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.leaderboard-chip{font-size:.8rem}html[lang=ja] .course-action-btn,html[lang=zh] .course-action-btn,html[lang=ko] .course-action-btn,html[lang=ja] .beta-notice,html[lang=zh] .beta-notice,html[lang=ko] .beta-notice{font-size:.85rem}html[lang=ja] .leaderboard-tab,html[lang=zh] .leaderboard-tab,html[lang=ko] .leaderboard-tab{text-transform:none}:root{--mono:"SF Mono","Fira Code","Cascadia Code",Consolas,monospace;--content:"Nunito","Noto Sans JP","Noto Sans KR","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe 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#ffffff4d}.header-create-btn:hover{color:#fff;background:#000;border-color:#fff}.more-menu-wrap{position:relative}.more-menu-btn{color:#fffc;cursor:pointer;background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;transition:all .2s;display:flex}.more-menu-btn:hover{color:#fff;background:#ffffff1a}.more-menu-dropdown{z-index:200;background:#fff;border:2px solid #000;min-width:180px;padding:4px;position:absolute;top:calc(100% + 6px);right:0;box-shadow:0 4px 16px #00000026}.more-menu-option{width:100%;font-family:var(--mono);color:#000;cursor:pointer;text-align:left;letter-spacing:.02em;background:0 0;border:none;padding:10px 14px;font-size:.75rem;font-weight:600;transition:background .1s;display:block}.more-menu-option:hover{background:#f0f0f0}.more-menu-divider{background:#000;height:2px;margin:4px 0}.header-lang-wrap{position:relative}.header-lang-btn{color:#ffffffe6;cursor:pointer;height:28px;font-family:var(--mono);letter-spacing:.05em;background:#ffffff1a;border:1.5px solid #ffffff4d;justify-content:center;align-items:center;padding:0 8px;font-size:.65rem;font-weight:700;transition:all .2s;display:flex}.header-lang-btn:hover{color:#fff;background:#fff3;border-color:#ffffff80}.header-lang-dropdown{z-index:200;background:#fff;border:2px solid #000;min-width:140px;padding:4px;position:absolute;top:calc(100% + 6px);right:0;box-shadow:0 4px 16px #00000026}.header-lang-option{width:100%;font-family:var(--mono);color:#000;cursor:pointer;text-align:left;background:0 0;border:none;padding:8px 12px;font-size:.75rem;font-weight:600;transition:background .1s;display:block}.header-lang-option:hover{background:#f0f0f0}.header-lang-option.selected{color:#fff;background:#000}.report-bug-modal .modal-content{border-radius:var(--radius);color:#000;background:#fff;border:4px solid 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var(--border);cursor:pointer;border-radius:16px;align-items:center;gap:16px;padding:16px 20px;transition:all .2s;display:flex;box-shadow:0 2px 8px #0000000a}.action-card:hover{border-color:var(--border-hover);background:var(--bg-hover);transform:translateY(-2px);box-shadow:0 4px 12px #00000014}.action-info{flex:1;min-width:0}.action-title{margin-bottom:4px;font-size:1.125rem;font-weight:600}.action-desc{color:var(--text-secondary);font-size:.875rem}.action-icon{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:56px;height:56px;display:flex}.action-icon.purple{color:#fff;background:linear-gradient(135deg,#b8b6ff,#a8a6ff)}.action-icon.pink{color:#fff;background:linear-gradient(135deg,#f06292,#e91e63)}.action-icon.teal{color:#fff;background:linear-gradient(135deg,#4db6ac,#26a69a)}.action-icon.amber{color:#000;background:linear-gradient(135deg,#ffc29f 0% 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var(--accent);text-align:left;background:#f8f9ff;border-radius:0 8px 8px 0;padding:12px 16px}.flashcard-example{color:var(--text-secondary);font-size:1.05rem;font-style:italic}.flashcard-actions{justify-content:center;gap:12px;padding-top:24px;display:flex}.flashcard-btn{border:2px solid var(--border);background:var(--bg-elevated);max-width:100px;color:var(--text);cursor:pointer;border-radius:12px;flex:1;padding:14px 12px;font-family:inherit;font-size:.95rem;font-weight:600;transition:all .15s;box-shadow:0 2px 4px #0000000d}.flashcard-btn:hover{transform:translateY(-3px);box-shadow:0 6px 12px #0000001a}.flashcard-btn:active{transform:translateY(-1px);box-shadow:0 3px 6px #00000014}.flashcard-btn small{opacity:.75;margin-top:4px;font-size:.75rem;font-weight:500;display:block}.flashcard-btn.again{color:#000;background:#ffe8f6;border-color:#ffa6f6}.flashcard-btn.again:hover{background:#ffa6f6;border-color:#000}.flashcard-btn.hard{color:#000;background:#fff0e0;border-color:#ffc29f}.flashcard-btn.hard:hover{background:#ffc29f;border-color:#000}.flashcard-btn.good{color:#000;background:#eef;border-color:#a8a6ff}.flashcard-btn.good:hover{background:#a8a6ff;border-color:#000}.flashcard-btn.easy{color:#000;background:#e8ffe0;border-color:#b8ff9f}.flashcard-btn.easy:hover{background:#b8ff9f;border-color:#000}.session-complete{text-align:center;padding:60px 20px}.session-complete-icon{margin-bottom:16px;font-size:4rem}.session-complete h2{margin-bottom:8px;font-size:1.5rem}.session-complete p{color:var(--text-secondary);margin-bottom:24px}.quiz-header{justify-content:space-between;align-items:center;padding-bottom:24px;display:flex}.quiz-progress-text{color:var(--text-secondary);font-size:.875rem}.quiz-score{color:var(--accent);font-size:.875rem;font-weight:600}.quiz-question{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);text-align:center;margin-bottom:20px;padding:32px}.quiz-prompt{color:var(--text-secondary);margin-bottom:12px;font-size:.875rem}.quiz-phrase{letter-spacing:-.02em;margin-bottom:8px;font-size:1.75rem;font-weight:700}.quiz-region{color:var(--text-muted);font-size:.8rem}.quiz-options{flex-direction:column;gap:10px;display:flex}.quiz-option{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--text);text-align:left;cursor:pointer;padding:16px 20px;font-family:inherit;font-size:1rem;transition:all 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#0000001f}.chapter-info{flex:1}.chapter-number{color:var(--accent);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;font-size:.75rem}.chapter-name{margin-bottom:4px;font-size:1.1rem;font-weight:600}.chapter-desc{color:var(--text-secondary);font-size:.85rem}.chapter-meta{text-align:right}.chapter-count{color:var(--text-muted);margin-bottom:8px;font-size:.8rem}.chapter-progress-bar{background:var(--border);border-radius:var(--radius);border:1px solid #333;width:80px;height:4px;overflow:hidden}.chapter-progress-fill{background:var(--accent);height:100%}.bottom-bar{background:var(--bg-elevated);border-top:1px solid var(--border);z-index:100;justify-content:center;gap:8px;padding:12px 24px;display:flex;position:fixed;bottom:0;left:0;right:0}.bar-btn{max-width:100px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:14px;flex:1;padding:8px 14px;font-family:inherit;font-size:.75rem;font-weight:500;transition:all 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