:root{--study-paper:#fcfdff;--study-tint:#eaf2ff;--study-rule:#b6c9e4;--study-shadow:#cedaeb;--study-blue:#205c9f;--study-blue-soft:#e0eeff;--study-mint:#116650;--study-mint-soft:#d8f3e8;--study-gold:#745016;--study-gold-soft:#fff0b9;--study-rose:#a32b47;--study-rose-soft:#ffe0e8;color:var(--ink);font-weight:500}.lesson-workbook{width:min(1280px,100%);margin:0 auto;padding:32px clamp(20px,4vw,48px) 64px}.workbook-back{display:inline-flex;align-items:center;gap:8px;color:var(--ink-soft);font-size:.85rem;font-weight:650;min-height:44px}.workbook-back:hover{color:var(--color-blue)}.workbook-grid{display:grid;grid-template-columns:minmax(0,1fr) 264px;grid-gap:clamp(28px,4vw,56px);gap:clamp(28px,4vw,56px);align-items:start;margin-top:22px}.workbook-content{min-width:0}.workbook-header{margin-bottom:32px}.lesson-meta{display:flex;align-items:center;gap:12px;color:var(--ink-soft);font-size:.8rem;font-weight:650;margin-bottom:14px}.lesson-category{background:var(--study-blue-soft);color:var(--study-blue);border:1px solid var(--study-rule);padding:4px 10px;border-radius:7px}.guided-heading h1,.workbook-header h1{color:var(--navy);font-size:clamp(1.9rem,3.3vw,3rem);font-weight:750;line-height:1.18;letter-spacing:-.035em;overflow-wrap:anywhere;text-wrap:balance}.guided-heading>p,.workbook-header>p{max-width:65ch;margin-top:16px;font-size:1.06rem;line-height:1.7;color:var(--ink-soft)}.workbook-section{margin-top:44px;scroll-margin-top:24px}.workbook-section-title{display:flex;align-items:center;gap:10px;margin-bottom:18px;color:var(--navy)}.workbook-section-title h2{font-size:1.28rem;font-weight:750;line-height:1.3;letter-spacing:-.02em}.workbook-section-title>span{margin-left:auto;color:var(--ink-soft);font-size:.8rem;white-space:nowrap}.workbook-section-title>svg{flex-shrink:0;color:var(--study-blue)}.pattern-board{padding:clamp(20px,3vw,32px);background:var(--study-tint);border:1px solid var(--study-rule);border-top:5px solid var(--color-blue);border-radius:18px;box-shadow:0 5px 0 var(--study-shadow),0 12px 28px rgba(30,71,120,.07);scroll-margin-top:24px}.pattern-formula{color:var(--navy);font-size:clamp(1.15rem,2vw,1.65rem);line-height:1.7;font-weight:700;margin-bottom:24px;overflow-wrap:anywhere}.pattern-steps{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:14px;gap:14px;padding:0;margin:0}.tone-0{--part-ink:var(--study-blue);--part-tint:var(--study-blue-soft)}.tone-1{--part-ink:var(--study-rose);--part-tint:var(--study-rose-soft)}.tone-2{--part-ink:var(--study-mint);--part-tint:var(--study-mint-soft)}.tone-3{--part-ink:var(--study-gold);--part-tint:var(--study-gold-soft)}.pattern-part{min-width:0;position:relative;padding:17px 18px 18px;background:var(--part-tint);border:1px solid var(--study-rule);border-bottom:3px solid var(--part-ink);border-radius:11px}.pattern-part-order{display:inline-grid;place-items:center;width:24px;height:24px;margin-right:8px;background:var(--part-tint);color:var(--part-ink);border-radius:6px;font-size:.75rem;font-weight:750;vertical-align:middle}.pattern-part strong{color:var(--part-ink);font-size:1.05rem;line-height:1.6;overflow-wrap:anywhere}.pattern-part p{margin-top:8px;color:var(--ink-soft);font-size:.87rem;line-height:1.55}.pattern-part:last-child:nth-child(odd){grid-column:1/-1}.pattern-fallback{font-size:1.2rem;overflow-wrap:anywhere}.example-stack{display:grid;grid-gap:16px;gap:16px}.example-sentence{padding:23px 