/* GENERAL */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Roboto', sans-serif;
    flex-direction: column;
    justify-content: space-between;
    min-height: 100vh;
}

button {
    padding: 10px;
    color: inherit;
    background: inherit;
}

button,
button:focus,
a,
input,
label {
    cursor: pointer;
    outline: 0;
}


/* UTILITIES */
.container {
    padding: 10px;
    max-width: 90%;
    width: 1000px;
}

.display-none {
    display: none;
}

.inline-fl-w {
    display: inline-flex;
    flex-wrap: wrap;
}

.flex-w {
    display: flex;
    flex-wrap: wrap;
}

.flex-nw {
    display: flex;
}

.text-small {
    font-size: 70%;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.central {
    margin: auto;
}

.absolute {
    position: absolute;
}

.relative {
    position: relative;
}

.in-block {
    display: inline-block;
}

.black {
    background: #000;
}

.green {
    background: darkgreen;
}

.darkred {
    background: darkred;
}

.darkred-color {
    color: darkred;
}

.darkgreen-color{
    color: darkgreen;
}

.white-color {
    color: #fff
}


/* HEADER */
.header .container {
    justify-content: space-between;
    align-items: center;
}

    header .left-header,
    header .right-header {
        flex-basis: 50%;
    }

    header .center-header {
        flex-basis: 100%;
    }

        .link-github {
            margin-left: 15px;
            background: inherit;
            color: inherit;
            font-size: 250%;
        }

        .play-button {
            font-size: 150%;
        }

        .right-header {
            justify-content: flex-end;
            align-items: center;
        }

            #volume-button,
            #volume-button:focus {
                width: 50px;
                padding: 0;
                background: inherit;
                color: inherit;
                border: 0;
                outline: 0;
            }

                #volume-button > * {
                    display: block;
                }

                #icon-volume {
                    padding: 5px;
                    font-size: 200%;
                }

                #icon-switch {
                    font-size: 200%;
                }

            .input-box {
                margin-right: 15px;
            }


/* MAIN */
main {
    padding-top: 25px;
    flex-grow: 1;
}

.info-section,
    .board-section {
        flex-basis: 100%
    }


/* Main: INFO-SECTION */
.output {
    padding-top: 25px;
    justify-content: center;
}

    .output .wrapper {
        margin: 15px;
    }

        .wr-label {
            margin-bottom: 10px;
            font-size: 120%;
        }

        .box {
            justify-content: center;
            align-items: center;
            height: 60px;
            width: 60px;
            border: 1px solid #fff;
            font-size: 200%;
            font-weight: 800;
        }

    .text-box {
        font-size: 120%;
    }


/* Main: BOARD-SECTION */
.board-section {
    flex-basis: 65%;
}
    #board {
        display: none;
    }

    .board_size1,
    .board_size2,
    .board_size3{
        width: 402px;
    }

        .scene {
            perspective: 600px;
        }  

        .scene_size1 {
            width: 100px;
            height: 100px;
        }
        .scene_size2,
        .scene_size3,
        .scene_size4 {
            width: 50px;
            height: 50px;
        }
            .card {
                width: 100%;
                height: 100%;
                transition: transform 1s;
                transform-style: preserve-3d;
                cursor: pointer;
                position: relative;
                border: 1px solid lightgray;
            }

                .card-face{
                    display: flex;
                    justify-content: center;
                    align-items: center;
                    width: 100%;
                    height: 100%;
                    color: white;
                    text-align: center;
                    font-weight: bold;
                    -webkit-backface-visibility: hidden;
                    backface-visibility: hidden;
                }

                .card.flipped {
                    transform: rotateY(180deg);
                }

                .card-up {
                    background: green;
                    transform: rotateY(180deg);
                }

                .card-down {
                    font-size: 120%;
                    background: darkred;
                }

                .card-down:hover {
                    background: rgba(139, 0, 0, 0.8);
                }


        .layer::after {
            position: absolute;
            content: '';
            left: 0%;
            top: 0%;
            width: 100%;
            height: 100%;
            z-index: 1;
        }


/* FOOTER  */
.main-footer {
    justify-content: space-between;
}

    .main-footer .info-button {
        padding: 0;
        font-size: 120%;
        border: 0;
    }

    footer .footer-right {
        font-style: italic;
        font-size: 50%;
    }

footer .rules {
    top: 0px;
    left: 10px;
    transform: translate(0%, -100%);
    padding: 10px;
    width: 800px;
    max-width: 90%;
    background: gray;
    border: 1px solid #fff;
    font-size: 90%;
}

    footer .rules > p {
        margin-bottom: 15px;
    }



@media screen and (max-width: 540px) {
        /* GENERAL */
        body {
            font-size: 12px;
        }

        /* UTILITIES */
        .container {
            max-width: 95%;
        }


        /* HEADER */
        .header .container > * {
            flex-basis: 100%;
            justify-content: center;
        }

        .right-header {
            margin-top: 10px;
            margin-bottom: 10px;
        }

            .input-box-inner {
                display: inline-block;
                margin: 5px;
            }     

            #volume-button {
                display: none;
            }

        /* MAIN */
        main .container {
            min-width: 100%;
            margin-right: 0;
            margin-left: 0;
            padding-right: 0;
            padding-left: 0;
        }

            /* Main: BOARD */
            .board_size1,
            .board_size2,
            .board_size3 {
                width: 320px !important;
                font-size: 120%;
            }
        
                .scene_size1 {
                    width: 79.5px !important;
                    height: 79.5px !important;
                }

                .scene_size2,
                .scene_size3,
                .scene_size4 {
                    width: 39.75px !important;
                    height: 39.75px !important;
                }
}


@media screen and (min-width: 720px) {
    /* HEADER */
    .header .container > * {
        flex-basis: calc(100% / 3)
    }

        header .right-header {
            order: 1;
        }

        
    /* Main: BOARD-SECTION */
    .board_size1 {
        width: 402px;
    }

    .board_size2 {
        width: 602px;
    }

    .board_size3 {
        width: 524px;
    }

        .scene_size1 {
            width: 100px;
            height: 100px;
            font-size: 200%;
        }

        .scene_size2 {
            width: 75px;
            height: 75px;
            font-size: 150%;
        }

        .scene_size3 {
            width: 65px;
            height: 65px;
            font-size: 120%;
        }

        .scene_size4 {
            width: 50px;
            height: 50px;
        }

}

@media screen and (min-width: 960px) {
    .info-section {
        text-align: left;
        flex-basis: 35%;
        order: -1;
    }

    .output {
        justify-content: flex-start;
    }

    .output .wrapper {
        margin: 20px 20px 40px 0;
    }
}


@media screen and (max-height: 590px) and (min-width: 960px) {
    footer .container {
        padding-top: 0;
        padding-bottom: 0;
    }
}