:root{color-scheme:dark;--bg:#151323;--text:#eae7de;--muted:#8d939e;--line:#ffffff13;--gold:#e6c9a2;--left:#83d3df;--surface:#16191fe8;--glass:#191d2370;--font:Inter,-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif}*{box-sizing:border-box}body{margin:0;overflow:hidden;background:var(--bg);color:var(--text);font:13px var(--font);overscroll-behavior:none}button,input,a{-webkit-tap-highlight-color:transparent}button{color:inherit;font:inherit;cursor:pointer;background:none;border:0;touch-action:manipulation}button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--gold);outline-offset:4px}button:disabled{opacity:.3;cursor:default}button:hover{color:#fff}svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.55;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.svg-defs{position:absolute;width:0;height:0;overflow:hidden}[hidden]{display:none!important}#stage{position:fixed;inset:0;width:100%;height:var(--ui-h,100dvh);background:radial-gradient(ellipse at 19% 32%,#4f375537 0,transparent 48%),radial-gradient(ellipse at 82% 40%,#254d6530 0,transparent 44%),linear-gradient(165deg,#171525 0%,#282232 58%,#111c29 100%)}#scene,#labels,.stage-vignette{position:absolute;inset:0;width:100%;height:100%;display:block}#scene{touch-action:none}#scene canvas{display:block;width:100%;height:100%}#labels{pointer-events:none;z-index:2}.stage-vignette{background:linear-gradient(180deg,#06080b55,transparent 23%,transparent 74%,#06080b99);pointer-events:none;z-index:1}.glass{background:var(--glass);border:1px solid var(--line);box-shadow:0 8px 40px #00000018;backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px)}.topbar{position:absolute;top:max(20px,env(safe-area-inset-top));left:max(28px,env(safe-area-inset-left));right:max(28px,env(safe-area-inset-right));display:flex;align-items:center;justify-content:space-between;z-index:4;pointer-events:none}.topbar>*{pointer-events:auto}.song-pill{height:39px;display:flex;align-items:center;gap:12px;padding:0 14px;border-radius:22px;font-size:12px;letter-spacing:1px}.song-pill svg{width:14px;color:var(--muted)}.playing-dot{height:5px;width:5px;border-radius:50%;background:var(--muted)}.playing .playing-dot{background:var(--gold);box-shadow:0 0 10px #dfbc8040}.instrument-switch{display:flex;align-items:center;padding:3px;border-radius:24px;gap:3px;position:absolute;left:50%;transform:translateX(-50%)}.instrument-switch button{display:flex;align-items:center;gap:7px;padding:7px 14px;border-radius:20px;font-size:11px;letter-spacing:1px;color:var(--muted);transition:background .25s,color .25s}.instrument-switch button svg{width:16px;height:16px}.instrument-switch button.active{color:var(--gold);background:#dfbc8012}.icon-button{width:34px;height:34px;display:inline-flex;justify-content:center;align-items:center;border-radius:50%;flex-shrink:0;color:var(--muted);transition:background .2s,color .2s}.icon-button:hover{background:#ffffff08;color:var(--text)}.menu-button{width:39px;height:39px}.menu-button svg{width:17px}.learning-status{position:absolute;left:32px;top:85px;display:flex;align-items:center;gap:15px;font-size:9px;letter-spacing:.5px;color:var(--muted);z-index:2;pointer-events:none}.hand-legend{display:flex;align-items:center;gap:6px}.hand-legend:before{content:'';width:5px;height:5px;border-radius:50%;background:currentColor}.left-hand{color:var(--left)}.right-hand{color:var(--gold)}.bar-count{font:10px var(--font);font-variant-numeric:tabular-nums;letter-spacing:1px;margin-left:6px;color:#777d86}.note-readout{position:absolute;top:85px;right:32px;z-index:2;display:flex;gap:12px;align-items:center;max-width:50%;justify-content:flex-end;pointer-events:none}.readout-hand{font-size:10px;color:var(--muted);display:flex;gap:7px;align-items:center}.readout-hand b{font-weight:400;font-size:11px;color:var(--gold);font-variant-numeric:tabular-nums}.readout-hand.left b{color:var(--left)}.readout-hand small{font-size:9px;color:var(--muted)}.transport{position:absolute;bottom:max(20px,env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);width:min(500px,calc(100% - 48px));border-radius:19px;padding:0 13px 