:root{--font-display: "Spectral", "Segoe UI", Georgia, serif;--acc-header-h: 34px;--md-state-hover: .08;--md-state-focus: .12;--md-state-press: .14;--md-ease-standard: cubic-bezier(.2, 0, 0, 1);--md-dur: .15s;--md-corner-sm: 8px;--md-corner-md: 12px;--md-corner-full: 999px;--md-type-display-font: var(--font-display);--md-type-display-size: 1.6rem;--md-type-display-line: 1.9rem;--md-type-display-weight: 700;--md-type-display-tracking: .005em;--md-type-headline-font: var(--font-display);--md-type-headline-size: 1.35rem;--md-type-headline-line: 1.6rem;--md-type-headline-weight: 700;--md-type-headline-tracking: .01em;--md-type-title-large-font: var(--font-display);--md-type-title-large-size: 1.15rem;--md-type-title-large-line: 1.4rem;--md-type-title-large-weight: 700;--md-type-title-large-tracking: .02em;--md-type-title-size: .92rem;--md-type-title-line: 1.2rem;--md-type-title-weight: 600;--md-type-title-tracking: .01em;--md-type-body-size: .95rem;--md-type-body-line: 1.45rem;--md-type-body-weight: 400;--md-type-body-tracking: .01em;--md-type-body-small-size: .82rem;--md-type-body-small-line: 1.2rem;--md-type-body-small-weight: 400;--md-type-body-small-tracking: .01em;--md-type-label-size: .75rem;--md-type-label-line: 1rem;--md-type-label-weight: 600;--md-type-label-tracking: .02em;--md-type-label-small-size: .72rem;--md-type-label-small-line: 1rem;--md-type-label-small-weight: 700;--md-type-label-small-tracking: .06em;--md-corner-xs: 4px;--md-corner-lg: 16px;--md-corner-xl: 28px;--md-ease-emphasized: cubic-bezier(.05, .7, .1, 1);--md-dur-short: .1s;--md-dur-medium: .25s;--md-elevation-1: 0 1px 2px rgba(0, 0, 0, .42), 0 1px 3px 1px rgba(0, 0, 0, .26);--md-elevation-2: 0 1px 2px rgba(0, 0, 0, .46), 0 2px 6px 2px rgba(0, 0, 0, .3);--md-elevation-3: 0 1px 3px rgba(0, 0, 0, .5), 0 4px 8px 3px rgba(0, 0, 0, .3);--md-elevation-4: 0 2px 3px rgba(0, 0, 0, .52), 0 6px 10px 4px rgba(0, 0, 0, .32);--md-elevation-5: 0 4px 4px rgba(0, 0, 0, .55), 0 8px 12px 6px 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#e0d4bc;--accent: #9a6a1c;--text: #2a2114;--muted: #8a7c5f;--key-white: #f3ecd9;--key-white-top: #fdf9ee;--key-black: #2a2418;--key-black-top: #4a4230;--key-seam: rgba(90, 70, 20, .3);--diff-easy: #4f9a37;--diff-medium: #2f80c6;--diff-hard: #bd4a2d;--md-primary: var(--accent);--md-on-primary: #fff8ec;--md-surface: var(--bg);--md-surface-container: var(--bg2);--md-surface-container-high: var(--bg3);--md-on-surface: var(--text);--md-on-surface-variant: var(--muted);--md-outline: #c3b088;--md-error: #b3261e;--md-on-error: #fff;--md-elevation-1: 0 1px 2px rgba(60, 45, 15, .16), 0 1px 3px 1px rgba(60, 45, 15, .08);--md-elevation-2: 0 1px 2px rgba(60, 45, 15, .18), 0 2px 6px 2px rgba(60, 45, 15, .1);--md-elevation-3: 0 1px 3px rgba(60, 45, 15, .16), 0 4px 8px 3px rgba(60, 45, 15, .12);--md-elevation-4: 0 2px 3px rgba(60, 45, 15, .18), 0 6px 10px 4px rgba(60, 45, 15, .13);--md-elevation-5: 0 4px 4px rgba(60, 45, 15, .2), 0 8px 12px 6px rgba(60, 45, 15, .14);--md-select-chevron: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' stroke='%236b6352' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}*{box-sizing:border-box;margin:0;padding:0}:focus{outline:none}:focus-visible{outline:2px solid var(--md-primary);outline-offset:2px}html,body{height:100%}body{font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}.shell{display:grid;grid-template-rows:auto