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80%,transparent)}.course-brain.is-known .course-brainicon,.course-brain.is-known:hover .course-brainicon{color:var(--fb-color-accent-primary)}.course-node-text{flex:1;min-width:0;display:grid;gap:3px;text-align:left}.course-node-title{font-size:14.5px;font-weight:500;color:var(--fb-color-text-primary)}.course-node-lead{font-size:12px;color:var(--fb-color-text-tertiary);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-node-locked .course-node-title,.course-node-locked .course-node-lead{opacity:.55}.course-node-chev{flex:none;color:var(--fb-color-text-tertiary)}.lock-chip{flex:none;display:inline-flex;align-items:center;font-size:9px;font-weight:700;letter-spacing:.06em;padding:3px 7px;border-radius:999px;color:var(--fb-color-accent-primary);background:color-mix(in srgb,var(--fb-color-accent-primary) 12%,transparent)}@media(min-width:768px){.course-hero{padding:20px}.course-hero-titlerow strong{font-size:24px}.course-chapter h2{font-size:18px}}@media(max-width:767px){.learn-home,.tool,.lesson{padding-top:46px}}.toast{position:fixed;left:50%;transform:translate(-50%);bottom:calc(86px + env(safe-area-inset-bottom));z-index:7;max-width:min(88vw,420px);padding:10px 16px;border-radius:999px;background:var(--fb-color-bg-elevated);border:1px solid var(--fb-hairline);color:var(--fb-color-text-primary);font-size:13px;text-align:center;animation:toast-in .18s ease-out}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(8px)}to{opacity:1;transform:translate(-50%) translateY(0)}}@media(min-width:768px){.toast{bottom:28px}}.tool-shelf{display:grid;gap:10px;margin:0 0 22px}.tool-shelf-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.tool-card{font:inherit;cursor:pointer;display:grid;gap:4px;justify-items:start;text-align:left;padding:12px;background:var(--fb-color-bg-elevated);border:1px solid var(--fb-hairline);border-radius:var(--fb-radius-card);color:inherit;transition:border-color .12s ease}.tool-card:hover{border-color:color-mix(in srgb,var(--fb-color-text-tertiary) 40%,transparent)}.tool-card-tint{width:22px;height:3px;border-radius:2px}.tool-card-tint[data-pillar=notes]{background:var(--fb-color-pillar-notes)}.tool-card-tint[data-pillar=scales]{background:var(--fb-color-pillar-scales)}.tool-card-tint[data-pillar=chords]{background:var(--fb-color-pillar-chords)}.tool-card-tint[data-pillar=intervals]{background:var(--fb-color-pillar-intervals)}.tool-card-title{font-size:16px;font-weight:600}.tool-card-sub{font-size:11px;color:var(--fb-color-text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.tool{max-width:46rem;margin:0 auto}.tool-head{display:flex;align-items:center;gap:12px;padding:2px 0 6px}.tool-back{flex:none}.tool-title{flex:1;font-size:22px;font-weight:600;margin:0}.tool-iconbtn{flex:none;width:36px;height:36px;display:grid;place-items:center;background:var(--fb-color-bg-elevated);border:1px solid var(--fb-hairline);border-radius:999px;color:var(--fb-color-text-secondary);cursor:pointer}.tool-sub{font-size:13px;color:var(--fb-color-text-tertiary);margin:0 0 14px}.quiz-card{background:var(--fb-color-bg-elevated);border:1px solid color-mix(in srgb,var(--fb-color-accent-primary) 30%,transparent);border-radius:var(--fb-radius-card);padding:14px;margin:0 0 16px;display:grid;gap:12px}.quiz-card .board{margin:0}.quiz-prompt-row{display:flex;align-items:baseline;gap:12px}.quiz-prompt{margin:0;flex:1;font-size:22px}.quiz-streak{font-size:12px;font-weight:500;color:var(--fb-color-state-positive);flex:none}.quiz-found{font-size:13px;color:var(--fb-color-text-tertiary);margin:0}.quiz-pad{display:grid;gap:8px}.quiz-pad-btn{font:inherit;font-size:15px;font-weight:500;padding:10px 0;border:none;border-radius:var(--fb-radius-control);background:var(--fb-color-bg-inset);color:var(--fb-color-text-primary);cursor:pointer}.quiz-pad-btn:disabled{cursor:default}.quiz-pad-right{background:color-mix(in 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var(--fb-hairline);border-radius:var(--fb-radius-card);padding:12px;display:grid;gap:10px}.quiz-config-label{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--fb-color-text-tertiary);margin:0}.quiz-strings{display:flex;gap:6px}.quiz-chip{font:inherit;flex:1;font-size:14px;font-weight:600;padding:7px 