7px;z-index:5;overflow:hidden}.timeline{height:12px;position:relative;display:flex;align-items:flex-start}.timeline input{position:absolute;top:0;left:-13px;width:calc(100% + 26px);margin:0;height:3px;border-radius:0;z-index:2}.timeline input::-webkit-slider-thumb{width:8px;height:8px;opacity:0}.timeline input:hover::-webkit-slider-thumb{opacity:1}.transport-row{height:40px;display:flex;align-items:center;gap:10px;justify-content:center}.play-button{height:35px;width:35px;display:grid;place-items:center;border-radius:50%;background:var(--gold);color:#25201a;flex-shrink:0;transition:transform .2s}.play-button:hover{color:#15110d;transform:scale(1.05)}.play-button svg{height:18px;width:18px}.transport .icon-button{width:28px;height:30px}.transport .icon-button svg{width:16px;height:16px}.transport-time{display:flex;gap:7px;font-size:9px;font-variant-numeric:tabular-nums;color:var(--muted);margin:0 10px;white-space:nowrap}.transport-time #elapsed{color:var(--text)}.time-divider{opacity:.35}.speed-button{font-size:10px;font-variant-numeric:tabular-nums;min-width:34px;height:30px;border-radius:5px;color:var(--gold)}.speed-button:hover{background:#ffffff05}.dock-divider{height:13px;width:1px;background:var(--line);margin:0 4px}#loop-zone{position:absolute;top:0;height:3px;background:#dfbc8050;z-index:1}.unlock-button{position:absolute;left:50%;top:39%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:10px;border-radius:40px;padding:16px 23px;z-index:8;color:var(--gold);background:#16191fd9;box-shadow:0 0 50px #dfbc8010;font-size:11px;letter-spacing:2px}.unlock-button svg{width:20px;height:20px}.loading-ring{position:absolute;left:50%;top:38%;width:20px;height:20px;border-radius:50%;border:1px solid #dfbc8020;border-top-color:var(--gold);animation:spin 1s linear infinite;pointer-events:none;z-index:6}@keyframes spin{to{transform:rotate(360deg)}}.step-target{position:absolute;left:50%;top:19%;transform:translateX(-50%);font-size:11px;letter-spacing:1px;z-index:2;color:var(--gold);padding:8px 14px;border-radius:20px;background:#15191c80;pointer-events:none}
.sheet{z-index:25;position:fixed;inset:12px 12px 12px auto;margin:0;width:360px;max-width:calc(var(--ui-w,100vw) - 24px);height:calc(var(--ui-h,100dvh) - 24px);max-height:none;border:1px solid var(--line);border-radius:15px;background:var(--surface);color:var(--text);box-shadow:-20px 0 80px #0004;padding:0;backdrop-filter:blur(30px);-webkit-backdrop-filter:blur(30px);overflow:hidden}.sheet-header{height:69px;padding:14px 19px;display:flex;align-items:center;gap:7px;border-bottom:1px solid var(--line)}.sheet-header h2{font-size:14px;font-weight:500;letter-spacing:2px;margin:0;flex:1}.sheet-header .icon-button{width:30px;height:30px}.sheet-content{padding:19px 23px 28px;height:calc(100% - 69px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:#ffffff20 transparent}.menu-row{width:100%;padding:19px 0;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);text-align:left;font-size:12px;letter-spacing:1px}.menu-row>svg:first-child{color:var(--gold);width:18px}.menu-row>span{flex:1}.menu-row>svg:last-child{color:var(--muted);width:15px}.menu-row.credits-link{margin-top:26px;font-size:10px;border-bottom:0;color:var(--muted)}.filters{display:flex;gap:4px;margin-bottom:16px;padding:3px;background:#ffffff04;border-radius:7px}.filters button{font-size:10px;padding:9px 0;flex:1;border-radius:5px;color:var(--muted)}.filters button.active{color:var(--gold);background:#dfbc8012}.track-row{display:flex;align-items:center;gap:10px;padding:16px 0;border-bottom:1px solid var(--line)}.track-select{flex:1;min-width:0;display:flex;gap:13px;align-items:center;text-align:left;padding:0}.track-index{font-size:10px;color:var(--muted);font-variant-numeric:tabular-nums}.track-row.selected .track-index{color:var(--gold)}.track-name{font-size:12px;display:block;letter-spacing:.5px}.track-artist{display:block;font-size:9px;line-height:1.5;color:var(--muted);margin-top:5px}.track-duration{font-size:9px;color:var(--muted);margin-left:auto}.favorite{width:26px;height:30px}.favorite svg{height:14px;width:14px}.favorite.active{color:var(--gold)}.favorite.active