/* 答题页选项样式：隐藏原生单选框，使用 SVG 描边动画表现选中状态。 */
*,
*:after,
*::before {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

body {
	-webkit-user-select: none;
	/* Chrome, Opera, Safari */
	-moz-user-select: none;
	/* Firefox */
	-ms-user-select: none;
	/* IE 10+ */
	user-select: none;
	/* Standard syntax */
}

/* 这里保留 ac-custom 作为命名空间，具体布局交由内部元素控制。 */

.ac-custom h2 {
	font-weight: 300;
	font-size: 2.5em;
	padding: 0 0 0.5em;
	color: #2c3e50;
}

.ac-custom ul,
.ac-custom ol {
	margin-left: 6%;
	list-style: none;
	padding: 0;
}

.ac-custom li {
	margin: 0 auto;
	padding: 2em 0;
	position: relative;
}

.ac-custom label {
	/* 文本左侧预留出图形控件的位置。 */
	display: inline-block;
	position: relative;
	font-size: 2em;
	padding: 0 0 0 60px;
	vertical-align: top;
	color: rgba(0, 0, 0, 0.5);
	cursor: pointer;
	-webkit-transition: color 0.3s;
	transition: color 0.3s;
}

.ac-custom input[type="checkbox"],
.ac-custom input[type="radio"],
.ac-custom label::before {
	width: 50px;
	height: 50px;
	top: 50%;
	left: 0;
	margin-top: -25px;
	position: absolute;
	cursor: pointer;
}

.ac-custom input[type="checkbox"],
.ac-custom input[type="radio"] {
	opacity: 0;
	-webkit-appearance: none;
	appearance: none;
	display: inline-block;
	vertical-align: middle;
	z-index: 100;
}

.ac-custom label::before {
	content: '';
	border: 4px solid #fff;
	-webkit-transition: opacity 0.3s;
	transition: opacity 0.3s;
}

.ac-radio label::before {
	border-radius: 50%;
}

.ac-custom input[type="checkbox"]:checked+label,
.ac-custom input[type="radio"]:checked+label {
	color: #fff;
}

.ac-custom input[type="checkbox"]:checked+label::before,
.ac-custom input[type="radio"]:checked+label::before {
	opacity: 0.8;
}

/* 通用 SVG 描边样式，所有动画路径都基于这套视觉规范。 */

.ac-custom svg {
	position: absolute;
	width: 40px;
	height: 40px;
	top: 50%;
	margin-top: -20px;
	left: 5px;
	pointer-events: none;
}

.ac-custom svg path {
	stroke: #fdfcd3;
	stroke-width: 13px;
	stroke-linecap: round;
	stroke-linejoin: round;
	fill: none;
}

/* 以下开始按控件类型细分尺寸和动画区域。 */

/* Circle */
.ac-circle input[type="checkbox"],
.ac-circle input[type="radio"],
.ac-circle label::before {
	width: 30px;
	height: 30px;
	margin-top: -15px;
	left: 10px;
	position: absolute;
}

.ac-circle label::before {
	background-color: #fff;
	border: none;
}

.ac-circle svg {
	width: 70px;
	height: 70px;
	margin-top: -35px;
	left: -10px;
}

.ac-circle svg path {
	stroke-width: 5px;
}

/* Box Fill */
.ac-boxfill svg path {
	stroke-width: 8px;
}

/* Swirl */
.ac-swirl svg path {
	stroke-width: 8px;
}

/* List */
.ac-list ol {
	list-style: decimal;
	list-style-position: inside;
}

.ac-list ol li {
	font-size: 2em;
	padding: 1em 1em 0 2em;
	text-indent: -40px;
}

.ac-list ol li label {
	font-size: 1em;
	text-indent: 0;
	padding-left: 30px;
}

.ac-list label::before {
	display: none;
}

.ac-list svg {
	width: 100%;
	height: 80px;
	left: 0;
	top: 1.2em;
	margin-top: 0px;
}

.ac-list svg path {
	stroke-width: 4px;
}

/* Media Queries */
@media screen and (max-width: 50em) {
	section {
		font-size: 80%;
	}

	.ac-custom h2 {
		font-size: 30px !important;
	}

	li {
		font-size: 70%;
	}

	.flexWidth {
		width: 100%;
		margin: 20px;
	}
}

@media screen and (min-width: 800px) {
	.flexWidth {
		width: 60%;
	}
}