:root{--bg-deep: #0a0a14;--bg-card: rgba(18, 18, 32, .85);--bg-card-border: rgba(139, 92, 246, .12);--surface: rgba(30, 30, 52, .6);--surface-hover: rgba(40, 40, 68, .8);--text-primary: #f0eef6;--text-secondary: #9b97b0;--text-muted: #5d5a72;--accent-violet: #8b5cf6;--accent-indigo: #6366f1;--accent-pink: #ec4899;--accent-cyan: #22d3ee;--gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #4f46e5 100%);--gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(139, 92, 246, .15) 0%, transparent 60%);--white-key-bg: linear-gradient(180deg, #f8f7fc 0%, #e8e6f0 100%);--white-key-active: linear-gradient(180deg, #c4b5fd 0%, #a78bfa 100%);--black-key-bg: linear-gradient(180deg, #2a2a3e 0%, #16162a 100%);--black-key-active: linear-gradient(180deg, #7c3aed 0%, #5b21b6 100%);--shadow-key: 0 4px 12px rgba(0, 0, 0, .4), 0 2px 4px rgba(0, 0, 0, .3);--shadow-key-active: 0 1px 4px rgba(0, 0, 0, .3);--shadow-card: 0 8px 32px rgba(0, 0, 0, .3), 0 0 0 1px var(--bg-card-border);--shadow-glow: 0 0 40px rgba(139, 92, 246, .15);--radius-sm: 6px;--radius-md: 12px;--radius-lg: 20px;--radius-xl: 28px;--transition-fast: 60ms ease;--transition-med: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--font: "Inter", -apple-system, BlinkMacSystemFont, sans-serif}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font);background:var(--bg-deep);color:var(--text-primary);min-height:100vh;display:flex;justify-content:center;align-items:center;overflow-x:hidden;position:relative}.background-glow{position:fixed;inset:0;pointer-events:none;z-index:0;background:var(--gradient-glow)}.background-glow:after{content:"";position:absolute;bottom:0;left:50%;transform:translate(-50%);width:120%;height:50%;background:radial-gradient(ellipse at 50% 100%,rgba(99,102,241,.08) 0%,transparent 50%)}.container{position:relative;z-index:1;width:100%;max-width:920px;padding:32px 24px 40px;margin:24px;background:var(--bg-card);backdrop-filter:blur(24px);border:1px solid var(--bg-card-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-card),var(--shadow-glow);animation:fadeInUp .6s var(--transition-slow)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}.header{text-align:center;margin-bottom:28px}.logo-icon{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;background:var(--surface);border-radius:var(--radius-md);margin-bottom:16px;border:1px solid rgba(139,92,246,.15)}.header h1{font-size:1.75rem;font-weight:800;letter-spacing:-.03em;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:6px}.subtitle{font-size:.875rem;color:var(--text-secondary);font-weight:400}.visualizer-wrapper{width:100%;margin-bottom:24px;border-radius:var(--radius-md);overflow:hidden;background:#14142680;border:1px solid rgba(139,92,246,.08)}#visualizer{width:100%;height:80px;display:block}.piano-container{display:flex;justify-content:center;padding:0 8px;margin-bottom:16px;overflow-x:auto;-webkit-overflow-scrolling:touch}.piano{position:relative;display:flex;height:200px;user-select:none;flex-shrink:0}.key-white{position:relative;width:52px;height:200px;background:var(--white-key-bg);border:1px solid rgba(0,0,0,.12);border-radius:0 0 var(--radius-sm) var(--radius-sm);cursor:pointer;z-index:1;transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);box-shadow:var(--shadow-key);display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding-bottom:10px;margin-right:2px}.key-white:hover{background:linear-gradient(180deg,#fff,#f0eef6)}.key-white.active{background:var(--white-key-active);transform:translateY(3px);box-shadow:var(--shadow-key-active)}.key-white.active .key-bind{color:#fff}.key-white.active .key-note{color:#ffffffb3}.key-black{position:absolute;width:34px;height:125px;background:var(--black-key-bg);border-radius:0 0 5px 5px;cursor:pointer;z-index:2;transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);box-shadow:var(--shadow-key),inset 0 -4px 6px #0000004d;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding-bottom:8px}.key-black:hover{background:linear-gradient(180deg,#3c3c5a,#1e1e36)}.key-black.active{background:var(--black-key-active);transform:translateY(3px);box-shadow:var(--shadow-key-active),inset 0 -2px 4px #0000004d}.key-bind{font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:#6b6886;line-height:1}.key-note{font-size:.55rem;font-weight:400;color:#9b97b0;margin-top:2px;line-height:1}.key-black .key-bind{color:#fff9}.key-black .key-note{color:#ffffff4d}.key-black.active .key-bind{color:#fff}.key-white.active:after{content:"";position:absolute;bottom:-8px;left:50%;transform:translate(-50%);width:30px;height:12px;background:radial-gradient(ellipse,rgba(139,92,246,.5),transparent);border-radius:50%;pointer-events:none}.key-black.active:after{content:"";position:absolute;bottom:-6px;left:50%;transform:translate(-50%);width:24px;height:10px;background:radial-gradient(ellipse,rgba(124,58,237,.6),transparent);border-radius:50%;pointer-events:none}.note-display{text-align:center;margin-bottom:24px;min-height:36px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}.note-label{font-size:.8rem;color:var(--text-muted);font-weight:400}.note-badge{display:inline-flex;align-items:center;justify-content:center;padding:4px 14px;background:var(--gradient-primary);border-radius:20px;font-size:.8rem;font-weight:600;color:#fff;letter-spacing:.02em;animation:popIn .15s ease}@keyframes popIn{0%{transform:scale(.7);opacity:0}to{transform:scale(1);opacity:1}}.controls{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-bottom:28px;padding:16px 20px;background:var(--surface);border-radius:var(--radius-md);border:1px solid rgba(139,92,246,.08)}.control-group{display:flex;flex-direction:column;align-items:center;gap:6px;min-width:120px}.control-group label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary)}.control-group select{background:#141426cc;color:var(--text-primary);border:1px solid rgba(139,92,246,.2);border-radius:var(--radius-sm);padding:6px 28px 6px 12px;font-family:var(--font);font-size:.8rem;cursor:pointer;transition:border-color var(--transition-med);outline:none;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%239b97b0' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center}.control-group select:hover,.control-group select:focus{border-color:var(--accent-violet)}.control-group input[type=range]{-webkit-appearance:none;appearance:none;width:120px;height:6px;background:#8b5cf626;border-radius:3px;outline:none;cursor:pointer}.control-group input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--gradient-primary);cursor:pointer;box-shadow:0 0 8px #8b5cf666;transition:transform .15s ease}.control-group input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2)}.control-group input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--accent-violet);cursor:pointer;border:none}.instructions{background:var(--surface);border-radius:var(--radius-md);padding:20px 24px;border:1px solid rgba(139,92,246,.08)}.instructions h2{font-size:.9rem;font-weight:700;color:var(--text-primary);margin-bottom:14px;letter-spacing:-.01em}.instruction-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.instruction-item{display:flex;align-items:flex-start;gap:10px}.instruction-icon{font-size:1.1rem;flex-shrink:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:#8b5cf61a;border-radius:var(--radius-sm)}.instruction-item strong{display:block;font-size:.78rem;font-weight:600;color:var(--text-primary);margin-bottom:2px}.instruction-item span{font-size:.72rem;color:var(--text-secondary);line-height:1.4}@media(max-width:860px){.piano-container{justify-content:flex-start}.piano{transform-origin:left center;transform:scale(.75)}.container{margin:12px;padding:24px 16px 32px}}@media(max-width:600px){.piano{transform:scale(.55)}.instruction-grid{grid-template-columns:1fr}.header h1{font-size:1.35rem}.controls{flex-direction:column;align-items:stretch}.control-group{flex-direction:row;justify-content:space-between;min-width:0}}