svg{fill:#dfbc8030}.empty-list{color:var(--muted);font-size:11px;padding:20px 0;line-height:2}.control-label{font-size:10px;color:var(--muted);display:flex;align-items:center;justify-content:space-between;letter-spacing:1px;margin:27px 0 13px}.control-label:first-child{margin-top:5px}.control-label output{color:var(--gold);font-size:10px;letter-spacing:0}.segmented{display:flex;padding:3px;gap:3px;border:1px solid var(--line);border-radius:8px}.segmented button{font-size:11px;color:var(--muted);flex:1;padding:10px 4px;border-radius:5px}.segmented button.active{background:#dfbc8016;color:var(--gold)}.rate-options{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.rate-options button{font-size:10px;padding:10px 0;border:1px solid var(--line);border-radius:6px;font-variant-numeric:tabular-nums}.rate-options button.active{color:var(--gold);background:#dfbc8010;border-color:#dfbc8050}.text-button{font-size:9px;color:var(--muted);padding:0;letter-spacing:0}.ab-controls{display:flex;gap:8px;align-items:center}.ab-controls>button:not(.icon-button){flex:1;border:1px solid var(--line);padding:12px;text-align:left;border-radius:7px;color:var(--gold);font-size:12px}.ab-controls span{float:right;font-size:10px;font-variant-numeric:tabular-nums;color:var(--muted)}.ab-controls>.icon-button{border:1px solid var(--line);border-radius:7px;width:39px;height:40px}.ab-controls>.active{color:var(--gold);background:#dfbc8015}.setting-row{display:flex;justify-content:space-between;align-items:center;padding:19px 0;border-bottom:1px solid var(--line);font-size:11px}.toggle{width:31px;height:18px;border-radius:20px;background:#ffffff13;position:relative;padding:0;transition:background .2s}.toggle:before{content:'';height:12px;width:12px;position:absolute;left:3px;top:3px;background:var(--muted);border-radius:50%;transition:transform .2s,background .2s}.toggle.on{background:#dfbc8030}.toggle.on:before{background:var(--gold);transform:translateX(13px)}input[type=range]{appearance:none;-webkit-appearance:none;background:linear-gradient(to right,var(--gold) var(--fill,0%),#ffffff20 var(--fill,0%));height:3px;width:100%;margin:10px 0;cursor:pointer;border-radius:8px;touch-action:auto}input[type=range]::-webkit-slider-thumb{appearance:none;width:10px;height:10px;background:var(--gold);border:0;border-radius:50%}input[type=range]::-moz-range-thumb{width:10px;height:10px;border:0;background:var(--gold);border-radius:50%}.setting-note,[data-page=info] p{font-size:10px;line-height:2;color:var(--muted);margin-top:23px}.wide-button{width:100%;background:var(--gold);color:#24201b;border-radius:7px;padding:13px;font-size:11px;letter-spacing:1px;margin:17px 0 0}.wide-button:hover{color:#16120d}.wide-button.secondary{background:#ffffff05;color:var(--text);border:1px solid var(--line)}.chord-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.chord-grid button{padding:16px 0;border:1px solid var(--line);border-radius:7px;color:var(--muted);font-size:14px}.chord-grid button.active{color:var(--gold);border-color:#dfbc8060;background:#dfbc8012}#credits{font-size:9px;line-height:2;color:var(--muted);border-top:1px solid var(--line);margin-top:22px;padding-top:17px}#credits a{color:var(--gold);text-decoration:none}.toast{position:fixed;left:50%;bottom:98px;transform:translate(-50%,10px);opacity:0;pointer-events:none;z-index:40;max-width:90vw;padding:11px 17px;font-size:11px;line-height:1.6;text-align:center;background:#24282ff0;border:1px solid var(--line);border-radius:9px;transition:opacity .25s,transform .25s}.toast.show{opacity:1;transform:translate(-50%,0)}
body.light{--bg:#d9d8d2;--text:#30322e;--muted:#777b76;--line:#00000012;--gold:#9a7844;--left:#477f9a;--surface:#f1f0eaef;--glass:#f4f3eb77;color-scheme:light}body.light #stage{background:radial-gradient(ellipse at 50% 70%,#f1efea,transparent 65%),var(--bg)}body.light .stage-vignette{background:linear-gradient(180deg,#d9d8d255,transparent 25%,transparent 70%,#c4c6c280)}body.light .unlock-button{background:#f0eee6df}body.light .toast{background:#e8e5dcf5}body.light .step-target{background:#e7e4dc9f}
