/* ================ */
/* === Teaching === */
/* ================ */

.teaching-page {
  display: flex;
  gap: 85px;
  align-items: flex-start; /* Ensure both image and text align to the top */
  justify-content: flex-start; /* Align content to the top-left */
}

.teaching-page .left {
  flex-shrink: 0;
  width: 950px;
}

.teaching {
  background: #f5f5f5;
  padding: 8px 16px;
  border-radius: 10px;
  /* margin-top: 16px; */
}

.teaching h3 {
  margin: 0 0 8px 0;
  font-size: 22px;
  font-weight: 600;
}

.teaching p {
  margin-top: 0;
}

.teaching p + h3 {
  margin: 0 0 0px 0;
  font-size: 18px;
  font-weight: 300;
}


.teaching .course-title {
  font-size: 20px;
  margin-bottom: 16px;
  margin-top: 0px;
}
.teaching .course-title .fa-square {
  font-size: 8px;
  margin-right: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: 3px;
  line-height: 1;
}


/* ===== Course Card ===== */
.course-card {
  display: flex;
  gap: 25px;
  align-items: flex-start;
  position: relative;
}

.course-card .course-text {
  flex: 1;
}

.course-card .course-description {
  margin: 8px 0px 24px 0px;
  color: #333;
  text-align: justify;

}

.course-card .course-materials summary {
  cursor: pointer;
  font-weight: 500;
  margin-bottom: 16px;
  text-decoration-line: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.course-card .course-materials ul {
  margin: 0px 0px 0px 18px;
  padding: 0;
}
.course-card .course-materials li {
  margin-bottom: 6px;
}
.course-card .course-materials a {
  color: #1a73e8;
  text-decoration: none;
}
.course-card .course-materials a:hover {
  text-decoration: underline;
}

.course-card .course-image {
  margin-left: auto;
  width: 220px;
  flex-shrink: 0;
  margin: 8px 0px 8px 0px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.course-card .course-image img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  background: #fff;
}

.course-card .course-btn {
  margin-top: 12px;
  width: 100%;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 10px 0;
}

.course-card .course-btn {
  box-shadow: 0 6px 14px rgba(26,115,232,0.10);
}
.course-card .course-btn.btn.outline {
  border: 2px solid #1a73e8;
}
.course-card .course-btn:hover {
  box-shadow: 0 8px 20px rgba(26,115,232,0.14);
}


/* ===== Lecture list  ===== */

.lecture-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 4px 0px 24px 16px;
}

.lecture-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  column-gap: 24px;
  align-items: start;
}

.lecture-date {
  font-size: 14px;
  color: #6c6c6c;
  white-space: nowrap;
}

.lecture-pdf {
  display: block; /* place below the date */
  margin-top: 0px;
  color: #1a73e8;
  text-decoration: none;
  font-size: 13px;
  font-weight: 400;
}

.lecture-pdf .fa-file-pdf {
  display: inline-block;
  font-size: 13px;
  vertical-align: middle;
  margin-right: 0px;
}

.lecture-title {
  font-size: 16px;
  font-weight: 400;
  color: #1a73e8;
  text-decoration: none;
}

.lecture-title .lecture-code {
  color: #6c6c6c; /* keep [L0X] grayish */
  font-weight: 500;
  margin-right: 0px;
}

.lecture-description {
  margin-top: 0px;
  font-size: 13px; /* slightly smaller */
  color: #4a6f8a;
  line-height: 1.25;
}


/* ================================================== */
/* Mobile */
@media (max-width: 900px) {
  .teaching-page {
    grid-template-columns: 1fr;
  }

  .course-card { flex-direction: column; }
  .course-card .course-btn {
    position: static;
    margin-top: 12px;
    align-self: flex-end;
  }
}