:root{--bg:#f5f3ee;--paper:#fffefa;--ink:#26352f;--muted:#727b73;--line:#dfdfd4;--accent:#315d63;--accent-soft:#e3edeb;--warn:#a34235;--good:#236f51;--f-ui:"Malgun Gothic","Apple SD Gothic Neo",system-ui,sans-serif;--f-read:Georgia,"Times New Roman",serif;color-scheme:light;--read-size:21px}
@media(prefers-color-scheme:dark){:root{--bg:#141b19;--paper:#1d2722;--ink:#e7ede6;--muted:#a4afa3;--line:#374339;--accent:#99ccd0;--accent-soft:#263c38;--warn:#f1a593;--good:#9ed4ae;color-scheme:dark}}
*{box-sizing:border-box}html,body{margin:0;min-height:100%}body{background:var(--bg);color:var(--ink);font:15px/1.6 var(--f-ui);padding-bottom:env(safe-area-inset-bottom,0px)}button,input,textarea,select{font:inherit;color:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:3px}button,a{touch-action:manipulation}a{color:var(--accent)}[hidden]{display:none!important}
.top{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top,0px)}.top-in{max-width:840px;display:flex;align-items:center;gap:8px;margin:auto;padding:12px 20px}.brand{flex:1;min-width:0;background:none;border:0;text-align:left;font:700 22px/1.1 var(--f-read);padding:0;color:var(--accent)}.brand span{display:block;font:10px/1.6 var(--f-ui);letter-spacing:.12em;color:var(--muted);margin-top:3px}.small-btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:7px 12px;border:1px solid var(--line);border-radius:10px;background:var(--paper);text-decoration:none;font-size:13px;white-space:nowrap;color:var(--ink)}
#bookApp{max-width:840px;margin:auto;padding:24px 20px 42px;min-width:0}.eyebrow{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:700}h1{font:600 clamp(28px,6vw,40px)/1.2 var(--f-read);margin:8px 0 12px;overflow-wrap:anywhere}h2{font-size:19px;line-height:1.4;margin:0 0 10px}h3{font-size:16px;margin:0 0 8px}.intro{color:var(--muted);margin:0 0 24px}.bookshelf{display:grid;gap:16px}.book-card{display:grid;grid-template-columns:110px minmax(0,1fr);gap:20px;background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:20px;align-items:start}.book-card img{display:block;width:100%;aspect-ratio:500/684;object-fit:cover;border-radius:4px;box-shadow:0 6px 16px #0002}.book-card h2{font:600 25px/1.15 var(--f-read);margin-bottom:8px}.book-card .sub{font-size:14px}.muted{color:var(--muted);font-size:13px}.book-card p{margin:8px 0}.pill{display:inline-flex;padding:2px 8px;background:var(--accent-soft);color:var(--accent);border-radius:6px;font-size:11px;font-weight:700}.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.btn{min-height:46px;padding:10px 15px;border:1px solid var(--line);border-radius:11px;background:var(--paper);font-size:14px;font-weight:600;text-decoration:none;text-align:center;display:inline-flex;align-items:center;justify-content:center;gap:5px;color:var(--ink)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--paper)}.empty{padding:24px 16px;border:1px dashed var(--line);border-radius:14px;color:var(--muted)}.more-note{margin-top:24px;padding:16px;background:var(--accent-soft);border-radius:12px;color:var(--accent);font-size:13px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;font-size:12px;color:var(--muted);margin-bottom:12px}.breadcrumb button{background:none;border:0;padding:0;color:var(--accent);min-height:32px}.chapter-card{margin-top:20px;padding:20px;border:1px solid var(--line);border-radius:16px;background:var(--paper)}.progress{height:5px;background:var(--line);border-radius:6px;overflow:hidden;margin:12px 0}.progress i{display:block;height:100%;background:var(--accent)}.unit-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:14px}.unit-item{border:1px solid var(--line);border-radius:10px;padding:11px;text-align:left;background:var(--paper);min-width:0}.unit-item b{display:block;font-size:13px}.unit-item span{display:block;font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.unit-item.done{background:var(--accent-soft)}
.reader-title{font-size:12px;color:var(--muted);margin:0 0 10px}.reader-nav{display:grid;grid-template-columns:42px minmax(0,1fr) 42px;gap:8px;align-items:center;margin-bottom:14px}.reader-nav select{width:100%;min-width:0;border:1px solid var(--line);border-radius:10px;min-height:44px;padding:7px 10px;background:var(--paper);font-size:13px}.reader-nav button{min-height:44px;background:var(--paper);border:1px solid var(--line);border-radius:10px;font-size:18px}.view-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;padding:4px;background:var(--line);border-radius:12px;margin-bottom:16px}.view-tabs button{border:0;border-radius:8px;padding:10px 4px;background:none;color:var(--muted);font-size:13px;font-weight:600;min-height:42px}.view-tabs button[aria-selected=true]{background:var(--paper);color:var(--accent)}
