:root{--bg:#f5f0e6;--bg-card:#faf7f2;--forest:#3d6b52;--forest-dark:#2a4d3a;--forest-light:#6a9e7f;--amber:#d4880a;--amber-light:#f0a832;--amber-dark:#b06e00;--text:#2c2c2c;--text-muted:#7a7a6a;--border:#ddd8cc;--locked:#b0a898;--white:#fff;--correct:#3d8b52;--wrong:#c44;--bg-done:#f0f7f2;--bg-hover:#f8f8f4;--correct-bg:#eaf5ec;--correct-border:#b8ddc0;--wrong-bg:#fdeaea;--wrong-border:#e8b8b8}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100dvh;font-family:Noto Sans JP,sans-serif;line-height:1.7}h1,h2,h3,h4{letter-spacing:-.02em;font-family:Noto Serif JP,serif;line-height:1.3}.header{z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);background:#f5f0e6eb;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:1rem;max-width:800px;margin:0 auto;padding:.75rem 1.25rem;display:flex}.logo-area{align-items:center;gap:.75rem;display:flex}.logo-img{object-fit:contain;flex-shrink:0;width:auto;height:36px}.logo-text h1{color:var(--text);font-size:1rem;font-weight:600}.logo-text p{color:var(--text-muted);margin-top:-2px;font-size:.75rem}.progress-bar-wrap{flex-shrink:0;align-items:center;gap:.5rem;display:flex}.progress-label{color:var(--text-muted);font-size:.75rem;display:none}.progress-track{background:var(--border);border-radius:4px;width:80px;height:8px;overflow:hidden}.progress-fill{background:var(--forest);border-radius:4px;height:100%;transition:width .4s}.progress-text{color:var(--text-muted);white-space:nowrap;font-variant-numeric:tabular-nums;font-size:.7rem}.roadmap-body{max-width:800px;margin:0 auto;padding:2rem 1.25rem 4rem}.stage-section{flex-direction:column;align-items:center;display:flex}.stage-connector{padding:.5rem 0}.stage-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;width:100%;margin-bottom:.5rem;padding:1.5rem}.stage-card .progress-bar-wrap{margin:1rem 0}.stage-card .progress-label{display:none}.stage-card .progress-track{flex:1;width:100%}.stage-header{align-items:flex-start;gap:.75rem;margin-bottom:.25rem;display:flex}.stage-emoji{flex-shrink:0;font-size:1.75rem;line-height:1}.stage-info h2{font-size:1.15rem;font-weight:600}.stage-desc{color:var(--text-muted);margin-top:.25rem;font-size:.85rem;line-height:1.5}.stage-amber{border-left:4px solid var(--amber)}.stage-forest-light{border-left:4px solid var(--forest-light)}.stage-forest{border-left:4px solid var(--forest)}.stage-forest-dark{border-left:4px solid var(--forest-dark)}.stage-amber-dark{border-left:4px solid var(--amber-dark)}.stage-amber .progress-fill{background:var(--amber)}.stage-forest-light .progress-fill{background:var(--forest-light)}.stage-forest .progress-fill{background:var(--forest)}.stage-forest-dark .progress-fill{background:var(--forest-dark)}.stage-amber-dark .progress-fill{background:var(--amber-dark)}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.75rem;margin-top:.75rem;display:grid}.lesson-node{background:var(--white);border:1px solid var(--border);cursor:pointer;border-radius:12px;flex-direction:column;align-items:center;gap:.35rem;padding:.85rem .5rem;transition:transform .15s,box-shadow .15s;display:flex;position:relative}.lesson-node:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000000f}.lesson-node:focus-visible{outline:2px solid var(--forest);outline-offset:2px}.lesson-node.done{background:var(--bg-done);border-color:var(--forest-light)}.node-number{color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:.65rem;position:absolute;top:6px;left:8px}.node-icon{font-size:1.5rem;line-height:1}.node-title{text-align:center;color:var(--text);font-size:.78rem;font-weight:500;line-height:1.3}.modal-overlay{z-index:200;background:#0006;justify-content:center;align-items:center;padding:1rem;display:flex;position:fixed;inset:0;overflow-y:auto}.modal-content{background:var(--bg-card);border-left:4px