:root{--ink:#253d38;--muted:#65756f;--berry:#952b40;--berry-dark:#752033;--leaf:#32765e;--line:#dce4df;--paper:#fff;--base:#f5f7f6;--blue:#e7eefb;--peach:#fce7da;--green:#eef3df;font-family:'Malgun Gothic','Apple SD Gothic Neo',sans-serif;color:var(--ink);background:var(--base);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;font-size:16px;line-height:1.7}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button{color:inherit}button:not(:disabled):active,.button:active{transform:translateY(1px)}:focus-visible{outline:3px solid #2d719b;outline-offset:4px}h1,h2,h3,p{margin:0}h1{font-size:36px;line-height:1.35;letter-spacing:-1.5px;word-break:keep-all}h2{font-size:23px;line-height:1.45;letter-spacing:-.7px}h3{font-size:19px;line-height:1.5;letter-spacing:-.4px}p{word-break:keep-all;overflow-wrap:anywhere}small{font-size:13px}button{border:0;background:transparent}a,button{ -webkit-tap-highlight-color:transparent}hr{border:0;border-top:1px solid var(--line);margin:26px 0}.shell{display:grid;grid-template-columns:224px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:var(--paper);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:30px 20px}.brand{display:flex;flex-direction:column;align-items:center;gap:10px}.brand img{width:135px;height:84px;object-fit:contain}.brand>span{font-size:27px;font-weight:800;letter-spacing:-1px}.brand-note{text-align:center;color:var(--muted);font-size:12px;margin:2px 0 36px}.sidebar nav{display:grid;gap:7px}.sidebar nav a{display:flex;align-items:center;gap:11px;padding:12px 10px;border-radius:9px;font-size:14px;font-weight:600;min-height:48px}.sidebar nav a>span{width:22px;text-align:center;font-size:20px;font-weight:400;line-height:1}.sidebar nav a:hover{background:#f6f8f6}.sidebar nav a.active{background:#f8edf0;color:var(--berry)}.sidebar nav b{margin-left:auto;font-size:11px;background:#eee2e5;border-radius:20px;min-width:22px;text-align:center}.sidebar-bottom{margin-top:auto;display:flex;flex-direction:column;gap:14px;font-size:12px;color:var(--muted);padding:30px 10px 0}.sidebar-bottom a{text-decoration:underline;text-underline-offset:4px}.sidebar-bottom small{font-size:11px}.workspace{min-width:0}.topbar{height:74px;padding:0 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#ffffffb0;gap:14px}.top-label{font-size:13px;color:var(--muted)}.mobile-brand,.mobile-nav{display:none}.text-button{font-size:13px;text-decoration:underline;text-underline-offset:4px;min-height:44px;padding:8px 0;font-weight:600}.topbar .text-button{color:var(--leaf)}main{max-width:1240px;margin:0 auto;padding:44px 48px 64px;min-height:calc(100vh - 160px)}main:focus{outline:none}.kicker{color:var(--berry);font-size:14px;font-weight:700;margin-bottom:13px}.welcome{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;padding:22px 0 42px}.welcome h1{font-size:clamp(34px,3.5vw,49px);line-height:1.35;letter-spacing:-2px}.welcome>div>p:not(.kicker){margin-top:20px;font-size:16px;color:var(--muted);line-height:1.8}.actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.welcome .actions{margin-top:30px;gap:10px}.button{display:inline-flex;min-height:48px;justify-content:center;align-items:center;background:var(--berry);color:white;border:1px solid var(--berry);border-radius:8px;padding:12px 21px;font-size:14px;font-weight:700;text-align:center;line-height:1.5}.button:hover{background:var(--berry-dark)}.button.secondary{background:white;color:var(--ink);border-color:#cbd7d0}.button.secondary:hover{background:#f0f5f1}.button.danger{background:#a52131}.welcome small{display:block;color:var(--muted);font-size:11px;margin-top:13px}.sentence-paper{background:#fff;border:1px solid #dce5de;border-radius:10px 10px 44px 10px;padding:24px 28px;position:relative;box-shadow:7px 8px 0 #e4ece5;min-height:328px}.paper-top{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted)}.demo-sentence{display:flex;gap:9px;justify-content:center;margin-top:18px}.demo-sentence>span{font-family:Georgia,serif;font-size:36px;line-height:1.3;padding:14px 15px 