@media(max-height:600px) and (orientation:landscape){.topbar{top:max(11px,env(safe-area-inset-top));left:max(18px,env(safe-area-inset-left));right:max(18px,env(safe-area-inset-right))}.song-pill{height:32px;padding:0 12px;font-size:10px;gap:9px}.menu-button{width:32px;height:32px}.instrument-switch{padding:2px}.instrument-switch button{padding:5px 12px;font-size:10px}.instrument-switch button svg{width:14px;height:14px}.learning-status{left:22px;top:57px;font-size:8px;gap:12px}.bar-count{font-size:8px}.note-readout{right:22px;top:57px;gap:9px}.readout-hand,.readout-hand b{font-size:9px}.readout-hand small{font-size:8px}.transport{bottom:max(10px,env(safe-area-inset-bottom));width:385px;padding:0 9px 4px;border-radius:13px}.timeline{height:8px}.timeline input{left:-9px;width:calc(100% + 18px)}.transport-row{height:32px;gap:7px}.play-button{width:29px;height:29px}.play-button svg{width:16px}.transport-time{font-size:8px;margin:0 5px}.transport .icon-button{height:27px;width:25px}.speed-button{font-size:9px;min-width:30px}.dock-divider{margin:0}.unlock-button{top:38%;padding:12px 18px;font-size:10px}.toast{bottom:68px;font-size:10px;padding:8px 13px}.sheet{inset:7px 7px 7px auto;height:calc(var(--ui-h,100dvh) - 14px);width:330px}.sheet-header{height:52px;padding:10px 17px}.sheet-content{height:calc(100% - 52px);padding:15px 21px}.sheet-header h2{font-size:12px}.menu-row{padding:14px 0}.control-label{margin-top:23px}.step-target{top:20%;font-size:9px;padding:6px 11px}}
@media(max-width:600px) and (orientation:portrait){.topbar{top:max(17px,env(safe-area-inset-top));left:16px;right:16px}.song-pill{padding:0 10px;gap:7px;font-size:11px;height:35px}.song-pill .playing-dot{display:none}.instrument-switch{left:auto;right:46px;transform:none}.instrument-switch button{padding:7px 10px;gap:5px;font-size:10px}.instrument-switch button svg{width:14px;height:14px}.menu-button{height:35px;width:35px}.learning-status{top:77px;left:20px;gap:11px;font-size:8px}.bar-count{font-size:9px}.note-readout{top:108px;left:20px;right:20px;max-width:100%;justify-content:center;flex-wrap:wrap;gap:8px}.readout-hand b{font-size:10px}.transport{width:calc(100% - 30px);bottom:max(18px,env(safe-area-inset-bottom));padding-left:8px;padding-right:8px}.transport-row{gap:6px}.transport-time{font-size:8px;margin:0 5px}.dock-divider{margin:0}.transport .icon-button{width:25px}.sheet{inset:8px 8px 8px auto;width:calc(var(--ui-w,100vw) - 16px);max-width:none;height:calc(var(--ui-h,100dvh) - 16px)}.step-target{top:23%}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}
#app-shell{position:fixed;left:0;top:0;width:100%;height:100%;overflow:hidden;isolation:isolate}.landscape-rotated #app-shell{left:100%;top:0;transform:rotate(90deg);transform-origin:top left}.sheet-shade{position:absolute;inset:0;background:#0c0c1b60;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);z-index:20}.sheet{display:none}.sheet[open]{display:block}.stage-atmosphere{position:absolute;inset:0;pointer-events:none;overflow:hidden;z-index:0}.stage-atmosphere:before{content:'';position:absolute;left:19%;right:19%;top:17%;height:37%;border-radius:50%;background:radial-gradient(ellipse,#c6b1eb0d 0%,#d2b7ab05 44%,transparent 70%);filter:blur(25px)}.stage-atmosphere i{position:absolute;display:block;border-radius:50%;filter:blur(17px);background:#d9b9e41c;width:90px;height:90px;top:15%;left:16%;animation:breathe 12s ease-in-out infinite alternate}.stage-atmosphere i:nth-child(2){left:80%;top:29%;width:65px;height:65px;background:#9cd7e31b;animation-delay:-5s}.stage-atmosphere i:nth-child(3){left:59%;top:10%;width:32px;height:32px;filter:blur(12px);background:#f2ccae24;animation-delay:-8s}@keyframes breathe{to{opacity:.35;transform:translateY(-12px) scale(1.2)}}.glass{border-color:#f9d3d71c;background:linear-gradient(135deg,#d5b8eb13,#11192588);box-shadow:0 8px 35px #070b181f,inset 0 1px 0 #fff1}.play-button{background:linear-gradient(140deg,#f7dfbd,#e7b9a4);box-shadow:0 3px 12px #d8ac8330,inset 0 1px 0 #fff9}.play-button:active{transform:scale(.96)}.instrument-switch button.active{background:linear-gradient(135deg,#e3c7e21e,#ead0b714);box-shadow:inset 0 0 0 1px #f0c6c110;color:#f2d1bb}.right-hand{color:#efbdab}.readout-hand b{color:#efbdab}.sheet{background:linear-gradient(150deg,#252130ed,#151c28f5);border-color:#e8cae122}.timeline input{background:linear-gradient(to right,#b0dfec 0%,#edc2c0 var(--fill,0%),#ffffff15 var(--fill,0%))}.setting-row .toggle.on{background:#e3b9cc33}.toggle.on:before{background:#efcdb4}.light .stage-atmosphere{opacity:.65}.light .sheet{background:#f1eee9f5}.light .glass{background:#f8f4ee80}.light .instrument-switch button.active{color:#8c624c}.light .readout-hand b{color:#9a6e4b}.light .readout-hand.left b{color:#447f92}
