/* Variables CSS optimizadas para tema profesional de disquera */
:root {
    --primary-black: #0a0a0a;
    --secondary-black: #1a1a1a;
    --accent-gold: #d4af37;
    --accent-gold-light: #f4d03f;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --text-tertiary: #808080;
    --glass-backdrop: rgba(0, 0, 0, 0.8);
    --glass-border: rgba(212, 175, 55, 0.2);
    --shadow-gold: 0 10px 40px rgba(212, 175, 55, 0.3);
    --shadow-dark: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: 300;
}

.dynamic-background {
    position: fixed;
    top: -20px;
    left: -20px;
    width: calc(100% + 40px);
    height: calc(100% + 40px);
    z-index: -1;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    
    filter: blur(12px) brightness(0.32);
    overflow: hidden;
}

/* Contenedor principal */
.container {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* Contenedor de imagen y controles */
.image-container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
    height: 100%;
}

/* Imagen principal (vinyl) */
#song-image {
    width: min(50vh, 50vw);
    height: min(50vh, 50vw);
    object-fit: cover;
    border-radius: 50%;
    border: 6px solid var(--accent-gold);
    box-shadow: 
        var(--shadow-gold),
        inset 0 0 0 15px rgba(0, 0, 0, 0.3),
        inset 0 0 0 16px var(--accent-gold);
    animation: rotate 20s linear infinite;
    position: relative;
    z-index: 1;
}

/* Círculo central del vinyl */
#song-image::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, var(--accent-gold) 0%, #8b7355 70%, var(--primary-black) 100%);
    border-radius: 50%;
    z-index: 2;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Panel de información - posicionado a la derecha */
.info-panel {
    position: absolute;
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
    background: var(--glass-backdrop);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    width: 300px;
    max-height: 70vh;
    overflow-y: auto;
    border-radius: 8px;
    z-index: 10;
}

.info-panel::-webkit-scrollbar {
    width: 4px;
}

.info-panel::-webkit-scrollbar-track {
    background: transparent;
}

.info-panel::-webkit-scrollbar-thumb {
    background: var(--accent-gold);
    border-radius: 2px;
}

.info-panel h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 300;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.info-panel p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 300;
    line-height: 1.5;
}

.info-panel p:first-of-type {
    color: var(--accent-gold);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 400;
}

#songNote {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    font-style: italic;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}

/* Panel de controles - posicionado en la parte inferior */
.controls-panel {
    position: absolute;
    bottom: 8%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--glass-backdrop);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 0.72rem 2rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 2rem;
    z-index: 10;
}

.controls-panel > div {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.controls-panel button {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.8rem 1.2rem;
    font-size: 0.8rem;
    font-weight: 300;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 25px;
    min-width: 80px;
}

.controls-panel button:hover {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    background: rgba(212, 175, 55, 0.1);
    transform: translateY(-2px);
}

.controls-panel button:active {
    transform: translateY(0);
}

/* Botón de play/pause especial */
#play-pause-btn {
    background: var(--accent-gold) !important;
    color: var(--primary-black) !important;
    font-weight: 500;
    font-size: 1.2rem;
    padding: 1rem 1.5rem !important;
    width: 60px;
    height: 60px;
    border-radius: 50% !important;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: auto;
}

#play-pause-btn:hover {
    background: var(--accent-gold-light) !important;
    color: var(--primary-black) !important;
    transform: scale(1.1);
}

/* Slider de volumen */
#volume-slider {
    width: 100px;
    height: 4px;
    background: var(--glass-border);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    border-radius: 2px;
    margin-left: 1rem;
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-gold);
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px rgba(212, 175, 55, 0.3);
}

#volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.6);
}

#volume-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent-gold);
    cursor: pointer;
    border-radius: 50%;
    border: none;
    transition: all 0.2s ease;
}

/* Panel inicial */
.panel-inicial {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(15px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.panel-inicial > div {
    background: var(--glass-backdrop);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    text-align: center;
    max-width: 500px;
    border-radius: 12px;
    position: relative;
}

.panel-inicial > div::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
}

.panel-inicial h1 {
    font-size: 2.5rem;
    color: var(--accent-gold);
    font-weight: 200;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 4px;
}

.panel-inicial p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 300;
    line-height: 1.6;
}

.cerrar-panel-inicial {
    background: var(--accent-gold);
    border: none;
    color: var(--primary-black);
    padding: 1rem 2.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    margin-top: 2rem;
    transition: all 0.3s ease;
    border-radius: 30px;
}

.cerrar-panel-inicial:hover {
    background: var(--accent-gold-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

