body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #e6e0d4;
    color: #e0e0e0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

h2 {
    color: #000000;
    margin-bottom: 10px;
}

.vst-container {
    background: linear-gradient(145deg, #3a4149, #23282e 60%, #15181c 100%);
    color: #e0e0e0;
    padding: 25px;
    border-radius: 14px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4), inset 0 1px 2px rgba(255, 255, 255, 0.25), inset 0 -2px 5px rgba(0, 0, 0, 0.6);
    border: 1px solid #5a6572;
    max-width: 95%;
    margin: 20px auto;
    box-sizing: border-box;
}

.title-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 10px;
}

h1 {
    margin: 0;
    font-size: 1.3rem;
    color: #ffffff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}

#status {
    font-size: 0.85rem;
    color: #a3e635;
    background: rgba(34, 197, 94, 0.15);
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid rgba(34, 197, 94, 0.4);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.2);
}

.chord-display-panel {
    background: linear-gradient(to bottom, #090d10, #131a21);
    border: 1px solid #2a3744;
    border-radius: 8px;
    padding: 12px 20px;
    margin-bottom: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
    box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.8), 0 1px 2px rgba(255, 255, 255, 0.05);
}

.chord-info-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.chord-label {
    font-size: 0.75rem;
    color: #8a99ad;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chord-name {
    font-size: 1.6rem;
    font-weight: bold;
    color: #00bcd4;
    min-height: 35px;
    text-shadow: 0 0 10px rgba(0, 188, 212, 0.4);
}

.notes-detected {
    font-size: 1.1rem;
    color: #d1d5db;
    background: #0d1318;
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid #22303c;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.6);
}

/* ========================================
   CONTROLES PRINCIPALES
   ======================================== */
.controls-row {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    background: linear-gradient(to bottom, #252b33, #1c2229);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #36414f;
    align-items: flex-end;
    margin-bottom: 15px;
    box-shadow: inset 0 1px 2px rgba(255,255,255,0.08), 0 4px 6px rgba(0,0,0,0.2);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex: 1;
    min-width: 140px;
}

label {
    font-size: 0.8rem;
    color: #94a3b8;
    font-weight: bold;
    text-shadow: 0 1px 1px rgba(0,0,0,0.5);
}

select {
    background: linear-gradient(to bottom, #1e242b, #11151a);
    color: #fff;
    border: 1px solid #3b4754;
    padding: 8px;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    width: 100%;
    box-sizing: border-box;
    box-shadow: inset 0 2px 3px rgba(0,0,0,0.5), 0 1px 2px rgba(255,255,255,0.05);
}

select:hover {
    border-color: #00bcd4;
}

select option {
    background-color: #1a202c;
    color: #ffffff;
    padding: 8px;
}

/* ========================================
   SLIDERS VERTICALES CON RAYITAS
   ======================================== */
.vertical-slider-group {
    align-items: center;
    text-align: center;
    min-width: 90px;
    flex: 0 0 90px;
}

.vertical-slider-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    height: 110px;
}

.vertical-slider-value {
    font-size: 0.75rem;
    color: #00bcd4;
    text-shadow: 0 0 4px rgba(0,188,212,0.3);
    background: #0d1318;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #22303c;
    min-width: 35px;
    text-align: center;
}

.vertical-slider-wrapper {
    position: relative;
    width: 40px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Línea vertical de fondo */
.vertical-slider-wrapper::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    transform: translateX(-50%);
    background: linear-gradient(to bottom, #1a202c, #0a0d10);
    border-radius: 2px;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.8);
    z-index: 0;
}

/* Rayitas horizontales (5 niveles) */
.vertical-slider-wrapper::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    width: 14px;
    height: 90px;
    transform: translateX(-50%);
    background: repeating-linear-gradient(
        to bottom,
        transparent 0px,
        transparent 16px,
        #00bcd4 16px,
        #00bcd4 18px,
        transparent 18px,
        transparent 90px
    );
    z-index: 0;
    opacity: 0.7;
}

.vertical-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 90px;
    height: 6px;
    border-radius: 3px;
    background: transparent;
    outline: none;
    cursor: pointer;
    transform: rotate(-90deg);
    transform-origin: center center;
    position: absolute;
    z-index: 1;
}

.vertical-slider::-webkit-slider-runnable-track {
    background: transparent;
    height: 6px;
}

.vertical-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #4a5568, #1a202c 70%);
    border: 2px solid #00bcd4;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.6), 0 0 8px rgba(0,188,212,0.4);
    margin-top: -8px;
}

.vertical-slider::-moz-range-track {
    background: transparent;
    height: 6px;
}

.vertical-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #4a5568, #1a202c 70%);
    border: 2px solid #00bcd4;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.6), 0 0 8px rgba(0,188,212,0.4);
}

