.course-visual {
    background: linear-gradient(180deg, #eef4f1, #f6faf8);
  }

  .course-grid {
    display: grid;
    gap: 28px;
  }

  .course-grid-featured {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .course-visual :global(.section-copy) {
    max-width: 860px;
  }

  .course-card {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 250, 248, 0.98));
    border: 1px solid rgba(16, 24, 40, 0.1);
    border-radius: 0;
    box-shadow: 0 18px 40px rgba(16, 24, 40, 0.08);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    position: relative;
    transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
  }

  .course-card:hover {
    border-color: rgba(47, 158, 158, 0.34);
    box-shadow: 0 24px 52px rgba(16, 24, 40, 0.12);
    transform: translateY(-8px);
  }

  .course-card::before {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    content: "";
    height: 100%;
    left: -160%;
    pointer-events: none;
    position: absolute;
    top: 0;
    transform: skewX(-18deg);
    transition: left 900ms ease;
    width: 56%;
    z-index: 2;
  }

  .course-card:hover::before {
    left: 160%;
  }

  .course-image-link {
    display: block;
  }

  .course-image-wrap {
    aspect-ratio: 1 / 1;
    background: #dfe7e2;
    overflow: hidden;
    position: relative;
  }

  .course-image-wrap img {
    display: block;
    height: 100%;
    object-fit: cover;
    transition: transform 420ms ease, filter 420ms ease;
    width: 100%;
  }

  .course-card:hover .course-image-wrap img {
    filter: saturate(1.02) contrast(1.02);
    transform: scale(1.045);
  }

  .course-card-body {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 14px;
    padding: 18px 20px 20px;
  }

  .course-code {
    color: #1f2937;
    font-size: 1rem;
    font-weight: 500;
    margin: 0;
  }

  .course-card h2,
  .invite-card h2 {
    font-family: "Noto Sans TC", Inter, system-ui, sans-serif;
    line-height: 1.2;
  }

  .course-grid-featured .course-card h2 {
    color: #1f2937;
    font-size: 1.08rem;
    font-weight: 650;
    line-height: 1.32;
    letter-spacing: 0;
    margin: 0;
  }

  .course-description {
    color: #475467;
    font-size: 1.02rem;
    font-weight: 400;
    line-height: 1.9;
    margin: 0;
  }

  .course-cta {
    align-self: start;
    background: #3b8f14;
    color: #fff;
    display: inline-flex;
    font-family: "Noto Sans TC", Inter, system-ui, sans-serif;
    font-size: 1rem;
    font-weight: 700;
    justify-content: center;
    margin-top: auto;
    min-height: 50px;
    min-width: 108px;
    padding: 12px 22px;
    transition: background-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
  }

  .course-cta:hover {
    background: #2f7610;
    box-shadow: 0 10px 20px rgba(59, 143, 20, 0.24);
    transform: translateY(-2px);
  }

  .invite-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    padding: 34px;
  }

  .invite-card p {
    color: #d0d5dd;
  }

  .invite-card .btn {
    margin-top: 1.5em;
  }

  @media (max-width: 1080px) {
    .course-grid-featured {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }
  }

  @media (max-width: 620px) {
    .course-grid-featured {
      grid-template-columns: 1fr;
    }

    .course-grid-featured .course-card h2 {
      font-size: 1.02rem;
    }
  }