily-card h2{font-size:22px}.daily-card p{max-width:80%}.level-grid{gap:10px}.level{padding:16px}.level h3{font-size:14px}.level p{font-size:10px}.reader-layout{grid-template-columns:minmax(0,1fr) 220px}.reading-paper{padding:10px}.answer-panel{padding:16px 12px}}
@media(max-width:600px){body{font-size:13px}.sidebar{padding:17px 16px 0}.brand{margin-bottom:14px}.brand small{font-size:9px}nav a{font-size:10px;padding:11px 7px}nav a span{font-size:16px}.workspace{padding:0 18px}.topbar{height:62px;font-size:10px}.account{font-size:10px;padding:7px 11px}.account span{margin-left:6px}.eyebrow{font-size:9px}h1{font-size:28px;letter-spacing:-1.7px}.intro{font-size:11px;line-height:1.9}.home-grid{display:block;margin-top:24px}.daily-card{padding:25px;min-height:260px}.daily-card h2{font-size:25px}.daily-card p{font-size:11px}.daily-art{font-size:145px}.routine-card{margin-top:14px;display:grid;grid-template-columns:1fr 1fr;column-gap:14px;padding:22px}.routine-card .section-top{grid-column:1/-1}.routine-card .routine-count{font-size:30px;margin:15px 0 0}.routine-card>p{margin:7px 0}.routine-card .week{grid-column:1/-1;margin-top:15px}.section{margin-top:30px}.level-grid{display:grid;grid-template-columns:1fr}.level{display:grid;grid-template-columns:1fr 1fr;padding:19px 22px}.level .level-icon{display:none}.level>.pill{justify-self:start}.level h3{grid-column:1;margin-top:13px;font-size:17px}.level p{grid-column:2;grid-row:1/4;margin:0;align-self:center;font-size:11px;padding-left:13px}.level .level-bottom{grid-column:1/-1;margin-top:10px;padding-top:10px}.history-card{padding:20px}.callout{padding:15px}.callout p{font-size:10px}footer{gap:14px;margin-top:35px;font-size:9px}footer>span{flex-basis:100%}.problem-row{padding:15px 14px;gap:7px}.row-open h3{font-size:12px}.row-meta{font-size:9px}.status{font-size:9px}.filters{gap:7px}.filters select{flex:1;min-width:90px;padding:9px 8px;font-size:11px}.filters input{flex-basis:100%;font-size:11px}.stats{gap:8px}.stat{padding:17px 12px}.stat b{font-size:26px}.stat span{font-size:10px}.reader-head h1{font-size:22px}.reader-layout{display:block}.reading-paper{padding:12px 9px}.answer-panel{position:static;margin-top:18px;padding:23px}.answer-panel h2{font-size:16px}.choice span{height:43px}.choices{gap:9px}.reader-bottom{margin-top:15px}.reader-bottom button{flex:1}.source{font-size:10px}.empty{padding:40px 20px}dialog{padding:30px 24px}.heading{gap:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.skip{opacity:0;pointer-events:none}.skip:focus{opacity:1;pointer-events:auto}.reading-tools{display:flex;gap:8px;justify-content:end;margin:0 0 17px}.reading-tools .outline{font-size:10px;padding:6px 10px}#zoom{width:min(900px,96vw);max-width:96vw;max-height:92vh;padding:20px;overflow:auto}#zoom>p{font-size:11px;padding-right:20px}.zoom-images{overflow:auto;max-height:76vh}.zoom-images img{display:block;width:100%;min-width:680px;height:auto}.reader-head h1{word-break:keep-all}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}nav [data-nav=review]{line-height:1.7}.reading-paper img{margin-bottom:12px}.reading-paper img:last-of-type{margin-bottom:0}@media(max-width:600px){nav [data-nav=review]{font-size:9px}nav a{gap:4px;padding:11px 4px}.reader-bottom{flex-wrap:wrap}}
/* Submitted-answer statistics and discussion. */
.community{margin-top:36px;display:grid;gap:28px}.answer-stats,.discussion{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:28px}.community .section-top{gap:15px;flex-wrap:wrap;margin-bottom:16px}.community h2{font-size:18px;margin:0;font-family:var(--serif)}.community .section-top>span,.community-note{font-size:11px;color:var(--muted)}.wrong-rate{display:flex;align-items:baseline;gap:15px;flex-wrap:wrap}.wrong-rate>span{font-size:12px}.wrong-rate strong{font-size:32px;color:var(--purple);font-weight:600}.wrong-rate small{color:var(--muted);font-size:11px}.community-note{line-height:1.8}.distribution-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,330px),1fr));gap:24px;margin-top:24px}.question-distribution h3{font-size:13px;font-weight:500;margin:0 0 15px}.question-distribution h3>span{float:right;color:var(--muted);font-size:10px}.distribution{list-style:none;padding:0;margin:0;display:grid;gap:11px}.distribution li{display:grid;grid-template-columns:20px minmax(30px,1fr) 88px 57px;align-items:center;gap:8px;font-size:11px}.choice-number{font-size:16px;color:var(--muted)}.distribution-track{height:9px;border-radius:6px;overflow:hidden;background:#f1eef4}.distribution-track>span{height:100%;display:block;min-width:0;background:#b6a8c8;border-radius:6px}.is-correct .distribution-track>span{background:#729783}.is-correct .choice-number{color:var(--green)}.distribution-value{text-align:right;font-variant-numeric:tabular-nums}.distribution-value small{color:var(--muted);font-size:10px}.distribution-tag{font-size:9px;color:var(--muted)}.is-mine .distribution-value{font-weight:700;color:var(--purple)}#comment-form{margin:20px 0 8px}#comment-form>label{font-size:12px;margin-bottom:8px}#comment-body{display:block;resize:vertical;min-height:100px;max-height:350px;width:100%;border:1px solid var(--line);border-radius:9px;padding:14px;font:inherit;background:#fcfbf9;color:var(--ink)}.comment-form-bottom{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:12px}.comment-form-bottom>span{font-size:10px;color:var(--muted)}.comment-form-bottom .primary{font-size:12px;padding:10px 20px}.comment-error,#profile-form [role=alert]{color:#a14a36;font-size:11px}.comment-login{background:var(--bg);border-radius:9px;padding:16px;margin:20px 0;font-size:12px}.comment{border-top:1px solid var(--line);padding:19px 0}.comment-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12px}.comment-meta b{font-weight:500;overflow-wrap:anywhere}.comment-meta time{font-size:10px;color:var(--muted)}.comment-delete{margin-left:auto;font-size:10px;color:var(--muted);padding:5px}.mine-badge{font-size:9px;background:var(--lav);color:var(--purple);border-radius:4px;padding:0 5px}.comment>p{font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9;margin:8px 0 0}.comments-empty{font-size:12px;color:var(--muted);padding:20px 0}.more-comments{display:block;margin:10px auto 0}#profile-form{margin:20px 0 24px}#profile-form label{font-size:12px}#profile-form input{font:inherit;padding:10px;border:1px solid var(--line);border-radius:8px;width:100%;margin-top:7px}
@media(max-width:600px){.answer-stats,.discussion{padding:20px 15px}.community h2{font-size:16px}.distribution li{gap:5px;grid-template-columns:19px minmax(25px,1fr) 79px 50px}.distribution-value{font-size:10px}.community .section-top>span{font-size:10px}.wrong-rate strong{font-size:28px}}