@import url('https://fonts.googleapis.com/css2?family=Dancing+Script&display=swap');

* {
    margin: 0px;
    padding: 0px;
}

body {
    font-family: 'Exo', sans-serif;
}


.context {
    width: 100%;
    position: absolute;
    top: 50vh;
}

.context h1 {
    text-align: center;
    color: #fff;
    font-size: 50px;
}


.area {
    background: #e351d2;
    position: relative;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    animation: 10s changeBgr;
    animation-iteration-count: infinite;
}

@keyframes changeBgr {
    0% {
        background-color: #e351d2;
    }

    25% {
        background-color: rgb(191, 150, 218);
    }

    50% {
        background-color: rgb(131, 186, 208);
    }

    100% {
        background-color: #e351d2;
    }
}

.circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.circles li {
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 25s linear infinite;
    bottom: -150px;

}

.circles li:nth-child(1) {
    left: 25%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles li:nth-child(3) {
    left: 70%;
    width: 20px;
    height: 20px;
    animation-delay: 4s;
}

.circles li:nth-child(4) {
    left: 40%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 18s;
}

.circles li:nth-child(5) {
    left: 65%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles li:nth-child(6) {
    left: 75%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles li:nth-child(7) {
    left: 35%;
    width: 150px;
    height: 150px;
    animation-delay: 7s;
}

.circles li:nth-child(8) {
    left: 50%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles li:nth-child(9) {
    left: 20%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles li:nth-child(10) {
    left: 85%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}



@keyframes animate {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }

    100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }

}

/* mail */
.mail {
    position: absolute;
    display: flex;
}

#heart {
    display: flex;
    background-image: url("./assets/img/heart.png");
    background-size: contain;
    background-repeat: no-repeat;
    width: 12rem;
    height: 10rem;
    position: absolute;
    top: 6rem;
    left: 1rem;
    z-index: 3;
    animation: 5.2s heartBackFromBottom;
}

#mini_hearts {
    background-image: url("./assets/img/mini_hearts.png");
    background-size: contain;
    background-repeat: no-repeat;
    width: 7rem;
    height: 9rem;
    position: absolute;
    right: 6rem;
    bottom: 4rem;
    z-index: 3;
    animation: 5.2s miniHeartsBackFromBottom ease;
}

#container {
    margin: auto;
    display: flex;
    width: 40rem;
    height: 35rem;
    position: relative;
}

#text_box {
    background-image: url("./assets/img/text_box.png");
    width: 100%;
    height: 100%;
    position: absolute;
    background-size: contain;
    background-repeat: no-repeat;
    z-index: 0;
    animation: 5s backFromBottom;
}

#text_cloud {
    margin: 23% auto auto auto;
    background-image: url("./assets/img/text_cloud.png");
    background-size: contain;
    background-repeat: no-repeat;
    width: 35rem;
    height: 13rem;
    z-index: 2;
    position: relative;
    animation: 5.5s backFromBottom ease;
}


@keyframes backFromBottom {
    from {
        opacity: 0;
        bottom: -100%;
    }

    to {
        opacity: 1;
        bottom: 0%;
    }
}

@keyframes miniHeartsBackFromBottom {
    from {
        opacity: 0;
        bottom: -100%;
    }

    to {
        opacity: 1;
        bottom: 4rem;
    }
}

@keyframes heartBackFromBottom {
    from {
        opacity: 0;
        top: 100%;
    }

    to {
        opacity: 1;
        top: 6rem;
    }
}

/*Tablet nhỏ(480 x 640)*/
@media screen and (max-width: 480px){
    #container {
        width: 24rem;
        height: 21rem;
    }

    #heart {
        width: 6rem;
        height: 6rem;
        top: 4rem;
        left: 0rem;
    }

    #mini_hearts {
        width: 5rem;
        height: 6rem;
        right: 3rem;
        bottom: 2rem;
    }

    @keyframes heartBackFromBottom {
        from {
            opacity: 0;
            top: 200%;
        }
    
        to {
            opacity: 1;
            top: 4rem;
        }
    }

    @keyframes miniHeartsBackFromBottom {
        from {
            opacity: 0;
            bottom: -100%;
        }
    
        to {
            opacity: 1;
            bottom: 2rem;
        }
    }
}

/*Iphone(480 x 640)*/
@media screen and (max-width: 340px){
    #container {
        width: 20rem;
        height: 17rem;
    }

    #heart {
        width: 5rem;
        height: 5rem;
        top: 4rem;
        left: 0rem;
    }

    #mini_hearts {
        width: 4rem;
        height: 4rem;
        right: 3rem;
        bottom: 2rem;
    }

    @keyframes heartBackFromBottom {
        from {
            opacity: 0;
            top: 200%;
        }
    
        to {
            opacity: 1;
            top: 4rem;
        }
    }

    @keyframes miniHeartsBackFromBottom {
        from {
            opacity: 0;
            bottom: -100%;
        }
    
        to {
            opacity: 1;
            bottom: 2rem;
        }
    }
}

.afterword {
    position: fixed;
    bottom: 1rem;
    left: 1rem;
    font-size: 17px;
    color: #fff;
    opacity: .5;
    animation: 20s showText;
    font-family: 'Dancing Script', cursive;
}

@keyframes showText {
    from {
        opacity: 0;
    } to {
        opacity: ease-in;
    }
}