* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  font-family: source-han-serif-japanese, serif;
  letter-spacing: 0.08rem;
  background: #ffffff;
  color: #333;
}

li {
  list-style: none;
}

a {
  text-decoration: none;
  color: #333;
}

img,
video {
  object-fit: cover;
}

:root {
  --accent-color: #c4291c;
  --secondary-color: #faf7f2;
  --border-color: #afacac;
}

.container,
.feature_video_container {
  width: 80%;
  max-width: 1100px;
  margin: auto;
}

.link_hover {
  transition: color 0.1s ease-in-out;
}

.link_hover:hover {
  color: rgba(51, 51, 51, 60%);
}

.btn {
  font-family: noto-sans, sans-serif;
  letter-spacing: 0.02rem;
  font-weight: bold;
  display: flex;
  justify-content: center;
}

.btn_dot {
  position: relative;
  padding-left: 1rem;
}

.btn_dot:before {
  content: "";
  width: 0.3rem;
  height: 0.3rem;
  border-radius: 50%;
  background: var(--accent-color);
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  transition: all 0.3s ease-in-out;
}

.btn_dot:hover:before {
  transform: translateY(-50%), scale(1);
  border: solid 1px #333;
  background: #ffffff;
}

/* ----------     sticky nav     ---------- */
header {
  background: #ffffff;
  height: 6.25rem;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
}

#header_container {
  width: 100%;
  height: 100%;
  max-width: 1300px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
}

#logo {
  height: 70%;
  position: relative;
}

#logo img {
  height: 100%;
}

nav {
  height: 6.25rem;
}

nav > ul {
  display: flex;
}

nav > ul > li {
  margin-left: 3.5rem;
}

.nl_box {
  font-size: 1.25rem;
  line-height: 6.25rem;
}

.nl_box:hover {
  cursor: pointer;
}

#wu_nl,
#ini_nl {
  position: relative;
}

.nav_dot:after {
  content: "";
  width: 0.3rem;
  height: 0.3rem;
  border-radius: 50%;
  background: var(--accent-color);
  position: absolute;
  bottom: 25%;
  left: 50%;
  transform: translateX(-50%);
  transition: all 0.3s ease-in-out;
}

#wu_nl:hover .nav_dot:after,
#ini_nl:hover .nav_dot:after {
  transform: translateX(-50%), scale(1);
  border: solid 1px #333333;
  background: #ffffff;
}

.nav_dropdown {
  word-break: keep-all;
  font-family: noto-sans, sans-serif;
  font-weight: 600;
  height: 0;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 10px 25px 0 rgba(51, 51, 51, 0.5);
  text-align: center;
  position: absolute;
  top: 6.25rem;
  left: 50%;
  transform: translateX(-50%);
  transition: height 0.3s ease-in-out;
}

#wu_nl:hover .wu_nd {
  height: 16rem;
  transition: height 0.3s ease-in-out 0.2s;
}

#ini_nl:hover .ini_nd {
  height: 10rem;
  transition: height 0.3s ease-in-out 0.2s;
}

.wu_nd ul {
  margin: 2rem;
}

.ini_nd ul {
  margin: 2.5rem 3.5rem;
}

.nav_dropdown li {
  margin: 1.8rem 0rem;
}

.mrg_left {
  margin-left: 0.6rem;
}

.dd_hover {
  transition: all 0.2s ease-in-out;
}

.dd_hover:hover {
  color: var(--accent-color);
}

.nv_lecture {
  color: rgba(51, 51, 51, 0.5);
}

#hamburger_menu {
  display: none;
}

/*      title      */
#feature_contents {
  margin: 12rem 0;
}

#feature_contents p {
  font-family: noto-sans, sans-serif;
  text-align: justify;
  font-size: 1rem;
  font-weight: 300;
  line-height: 2rem;
}

#feature_title {
  padding-left: 2rem;
  position: relative;
  margin-bottom: 5rem;
}

#feature_title:before {
  content: "";
  width: 3px;
  height: 100%;
  background: var(--accent-color);
  position: absolute;
  top: 0;
  left: 0;
}

.ios_title:before {
  height: 53% !important;
}

#title_wrapper {
  overflow: hidden;
}

#feature_title h1 {
  font-family: minion-pro, serif;
  font-weight: normal;
  font-size: 3.5em;
  line-height: 3.5rem;
  margin-bottom: 3rem;

  transform: matrix(1, 0, 0, 1, 0, 100);
  animation: fadeup 1.2s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.ios_title {
  overflow: hidden;
  margin-bottom: 3rem !important;
}

@keyframes fadeup {
  0% {
    transform: matrix(1, 0, 0, 1, 0, 100);
  }
  100% {
    transform: matrix(1, 0, 0, 1, 0, 0);
  }
}