0;border:none;border-radius:var(--fb-radius-control);background:var(--fb-color-bg-inset);color:var(--fb-color-text-secondary);cursor:pointer}.quiz-chip-on{background:var(--fb-color-accent-primary);color:var(--fb-color-bg-base)}.quiz-config-row{display:flex;align-items:center;gap:8px}.quiz-accidentals{flex:none;padding:6px 12px;border-radius:999px}.quiz-config-caption{font-size:12px;color:var(--fb-color-text-tertiary)}.quiz-config-spacer{flex:1}.quiz-segmented{display:flex;background:var(--fb-color-bg-inset);border-radius:var(--fb-radius-control);padding:2px;gap:2px}.quiz-seg{font:inherit;font-size:13px;font-weight:500;padding:5px 12px;border:none;border-radius:10px;background:none;color:var(--fb-color-text-secondary);cursor:pointer}.quiz-seg-on{background:var(--fb-color-bg-elevated);color:var(--fb-color-text-primary)}.quiz-config-hint{font-size:12px;color:var(--fb-color-text-tertiary);margin:0}.sheet-scrim{position:fixed;top:0;right:0;bottom:0;left:0;z-index:8;background:color-mix(in srgb,var(--fb-color-bg-base) 55%,transparent);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:grid;place-items:end center}.sheet{width:min(100%,46rem);max-height:82vh;overflow-y:auto;background:var(--fb-color-bg-base);border:1px solid var(--fb-hairline);border-radius:var(--fb-radius-card) var(--fb-radius-card) 0 0;padding:20px;animation:sheet-in .2s ease-out}.sheet-tall{max-height:92vh}@keyframes sheet-in{0%{transform:translateY(24px);opacity:.6}to{transform:translateY(0);opacity:1}}.sheet-title{font-size:22px;font-weight:600;margin:0 0 8px}.sheet-lead,.sheet-body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;color:var(--fb-color-text-secondary)}.atlas-rail{display:flex;gap:7px;overflow-x:auto;padding:4px 0 10px}.atlas-root{font:inherit;font-size:14px;font-weight:600;font-variant-numeric:tabular-nums;min-width:34px;padding:7px 6px;border-radius:999px;border:1px solid var(--fb-hairline);background:none;color:var(--fb-color-text-secondary);cursor:pointer;flex:none}.atlas-root-on{background:var(--fb-color-accent-primary);border-color:var(--fb-color-accent-primary);color:var(--fb-color-bg-base)}.atlas-header{display:flex;align-items:center;gap:12px;margin:0 0 12px}.atlas-scale-btn{font:inherit;flex:1;display:flex;align-items:center;gap:8px;background:none;border:none;padding:0;color:var(--fb-color-text-primary);cursor:pointer;text-align:left}.atlas-scale-name{font-family:Georgia,Times New 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12px;display:grid;gap:8px}.atlas-card-head{font-size:11px;font-weight:500;letter-spacing:.09em;text-transform:uppercase;color:var(--fb-color-text-tertiary);margin:0}.atlas-degrees{display:flex;gap:10px;flex-wrap:wrap}.atlas-degree{font-size:14px;font-weight:600;font-variant-numeric:tabular-nums}.atlas-degree-char{text-decoration:underline;text-underline-offset:3px}.atlas-steps{font-size:12px;color:var(--fb-color-text-tertiary);margin:0}.atlas-sound{font-size:13px;color:var(--fb-color-text-secondary);margin:0}.atlas-relations{padding:0;gap:0}.atlas-relation{font:inherit;display:flex;align-items:center;gap:10px;justify-content:space-between;text-align:left;font-size:13.5px;padding:11px 14px;background:none;border:none;color:var(--fb-color-text-primary);cursor:pointer}.atlas-relation+.atlas-relation{border-top:1px solid var(--fb-hairline)}.atlas-relation svg{color:var(--fb-color-accent-primary);flex:none}.atlas-chips{display:flex;gap:7px;overflow-x:auto}.atlas-chord{font:inherit;flex:none;display:grid;gap:3px;justify-items:center;padding:7px 11px;background:var(--fb-color-bg-base);border:1px solid var(--fb-hairline);border-radius:10px;cursor:pointer}.atlas-chord-numeral{font-size:11px;color:var(--fb-color-text-tertiary);font-variant-numeric:tabular-nums}.atlas-chord-name{font-size:13px;font-weight:600;color:var(--fb-color-text-primary)}.atlas-note{font-size:12px;color:var(--fb-color-text-tertiary);margin:0}.atlas-legend{display:flex;gap:14px;flex-wrap:wrap;margin:0 