/* 1. RESET Y COLORES BASE */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Roboto, sans-serif;
        }

        :root {
            --highway-yellow: #cdd8e3;
            --midnight-blue: #2c3e50;
            --bone-white: #F9F8F4;
            --text-dark: #333333;
        }

        body {
            background-color: #f0f3f7;
            color: var(--text-dark);
            line-height: 1.6;
            padding-bottom: 150px; 
        }

        /* 2. NAVEGACIÓN */
        header {
            background-color: #2c3e50;
            height: 70px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 5%;
            position: relative; 
            z-index: 1000;
            border-bottom: 3px solid var(--midnight-blue);
            box-shadow: none;
        }

        .logo {
            font-size: 24px;
            font-weight: 900;
            color: #cdd8e3;
            text-transform: uppercase;
        }

        .btn-volver {
            color: #cdd8e3;
            text-decoration: none;
            font-weight: bold;
            border: 3px solid #cdd8e3;
            padding: 3px 15px;
            border-radius: 8px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .btn-volver:hover {
            background-color: #cdd8e3;
            color: #2c3e50;
        }

        /* 3. CONTENEDOR Y TABLA */
        .container {
            max-width: 1100px;
            margin: 40px auto;
            padding: 0 20px;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            background: #cdd8e3;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        }

        th {
            background-color: var(--midnight-blue);
            color: var(--highway-yellow);
            padding: 15px;
            text-align: left;
        }

        td {
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
        }

        .pista-row:hover { background-color: #f9f9f9; cursor: pointer; }
        .pista-row.active { background-color: #fff9d6; font-weight: bold; }

        .btn-play { color: var(--midnight-blue); font-size: 1.2rem; }

        /* 4. REPRODUCTOR FIJO */
        .reproductor-fijo {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background-color: var(--midnight-blue);
            padding: 15px 5%;
            box-shadow: 0 -2px 10px rgba(0,0,0,0.3);
            display: flex;
            flex-direction: column;
            align-items: center;
            z-index: 2000;
        }

        #info-reproduccion {
            color: var(--highway-yellow); 
            margin-bottom: 10px;
            font-size: 14px;
            font-weight: bold;
            text-transform: uppercase;
            background-color: transparent; 
            padding: 2px 15px;
            display: flex;
            align-items: center;
            gap: 20px;
            min-height: 40px;
        }

        #info-reproduccion.playing {
            background-color: transparent;
        }

        #visualizador {
            width: 200px; 
            height: 40px;
            display: none;
        }

        .playing #visualizador {
            display: block;
        }

        .controles-extra {
            display: flex;
            align-items: center;
            gap: 20px;
            width: 100%;
            max-width: 800px;
        }

        audio {
            flex-grow: 1;
            height: 40px;
            filter: invert(17%) sepia(13%) saturate(2331%) hue-rotate(171deg) brightness(95%) contrast(92%);
        }

        .btn-shuffle {
            background: none;
            border: 2px solid var(--highway-yellow);
            color: var(--highway-yellow);
            padding: 8px 15px;
            border-radius: 20px;
            cursor: pointer;
            font-weight: bold;
            transition: 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .btn-shuffle.active {
            background-color: var(--highway-yellow);
            color: var(--midnight-blue);
        }

        footer {
            background-color: var(--midnight-blue);
            color: var(--bone-white);
            padding: 30px 5%;
            text-align: center;
        }