auto 1fr;grid-template-columns:var(--sidebar-w, 280px) 6px 1fr;grid-template-areas:"header header header" "keys keys keys" "sidebar splitter view";height:100vh;transition:grid-template-columns var(--md-dur-medium) var(--md-ease-emphasized)}.shell.sidebar-collapsed,.shell.no-sidebar{grid-template-columns:0 0 1fr}.shell.no-sidebar .sidebar,.shell.no-sidebar .sidebar-splitter{display:none}.sidebar-splitter{grid-area:splitter;cursor:col-resize;background:var(--bg2);position:relative;z-index:3}.sidebar-splitter:before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:3px;height:46px;border-radius:2px;background:var(--bg3)}.sidebar-splitter:hover:before,.sidebar-splitter.dragging:before{background:var(--accent)}.shell.sidebar-collapsed .sidebar-splitter{display:none}body.col-resizing .shell{transition:none}header{grid-area:header;background:var(--bg2);padding:8px 16px;border-bottom:2px solid var(--bg3);display:flex;align-items:center;gap:14px}header h1{font-family:var(--md-type-title-large-font);color:var(--accent);font-size:var(--md-type-title-large-size);line-height:var(--md-type-title-large-line);font-weight:var(--md-type-title-large-weight);letter-spacing:var(--md-type-title-large-tracking);white-space:nowrap;flex-shrink:0}#siteTitle{cursor:pointer}#siteTitle:hover{opacity:.85}.app-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;min-height:40vh;padding:40px}.app-spinner{width:34px;height:34px;border:3px solid var(--bg3);border-top-color:var(--accent);border-radius:50%;animation:app-spin .8s linear infinite}@keyframes app-spin{to{transform:rotate(360deg)}}.splash{position:relative;min-height:76vh;border-radius:14px;overflow:hidden;background:#14100b;color:#fbf4e6;display:grid;grid-template-rows:1fr auto;isolation:isolate}.splash-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;min-height:100vh;border-radius:0;transition:opacity .55s ease}.splash-overlay.splash-fading{opacity:0;pointer-events:none}.splash-backdrop{position:absolute;top:-12%;right:-12%;bottom:-12%;left:-12%;z-index:0;filter:blur(30px) brightness(.42);background:radial-gradient(60% 50% at 30% 20%,rgba(200,150,60,.5),transparent 60%),linear-gradient(135deg,#3a2c1e,#211812 55%,#4a3319);background-size:cover;background-position:center}.splash-backdrop:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(180deg,#0f0a0659,#0f0a06b8)}.splash-stage{position:relative;z-index:2;display:grid;place-content:center;justify-items:center;gap:14px;text-align:center;padding:28px}.splash-portrait{width:128px;height:142px;border-radius:22px;overflow:hidden;position:relative;background:radial-gradient(120% 110% at 50% 20%,#eccca4,#c99b6d 42%,#6f4a2e);background-size:cover;background-position:center;box-shadow:0 18px 38px -14px #000000bf,0 0 0 1px #fbf4e61f;animation:splash-float 4s ease-in-out infinite alternate}.splash-portrait:before{content:"";position:absolute;top:19%;left:50%;transform:translate(-50%);width:40%;aspect-ratio:1;border-radius:50%;background:#281c1266}.splash-portrait:after{content:"";position:absolute;bottom:-6%;left:50%;transform:translate(-50%);width:82%;height:46%;border-radius:50% 50% 0 0;background:#281c1266}.splash-portrait.has-photo:before,.splash-portrait.has-photo:after{display:none}@keyframes