.dl_list {
  position: relative;
  padding: 12rem 0px 12rem;
  background-color: #fff;
}
.dl_list .head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 6rem;
}
.dl_list .head .tcon {
  flex-shrink: 0;
}
.dl_list .head .intro {
  max-width: 54rem;
  color: var(--text);
  font-size: 1.8rem;
  line-height: 2.8rem;
}
/* download icon shared by every download action (currentColor mask) */
.dl_list .dl::before {
  content: '';
  flex-shrink: 0;
  width: 1.8rem;
  height: 1.8rem;
  background-color: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3.5v11.5M7.2 10.4 12 15.2l4.8-4.8'/%3E%3Cpath d='M4 16.5v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-2'/%3E%3C/svg%3E") no-repeat center / contain;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3.5v11.5M7.2 10.4 12 15.2l4.8-4.8'/%3E%3Cpath d='M4 16.5v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-2'/%3E%3C/svg%3E") no-repeat center / contain;
}
/* hover badge on covers */
.dl_list .cover {
  position: relative;
  display: block;
  cursor: pointer;
}
.dl_list .cover .ic {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 6.4rem;
  height: 6.4rem;
  margin: -3.2rem 0px 0px -3.2rem;
  border-radius: 50%;
  color: var(--primary);
  background-color: #fff;
  box-shadow: 0px 1rem 3rem rgba(4, 17, 45, 0.25);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.35s, transform 0.35s;
}
.dl_list .cover .ic::before {
  content: '';
  width: 2.4rem;
  height: 2.4rem;
  background-color: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3.5v11.5M7.2 10.4 12 15.2l4.8-4.8'/%3E%3Cpath d='M4 16.5v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-2'/%3E%3C/svg%3E") no-repeat center / contain;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3.5v11.5M7.2 10.4 12 15.2l4.8-4.8'/%3E%3Cpath d='M4 16.5v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-2'/%3E%3C/svg%3E") no-repeat center / contain;
}
.dl_list .cover:hover .ic {
  opacity: 1;
  transform: scale(1);
}

/* complete catalogue feature card */
.dl_list .full {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6rem;
  margin-top: 5.6rem;
  padding: 6.4rem 8rem 6.4rem 7.2rem;
  border-radius: 2rem;
  overflow: hidden;
  background: var(--grad_card);
}
.dl_list .full::before {
  content: '';
  position: absolute;
  right: -14rem;
  top: 50%;
  width: 76rem;
  height: 76rem;
  margin-top: -38rem;
  border-radius: 50%;
  border: 1px solid rgba(111, 168, 236, 0.16);
  box-shadow: 0px 0px 0px 7rem rgba(111, 168, 236, 0.035), 0px 0px 0px 14rem rgba(111, 168, 236, 0.025);
  pointer-events: none;
}
.dl_list .full::after {
  content: '';
  position: absolute;
  inset: 0px;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 4rem 4rem;
  -webkit-mask-image: linear-gradient(90deg, transparent 30%, #000 100%);
  mask-image: linear-gradient(90deg, transparent 30%, #000 100%);
  pointer-events: none;
}
.dl_list .full .text {
  position: relative;
  z-index: 1;
  max-width: 58rem;
}
.dl_list .full .label {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  color: var(--accent_light);
  font-weight: 500;
  font-size: 1.4rem;
  line-height: 2rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.dl_list .full .label::before {
  content: '';
  width: 2.7rem;
  height: 1px;
  background-color: currentColor;
}
.dl_list .full h3 {
  margin-top: 1.6rem;
  color: #fff;
  font-weight: 700;
  font-size: 4rem;
  line-height: 4.8rem;
}
.dl_list .full .text p {
  margin-top: 1.6rem;
  color: rgba(255, 255, 255, 0.72);
  font-size: 1.7rem;
  line-height: 2.7rem;
}
.dl_list .full .check_list {
  display: grid;
  gap: 1rem;
  margin-top: 2.8rem;
}
.dl_list .full .btns {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  margin-top: 4rem;
}
.dl_list .full .btns a {
  gap: 1rem;
}
.dl_list .books {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  display: flex;
  align-items: flex-start;
  gap: 4rem;
}
.dl_list .books li {
  width: 25rem;
}
.dl_list .books li:first-child {
  margin-top: 5.6rem;
}
.dl_list .books .cover {
  height: 34.4rem;
  border-radius: 0.4rem 1rem 1rem 0.4rem;
  overflow: hidden;
  background-color: #fff;
  box-shadow: 0px 3rem 6rem rgba(0, 6, 20, 0.45), 0px 0.4rem 1rem rgba(0, 6, 20, 0.25);
  transition: transform 0.4s, box-shadow 0.4s;
}
.dl_list .books .cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.dl_list .books .cover::before {
  content: '';
  position: absolute;
  left: 0px;
  top: 0px;
  bottom: 0px;
  z-index: 1;
  width: 1.6rem;
  background: linear-gradient(90deg, rgba(4, 17, 45, 0.28) 0%, rgba(4, 17, 45, 0.06) 60%, rgba(255, 255, 255, 0.12) 100%);
}
.dl_list .books .cover::after {
  content: '';
  position: absolute;
  inset: 0px;
  z-index: 1;
  background-color: rgba(4, 17, 45, 0.28);
  opacity: 0;
  transition: opacity 0.35s;
}
.dl_list .books .cover:hover {
  transform: translateY(-0.8rem);
  box-shadow: 0px 4rem 7rem rgba(0, 6, 20, 0.5), 0px 0.4rem 1rem rgba(0, 6, 20, 0.25);
}
.dl_list .books .cover:hover::after {
  opacity: 1;
}
/* revision 4: catalogue title only, centred under the cover (no file format / size) */
.dl_list .books p {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
  text-align: center;
}
.dl_list .books p strong {
  color: #fff;
  font-weight: 600;
  font-size: 1.6rem;
  line-height: 2.2rem;
}

