.page-main{padding:72px 0 96px}.page-header{max-width:680px;margin-bottom:2.5rem}.page-header h1{font-size:clamp(1.75rem,3.5vw,2.75rem);margin-bottom:1rem}.page-intro{font-size:.95rem;color:var(--text-muted);line-height:1.7}.back-link{font-size:.82rem;color:var(--text-muted);text-decoration:none;display:inline-block;margin-bottom:.75rem}.back-link:hover{color:var(--accent)}.mode-bar{display:flex;align-items:center;gap:1.5rem;margin-bottom:1.5rem}.mode-toggle{display:flex;gap:.5rem}.mode-btn{padding:.45rem 1.1rem;font-size:.85rem;font-weight:500;border:1.5px solid var(--border);background:var(--white);border-radius:999px;cursor:pointer;color:var(--text-muted);transition:all .15s}.mode-btn.active{border-color:var(--accent);color:var(--accent);background:#fdf8f4}.quiz-score{font-size:.85rem;color:var(--text-muted)}.quiz-prompt{display:flex;align-items:center;gap:.75rem;font-size:1rem;color:var(--text-muted);margin-bottom:1.25rem;padding:.75rem 1.25rem;background:#fffbf7;border:1px solid #e8d5b7;border-radius:8px}.quiz-prompt strong{font-size:1.75rem;color:var(--text);font-family:Archivo Narrow,sans-serif}.fingerboard-wrap{overflow-x:auto;margin-bottom:1.5rem}.fingerboard{display:grid;grid-template-rows:auto repeat(4,1fr) auto;gap:0;min-width:520px;background:#2a1f14;border-radius:10px;padding:1rem 1.5rem;border:3px solid #6b4c2a}.fb-header,.fb-footer,.string-row{display:grid;grid-template-columns:40px repeat(5,1fr);gap:.4rem;align-items:center}.fb-header{margin-bottom:.5rem}.fb-footer{margin-top:.5rem}.pos-label,.finger-num{text-align:center;font-size:.7rem;color:#b8956e;font-weight:600;text-transform:uppercase;letter-spacing:.06em}.string-label{font-family:Archivo Narrow,sans-serif;font-size:1.1rem;font-weight:700;color:#e8c89a;text-align:center;width:40px}.string-row{padding:.35rem 0;border-bottom:1px solid rgba(255,255,255,.06);position:relative}.string-row:after{content:"";position:absolute;left:45px;right:0;top:50%;height:1.5px;background:#c8a0644d;pointer-events:none;z-index:0}.string-row:last-of-type{border-bottom:none}.fret-btn:nth-child(2){position:relative}.fret-btn:nth-child(2):before{content:"";position:absolute;right:-.2rem;top:5%;height:90%;width:3px;background:#c8a464;border-radius:2px;pointer-events:none}.fret-btn{position:relative;z-index:1;width:100%;aspect-ratio:1;max-width:64px;justify-self:center;border-radius:50%;border:2px solid rgba(200,160,100,.4);background:#ffffff12;color:#e8c89a;font-size:.72rem;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s,transform .1s;display:flex;align-items:center;justify-content:center;font-family:Archivo Narrow,sans-serif}.fret-btn:hover:not(:disabled){background:var(--accent);border-color:var(--accent);color:#fff;transform:scale(1.1)}.fret-btn.active{background:var(--accent);border-color:var(--accent);color:#fff;transform:scale(1.08)}.fret-btn.quiz-correct{background:#10b981;border-color:#10b981;color:#fff;transform:scale(1.1)}.fret-btn.quiz-wrong{background:#ef4444;border-color:#ef4444;color:#fff}.fret-btn.quiz-show{background:#10b981;border-color:#10b981;color:#fff;animation:pulse .5s ease}.fret-btn:disabled{cursor:default}.fingerboard.quiz-mode .fret-btn:not(.quiz-correct):not(.quiz-wrong):not(.quiz-show){color:transparent}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.15)}to{transform:scale(1.08)}}.info-panel{display:flex;align-items:center;gap:1.25rem;padding:1rem 1.5rem;background:var(--white);border:1px solid var(--border);border-radius:8px;margin-bottom:3rem}.info-note{font-family:Archivo Narrow,sans-serif;font-size:2rem;font-weight:700;color:var(--accent);min-width:60px}.info-details{font-size:.9rem;color:var(--text-muted)}.feedback{min-height:1.75rem;font-size:.9rem;font-weight:500;border-radius:6px;padding:.5rem 1.25rem;margin-bottom:2rem;text-align:center}.feedback.correct{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}.feedback.wrong{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.reference-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.ref-card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:1.75rem}.ref-card h3{font-size:1rem;margin-bottom:.75rem}.ref-card p{font-size:.88rem;color:var(--text-muted);line-height:1.6;margin-bottom:.75rem}.ref-card ul{list-style:none;display:flex;flex-direction:column;gap:.3rem}.ref-card li{font-size:.85rem;color:var(--text-muted);padding-left:1rem;position:relative}.ref-card li:before{content:"→";position:absolute;left:0;color:var(--accent)}.open-strings{display:flex;flex-direction:column;gap:.5rem;margin-top:.5rem}.os-row{display:grid;grid-template-columns:36px 60px 1fr;gap:.5rem;align-items:baseline}.os-name{font-family:Archivo Narrow,sans-serif;font-weight:700;font-size:1rem;color:var(--accent)}.os-freq{font-size:.75rem;color:var(--text-muted);font-variant-numeric:tabular-nums}.os-desc{font-size:.82rem;color:var(--text-muted)}@media(max-width:700px){.reference-grid{grid-template-columns:1fr}.fingerboard{padding:.75rem}.fret-btn{font-size:.65rem}}