*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  /* overflow: hidden; */
  overflow-x: hidden;
  position: relative;
  left: 0px;
  top: 0px;
  font-family: sans-serif, serif, "Noto Sans CJK TC", "Microsoft JhengHei", PingFang, STHeiti;
  letter-spacing: .05rem;
  font-size: 14px;
}

#container {
  display: flex;
  flex-direction: column;
  height: 100%;
  
}

header {
  flex: 0 0 auto;
  box-shadow: #3f3f3f 1px 0px 3px;
}

.main {
  flex: 1 0 auto;
  background-color: #fff;
}

footer {
  flex: 0 0 auto;
  width: 100%;
  background-color: #00356F;
  color: white;
  padding: 1rem;
  text-align: center;
  font-size: small;
}

footer p {
  margin-bottom: 0%;
}

/* 初始設定 end */

.content {
  margin: 0 auto;
  margin-top: 2rem;
  margin-bottom: 10rem;
  width: 90%;
  max-width: 1920px;
}

li {
  list-style: none;
}

a {
  text-decoration: none;
}
/* navbar */
nav{
  box-shadow: 0px 2px 3px #e4e4e4;
  background-color: #004288;
}

.navbar li {
  color: #fff;
}

.navbar-dark .navbar-nav .nav-link{
  margin: .75rem .5rem;
  color: #fff;
}

.navbar-dark .navbar-nav .nav-link:hover{
  color: #ffeea2;
}

.navbar-toggler {
  border: none;
  padding: .75rem 0;
}

@media (min-width: 992px) {
  .navbar-expand-lg .navbar-collapse {
      justify-content: flex-end;
  }
}

@media (max-width: 991.98px) {
  .nav-item {
      border-bottom: 1px dashed #e2e2e2;
  }
}

.page-title {
  text-align: center;
  font-size: 2rem;
  font-weight: bold;
  color: #403f50;
  margin-top: 2.5rem;
  margin-bottom: 1.5rem;
  line-height: 150%;
}

/* video_list */
.course-box {
  border: 1px #dfdfdf solid;
  border-radius: 1rem;
}

.course-box:hover {
  box-shadow: #c9c0c0 2px 2px 1px;
}
.img-box {
  background-image: linear-gradient(60deg,#1d3d96  0%,#a2e1ff  120%);
  height: 4rem;
  border-radius: 1rem 1rem 0 0;
  display: flex;
  align-items: center;
  padding: 1rem;
}

.course-box:hover .img-box {
  background-image: linear-gradient(60deg, #ffeea2 0%, #a2e1ff 100%);
}

.course-box:hover i {
  text-shadow: 1px 1px 1px gray;
}

.img-box i {
  font-size: 2.5rem;
  color: #fff;
}

.play-text {
  font-size: .75rem;
  margin-left: .3rem;
}

.course-info {
  padding: 1rem;
}

.course-title {
  font-size: 1rem;
  font-weight: bold;
  color: #403f50;
  margin-bottom: .5rem;
  line-height: 150%;

}

.course-teacher {
  font-size: .75rem;
  color: #403f50;
}