.mobile-landscape .topbar{top:11px;left:20px;right:20px}.mobile-landscape .song-pill{height:32px;padding:0 12px;gap:9px;font-size:10px}.mobile-landscape .song-pill .playing-dot{display:block}.mobile-landscape .instrument-switch{left:50%;right:auto;transform:translateX(-50%);padding:2px}.mobile-landscape .instrument-switch button{padding:5px 12px;font-size:10px}.mobile-landscape .menu-button{width:32px;height:32px}.mobile-landscape .learning-status{left:22px;top:57px;font-size:8px;gap:12px}.mobile-landscape .bar-count{font-size:8px}.mobile-landscape .note-readout{top:57px;left:auto;right:22px;max-width:50%;justify-content:flex-end;flex-wrap:nowrap;gap:9px}.mobile-landscape .readout-hand,.mobile-landscape .readout-hand b{font-size:9px}.mobile-landscape .readout-hand small{font-size:8px}.mobile-landscape .transport{bottom:10px;width:385px;padding:0 9px 4px;border-radius:15px}.mobile-landscape .timeline{height:8px}.mobile-landscape .timeline input{left:-9px;width:calc(100% + 18px)}.mobile-landscape .transport-row{height:32px;gap:7px}.mobile-landscape .play-button{height:29px;width:29px}.mobile-landscape .transport-time{font-size:8px;margin:0 5px}.mobile-landscape .transport .icon-button{height:27px;width:25px}.mobile-landscape .speed-button{font-size:9px;min-width:30px}.mobile-landscape .dock-divider{margin:0}.mobile-landscape .sheet{inset:7px 7px 7px auto;width:330px;max-width:calc(var(--ui-w) - 14px);height:calc(var(--ui-h) - 14px)}.mobile-landscape .sheet-header{height:52px;padding:10px 17px}.mobile-landscape .sheet-content{height:calc(100% - 52px);padding:15px 21px}.mobile-landscape .sheet-header h2{font-size:12px}.mobile-landscape .menu-row{padding:14px 0}.mobile-landscape .unlock-button{top:38%;padding:12px 18px;font-size:10px}.mobile-landscape .step-target{top:20%;font-size:9px;padding:6px 11px}.mobile-landscape .toast{bottom:68px;font-size:10px;padding:8px 13px}.landscape-rotated .topbar{left:max(20px,env(safe-area-inset-top));right:max(20px,env(safe-area-inset-bottom))}
#scene{z-index:1}#labels{z-index:3}.stage-vignette{z-index:2}.stage-atmosphere{z-index:0}.topbar{z-index:5}.transport{z-index:6}.learning-status,.note-readout,.step-target{z-index:4}
.stage-atmosphere:after{content:'';position:absolute;inset:0;opacity:.22;background:radial-gradient(circle at 12% 19%,#ead2e9 0 1px,transparent 2px),radial-gradient(circle at 29% 12%,#e7cedd 0 1px,transparent 2px),radial-gradient(circle at 42% 24%,#d8d1ed 0 .7px,transparent 1.5px),radial-gradient(circle at 67% 16%,#e8d8b3 0 .8px,transparent 1.8px),radial-gradient(circle at 83% 20%,#a9dce8 0 1px,transparent 2px),radial-gradient(circle at 91% 35%,#c5daec 0 .8px,transparent 1.8px)}

[data-page="keyboard"] h3{font-size:13px;font-weight:500;margin:25px 0 10px;color:var(--text)}.keymap-octave{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px;margin:10px 0;padding:10px 5px;background:#8993b008;border:1px solid #bcaeac1c;border-radius:10px}.keymap-octave>div{display:flex;align-items:center;flex-direction:column;gap:5px}.keymap-octave small{font-size:8px;opacity:.6}.keymap-octave kbd{font-family:ui-monospace,monospace;font-size:12px;min-width:22px;text-align:center;padding:4px 2px;border:1px solid #ddc4a94a;border-radius:5px;background:linear-gradient(145deg,#d9bca521,#666c7d08);box-shadow:0 2px 0 #0002}.keymap-octave .sharp{font-size:10px;opacity:.7}.keyboard-source{font-size:11px;color:#b39b85;display:inline-block;margin:12px 0;text-decoration:none}.keymap-string{padding:12px 0;border-bottom:1px solid #9b94a322;display:grid;gap:7px}.keymap-string