/* 全局样式 */
body {
    background-color: #f4f4f4;
    background-image: url();
    background-repeat: repeat-x;
    background-position: top;
}

body,
form {
    margin: 0;
    padding: 0;
    font-size: 12px;
}

* {
    margin: 0;
    padding: 0;
    font-family: 'Helvetica Neue', 'STHeiti', 'Microsoft YaHei', Helvetica, Arial, sans-serif;
}

img {
    border: 0;
}

/* 通用布局 */
.width {
    width: 1200px;
    background: #f4f4f4;
    margin: auto;
    overflow: hidden;
}

.width_i {
    width: 1200px;
    background: #f4f4f4;
    margin: auto;
    overflow: hidden;
}

.c {
    clear: both;
}

.w {
    width: 1200px;
    height: 105px;
    background: #fff;
    margin: auto;
}

.t {
    width: 100%;
    height: 105px;
    background: #fff;
    margin: auto;
    border-bottom: 1px solid #efefef;
}

/* 头部导航 */
#menu_n {
    float: left;
    position: relative;
    z-index: 999;
    background-color: #fff;
    margin-left: -20px;
    color: #333;
    font-size: 16px;
    clear: both;
}

.logo_n {
    display: inline-block;
    width: 300px;
    height: 105px;
    position: absolute;
    padding: 0;
}

.top_r_n {
    float: left;
    display: inline-block;
    line-height: 105px;
    position: absolute;
    padding-left: 15px;
    width: 190px;
    height: 105px;
}

#menu_n ul {
    list-style: none;
    padding-left: 425px;
}

#menu_n ul li {
    line-height: 105px;
    height: 105px;
    text-align: center;
    position: relative;
    float: left;
}

#menu_n a {
    color: #111;
    display: block;
    padding: 0 20px;
    white-space: nowrap;
    text-decoration: none;
}

#menu_n a:hover {
    color: #f30;
    text-decoration: underline;
}

#menu_n ul li ul li {
    width: 150px;
    border-bottom: 1px solid #efefef;
    line-height: 50px;
    height: 50px;
    background-color: #f9f9f9;
}

#menu_n ul li ul li a {
    color: #333;
    text-decoration: none;
}

#menu_n ul li ul li a:hover {
    color: #fff;
    background-color: #f30;
    text-decoration: none;
}

#menu_n ul li ul {
    position: absolute;
    left: 0;
    top: 78px;
    display: none;
    padding-left: 0;
}

#menu_n ul li:hover ul {
    display: block;
}

/* 颜色与间距 */
.red {
    color: #f30;
}

.m7 {
    margin: 23px 10px 0 17px;
}

.m10 {
    margin: 10px;
}

.m15 {
    margin: 15px;
}

.m20 {
    margin: 10px 10px 35px 10px;
}

.m12 {
    margin: 15px 0 10px 10px;
}

.mt15 {
    margin-top: 15px;
}

/* 链接样式 */
a {
    text-decoration: none;
    color: #111;
}

a:hover {
    text-decoration: underline;
    color: #fd5825;
}

/* 左右布局 */
#left_n {
    float: left;
    width: 838px;
    margin: 0px 15px 0 0;
    display: inline;
    border-radius: 5px;
}

#right_n {
    float: left;
    width: 346px;
    margin-top: 15px;
}

.subject_bg {
    background: #fff;
    border-bottom: 1px solid #efefef;
    line-height: 51px;
    height: 51px;
}

.subject_bg_r {
    background: #fff;
    border-bottom: 1px solid #efefef;
    line-height: 42px;
    height: 42px;
}

/* 列表样式 */
.list_pictext_top {
    height: 49px;
    line-height: 49px;
    border-bottom: 1px solid #efefef;
}

.list_nav {
    background: #fcfcfc;
    font-size: 16px;
    font-family: microsoft yahei, verdana;
    color: #777;
    padding-left: 20px;
}

