.music-note-card{--primary: #8b5cf6;--primary-rgb: 139, 92, 246;--secondary: #d946ef;--accent: #f59e0b;--bg-card: rgba(255, 255, 255, .8);--border-card: rgba(139, 92, 246, .2);--text-main: #1e293b;--text-muted: #64748b;--glass-bg: rgba(255, 255, 255, .5);--glass-border: rgba(139, 92, 246, .1);--piano-bg: #18181b;max-width:1000px;margin:2rem auto;background:var(--bg-card);backdrop-filter:blur(16px);border:1px solid var(--border-card);border-radius:2rem;padding:2.5rem;color:var(--text-main);display:flex;flex-direction:column;gap:2.5rem}:global(.dark) .music-note-card{--bg-card: rgba(15, 23, 42, .8);--border-card: rgba(139, 92, 246, .3);--text-main: #f8fafc;--text-muted: #94a3b8;--glass-bg: rgba(30, 41, 59, .5);--glass-border: rgba(255, 255, 255, .1)}.converter-header{text-align:center;display:flex;flex-direction:column;gap:1.5rem}#current-note-display{font-size:2.5rem;font-weight:950;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin:0;letter-spacing:-1px}.piano-container{overflow-x:auto;padding:1rem 0;display:flex;justify-content:center}.piano{display:flex;position:relative;background:var(--piano-bg);padding:.75rem;border-radius:1rem;user-select:none}.key{cursor:pointer;transition:all .15s cubic-bezier(.4,0,.2,1);display:flex;align-items:flex-end;justify-content:center;padding-bottom:1rem;font-size:.7rem;font-weight:800;text-transform:uppercase}.key.white{width:44px;height:180px;background:linear-gradient(to bottom,#fff,#f1f5f9);border:1px solid #e2e8f0;border-radius:0 0 6px 6px;margin:0 1px;z-index:1;color:#94a3b8}.key.black{width:32px;height:110px;background:linear-gradient(to bottom,#334155,#0f172a);border:1px solid #000;border-radius:0 0 4px 4px;margin-left:-16px;margin-right:-16px;z-index:2;color:#475569}.key:hover{transform:translateY(4px);filter:brightness(.95)}.key.active{background:var(--primary)!important;color:#fff!important;border-color:var(--primary)!important}.key.active.black{background:var(--secondary)!important;border-color:var(--secondary)!important}.octave-group{display:flex;position:relative}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.info-card{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:1.5rem;padding:1.75rem;display:flex;flex-direction:column;gap:1.25rem;transition:transform .2s}.info-card:hover{transform:translateY(-5px)}.card-title{font-size:.75rem;font-weight:900;text-transform:uppercase;letter-spacing:.1em;color:var(--primary);border-bottom:1px solid var(--glass-border);padding-bottom:.5rem}.system-row{display:flex;justify-content:space-between;align-items:center}.system-label{font-size:.9rem;font-weight:600;color:var(--text-muted)}.system-value{font-weight:800;font-size:1.15rem;color:var(--text-main)}.val-highlight{color:var(--primary)}.octave-selector{display:flex;align-items:center;justify-content:center;gap:1rem;flex-wrap:wrap}.octave-label{font-size:.8rem;font-weight:800;text-transform:uppercase;color:var(--text-muted)}.octave-buttons{display:flex;gap:.35rem;background:var(--glass-bg);padding:.4rem;border-radius:.75rem;border:1px solid var(--glass-border)}.octave-btn{background:transparent;border:none;color:var(--text-muted);width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:.5rem;cursor:pointer;font-weight:800;transition:all .2s}.octave-btn:hover{background:rgba(var(--primary-rgb),.1);color:var(--primary)}.octave-btn.active{background:var(--primary);color:#fff}.actions{display:flex;gap:1rem;margin-top:.5rem}.btn-action{flex:1;padding:.85rem;border-radius:1rem;border:none;font-weight:800;font-size:.9rem;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1)}.btn-play{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;box-shadow:none}.btn-copy{background:var(--glass-bg);color:var(--text-main);border:1px solid var(--glass-border)}.btn-action:hover{transform:translateY(-3px) scale(1.02);filter:brightness(1.1)}.frequency-display{display:flex;align-items:baseline;gap:.5rem}.freq-val{font-size:3.5rem;font-weight:950;letter-spacing:-2px;color:var(--primary)}.hz-unit{font-size:1.25rem;font-weight:800;color:var(--text-muted)}.visualizer-container{width:100%;height:80px;background:#0000000d;border-radius:1rem;overflow:hidden;display:flex;align-items:center;border:1px solid var(--glass-border)}:global(.dark) .visualizer-container{background:#ffffff0d}#note-visualizer{width:100%;height:100%}@media(max-width:768px){.music-note-card{padding:1.5rem;margin:1rem;border-radius:1.5rem}#current-note-display{font-size:1.75rem}.key.white{width:36px;height:140px}.key.black{width:24px;height:90px;margin-left:-12px;margin-right:-12px}.freq-val{font-size:2.5rem}}@media(max-width:600px){.music-note-card{padding:1rem;margin:0;border-radius:1rem;gap:1.5rem}#current-note-display{font-size:1.4rem;letter-spacing:-.5px}.octave-selector{flex-direction:column;gap:.6rem}.octave-label{font-size:.7rem}.octave-buttons{flex-wrap:wrap;justify-content:center;gap:.25rem}.octave-btn{width:28px;height:28px;font-size:.8rem}.piano-container{padding:.5rem 0}.piano{padding:.5rem}.key.white{width:22px;height:110px;padding-bottom:.5rem;font-size:.55rem}.key.black{width:14px;height:68px;margin-left:-7px;margin-right:-7px;font-size:.45rem;padding-bottom:.35rem}.info-grid{grid-template-columns:1fr;gap:1rem}.info-card{padding:1.25rem;gap:1rem;border-radius:1rem}.info-card:hover{transform:none}.system-label{font-size:.8rem}.system-value{font-size:1rem}.freq-val{font-size:2rem;letter-spacing:-1px}.hz-unit{font-size:1rem}.btn-action{padding:.75rem;font-size:.85rem}.visualizer-container{height:60px}}