b{font-size:12px;font-weight:500}.keymap-string b small{margin-left:8px;font-size:10px}.keymap-string code{font-family:ui-monospace,monospace;font-size:12px;letter-spacing:.5px;word-break:break-all;color:#c8ae95}.keymap-string>small{font-size:9px;opacity:.5}.fret-offset-control{display:flex;align-items:center;gap:7px;font-size:11px;margin:15px 0}.fret-offset-control span{margin-right:auto}.fret-offset-control b{font-weight:500;margin-left:12px}.fret-offset-control button{width:30px;height:30px;border:1px solid #cfb8a02b;border-radius:8px;background:#9b94a310;color:inherit;cursor:pointer}.fret-offset-control button:disabled{opacity:.3;cursor:default}.light .keymap-string code,.light .keyboard-source{color:#765c43}

.about-entry{margin-top:23px;border-top:1px solid var(--line);border-bottom:0;padding:18px 0;min-height:65px}.about-entry small{display:block;margin-top:7px;font-size:10px;letter-spacing:0;color:var(--muted)}.beginner-guide{font-size:13px;line-height:1.95;overflow-wrap:anywhere}.guide-intro{padding:5px 0 20px}.guide-intro>span{font-size:9px;letter-spacing:2px;color:var(--gold)}.guide-intro h3{margin:10px 0;font-weight:500;font-size:22px;letter-spacing:1px}.beginner-guide p{margin:12px 0;color:var(--text);opacity:.87}.guide-intro p{color:var(--muted);font-size:12px}.guide-chapter{border-top:1px solid var(--line)}.guide-chapter>summary{display:flex;align-items:center;gap:11px;padding:18px 0;cursor:pointer;list-style:none;min-height:58px;font-size:13px;line-height:1.6}.guide-chapter>summary::-webkit-details-marker{display:none}.guide-chapter>summary:after{content:'+';margin-left:auto;flex-shrink:0;font-size:18px;font-weight:300;color:var(--gold)}.guide-chapter[open]>summary:after{content:'−'}.guide-chapter>summary:focus-visible{outline:2px solid var(--gold);outline-offset:-2px;border-radius:6px}.guide-number{font-size:10px;color:var(--gold);font-variant-numeric:tabular-nums;opacity:.75}.guide-body{padding:0 0 20px}.guide-body strong{font-weight:500;color:var(--gold)}.guide-body ol{padding-left:21px;margin:0}.guide-body li{padding-left:3px;margin:0 0 14px;color:var(--text);opacity:.9}.guide-body .guide-tip{padding:12px 14px;border-left:2px solid #d9baa477;border-radius:0 7px 7px 0;background:#bca1ba0b;font-size:12px;line-height:1.9;opacity:1}.guide-example{display:grid;gap:8px;padding:14px;border:1px solid var(--line);border-radius:9px;background:#bca1ba08;margin:17px 0}.guide-example b{font-size:13px;font-weight:500;color:var(--gold)}.guide-example span{font-size:12px;color:var(--muted)}.guide-table-wrap{max-width:100%;overflow-x:auto}.guide-note-table{width:100%;border-collapse:collapse;margin:5px 0 14px;table-layout:fixed;font-size:11px;text-align:center}.guide-note-table caption{text-align:left;font-size:11px;color:var(--muted);padding:5px 0 9px}.guide-note-table th,.guide-note-table td{padding:8px 1px;border-bottom:1px solid var(--line);font-weight:400}.guide-note-table th:first-child{width:38px;color:var(--muted)}.guide-note-table thead{color:var(--gold)}.guide-figure{margin:19px 0;padding:13px 8px;border:1px solid var(--line);border-radius:9px;background:#8f809208;color:var(--muted)}.guide-figure svg{display:block;width:100%;height:auto;stroke-linecap:butt}.guide-figure figcaption{font-size:11px;text-align:center;margin-top:12px;line-height:1.7;color:var(--muted)}.guide-glossary{margin:0}.guide-glossary dt{font-weight:500;color:var(--gold);margin-top:19px}.guide-glossary dd{margin:6px 0 0;color:var(--text);opacity:.87}.guide-actions{display:grid;gap:8px;margin-top:20px}.guide-actions .wide-button{margin:0;min-height:42px}.guide-footer{padding:20px 0 4px;border-top:1px solid var(--line)}.guide-footer p{font-size:12px;color:var(--muted)}.guide-footer .text-button{font-size:11px;min-height:36px;color:var(--gold)}.mobile-landscape .beginner-guide{font-size:13px}.mobile-landscape .guide-chapter>summary{font-size:13px;padding:16px 0}

.sound-status{display:flex;align-items:center;gap:4px;font-size:9px;white-space:nowrap;color:var(--gold)}.sound-status svg{width:15px;height:15px}.audio-blocked .transport-time{display:none}.mobile-landscape .sound-status{font-size:8px}.mobile-landscape .sound-status svg{width:12px;height:12px}

