* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}

html,
body,
main,
footer {
    position: relative;
    font-size: 16px;
}

h1 {
    font-size: 6rem;
}

main {
    min-height: 100vh;
    padding: 6rem;
}

footer {
    position: absolute;
    text-align: center;
    color: rgb(45, 45, 45);
    padding: 1rem;
    width: 100%;
    bottom: 0;
}

/* Music */
.lyrics {
    font-size: 18px;
    font-weight: bold;
    min-height: 11rem;
    padding: 2rem;
}

.word {
    font-size: 3rem;
    margin-right: 0.5rem;
}

.loading {
    font-size: 2rem;
    padding: 0 0.5rem;
}

/* Custom Fonts */
.f-c {
    font-family: 'Balsamiq Sans', cursive;
}

.f-u {
    font-family: 'Ubuntu', sans-serif;
}

/* Color Scheme */
.bg-p {
    background-color: rgb(245, 245, 245);
}

.h-l {
    background-color: rgb(255, 225, 25);
}

/* Underline */
.u-g {
    background-image: linear-gradient(90deg, rgb(30, 105, 210), rgb(200, 40, 240));
    display: block;
    border-radius: 1rem;
    height: 1rem;
    width: 100%;
}

/* Button */
.btn {
    display: inline-block;
    text-decoration: none;
    color: rgb(245, 245, 245);
    font-size: 2rem;
    border-radius: 2rem;
    padding: 0.75rem 1.25rem;
}

.btn-primary {
    background-color: rgb(30, 105, 210);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: rgb(25, 90, 180);
}

/* Display */
.hidden {
    display: none;
}

.d-b {
    display: block;
}

.d-i {
    display: inline-block;
}

.d-f-r {
    display: flex;
    position: relative;
    flex-flow: row;
    flex-wrap: wrap;
}

.d-f-c {
    display: flex;
    position: relative;
    flex-flow: column;
    flex-wrap: wrap;
}

/* Flex */
.f-a-c-c {
    justify-content: center;
    align-items: center;
}

.f-a-c-b {
    justify-content: center;
    align-items: flex-end;
}

.fl-1 {
    flex: 1;
}

.fl-2 {
    flex: 2;
}

/* Position */
.p-a {
    position: absolute;
}

.p-r {
    position: relative;
}

/* Sizing */
.h-100 {
    height: 100%;
}

.mh-30 {
    min-height: 30vh;
}

.w-100 {
    width: 100%;
}

/* Margin */
.m-l-1 {
    margin-left: 1rem;
}

.m-l-2 {
    margin-left: 2rem;
}

.m-l-3 {
    margin-left: 3rem;
}

.m-r-1 {
    margin-right: 1rem;
}

.m-r-2 {
    margin-right: 2rem;
}

.m-b-1 {
    margin-bottom: 1rem;
}

.m-b-2 {
    margin-bottom: 2rem;
}

.m-b-3 {
    margin-bottom: 3rem;
}

.m-b-4 {
    margin-bottom: 4rem;
}

/* Padding */
.p-l-1 {
    padding-left: 1rem;
}

.p-l-2 {
    padding-left: 2rem;
}

/* Images */
.i-h {
    max-width: 12rem;
    width: 20%;
}

.i-h img {
    cursor: pointer;
}

.i-h img:hover,
.i-h img:focus {
    animation: highlightButton 500ms infinite;
}

/* Highlight Animation */
@keyframes highlightButton {
    0% {
        outline: 5px solid rgb(200, 40, 240);
        outline-offset: 0.5rem;
    }

    50% {
        outline: 5px solid rgb(30, 105, 210);
        outline-offset: 1rem;
    }

    100% {
        outline: 5px solid rgb(200, 40, 240);
        outline-offset: 0.5rem;
    }
}

/* Animations */
.t-350 {
    transition: 350ms ease;
}

.t-500 {
    transition: 500ms ease;
}

.t-750 {
    transition: 750ms ease;
}

.t-1000 {
    transition: 1000ms ease;
}

.a-h {
    margin-left: 6rem;
}

/* Media Queries */
@media only screen and (max-width: 1666px) {
    h1 {
        font-size: 5rem;
    }
    
    .word {
        font-size: 2.5rem;
    }

    .m-l {
        margin-left: 0;
    }
}

@media only screen and (max-width: 1366px) {

    html,
    body {
        font-size: 12px;
    }

    main {
        padding: 4rem 6rem;
    }

    .m-t-1 {
        margin-top: 1rem;
    }

    .m-l {
        margin-left: 0;
    }

    .lyrics {
        min-height: 4rem;
        padding: 0;
    }

    .d-f-r.w-100.p-r {
        display: block;
    }
}

@media only screen and (max-width: 768px) {
    main {
        padding: 2rem;
    }

    h1 {
        font-size: 4.5rem;
    }

    .word {
        font-size: 2.25rem;
    }
}

/* Audio Visualizer */
.audio-visualizer {
    margin: 2rem 0;
}