.htl-section {
  padding: 80px 0 100px;
  background: #f5f8fa;
}

.htl-section .section-title-group {
  text-align: left;
  margin-bottom: 60px;
}

.htl-carousel {
  display: flex;
  align-items: center;
  gap: 24px;
}

.htl-prev,
.htl-next {
  width: 48px;
  height: 48px;
  border: 1px solid #d0d0d0;
  background: #fff;
  border-radius: 50%;
  cursor: pointer;
  color: #666;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  flex-shrink: 0;
}

.htl-prev:hover,
.htl-next:hover {
  background: #036eb7;
  border-color: #036eb7;
  color: #fff;
}

.htl-prev.disabled,
.htl-next.disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

.htl-track-wrapper {
  flex: 1;
  overflow: hidden;
}

.htl-track {
  display: flex;
  align-items: flex-start;
  position: relative;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  box-sizing: border-box;
}

.htl-axis {
  position: absolute;
  top: 27px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, #036eb7, #4DB5FF, #036eb7);
  pointer-events: none;
}

.htl-year {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  transition: all 0.4s ease;
  box-sizing: border-box;
  cursor: pointer;
}

.htl-dot {
  width: 16px;
  height: 16px;
  background: #fff;
  border: 3px solid #036eb7;
  border-radius: 50%;
  position: relative;
  z-index: 2;
  margin-top: 20px;
  transition: all 0.4s ease;
}

.htl-year.active .htl-dot {
  background: #036eb7;
  transform: scale(1.5);
  box-shadow: 0 0 0 6px rgba(3, 110, 183, 0.2);
}

.htl-label {
  margin-top: 16px;
  font-size: 22px;
  font-weight: 500;
  color: #666;
  letter-spacing: 1px;
  transition: all 0.4s ease;
}

.htl-year.active .htl-label {
  font-size: 28px;
  font-weight: 700;
  color: #036eb7;
}

/* Detail Section */
.htl-details {
  display: none;
  flex-direction: column;
  gap: 30px;
  margin-top: 60px;
}

.htl-details.active {
  display: flex;
}

.htl-detail {
  display: flex;
  gap: 40px;
  padding: 40px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.04);
  border: 1px solid #e8ecf0;
}

.htl-detail-img {
  width: 380px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  background: #f0f4f8;
}

.htl-detail-img img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
}

.htl-detail-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.htl-detail-time {
  font-size: 18px;
  font-weight: 700;
  color: #036eb7;
  margin-bottom: 16px;
}

.htl-detail-text {
  font-size: 16px;
  color: #555;
  line-height: 2;
  text-align: justify;
}

@media screen and (max-width: 1024px) {
  .htl-label {
    font-size: 18px;
  }
  .htl-year.active .htl-label {
    font-size: 22px;
  }
  .htl-detail {
    gap: 30px;
    padding: 30px;
  }
  .htl-detail-img {
    width: 280px;
  }
}

@media screen and (max-width: 768px) {
  .htl-section {
    padding: 50px 0 60px;
  }
  .htl-section .section-title-group {
    margin-bottom: 40px;
  }
  .htl-prev,
  .htl-next {
    width: 36px;
    height: 36px;
  }
  .htl-label {
    font-size: 16px;
  }
  .htl-year.active .htl-label {
    font-size: 20px;
  }
  .htl-detail {
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    margin-top: 40px;
  }
  .htl-detail-img {
    width: 100%;
    height: 200px;
  }
  .htl-detail-text {
    font-size: 15px;
    line-height: 1.8;
  }
}