#course_frame {
    display: flex;
}

#course_content {
    margin: 0;
    padding: 0;
}

#course_info_head_1 {
    display: flex;
}

#course_info_head_face img {
    width: 100%;
    border-radius: 12px;
}

.section_inner {
    max-width: 960px;
    margin: 0 auto;
}

#course_info_head_title {
    padding: 12px 0;
}

#course_title {
    font-size: 22px;
    font-weight: 700;
}

#course_subtitle {
    font-size: 13px;
    font-weight: 600;
    padding: 10px 0;
}

#lesson_list_shell {
    padding: 2rem 1rem;
    background-color: #f5f5f5;
}

.course_info_block {
    padding: 1rem 0;
}
.course_info_block h2 {
    font-size: 16px;
}
.course_info_block p {
    white-space: pre-wrap;
}
#lesson_list .lesson_card {
    width: 50%;
    padding: 15px;
}
.datatime {
    display: inline;
    padding: 1px 4px;
}
.not_started {
    background-color: orangered;
    color: var(--bg-color);
}
.in_progress,
.already_over {
    color: var(--btn-hover-bg-color);
}
.lesson_card .title {
    padding: 5px;
    font-size: 17px;
    font-weight: 600;
}
.curr_lesson {
    border-left: 2px solid var(--tool-bt-bg-color1);
}
.curr_lesson a {
    color: var(--main-color);
}
.not_curr_lesson {
    border-left: 2px solid var(--border-line-color);
    color: gray;
}
.not_curr_lesson a {
    color: gray;
}
#lesson_info_head_2 {
    padding: 1rem 0;
    border-top: 1px solid var(--border-line-color);
    border-bottom: 1px solid var(--border-line-color);
}

.disable {
	cursor: not-allowed;
	opacity: 0.5;
}

.padding_2_1rem {
	padding: 2rem 1rem;
}

#main_video_win iframe {
	width: 100%;
	height: 100%;
}

#course_frame {
	display: flex;
}

#course_content {
	margin: 0;
	padding: 0;
}

#course_info_head_1 {
	display: grid;
	grid-template-columns: 200px 1fr;
	grid-gap: 20px;
}

#course_info_head_face img {
	width: 200px;
	height: 200px;
	border-radius: 12px;
	object-fit: cover;
}

.section_inner {
	max-width: 90vw;
	margin: 0 auto;
}

#course_info_head_title {
	display: flex;
	flex-direction: column;
	word-wrap: break-word;
}

#course_title {
	font-size: 22px;
	font-weight: 700;
}

#course_subtitle {
	font-size: 13px;
	padding: 10px 0;
	word-wrap: break-word;
}

#course_button {
	margin-top: auto;
}

#lesson_list_shell {
	padding: 2rem 1rem;
	background-color: #f5f5f5;
}

.course_info_block {
	padding: 1rem 0;
}

#course_info_summary {
	border-top: 1px solid var(--border-line-color);
	border-bottom: 1px solid var(--border-line-color);
}

.course_info_block h2 {
	font-size: 16px;
}

#lesson_list {
	column-count: 2;
	position: relative;
}

#lesson_list .lesson_card {
	padding: 10px 10px 10px 0;
	-webkit-column-break-inside: avoid;
	page-break-inside: avoid;
	break-inside: avoid;
}

.datatime {
	display: inline;
}

.not_started {
	background-color: orangered;
	color: var(--bg-color);
}

.in_progress,
.already_over {
	color: var(--btn-hover-bg-color);
}

.lesson_card .title {
	margin-top: 5px;
	font-size: 17px;
	font-weight: 600;
	display: -webkit-box;
	-webkit-box-orient: vertical;
	overflow: hidden;
	text-overflow: ellipsis;
	width: 100%;
	-webkit-line-clamp: 2;
}

#course_info_head_2 {
	margin: 1rem 0;
}