:root{--color-primary:#2d5f4f;--color-primary-light:#4a9d7f;--color-sage:#8ba888;--color-green-deep:#4a7c59;--color-success:#4caf50;--color-success-light:#8bc34a;--color-text:#2c3e50;--color-cream:#f8f9f5;--color-border:#e0e0e0;--color-bg-start:#e8f5f1;--color-bg-end:#d4f1e8}*{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;max-width:100vw;overflow-x:hidden}body{background:linear-gradient(135deg, var(--color-bg-start) 0%, var(--color-bg-end) 100%);min-height:100vh;color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.header{background:linear-gradient(135deg, var(--color-primary) 0%, #3d7f6f 100%);color:#fff;z-index:1000;padding:20px;position:sticky;top:0;box-shadow:0 4px 12px #00000026}.header h1{margin-bottom:5px;font-size:24px;font-weight:600}.header p{opacity:.9;font-size:14px}.nav{background:#fff;gap:10px;padding:15px 20px;display:flex;overflow-x:auto;box-shadow:0 2px 8px #0000001a}.nav-button{background:var(--color-cream);color:var(--color-primary);cursor:pointer;white-space:nowrap;border:none;border-radius:8px;padding:10px 20px;font-weight:600;transition:all .3s}.nav-button:hover,.nav-button.active{background:var(--color-primary);color:#fff}.container{box-sizing:border-box;width:100%;max-width:1200px;margin:0 auto;padding:20px;overflow-x:hidden}.section{width:100%;max-width:100%;display:none;overflow-x:hidden}.section.active{animation:.3s fadeIn;display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.dashboard-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-bottom:30px;display:grid}.card{box-sizing:border-box;background:#fff;border-radius:12px;max-width:100%;padding:20px;transition:transform .3s,box-shadow .3s;overflow-x:hidden;box-shadow:0 2px 8px #0000001a}.card:hover{transform:translateY(-4px);box-shadow:0 8px 16px #2d5f4f33}.card 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.3s}.btn-primary{color:#fff;background:#f4a261}.btn-primary:hover{background:#e89b5a}.btn-secondary{background:var(--color-sage);color:#fff}.btn-secondary:hover{background:#7a9777}.btn-danger{color:#fff;background:#e76f51}.btn-danger:hover{background:#d66548}#spectrogramCanvas{background:#000;border-radius:8px;width:100%;height:300px}.spectrogram-info{color:var(--color-sage);justify-content:space-between;margin-top:10px;font-family:monospace;font-size:12px;display:flex}.exercise-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.exercise-card{border-left:4px solid var(--color-primary);cursor:pointer;background:#fff;border-radius:12px;padding:20px;transition:all .3s;position:relative;box-shadow:0 2px 8px #0000001a}.exercise-card:hover{transform:translate(4px);box-shadow:0 4px 12px #2d5f4f33}.exercise-category{border-radius:20px;margin-bottom:10px;padding:4px 12px;font-size:12px;font-weight:600;display:inline-block}.cat-ascolto{color:#2d3436;background:#ffeaa7}.cat-registrazione{color:#2d3436;background:#74b9ff}.cat-editing{color:#fff;background:#a29bfe}.cat-composizione{color:#fff;background:#fd79a8}.exercise-title{color:var(--color-primary);margin-bottom:8px;font-size:18px;font-weight:600}.exercise-meta{color:#666;font-size:13px}.toolkit-section{margin-bottom:30px}.toolkit-section h3{color:var(--color-primary);margin-bottom:15px;font-size:20px}.reference-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px;display:grid}.reference-item{text-align:center;background:#fff;border-radius:8px;padding:15px;transition:all .3s;box-shadow:0 2px 6px #0000001a}.reference-item:hover{transform:translateY(-3px);box-shadow:0 4px 12px #00000026}.reference-modal{z-index:10000;background:#000000b3;width:100%;height:100%;display:none;position:fixed;top:0;left:0;overflow-y:auto}.reference-modal-content{background:#fff;border-radius:12px;max-width:800px;margin:50px auto;padding:30px;position:relative}.reference-modal-close{cursor:pointer;color:#666;font-size:30px;position:absolute;top:15px;right:20px}.reference-modal-close:hover{color:var(--color-primary)}.frequency-bar{border-radius:8px;height:60px;margin:20px 0;display:flex;overflow:hidden;box-shadow:0 2px 8px #0000001a}.frequency-section{color:#fff;text-align:center;justify-content:center;align-items:center;padding:5px;font-size:11px;font-weight:700;display:flex;position:relative}.eq-diagram{background:#f5f5f5;border-radius:8px;margin:15px 0;padding:20px}.equipment-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin-top:20px;display:grid}.equipment-card{border-left:4px solid 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var(--color-border);color:#666;cursor:pointer;background:#fff;border-radius:18px;padding:8px 14px;font-size:12px;font-weight:500;transition:all .3s}.advanced-filter-btn:hover{border-color:var(--color-green-deep);background:#f0f5f2}.advanced-filter-btn.active{border-color:var(--color-green-deep);background:var(--color-green-deep);color:#fff}.example-image-card{transition:transform .3s,box-shadow .3s}.example-image-card:hover{transform:translateY(-4px)}.example-image-card canvas{transition:border-color .3s}.example-image-card:hover canvas{box-shadow:0 4px 8px #2d5f4f4d;border-color:var(--color-primary)!important}.section-footer{text-align:center;background:#fff;border-radius:12px;margin-top:40px;padding:30px 20px;box-shadow:0 2px 8px #0000001a}.footer-buttons{flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:20px;display:flex}.footer-btn{cursor:pointer;border:none;border-radius:8px;align-items:center;gap:8px;padding:12px 24px;font-size:14px;font-weight:600;text-decoration:none;transition:all .3s;display:inline-flex}.footer-btn.whatsapp{color:#fff;background:#25d366}.footer-btn.whatsapp:hover{background:#1da851}.footer-btn.facebook{color:#fff;background:#1877f2}.footer-btn.facebook:hover{background:#145dbf}.footer-btn.paypal{color:#003087;background:#ffc439}.footer-btn.paypal:hover{background:#e6b033}.footer-btn.feedback{background:var(--color-primary);color:#fff}.footer-btn.feedback:hover{background:#1f4538}.footer-credits{color:#333;text-align:center;background:#f8f8f8;border-radius:8px;margin-top:20px;padding:20px 15px;font-size:15px;line-height:1.6}.footer-credits strong{color:#000;font-weight:600;text-decoration:none}.leaflet-popup-content-wrapper{box-sizing:border-box!important;max-width:calc(100vw - 60px)!important}.leaflet-popup-content{box-sizing:border-box!important;word-wrap:break-word!important;max-width:100%!important;overflow:hidden!important}.leaflet-container{max-width:100%!important}