.product_nav {
  background-color: #f3f3f3;
  position: sticky;
  top: 0;
  z-index: 99;
  transition: all 0.3s;
}
.product_nav.opt {
  top: 83px;
}
.product_nav .title {
  display: block;
  font-size: 2rem;
  font-weight: 600;
  color: #171717;
  padding: 1rem 0;
  letter-spacing: 0.009rem;
}
.product_nav .nav {
  max-width: 100%;
}
.product_nav .nav .nav_list {
  display: flex;
  gap: 2rem 5.9rem;
}
.product_nav .nav .nav_item {
  display: block;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 1.7rem;
  font-weight: 600;
  color: #171717;
  border-bottom: 0.4rem solid transparent;
  padding: 2.5rem 0 2.1rem;
}
.product_nav .nav .nav_item:hover,
.product_nav .nav .nav_item.active {
  border-bottom-color: var(--primary);
}
.product_show {
  background-image: linear-gradient(to bottom, transparent 6.2%, #f8f8f8 42.2%, #eeeeee 66%);
  padding: 6.1rem 0 8.3rem;
}
.product_show .swiper_box {
  width: 50%;
}
.product_show .swiper_box > div {
  position: static;
}
.product_show .swiper_box + .head {
  position: relative;
  z-index: 2;
  max-width: 58.2rem;
}
.product_show .product_show_gallery_swiper {
  margin: 0 -17.08333333% 0 -2.36111111%;
  overflow: hidden;
}
.product_show .product_show_gallery_swiper .img {
  display: block;
  padding-bottom: 61.74418605%;
}
.product_show .product_show_thumbs_swiper {
  overflow: hidden;
  max-width: 54.4rem;
  padding: 2px;
  margin: 4rem auto 0;
  border-radius: 0.8rem;
}
.product_show .product_show_thumbs_swiper .swiper-slide {
  position: relative;
  border: 1px solid #bbbbbb;
  background-color: #fff;
  border-radius: 0.8rem;
  cursor: pointer;
  max-width: 123px;
}
.product_show .product_show_thumbs_swiper .swiper-slide::after {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  content: '';
  width: calc(100% - 2px);
  height: calc(100% - 2px);
  border-radius: 0.8rem;
  border: 2px solid var(--primary);
  transition: all 0.3s;
  opacity: 0;
  pointer-events: none;
}
.product_show .product_show_thumbs_swiper .swiper-slide-thumb-active::after {
  opacity: 1;
}
.product_show .product_show_thumbs_swiper .img {
  padding-bottom: 61.66666667%;
  overflow: hidden;
}
.product_show .product_show_thumbs_swiper .img:hover img {
  transform: scale(1.1);
}
.product_show .head {
  flex: 1;
  width: 100%;
  padding-bottom: 0.7%;
}
.product_show .head h1 {
  font-size: 4.8rem;
  letter-spacing: 0.095rem;
}
.product_show .head strong {
  display: block;
  font-size: 2.5rem;
  font-weight: 500;
  margin-top: 1.5rem;
  letter-spacing: 0.03rem;
}
.product_show .head p {
  color: rgba(23, 23, 23, 0.85);
  margin-top: 3.3rem;
}
.product_show .head ul {
  font-size: 1.8rem;
  font-weight: 700;
  margin-top: 2.5rem;
}
.product_show .head ul li + li {
  margin-top: 0.9em;
}
.product_show .head ul li {
  position: relative;
  padding-left: 1.5em;
}
.product_show .head ul li::before {
  position: absolute;
  content: '';
  width: 0.889em;
  height: 0.889em;
  left: 0;
  top: 0.1em;
  background: url("../img/gou.svg") no-repeat center / contain;
}
.product_show .btns {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 6rem;
  gap: 4rem;
}
.product_show .btns .btn_video {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-size: 1.8rem;
  font-weight: 700;
  gap: 1.4rem;
  --w: 4.3rem;
}
.product_show .btns .btn_video::before,
.product_show .btns .btn_video::after {
  display: inline-block;
  width: var(--w);
  height: var(--w);
  content: '';
  transition: all 0.3s;
}
.product_show .btns .btn_video::before {
  border-radius: 50%;
  border: 1px solid rgba(35, 35, 35, 0.5);
}
.product_show .btns .btn_video::after {
  position: absolute;
  left: 1px;
  top: 50%;
  transform: translateY(-50%);
  background: url("../img/play-b.svg") no-repeat left 55% center / 25.6%;
}
.product_show .btns .btn_video:hover {
  color: var(--primary);
}
.product_show .btns .btn_video:hover::before {
  border-color: var(--primary);
  background-color: var(--primary);
}
.product_show .btns .btn_video:hover::after {
  filter: contrast(0) brightness(2);
}
.product_show .btn {
  font-size: 1.8rem;
  min-width: 21.7rem;
}
.product_faq {
  padding: 4.6rem 0 15.3rem;
}
.product_faq .faqs {
  margin-top: 7.1rem;
}
.product_faq p.center:has(.btn_line) {
  margin-top: 4.4rem;
  min-height: 6.3rem;
}
.product_faq p.center:has(.btn_line) .btn_line {
  min-width: 20.1rem;
}
@media screen and (max-width: 768px) {
  .product_nav {
    top: 64px;
  }
  .product_nav.opt {
    top: 64px;
  }
  .product_nav .flex {
    gap: 0 20px;
  }
  .product_nav .title {
    font-size: 14px;
    letter-spacing: unset;
    padding: 10px 0;
  }
  .product_nav .nav .nav_list {
    width: calc(100% + 40px);
    margin: 0 -20px 0;
    padding: 0 20px;
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 20px;
  }
  .product_nav .nav .nav_list::-webkit-scrollbar {
    display: none;
  }
  .product_nav .nav .nav_item {
    font-size: 14px;
    padding: 10px 0;
    border-bottom-width: 2px;
  }
  .product_show {
    padding: 30px 0 50px;
  }
  .product_show .product_show_gallery_swiper {
    margin: 0;
  }
  .product_show .product_show_thumbs_swiper {
    margin-top: 14px;
  }
  .product_show .product_show_thumbs_swiper .swiper-slide {
    max-width: 78px;
  }
  .product_show .head {
    padding: 0;
  }
  .product_show .head h1 {
    font-size: 25px;
    letter-spacing: unset;
  }
  .product_show .head strong {
    font-size: 18px;
    margin-top: 10px;
    letter-spacing: unset;
  }
  .product_show .head p {
    margin-top: 12px;
  }
  .product_show .head ul {
    font-size: 14px;
    margin-top: 12px;
  }
  .product_show .btns {
    margin-top: 20px;
    gap: 14px;
  }
  .product_show .btns .btn {
    margin: 0;
  }
  .product_show .btns .btn_video {
    font-size: 14px;
    gap: 12px;
    --w: 32px;
  }
  .product_faq {
    padding: 50px 0;
  }
  .product_faq .faqs {
    margin-top: 30px;
  }
  .product_faq p.center:has(.btn_line) {
    margin-top: 40px;
    min-height: 42px;
  }
  .product_faq p.center:has(.btn_line) .btn_line {
    min-width: 120px;
  }
}
@media screen and (max-width: 576px) {
  .product_show .swiper_box {
    width: 100%;
  }
}