splash-float{0%{transform:translateY(-7px)}to{transform:translateY(7px)}}.splash-title{font-family:var(--font-display);font-weight:700;font-size:clamp(1.4rem,3.4vw,2.1rem);letter-spacing:.02em;margin:4px 0 0;color:#fbf4e6}.splash-cap{color:#fbf4e6b8;font-size:.92rem;margin:0}.splash-dots:after{content:"";animation:splash-dots 1.4s steps(4,end) infinite}@keyframes splash-dots{0%{content:""}25%{content:"·"}50%{content:"··"}75%{content:"···"}}.splash-kb-wrap{position:relative;z-index:3;padding:0 0 max(14px,3vh);display:flex;justify-content:center}.splash-kb{--wk: clamp(20px, 4.2vw, 44px);position:relative;height:clamp(116px,19vh,164px);display:flex;filter:drop-shadow(0 -6px 18px rgba(0,0,0,.5));padding-top:8px}.splash-kb .wkey{width:var(--wk);height:100%;position:relative;background:linear-gradient(-30deg,#efe9dd,#fff);border:1px solid #c9bfa9;border-top:2px solid #2a2320;border-radius:0 0 5px 5px;box-shadow:inset 0 1px #fff,inset 1px 0 #ffffffb3,inset -1px 0 #0000000f,0 5px 4px #00000073}.splash-kb .wkey.on{top:2px;height:calc(100% - 4px);background:linear-gradient(-30deg,#f1d9a6,#fff7e8);box-shadow:0 2px 2px #00000052,inset 0 -6px 16px #c8963c73,inset 0 0 0 1px #c8963c59}.splash-kb .bkey{position:absolute;top:8px;width:calc(var(--wk) * .62);height:60%;z-index:10;background:linear-gradient(-18deg,#423b35,#0e0b09 58%,#3c352f);border-radius:0 0 4px 4px;box-shadow:inset 0 -2px 3px #ffffff38,0 4px 5px #0000008c}.splash-kb .bkey.on{height:calc(60% + 4px);background:linear-gradient(-18deg,#6f5527,#241a0b 58%,#5f4820);box-shadow:inset 0 -2px 3px #ffde9673,0 2px 2px #00000080,0 0 14px #c8963ca6}@media (prefers-reduced-motion: reduce){.splash-portrait,.splash-dots:after{animation:none}}.diff-filters{display:flex;align-items:center;gap:2px;flex-shrink:0}.diff-filter{width:30px;height:34px;padding:0;background:transparent;border:none;cursor:pointer;border-radius:6px;display:flex;align-items:center;justify-content:center;opacity:.4;transition:opacity var(--md-dur) var(--md-ease-standard),background var(--md-dur) var(--md-ease-standard)}.diff-filter:hover{opacity:.8;background:var(--bg3)}.diff-filter.active{opacity:1;background:color-mix(in srgb,var(--accent) 18%,transparent)}.diff-filter.active .diff-svg{filter:drop-shadow(0 0 1px color-mix(in srgb,currentColor 40%,transparent))}.diff-filter.d-easy{color:var(--diff-easy)}.diff-filter.d-medium{color:var(--diff-medium)}.diff-filter.d-hard{color:var(--diff-hard)}.diff-filter .diff-svg{display:block}.keys{grid-area:keys;height:16px;position:relative;overflow:hidden;background:linear-gradient(180deg,var(--key-white-top),var(--key-white));border-bottom:1px solid var(--bg3);box-shadow:inset 0 -2px 3px #00000024}.keys:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:repeating-linear-gradient(90deg,var(--key-seam) 0 1px,transparent 1px 22px)}.keys:after{content:"";position:absolute;top:0;left:0;right:0;height:66%;background:linear-gradient(180deg,var(--key-black-top) 0%,var(--key-black) 70%);-webkit-mask-image:linear-gradient(90deg,transparent 0 15px,#000 15px 29px,transparent 29px 37px,#000 37px 51px,transparent 51px 81px,#000 81px 95px,transparent 95px 103px,#000 103px 117px,transparent 117px 125px,#000 125px 139px,transparent 139px 154px);mask-image:linear-gradient(90deg,transparent 0 15px,#000 15px 29px,transparent 29px 37px,#000 37px 51px,transparent 51px 81px,#000 81px 95px,transparent 95px 103px,#000 