26px;background:var(--study-paper);border:1px solid var(--study-rule);border-left:4px solid var(--study-mint);border-radius:12px;box-shadow:0 3px 0 var(--study-shadow)}.example-context{margin:0 0 12px;color:var(--study-mint);font-size:.84rem;font-weight:700}.example-jp{color:var(--navy);font-size:clamp(1.2rem,1.8vw,1.65rem);line-height:1.9;font-weight:650;overflow-wrap:anywhere}.example-en{margin-top:12px;color:var(--ink-soft);line-height:1.65;font-size:.95rem}.sentence-mark{color:var(--part-ink);background:var(--part-tint);border-radius:4px;padding:2px 3px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.conversation-stack{display:grid;grid-gap:22px;gap:22px}.dialogue-scene{border:1px solid var(--study-rule);border-radius:16px;background:var(--study-paper);padding:24px;box-shadow:0 4px 0 var(--study-shadow)}.dialogue-scene h3{display:flex;align-items:center;gap:9px;color:var(--navy);font-size:.95rem;font-weight:750;margin-bottom:22px}.dialogue-scene h3 svg{color:var(--study-rose)}.dialogue-line{display:grid;grid-template-columns:32px minmax(0,1fr);grid-gap:12px;gap:12px;margin:0 38px 18px 0;align-items:start}.dialogue-speaker{width:32px;height:32px;display:grid;place-items:center;background:var(--study-blue-soft);color:var(--study-blue);border:1px solid var(--study-rule);border-radius:10px;font-size:.85rem;font-weight:750}.dialogue-line>div{padding:16px 18px;border-radius:0 12px 12px 12px;background:var(--study-blue-soft);color:var(--navy);font-size:1.1rem;line-height:1.75;overflow-wrap:anywhere}.dialogue-line.is-reply{margin:0 0 0 38px}.is-reply .dialogue-speaker,.is-reply>div{background:var(--study-mint-soft)}.is-reply .dialogue-speaker{color:var(--study-mint)}.dialogue-translation{margin-top:8px;color:var(--ink-soft);font-size:.86rem;line-height:1.6}.lesson-caution{margin-top:36px;padding:24px 28px;background:var(--study-rose-soft);border:1px solid var(--study-rule);border-left:4px solid var(--study-rose);border-radius:12px;scroll-margin-top:24px}.lesson-caution .workbook-section-title>svg{color:var(--study-rose)}.lesson-caution ul{padding-left:20px;font-size:.95rem;line-height:1.75}.lesson-caution li+li{margin-top:8px}.workbook-practice{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-top:40px;padding:30px;border:1px solid var(--study-rule);border-radius:16px;background:var(--study-mint-soft);box-shadow:0 4px 0 var(--study-shadow)}.workbook-practice h2{color:var(--navy);font-size:1.5rem;font-weight:750;margin:8px 0}.workbook-practice p{color:var(--ink-soft);font-size:.9rem;max-width:35ch}.workbook-practice svg{color:var(--study-mint)}.workbook-rail{display:grid;grid-gap:24px;gap:24px;position:-webkit-sticky;position:sticky;top:28px;padding-top:8px}.lesson-route-card{border:1px solid var(--study-rule);border-radius:16px;padding:24px;background:var(--study-paper);box-shadow:0 5px 0 var(--study-shadow),0 12px 24px rgba(23,34,59,.06)}.route-card-icon{display:grid;place-items:center;width:48px;height:48px;color:var(--study-blue);background:var(--study-blue-soft);border:1px solid var(--study-rule);border-radius:13px;box-shadow:2px 3px 0 var(--study-shadow);transform:rotate(-4deg);margin-bottom:20px}.lesson-route-card h2{color:var(--navy);font-size:1.45rem;font-weight:750;letter-spacing:-.025em}.lesson-route-card>p{color:var(--ink-soft);font-size:.88rem;line-height:1.65;margin:10px 0 20px}.lesson-route-card>.study-button{width:100%}.lesson-route-card