.song-key-finder{max-width:1000px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif}
.song-key-finder h2{margin:0 0 15px;font-size:1.75rem;color:#1a1a1a}
.skf-intro{margin-bottom:25px;padding:15px;background:#e8eaf6;border-left:4px solid #3f51b5;border-radius:4px;color:#1a237e;font-size:.95rem}
.skf-intro p{margin:0}
.skf-upload{margin-bottom:25px}
.skf-dropzone{padding:50px 30px;background:#fff;border:3px dashed #3f51b5;border-radius:12px;text-align:center;cursor:pointer;transition:all .3s}
.skf-dropzone:hover{background:#f5f5f5;border-color:#283593}
.skf-dropzone.skf-dragover{background:#e8eaf6;border-color:#283593;border-style:solid}
.skf-upload-icon{font-size:4rem;margin-bottom:15px}
.skf-upload-text{font-size:1.1rem;font-weight:600;color:#333;margin-bottom:8px}
.skf-upload-formats{font-size:.85rem;color:#666}
.skf-control{margin-bottom:25px;padding:25px;background:#fff;border:2px solid #ddd;border-radius:8px}
.skf-buttons{display:flex;gap:10px;margin-bottom:15px;flex-wrap:wrap}
.skf-btn{padding:12px 24px;border:none;border-radius:6px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s;background:#fff;border:2px solid #ddd;color:#333}
.skf-btn:hover:not(:disabled){background:#f5f5f5;border-color:#3f51b5;color:#3f51b5}
.skf-btn:active{transform:scale(.98)}
.skf-btn-primary{background:linear-gradient(135deg,#3f51b5 0%,#303f9f 100%);color:#fff;border-color:#3f51b5}
.skf-btn-primary:hover:not(:disabled){background:linear-gradient(135deg,#303f9f 0%,#283593 100%);border-color:#283593;color:#fff}
.skf-btn:disabled{opacity:.5;cursor:not-allowed}
.skf-status{padding:12px 15px;background:#f5f5f5;border-radius:6px;text-align:center;font-weight:600;color:#3f51b5;font-size:.9rem}
.skf-display{display:grid;grid-template-columns:2fr 1fr;gap:20px;margin-bottom:30px}
.skf-key-box{padding:35px 30px;background:linear-gradient(135deg,#3f51b5 0%,#303f9f 100%);border-radius:8px;text-align:center;color:#fff}
.skf-conf-box{padding:35px 30px;background:linear-gradient(135deg,#4caf50 0%,#388e3c 100%);border-radius:8px;text-align:center;color:#fff}
.skf-key-label,.skf-conf-label{font-size:.85rem;opacity:.9;text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px}
.skf-key-value,.skf-conf-value{font-size:3.5rem;font-weight:700;font-family:'Courier New',monospace;margin-bottom:5px;line-height:1}
.skf-key-mode,.skf-conf-unit{font-size:1rem;opacity:.85;margin-top:8px}
.skf-results{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:15px;margin-bottom:30px;padding:25px;background:#f8f9fa;border-radius:8px}
.skf-card{padding:20px;background:#fff;border:2px solid #ddd;border-radius:8px;text-align:center}
.skf-label{font-size:.8rem;color:#666;text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;font-weight:600}
.skf-value{font-size:1.6rem;font-weight:700;color:#3f51b5;margin-bottom:4px;font-family:'Courier New',monospace}
.skf-value.skf-notes{font-size:1.1rem;line-height:1.4}
.skf-unit{font-size:.75rem;color:#999}
.skf-visualizer{margin-bottom:30px;padding:25px;background:#fff;border:2px solid #ddd;border-radius:8px}
.skf-vis-title{font-weight:700;font-size:.95rem;color:#333;margin-bottom:15px}
.skf-canvas{width:100%;max-width:100%;height:auto;border:2px solid #ddd;border-radius:6px;background:#f8f9fa;display:block}
.skf-related{margin-bottom:30px;padding:25px;background:#e8f5e9;border-left:4px solid #4caf50;border-radius:8px}
.skf-related-title{font-weight:700;font-size:1rem;color:#1b5e20;margin-bottom:15px}
.skf-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.skf-related-item{padding:12px;background:#fff;border:2px solid #4caf50;border-radius:6px;text-align:center;font-weight:600;color:#2e7d32;transition:all .2s}
.skf-related-item:hover{background:#4caf50;color:#fff;transform:scale(1.05)}
.skf-tips{margin-bottom:25px;padding:20px;background:#fff3e0;border-left:4px solid #ff9800;border-radius:8px}
.skf-tip-title{font-weight:700;font-size:.95rem;color:#e65100;margin-bottom:10px}
.skf-tips ul{margin:0;padding-left:20px;font-size:.9rem;color:#666}
.skf-tips li{margin-bottom:6px}
.skf-keys-reference{padding:25px;background:#fff;border:2px solid #ddd;border-radius:8px}
.skf-ref-title{font-weight:700;font-size:1rem;color:#333;margin-bottom:15px;text-align:center}
.skf-keys-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.skf-key-item{padding:12px;background:#f8f9fa;border-left:4px solid #3f51b5;border-radius:6px}
.skf-key-name{font-weight:600;color:#333;font-size:.9rem;margin-bottom:4px}
.skf-key-code{font-size:.85rem;color:#3f51b5;font-family:'Courier New',monospace}
@media (max-width:768px){
.skf-buttons{flex-direction:column}
.skf-btn{width:100%}
.skf-display{grid-template-columns:1fr}
.skf-results{grid-template-columns:repeat(2,1fr)}
.skf-keys-grid{grid-template-columns:1fr}
}