.loading-spinner{animation:spin 1s linear infinite;border:4px solid #e5e7eb;border-radius:50%;border-top-color:#3b82f6;height:60px;margin:0 auto;width:60px}.dark .loading-spinner{border-color:#3b82f6 #4b5563 #4b5563}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(1turn)}}#loading-screen{transition:opacity .5s ease,visibility .5s ease}#loading-screen.fade-out{opacity:0;visibility:hidden}.modern-switch{display:inline-block;position:relative}.modern-switch input{height:0;opacity:0;width:0}.switch-label{background:#e5e7eb;border-radius:13px;box-shadow:inset 0 2px 4px #0000001a;cursor:pointer;display:inline-block;height:26px;position:relative;transition:all .3s cubic-bezier(.4,0,.2,1);width:50px}.dark .switch-label{background:#4b5563}.switch-slider{background:#fff;border-radius:50%;box-shadow:0 2px 4px #0003;height:22px;left:2px;position:absolute;top:2px;transition:all .3s cubic-bezier(.4,0,.2,1);width:22px}.modern-switch input:checked+.switch-label{background:linear-gradient(135deg,#3b82f6,#1d4ed8)}.modern-switch input:checked+.switch-label .switch-slider{box-shadow:0 2px 8px #3b82f666;transform:translate(24px)}.modern-switch input:focus+.switch-label{outline:2px solid #93c5fd;outline-offset:2px}.modern-switch.scale-75{transform:scale(.75)}.sustain-indicator{align-items:center;display:flex;flex-direction:column;gap:8px}.sustain-pedal{cursor:pointer;height:60px;position:relative;transition:all .3s ease;width:80px}.pedal-body{align-items:center;background:linear-gradient(145deg,#f3f4f6,#e5e7eb);border:2px solid #d1d5db;border-radius:8px;box-shadow:0 4px 8px #00000026,inset 0 1px #fffc;display:flex;flex-direction:column;height:100%;justify-content:space-between;padding:8px;width:100%}.dark .pedal-body{background:linear-gradient(145deg,#4b5563,#374151);border-color:#6b7280}.pedal-top{background:linear-gradient(90deg,#9ca3af,#6b7280);border-radius:4px;box-shadow:inset 0 1px 2px #0000004d;height:8px;width:60%}.pedal-status{align-items:center;display:flex;flex-direction:column;gap:4px}.status-text{color:#6b7280;font-size:10px;font-weight:600;transition:color .3s ease}.dark .status-text{color:#9ca3af}.status-light{background:#ef4444;border-radius:50%;box-shadow:0 0 8px #ef444480;height:8px;transition:all .3s ease;width:8px}.sustain-pedal.active .pedal-body{background:linear-gradient(145deg,#ddd6fe,#c4b5fd);border-color:#8b5cf6;box-shadow:0 2px 4px #0003,inset 0 1px #fffc;transform:translateY(2px)}.dark .sustain-pedal.active .pedal-body{background:linear-gradient(145deg,#7c3aed,#6d28d9);border-color:#8b5cf6}.sustain-pedal.active .status-text{color:#7c3aed}.dark .sustain-pedal.active .status-text{color:#c4b5fd}.sustain-pedal.active .status-light{background:#22c55e;box-shadow:0 0 12px #22c55ecc}.sustain-pedal.scale-75{transform:scale(.75)}.theme-toggle-btn{background:linear-gradient(135deg,#fbbf24,#f59e0b);border:none;border-radius:13px;box-shadow:0 2px 4px #0000001a;cursor:pointer;height:26px;overflow:hidden;position:relative;transition:all .3s ease;width:50px}.theme-toggle-btn:hover{box-shadow:0 4px 8px #0003;transform:scale(1.05)}.theme-icon{font-size:14px;left:4px;position:absolute;top:50%;transform:translateY(-50%);transition:all .3s ease}.dark .theme-toggle-btn{background:linear-gradient(135deg,#1f2937,#111827)}.dark .theme-icon{left:28px}.immersive-overlay{background:#000000f2;height:100vh;left:0;opacity:0;position:fixed;top:0;transition:all .5s ease;visibility:hidden;width:100vw;z-index:1000}.immersive-overlay.active{opacity:1;visibility:visible}.immersive-hint{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff1a;border:1px solid hsla(0,0%,100%,.2);border-radius:25px;left:50%;padding:12px 24px;position:absolute;top:30px;transform:translate(-50%);transition:opacity .5s ease,transform .5s ease}.immersive-hint p{color:#fff;font-size:14px;font-weight:500;margin:0}body.immersive-mode .immersive-overlay{opacity:1;visibility:visible}body.immersive-mode #piano-section{position:relative;z-index:1001}.scale-slider,.volume-slider{background:linear-gradient(90deg,#f97316 0 80%,#e5e7eb 0,#e5e7eb);transition:all .3s ease}.dark .scale-slider,.dark .volume-slider{background:linear-gradient(90deg,#f97316 0 80%,#4b5563 0,#4b5563)}.scale-slider::-webkit-slider-thumb,.volume-slider::-webkit-slider-thumb{appearance:none;background:linear-gradient(45deg,#f97316,#ea580c);border:2px solid #fff;border-radius:50%;box-shadow:0 3px 8px #f9731666,0 1px 3px #0000001a;cursor:pointer;height:20px;transition:all .2s ease;width:20px}.scale-slider::-webkit-slider-thumb:hover,.volume-slider::-webkit-slider-thumb:hover{box-shadow:0 4px 12px #f9731699,0 2px 6px #00000026;transform:scale(1.1)}.scale-slider::-moz-range-thumb,.volume-slider::-moz-range-thumb{background:linear-gradient(45deg,#f97316,#ea580c);border:2px solid #fff;border-radius:50%;box-shadow:0 3px 8px #f9731666;cursor:pointer;height:18px;width:18px}.scale-slider::-webkit-slider-thumb{background:linear-gradient(45deg,#6366f1,#4f46e5)}.scale-slider::-moz-range-thumb{background:linear-gradient(45deg,#6366f1,#4f46e5)}#piano-container{align-items:flex-start;min-width:fit-content}#piano-container,.key{display:flex;position:relative}.key{align-items:flex-end;border-radius:0 0 8px 8px;box-sizing:border-box;cursor:pointer;justify-content:center;padding-bottom:12px;transition:all .05s ease;-webkit-user-select:none;user-select:none;z-index:1}.key.white{background:linear-gradient(180deg,#fff 0,#f8fafc 50%,#f1f5f9);border:2px solid #e2e8f0;border-top:3px solid #cbd5e1;box-shadow:0 4px 8px #00000014,inset 0 1px #ffffffe6,inset 0 -1px #0000000d;height:250px;width:60px}.key.white.central-c{border-color:#3b82f6;border-width:3px;box-shadow:0 4px 12px #3b82f633,inset 0 1px #ffffffe6,inset 0 -1px #0000000d}.key.white.central-c:before{color:#3b82f6;content:"●";font-size:10px;left:50%;pointer-events:none;position:absolute;top:10px;transform:translate(-50%)}.key.black{background:linear-gradient(180deg,#374151 0,#1f2937 50%,#111827);border:2px solid #4b5563;border-top:3px solid #6b7280;box-shadow:0 4px 12px #0000004d,inset 0 1px #ffffff1a,inset 0 -1px #0003;height:150px;position:absolute;width:40px;z-index:2}.note-label{font-size:13px;font-weight:600;opacity:.8;pointer-events:none}.key.white .note-label{color:#64748b}.key.black .note-label{color:#e2e8f0}.key.white.pressed{background:linear-gradient(180deg,#e2e8f0 0,#cbd5e1 50%,#94a3b8);border-top:4px solid #94a3b8;box-shadow:0 1px 2px #0003,inset 0 3px 6px #00000026,inset 0 1px 3px #0000001a}.key.black.pressed{background:linear-gradient(180deg,#1f2937 