/* Botón para abrir panel inicial */
.button-panel-inicial {
    position: fixed;
    top: 2rem;
    left: 2rem;
    background: var(--glass-backdrop);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    font-size: 0.8rem;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    z-index: 100;
    transition: all 0.3s ease;
    border-radius: 25px;
}

.button-panel-inicial:hover {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    transform: translateY(-2px);
}

/* Ocultar elementos de fondo que no están en uso */
.background-panel,
.back-img {
    display: none;
}

/* Ocultar el reproductor de audio */
#audio-player {
    display: none;
}

/* Estados de reproducción */
.paused #song-image {
    animation-play-state: paused;
}

.loading #song-image {
    opacity: 0.7;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .info-panel {
        width: 280px;
        right: 3%;
    }

    #song-image {
        width: min(45vh, 45vw);
        height: min(45vh, 45vw);
    }
}

@media (max-width: 1000px) {
    .info-panel {
        position: absolute;
        top: 2rem;
        right: 2rem;
        width: 260px;
        max-height: 300px;
    }

    .controls-panel {
        bottom: 5%;
        gap: 1.5rem;
        padding: 1rem 1.5rem;
    }

    #song-image {
        width: min(40vh, 50vw);
        height: min(40vh, 50vw);
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
        padding: 2rem 1rem;
    }

    .image-container {
        flex-direction: column;
        gap: 2rem;
    }

    .info-panel {
        position: relative;
        top: 0;
        right: 0;
        transform: none;
        width: 100%;
        max-width: 400px;
        max-height: none;
        order: 2;
    }

    .controls-panel {
        position: relative;
        bottom: auto;
        left: auto;
        transform: none;
        order: 3;
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
        border-radius: 15px;
        padding: 1rem;
        gap: 1rem;
    }

    .controls-panel > div {
        gap: 0.5rem;
    }

    .controls-panel button {
        padding: 0.6rem 1rem;
        font-size: 0.7rem;
        min-width: 70px;
    }

    #play-pause-btn {
        width: 50px !important;
        height: 50px !important;
        padding: 0.8rem !important;
        font-size: 1rem !important;
    }

    #volume-slider {
        width: 80px;
        margin-left: 0.5rem;
    }

    #song-image {
        width: min(60vw, 250px);
        height: min(60vw, 250px);
        order: 1;
    }

    .panel-inicial > div {
        margin: 1rem;
        padding: 2rem;
    }

    .panel-inicial h1 {
        font-size: 2rem;
        letter-spacing: 2px;
    }
}

@media (max-width: 480px) {
    .controls-panel {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .controls-panel > div:first-child {
        order: 2;
    }

    .controls-panel > div:nth-child(2) {
        order: 1;
    }

    .controls-panel > div:last-child {
        order: 3;
        justify-content: center;
        width: 100%;
    }

    #song-image {
        width: min(70vw, 200px);
        height: min(70vw, 200px);
    }

    .info-panel {
        padding: 1.5rem;
    }

    .info-panel h2 {
        font-size: 1.3rem;
    }

    .button-panel-inicial {
        top: 1rem;
        left: 1rem;
        padding: 0.6rem 1rem;
        font-size: 0.7rem;
    }
}

/* Animación suave para cambios de estado */
.container * {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Efecto de enfoque para accesibilidad */
button:focus,
input:focus {
    outline: 2px solid var(--accent-gold);
    outline-offset: 2px;
}

/* Mejora visual para botones deshabilitados */
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

button:disabled:hover {
    color: var(--text-primary);
    border-color: var(--glass-border);
    background: rgba(26, 26, 26, 0.8);
}

/* Estilos para elementos creados dinámicamente en JavaScript */

/* Panel de Tracks */
.panel-tracks {
    position: fixed;
    top: 50%;
    left: 2rem;
    transform: translateY(-50%);
    background: var(--glass-backdrop);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    width: 280px;
    max-height: 70vh;
    overflow-y: auto;
    border-radius: 8px;
    z-index: 100;
    box-shadow: var(--shadow-dark);
}

.panel-tracks::-webkit-scrollbar {
    width: 4px;
}

.panel-tracks::-webkit-scrollbar-track {
    background: transparent;
}

.panel-tracks::-webkit-scrollbar-thumb {
    background: var(--accent-gold);
    border-radius: 2px;
}

.panel-tracks p {
    color: var(--accent-gold);
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    text-align: center;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.panel-tracks ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.panel-tracks li {
    margin-bottom: 0.5rem;
}

.panel-tracks a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.8rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 300;
    line-height: 1.4;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    border: 1px solid transparent;
}

.panel-tracks a:hover {
    color: var(--text-primary);
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--glass-border);
    transform: translateX(5px);
}

