:root {
    --color-primary: #EFEEEE;
    --player-color: #FFFFFF80;
    --black: #6D6D6D;
    --dark-grey: #7E7D7D;
    --grey: #6D6D6D;
    --light-grey: #ABABAB;
    --blue: #0B5EB724;
    --dark-blue: #1767D764;

    --inner-shadow: inset 5px 5px 7px #FFFFFF70;
    --blue-shadow: 5vw 2vw 10vw var(--blue), -1vw -1vw 6vw var(--blue);
    --shadow: -9px -9px 20px #F6F4F5D0, 7px 7px 24px var(--grey);
    --inset-shadow: inset 2px 2px 5px var(--light-grey), inset -3px -3px 10px #FFF;
    --button-active-shadow: inset 4px 4px 20px var(--dark-blue);
}

* {
    margin: 0;
    padding: 0;

    font-family: 'Pangolin', cursive;
    color: var(--grey);
}

body {
    height: 100vh;
    background-color: var(--color-primary);
}

h1 {
    margin-top: 3%;
    text-align: center;

    letter-spacing: 0.1em;
    font-size: xx-large;
}

.player {
    width: 450px;
    height: 620px;
    margin: 3.5% auto 0;

    background-color: var(--player-color);
    border-radius: 20px;
    box-shadow: var(--blue-shadow), var(--inner-shadow);

    display: grid;
    grid-template-rows: 8fr 2fr 3fr;
}

.img {
    grid-row: 1;
    width: 250px;
    height: 250px;

    border-radius: 10px;
    box-shadow: var(--shadow);

    border-radius: 10px;
    margin: 3.5rem auto 0;
}

.slider {
    grid-row: 2;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    position: relative;
    justify-content: center;
}

.slider input[type=range] {
    -webkit-appearance: none;
         -moz-appearance: none;
              appearance: none;
    width: 70%;
    height: 10%;
    background: var(--grey);
    box-shadow: var(--inset-shadow);
    border-radius: 1vw;
}

.slider input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
            appearance: none;
    width: 2vw;
    height: 2vw;
    border-radius: 50%;
    background: radial-gradient(circle,  var(--color-primary) 0, var(--color-primary) 4px, var(--black) 4px, 
                                            var(--black) 8px, var(--black) 8px, var(--black));
    box-shadow: inset 0 2px 1px var(--grey), inset 1px 0 1px var(--player-color), 
                inset -1px 0 1px var(--player-color), inset 0 -1px 1px #00000080, 
                3px 3px 5px #00000066;
    background-clip: border-box;
}

.slider label {
    position: absolute;
    width: 15%;
    height: 20%;
    top: 1%;
    font-size: 1vw;
}

.slider .passed {
    left: 3rem;
}

.slider .duration {
    right: 1.55rem;
}

#panel {
    margin-top: 1rem;
    grid-row: 3;
    text-align: center;
}

button {
    width: 70px;
    height: 70px;
    margin: 0 1.3rem;
    background-position: center;
    background-repeat: no-repeat;
    background-size: 40%, auto;

    border: solid 4px var(--color-primary);
    border-radius: 50%;
    box-shadow: var(--shadow);

    cursor: pointer;
    background-color: inherit;
}

button:active { 
    border: solid 4px var(--dark-blue);
    background-color: var(--dark-blue);
    box-shadow: var(--shadow), var(--button-active-shadow);
}

.play_pause {
    background-image: url("../images/play.svg");
}

.play_pause:active {
    background-image: url("../images/pause.svg");
}

.next {
    background-image: url("../images/next.svg");
}

.next:active {
    background-image: url("../images/next-active.svg");
}

.prev {
    background-image: url("../images/prev.svg");
}

.prev:active {
    background-image: url("../images/prev-active.svg");
}

.play_pause.pressed {
    border: solid 4px var(--dark-blue);
    background-color: var(--dark-blue);
    box-shadow: var(--shadow), var(--button-active-shadow);
    background-image: url("../images/pause.svg");
}