/* Khung video YouTube tải khi bấm (xem inc/perf.php mục 12). Tỉ lệ 16:9, nút phát đỏ thương hiệu. */
.bla-yt { position: relative; width: 100%; max-width: 100%; aspect-ratio: 16 / 9; background: #1d0e1f; border-radius: 10px; overflow: hidden; margin: 1em 0; }
.bla-yt__btn { position: absolute; inset: 0; width: 100%; height: 100%; padding: 0; border: 0; background: none; cursor: pointer; }
.bla-yt__btn img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bla-yt__play { position: absolute; left: 50%; top: 50%; width: 68px; height: 68px; margin: -34px 0 0 -34px; border-radius: 50%; background: #c4121a; box-shadow: 0 4px 14px rgba(0, 0, 0, .35); transition: transform .15s; }
.bla-yt__play::before { content: ""; position: absolute; left: 27px; top: 20px; border-style: solid; border-width: 14px 0 14px 22px; border-color: transparent transparent transparent #fff; }
.bla-yt__btn:hover .bla-yt__play, .bla-yt__btn:focus-visible .bla-yt__play { transform: scale(1.08); }
.bla-yt__btn:focus-visible { outline: 3px solid #ffc50f; outline-offset: -3px; }
.bla-yt iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }