/* --- Popup wrapper --- */
#popup-wrapper {
    display: none;
    position: fixed;
    top:0; left:0; right:0; bottom:0;
    background: rgba(0,0,0,0.5);
    z-index: 9999;
    justify-content: center;
    align-items: center;
}

.loading--item {
    z-index: 999999 !important; 
}

#formSuccess {
    z-index: 999999 !important;
}

/* --- Popup content --- */
.popup-content {
    position: relative;
    background: url('https://cdn.diemnhangroup.com/seoulacademy/2025/09/trung-thu-ruoc-uu-dai-hoc-nghe-vung-tuong-lai-POPUP.webp') no-repeat center/cover;
    padding: 30px;
    width: 450px;
    height: 650px;
    border-radius: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: flex-end; 
}

/* --- Close button --- */
.close-popup {
    position: absolute;
    top: 10px;
    right: 10px;
    background: red;
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 30px; height: 30px;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
}

/* --- Bánh container --- */
.banh-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 60%;
}

/* --- Mỗi bánh --- */
.banh {
    width: calc(33.33% - 10px);
    max-width: 150px;
    aspect-ratio: 1/1; /* giữ hình vuông */
    perspective: 1000px;
    cursor: pointer;
    display: flex;
}

/* --- Flip inner --- */
.flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    border-radius: 10px;
}

/* --- Lật khi flipped --- */
.banh.flipped .flip-inner {
    transform: rotateY(180deg);
}

/* --- Mặt trước và mặt sau --- */
.flip-front, .flip-back {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 10px;
    backface-visibility: hidden;
}

.flip-front img, .flip-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

/* --- Mặt sau đảo 180deg --- */
.flip-back {
    transform: rotateY(180deg);
}

/* --- Nút nhận thưởng --- */
#nhan-thuong {
    display: inline-block;
    padding: 10px 20px;
    background: grey;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    pointer-events: none;
    margin-top: 40px;
}

#nhan-thuong.active {
    background: #ff9800;
    pointer-events: auto;
}

#form-thong-tin {
    position: relative;
}

#xac-nhan {
    margin: 50px 0;
}

#form-thong-tin {
    display: none;
    margin-top: 10px;
}

#form-thong-tin input {
    border-radius: 8px;
    border: 1px solid #fff;
    background: transparent;
    display: block;
    margin: 20px 0;
    width: 100%;
    padding: 10px;
}

#form-thong-tin input::placeholder {
    color: #fff !important;
}

#form-message {
    color: red;
    margin-top: 5px;
}

#xac-nhan {
    padding: 10px 20px;
    margin-top: 15px;
    color: #fff;
    background: rgb(255 194 43 / var(--tw-border-opacity, 1));
    border-radius: 4px;
}

#nhan-thuong.active:hover {
    color: #fff !important;
    background: #122257 !important;
}

#xac-nhan:hover {
    color: #fff !important;
    background: #122257 !important;
}