nav{display:grid;margin-top:24px;padding-top:14px;border-top:1px solid var(--study-rule)}.lesson-route-card nav a{min-height:40px;display:flex;align-items:center;color:var(--ink-soft);font-size:.85rem}.lesson-route-card nav a:hover{color:var(--study-blue);text-decoration:underline;text-underline-offset:4px}.workbook-rail .lesson-actions{display:grid;grid-gap:8px;gap:8px;margin:0}.workbook-rail .lesson-actions button{background:var(--study-paper);color:var(--ink-soft);justify-content:flex-start;font-weight:650;font-size:.82rem}.exam-note{padding:24px;background:var(--study-gold-soft);color:var(--study-gold);border:1px solid var(--study-rule);border-radius:12px;box-shadow:2px 4px 0 var(--study-shadow)}.exam-note h2{color:var(--navy);font-size:1rem;font-weight:750;margin:10px 0}.exam-note p{font-size:.87rem;line-height:1.7;color:var(--ink)}.study-button{display:inline-flex;flex-shrink:0;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:11px 17px;border:1px solid #a51d36;border-radius:10px;color:#fff8fa;background:#bf2944;box-shadow:0 3px 0 #861d31,0 6px 12px rgba(163,43,71,.1);font:inherit;font-size:.88rem;font-weight:700;white-space:nowrap;transition:transform .16s,box-shadow .16s}.study-button svg{color:inherit;flex-shrink:0}.study-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 0 #861d31,0 9px 15px rgba(163,43,71,.12)}.study-button:active:not(:disabled){transform:translateY(2px);box-shadow:0 1px 0 #861d31}.study-button-secondary{background:var(--study-paper);color:var(--ink);border-color:var(--study-rule);box-shadow:0 3px 0 var(--study-shadow)}.study-button-secondary:hover:not(:disabled){box-shadow:0 5px 0 var(--study-shadow)}.study-button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.study-text-button{min-height:44px;padding:8px 0;border:0;background:none;color:var(--study-blue);font:inherit;font-size:.88rem;font-weight:650;text-decoration:underline;text-underline-offset:4px}.player-refresh{display:flex;align-items:flex-start;min-height:100dvh}.player-main{flex:1 1;min-width:0}.player-toolbar{justify-content:space-between;gap:20px;padding:16px clamp(20px,3vw,40px);border-bottom:1px solid var(--border);background:var(--study-paper)}.player-phases,.player-toolbar{display:flex;align-items:center}.player-phases{gap:16px;font-size:.8rem;font-weight:650;color:var(--ink-soft)}.player-phases span{display:flex;align-items:center;gap:7px}.player-phases [aria-current]{color:var(--study-blue)}.player-content{width:min(100%,980px);padding:30px clamp(20px,3vw,40px) 88px;margin:0 auto}.guided-board{width:100%;min-width:0}.guided-progress{display:flex;justify-content:space-between;gap:16px;color:var(--ink-soft);font-size:.8rem;font-weight:650;margin-bottom:10px}.guided-progress-segments{display:flex;gap:6px;margin-bottom:30px}.guided-progress-segments span{flex:1 1;height:5px;background:var(--study-rule);border-radius:3px}.guided-progress-segments .is-done{background:var(--color-blue)}.guided-heading{margin-bottom:26px}.guided-heading h1{font-size:clamp(1.65rem,2.5vw,2.25rem)}.guided-tip{display:flex;align-items:flex-start;gap:12px;margin-top:24px;padding:20px 22px;background:var(--study-gold-soft);border:1px solid var(--study-rule);border-radius:12px}.guided-tip svg{color:var(--study-gold);flex-shrink:0;margin-top:3px}.guided-tip p{color:var(--ink);font-size:.9rem;line-height:1.65}.guided-tip