.list_nav a {
    font-family: microsoft yahei, verdana;
    color: #777;
}

.list_nav a:hover {
    color: #fd5825;
}
.info_other{
    color:#999;
    width:787px;
    font-size:15px;
    line-height:30px;
    margin:12px 10px 5px 15px;
    padding:0px 0px 5px 0px;
    font-family:"微软雅黑",Tahoma,Verdana,Lucida,Arial;
    border-bottom:1px solid #e5e5e5;
}
.info_other a{
    color:#999;
    padding-right:10px;
}
.info_other a:hover{
    color:#fd5825;
}

.list_pictext {
    margin: 25px 10px 0 10px;
    padding: 0 0 25px 0;
    line-height: 150%;
    color: #555;
    font-size: 12px;
    border-bottom: 1px solid #e5e5e5;
}

.list_pictext_img {
    margin-right: 20px;
}

.list_pictext font {
    font-size: 14px;
    color: #777;
    margin: 5px 0 0 0;
    padding-top: 25px;
}

.list_pictext font a {
    margin: 2px 10px 0 0;
    color: #777;
}

.list_pictext font a:hover {
    color: #fd5825;
    text-decoration: underline;
}

.pictext {
    color: #555;
    padding: 0;
    margin: 0;
    font-size: 20px;
    line-height: 32px;
}

.pictext a {
    color: #555;
}

.pictext a:hover {
    color: #fd5825;
    text-decoration: underline;
}

.pictext_jj {
    font-size: 16px;
    color: #666;
    margin: 0;
    padding: 5px 0 15px 15px;
    line-height: 29px;
}

.subject_bg2 {
    background: #fcfcfc;
    height: 42px;
    line-height: 42px;
    border-bottom: 1px solid #efefef;
}

.info_root1 {
    font-size: 17px;
    line-height: 39px;
    font-family: microsoft yahei, tahoma, verdana, lucida, arial;
    color: #555;
    padding-left: 18px;
    font-weight: bold;
}

.subject_title {
    font-size: 18px;
    font-weight: bold;
    font-family: microsoft yahei, tahoma, verdana, lucida, arial;
    color: #333;
    padding-left: 18px;
    line-height: 40px;
    height: 40px;
}

/* 边框样式 */
.border {
    width: 1198px;
    border: 1px solid #efefef;
    height: 100%;
    background: #ffffff;
}

.border_foot {
    width: 100%;
    border-top: 1px solid #efefef;
    height: 100%;
    background: #fff;
    padding-bottom: 15px;
    margin-top: 15px;
}

.border_page {
    margin-top: 15px;
    border: 1px solid #eee;
    height: 100%;
    background-color: #fff;
}

.border1 {
    width: 1200px;
    border: 0 solid #e4e4e4;
}

.index_hot_n {
    width: 345px;
    background: #fff;
    border: 1px solid #efefef;
}

.all_list_r {
    margin: 0;
    padding: 0 0 10px 0;
}

.all_list_r dt {
    line-height: 36px;
    margin: 0 10px 0 10px;
    padding-left: 2px;
    color: #555;
    font-size: 15px;
    font-family: "微软雅黑";
    border-bottom: 0 solid #efefef;
}

.all_list_r dt a {
    color: #555;
    font-family: "微软雅黑";
}

.all_list_r dt a:hover {
    text-decoration: underline;
    color: #0088e6;
}

/* 图片展示 */
.index_photo_kc {
    margin: 8px 10px 0px 18px;
    padding: 0;
    height: 486px;
}

.index_photo_kc li {
    float: left;
    width: 361px;
    height: 228px;
    margin: 4px 17px 0px 11px;
    line-height: 24px;
    display: inline;
    color: #333;
    font-size: 16px;
}

.index_photo_kc li div {
    color: #999;
    margin-top: 8px;
    margin-left: 1px;
    font-size: 14px;
}