/* series catalogues */
.dl_list .series_head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 4rem;
  margin-top: 10rem;
  padding-bottom: 2.8rem;
  border-bottom: 1px solid var(--line);
}
.dl_list .series_head h3 {
  color: var(--title);
  font-weight: 700;
  font-size: 3.2rem;
  line-height: 4rem;
}
.dl_list .series_head p {
  color: var(--text2);
  font-size: 1.6rem;
  line-height: 2.4rem;
}
.dl_list .items {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3.2rem 2.4rem;
  margin-top: 4rem;
}
.dl_list .item {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 1.6rem;
  overflow: hidden;
  background-color: #fff;
  transition: transform 0.35s, box-shadow 0.35s, border-color 0.35s;
}
.dl_list .item:hover {
  transform: translateY(-0.6rem);
  border-color: rgba(11, 61, 135, 0.28);
  box-shadow: 0px 1.6rem 3.6rem rgba(11, 20, 46, 0.1);
}
.dl_list .item .cover {
  padding: 2.4rem 2.4rem 2.6rem;
  background: linear-gradient(180deg, var(--light) 0%, #e8edf2 100%);
}
.dl_list .item .cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 0.3rem 0.8rem 0.8rem 0.3rem;
  box-shadow: 0px 1.4rem 2.8rem rgba(11, 20, 46, 0.18), 0px 0.2rem 0.6rem rgba(11, 20, 46, 0.12);
  transition: transform 0.45s;
}
.dl_list .item:hover .cover img {
  transform: scale(1.03);
}
.dl_list .item .info {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 2rem 2.4rem 2.4rem;
}
.dl_list .item h3 {
  margin: 1.2rem 0px 2.4rem;
  color: var(--title);
  font-weight: 600;
  font-size: 1.8rem;
  line-height: 2.5rem;
}
.dl_list .item .btn_line {
  width: 100%;
  height: 4.8rem;
  margin-top: auto;
  font-size: 1.5rem;
}

/* help strip */
.dl_list .more {
  display: flex;
  align-items: center;
  gap: 3.2rem;
  margin-top: 8rem;
  padding: 4rem 4.8rem;
  border-radius: 2rem;
  background-color: var(--light);
}
.dl_list .more .ic {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 7.2rem;
  height: 7.2rem;
  border-radius: 50%;
  background-color: #fff;
}
.dl_list .more .ic img {
  display: block;
  width: 3.4rem;
  height: 3.4rem;
}
.dl_list .more .syedittext {
  flex: 1;
}
.dl_list .more strong {
  display: block;
  color: var(--title);
  font-weight: 600;
  font-size: 2.2rem;
  line-height: 3rem;
}
.dl_list .more p {
  margin-top: 0.6rem;
  color: var(--text);
  font-size: 1.6rem;
  line-height: 2.4rem;
}
.dl_list .more .btns {
  flex-shrink: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
}

.dl_list .content .items{
  grid-template-columns: repeat(auto-fill,minmax(min(25rem,100%),1fr));
}