103px 117px,transparent 117px 125px,#000 125px 139px,transparent 139px 154px);-webkit-mask-size:154px 100%;mask-size:154px 100%;-webkit-mask-repeat:repeat-x;mask-repeat:repeat-x}.sidebar{grid-area:sidebar;background:var(--bg2);border-right:1px solid var(--bg3);overflow:hidden;display:flex;flex-direction:column}.sidebar-controls{display:flex;flex-direction:row;align-items:center;gap:6px;padding:8px 12px;border-bottom:1px solid var(--bg3);flex:0 0 auto}.sidebar-controls .search-input{flex:1 1 auto;min-width:0;width:auto}.sidebar-scroll{flex:1 1 auto;overflow:auto;padding:0 12px 12px}.player-select,.midi-select,.key-sel{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:var(--md-select-chevron);background-repeat:no-repeat;background-position:right 8px center;background-size:12px 8px}.player-select:disabled,.midi-select:disabled,.key-sel:disabled{opacity:.55;cursor:not-allowed}.search-input{background-color:var(--md-surface);border:1px solid var(--md-outline);border-radius:var(--md-corner-sm);color:var(--md-on-surface);padding:6px 12px;font:inherit;font-size:.85rem;outline:none;transition:border-color var(--md-dur) var(--md-ease-standard),box-shadow var(--md-dur) var(--md-ease-standard)}.search-input:hover{border-color:var(--md-on-surface-variant)}.search-input:focus{border-color:var(--md-primary);box-shadow:0 0 0 1px var(--md-primary)}.search-input::placeholder{color:var(--md-on-surface-variant)}.sort-menu-wrap{position:relative;flex:0 0 auto;margin-left:auto;display:inline-flex}.sort-menu-wrap .sort-btn[aria-expanded=true]{background:var(--bg3);color:var(--md-on-surface)}.sort-menu{position:absolute;top:calc(100% + 6px);right:0;z-index:20;min-width:172px;padding:8px 0;display:flex;flex-direction:column;background:var(--md-surface-container-high);border:1px solid var(--md-outline);border-radius:var(--md-corner-sm);box-shadow:var(--md-elevation-3)}.sort-menu.hidden{display:none}.sort-opt,.md-select-opt{position:relative;display:flex;align-items:center;padding:10px 16px 10px 40px;border:none;background:transparent;color:var(--md-on-surface);font:inherit;font-size:.85rem;text-align:left;white-space:nowrap;cursor:pointer;transition:background var(--md-dur) var(--md-ease-standard)}.sort-opt:hover,.md-select-opt:hover,.md-select-opt:focus-visible{background:color-mix(in srgb,var(--md-on-surface) 8%,transparent);outline:none}.sort-opt.active,.md-select-opt.active{background:color-mix(in srgb,var(--md-primary) 14%,transparent);font-weight:600}.sort-opt:before,.md-select-opt:before{content:"";position:absolute;left:15px;width:16px;height:16px;background:currentColor;opacity:0;-webkit-mask:no-repeat center / contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M9 16.2 4.8 12l-1.4 1.4L9 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8px;font-size:.8rem}.md-select-trigger:hover{border-color:var(--md-on-surface-variant)}.md-select-trigger[aria-expanded=true],.md-select-trigger:focus-visible{border-color:var(--md-primary);box-shadow:0 0 0 1px var(--md-primary)}.md-select-trigger:disabled{opacity:.55;cursor:not-allowed}.md-select-label{overflow:hidden;text-overflow:ellipsis}.md-select-menu{position:absolute;top:calc(100% + 6px);left:0;z-index:20;min-width:160px;max-height:320px;overflow-y:auto;padding:8px 0;display:flex;flex-direction:column;background:var(--md-surface-container-high);border:1px