0,#111827 50%,#000);border-top:4px solid #000;box-shadow:0 1px 3px #00000080,inset 0 3px 8px #0006,inset 0 1px 4px #0000004d}.key.white:hover:not(.pressed){background:linear-gradient(180deg,#f8fafc 0,#f1f5f9 50%,#e2e8f0);box-shadow:0 6px 12px #0000001f,inset 0 1px #ffffffe6}.key.black:hover:not(.pressed){background:linear-gradient(180deg,#4b5563 0,#374151 50%,#1f2937);box-shadow:0 6px 16px #0006,inset 0 1px #ffffff26}.piano-wrapper{display:flex;justify-content:center;margin:0;overflow-x:auto;overflow-y:hidden;padding:0;scrollbar-color:rgba(59,130,246,.5) transparent;scrollbar-width:thin;width:100%}.piano-wrapper::-webkit-scrollbar{height:8px}.piano-wrapper::-webkit-scrollbar-track{background:#e5e7eb80;border-radius:4px}.piano-wrapper::-webkit-scrollbar-thumb{background:#3b82f680;border-radius:4px}.piano-wrapper::-webkit-scrollbar-thumb:hover{background:#3b82f6b3}.piano-wrapper{background:linear-gradient(145deg,#1a1a1a,#000 50%,#0a0a0a)!important;border:1px solid #333;box-shadow:inset 0 1px #ffffff1a,inset 0 -1px #000c,0 4px 20px #00000080,0 8px 40px #0000004d!important;position:relative}.piano-wrapper:before{background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.1),transparent);height:2px;top:0}.piano-wrapper:after,.piano-wrapper:before{content:"";left:0;pointer-events:none;position:absolute;right:0}.piano-wrapper:after{background:linear-gradient(90deg,#000c,#0006,#000c);bottom:0;height:3px}.midi-progress-container{background:#6b728026;border-radius:9999px;height:8px;overflow:hidden;width:100%}.dark .midi-progress-container{background:#9ca3af40}.midi-progress-bar{background:linear-gradient(90deg,#22c55e,#16a34a);height:100%;transition:width .1s linear;width:0}@media(max-width:1200px){.key.white{height:220px;width:52px}.key.black{height:130px;width:35px}.note-label{font-size:12px}.xl\\:grid-cols-4{grid-template-columns:repeat(2,1fr)!important}}@media(max-width:768px){.lg\\:grid-cols-2{grid-template-columns:1fr!important}.xl\\:grid-cols-4{grid-template-columns:1fr!important}.key.white{height:200px;padding-bottom:10px;width:48px}.key.black{height:120px;width:32px}.note-label{font-size:11px}h1{font-size:2rem!important}.container{padding-left:1rem!important;padding-right:1rem!important}}@media(max-width:640px){.lg\\:grid-cols-2,.xl\\:grid-cols-4{gap:1rem!important;grid-template-columns:1fr!important}.key.white{height:170px;padding-bottom:8px;width:40px}.key.black{height:102px;width:27px}.note-label{font-size:10px}h1{font-size:1.75rem!important}.text-lg{font-size:1rem!important}.flex-wrap span{font-size:.625rem!important;padding:.25rem .5rem!important}}@media(max-width:480px){.key.white{height:150px;padding-bottom:6px;width:36px}.key.black{height:90px;width:24px}.note-label{font-size:9px}h1{font-size:1.5rem!important}.space-y-2>*+*{margin-top:.5rem!important}input[type=range],select{font-size:.875rem!important}}@media(min-width:1400px){.key.white{height:270px;width:65px}.key.black{height:162px;width:43px}.note-label{font-size:14px}}@media(max-height:600px)and (orientation:landscape){.container{padding-bottom:1rem!important;padding-top:1rem!important}.key.white{height:120px}.key.black{height:75px}.text-center.mb-8{display:none}.bg-white\/90{margin-bottom:1rem!important;padding:1rem!important}}