.index_photo_kc img {
    width: 360px;
    height: 120px;
    border: 0 solid #d7d7d7;
    padding: 0;
    margin: 15px 0 5px 0;
    clear: both;
    border-radius: 5px;
}

.index_photo_kc img:hover {
    border: 0 solid #f5f5f5;
    border-radius: 5px;
    background-color: #fff;
    box-shadow: 1px 1px 10px 5px #e5e5e5;
}

.xian {
    clear: both;
    overflow: hidden;
    height: 1px;
    background-color: #e5e5e5;
    margin-top: 0;
}

.index_photo_hj {
    margin: 0;
    padding: 0;
    height: 548px;
}

.index_photo_hj dt {
    width: 24.8%;
    float: left;
    text-align: center;
    height: 270px;
    display: inline;
    margin-bottom: 0;
}

.index_photo_hj dt img {
    padding: 0;
    display: inline;
    border-radius: 5px;
}

.index_photo_hj dt div img:hover {
    border: 0 solid #f5f5f5;
    border-radius: 5px;
    background-color: #fff;
    box-shadow: 1px 1px 10px 5px #e5e5e5;
}

.index_photo_hj dt div {
    text-align: left;
    padding: 0;
    width: 267px;
    margin: 5px 0 0 13px;
    color: #333;
    line-height: 24px;
    font-size: 16px;
}

.index_photo_hj dt span {
    font-size: 14px;
    font-family: "微软雅黑";
    color: #999;
    padding: 0;
}


.index_photo_hj a {
    color: #333;
}

.index_photo_hj a:hover {
    color: #fd5825;
}

/* 文字样式 */
.index_link {
    margin: 0;
    padding: 15px 0 10px 0;
    width: 1200px;
}

.index_link dt {
    float: left;
    margin-bottom: 0;
    margin-left: 20px;
    margin-right: 20px;
    font-size: 16px;
}

.index_link dt a {
    color: #555;
}

.index_link dt a:hover {
    color: #fd5825;
}

/* 底部 */
#foot {
    font-size: 14px;
    text-align: center;
    padding: 16px 0;
    color: #555;
    line-height: 20px;
    font-family: "微软雅黑", tahoma, verdana, lucida, arial;
}

#foot a {
    font-family: "微软雅黑", tahoma, verdana, lucida, arial;
    color: #555;
}

#foot a:hover {
    font-family: "微软雅黑", tahoma, verdana, lucida, arial;
    color: #fd5825;
}

.foot_menu {
    color: #555;
    margin-bottom: 0;
    padding-bottom: 10px;
    padding-top: 15px;
}

.foot_menu a {
    color: #555;
}

.foot_menu a:hover {
    color: #f30;
}

.foot_i {
    color: #555;
    margin-bottom: 0;
    padding-bottom: 5px;
    padding-top: 5px;
}

.foot_i a {
    color: #555;
}

.foot_i a:hover {
    color: #f30;
}

.content_url_font {
    color: #999;
    font-weight: none;
    font-size: 12px;
}

/* 内容页 */
.info_title {
    font: 35px microsoft yahei;
    line-height: 46px;
    font-weight: bold;
    margin: 20px 15px 5px 15px;
    color: #333;
}

.info_wrapper {
    width: 100%;
    margin: 0 auto;
}

.info_content {
    width: 787px;
    line-height: 32px;
    font-size: 17px;
    font-family: 'Helvetica Neue', 'STHeiti', 'Microsoft YaHei', Helvetica, Arial, sans-serif;
    padding: 10px 15px 0 15px;
    color: #333;
}

.info_content p {
    margin: 20px 0;
    word-wrap: break-word;
    overflow: hidden;
}

.info_content img {
    max-width: 786px;
    width: expression((this.offsetWidth > 786) ? (this.width = 786 + 'px') : true);
    border: 0 solid #e5e5e5;
    padding: 0;
    text-align: center;
    margin-top: 8px;
    display: block;
}