strong{display:block;color:var(--navy);margin-bottom:4px}.guided-controls{display:flex;justify-content:space-between;gap:16px;margin-top:28px;padding-top:22px;border-top:1px solid var(--border)}.guided-instruction{color:var(--ink-soft);font-size:.92rem;margin-bottom:20px}.pattern-reminder{margin-top:28px}.pattern-reminder summary{min-height:44px;cursor:pointer;color:var(--study-blue);font-size:.9rem;font-weight:700}.practice-progress{height:6px;background:var(--study-rule);overflow:hidden;border-radius:4px;margin-bottom:28px}.practice-progress>span{display:block;height:100%;background:var(--study-mint);transform-origin:left;transition:transform .2s}.player-refresh .ai-chat-sidebar{width:310px!important;height:100dvh!important}.player-refresh .ai-chat-sidebar form input{width:0;min-width:0}.player-refresh .fun-card,.player-refresh .task-container{padding:clamp(22px,3vw,32px);background:var(--study-paper)}.choice-task{width:100%;min-width:0;max-width:760px;margin-inline:auto}.choice-task h2{text-align:left;color:var(--navy);font-size:clamp(1.15rem,2vw,1.4rem);line-height:1.5;margin:0 0 24px;font-weight:700;overflow-wrap:anywhere}.choice-options{display:grid;grid-gap:12px;gap:12px}.choice-options .mcq-option{margin:0;display:flex;align-items:center;gap:14px;padding:16px;border:1px solid var(--study-rule);border-radius:11px;color:var(--navy);background:var(--study-paper);box-shadow:0 3px 0 var(--study-shadow);text-align:left;font-size:1rem;font-weight:600;line-height:1.6;white-space:normal}.choice-letter{width:30px;height:30px;flex-shrink:0;display:grid;place-items:center;color:var(--study-blue);background:var(--study-blue-soft);border-radius:7px;font-size:.8rem}.choice-answer{min-width:0}.ai-chat-message,.choice-answer{overflow-wrap:anywhere}.ai-chat-message a{color:var(--study-blue);text-decoration:underline;text-underline-offset:3px;font-weight:700}.ai-chat-message code{font-size:.9em;background:var(--study-tint);color:var(--navy);padding:2px 4px;border-radius:4px;white-space:pre-wrap}.choice-options .mcq-option.correct{color:var(--study-mint);background:var(--study-mint-soft);border-color:var(--study-mint)}.choice-options .mcq-option.incorrect{color:var(--study-rose);background:var(--study-rose-soft);border-color:var(--study-rose)}.choice-options .mcq-option:disabled{opacity:1;cursor:default;transform:none}.choice-options .mcq-option svg{flex-shrink:0;margin-left:auto}.choice-feedback{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:26px;padding-top:22px;border-top:1px solid var(--study-rule)}.choice-feedback span,.choice-feedback strong{display:block}.choice-feedback strong{font-size:.95rem;color:var(--study-mint)}.choice-feedback.is-incorrect strong{color:var(--study-rose)}.choice-feedback p>span{color:var(--ink-soft);font-size:.87rem;margin-top:5px}.practice-check{padding:clamp(24px,4vw,40px);background:var(--study-paper);border:1px solid var(--study-rule);border-radius:16px;box-shadow:0 4px 0 var(--study-shadow)}.practice-check h1{color:var(--navy);font-size:2rem;line-height:1.2;margin-bottom:16px}.practice-check>p{color:var(--ink-soft);line-height:1.7;margin-bottom:24px}.practice-check-actions{display:flex;flex-wrap:wrap;gap:12px 20px}.practice-check .practice-error{color:var(--study-rose);background:var(--study-rose-soft);padding:16px;border-radius:10px}.practice-loading{padding:18px;border-radius:10px;background:var(--study-blue-soft)}.lesson-completion{max-width:760px;margin:80px