/* ========================================
   SECCIÓN PAD CON KNOB
   ======================================== */
.pad-section-group {
    border: 1px solid #36414f;
    padding: 10px;
    border-radius: 8px;
    background: linear-gradient(to bottom, #2a1515, #221212);
    min-width: 150px;
    flex: 0 0 150px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: inset 0 1px 2px rgba(255,255,255,0.05);
}

.pad-title {
    color: #ff8c00 !important;
    font-weight: bold;
    font-size: 0.8rem;
    text-align: center;
    text-shadow: 0 1px 1px rgba(0,0,0,0.5);
}

.pad-controls-top {
    display: flex;
    gap: 6px;
    align-items: center;
    justify-content: center;
}

.pad-controls-top button {
    padding: 5px 10px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.75rem;
    border-radius: 4px;
    border: 1px solid #555;
    background: linear-gradient(to bottom, #555, #333);
    color: #fff;
    box-shadow: inset 0 1px 2px rgba(255,255,255,0.2);
}

.pad-controls-top select {
    background: linear-gradient(to bottom, #1e242b, #11151a);
    color: #fff;
    border: 1px solid #3b4754;
    padding: 4px;
    border-radius: 4px;
    font-size: 0.75rem;
}

.pad-knob-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 5px;
}

.pad-knob-label {
    font-size: 0.7rem;
    color: #94a3b8;
}

.pad-knob {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #4a5568, #1a202c 70%);
    border: 2px solid #64748b;
    position: relative;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.6), inset 0 2px 3px rgba(255,255,255,0.2), inset 0 -2px 3px rgba(0,0,0,0.6);
    transition: border-color 0.2s;
}

.pad-knob:hover {
    border-color: #ff8c00;
}

.pad-knob-indicator {
    position: absolute;
    width: 3px;
    height: 12px;
    background: #ff8c00;
    border-radius: 2px;
    top: 3px;
    left: calc(50% - 1.5px);
    transform-origin: bottom center;
    transform: translateX(-50%);
    box-shadow: 0 0 6px #ff8c00;
    transition: transform 0.2s ease;
}

.pad-knob-value {
    font-size: 0.75rem;
    color: #ff8c00;
    font-weight: bold;
    text-shadow: 0 0 4px rgba(255,140,0,0.4);
    min-width: 15px;
}

/* ========================================
   PIANO (Estilo de referencia)
   ======================================== */
.piano-wrapper {
    overflow-x: auto;
    max-width: 100%;
    padding-bottom: 10px;
    -webkit-overflow-scrolling: touch;
}

.piano {
    display: block;
    position: relative;
    background: linear-gradient(to bottom, #0a0d10, #000000);
    padding: 12px 10px;
    border-radius: 8px;
    height: 200px;
    box-shadow: inset 0 10px 20px rgba(0,0,0,0.9), 0 8px 16px rgba(0,0,0,0.5);
    border: 1px solid #222b35;
}

.key {
    position: absolute;
    cursor: pointer;
    border-radius: 0 0 5px 5px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    box-sizing: border-box;
    transition: background 0.1s, box-shadow 0.1s;
}
/* Tamaño para las letras de las teclas negras */
.key.black span {
    font-size: 0.8rem; 
}

.white {
    width: 36px;
    height: 180px;
    background: linear-gradient(to bottom, #eeeeee 0%, #ffffff 70%, #dcdcdc 100%);
    border: 1px solid #9ca3af;
    color: #4b5563;
    z-index: 1;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), 0 4px 6px rgba(0,0,0,0.4);
}

.white:hover {
    background: linear-gradient(to bottom, #e2e8f0, #f8fafc);
}

.white.active {
    background: linear-gradient(to bottom, #00acc1, #00bcd4) !important;
    color: #000 !important;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.4), 0 0 12px #00bcd4 !important;
}

.black {
    width: 22px;
    height: 110px;
    background: linear-gradient(to bottom, #374151 0%, #111827 30%, #030712 100%);
    color: #9ca3af;
    z-index: 3;
    border-radius: 0 0 3px 3px;
    border: 1px solid #000;
    font-size: 0.5rem;
    box-shadow: inset 0 1px 1px rgba(255,255,255,0.2), 0 4px 6px rgba(0,0,0,0.7);
}

.black:hover {
    background: linear-gradient(to bottom, #4b5563, #1f2937);
}

.black.active {
    background: linear-gradient(to bottom, #f97316, #ea580c) !important;
    color: #fff !important;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.5), 0 0 12px #ff5722 !important;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .controls-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .control-group, .vertical-slider-group, .pad-section-group {
        width: 100%;
        flex: 1 1 100%;
    }
    
    .vertical-slider-container {
        flex-direction: row;
        height: auto;
        justify-content: center;
        gap: 15px;
    }
    
    .vertical-slider-wrapper {
        width: 90px;
        height: 40px;
    }
    
    .vertical-slider {
        width: 90px;
        height: 6px;
        transform: none;
        position: relative;
    }
    
    .vertical-slider-wrapper::before {
        width: 100%;
        height: 4px;
        top: 50%;
        left: 0;
        right: 0;
        bottom: auto;
        transform: translateY(-50%);
    }
    
