.tuner-panel {
            background: linear-gradient(145deg, #f8f9fc 0%, #eef2f5 100%);
            border-radius: 32px;
            padding: 1.5rem;
            box-shadow: 0 12px 28px rgba(0,0,0,0.08);
            margin: 1.5rem 0;
        }.author-bio{display:block}
        .note-display {
            font-size: 4.5rem;
            font-weight: 800;
            font-family: 'Courier New', 'Fira Mono', monospace;
            text-align: center;
            background: #1e2a3a;
            color: #f0f3f5;
            border-radius: 48px;
            padding: 0.5rem 1rem;
            letter-spacing: 0.04em;
            box-shadow: inset 0 2px 5px rgba(0,0,0,0.2), 0 4px 10px rgba(0,0,0,0.1);
        }
        .freq-display {
            font-size: 1.4rem;
            text-align: center;
            font-family: monospace;
            background: rgba(0,0,0,0.03);
            padding: 0.3rem;
            border-radius: 40px;
        }
        .meter-container {
            background: #2c3e2f;
            border-radius: 50px;
            height: 28px;
            width: 100%;
            overflow: hidden;
            box-shadow: inset 0 1px 4px rgba(0,0,0,0.2);
        }
        .meter-fill {
            width: 50%;
            height: 100%;
            background: linear-gradient(90deg, #e74c3c, #f39c12, #2ecc71);
            transition: width 0.08s linear;
        }
        .cents-value {
            font-weight: 700;
            font-size: 1.8rem;
            font-family: monospace;
        }
        .string-badge {
            display: inline-block;
            background: #4b6584;
            color: white;
            border-radius: 60px;
            padding: 0.3rem 1rem;
            margin: 0.2rem;
            font-size: 0.9rem;
            font-weight: 600;
        }
        .string-badge.active {
            background: #e67e22;
            box-shadow: 0 0 0 2px #f39c12;
        }
        .string-visualizer {
            background: #fef9e6;
            border-radius: 28px;
            padding: 1rem;
            margin-top: 1.2rem;
            border: 1px solid #ffe2b5;
        }
        .strings-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-evenly;
            gap: 0.75rem;
            margin: 1rem 0;
        }
        .string-card {
            background: #2c3e50;
            border-radius: 20px;
            padding: 0.75rem 1rem;
            min-width: 85px;
            text-align: center;
            transition: all 0.2s ease;
            cursor: pointer;
            color: white;
            box-shadow: 0 2px 6px rgba(0,0,0,0.1);
            flex: 1;
        }
        .string-card:hover {
            transform: translateY(-3px);
            background: #3e5a6f;
        }
        .string-card.active-string {
            background: #e67e22;
            box-shadow: 0 0 0 3px #f39c12, 0 4px 12px rgba(0,0,0,0.2);
            transform: scale(1.02);
        }
        .string-card.in-tune {
            background: #27ae60;
            box-shadow: 0 0 0 2px #2ecc71;
        }
        .string-number {
            font-size: 1.3rem;
            font-weight: 800;
            line-height: 1;
        }
        .string-note {
            font-size: 1rem;
            font-family: monospace;
            letter-spacing: 1px;
            background: rgba(255,255,255,0.2);
            display: inline-block;
            padding: 0.2rem 0.6rem;
            border-radius: 40px;
            margin-top: 6px;
        }
        .string-freq {
            font-size: 0.7rem;
            opacity: 0.85;
            margin-top: 4px;
        }
        .tuning-indicator {
            font-size: 0.7rem;
            margin-top: 6px;
        }
        .reference-buttons .btn-ref {
            margin: 0.25rem;
            font-size: 0.85rem;
        }
        .pitch-history {
            font-size: 0.85rem;
            background: #fef9e6;
            border-radius: 20px;
            padding: 0.75rem;
        }
        .status-led {
            display: inline-block;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background-color: #aaa;
            margin-right: 8px;
            box-shadow: 0 0 2px rgba(0,0,0,0.3);
        }
        .status-led.active {
            background-color: #2ecc71;
            animation: pulse 1.2s infinite;
        }
        @keyframes pulse {
            0% { box-shadow: 0 0 0 0 rgba(46,204,113,0.4); }
            70% { box-shadow: 0 0 0 6px rgba(46,204,113,0); }
            100% { box-shadow: 0 0 0 0 rgba(46,204,113,0); }
        }
        .tuner-section-title {
            font-weight: 700;
            border-left: 5px solid #e67e22;
            padding-left: 1rem;
            margin: 1.8rem 0 1rem 0;
        }
        .guitar-diagram {
            background: #ebd5b3;
            border-radius: 48px;
            text-align: center;
            padding: 1rem;
            font-family: monospace;
        }
        .btn-tuner {
            background: #2c3e50;
            border: none;
            color: white;
        }
        .btn-tuner:hover {
            background: #e67e22;
        }
        .warning-box {
            background-color: #fff3e0;
            border-left: 6px solid #e67e22;
        }
        .accuracy-note {
            background: #e9ecef;
            border-radius: 20px;
            padding: 0.8rem 1rem;
            font-size: 0.85rem;
            border-left: 4px solid #e67e22;
        }