@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;200;300;400;500;600;700&display=swap');

html, body {
    height: 100%; /* Đảm bảo toàn bộ chiều cao màn hình */
    margin: 0;
    padding: 0;
}

* {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
    border: none;
    text-decoration: none;
    text-transform: uppercase;
}

.container {
    min-height: 100%; /* Đảm bảo căn giữa dựa trên chiều cao cha (body) */
    display: flex;
    align-items: center;
    justify-content: center;
    flex-flow: column;
    padding-bottom: 60px;
}

.container form {
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 10px 15px rgba(0,0,0,.1);
    padding: 20px;
    width: 600px;
    padding-top: 160px;
}

.container form .inputBox {
    margin-top: 20px;
}

.container form .inputBox span {
    display: block;
    color: #999;
    padding-bottom: 5px;
}

.container form .inputBox input,
.container form .inputBox select {
    width: 100%;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid rgba(0,0,0,.3);
    color: #444;
}

.container form .flexbox {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

.container form .flexbox .inputBox {
    flex: 1 1 150px;
}

.container form .submit-btn {
    width: 100%;
    background: linear-gradient(45deg, #705bdb, #ff7dbe);
    margin-top: 20px;
    padding: 10px;
    font-size: 20px;
    color: #fff;
    border-radius: 10px;
    cursor: pointer;
    transition: .2s linear;
}

.container form .submit-btn:hover {
    letter-spacing: 2px;
    opacity: .8;
}

.container .card-container {
    margin-bottom: -150px;
    position: relative;
    height: 250px;
    width: 400px;
}

.container .card-container .front {
    position: absolute;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    background: linear-gradient(45deg, #705bdb, #ff7dbe);
    border-radius: 5px;
    backface-visibility: hidden;
    box-shadow: 0 15px 25px rgba(0,0,0,.2);
    padding: 20px;
    transform: perspective(1000px) rotateY(0deg);
    transition: transform .4s ease-out;
}

.container .card-container .front .image {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 10px;
}

.container .card-container .front .image img {
    height: 50px;
}

.container .card-container .front .card-number-box {
    padding: 30px 0;
    font-size: 22px;
    color: #fff;
}

.container .card-container .front .flexbox {
    display: flex;
}

.container .card-container .front .flexbox .box:nth-child(1) {
    margin-right: auto;
}

.container .card-container .front .flexbox .box {
    font-size: 15px;
    color: #fff;
}

.container .card-container .back {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: linear-gradient(45deg, #705bdb, #ff7dbe);
    border-radius: 5px;
    padding: 20px 0;
    text-align: right;
    backface-visibility: hidden;
    box-shadow: 0 15px 25px rgba(0,0,0,.2);
    transform: perspective(1000px) rotateY(180deg);
    transition: transform .4s ease-out;
}

.container .card-container .back .stripe {
    background: #000;
    width: 100%;
    margin: 10px 0;
    height: 50px;
}

.container .card-container .back .box {
    padding: 0 20px;
}

.container .card-container .back .box span {
    color: #fff;
    font-size: 15px;
}

.container .card-container .back .box .cvv-box {
    height: 50px;
    padding: 10px;
    margin-top: 5px;
    color: #333;
    background: #fff;
    border-radius: 5px;
    width: 100%;
}

.container .card-container .back .box img {
    margin-top: 30px;
    height: 30px;
}

.money-input-wrapper {
    position: relative;
}

.money-donate-input {
    width: 100%;
    padding: 10px 50px 10px 10px;
    border-radius: 10px;
    border: 1px solid rgba(0,0,0,.3);
    color: #444;
    font-size: 16px;
}

.vnd-label {
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    color: #666;
    font-weight: bold;
    pointer-events: none;
    font-size: 14px;
}

/* Thêm kiểu dáng cho container lật */
.flip-container {
    perspective: 1000px;
    width: 600px;
    height: 800px;
    margin: 0 auto; /* Căn giữa chiều ngang */
}

.flipper {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.front-container,
.back-container {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}
 

.front-container {
    transform: rotateY(0deg);
}

.back-container {
    transform: rotateY(180deg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 10px 15px rgba(0,0,0,.1);
}

.qr-image img {
    max-width: 500px;
    max-height: 500px;
}

.qr-code {
    text-align: center;
    margin-top: 20px;
}

.qr-link,
.back-link {
    color: #705bdb;
    cursor: pointer;
    margin-left: 5px;
    text-transform: none;
    font-size: 16px;
}

.qr-link:hover,
.back-link:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
        align-items: center;
    }

    .content {
        width: 100%;
        margin-right: 0;
        position: relative !important;
    }

    .card-container {
        width: 110% !important;
        height: auto;
        margin-bottom: 30px;
    }

    .container form {
        width: 100%;
        padding: 15px;
    }

    .container form {
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 10px 15px rgba(0,0,0,.1);
    padding-top: 160px;
    }

    .flip-container {
        width: 100%;
        height: auto;
    }

    .qr-image img {
        max-width: 100%;
        height: auto;
    }

    .qr-code {
    text-align: center;
    margin-top: 765px !important;
    }

    .container form .flexbox{
    align-items: flex-end;
    }

    .container form .flexbox {
        align-items: flex-end;
    }
}