.panel-tracks a:active {
    background: rgba(212, 175, 55, 0.2);
    transform: translateX(2px);
}

/* Contenedor de botones de descarga y donación */
.button-container {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
}

/* Botón de descarga */
.download-btn {
    background: linear-gradient(145deg, var(--accent-gold), #b8860b);
    border: 1px solid rgba(212, 175, 55, 0.3);
    color: var(--primary-black);
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
    overflow: hidden;
    border-radius: 0;
    min-width: 120px;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.download-btn:hover::before {
    left: 100%;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.2);
    background: linear-gradient(145deg, var(--accent-gold-light), var(--accent-gold));
}

.download-btn:active {
    transform: translateY(0);
}

/* Botón de PayPal */
.paypal-btn {
    background: linear-gradient(145deg, var(--secondary-black), var(--primary-black));
    border: 1px solid rgba(212, 175, 55, 0.3);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    position: relative;
    overflow: hidden;
    border-radius: 0;
    min-width: 120px;
}

.paypal-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.1), transparent);
    transition: left 0.5s;
}

.paypal-btn:hover::before {
    left: 100%;
}

.paypal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.2);
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    background: linear-gradient(145deg, rgba(212, 175, 55, 0.1), var(--secondary-black));
}

.paypal-btn:active {
    transform: translateY(0);
}

/* Contenedor de autoplay */
.controls-panel > div:last-child {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

/* Checkbox de autoplay */
#autoplay-checkbox {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-gold);
    cursor: pointer;
    transition: all 0.2s ease;
}

#autoplay-checkbox:hover {
    transform: scale(1.1);
}

#autoplay-checkbox:focus {
    outline: 2px solid var(--accent-gold);
    outline-offset: 2px;
}

/* Label de autoplay */
label[for="autoplay-checkbox"] {
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s ease;
}

label[for="autoplay-checkbox"]:hover {
    color: var(--accent-gold);
}

/* Efectos visuales para el background panel cuando está activo */
.background-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: blur(12px);
    opacity: 0.1;
    z-index: -2;
    transition: all 0.5s ease;
}

.background-panel.active {
    opacity: 0.3;
    transform: scale(1.05);
}

/* Responsive para panel de tracks */
@media (max-width: 1200px) {
    .panel-tracks {
        width: 260px;
        left: 1.5rem;
    }
}

@media (max-width: 1000px) {
    .panel-tracks {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        max-height: none;
        transform: none;
        border-radius: 0;
        background: rgba(10, 10, 10, 0.95);
        backdrop-filter: blur(20px);
        z-index: 1000;
        padding: 2rem;
        overflow-y: auto;
    }

    .panel-tracks p {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }

    .panel-tracks a {
        padding: 1rem 1.5rem;
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
        border: 1px solid var(--glass-border);
        border-radius: 8px;
    }
}

@media (max-width: 768px) {
    .button-container {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }

    .download-btn,
    .paypal-btn {
        width: 100%;
        max-width: 200px;
        padding: 1rem 1.5rem;
    }

    .panel-tracks {
        padding: 1.5rem;
    }

    .panel-tracks a {
        font-size: 0.9rem;
        padding: 0.8rem 1rem;
    }
}

@media (max-width: 480px) {
    .button-container {
        margin-top: 1.5rem;
        padding-top: 1.5rem;
    }

    .download-btn,
    .paypal-btn {
        font-size: 0.8rem;
        padding: 0.8rem 1.2rem;
    }

    .panel-tracks {
        padding: 1rem;
    }

    .panel-tracks p {
        font-size: 1rem;
    }

    .panel-tracks a {
        font-size: 0.85rem;
        padding: 0.7rem 0.8rem;
    }
}

/* Animaciones adicionales */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.panel-tracks[style*="block"] {
    animation: slideInLeft 0.3s ease-out;
}

/* Estados especiales */
.button-container.loading .download-btn,
.button-container.loading .paypal-btn {
    opacity: 0.7;
    cursor: not-allowed;
    pointer-events: none;
}

/* Mejoras de accesibilidad */
@media (prefers-reduced-motion: reduce) {
    .panel-tracks a,
    .download-btn,
    .paypal-btn,
    #autoplay-checkbox {
        transition: none;
    }
    
    .download-btn::before,
    .paypal-btn::before {
        display: none;
    }
}

/* Tema oscuro adicional */
@media (prefers-color-scheme: dark) {
    .panel-tracks {
        background: rgba(0, 0, 0, 0.9);
    }
    
    .download-btn {
        box-shadow: 0 4px 15px rgba(212, 175, 55, 0.1);
    }
    
    .paypal-btn {
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }
}