:root{--wood-grain-dark: #160f0c;--wood-grain-mid: #251a14;--wood-grain-light: #36241b;--wood-binding: #e8d8be;--fret-wire-base: #a0a0a0;--fret-wire-shine: #ffffff;--fret-wire-shadow: #3a3a3a;--inlay-pearl: #f3ede2;--inlay-pearl-glow: rgba(243, 237, 226, .4);--string-wound: #c5a059;--string-wound-shine: #ffd89b;--string-plain: #d4d4d8;--string-plain-shine: #ffffff;--string-vibrate-glow: rgba(255, 180, 50, .7);--note-badge-bg: rgba(20, 20, 24, .88);--note-badge-border: #ff8b3d;--note-badge-text: #ffffff;--note-badge-root-bg: #e65100;--note-active-glow: #00e5ff;--bg-app: #0e0b0a;--sidebar-bg: #181311;--sidebar-border: #2a201c;--surface-panel: #201815;--surface-panel-active: #2f231e;--accent-primary: #ff7b39;--accent-primary-hover: #ff9158;--accent-secondary: #00bcd4;--accent-active: #ffb74d;--text-primary: #f5f2ef;--text-secondary: #a99e97;--text-muted: #6b615b;--font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--touch-min-size: 48px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-pill: 9999px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 0px);--safe-right: env(safe-area-inset-right, 0px);--z-fretboard-wood: 1;--z-fretboard-frets: 2;--z-fretboard-inlays: 3;--z-fretboard-strings: 4;--z-fretboard-notes: 5;--z-fretboard-touches: 6;--z-sidebar: 10;--z-toast: 100;--z-modal: 200}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body{width:100%;height:100%;overflow:hidden;position:fixed;background-color:var(--bg-app);color:var(--text-primary);font-family:var(--font-system);font-size:14px;line-height:1.4;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;user-select:none;-webkit-user-select:none;touch-action:manipulation}button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;touch-action:manipulation}button:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}input[type=range]{-webkit-appearance:none;appearance:none;background:transparent;cursor:pointer}input[type=range]:focus{outline:none}.app-shell{display:flex;flex-direction:row;width:100vw;height:100vh;height:100dvh;overflow:hidden;position:relative;background-color:var(--bg-app)}.sidebar-strip{width:clamp(84px,24vw,120px);height:100%;flex-shrink:0;background-color:var(--sidebar-bg);border-right:1px solid var(--sidebar-border);display:flex;flex-direction:column;z-index:var(--z-sidebar);padding:calc(var(--safe-top) + 8px) 6px calc(var(--safe-bottom) + 8px) calc(var(--safe-left) + 6px);overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none}.sidebar-strip::-webkit-scrollbar{display:none}.fretboard-stage{flex:1;height:100%;position:relative;overflow:hidden;background:var(--wood-grain-dark);padding-right:var(--safe-right);touch-action:none}.toast-portal{position:fixed;top:calc(var(--safe-top) + 16px);left:50%;transform:translate(-50%);display:flex;flex-direction:column;gap:8px;z-index:var(--z-toast);pointer-events:none;width:min(90vw,360px)}.modal-portal{position:fixed;inset:0;z-index:var(--z-modal);pointer-events:none;display:grid;place-items:center}.modal-portal.is-active{pointer-events:auto}.fretboard-stage{display:flex;justify-content:flex-end;background:#110c09}.fretboard-viewport{width:100%;height:100%;position:relative;overflow:hidden;display:flex;justify-content:center}.fretboard-track{position:absolute;top:0;width:100%;height:280%;transition:transform .45s cubic-bezier(.16,1,.3,1);will-change:transform}.fretboard-wood{width:100%;height:100%;position:relative;background:repeating-linear-gradient(90deg,rgba(255,255,255,.015) 0px,transparent 2px,transparent 4px),linear-gradient(90deg,#18100d,#2a1c16,#150e0b);box-shadow:inset 4px 0 12px #0009,inset -4px 0 12px #0009;border-left:3px solid var(--wood-binding);border-right:3px solid var(--wood-binding)}.fret-wire{position:absolute;left:0;right:0;height:4px;background:linear-gradient(180deg,var(--fret-wire-shine) 0%,var(--fret-wire-base) 40%,var(--fret-wire-shadow) 100%);box-shadow:0 2px 4px #000000b3;z-index:var(--z-fretboard-frets);pointer-events:none}.fret-nut{height:10px;background:linear-gradient(180deg,#faf3e8,#d8caaf);box-shadow:0 4px 8px #000c}.fret-inlay{position:absolute;left:50%;transform:translate(-50%,-50%);width:16px;height:16px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#ffffff 0%,var(--inlay-pearl) 60%,#b8a892 100%);box-shadow:0 0 6px var(--inlay-pearl-glow),inset 0 1px 2px #0006;z-index:var(--z-fretboard-inlays);pointer-events:none}.fret-inlay-double-left{left:32%}.fret-inlay-double-right{left:68%}.fret-number-marker{position:absolute;right:6px;transform:translateY(-50%);font-size:11px;font-family:var(--font-mono);font-weight:800;color:#fff;background:#1a120ef2;border:1.5px solid var(--accent-primary);border-radius:var(--radius-pill);padding:1px 6px;box-shadow:0 2px 6px #000000d9;pointer-events:none;z-index:var(--z-fretboard-inlays)}.fret-number-marker.fret-12{border-color:gold;color:gold;box-shadow:0 0 8px #ffd70099}.guitar-string{position:absolute;top:0;bottom:0;transform:translate(-50%);z-index:var(--z-fretboard-strings);pointer-events:none;transition:filter .05s ease}.string-wound{background:repeating-linear-gradient(180deg,var(--string-wound-shine) 0px,var(--string-wound) 1.5px,#423010 3px);box-shadow:1px 0 3px #000000b3,-1px 0 2px #0006}.string-plain{background:linear-gradient(90deg,var(--string-plain-shine) 0%,var(--string-plain) 50%,#4b4b4b 100%);box-shadow:1px 0 3px #0009}.string-vibrating{animation:stringVibrate .08s infinite alternate ease-in-out;filter:drop-shadow(0 0 4px var(--string-vibrate-glow))}@keyframes stringVibrate{0%{transform:translate(calc(-50% - 1.5px))}to{transform:translate(calc(-50% + 1.5px))}}.note-badge{position:absolute;transform:translate(-50%,-50%);width:28px;height:28px;border-radius:50%;background:var(--note-badge-bg);border:1.5px solid var(--note-badge-border);color:var(--note-badge-text);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;z-index:var(--z-fretboard-notes);pointer-events:none;box-shadow:0 2px 6px #0009}.note-badge.is-root{background:var(--note-badge-root-bg);border-color:#ffd180}.note-badge.is-semitone{opacity:.82;border-color:#ff8b3d73;background:#0f0f12eb}.touch-ripple{position:absolute;transform:translate(-50%,-50%);width:52px;height:52px;border-radius:50%;border:2px solid var(--note-active-glow);background:#00e5ff40;box-shadow:0 0 16px var(--note-active-glow);pointer-events:none;z-index:var(--z-fretboard-touches);animation:ripplePop .18s ease-out}@keyframes ripplePop{0%{transform:translate(-50%,-50%) scale(.6);opacity:.5}to{transform:translate(-50%,-50%) scale(1);opacity:1}}.sidebar-content{display:flex;flex-direction:column;gap:12px;width:100%}.sidebar-logo{font-size:13px;font-weight:800;letter-spacing:.5px;text-align:center;color:var(--accent-primary);text-transform:uppercase;padding:4px 0 8px;border-bottom:1px solid var(--sidebar-border)}.control-group{display:flex;flex-direction:column;gap:6px}.control-label{font-size:10px;text-transform:uppercase;letter-spacing:.6px;color:var(--text-muted);font-weight:700;text-align:center}.btn-pill-group{display:flex;flex-direction:column;gap:4px}.btn-grid-dual{display:grid;grid-template-columns:1fr 1fr;gap:4px}.btn-ctrl{min-height:var(--touch-min-size);min-width:100%;padding:6px 4px;border-radius:var(--radius-sm);background:var(--surface-panel);border:1px solid var(--sidebar-border);color:var(--text-secondary);font-size:11px;font-weight:600;transition:all .15s ease;text-align:center}.btn-ctrl:active{transform:scale(.96)}.btn-ctrl.is-active{background:var(--accent-primary);color:#fff;border-color:var(--accent-active);box-shadow:0 0 8px #ff7b3966}.fader-box{background:var(--surface-panel);border:1px solid var(--sidebar-border);border-radius:var(--radius-sm);padding:8px 6px;display:flex;flex-direction:column;gap:4px;align-items:center}.fader-val{font-size:10px;font-family:var(--font-mono);color:var(--accent-secondary)}.range-slider{width:100%;height:24px}.range-slider::-webkit-slider-runnable-track{height:4px;background:var(--sidebar-border);border-radius:2px}.range-slider::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent-primary);margin-top:-7px;box-shadow:0 2px 4px #00000080}.help-btn{margin-top:auto;min-height:var(--touch-min-size);border:1px dashed var(--sidebar-border);border-radius:var(--radius-sm);color:var(--text-muted);font-size:13px;font-weight:700}.help-btn:hover{color:var(--text-primary);border-color:var(--text-secondary)}.toast-item{background:#1c1613f2;border:1px solid var(--accent-primary);border-radius:var(--radius-md);padding:10px 14px;color:var(--text-primary);font-size:13px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 4px 14px #000000b3;animation:toastSlideDown .25s cubic-bezier(.16,1,.3,1);pointer-events:auto}.toast-item.toast-warning{border-color:#ffb74d}.toast-item.toast-success{border-color:#66bb6a}@keyframes toastSlideDown{0%{transform:translateY(-16px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-overlay{position:absolute;inset:0;background:#0a0807bf;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .25s ease}.modal-dialog{position:relative;background:var(--surface-panel);border:1px solid var(--sidebar-border);border-radius:var(--radius-lg);padding:24px;width:min(90vw,420px);max-height:85vh;overflow-y:auto;box-shadow:0 16px 36px #000c;transform:scale(.95);opacity:0;transition:transform .25s cubic-bezier(.16,1,.3,1),opacity .25s ease;z-index:1}.modal-portal.is-active .modal-overlay{opacity:1}.modal-portal.is-active .modal-dialog{transform:scale(1);opacity:1}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.modal-title{font-size:18px;font-weight:700;color:var(--accent-primary)}.modal-close-btn{min-width:var(--touch-min-size);min-height:var(--touch-min-size);color:var(--text-secondary);font-size:20px;border-radius:50%}.modal-close-btn:hover{color:var(--text-primary)}.modal-body{font-size:13px;color:var(--text-secondary);line-height:1.6}.modal-section{margin-bottom:16px}.modal-section h4{color:var(--text-primary);font-size:14px;margin-bottom:6px}