12px;border-radius:8px;text-align:center;white-space:nowrap}.subject{background:var(--blue)}.verb{background:var(--peach)}.rest{background:var(--green)}.demo-sentence small{font-family:'Malgun Gothic',sans-serif;font-size:11px;color:#52645c;display:block;font-weight:400;margin-top:10px}.translation{text-align:center;font-size:15px;margin-top:14px!important;color:var(--ink)!important}.paper-line{height:1px;background:var(--line);margin:22px 0 17px}.paper-note{font-size:13px!important;line-height:1.8;color:var(--muted);margin:0!important}.listen{display:inline-flex;align-items:center;gap:7px;min-height:44px;color:var(--leaf);font-size:13px;font-weight:600;padding:9px 0}.sentence-paper>.listen{position:absolute;right:28px;bottom:22px}.today-strip{display:grid;grid-template-columns:1fr 1fr 1fr auto;align-items:center;gap:16px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.today-strip>div{border-right:1px solid var(--line)}.today-strip>div:nth-child(3){border:0}.today-strip span{display:block;color:var(--muted);font-size:12px}.today-strip strong{display:block;font-size:25px;font-weight:700;margin-top:4px;line-height:1.5}.today-strip strong small{font-size:12px;font-weight:400;color:var(--muted)}.plain-link{font-size:13px;font-weight:600;text-decoration:underline;text-underline-offset:5px;display:inline-block;padding:10px 0;min-height:44px}.section-block{margin-top:42px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px}.section-head p{font-size:14px;color:var(--muted);margin-top:7px}.course-overview{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line);background:white}.group-row{display:flex;align-items:flex-start;gap:20px;padding:24px;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}.group-row:hover{background:#f8faf8}.group-number{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:37px;height:37px;background:#e7f0e9;border-radius:50%;font:20px Georgia,serif;color:var(--leaf)}.berry .group-number,.group-number.berry{background:#f8e8eb;color:var(--berry)}.blue .group-number,.group-number.blue{background:#e7eefb;color:#47628d}.sand .group-number,.group-number.sand{background:#f9eed8;color:#89672a}.group-row p{font-size:13px;color:var(--muted);margin:5px 0}.group-row small{font-size:11px;color:var(--muted)}.row-arrow{margin-left:auto;color:var(--muted);font-size:22px}.practice-banner{background:#eaf1eb;display:flex;justify-content:space-between;align-items:center;padding:28px 30px;margin-top:32px;gap:24px;border-radius:10px}.practice-banner h2{font-size:21px}.practice-banner p{color:var(--muted);font-size:14px;margin-top:6px}.small-tag{font-size:12px;color:var(--leaf);display:block;margin-bottom:5px}.local-note{font-size:12px;color:var(--muted);text-align:center;margin-top:25px}.footer{padding:24px 48px;border-top:1px solid var(--line);color:var(--muted);font-size:11px;display:flex;justify-content:space-between;gap:15px}.footer a{text-decoration:underline}.page-heading{margin-bottom:34px}.page-heading>p:last-child:not(.kicker){color:var(--muted);font-size:16px;margin-top:14px;max-width:720px}.unit-group{margin:36px 0 45px}.group-heading{display:flex;gap:15px;align-items:center;margin-bottom:18px}.group-heading p{font-size:13px;color:var(--muted);margin-top:3px}.lesson-list{background:white;border-top:1px solid var(--line)}.lesson-row{display:flex;align-items:center;gap:22px;padding:21px 24px;border-bottom:1px solid var(--line)}.lesson-row:hover{background:#f2f6f2}.lesson-num{font:22px Georgia,serif;color:#7d8b84}.lesson-row h3{font-size:18px}.lesson-row p{font-size:13px;color:var(--muted)}.lesson-meta{margin-left:auto;text-align:right;display:flex;flex-direction:column;gap:5px;font-size:12px;flex-shrink:0}.lesson-meta small{font-size:11px;color:var(--muted)}.done-badge{color:var(--leaf);font-weight:600}.started-badge{color:var(--berry);font-weight:600}.back-link{display:inline-flex;align-items:center;min-height:44px;font-size:13px;color:var(--muted);margin-bottom:20px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 215px;gap:28px}.lesson-sheet{padding:34px;background:white;border:1px solid