* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "微軟正黑體";
}
a {
  text-decoration: none;
}
header {
  text-align: center;
  background-color: #ececec;
}
.logo img {
  transform: scale(0.7);
}
nav {
  background-color: #1d1d1d;
  padding: 8px 0;
}
nav ul {
  display: flex;
  gap: 20px;
  justify-content: center;
}
nav ul li {
  list-style: none;
}
li a {
  color: #fff;
  transition: all 0.2s ease-in;
  border-bottom: 2px solid transparent; /* 預設為透明 */
}
li a:link {
  color: #fff;
}
li a:hover {
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
}
main {
  position: relative;
  max-width: 850px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  background-color: rgba(46, 112, 75, 0.2);
}
.cover {
  z-index: 99;
  width: 100%;
  aspect-ratio: 850 / 585; /* 或直接填 16 / 9, 4 / 3 等比例 */
  background-image: url(https://www.1111edu.com.tw/edm/edu/ETG_T2_20250801/images/cover-bg.jpg);
  background-size: cover;
  background-position: center;
  color: #fff;
  padding: 100px 50px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 50px;
  transition: all 0.1s ease-in;
}
.cover:link,
.cover:visited {
  opacity: 1;
}

.cover:hover,
.cover:active {
  opacity: 0.95;
}
.cover h1 {
  font-size: 30px;
  text-align: end;
  text-decoration: underline 2px solid;
  text-underline-offset: 7px; /* 調整底線與文字的距離 */
  margin-top: 20px;
  line-height: 1.5;
}
.cover h3 {
  font-weight: 500;
  font-size: 16px;
  word-break: break-all;
  max-width: 225px;
  text-align: right;
}
.content {
  width: 100%;
  background-image: url(https://www.1111edu.com.tw/edm/edu/ETG_T2_20250801/images/main-bg.jpg);
  padding: 50px 8% 0px 8%;
}
.content .title {
  font-family: "Noto Serif HK";
  display: flex;
  justify-content: center;
  align-items: center;
  padding-bottom: 20px;
}
.title span {
  display: inline-block;
  font-size: 36px;
  line-height: 36px;
  font-weight: 600;
  color: #824d3a;
  border: #824d3a 1px solid;
  padding: 3px;
  padding-bottom: 4px;
}
.course-card {
  font-family: "Noto Sans TC";
  display: flex;
  margin: 30px 0px 40px 0;
  gap: 30px;
  /* align-items: center; */
}
.reverse {
  flex-direction: row-reverse;
}
.course-info {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.course-sort {
  display: flex;
  color: #8f5d08;
  line-height: 1;
  align-items: flex-start;
  gap: 10px;
}
.course-sort .no {
  color: #824d3a;
  font-size: 42px;
  font-weight: 800;
  border-bottom: 2px #824d3a solid;
  padding-bottom: 3px;
}
.course-sort .ono {
  font-weight: 600;
  padding-top: 5px;
  letter-spacing: 0.5px;
}
.course-title {
  position: relative;
  left: -16px;
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 1px;
  background-color: #ffffff7e;
  display: inline-block;
  border-radius: 50px;
  padding: 5px 20px;
  align-self: flex-start;
  text-align: justify;
}
.course-describe {
  color: #8f6516;
  text-align: justify;
}
.course-info ul {
  line-height: 1.2;
  list-style-position: inside;
}
.course-info ul li {
  list-style: none;
  line-height: 1.1rem;
  font-size: 14px;
  margin-bottom: 8px;
  text-align: justify;
  position: relative;
  padding-left: 1rem;
}
.course-info ul li:last-child {
  margin-bottom: 0;
}
.course-info ul li::before {
  position: absolute;
  content: "◆";
  display: inline-block;
  font-size: 12px;
  left: 0;
}
.course-sidebar {
  flex: 0 0 250px;
}
.course-sidebar img {
  width: 100%;
  border-radius: 50%;
  margin-bottom: 8px;
}
.signUp-btn {
  background-color: #ffbb00;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: #000;
  border-radius: 15px;
  padding: 6px 0;
  transition: all 0.2s ease-in;
  box-shadow: 0 0px 8px rgba(0, 0, 0, 0.1);
}
.signUp-btn:hover {
  background-color: #ecad00;
}
.ad-container {
  background-color: #d1d1d1;
  display: flex;
  justify-content: center;
  gap: 1.6rem;
  padding: 1.8rem;
}