.subtitle {
  text-align: center;
}

.subtitle h2 {
  color: var(--accent-color);
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.subtitle h3 {
  font-family: minion-pro, serif;
  font-weight: normal;
  font-size: 2.5rem;
}

/*      photos & video      */
.feature_photos {
  margin-bottom: 2.5rem;
}

.feature_photos ul {
  display: flex;
  justify-content: space-between;
}

.feature_photos li {
  width: 32%;
  overflow: hidden;
}

.zoomout_img {
  width: 100%;
  height: 100%;
  object-position: center;

  opacity: 0;
  transform: scale(1.2);
}

.zoomout {
  animation: zoomout 0.8s cubic-bezier(0.58, 0.21, 0.91, 0.68) forwards;
}

@keyframes zoomout {
  from {
    opacity: 0;
    transform: scale(1.2);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.feature_photos li:nth-child(2) img {
  animation-delay: 0.2s;
}

.feature_photos li:nth-child(3) img {
  animation-delay: 0.4s;
}

.feature_video_container {
  margin-top: 4rem;
}

.feature_video_container video {
  width: 100%;
}

/* ----------     cadcam     ---------- */
.cad_process {
  padding: 5rem 0;
}

.cad_subtitle {
  display: flex;
  align-items: center;

  position: relative;
}

.cad_subtitle::before {
  font-family: noto-sans, sans-serif;
  font-size: 10em;
  font-weight: bold;
  line-height: 7rem;
  color: rgba(196, 41, 28, 0.2);

  position: relative;
  z-index: -1;
  left: -2.5rem;
  bottom: 0;
}

.st {
  font-family: source-han-serif-japanese, serif;
  font-size: 1.5rem;

  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.st1::before {
  content: "01";
}

.st2::before {
  content: "02";
}

.st3::before {
  content: "03";
}

.st3 h2 {
  padding: 0 1.5rem;
}

.milling {
  position: relative;
}

.milling:before,
.milling:after {
  content: "";
  width: 100%;
  height: 1px;
  background: var(--border-color);

  position: absolute;
  left: 0;
}

.milling:before {
  top: 0;
}

.milling:after {
  bottom: 0;
}

/* ----------     IOS     ---------- */
.ios_contents {
  margin-top: 6.5rem;
}

.maker {
  background: var(--secondary-color);
  border-radius: 20px;
  margin-top: 0rem;
}

#maker_container {
  padding: 3rem 5rem;
}

#maker_title {
  font-size: 1.2rem;
  text-align: center;
}

#maker_list {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.scanner_name {
  margin: 1rem 2.5rem 0 2.5rem;
}

#process_container h4 {
  font-family: minion-pro, serif;
  color: var(--border-color);
  font-size: 5rem;
  line-height: 5rem;
}

#clinic {
  margin-top: 2rem;
}

.ios_process {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.process_contents {
  width: 45%;
  margin-top: 1rem;
}

.process_texts {
  display: flex;
  align-items: center;
}

.process_numbers {
  font-family: noto-sans, sans-serif;
  font-size: 3.5em;
  font-weight: 600;
  color: rgba(196, 41, 28, 0.3);

  padding-right: 1.5rem;
}

.process_texts p {
  line-height: 1.5rem !important;
}

.process_imgbox {
  width: 100%;
  height: 25rem;
  overflow: hidden;
}

.ios_process li:nth-child(even) img {
  animation-delay: 0.2s;
}

#lab {
  margin-top: 4rem;
}

.implant_subtitle {
  text-align: left;
  margin-bottom: 3rem;
}

/* ↓インプラント模型写真ができたら以下使用 */
/* .implant {
  position: relative;
}

.implant_subtitle {
  text-align: left;
  margin-bottom: 5rem;
}

#implant_contents {
  display: flex;
  justify-content: space-between;
}

#implant_contents p,
#implant_imgbox {
  width: 45%;
}

#implant_imgbox {
  height: 16.25rem;
  position: absolute;
  bottom: 0;
  right: 0;

  overflow: hidden;
} */

/* ----------     work experience     ---------- */
#we_title {
  padding-left: 2rem;
  position: relative;
  margin-bottom: 5rem;

  overflow: hidden;
}

#we_title:before {
  content: "";
  width: 3px;
  height: 100%;
  background: var(--accent-color);
  position: absolute;
  top: 0;
  left: 0;
}

#we_jpns_title {
  font-weight: normal;
  font-size: 1.2em;
  letter-spacing: 0.2rem;
  margin-bottom: 0.5rem;
}

#we_eng_title {
  font-family: minion-pro, serif;
  font-weight: normal;
  font-size: 3.5em;
  line-height: 3.5rem;
  margin-bottom: 2.5rem;
}