.info_content a {
    color: #d30908;
    text-decoration: underline;
}

.info_content a:hover {
    color: #fd5825;
    text-decoration: underline;
}

/* 分页 */
.content_page {
    text-align: center;
    margin: 30px 0 35px 0;
    padding: 0;
    height: 35px;
    border-top: 0 solid #e5e5e5;
}

.content_page a {
    background: #fff;
    margin: 4px;
    padding: 5px 8px;
    border: 1px solid #ccc;
    font-size: 12px;
    color: #333;
    display: inline-block;
}

.content_page a:hover {
    background: #d50606;
    color: #fff;
    text-decoration: none;
    border: 1px solid #d50606;
}

.content_page span {
    background: #d50606;
    color: #fff;
    margin: 4px;
    padding: 5px 8px;
    border: 1px solid #d50606;
    font-size: 14px;
    display: inline-block;
}

.content_page_info {
    text-align: center;
    padding: 15px 0;
}

.content_page_info a {
    background: #fff;
    margin: 4px;
    padding: 5px 8px;
    border: 1px solid #ccc;
    font-size: 12px;
    color: #333;
    display: inline-block;
}

.content_page_info a:hover {
    background: #d50606;
    color: #fff;
    text-decoration: none;
    border: 1px solid #d50606;
}

.content_url {
    font-size: 15px;
    color: #555;
    margin: 0;
    padding: 0 20px 25px 25px;
    line-height: 32px;
}

.content_url a {
    color: #ac3a3a;
    padding: 0;
    font-family: "微软雅黑", tahoma, verdana, lucida, arial;
    text-decoration: underline;
}

.content_url a:hover {
    color: #fd5825;
    text-decoration: underline;
}

.top_ad_n {
    width: 1200px;
    float: left;
    margin: 15px 0 0 0;
    border: 0 solid #e4e4e4;
    display: inline;
}

.top_ad_n img {
    width: 1200px;
    height: 100px;
}

.pop_list6 {
    width: 100%;
    height: 455px;
    margin: 0;
    padding: 0;
}

.pop_list6 ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.pop_list6 li {
    float: left;
    width: 140px;
    height: 140px;
    margin: 6px 11px 5px 10px;
}

.pop_list6 li div {
    float: left;
    font-size: 14px;
    width: 146px;
    padding: 4px 0 5px 0;
    line-height: 20px;
}

.pop_list6 img {
    margin: 0;
    padding: 0;
    border: 0 solid #cacaca;
    margin-bottom: 0;
}

.pop_list6 a {
    color: #555;
    text-decoration: none;
}

.pop_list6 a:hover {
    text-decoration: underline;
    color: #f30;
}

.new2 {
    width: 100%;
}

.new2 ul {
    list-style: none;
    padding: 0 0 10px 0;
    margin: 8px 0 0 20px;
    color: #555;
    height: 208px;
}

.new2 ul li {
    float: left;
    width: 405px;
    line-height: 28px;
    padding-top: 5px;
    font-size: 15px;
    font-family: "微软雅黑";
}

.new2 ul li a {
    color: #333;
    font-family: "微软雅黑";
}

.new2 ul li a:hover {
    color: #fd5825;
    text-decoration: underline;
}

.title_index_1 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 49px;
    line-height: 1;
    margin: 0;
    padding: 0;
    padding-left: 15px; /* 左边空出15px，不贴边 */
}

.title_index_1 h2 {
    margin: 0;
    padding: 0;
}

.main-title {
    font-size: 20px;
    font-weight: bold;
    padding-left: 20px;
	line-height: 49px;
}

.more-link {
    margin-left: auto;
    font-size: 15px;
    color: #666;
    margin-right: 20px;
}

.more-link a {
    color: #888;
    line-height: 52px;
    height: 49px;
    padding-left: 0;
}