@media screen and (min-width: 769px) and (max-width: 1024px) {
  .dl_list .head {
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }
  .dl_list .head .intro {
    max-width: none;
  }
  .dl_list .full {
    gap: 4rem;
    padding: 5.6rem 5.6rem;
  }
  .dl_list .books {
    gap: 2.8rem;
  }
  .dl_list .books li {
    width: 22rem;
  }
  .dl_list .books .cover {
    height: 30.2rem;
  }
  .dl_list .items {
    grid-template-columns: repeat(5, 1fr);
    gap: 2.4rem 1.6rem;
  }
  .dl_list .item .cover {
    padding: 1.6rem 1.6rem 1.8rem;
  }
  .dl_list .item .info {
    padding: 1.6rem 1.6rem 1.8rem;
  }
  .dl_list .item h3 {
    font-size: 2rem;
    line-height: 2.7rem;
  }
  .dl_list .item .btn_line {
    padding: 0px 1rem;
  }
  .dl_list .more {
    flex-wrap: wrap;
  }
  .dl_list .more .btns {
    width: 100%;
    padding-left: 10.4rem;
  }
}

@media screen and (max-width: 768px) {
  .dl_list {
    padding: 60px 0px 64px;
  }
  .dl_list .head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .dl_list .head .intro {
    font-size: 15px;
    line-height: 1.7;
  }
  .dl_list .dl::before {
    width: 16px;
    height: 16px;
  }
  .dl_list .cover .ic {
    display: none;
  }
  .dl_list .full {
    flex-direction: column;
    align-items: stretch;
    gap: 32px;
    margin-top: 28px;
    padding: 32px 20px 28px;
    border-radius: 14px;
  }
  .dl_list .full::before {
    right: -160px;
    top: auto;
    bottom: -200px;
    width: 460px;
    height: 460px;
    margin-top: 0px;
  }
  .dl_list .full .label {
    gap: 10px;
    font-size: 12px;
    line-height: 18px;
  }
  .dl_list .full .label::before {
    width: 22px;
  }
  .dl_list .full h3 {
    margin-top: 10px;
    font-size: 24px;
    line-height: 1.3;
  }
  .dl_list .full .text p {
    margin-top: 10px;
    font-size: 14px;
    line-height: 1.65;
  }
  .dl_list .full .check_list {
    gap: 6px;
    margin-top: 16px;
  }
  .dl_list .full .check_list li {
    padding-left: 26px;
    font-size: 14px;
    line-height: 22px;
  }
  .dl_list .full .check_list li::before {
    top: 4px;
    width: 15px;
    height: 15px;
    background-size: 9px;
  }
  .dl_list .full .btns {
    flex-direction: column;
    gap: 10px;
    margin-top: 24px;
  }
  .dl_list .full .btns a {
    width: 100%;
    height: 48px;
    font-size: 15px;
  }
  .dl_list .books {
    order: -1;
    justify-content: center;
    gap: 16px;
  }
  .dl_list .books li {
    width: calc(50% - 8px);
    max-width: 170px;
  }
  .dl_list .books li:first-child {
    margin-top: 18px;
  }
  .dl_list .books .cover {
    height: auto;
    aspect-ratio: 25 / 34.4;
  }
  .dl_list .books .cover::before {
    width: 10px;
  }
  .dl_list .books p {
    margin-top: 12px;
  }
  .dl_list .books p strong {
    font-size: 14px;
    line-height: 20px;
  }
  .dl_list .series_head {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    margin-top: 48px;
    padding-bottom: 16px;
  }
  .dl_list .series_head h3 {
    font-size: 22px;
    line-height: 1.3;
  }
  .dl_list .series_head p {
    font-size: 14px;
    line-height: 1.6;
  }
  .dl_list .items {
    grid-template-columns: 1fr 1fr;
    gap: 14px 12px;
    margin-top: 20px;
  }
  .dl_list .item {
    border-radius: 12px;
  }
  .dl_list .item .cover {
    padding: 14px 14px 16px;
  }
  .dl_list .item .info {
    padding: 12px 12px 14px;
  }
  .dl_list .item h3 {
    margin: 8px 0px 14px;
    font-size: 14px;
    line-height: 19px;
  }
  .dl_list .item .btn_line {
    gap: 6px;
    height: 38px;
    padding: 0px 8px;
    border-radius: 6px;
    font-size: 13px;
  }
  .dl_list .more {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-top: 40px;
    padding: 24px 20px;
    border-radius: 14px;
  }
  .dl_list .more .ic {
    width: 52px;
    height: 52px;
  }
  .dl_list .more .ic img {
    width: 26px;
    height: 26px;
  }
  .dl_list .more strong {
    font-size: 18px;
    line-height: 1.4;
  }
  .dl_list .more p {
    font-size: 14px;
    line-height: 1.6;
  }
  .dl_list .more .btns {
    width: 100%;
    gap: 10px;
  }
  .dl_list .more .btns a {
    flex: 1;
    height: 46px;
    padding: 0px 14px;
    font-size: 14px;
  }

  .dl_list .content .full .text{
    max-width: unset;
  }
}