.sba {
	position: fixed;
	left: 0;
	right: 0;
	bottom: 0;
	width: 100%;
	box-sizing: border-box;
	z-index: 9999;
	transform: translateY(100%);
	opacity: 0;
	transition: transform .4s ease, opacity .4s ease;
}

.sba.is-visible {
	transform: translateY(0);
	opacity: 1;
}

.sba__inner {
	position: relative;
	margin: 0 auto;
	background: #ffffff;
	border-top: 1px solid rgba(0,0,0,.1);
	box-shadow: 0 -6px 20px rgba(0,0,0,.08);
}

.sba__close {
	position: absolute;
	left: 50%;
	bottom: calc(100% - 1px); /* エリアに密着（境界線を1px重ねる） */
	transform: translateX(-50%);
	appearance: none;
	border: none;
	background: #ff3b30; /* 強調表示 */
	color: #fff;
	min-width: 72px;
	height: 34px;
	padding: 0 14px;
	border-radius: 16px 16px 0 0; /* タブ形状 */
	cursor: pointer;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	line-height: 1;
	text-align: center;
	font-size: 13px;
	font-weight: 700;
	text-transform: uppercase;
	box-shadow: 0 4px 12px rgba(0,0,0,.18);
	z-index: 1;
}

.sba__close:focus {
	outline: 2px solid #2684ff;
	outline-offset: 2px;
}

.sba__close:hover {
	background: #e13229;
	box-shadow: 0 3px 10px rgba(255,59,48,.5);
}

.sba__content {
	min-height: 60px; /* 広告高さの最低値 */
	width: 100%;
	text-align: center;
}