solid var(--forest);border-radius:20px;width:100%;max-width:560px;max-height:90vh;padding:2rem;position:relative;overflow-y:auto}.modal-content.stage-amber{border-left-color:var(--amber)}.modal-content.stage-forest-light{border-left-color:var(--forest-light)}.modal-content.stage-forest{border-left-color:var(--forest)}.modal-content.stage-forest-dark{border-left-color:var(--forest-dark)}.modal-content.stage-amber-dark{border-left-color:var(--amber-dark)}.modal-close{border:1px solid var(--border);background:var(--white);cursor:pointer;width:36px;height:36px;color:var(--text-muted);border-radius:50%;justify-content:center;align-items:center;font-size:1.25rem;transition:background .15s;display:flex;position:absolute;top:1rem;right:1rem}.modal-close:hover{background:var(--bg)}.modal-header{align-items:center;gap:.75rem;margin-bottom:1rem;padding-right:2.5rem;display:flex}.modal-emoji{flex-shrink:0;font-size:2rem}.modal-header h2{font-size:1.2rem;font-weight:700}.modal-stage-name{color:var(--text-muted);font-size:.8rem}.completed-badge{flex-shrink:0;margin-left:auto;font-size:.85rem}.modal-desc{color:var(--text-muted);margin-bottom:1.25rem;font-size:.9rem;line-height:1.6}.modal-points{margin-bottom:1.5rem}.modal-points h3{color:var(--forest-dark);margin-bottom:.5rem;font-size:.95rem;font-weight:600}.modal-points ul{flex-direction:column;gap:.5rem;list-style:none;display:flex}.modal-points li{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:.65rem .85rem;font-size:.88rem;line-height:1.5}.modal-points li:before{content:"▸ ";color:var(--forest);font-weight:700}.modal-actions{flex-direction:column;gap:.75rem;display:flex}.btn-primary{background:var(--forest);color:var(--white);cursor:pointer;border:none;border-radius:10px;justify-content:center;align-items:center;padding:.8rem 1.5rem;font-family:Noto Sans JP,sans-serif;font-size:.95rem;font-weight:500;transition:background .15s;display:inline-flex}.btn-primary:hover{background:var(--forest-dark)}.btn-secondary{color:var(--text-muted);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:10px;justify-content:center;align-items:center;padding:.8rem 1.5rem;font-family:Noto Sans JP,sans-serif;font-size:.9rem;transition:background .15s;display:inline-flex}.btn-secondary:hover{background:var(--white)}.quiz-panel{margin-top:1rem}.quiz-progress{color:var(--text-muted);font-variant-numeric:tabular-nums;margin-bottom:.75rem;font-size:.8rem}.quiz-question{margin-bottom:1rem;font-size:1.05rem;font-weight:600;line-height:1.5}.quiz-choices{flex-direction:column;gap:.5rem;display:flex}.quiz-choice{background:var(--white);border:2px solid var(--border);cursor:pointer;text-align:left;border-radius:10px;align-items:center;gap:.75rem;width:100%;padding:.75rem 1rem;font-family:Noto Sans JP,sans-serif;font-size:.9rem;transition:border-color .15s,background .15s;display:flex}.quiz-choice:hover:not(.correct):not(.wrong){border-color:var(--forest-light);background:var(--bg-hover)}.quiz-choice .choice-letter{background:var(--bg);width:28px;height:28px;color:var(--text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.8rem;font-weight:600;display:flex}.quiz-choice.correct{border-color:var(--correct);background:var(--correct-bg)}.quiz-choice.correct .choice-letter{background:var(--correct);color:var(--white)}.quiz-choice.wrong{border-color:var(--wrong);background:var(--wrong-bg)}.quiz-choice.wrong .choice-letter{background:var(--wrong);color:var(--white)}.quiz-feedback{border-radius:10px;flex-direction:column;gap:.75rem;margin-top:1rem;padding:1rem;display:flex}.quiz-feedback.correct{background:var(--correct-bg);border:1px solid var(--correct-border)}.quiz-feedback.wrong{background:var(--wrong-bg);border:1px solid var(--wrong-border)}.quiz-feedback p{font-size:.9rem;font-weight:500}.quiz-result{text-align:center;padding:2rem 1rem}.quiz-result-icon{margin-bottom:.75rem;font-size:3rem}.quiz-result h3{margin-bottom:.5rem;font-size:1.25rem;font-weight:700}.quiz-result p{color:var(--text-muted);margin-bottom:1.5rem;font-size:.9rem}.roadmap-footer{text-align:center;max-width:800px;margin:0 auto;padding:2rem 1.25rem 3rem}.roadmap-footer p{color:var(--text-muted);max-width:480px;margin:0 auto;font-size:.85rem;font-style:italic;line-height:1.7}.app-shell{flex-direction:column;min-height:100dvh;display:flex}.tab-content{flex:1;padding-bottom:64px}.bottom-tabs{z-index:150;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--border);padding:.35rem 0 env(safe-area-inset-bottom,.35rem);background:#f5f0e6f2;display:flex;position:fixed;bottom:0;left:0;right:0}.tab-btn{cursor:pointer;color:var(--text-muted);background:0 0;border:none;flex-direction:column;flex:1;align-items:center;gap:.15rem;min-height:44px;padding:.45rem 0;font-family:Noto Sans JP,sans-serif;font-size:.7rem;transition:color .15s;display:flex}.tab-btn.active{color:var(--forest)}.tab-btn:focus-visible{outline:2px solid var(--forest);outline-offset:-2px;border-radius:4px}.tab-btn svg{flex-shrink:0}.textbook{background:var(--bg)}.tb-chapter-count{color:var(--text-muted);background:var(--bg);border-radius:10px;padding:.2rem .6rem;font-size:.75rem}.tb-toc{max-width:800px;margin:0 auto;padding:1rem 1.25rem 0}.tb-toc-title{color:var(--text-muted);margin-bottom:.5rem;font-size:.85rem;font-weight:500}.tb-toc-list{flex-wrap:wrap;gap:.35rem;display:flex}.tb-toc-item{background:var(--bg-card);border:1px solid var(--border);cursor:pointer;color:var(--text);border-radius:8px;align-items:center;gap:.3rem;min-height:44px;padding:.35rem .65rem;font-family:Noto Sans JP,sans-serif;font-size:.72rem;transition:background .15s,border-color .15s;display:flex}.tb-toc-item:hover{background:var(--white)}.tb-toc-item.active{border-color:var(--forest);background:var(--bg-done);font-weight:500}.tb-toc-emoji{font-size:.9rem}.tb-toc-text{white-space:nowrap}.tb-body{max-width:800px;margin:0 auto;padding:1.5rem 1.25rem 3rem}.tb-chapter{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;margin-bottom:.75rem;overflow:hidden}.tb-chapter-header{cursor:pointer;align-items:center;gap:.65rem;padding:1rem 1.25rem;transition:background .15s;display:flex}.tb-chapter-header:hover{background:var(--bg)}.tb-ch-emoji{flex-shrink:0;font-size:1.4rem}.tb-chapter-header h2{flex:1;font-size:1rem;font-weight:600}.tb-toggle{background:var(--bg);width:28px;height:28px;color:var(--text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:1.1rem;font-weight:600;transition:transform .2s;display:flex}.tb-toggle.open{background:var(--forest);color:var(--white)}.tb-chapter-content{padding:0 1.25rem 1.5rem}.tb-section{margin-bottom:1.5rem}.tb-section:last-child{margin-bottom:0}.tb-section h3{color:var(--forest-dark);border-top:1px solid var(--border);margin-bottom:.4rem;padding-top:.75rem;font-size:.95rem;font-weight:600}.tb-section:first-child h3{border-top:none;padding-top:0}.tb-section p{color:var(--text);max-width:65ch;font-size:.88rem;line-height:1.75}.tb-callout{border-left:3px solid var(--amber);color:var(--text);background:#fff8eb;border-radius:0 8px 8px 0;margin-top:.6rem;padding:.75rem 