.track-search{width:100%;border:1px solid var(--line);background:#ffffff04;border-radius:9px;padding:11px 12px;margin:0 0 13px;color:var(--text);font:12px var(--font);outline:none}.track-search::placeholder{color:var(--muted)}.track-copy{min-width:0}.track-name{overflow-wrap:anywhere;line-height:1.6}.track-version{display:block;font-size:8px;line-height:1.7;margin-top:4px;color:var(--gold);opacity:.75}.track-select{gap:9px}.track-duration{flex-shrink:0;font-size:8px}.track-row{gap:5px}.filters button{font-size:9px}.track-search:focus-visible{outline:2px solid var(--gold);outline-offset:3px}

.topbar-actions{display:flex;align-items:center;gap:8px}.theme-button{width:39px;height:39px;color:var(--text)}.theme-button svg{width:17px;height:17px}.playback-mode{height:30px;min-width:58px;display:inline-flex;align-items:center;justify-content:center;gap:5px;flex-shrink:0;border-radius:7px;color:var(--muted)}.playback-mode svg{width:16px;height:16px}.playback-mode span{font-size:9px;white-space:nowrap}.playback-mode:hover{background:#ffffff08;color:var(--text)}.playback-mode[aria-pressed=true]{color:var(--gold);background:#dfbc8010}.light .theme-button:hover,.light .playback-mode:hover{color:var(--text);background:#7469540c}.mobile-landscape .theme-button{width:32px;height:32px}.mobile-landscape .playback-mode{min-width:52px;height:29px;gap:4px}.mobile-landscape .playback-mode span{font-size:8px}.mobile-landscape .playback-mode svg{width:15px;height:15px}
@media(max-height:600px) and (orientation:landscape){.theme-button{width:32px;height:32px}.playback-mode{min-width:52px;gap:4px}.playback-mode span{font-size:8px}}
@media(max-width:600px) and (orientation:portrait){.theme-button{width:35px;height:35px}.instrument-switch{right:88px}.mobile-landscape .instrument-switch{right:auto}.playback-mode{min-width:49px;gap:3px}}

.library-tools{display:grid;grid-template-columns:minmax(0,1fr) 112px;gap:8px;margin-bottom:13px}.library-tools .track-search{margin:0;min-width:0;font-size:11px}.library-tools select{width:100%;min-width:0;border:1px solid var(--line);background:var(--surface);border-radius:9px;padding:0 7px;color:var(--text);font:10px var(--font)}.library-tools select:focus-visible{outline:2px solid var(--gold);outline-offset:3px}

/* Photographic instrument room: quiet chrome, large playable surfaces. */
:root{--bg:#141719;--text:#edf0ef;--muted:#999fa2;--line:#ffffff16;--gold:#dedbd4;--left:#9bd8df;--surface:#1b1e20f5;--glass:#1c20216b}
body.light{--bg:#d7d7d3;--text:#303536;--muted:#737a7b;--line:#141c2017;--gold:#515e63;--left:#327689;--surface:#f5f5f1f5;--glass:#f3f4f08c}
#stage{background:radial-gradient(ellipse at 48% 18%,#343b3e 0,#171b1e 65%,#101315 100%)}
body.light #stage{background:radial-gradient(ellipse at 45% 15%,#f5f4f0 0,#dbddd9 60%,#bdc2c0 100%)}
.stage-atmosphere{display:none}.stage-vignette{background:linear-gradient(180deg,#090c1026,transparent 24%,transparent 76%,#06090c33)}
body.light .stage-vignette{background:linear-gradient(180deg,#ffffff18,transparent 26%,transparent 76%,#7b838b18)}
.topbar{height:38px;justify-content:flex-end;gap:12px}
.wordmark{position:absolute;left:0;font-size:13px;font-weight:400;letter-spacing:5px;color:var(--text);opacity:.8;pointer-events:none}
.song-pill{position:absolute;left:50%;transform:translateX(-50%);border:0;background:transparent;box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none;letter-spacing:2px}
.song-pill .playing-dot{display:none}.song-pill>svg{opacity:.5}
.instrument-switch{left:175px;transform:none;border-radius:24px;background:#ffffff04}
.instrument-switch button.active{color:var(--text);background:#edf0ef1c;box-shadow:inset 0 0 0 1px #ffffff0a}
.instrument-switch button{padding:7px 12px;gap:6px}
.theme-button,.menu-button{background:transparent;border-color:transparent;box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}
.learning-status,.note-readout{opacity:.86}.right-hand{color:#e5bdb0}.readout-hand b{color:#e5bdb0}.light .right-hand,.light .readout-hand b{color:#8d5950}