var(--line);border-radius:10px}.formula{display:flex;gap:9px;align-items:stretch;margin-bottom:34px;flex-wrap:wrap}.formula>div{border-radius:7px;padding:15px 17px;flex:1;text-align:center}.formula>div>span{font:24px/1.5 Georgia,serif;white-space:normal}.formula small{display:block;color:#516058;font-size:11px;margin-top:8px}.rule-copy{display:grid;gap:21px}.rule-copy p{position:relative;padding-left:31px;font-size:16px;line-height:1.9}.rule-dot{position:absolute;left:0;top:5px;display:flex;align-items:center;justify-content:center;width:21px;height:21px;font:12px Georgia,serif;background:#f0f4ee;border-radius:50%;color:var(--leaf)}.subheading{font-size:18px;margin:34px 0 10px}.example{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:16px 0;gap:18px}.example p{font:23px/1.6 Georgia,serif;color:var(--ink)}.example span{font-size:13px;color:var(--muted)}.round-button{border:1px solid var(--line);border-radius:50%;width:44px;height:44px;flex-shrink:0;color:var(--leaf)}.teacher-note{background:#f4f6ef;border-left:3px solid #8da17f;padding:18px 20px;margin-top:28px;font-size:14px}.teacher-note strong{font-size:13px}.teacher-note p{margin-top:5px;line-height:1.8}.lesson-end{margin-top:32px;display:flex;align-items:center;justify-content:space-between;gap:18px}.lesson-end p{font-size:14px}.lesson-end small{color:var(--muted);font-size:12px}.lesson-side{padding:10px 0;font-size:13px;color:var(--muted)}.lesson-side h2{font-size:16px;color:var(--ink)}.lesson-side ol{padding-left:20px;display:grid;gap:15px;margin:24px 0}.lesson-side .current{color:var(--berry);font-weight:700}.side-note{font-size:12px;line-height:1.9;margin-bottom:20px}.lesson-side a{text-decoration:underline;text-underline-offset:4px}.english{font:23px/1.6 Georgia,serif;color:var(--ink);margin-top:12px}.quiz-top{display:flex;gap:20px;align-items:center;justify-content:space-between;max-width:790px;margin:auto;font-size:13px}.quiz-top .back-link{margin:0}.quiz-top>strong{white-space:nowrap}.progress-track{height:6px;background:#e0e8e1;max-width:790px;margin:16px auto 30px;border-radius:8px}.progress-track>div{height:100%;background:var(--leaf);width:var(--progress);border-radius:8px;transition:width .2s}.quiz-paper{max-width:790px;margin:auto;background:white;border:1px solid var(--line);padding:36px 44px;border-radius:12px}.question-type{font-size:13px;color:var(--leaf);font-weight:600;margin-bottom:18px}.question{font-size:27px;letter-spacing:-.7px;line-height:1.6;margin-bottom:28px}.choices{display:grid;gap:12px}.choice{display:flex;align-items:center;text-align:left;gap:16px;padding:17px 20px;border:1.5px solid var(--line);border-radius:8px;background:#fff;min-height:66px;line-height:1.6;font-size:17px}.choice-letter{display:flex;width:28px;height:28px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:5px;font:15px Georgia,serif;flex-shrink:0;color:var(--muted)}.choice b{margin-left:auto;color:var(--leaf)}.choice:hover:not(:disabled){background:#f4f7f3;border-color:#96b49f}.choice.selected{border-color:var(--berry);background:#faf0f2}.choice.selected .choice-letter{color:var(--berry);border-color:var(--berry)}.choice:disabled{opacity:1;color:var(--muted)}.choice.correct-option{border-color:var(--leaf);background:#edf5ee;color:var(--ink)}.answer-input{width:100%;min-height:65px;padding:15px 20px;font-size:23px;border:2px solid #b7c8bc;background:#fbfcfa;color:var(--ink);border-radius:7px}.input-note{font-size:12px;color:var(--muted);margin-top:12px}.sentence-answer{background:#f6f8f6;border:1px dashed #9fb6a8;padding:18px;border-radius:8px;min-height:120px}.selected-tokens{display:flex;gap:8px;flex-wrap:wrap;min-height:50px;align-items:center}.empty-answer{font-size:14px;color:var(--muted)}.sentence-answer .text-button{margin-top:6px;font-size:12px}.word-pool{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.word-token{background:white;border:1px solid #c8d7cc;border-bottom:3px solid #acbfb1;border-radius:7px;min-height:49px;padding:9px 17px;font:21px/1.4 Georgia,serif;transition:background .15s}.word-token:hover:not(:disabled){background:#edf3ec}.word-token.placed{background:#e9f1e5;border-color:#a7b99b}.word-token.used{opacity:.25}.word-token.placed:disabled{opacity:1}.quiz-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid var(--line);padding-top:25px;margin-top:30px}.quiz-bottom>span{color:var(--muted);font-size:12px}.quiz-bottom .button{min-width:140px}.feedback{padding:20px 22px;border-radius:8px;margin-top:25px;line-height:1.8;font-size:14px}.feedback.positive{background:#edf5ec;border-left:3px solid var(--leaf)}.feedback.corrective{background:#fff3e3;border-left:3px solid #ab791f}.feedback>strong{font-size:17px;display:block;margin-bottom:8px}.feedback p{margin-top:7px}.feedback .answer-line{font-size:13px}.feedback .answer-line b{font-size:17px;margin-left:8px}.feedback a{display:inline-block;font-size:12px;margin-top:9px;text-decoration:underline;min-height:30px}.your-answer{color:var(--muted);font-size:13px}.result{text-align:center;max-width:790px;margin:10px auto 0;background:white;padding:34px;border:1px solid var(--line);border-radius:12px}.result>.kicker{margin-top:10px}.result h1{font-size:30px}.result-score{font:64px Georgia,serif;margin:20px 0 8px;color:var(--leaf)}.result-score span{font:15px 'Malgun Gothic',sans-serif;color:var(--muted)}.result>p{color:var(--muted);font-size:15px}.result .actions{justify-content:center;margin-top:30px}.recommendation{background:#edf3ed;padding:23px;margin-top:25px;border-radius:8px}.recommendation span{font-size:12px;color:var(--leaf)}.recommendation h2{margin:7px 0}.recommendation p{font-size:14px;margin-bottom:18px}.result-review{max-width:790px;margin:35px auto}.result-review h2{font-size:20px;margin-bottom:16px}.result-review article{border-top:1px solid var(--line);padding:20px 0}.result-review article>span{display:block;font-size:14px}.result-review strong{display:block;font-size:18px;margin:5px 0}.result-review p{font-size:13px;color:var(--muted)}.review-summary{display:grid;gap:16px}.review-summary section{display:flex;align-items:center;gap:22px;background:white;border:1px solid var(--line);padding:25px;border-radius:9px}.review-summary h2{font-size:20px}.review-summary p{font-size:13px;color:var(--muted);margin-top:5px}.review-summary .button{margin-left:auto;flex-shrink:0}.review-symbol{font-size:33px;color:var(--leaf);width:38px;text-align:center}.empty-state{padding:46px 25px;text-align:center;background:white;border:1px solid var(--line);border-radius:10px;margin:30px 0}.empty-state h2{margin:13px 0 8px}.empty-state p{color:var(--muted);font-size:14px;max-width:440px;margin:0 auto 24px}.review-list{background:white;margin-top:20px}.review-list>a{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px;border-bottom:1px solid var(--line)}.review-list small{color:var(--muted);font-size:12px}.review-list p{font-size:15px;margin-top:5px}.review-list>a>span{white-space:nowrap;font-size:12px;color:var(--leaf)}.word-tools{display:flex;align-items:center;flex-wrap:wrap;gap:10px 16px}.word-tools>label{font-size:13px}.word-tools input{border:1px solid #bdccc1;border-radius:6px;background:white;min-height:46px;padding:10px 15px;width:280px;max-width:100%}.filters{display:flex;flex-wrap:wrap;gap:8px;width:100%;margin-top:6px}.chip{border:1px solid var(--line);border-radius:20px;padding:9px 16px;min-height:44px;font-size:13px;background:white}.chip.active{background:var(--ink);color:white;border-color:var(--ink)}.flashcard-area{max-width:600px;margin:36px auto}.flashcard{background:#fff;border:1px solid #d3dfd5;border-radius:12px 12px 36px 12px;box-shadow:6px 7px 0 #e3ebe4;min-height:290px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px;cursor:pointer}.flashcard small{color:var(--muted);font-size:12px}.flashcard strong{font:53px/1.5 Georgia,serif;margin:15px 0 10px;overflow-wrap:anywhere;max-width:100%}.flashcard p{font-size:19px;min-height:36px}.flashcard>span{font-size:12px;color:var(--leaf);margin-top:20px}.flashcard-actions{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:27px}.word-table{border-top:1px solid