@property --primary-color {
    syntax: '<color>';
    initial-value: white;
    inherits: false;
}

@property --secondary-color {
    syntax: '<color>';
    initial-value: white;
    inherits: false;
}

:root {
    --text-shadow: 0 0 12px rgba(0, 0, 0, 0.4);
    --box-shadow: 0 .5rem .75rem .375rem rgba(0, 0, 0, .15), 0 .25rem .25rem rgba(0, 0, 0, .3);
}

* {
    font-family: 'Exo 2', sans-serif;
    user-select: none;
}

html {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

body {
    padding: 2rem;
}

#root {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#root > * {
    width: 30rem;
}

#root > *:not(:first-child) {
    margin-top: 2rem;
}

#root > *.hidden {
    display: none;
}

#root > * > .title {
    margin-bottom: .5rem;
    color: white;
    text-shadow: var(--text-shadow);
    font-size: 1.5rem;
    font-weight: 600;
}

#music {
    display: flex;
    flex-direction: column;
    --progress: 100%;
}

#music > .progress-bar {
    position: relative;
    display: flex;
    align-items: center;
    margin-top: .5rem;
    padding: 1rem;
    width: 28rem;
    background-image: linear-gradient(225deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--box-shadow);
    border-radius: .5rem;
    overflow: hidden;
    transition:
            opacity .4s,
            --primary-color 1s,
            --secondary-color 1s;
    --progress-size: inherit;
    --progress-color: inherit;
}

#music > .progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    right: var(--progress-size);
    bottom: 0;
    left: 0;
    background-color: rgba(0, 0, 0, .3);
    transition:
            right 1s,
            background-color 4s;
}

#music > .progress-bar > .data {
    display: flex;
    flex-direction: column;
    margin-left: 1rem;
    overflow-x: hidden;
    z-index: 1;
}

#music > .progress-bar > .data > .title,
#music > .progress-bar > .data > .artists {
    color: white;
    white-space: nowrap;
    overflow-x: hidden;
    text-overflow: ellipsis;
}

#music > .progress-bar > .data > .title {
    font-size: 1.2rem;
    font-weight: 600;
}

#music > .progress-bar > .data > .artists {
    font-size: 1rem;
    font-weight: 400;
}

#music > .progress-bar > .cover {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    object-fit: cover;
    z-index: 1;
}