.reading-controls{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:16px}.reading-controls .spacer{flex:1}.reading-controls button{min-height:40px;padding:6px 11px;background:var(--paper);border:1px solid var(--line);border-radius:8px;font-size:13px}.reading-controls button[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}.paper{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:28px 26px;min-width:0}.reading-text{font:var(--read-size)/1.9 var(--f-read);overflow-wrap:anywhere;word-break:normal}.reading-text p{margin:0 0 1em}.reading-text p:last-child{margin-bottom:0}.reading-text .word-mark{font:inherit;color:var(--accent);background:linear-gradient(transparent 68%,var(--accent-soft) 68%);border:0;border-bottom:1px solid var(--accent);padding:0 1px;line-height:inherit;text-align:left;display:inline;cursor:pointer}.translation{border-top:1px solid var(--line);margin-top:24px;padding-top:20px;font:15px/1.9 var(--f-ui);color:var(--muted);overflow-wrap:anywhere}.translation p{margin:0 0 1em}.reading-foot{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.reading-foot .btn{flex:1}.inline-note{font-size:12px;line-height:1.7;color:var(--muted);margin:12px 0}.vocab-preview{margin-top:22px}.vocab-chips{display:flex;gap:6px;flex-wrap:wrap}.vocab-chips button{border:1px solid var(--line);background:var(--paper);color:var(--accent);padding:6px 10px;border-radius:8px;font:15px/1.4 var(--f-read);min-height:36px}
.workbook-head{display:flex;align-items:center;gap:8px;justify-content:space-between;margin-bottom:14px}.exercise-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}.exercise-tabs button{border:1px solid var(--line);border-radius:8px;background:var(--paper);padding:7px 10px;min-height:40px;font-size:13px}.exercise-tabs button[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}.question-term{font:600 32px/1.25 var(--f-read);margin:14px 0 20px;overflow-wrap:anywhere}.choices{display:grid;gap:8px}.choice{display:block;width:100%;text-align:left;min-height:52px;padding:13px;border:1px solid var(--line);border-radius:10px;background:var(--paper);font-size:14px}.choice.correct{border-color:var(--good);background:var(--accent-soft)}.choice.wrong{border-color:var(--warn);color:var(--warn)}.feedback{margin:14px 0;font-size:14px;line-height:1.7;overflow-wrap:anywhere}.feedback.good{color:var(--good)}.feedback.wrong{color:var(--warn)}.cloze-text{font:22px/1.9 var(--f-read);margin:16px 0 20px;overflow-wrap:anywhere}.gap{display:inline-block;min-width:90px;border-bottom:2px solid var(--accent);line-height:1;color:var(--accent);padding:0 5px}.answer-input{display:block;width:100%;min-width:0;min-height:48px;border:1px solid var(--line);border-radius:10px;padding:12px;background:var(--bg);font-size:17px}.answer-input:focus{outline:2px solid var(--accent);outline-offset:-1px}textarea.answer-input{min-height:150px;resize:vertical;line-height:1.6}.answer-label{display:block;font-size:14px;margin:18px 0 8px}.practice-footer{display:flex;justify-content:space-between;gap:8px;margin-top:20px}.own-context{background:var(--accent-soft);border-radius:10px;padding:12px;font-size:13px;line-height:1.8;overflow-wrap:anywhere}.sentence-result{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}.sentence-result .natural{font:21px/1.7 var(--f-read);overflow-wrap:anywhere}.saved-search{margin-bottom:18px}.saved-list{display:grid;gap:12px}.saved-card{padding:16px;border:1px solid var(--line);background:var(--paper);border-radius:14px;min-width:0}.saved-card summary{font:600 24px/1.4 var(--f-read);cursor:pointer;overflow-wrap:anywhere}.saved-card details p{font-size:14px;margin:8px 0}.saved-card .source{font-size:12px;color:var(--muted);margin-top:8px}.saved-card .actions{margin-top:10px}.saved-card .btn{font-size:12px;min-height:38px;padding:6px 10px}
#wordDialog{box-sizing:border-box;width:calc(100% - 28px);max-width:480px;max-height:calc(100dvh - 40px);overflow:auto;border:1px solid var(--line);border-radius:18px;padding:22px;background:var(--paper);color:var(--ink)}#wordDialog::backdrop{background:#18251d88}#wordDialog .close{float:right;margin:-4px -4px 6px 10px}#wordDialog h2{font:600 30px/1.3 var(--f-read);clear:both;overflow-wrap:anywhere}#wordDialog .context{font:18px/1.8 var(--f-read);border-top:1px solid var(--line);padding-top:16px;overflow-wrap:anywhere}.book-toast{position:fixed;bottom:20px;left:16px;right:16px;max-width:500px;margin:auto;background:var(--ink);color:var(--paper);padding:12px 16px;border-radius:12px;z-index:40;font-size:13px;pointer-events:none}.book-toast:empty{display:none}.loading{padding:35px 0;color:var(--muted)}