0 16px}.atlas-legend-item{display:inline-flex;align-items:center;gap:5px;font-size:11px;color:var(--fb-color-text-tertiary)}.atlas-legend-dot{width:7px;height:7px;border-radius:999px}.atlas-family{display:grid;gap:2px;margin:0 0 14px}.atlas-sheet-row{font:inherit;display:flex;align-items:center;gap:10px;text-align:left;padding:10px 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var(--fb-hairline);border-radius:999px;color:var(--fb-color-accent-primary);cursor:pointer}.shelf{margin-bottom:8px}.shelf-row{display:flex;align-items:center;gap:10px;padding-right:12px}.shelf-row-main{font:inherit;flex:1;min-width:0;display:flex;align-items:center;gap:10px;text-align:left;padding:12px;background:none;border:none;color:inherit;cursor:pointer}.shelf-tint{width:3px;height:18px;border-radius:2px;flex:none}.shelf-title{font-size:14.5px;font-weight:500;color:var(--fb-color-text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.shelf-zone{font:inherit;font-size:11px;font-variant-numeric:tabular-nums;padding:4px 6px;border-radius:999px;border:1px solid var(--fb-hairline);background:none;color:var(--fb-color-text-tertiary);flex:none}.shelf-zone-on{color:var(--fb-color-accent-primary);border-color:color-mix(in srgb,var(--fb-color-accent-primary) 45%,transparent)}.shelf-remove{background:none;border:none;padding:4px;color:var(--fb-color-state-negative);opacity:.7;cursor:pointer;flex:none;display:grid;place-items:center}.shelf-remove:hover{opacity:1}.preview{display:grid;gap:10px;align-content:start}.preview-pillar{display:flex;align-items:center;gap:8px;font-size:11px;font-weight:500;letter-spacing:.09em;text-transform:uppercase;margin:0}.preview-title{font-family:Georgia,Times New Roman,serif;font-style:italic;font-weight:600;font-size:26px;margin:0}.preview-card{min-height:0}.preview-prompt{font-size:20px}.preview-wall{cursor:pointer}.preview-wall .choice,.preview-wall .board-svg .tap{pointer-events:none}.preview-another{font-size:13px}.preview-body{font-size:13px;color:var(--fb-color-text-secondary);text-align:center;margin:4px 0 0}.primer-chip{font:inherit;flex:none;display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:500;padding:6px 12px;border-radius:999px;border:1px solid color-mix(in 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li{min-width:34px;text-align:center;font-size:12px;font-variant-numeric:tabular-nums;color:var(--fb-color-text-tertiary);padding:4px 4px 6px;border-bottom:1px solid var(--fb-hairline)}.changes-bar-now{color:var(--fb-color-text-primary);border-bottom:3px solid var(--fb-color-accent-primary)!important;font-weight:600}.changes-chord{font-family:Georgia,Times New Roman,serif;font-style:italic;font-weight:600;font-size:40px;color:var(--fb-color-accent-primary);margin:0;display:flex;align-items:baseline;gap:14px}.changes-next{font-size:13px;font-style:normal;font-weight:400;color:var(--fb-color-text-secondary)}.changes-ready{font-family:Georgia,Times New Roman,serif;font-style:italic;font-weight:600;font-size:22px;text-align:center;margin:12px 0}.changes .board{margin:0}.changes-go{text-align:center}.changes-done{text-align:center;padding-top:40px}.changes-score{font-family:Georgia,Times New 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var(--fb-hairline);border-radius:var(--fb-radius-control);overflow:hidden}.pattern-gridline{position:absolute;top:0;bottom:0;width:1px;background:var(--fb-hairline)}.pattern-event{position:absolute;top:50%;transform:translate(3px,-50%);width:5px;height:24px;border-radius:999px;background:var(--fb-color-text-tertiary)}.pattern-event-accent{width:7px;height:34px;background:var(--fb-color-accent-primary)}.pattern-pad{font:inherit;font-size:14px;font-weight:500;height:150px;border-radius:var(--fb-radius-card);border:1px solid var(--fb-hairline);background:var(--fb-color-bg-elevated);color:var(--fb-color-text-secondary);cursor:pointer;transition:background 90ms ease}.pattern-pad-flash{background:color-mix(in srgb,var(--fb-color-accent-primary) 22%,var(--fb-color-bg-elevated))}.pattern-picking{display:grid;gap:8px}.pattern-picking .board{margin:0}.pattern-chordname{font-family:Georgia,Times