auto;padding:28px;color:var(--ink)}.lesson-completion>svg{color:var(--teal);margin-bottom:24px}.lesson-completion h1{line-height:1.2;margin-bottom:16px}.answer-label{display:block;color:var(--navy);font-weight:650;margin-bottom:8px;font-size:.9rem}.practice-task-title{color:var(--navy);font-size:1.4rem;line-height:1.35;font-weight:750;margin-bottom:22px}.practice-prompt{background:var(--purple-soft);padding:18px 20px;border-radius:10px;border-left:3px solid var(--purple);margin-bottom:24px}.translation-task .practice-prompt{background:var(--vermillion-soft);border-color:var(--vermillion)}.practice-prompt>p:first-child{color:var(--ink-soft);font-size:.85rem;font-weight:600;margin-bottom:7px}.practice-prompt>p:last-child{color:var(--navy);font-size:1.15rem;line-height:1.6;font-weight:650}.translation-self-review>p[lang]{color:var(--navy);font-size:1.2rem;line-height:1.8;margin-bottom:18px}.sentence-word-pool{border:0;padding:0;background:transparent}.player-refresh .builder-task,.player-refresh .translation-task{text-align:left}.player-refresh .sentence-word-pool{justify-content:flex-start!important;min-height:70px!important}.player-refresh .draggable-item{border:1px solid var(--study-rule);box-shadow:0 3px 0 var(--study-shadow);border-radius:9px;font-size:1.1rem}.player-refresh .fun-button:active{transform:translateY(2px)}.assistant-backdrop{position:fixed;inset:0;z-index:79;background:rgba(23,34,59,.42);border:0}.workbook-mobile-start{display:none;margin-top:22px}.workbook-topbar{display:flex;justify-content:space-between;align-items:center;gap:16px}.study-theme-toggle{min-height:40px;display:inline-flex;align-items:center;gap:7px;border:1px solid var(--study-rule);padding:8px 11px;border-radius:9px;color:var(--ink-soft);background:var(--study-paper);font:inherit;font-size:.76rem;font-weight:650}.lesson-library{max-width:1320px;width:100%;margin:0 auto;padding:40px clamp(18px,4vw,48px) 64px}.library-finder{padding:24px;border:1px solid var(--study-rule);border-radius:14px;background:var(--study-gold-soft);box-shadow:0 4px 0 var(--study-shadow);margin-bottom:36px}.library-finder>div:first-child{display:flex;align-items:center;gap:10px;color:var(--study-gold);margin-bottom:16px}.library-finder h2{color:var(--navy);font-size:1.15rem;font-weight:750}.library-finder form{display:flex;align-items:flex-end;gap:14px}.library-search-field{flex:1 1;min-width:0}.library-search-field label{display:block;font-size:.84rem;color:var(--ink);margin-bottom:7px;font-weight:650}.library-search-field input{width:100%;min-height:46px;padding:11px 14px;color:var(--navy);background:var(--study-paper);font:inherit;font-size:.95rem}.library-search-field input::placeholder{color:var(--ink-soft);opacity:1}.library-view-bar{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;margin-bottom:22px}.library-view-bar>h2{font-size:1.18rem;font-weight:750;color:var(--navy)}.library-view-switcher{display:flex;gap:4px;padding:4px;border:1px solid var(--study-rule);background:var(--study-paper);border-radius:11px}.library-view-switcher button{display:flex;align-items:center;gap:7px;min-height:38px;padding:8px 12px;border:0;background:transparent;color:var(--ink-soft);border-radius:7px;font-size:.8rem;font-weight:650}.library-view-switcher [aria-pressed=true]{background:var(--study-blue-soft);color:var(--study-blue)}.library-search-results{margin-top:24px}.library-search-results>p{color:var(--ink);font-size:.92rem;line-height:1.65}.library-search-results .lesson-card-grid{padding:20px 0 0}.search-reason{color:var(--ink-soft);font-size:.83rem;line-height:1.6;margin:14px 4px 0}.lesson-tiers{display:grid;grid-gap:24px;gap:24px}.lesson-tier{min-width:0;border:1px solid var(--study-rule);border-radius:16px;background:var(--study-paper);box-shadow:0 4px 0 var(--study-shadow)}.lesson-tier-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 24px;color:var(--part-ink);background:var(--part-tint);border:0;border-radius:15px;text-align:left}.lesson-tier-toggle[aria-expanded=true]{border-radius:15px 15px 0 0;border-bottom:1px solid var(--study-rule)}.lesson-tier-toggle strong{display:block;font-size:1.25rem;font-weight:750;line-height:1.3}.lesson-tier-toggle strong+span{display:block;color:var(--ink-soft);font-size:.85rem;font-weight:500;margin-top:5px}.tier-count{display:flex;align-items:center;gap:14px;font-size:.8rem;font-weight:650;white-space:nowrap}.lesson-tier-toggle[aria-expanded=true] .tier-count svg{transform:rotate(180deg)}.lesson-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));grid-gap:20px;gap:20px;padding:24px}.library-card{min-width:0;display:flex;flex-direction:column;background:var(--study-paper);border:1px solid var(--study-rule);border-top:4px solid var(--part-ink);border-radius:12px;box-shadow:0 3px 0 var(--study-shadow);transition:transform .18s}.library-card:has(a:hover){transform:translateY(-3px)}.library-card-link{display:block;flex:1 1;padding:19px 20px 17px;border-radius:8px}.library-card-meta{display:flex;gap:8px;align-items:center;justify-content:space-between;margin-bottom:13px;color:var(--part-ink);font-size:.75rem;font-weight:700}.library-card-meta>span{padding:3px 7px;border-radius:5px;background:var(--part-tint)}.library-card h3{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;color:var(--navy);font-size:1.13rem;font-weight:700;line-height:1.4;letter-spacing:-.015em}.library-card h3>svg{flex-shrink:0;color:var(--part-ink);margin-top:4px}.library-card-link>p{color:var(--ink-soft);font-size:.87rem;line-height:1.7;margin-top:10px}.library-card-actions{display:flex;gap:12px;padding:4px 14px;border-top:1px solid var(--study-rule);background:var(--part-tint);border-radius:0 0 11px 11px}.library-card-actions button{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:6px;border:0;color:var(--ink-soft);background:transparent;font:inherit;font-size:.75rem;font-weight:600}.library-card-actions [aria-pressed=true]{color:var(--part-ink)}.lesson-kanban{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:20px;gap:20px;align-items:start}.kanban-column>header{padding:18px;border-radius:12px;background:var(--part-tint);border-bottom:3px solid var(--part-ink);margin-bottom:20px}.kanban-column h2{font-size:1.02rem;line-height:1.4;color:var(--part-ink);font-weight:750}.kanban-column header p{color:var(--ink-soft);font-size:.8rem;margin-top:5px}.kanban-column>div{display:grid;grid-gap:20px;gap:20px}.lesson-metro{max-width:900px;margin:0 auto 0 0}.metro-section{margin-bottom:36px}.metro-section>header{padding:18px 22px;border-radius:12px;background:var(--part-tint);color:var(--part-ink);margin-bottom:22px}.metro-section h2{font-size:1.25rem;font-weight:750}.metro-section header p{color:var(--ink-soft);font-size:.85rem;margin-top:5px}.metro-section ol{display:grid;grid-gap:20px;gap:20px;padding:0 0 0 28px;margin-left:17px;border-left:4px solid 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