.glass{box-shadow:0 10px 35px #00000015;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}
.transport{border-radius:17px;padding:8px 15px 6px;border:1px solid #ffffff16;background:#2025278c;box-shadow:0 12px 36px #0003}
body.light .transport{border-color:#ffffff88;background:#edf0eb9c;box-shadow:0 12px 36px #2931361a}
.transport .timeline{height:8px}.transport .timeline input{left:0;width:100%;border-radius:3px;height:2px}
.play-button{background:#e9edeb1a;color:#f5f6f4;box-shadow:inset 0 0 0 1px #ffffff0c}.play-button:hover{color:white;background:#e9edeb26}
body.light .play-button{color:#313a3e;background:#252e3511;box-shadow:inset 0 0 0 1px #252e350a}
.speed-button{color:var(--text)}.playing .playing-dot{background:#cfd8d8;box-shadow:none}
body.light .instrument-switch{background:#343c4507}.light .instrument-switch button.active{background:#ffffffb3;box-shadow:0 2px 6px #1820260a}
@media(max-height:600px) and (orientation:landscape){
 .topbar{height:32px;top:max(10px,env(safe-area-inset-top));left:max(18px,env(safe-area-inset-left));right:max(14px,env(safe-area-inset-right))}
 .wordmark{font-size:10px;letter-spacing:3px}.instrument-switch{left:112px;right:auto}.instrument-switch button{padding:5px 9px;gap:5px}
 .song-pill{height:32px;padding:0 7px;font-size:11px}.transport{padding:6px 12px 4px;bottom:max(9px,env(safe-area-inset-bottom));width:min(466px,calc(100% - 40px))}
 .transport .timeline{height:6px}.learning-status,.note-readout{top:54px}.transport-row{height:32px}
}
.mobile-landscape .wordmark{font-size:10px;letter-spacing:3px}.mobile-landscape .instrument-switch{left:112px;right:auto;transform:none}.mobile-landscape .song-pill{left:50%;right:auto;transform:translateX(-50%)}
.mobile-landscape .topbar{height:32px;justify-content:flex-end}.mobile-landscape .transport{padding:6px 12px 4px;width:min(466px,calc(100% - 40px))}.mobile-landscape .transport .timeline{height:6px}
@media(max-height:350px) and (orientation:landscape){.wordmark{font-size:9px;letter-spacing:2px}.instrument-switch{left:95px}.instrument-switch button{padding:5px 7px}.song-pill{font-size:10px}.learning-status,.note-readout{top:49px}}

body.light .topbar .instrument-switch button.active{color:#30383b;background:#fffffff0}body.light .topbar .instrument-switch button{color:#647075}body.light .topbar-actions .icon-button{color:#435058}body.light .topbar .song-pill{color:#30383b}body.light .play-button:hover{color:#20292d}

/* Stable landscape shell and collision-free compact phone navigation. */
#app-shell>#stage{position:absolute;inset:0;width:100%;height:100%}
.landscape-rotated #app-shell{left:var(--physical-w,100vw);top:0;transform:rotate(90deg);transform-origin:0 0}
.mobile-landscape .wordmark{display:none}
.mobile-landscape .topbar{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:12px;height:34px;left:max(16px,env(safe-area-inset-left));right:max(12px,env(safe-area-inset-right));top:max(9px,env(safe-area-inset-top))}
.mobile-landscape .topbar #song-button{position:static;left:auto;right:auto;transform:none;grid-column:1;grid-row:1;justify-self:start;min-width:0;max-width:100%;padding:0 8px;height:34px;white-space:nowrap}
.mobile-landscape #track-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.mobile-landscape .topbar .instrument-switch{position:static;left:auto;right:auto;transform:none;grid-column:2;grid-row:1;justify-self:center;padding:2px;gap:2px}
.mobile-landscape .topbar .instrument-switch button{height:30px;padding:5px 12px;white-space:nowrap}
.mobile-landscape .topbar .topbar-actions{grid-column:3;grid-row:1;gap:4px;justify-self:end}
.mobile-landscape .topbar-actions .icon-button{width:34px;height:34px}
.mobile-landscape .learning-status{top:52px;left:20px}
.mobile-landscape .note-readout{top:52px;right:18px;max-width:55%}
.landscape-rotated.mobile-landscape .topbar{left:max(16px,env(safe-area-inset-top));right:max(12px,env(safe-area-inset-bottom));top:max(9px,env(safe-area-inset-left))}

.menu-row.contact-link{margin-top:4px;text-decoration:none;color:var(--muted);font-size:11px;border-top:1px solid var(--line);border-bottom:0}.menu-row.contact-link:hover{color:var(--text)}