* {
    border: 0;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    color: black;
    font-family: Britannic;
}

:root {
    font-size: calc(16px + (20 - 16) * (100vw - 320px)/(1024 - 320));
}

body, button {
    color: #fff;
    font: 1em Muli, "Helvetica Neue", Helvetica, sans-serif;
    line-height: 1.5;
}

body {
    overflow: hidden;
}

button, canvas {
    -webkit-tap-highlight-color: transparent;
}

button, .difficulty-select, .tutorial {
    opacity: 0;
}

button {
    background: bisque;
    border-radius: 0.375em;
    box-shadow: 0 0 0 0.25em inset, 0 -0.5em 0 #0003 inset;
    cursor: pointer;
    display: block;
    font-weight: 700;
    margin: 0 auto 0.75em auto;
    padding: 0.75em 1.5em;
    transition: background 0.15s linear;
    transform: translateY(50%);
    width: 100%;
    max-width: 16em;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    color: black;
    font-family: Britannic;
    border-radius: 40px;
}

    button:hover {
        background: darksalmon;
    }

    button:active {
        background: #0c48db;
    }

    button:disabled {
        cursor: default;
    }

header, .difficulty-select, .tutorial, .replay {
    position: absolute;
    z-index: 1;
}

header, .difficulty-select {
    left: 0;
    width: 100%;
}

header, h1 {
    line-height: 1;
}

header {
    font-size: 4em;
    font-weight: 900;
    top: 0;
    padding: 0.75rem;
    -webkit-text-stroke: 4px #171717;
    text-shadow: 0 4px 0 #171717;
    transform: translateY(-100%);
    transition: all 0.25s linear;
}

h1 {
    font-size: 2em;
    margin-bottom: 1em;
    text-align: center;
    transform: translateX(100%);
}

kbd {
    background: white;
    border-radius: 1.25em;
    display: inline-block;
    font-family: Helvetica, sans-serif;
    height: 1.5em;
    min-width: 1.5em;
    padding: 0 0.25em;
    text-align: center;
    vertical-align: middle;
}

p {
    margin-bottom: 1.5em;
}

/* UI */
.difficulty-select, .tutorial, .replay {
    top: 50%;
}

.difficulty-select, .tutorial {
    background: #0000007f;
}

.difficulty-select {
    padding: 1.5em 0;
    transform: translateY(-50%);
}

.menu-active, .tutorial-active, .replay-active {
    z-index: 9;
}

.menu-active {
    animation: fadeIn 0.5s linear forwards;
}

    .menu-active h1 {
        animation: slideIn 0.5s 0.5s linear forwards;
        color: black;
        font-family:Britannic;
    }

    .menu-active button:nth-of-type(1) {
        animation: fadeSlide 0.15s 1s linear forwards;
    }

    .menu-active button:nth-of-type(2) {
        animation: fadeSlide 0.15s 1.15s linear forwards;
    }

    .menu-active button:nth-of-type(3) {
        animation: fadeSlide 0.15s 1.3s linear forwards;
    }

    .menu-active button:nth-of-type(4) {
        animation: fadeSlide 0.15s 1.45s linear forwards;
    }

.menu-inactive {
    animation: fadeIn 0.5s 1.1s linear reverse forwards;
    opacity: 1;
}

    .menu-inactive h1 {
        animation: slideOut 0.5s 0.6s linear forwards;
        transform: translateX(0);
    }

    .menu-inactive button {
        opacity: 1;
        transform: translateY(0);
    }

        .menu-inactive button:nth-of-type(1) {
            animation: fadeSlide 0.15s linear reverse forwards;
        }

        .menu-inactive button:nth-of-type(2) {
            animation: fadeSlide 0.15s 0.15s linear reverse forwards;
        }

        .menu-inactive button:nth-of-type(3) {
            animation: fadeSlide 0.15s 0.3s linear reverse forwards;
        }

        .menu-inactive button:nth-of-type(4) {
            animation: fadeSlide 0.15s 0.45s linear reverse forwards;
        }

.tutorial {
    border-radius: 0.75em;
    padding: 1.5em 1.5em 0 1.5em;
    left: 50%;
    text-align: center;
    width: 12em;
    transform: translate(-50%,-50%);
    transition: opacity 0.25s linear;
}

.replay {
    margin: 0;
    padding: 1.5em;
    left: 50%;
    transform: translate(-50%,0);
    transition: all 0.15s linear;
    width: 6em;
    height: 6em;
}

.btn-icon {
    fill: black;
    width: 3em;
    height: 3em;
}

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

.tutorial-active, .replay-active {
    opacity: 1;
    background:coral;
}

.replay-active {
    transform: translate(-50%,-50%);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0
    }

    to {
        opacity: 1
    }
}

@keyframes slideIn {
    from {
        transform: translateX(100%)
    }

    to {
        transform: translateX(0)
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0)
    }

    to {
        transform: translateX(-100%)
    }
}
.rightbtn {
    position: absolute;
    display: block;
    z-index: 89;
    padding: 66px;
    margin: 82px;
}

@keyframes fadeSlide {
    from {
        opacity: 0;
        transform: translateY(50%);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}