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#06b6d4;--text-color: #f1f5f9;--light-text-color: #94a3b8;--background-color: #0f172a;--card-bg-color: #1e293b;--border-color: #334155;--slider-bg: #374151;--slider-fill: linear-gradient(135deg, #7c3aed, #06b6d4);--active-button: #6d28d9;--disabled-color: #64748b;--success-color: #10b981;--warning-color: #f59e0b;--error-color: #ef4444;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -1px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -2px rgba(0, 0, 0, .4);--header-gradient: linear-gradient(135deg, #7c3aed, #06b6d4)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica 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var(--transition-speed)}.email-link:hover{text-decoration:underline;color:var(--primary-dark)}.disclaimer{font-size:.9rem;color:var(--light-text-color);font-style:italic;padding:15px;background-color:#5e72e408;border-radius:8px}.footer{margin-top:40px;text-align:center;color:var(--light-text-color);font-size:.9rem;padding:25px 0;border-top:1px solid var(--border-color);width:100%;background-color:var(--card-bg-color);transition:background-color .3s ease,color .3s ease}.connection-status{margin:8px 0;font-size:.85rem;color:var(--light-text-color)}.patent-footer{margin-top:8px;font-size:.85rem;color:var(--text-color);font-weight:500}.email-footer{color:var(--primary-color);text-decoration:none;font-weight:600;transition:color var(--transition-speed)}.email-footer:hover{text-decoration:underline;color:var(--primary-light)}.frequency-title{font-size:1.8rem;margin-bottom:15px;text-align:center;color:var(--primary-color);font-weight:700;width:100%;letter-spacing:.5px}@keyframes 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var(--border-color);border-radius:12px;padding:16px;transition:all .2s ease}.tone-control-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--primary-color)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.card-header h4{margin:0;color:var(--text-color);font-size:1.1rem;font-weight:600}.play-button{width:56px;height:56px;border:3px solid var(--primary-color);border-radius:50%;background:#6366f11a;color:var(--primary-color);font-size:18px;font-weight:700;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px #6366f133;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.play-button:hover{background:var(--primary-color);color:#fff;transform:scale(1.08);box-shadow:0 4px 16px #6366f166;border-color:var(--primary-color)}.play-button.playing{background:var(--primary-color);color:#fff;animation:pulse 2s 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