solid var(--md-outline);border-radius:var(--md-corner-sm);box-shadow:var(--md-elevation-3)}.md-select-menu.align-right{left:auto;right:0}.md-select-menu.hidden{display:none}.genre-label{padding:6px 8px 4px 20px;font-size:var(--md-type-label-small-size);line-height:var(--md-type-label-small-line);font-weight:var(--md-type-label-small-weight);letter-spacing:var(--md-type-label-small-tracking);color:var(--muted);text-transform:uppercase}.lesson-row.hidden,.lesson-row.fav-hidden,.lesson-row.diff-hidden,.lesson-row.access-hidden,.lesson-row.completed-hidden,.acc-node.hidden,.acc-node.fav-node-hidden,.acc-node.diff-node-hidden,.acc-node.access-node-hidden,.acc-node.completed-node-hidden{display:none}.sidebar-filters{display:flex;align-items:center;flex-wrap:wrap;gap:4px;padding:8px 12px;border-bottom:1px solid var(--bg3);flex:0 0 auto}.completed-filter.active{background:var(--bg3)}.completed-filter.f-done{color:var(--diff-easy)}.completed-filter.f-todo{color:var(--accent)}.view{grid-area:view;overflow:auto;padding:16px;display:flex;flex-direction:column;min-height:0;min-width:0}.muted{color:var(--muted)}.btn{position:relative;isolation:isolate;display:inline-block;padding:8px 16px;border:1px solid var(--md-outline);background:transparent;color:var(--md-on-surface);border-radius:var(--md-corner-full);font:inherit;cursor:pointer;transition:border-color var(--md-dur) var(--md-ease-standard)}.btn:hover{border-color:var(--md-primary)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--md-primary);border-color:transparent;color:var(--md-on-primary);font-weight:600;transition:box-shadow var(--md-dur) var(--md-ease-standard)}.btn.primary:hover{box-shadow:0 1px 4px #00000047}.btn.link{border:none;background:none;padding:6px 12px;color:var(--md-primary)}.btn:after,.cbtn:after,.icon-btn:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;border-radius:inherit;background:currentColor;opacity:0;pointer-events:none;transition:opacity var(--md-dur) var(--md-ease-standard)}.btn:hover:after,.cbtn:hover:not(:disabled):after,.icon-btn:hover:not(:disabled):after{opacity:var(--md-state-hover)}.btn:focus-visible:after,.cbtn:focus-visible:not(:disabled):after,.icon-btn:focus-visible:not(:disabled):after{opacity:var(--md-state-focus)}.btn:active:after,.cbtn:active:not(:disabled):after,.icon-btn:active:not(:disabled):after{opacity:var(--md-state-press)}.icon-btn{position:relative;isolation:isolate;width:34px;height:34px;background:transparent;border:none;color:var(--md-on-surface-variant);cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:var(--md-corner-full);transition:color var(--md-dur) var(--md-ease-standard)}.icon-btn:hover{color:var(--md-on-surface)}.icon-btn svg{width:17px;height:17px}.icon-btn:disabled{opacity:.4;cursor:default}.icon-btn.outlined{border:1px solid var(--md-outline)}.lang-toggle{font-size:.7rem;font-weight:700;letter-spacing:.04em}.icon-btn.heart{font-size:1.02rem;line-height:1}.icon-btn.heart.active{color:color-mix(in srgb,#d9534f 72%,var(--accent))}.icon-btn.heart.active svg{fill:currentColor}.icon-btn.access{font-size:1rem;line-height:1}.icon-btn.access.active{background:var(--bg3);color:var(--accent)}.icon-btn.access.hidden{display:none}header #themeBtn{margin-left:auto}.boosty-cta{flex-shrink:0;display:inline-flex;align-items:center;gap:7px;padding:6px 