:root{--verde: #009246;--bianco: #ffffff;--rosso: #ce2b37;--bg: #f8f9fa;--surface: #ffffff;--text: #1a1a2e;--text-muted: #6c757d;--border: #e2e8f0;--shadow: 0 2px 8px rgba(0, 0, 0, .08);--radius: 12px;--font: "Segoe UI", system-ui, -apple-system, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}#root{max-width:480px;margin:0 auto;min-height:100vh;padding:16px}h1{font-size:1.75rem;font-weight:700;margin-bottom:8px}h2{font-size:1.35rem;font-weight:600;margin-bottom:12px}h3{font-size:1.1rem;font-weight:600;margin-bottom:8px}p{margin-bottom:8px}.text-muted{color:var(--text-muted);font-size:.9rem}.text-it{font-style:italic;color:var(--verde)}.card{background:var(--surface);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:var(--shadow);border:1px solid var(--border)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border:none;border-radius:var(--radius);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;text-decoration:none}.btn:active{transform:scale(.97)}.btn-primary{background:var(--verde);color:var(--bianco)}.btn-primary:hover{background:#007a3a}.btn-secondary{background:var(--border);color:var(--text)}.btn-secondary:hover{background:#d1d5db}.btn-danger{background:var(--rosso);color:var(--bianco)}.btn-record{width:64px;height:64px;border-radius:50%;background:var(--rosso);color:#fff;font-size:1.5rem;border:3px solid #ff6b7a}.btn-record.recording{animation:pulse 1.2s infinite;background:#ff4757}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.08)}}.audio-pair{display:flex;gap:8px;align-items:center;flex-shrink:0}.btn-play{width:44px;height:44px;border-radius:50%;background:var(--verde);color:#fff;font-size:1.2rem;flex-shrink:0;transition:transform .1s ease,background .2s ease}.btn-play.playing{animation:pulse 1s infinite}.btn-slow{background:#6c757d;font-size:1.1rem}.btn-fast{background:var(--verde);font-size:1.1rem}.trail-badge{display:inline-block;padding:4px 10px;border-radius:20px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.trail-bambino{background:#d4edda;color:#155724}.trail-viaggio{background:#cce5ff;color:#004085}.trail-vivere{background:#fff3cd;color:#856404}.feedback-axis{padding:12px;border-left:4px solid var(--border);margin-bottom:8px;background:var(--bg);border-radius:0 var(--radius) var(--radius) 0}.feedback-axis.success{border-left-color:var(--verde)}.feedback-axis.warning{border-left-color:#ffc107}.feedback-axis.error{border-left-color:var(--rosso)}.natural-version{background:#e8f5e9;padding:10px 14px;border-radius:var(--radius);margin:8px 0;font-size:1.05rem}.natural-version:before{content:"🇮🇹 Um italiano diria: ";font-weight:700;font-size:.85rem;display:block;margin-bottom:4px;color:var(--verde)}.voice-booth{text-align:center;padding:24px 16px;background:linear-gradient(135deg,#f8f9fa,#e8f5e9);border-radius:var(--radius);margin:16px 0}.voice-booth p{margin-bottom:16px;font-size:1.1rem}.grammar-error{padding:8px 12px;background:#fff3cd;border-radius:8px;margin-bottom:6px;font-size:.9rem}.grammar-error .fix{color:var(--verde);font-weight:600}.grammar-error.blocks_understanding{background:#f8d7da}.flashcard{perspective:1000px;min-height:200px;cursor:pointer}.flashcard-inner{background:var(--surface);border-radius:var(--radius);padding:32px 24px;text-align:center;box-shadow:var(--shadow);border:2px solid var(--border);min-height:200px;display:flex;flex-direction:column;align-items:center;justify-content:center}.flashcard-inner .it{font-size:1.4rem;font-weight:600;color:var(--verde);margin-bottom:8px}.flashcard-inner .pt{font-size:1rem;color:var(--text-muted)}.rating-buttons{display:flex;gap:8px;justify-content:center;margin-top:16px}.rating-btn{width:44px;height:44px;border-radius:50%;border:2px solid var(--border);background:var(--surface);font-weight:700;cursor:pointer;transition:all .15s}.rating-btn:hover{border-color:var(--verde);color:var(--verde)}.rating-btn.selected{background:var(--verde);color:#fff;border-color:var(--verde)}.loading{text-align:center;padding:40px;color:var(--text-muted)}.error-banner{background:#f8d7da;color:#721c24;padding:12px 16px;border-radius:var(--radius);margin-bottom:16px}.nav-bar{display:flex;gap:8px;margin-bottom:20px;overflow-x:auto;padding-bottom:4px}.nav-tab{padding:8px 16px;border-radius:20px;border:1px solid var(--border);background:var(--surface);font-size:.9rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:all .2s}.nav-tab.active{background:var(--verde);color:#fff;border-color:var(--verde)}.chunk-item{display:flex;align-items:center;gap:12px;padding:12px;border-bottom:1px solid var(--border)}.chunk-item:last-child{border-bottom:none}.chunk-text{flex:1}.chunk-text .it{font-weight:600;color:var(--verde)}.chunk-text .pt{font-size:.85rem;color:var(--text-muted)}.pronuncia-tip{font-size:.78rem;color:var(--rosso);background:#ce2b3712;border-left:3px solid var(--rosso);padding:4px 8px;margin-top:4px;border-radius:0 6px 6px 0}.dialogue-line{display:flex;gap:10px;align-items:flex-start;padding:10px 0}.dialogue-line.learner{flex-direction:row-reverse}.dialogue-bubble{max-width:80%;padding:10px 14px;border-radius:16px;font-size:.95rem}.dialogue-line.italian .dialogue-bubble{background:#e8f5e9;border-bottom-left-radius:4px}.dialogue-line.learner .dialogue-bubble{background:#e3f2fd;border-bottom-right-radius:4px}.dissent-btn{margin-top:12px;padding:8px 16px;background:transparent;border:1px dashed var(--text-muted);border-radius:8px;color:var(--text-muted);font-size:.85rem;cursor:pointer}.dissent-btn:hover{border-color:var(--verde);color:var(--verde)}.app-header{display:flex;align-items:center;gap:12px;margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid var(--verde)}.app-header h1{margin:0;font-size:1.5rem}.flag{display:inline-flex;width:32px;height:22px;border-radius:3px;overflow:hidden}.flag span{flex:1}.flag .green{background:var(--verde)}.flag .white{background:var(--bianco);border:1px solid #ddd}.flag .red{background:var(--rosso)}