@import 'https://fonts.googleapis.com/css?family=Roboto';

html {
    box-sizing: border-box;
}
*, *:before, *:after {
    box-sizing: inherit;
}

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    background: #e1e7ed;
}

.header {
    background: #FFFFFF;
    padding: 18px 30px;
    box-shadow: 0 0 5px #888;
    height: 85px;
}

.btn {
    background: #53b6c2;
    padding: 15px 0px;
    width: 170px;
    height: 50px;
    border: 0;
    border-radius: 5px;
    color: #FFFFFF;
    text-transform: uppercase;
    font-size: 16px;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.controls {
    color: #b5bbbc;
    float: right;
    margin-top: 5px;
    font-size: 15px;
}
.controls__label {
    position: relative;
    top: -5px;
    margin-right: 30px;
    text-transform: uppercase;
}
.controls__count {
    font-size: 35px;
}
.controls__matched-count {
    color: #53b6c2;
}
.controls__total-count {

}

.main {
    padding: 30px 20px;
    max-width: 1240px;
    margin: 0 auto;
}

.card {
    position: relative;
    width: 130px;
    height: 200px;
    float: left;
    margin: 0 20px 20px 0;
    transform-style: preserve-3d;
    transition: transform 0.5s;
}
.card:hover {
    cursor: pointer;
}

.card__face {
    margin: 0;
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 5px;
}
.card__face--back {
    background: #58b9c2;
    border: 2px solid rgba(255, 255, 255, 0.5);
    background-position: 20px 20px;
    background-image: url(../img/card-background.png);
    background-size: 70%;
}
.card__face--front {
    background: #FFFFFF;
    background-repeat: no-repeat;
    background-position: center;
    background-size: 70%;
    transform: rotateY(180deg);
}

.card--diamond .card__face--front {
    background-image: url(../svg/diamond.svg);
}
.card--bulb .card__face--front {
    background-image: url(../svg/bulb.svg);
}
.card--umbrella .card__face--front {
    background-image: url(../svg/umbrella.svg);
}
.card--heart .card__face--front  {
    background-image: url(../svg/heart.svg);
}
.card--bell .card__face--front {
    background-image: url(../svg/bell.svg);
}
.card--key .card__face--front {
    background-image: url(../svg/key.svg);
}
.card--medal .card__face--front {
    background-image: url(../svg/medal.svg);
}
.card--present .card__face--front  {
    background-image: url(../svg/present.svg);
}

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

@media (max-width: 1300px) {
    .main {
        max-width: 1040px;
    }
    .card {
        margin: 0 10px 10px 0;
        width: 115px;
        height: 180px;
    }
}

@media (max-width: 1100px) {
    .main {
        max-width: 840px;
    }
    .card {
        margin: 0 10px 10px 0;
        width: 90px;
        height: 140px;
    }
}

@media (max-width: 850px) {
    .main {
        max-width: 700px;
    }
    .card {
        margin: 0 10px 10px 0;
        width: 155px;
        height: 240px;
    }
}

@media (max-width: 740px) {
    .main {
        max-width: 600px;
    }
    .card {
        margin: 0 10px 10px 0;
        width: 130px;
        height: 210px;
    }
}

@media (max-width: 640px) {
    .controls__label {
        display: none;
    }
    .main {
        width: auto;
    }
    .card {
        margin: 0 3% 10px 0;
        width: 30%;
        height: 200px;
    }
}

@media (max-width: 440px) {
    .card {
        height: 150px;
    }
}