/**
 * includes/banner_side.php - แบนเนอร์ fixed ซ้าย/ขวา
 * อยู่กึ่งกลางแนวตั้ง ติดซ้าย/ขวาหน้าจอ
 */
.banner-fixed-side {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 250px;
    z-index: 50;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}
.banner-fixed-side.is-closed {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-50%) scale(0.98);
}
.banner-fixed-left {
    left: 0;
}
.banner-fixed-right {
    right: 0;
}
.banner-fixed-side .banner-side-close {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    z-index: 2;
    transition: background 0.2s ease, color 0.2s ease;
}
.banner-fixed-side .banner-side-close:hover {
    background: rgba(200, 60, 60, 0.9);
    color: #fff;
}
.banner-fixed-left .banner-side-close { right: 8px; left: auto; }
.banner-fixed-right .banner-side-close { left: 8px; right: auto; }
.banner-fixed-side {
    padding-top: 44px;
}
.banner-fixed-side a {
    display: block;
    padding: 0 12px;
    width: 100%;
    box-sizing: border-box;
}
.banner-fixed-side img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}