var(--line);padding-top:15px;max-width:800px;margin:auto}.word-table summary{padding:12px 0;cursor:pointer;font-size:14px}.word-table dl{display:grid;grid-template-columns:1fr 1fr;gap:0 32px}.word-table dl>div{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:12px 0;gap:15px;font-size:14px}.word-table dd{color:var(--muted);margin:0}.progress-stats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;gap:20px}.progress-stats>div{border-right:1px solid var(--line);padding:0 15px}.progress-stats>div:last-child{border:0}.progress-stats span{color:var(--muted);font-size:13px;display:block}.progress-stats strong{font-size:36px;display:block;margin-top:5px}.progress-stats small{color:var(--muted);font-size:14px;font-weight:400}.activity{margin-top:32px;background:#fff;padding:26px 30px;border:1px solid var(--line);border-radius:8px}.activity h2{font-size:19px}.week{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;text-align:center;margin-top:20px}.week>div{display:flex;flex-direction:column;align-items:center;gap:7px}.week span,.week small{font-size:12px;color:var(--muted)}.week b{display:flex;align-items:center;justify-content:center;background:#f3f6f2;border:1px solid var(--line);border-radius:50%;width:40px;height:40px;font-size:14px;color:#6e7e71}.week b.studied{background:var(--leaf);color:white}.progress-lessons{display:grid;grid-template-columns:1fr 1fr;gap:0 28px}.progress-lessons>a{display:flex;align-items:center;gap:14px;padding:17px 0;border-bottom:1px solid var(--line);font-size:14px}.progress-lessons>a>span{font:16px Georgia,serif;color:var(--muted)}.progress-lessons>a>div{flex:1}.progress-lessons>a>small{font-size:11px;color:var(--muted);white-space:nowrap}.progress-lessons strong{font-size:14px;font-weight:500}.mini-track{height:3px;background:#e0e7e0;margin-top:10px}.mini-track>div{height:100%;width:var(--progress);background:var(--leaf)}.data-panel{padding:25px 28px;background:white;border:1px solid var(--line);border-radius:8px;margin-top:38px}.data-panel h2{font-size:19px}.data-panel>p{font-size:13px;color:var(--muted);margin:12px 0 20px}.data-panel>small{font-size:12px;display:block;margin-top:15px;color:var(--muted)}.file-button{cursor:pointer;position:relative}.file-button input{position:absolute;opacity:0;inset:0;width:100%;height:100%;cursor:pointer}.file-button:focus-within{outline:3px solid #2d719b;outline-offset:4px}.danger-text{color:var(--berry);margin-left:auto}.guide-copy{background:white;border:1px solid var(--line);border-radius:8px;padding:34px 42px;max-width:870px;line-height:1.9}.guide-copy h2{font-size:21px;margin:35px 0 12px}.guide-copy h2:first-child{margin-top:0}.guide-copy p{font-size:15px;color:#53675c;margin:10px 0}.guide-copy ol,.guide-copy ul{padding-left:22px;font-size:15px}.guide-copy li{margin:10px 0}.guide-copy a{color:var(--leaf);text-decoration:underline;text-underline-offset:4px}.source-list p{font-size:13px}.guide-copy .version{font-size:12px;border-top:1px solid var(--line);margin-top:30px;padding-top:20px}.notice{background:#fff0db;border-bottom:1px solid #e3c99f;padding:13px 28px;color:#72521e;font-size:13px}#toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:#253d38;color:white;box-shadow:0 5px 20px #0002;padding:15px 24px;border-radius:8px;z-index:100;max-width:min(550px,calc(100% - 32px));font-size:14px;opacity:0;pointer-events:none;transition:opacity .15s}#toast.show{opacity:1}dialog{border:1px solid var(--line);border-radius:12px;padding:30px;max-width:490px;width:calc(100% - 32px);color:var(--ink)}dialog::backdrop{background:#17332466}dialog h2{font-size:22px}dialog p{font-size:14px;color:var(--muted);margin:15px 0 25px}.skip{position:fixed;left:15px;top:-70px;background:var(--ink);color:white;z-index:200;padding:10px 20px;border-radius:5px}.skip:focus{top:12px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@media(min-width:1500px){main{padding-top:52px}.welcome{gap:65px}.sentence-paper{padding:30px 38px}.demo-sentence>span{font-size:40px;padding:17px 20px}}
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