* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.khoa-main-section {
  background: #f0fff0;
  padding: 30px;
  text-align: center;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

.khoa-title-wrapper {
  display: inline-block;
  position: relative;
  margin-bottom: 40px;
}

.khoa-title {
  color: #006400;
  font-size: 30px;
  font-weight: 900;
  letter-spacing: 2px;
  margin: 0;
  position: relative;
  text-decoration: underline;
  text-transform: uppercase;
}

.khoa-khu-vuc-cac-ban {
  max-width: 800px;
  margin: 0 auto;
  background-color: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.khoa-danh-sach-ban-accordion {
  display: flex;
  flex-direction: column;
}

.khoa-muc-ban {
  border-bottom: 1px solid #e0e0e0;
}
.khoa-muc-ban:last-child {
  border-bottom: none;
}

.khoa-nut-mo-ban {
  background-color: #90EE90;
  color: #006400;
  padding: 18px 25px;
  width: 100%;
  border: none;
  text-align: left;
  font-size: 1.15em;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
  display: block;
  appearance: none;
  position: relative;
}

.khoa-nut-mo-ban:hover {
  background-color: #7CFC00;
}

.khoa-nut-mo-ban.active {
  background-color: #7CFC00;
}

.khoa-chi-tiet-ban {
  background-color: #fff;
  padding: 0 25px;
  display: flex;
  align-items: center;
  gap: 25px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease-out, opacity 0.3s ease-out 0.1s;
  text-align: left;
}

.khoa-chi-tiet-ban.active {
  max-height: 1000px;
  opacity: 1;
  padding: 25px;
  overflow: visible;
  transition: max-height 0.5s ease-in, padding 0.5s ease-in, opacity 0.4s ease-in;
}

.khoa-noi-dung-ban {
  flex: 1;
  color: #333;
}

.khoa-ten-ban {
  font-size: 1.6em;
  font-weight: bold;
  color: #006400;
  margin-bottom: 15px;
}

.khoa-thong-tin-truong-ban {
  font-size: 1em;
  color: #555;
  margin-bottom: 8px;
}
.khoa-thong-tin-truong-ban strong {
  font-weight: bold;
  color: #000;
}

.khoa-mo-ta-ban {
  font-size: 0.95em;
  color: #555;
  line-height: 1.6;
  margin-bottom: 10px;
}
.khoa-mo-ta-ban strong {
  font-weight: bold;
  color: #000;
}

.khoa-khung-anh-ban {
  flex-basis: 35%;
  max-width: 280px;
}

.khoa-hinh-anh-ban {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 5px;
  border: 1px solid #eee;
}

@media (max-width: 800px) {
  .khoa-main-section {
      padding: 15px;
  }

  .khoa-title {
      font-size: 24px;
  }

  .khoa-khu-vuc-cac-ban {
      max-width: none;
      border-radius: 5px;
  }

  .khoa-nut-mo-ban {
      padding: 15px 20px;
      font-size: 1.05em;
  }

  .khoa-chi-tiet-ban {
      flex-direction: column;
      align-items: stretch;
      gap: 15px;
      padding: 0 15px;
  }
  .khoa-chi-tiet-ban.active {
      padding: 20px 15px;
  }

  .khoa-ten-ban {
      font-size: 1.3em;
      text-align: center;
      margin-bottom: 10px;
  }
  .khoa-thong-tin-truong-ban,
  .khoa-mo-ta-ban {
      font-size: 0.9em;
      text-align: center;
  }

  .khoa-khung-anh-ban {
      flex-basis: auto;
      width: 80%;
      max-width: 250px;
      margin: 10px auto 0;
  }
}