/* --- Ảnh thumbnail video giả --- */
.fake-youtube-video {
    position: relative;
    cursor: pointer;
    overflow: hidden;
    border-radius: 8px;
    padding-bottom: 56.25%; /* Tỷ lệ 16:9 */
    height: 0;
    background: #000;
}
.fake-youtube-video img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    transition: 0.3s;
}
.fake-youtube-video:hover img {
    opacity: 1;
}
/* Icon Play đè lên trên */
.fake-youtube-video .play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #f00;
    text-align: center;
    transition: 0.3s;
    font-size: 50px;
}
.fake-youtube-video:hover .play-icon {
    opacity: 0.6;
}

/* --- Khung Popup Modal --- */
.yt-modal-overlay {
    display: none; /* Ẩn mặc định */
    position: fixed;
    z-index: 99999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85); /* Nền đen mờ */
}

.yt-modal-content {
    width: 90%;
    max-width: 900px; /* Độ rộng tối đa của popup */
    background: #000;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    margin: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%)
}

.yt-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: #fff;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
}

/* Ép khung iframe bên trong modal luôn theo tỷ lệ 16:9 */
.yt-iframe-wrapper {
    position: relative;
    padding-bottom: 56.25%; 
    height: 0;
    overflow: hidden;
}
.yt-iframe-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
@media(max-width: 767px){
    .fake-youtube-video .play-icon{font-size: 40px;}
}