/* 顶部通栏广告容器 */
.top-banner {
	position: relative;
	width: 100%;
	height: 80px;
	overflow: hidden;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
	background: linear-gradient(45deg, #3498db, #2c3e50);
}

/* 轮播容器相对定位，给按钮提供定位基准 */
.banner-container {
	position: relative;
	height: 100%;
	overflow: hidden;
}


.banner-item {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	opacity: 0;
	pointer-events: none;
	/* 替代visibility：不可点击，防止透明层遮挡点击 */
	transition: opacity 0.4s ease;
	z-index: 1;
}

.banner-item.active {
	opacity: 1;
	pointer-events: auto;
	z-index: 2;
}

.banner-img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.img-loader {
	position: absolute;
	top: 50%;
	left: 50%;
	width: 24px;
	height: 24px;
	border: 2px solid #ffffff66;
	border-top-color: #fff;
	border-radius: 50%;
	animation: spin 1s linear infinite;
	transform: translate(-50%, -50%);
	z-index: 10;
}

@keyframes spin {
	0% {
		transform: translate(-50%, -50%) rotate(0deg);
	}

	100% {
		transform: translate(-50%, -50%) rotate(360deg);
	}
}

.refresh-counter {
	position: absolute;
	top: 10px;
	right: 10px;
	z-index: 5;
	padding: 3px 8px;
}

.refresh-counter {
	position: absolute;
	right: 10px;
	bottom: 10px;
	z-index: 5;
}

/* 切换按钮基础样式 */
.banner-btn {
	position: absolute;
	top: 50%;
	transform: translateY(-50%);
	width: 40px;
	height: 40px;
	border-radius: 50%;
	border: none;
	background: rgba(0, 0, 0, 0.4);
	color: #fff;
	font-size: 18px;
	cursor: pointer;
	z-index: 99;
	/* 默认隐藏 */
	opacity: 0;
	visibility: hidden;
	transition: all 0.3s ease;
}

.banner-btn:hover {
	background: rgba(0, 0, 0, 0.7);
}

.prev-btn {
	left: 15px;
}

.next-btn {
	right: 15px;
}

/* 鼠标悬浮容器时显示按钮 */
.banner-container:hover .banner-btn {
	opacity: 1;
	visibility: visible;
}