New 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var(--fb-hairline);background:var(--fb-color-bg-inset);color:var(--fb-color-accent-primary)}.settings-account{display:flex;align-items:center;gap:12px;padding:14px 0}.settings-avatar{width:44px;height:44px;flex:none;display:grid;place-items:center;border-radius:999px;background:color-mix(in srgb,var(--fb-color-accent-primary) 15%,transparent);color:var(--fb-color-accent-primary);font-size:15px;font-weight:600}.settings-account-text{display:grid;gap:2px;min-width:0}.settings-account-name{font-size:15px;font-weight:500;color:var(--fb-color-text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.settings-account-email{font-size:12px;color:var(--fb-color-text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.settings-signout{font:inherit;font-size:14px;font-weight:500;padding:13px 0;background:none;border:none;color:var(--fb-color-state-negative);cursor:pointer}.settings-tier{font-size:12px;font-weight:500;padding:4px 10px;border-radius:999px;border:1px solid var(--fb-hairline);color:var(--fb-color-text-secondary)}.settings-tier-pro{color:var(--fb-color-accent-primary);border-color:var(--fb-color-accent-primary)}.settings-note{font-size:12px;color:var(--fb-color-text-tertiary);margin:0;padding:0 0 12px}.settings-milestones{display:flex;gap:10px}.settings-milestone{width:26px;height:26px;display:grid;place-items:center;border-radius:999px;border:1px solid var(--fb-hairline);font-size:9px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--fb-color-text-tertiary)}.settings-milestone-earned{background:var(--fb-color-fretboard-inlay);border-color:var(--fb-color-fretboard-inlay);color:var(--fb-color-bg-base)}.settings-version{font-size:12px;color:var(--fb-color-text-tertiary);margin:0;padding-top:6px}.feedback-thumbs{display:flex;gap:12px;margin:0 0 14px}.feedback-thumb{font:inherit;flex:1;display:grid;place-items:center;padding:18px 0;background:none;border:1px solid var(--fb-hairline);border-radius:var(--fb-radius-card);color:var(--fb-color-text-secondary);cursor:pointer}.feedback-thumb-on{background:var(--fb-color-accent-primary);border-color:var(--fb-color-accent-primary);color:var(--fb-color-bg-base)}.feedback-note{font:inherit;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;width:100%;min-height:130px;padding:10px;border-radius:var(--fb-radius-card);border:1px solid var(--fb-hairline);background:var(--fb-color-bg-elevated);color:var(--fb-color-text-primary);resize:vertical;margin:4px 0 10px;box-sizing:border-box}.feedback-actions{display:flex;justify-content:space-between;align-items:center;margin:0}.trends{max-width:46rem;margin:0 auto;display:grid;gap:12px}.trends .trends-card{background:var(--fb-color-bg-elevated);border:1px solid var(--fb-hairline);border-radius:var(--fb-radius-card);padding:14px;margin:0;display:grid;gap:8px}.trends .trends-card h2{font-size:11px;font-weight:500;letter-spacing:.09em;text-transform:uppercase;color:var(--fb-color-text-tertiary);margin:0}.trends-card-head{display:flex;align-items:baseline;justify-content:space-between}.trends-share{font-size:13px}.trends-banner{font:inherit;display:flex;align-items:center;gap:12px;text-align:left;padding:14px;background:var(--fb-color-bg-elevated);border:1px solid color-mix(in srgb,var(--fb-color-accent-primary) 35%,transparent);border-radius:var(--fb-radius-card);cursor:pointer}.trends-banner-text{flex:1;display:grid;gap:3px}.trends-banner-text strong{font-size:14px;color:var(--fb-color-text-primary)}.trends-banner-text span{font-size:12px;color:var(--fb-color-text-secondary)}.trends-placeholder-title{font-family:Georgia,Times New Roman,serif;font-style:italic;font-size:18px;font-weight:600;margin:0}.trends-rows{list-style:none;margin:0;padding:0;display:grid}.trends-row{display:flex;align-items:center;gap:10px;padding:9px 0;width:100%}.trends-rows>li+li,.trends-rows>.focus-area+.focus-area{border-top:1px solid var(--fb-hairline)}.trends-row-btn{font:inherit;background:none;border:none;text-align:left;cursor:pointer;color:inherit;padding:9px 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