.adBanner_306x160 {
  transition: all 0.3s ease;
  width: 100%;
}

.ad-link {
  display: inline-block;
  width: 80%;
}

.adBanner_306x160:hover {
  transform: scale(1.01);
}
.back-cover {
  position: relative;
  width: 100%;
}
.back-cover img {
  width: 100%;
}
.more-btn {
  position: absolute;
  background-color: #065d82;
  padding: 8px 20px 8px 30px;
  border-radius: 50px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 15px;
  letter-spacing: 2px;
  bottom: 10%;
  left: 10%;
  cursor: pointer;
  transition: all 0.2s ease;
}
.more-btn:hover {
  background-color: #013f5a;
}
footer {
  position: relative;
  top: -5px;
  background-color: #ccc;
}
.social-links {
  display: flex;
  gap: 20px;
  background-color: #000;
  color: #fff;
  font-size: 14px;
  letter-spacing: 2px;
  justify-content: center;
  padding: 0 30%;
}

.social-link {
  text-align: center;
  padding: 15px 0;
  flex: 1;
}
.social-link svg,
p {
  transition: all 0.1s ease-in;
}
.social-link p {
  margin-top: 8px;
  color: #fff;
}
.social-link:hover p {
  color: #ccc;
}
.social-link:hover svg path {
  fill: #ccc;
}
.company-info {
  background-color: #ececec;
  padding: 20px;
  text-align: center;
  font-size: 13px;
  letter-spacing: 2px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.company-info p a {
  color: #12389a;
  font-weight: 600;
}

/* RWD start*/
@media (max-width: 768px) {
  main {
    width: 100%;
  }
  .cover {
    padding: 100px 50px;
  }
  .content {
    padding: 20px 6% 0 6%;
  }
  .social-links {
    padding: 0 15%;
  }
}

@media (max-width: 430px) {
  .cover {
    width: 100%;
    background-size: cover;
    padding: 45px 25px;
    background-image: url(https://www.1111edu.com.tw/edm/edu/ETG_T2_20250801/images/cover-bg.jpg);
    display: inline-block;
    /* gap: 25px; */
  }
  .cover h1 {
    font-size: 22px;
  }
  .cover h3 {
    font-size: 14px;
    max-width: 200px;
  }
  .content {
    padding: 20px 15% 0 15%;
  }
  .content .title {
    justify-content: center;
    flex-wrap: wrap;
    row-gap: 12px;
  }
  .title span {
    font-size: 24px;
    line-height: 24px;
  }
  .content {
    background-image: url(https://www.1111edu.com.tw/edm/edu/ETG_T2_20250801/images/main-bg-m.jpg);
  }
  .course-card {
    flex-direction: column;
    gap: 0;
  }
  .course-title {
    font-size: 18px;
  }
  .social-links {
    padding: 0 5%;
  }
  .more-btn {
    padding: 6px 10px 6px 15px;
    font-size: 11px;
    left: 4%;
    gap: 10px;
  }
  .course-info {
    gap: 8px;
  }
  .social-link p {
    font-size: 13px;
  }
  .course-sidebar {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .course-sidebar img {
    transform: scale(0.8);
    margin-bottom: 0;
  }
  .signUp-btn {
    width: 70%;
  }

  .ad-link {
    display: block;
    width: 100%;
  }

  .ad-link img {
    width: 100%;
  }

  .ad-container {
    flex-direction: column;
    padding: 1.8rem 1.2rem;
    gap: 1.6rem;
  }
}