    .vertical-slider-wrapper::after {
        width: 90px;
        height: 14px;
        top: 50%;
        left: 0;
        right: 0;
        bottom: auto;
        transform: translateY(-50%);
        background: repeating-linear-gradient(
            to right,
            transparent 0px,
            transparent 16px,
            #00bcd4 16px,
            #00bcd4 18px,
            transparent 18px,
            transparent 90px
        );
    }
    
    .piano {
        height: 180px;
    }
    
    .white {
        height: 160px;
    }
    
    .black {
        height: 95px;
    }
}
.staff-container {
    background: #0a0d10;
    border: 1px solid #222b35;
    border-radius: 8px;
    padding: 5px;
    margin-top: 5px;
    overflow-x: auto;
    display: flex;
    justify-content: center;
}

#music-staff {
    display: block;
    max-width: 100%;
    margin-top: 30px;
}
/* ========================================
   BOTÓN DE SUSTAIN
   ======================================== */
.sustain-button-group {
    align-items: center;
    text-align: center;
    min-width: 100px;
    flex: 0 0 100px;
}

.sustain-btn-off, .sustain-btn-on {
    padding: 10px 20px;
    cursor: pointer;
    font-weight: bold;
    font-size: 0.85rem;
    border-radius: 6px;
    border: 1px solid #555;
    transition: all 0.2s;
    text-shadow: 0 1px 1px rgba(0,0,0,0.5);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.sustain-btn-off {
    background: linear-gradient(to bottom, #555, #333);
    color: #fff;
}

.sustain-btn-off:hover {
    background: linear-gradient(to bottom, #666, #444);
    border-color: #00bcd4;
}

.sustain-btn-on {
    background: linear-gradient(to bottom, #00bcd4, #0097a7);
    color: #000;
    border-color: #00bcd4;
    box-shadow: 0 0 10px rgba(0, 188, 212, 0.5);
}

.sustain-btn-on:hover {
    background: linear-gradient(to bottom, #26c6da, #00acc1);
}
.paypal-donate-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: #0070ba; /* Color clásico de PayPal o puedes usar tu acento */
            color: #ffffff;
            padding: 10px 20px;
            font-family: 'Inter', sans-serif;
            font-size: 1rem;
            font-weight: 600;
            text-decoration: none;
            border-radius: 8px;
            transition: background-color 0.2s, transform 0.2s;
            box-shadow: 0 4px 12px rgba(0, 112, 186, 0.3);
        }

        .paypal-donate-btn:hover {
            background-color: #005ea6;
            transform: translateY(-2px);
        }

        .paypal-donate-btn svg {
            fill: #ff4757; /* Hace que el icono de corazón destaque en rojo */
            stroke:#ff4757;
        }
         /* ========================================
   POPUP FLOTANTE INDEPENDIENTE
   ======================================== */
.actions-buttons-group {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.collaborators-btn {
    background-color: #d97706;
    border: none;
    cursor: pointer;
}

.collaborators-btn:hover {
    background-color: #b45309;
}

.collaborators-btn svg {
    fill: #fef3c7;
    stroke: #fef3c7;
}

/* Overlay que cubre la pantalla completa de forma flotante */
.collaborators-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    z-index: 99999; /* Asegura que esté por encima de cualquier elemento del piano */
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: 15px;
    box-sizing: border-box;
}

.collaborators-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Caja central del popup */
.collaborators-modal-content {
    background: linear-gradient(145deg, #2a313a, #1a1e23);
    color: #e0e0e0;
    width: 100%;
    max-width: 400px;
    border-radius: 12px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.9), inset 0 1px 2px rgba(255, 255, 255, 0.15);
    border: 1px solid #475569;
    transform: scale(0.85);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.collaborators-modal-overlay.active .collaborators-modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(0, 0, 0, 0.25);
}

.modal-header h3 {
    margin: 0;
    color: #00bcd4;
    font-size: 1.1rem;
}

.close-modal-btn {
    background: none;
    border: none;
    color: #94a3b8;
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
    transition: color 0.2s;
}

.close-modal-btn:hover {
    color: #ffffff;
}

.modal-body {
    padding: 20px;
    max-height: 60vh;
    overflow-y: auto;
}

.collaborators-intro p {
    font-size: 0.9rem;
    color: #cbd5e1;
    line-height: 1.5;
    margin-top: 0;
    margin-bottom: 20px;
}

.collaborators-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.collaborators-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 23, 42, 0.6);
    padding: 12px 16px;
    border-radius: 6px;
    border: 1px solid #334155;
}

.collab-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: #f8fafc;
}

.collab-badge {
    font-size: 0.75rem;
    background: rgba(0, 188, 212, 0.15);
    color: #00bcd4;
    padding: 4px 10px;
    border-radius: 4px;
    border: 1px solid rgba(0, 188, 212, 0.3);
}