@media(max-width:600px){.top-in{padding:10px 16px}.brand{font-size:20px}#bookApp{padding:20px 16px 32px}.book-card{grid-template-columns:88px minmax(0,1fr);padding:16px;gap:16px}.book-card h2{font-size:23px}.book-card .actions{grid-column:1/-1}.book-card .btn{flex:1}.paper{padding:23px 18px}.unit-list{grid-template-columns:minmax(0,1fr)}.reading-text{line-height:1.85}.chapter-card{padding:16px}.reader-title{font-size:11px}.view-tabs{position:sticky;top:76px;z-index:10}.reader-nav{margin-bottom:12px}.book-card p.muted{font-size:12px}.own-context{padding:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.learning-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin:0 0 20px;padding:0;list-style:none}.learning-flow li{font-size:11px;line-height:1.5;padding:9px 7px;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--muted);min-width:0;word-break:keep-all}.learning-flow small{display:block;font-size:10px;letter-spacing:.08em;margin-bottom:3px}.learning-flow [aria-current=step]{border-color:var(--accent);color:var(--accent);background:var(--accent-soft);font-weight:700}.exercise-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.exercise-tabs button{font-size:13px;min-height:44px;word-break:keep-all}.reading-scopes{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}.reading-scopes .btn{font-size:12px;padding:7px 10px;min-height:40px}.reading-scopes [aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.quiz-progress{font-size:12px;color:var(--muted);margin:12px 0}.reading-prompt{font-size:20px;line-height:1.65;margin:14px 0 22px;word-break:keep-all;overflow-wrap:anywhere}.reading-choice{display:flex;align-items:flex-start;gap:10px;line-height:1.75;word-break:keep-all;overflow-wrap:anywhere}.option-number{flex:none;width:24px;height:24px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:50%;font-size:12px;margin-top:1px}.reading-choice:disabled{opacity:1;cursor:default}.reading-choice.correct .option-number{border-color:var(--good);color:var(--good)}.reading-choice.wrong .option-number{border-color:var(--warn);color:var(--warn)}.reading-feedback{border-top:1px solid var(--line);margin-top:22px;padding-top:18px;font-size:14px;line-height:1.85}.reading-feedback h3{font-size:17px;color:var(--accent)}.wrong-reason{color:var(--warn)}.evidence{background:var(--accent-soft);border-radius:12px;margin:18px 0;padding:14px}.evidence blockquote{font:19px/1.8 var(--f-read);margin:10px 0 14px;overflow-wrap:anywhere}.evidence .btn{font-size:12px;min-height:38px;padding:6px 10px;background:var(--paper)}.option-explanations{margin:16px 0}.option-explanations summary{cursor:pointer;font-weight:600;min-height:36px}.option-explanations p{font-size:13px}.discovery-pattern{font:600 25px/1.5 var(--f-read);overflow-wrap:anywhere;margin:12px 0}.discovery-example{font:21px/1.9 var(--f-read);border-left:3px solid var(--accent);padding:8px 0 8px 16px;margin:22px 0;overflow-wrap:anywhere}.review-date{background:var(--accent-soft);color:var(--accent);padding:10px 12px;border-radius:10px;font-size:12px}.recall-check{display:flex;align-items:flex-start;gap:9px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.7;word-break:keep-all;overflow-wrap:anywhere}.recall-check input{flex:none;width:20px;height:20px;margin:3px 0 0;accent-color:var(--accent)}#advancedWorkbook details>summary{min-height:36px;cursor:pointer}#advancedWorkbook details li{font-size:13px;line-height:1.8;margin:8px 0}#advancedWorkbook textarea{width:100%;min-width:0}.reading-question .choices{margin-top:8px}
@media(max-width:380px){.learning-flow{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-flow small{display:inline;margin-right:5px}.exercise-tabs button{font-size:12px;padding:8px 4px}.reading-prompt{font-size:18px}.reading-choice{padding:11px 10px;gap:7px;font-size:13px}}


/* Preserve the PDF page itself, including its original colors and typography. */
.original-page{width:100%;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:6px;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch}.original-page img{display:block;max-width:none;height:auto}.original-toc{display:flex;align-items:center;gap:10px;margin-bottom:12px}.original-toc label{flex:none;font-size:13px;color:var(--muted)}.original-toc select{min-width:0;width:100%;min-height:44px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:8px;color:var(--ink)}

.meaning-evidence{margin-top:20px;border-top:1px solid var(--line);padding-top:18px}.meaning-evidence blockquote{margin:10px 0 16px;font-size:18px;line-height:1.85;overflow-wrap:anywhere;color:var(--ink)}.meaning-evidence strong{color:var(--accent);font-weight:700}

.brand small{font-family:var(--f-ui);font-size:12px;font-weight:500;line-height:1.5;letter-spacing:0}.eyebrow{font-family:var(--f-ui);font-size:12px;font-weight:600;line-height:1.6;letter-spacing:.025em}