14px;border-radius:var(--md-corner-full);background:#f15f2c;color:#fff;font-weight:600;font-size:.85rem;white-space:nowrap;text-decoration:none;box-shadow:var(--md-elevation-1);transition:box-shadow var(--md-dur) var(--md-ease-standard),filter var(--md-dur) var(--md-ease-standard)}.boosty-cta:hover{box-shadow:var(--md-elevation-2);filter:brightness(1.06)}.boosty-cta:focus-visible{outline:2px solid var(--md-primary);outline-offset:2px}.boosty-cta svg{display:block}#themeBtn 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var(--md-ease-standard),box-shadow var(--md-dur) var(--md-ease-standard)}.login .iti{display:block;width:100%}.login-input:hover{border-color:var(--md-on-surface-variant)}.login-input:focus{border-color:var(--md-primary);box-shadow:0 0 0 1px var(--md-primary)}.login-input::placeholder{color:var(--md-on-surface-variant)}.login-error{margin-top:12px;color:var(--md-error);min-height:1.2em}.login-hint{margin-top:14px;font-size:.85rem}.phone-field{font-variant-numeric:tabular-nums;letter-spacing:.02em}.code-boxes{display:flex;gap:8px;justify-content:space-between}.code-box{flex:1 1 0;min-width:0;height:52px;text-align:center;font-size:1.5rem;font-variant-numeric:tabular-nums;border:1px solid var(--md-outline);background-color:var(--md-surface);color:var(--md-on-surface);border-radius:var(--md-corner-sm);outline:none;transition:border-color var(--md-dur) var(--md-ease-standard),box-shadow var(--md-dur) 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var(--md-ease-standard)}.card:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;background:currentColor;opacity:0;transition:opacity var(--md-dur) var(--md-ease-standard);z-index:2}.card:hover{border-color:color-mix(in srgb,var(--md-primary) 55%,var(--md-outline));box-shadow:var(--md-elevation-2);transform:translateY(-2px)}.card:hover:after{opacity:var(--md-state-hover)}.card:active:after{opacity:var(--md-state-press)}@media (prefers-reduced-motion: reduce){.card{transition:box-shadow var(--md-dur) var(--md-ease-standard),border-color var(--md-dur) var(--md-ease-standard)}.card:hover{transform:none}}.card-poster{width:100%;aspect-ratio:16 / 9;object-fit:cover;background:var(--bg3);border:none}.card-poster.placeholder{display:flex;align-items:center;justify-content:center;font-size:2rem;color:var(--muted)}.card.locked .card-poster{filter:grayscale(.5) brightness(.7)}.card-meta{padding:8px 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var(--md-ease-standard)}.player-select:hover{border-color:var(--md-on-surface-variant)}.player-select:focus{border-color:var(--md-primary);box-shadow:0 0 0 1px var(--md-primary)}.seg{display:inline-flex;border:1px solid var(--md-outline);border-radius:var(--md-corner-full);overflow:hidden}.seg-btn{border:none;background:transparent;color:var(--accent);font:inherit;font-size:.78rem;padding:5px 12px;cursor:pointer;white-space:nowrap;transition:background var(--md-dur) var(--md-ease-standard),color var(--md-dur) var(--md-ease-standard)}.seg-btn+.seg-btn{border-left:1px solid var(--md-outline)}.seg-btn:hover:not(.active){background:color-mix(in srgb,var(--md-on-surface) 8%,transparent)}.seg-btn.active{background:color-mix(in srgb,var(--md-primary) 22%,transparent);color:var(--accent);font-weight:600}.seg-btn.hand-clef{font-size:1.35rem;line-height:1;padding:6px 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