1rem;font-size:.85rem;line-height:1.6}.tb-list{flex-direction:column;gap:.35rem;margin-top:.5rem;padding-left:0;list-style:none;display:flex}.tb-list li{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:.5rem .75rem;font-size:.85rem;line-height:1.5}.tb-list li:before{content:"▸ ";color:var(--forest);font-weight:700}.tb-table-wrap{-webkit-overflow-scrolling:touch;margin-top:.6rem;overflow-x:auto}.tb-table{border-collapse:collapse;width:100%;font-size:.82rem}.tb-table th{background:var(--forest);color:var(--white);text-align:left;white-space:nowrap;padding:.5rem .65rem;font-size:.78rem;font-weight:500}.tb-table th:first-child{border-radius:6px 0 0}.tb-table th:last-child{border-radius:0 6px 0 0}.tb-table td{border-bottom:1px solid var(--border);padding:.5rem .65rem;line-height:1.4}.tb-table tr:nth-child(2n) td{background:var(--bg)}.tb-table tr:last-child td:first-child{border-radius:0 0 0 6px}.tb-table tr:last-child td:last-child{border-radius:0 0 6px}.tb-diagram{background:var(--white);border:1px solid var(--border);border-radius:10px;margin-top:.75rem;padding:1rem;overflow-x:auto}.diagram-svg{max-width:100%;height:auto;display:block}.diagram-wide{max-width:520px}.diagram-square{max-width:300px;margin:0 auto}.diagram-chord{max-width:140px}.chord-row{flex-wrap:wrap;justify-content:center;gap:.5rem;display:flex}.tb-footer{text-align:center;color:var(--text-muted);padding:2rem 1rem;font-size:.85rem;font-style:italic;line-height:1.7}.tb-table tr.highlight td{background:var(--bg-done);border-left:3px solid var(--forest);font-weight:500}.tb-table tr.highlight-amber td{border-left:3px solid var(--amber);background:#fff8eb;font-weight:500}.tb-table tr.highlight-red td{background:var(--wrong-bg);border-left:3px solid var(--wrong);font-weight:500}.tb-unlock{background:var(--bg-done);border-left:3px solid var(--forest);border-radius:0 8px 8px 0;margin-top:.6rem;padding:.75rem 1rem;font-size:.84rem;line-height:1.6}.tb-unlock-title{color:var(--forest-dark);margin-bottom:.25rem;font-size:.8rem;font-weight:700}.tb-quiz-btn{background:var(--forest);color:var(--white);cursor:pointer;border:none;border-radius:8px;align-items:center;gap:.3rem;margin-top:.6rem;padding:.5rem .85rem;font-family:Noto Sans JP,sans-serif;font-size:.8rem;font-weight:500;transition:background .15s;display:inline-flex}.tb-quiz-btn:hover{background:var(--forest-dark)}.tb-unlock .tb-quiz-btn{margin-top:.5rem;display:block}@media (width<=480px){.header-inner{flex-direction:column;align-items:flex-start;gap:.5rem;padding:.6rem 1rem}.progress-bar-wrap{width:100%}.progress-track{flex:1;width:100%}.stage-card{padding:1.25rem 1rem}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:.5rem}.modal-content{border-radius:16px;max-height:85vh;padding:1.5rem 1.25rem}.modal-header h2{font-size:1.05rem}.logo-text h1{font-size:.9rem}.tb-toc{padding:.75rem .75rem 0}.tb-toc-list{gap:.25rem}.tb-toc-item{min-height:36px;padding:.3rem .5rem;font-size:.65rem}.tb-toc-text{white-space:normal;line-height:1.2}.tb-toc-emoji{font-size:.8rem}.tb-body{padding:1rem .75rem 3rem}.tb-chapter-header{gap:.5rem;padding:.75rem .85rem}.tb-chapter-header h2{font-size:.88rem}.tb-ch-emoji{font-size:1.1rem}.tb-chapter-content{padding:0 .85rem 1.25rem}.tb-section h3{font-size:.88rem}.tb-section p{font-size:.82rem}.tb-table{font-size:.72rem}.tb-table th{padding:.4rem;font-size:.68rem}.tb-table td{padding:.4rem;font-size:.72rem}.tb-callout,.tb-unlock{padding:.6rem .75rem;font-size:.78rem}.tb-list li{padding:.4rem .6rem;font-size:.78rem}.tb-diagram{padding:.5rem}.diagram-square{max-width:240px}.chord-row{gap:.25rem}.diagram-chord{max-width:105px}}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}