.more-link a:hover {
    color: #f30;
    text-decoration: underline;
}

.tag_info {
    font-size: 15px;
    color: #777;
    float: left;
    width: 95%;
    height: 100%;
    margin: 5px 25px 5px 15px;
    padding: 5px 10px;
}

.pop_article3 {
    margin-left: 11px;
    padding: 16px 0 5px 0;
}

.pop_article3 ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.pop_article3 li {
    float: left;
    width: 194px;
    height: 176px;
    padding: 0 5px;
}

.pop_article3 li div {
    float: left;
    width: 190px;
    padding: 2px 0 0 3px;
    line-height: 21px;
    font-size: 13px;
}

.pop_article3 a {
    color: #333;
    text-decoration: none;
}

.pop_article3 a:hover {
    text-decoration: underline;
    color: #fd5825;
}

.pop_article3 img {
    padding: 3px;
    border: 0 solid #e5e5e5;
    margin-bottom: 0;
}

/* 首页banner轮转 */
#banner {
    margin: 0 auto;
    padding: 0;
    width: 1200px;
    height: 400px;
    position: relative;
    z-index: 0;
}

.slides {
    margin: 0 auto;
    width: 1200px;
    height: 400px;
    overflow: hidden;
    position: relative;
}

.slide-pic {
    margin: 0;
    padding: 0;
    width: 1200px;
    overflow: hidden;
    list-style: none;
}

.slide-pic img {
    width: 1200px;
    height: 400px;
}

.slide-pic li {
    display: none;
}

.slide-pic li.cur {
    display: block;
}

.slide-li {
    margin: 0;
    padding: 0;
    left: 0;
    bottom: 0;
    position: absolute;
    width: 100%;
    height: 1px;
}

.slide-li li {
    margin: 0;
    padding: 0;
    width: 33.33%;
    height: 1px;
    float: left;
    overflow: hidden;
    list-style: none;
}

.slide-li a {
    width: 240px;
    height: 1px;
    color: #000;
    font-size: 12px;
    display: block;
}

.slide-li a:hover {
    color: #f00;
    text-decoration: none;
}

.op li {
    background: #999;
    filter: alpha(opacity=60);
    opacity: 0.3;
    height: 1px;
}

.op li.cur {
    background: #000;
    height: 1px;
}

.slide-txt span {
    display: none;
}

/* 右侧微信二维码客服 */
.QQ_S {
    width: 90px;
    height: 500px;
    position: fixed;
    right: 2px;
    top: 40%;
    z-index: 99999;
}

.Q_weixin {
    width: 100%;
    height: 115px;
    overflow: hidden;
    text-align: center;
}

/* 列表底部：分类 + 日期 同行布局 */
.list_meta {
  margin-top: 6px;
  font-size: 14px;
  color: #666;
  display: flex;
  gap: 15px;
}

.list_class a {
  color: #888;
  text-decoration: none;
}
.list_class a:hover {
  color: #666; /* 鼠标放上去稍微深一点，更精致 */
  text-decoration: none;
}

.list_date {
  color: #999;
}

h2 {
    font-size: 20px; /* 比正文大一点即可，正文一般14-16px */
    font-weight: bold;
    margin-top: 20px;
    margin-bottom: 10px;
    color: #333; /* 深灰色，比纯黑柔和 */
}

/* CAD 学习大纲 这类章节标题样式 */
.section-title {
  font-size: 22px;
  font-weight: bold;
  color: #333;
  margin: 30px 0 15px;
  padding-left: 0;
  line-height: 1.4;
  display: flex;
  align-items: center;
}

.section-title::before {
  content: "";
  width: 8px;
  height: 20px;
  background-color: #d81e06;
  margin-right: 6px;
  flex-shrink: 0;
}

.cad-outline{line-height:2;}
.cad-outline .section{
  font-size:18px;
  font-weight:bold;
  margin:14px 0 10px 0;
}
.cad-outline .item{
  padding-left:24px;
  margin:0 0 8px 0;
  line-height:1.8;
}