#we_jpns_title,
#we_eng_title {
  transform: matrix(1, 0, 0, 1, 0, 100);
  animation: fadeup 1.2s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

#we_contents_container {
  display: flex;
  justify-content: space-between;

  margin-top: 10rem;
}

#we_contents_imgbox {
  width: 45%;
  height: 18rem;
  margin-top: auto;
  overflow: hidden;
}

#we_contents_texts {
  width: 45%;
}

#we_contents_imgbox img {
  width: 100%;
  height: 100%;
  object-position: top;

  opacity: 0;
  transform: scale(1.5);
}

.we_contents_subtitle {
  text-align: left;
  margin-bottom: 4rem;
}

#comments_container {
  margin-top: 10rem;
}

#we_gallery {
  margin: 8rem auto 0;
  max-width: 1800px;
  height: 169rem;
  position: relative;
  overflow-x: hidden;
}

#comments {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

.commentbox {
  background: var(--secondary-color);
  padding: 3rem;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.comment1 {
  width: 28rem;
  border-radius: 61% 39% 84% 16% / 36% 57% 43% 64%;
  margin-top: 8%;
}

.comment2 {
  width: 36rem;
  border-radius: 50% 50% 50% 70%/50% 50% 70% 60%;
  margin-top: 10rem;
  right: -50%;
}

.comment3 {
  width: 33rem;
  border-radius: 38% 62% 32% 68% / 62% 57% 43% 38%;
  margin-top: 15rem;
  right: 50%;
}

.comment4 {
  width: 24rem;
  border-radius: 60% 40% 50% 50% / 48% 61% 39% 52%;
  margin-top: 5rem;
  left: 90%;
}

.comment5 {
  width: 38rem;
  border-radius: 46% 54% 81% 19% / 27% 61% 39% 73%;
  margin-top: 15rem;
  right: 50%;
}

.comment6 {
  width: 31rem;
  border-radius: 46% 54% 81% 19% / 71% 61% 39% 29%;
  margin-top: 8rem;
  left: 40%;
}

.comment7 {
  width: 20rem;
  border-radius: 63% 37% 84% 16% / 37% 61% 39% 63%;
  margin-top: 25rem;
  left: 100%;
}

#we_photos {
  position: relative;
}

.mediaframe {
  position: absolute;
  overflow: hidden;
}

.para_img,
.mediaframe video {
  width: 100%;
}

.imgbox1 {
  width: 25%;
  top: 0;
  right: 0;
}

.imgbox2 {
  width: 20%;
  top: 8.75rem;
  left: 4%;
}

.vid1 {
  width: 30%;
  top: 28rem;
  left: 10%;
}

.imgbox3 {
  width: 22%;
  top: 42rem;
  right: 5%;
}

.imgbox4 {
  width: 26%;
  top: 50rem;
  right: 25%;
}

.imgbox5 {
  width: 25%;
  top: 70rem;
  left: 15%;
}

.vid2 {
  width: 30%;
  top: 86rem;
  right: 12%;
}

.imgbox6 {
  width: 28%;
  top: 112rem;
  left: 0;
}

.imgbox7 {
  width: 20%;
  top: 130rem;
  right: 18%;
}

.vid3 {
  width: 34%;
  top: 140rem;
  left: 15%;
}

.pls_contact {
  font-family: noto-sans, sans-serif;
  font-weight: bold;
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  line-height: 2rem;
  text-align: center;

  -webkit-font-smoothing: antialiased;
}

/* ----------     link     ---------- */
#feature_links {
  letter-spacing: 0.2rem;
  display: flex;
  height: 31rem;
}

#nextpage_link {
  width: 60%;
  position: relative;
  overflow: hidden;
}

#nextpage_link:after {
  content: "";
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background: rgba(51, 51, 51, 0.4);
  opacity: 0;
  transition: all 0.3s ease-in-out;
}

#nextpage_link:hover:after {
  opacity: 1;
}

.printer_linkImg {
  object-position: 30% 40%;
}

.ios_linkImg {
  object-position: 50% 25%;
}

.shade_linkImg {
  object-position: 30% 75%;
}

#np_container {
  width: 75%;
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  color: #ffffff;
}

#np_intro {
  font-size: 2rem;
  font-weight: bold;
}

#un_texts {
  margin-top: 10rem;
}

#up_next {
  font-family: noto-sans, sans-serif;
  font-weight: bold;
  font-size: 1.25rem;
}

#hover_arrow {
  display: flex;
  align-items: center;
  margin-top: 1rem;
}

#un_title {
  font-family: minion-pro, serif;
  font-weight: normal;
  font-size: 3rem;
  margin-right: 1.5rem;
  transition: margin-right 0.3s ease-in-out;
}

.fa-arrow-right-long {
  font-size: 2rem;
}

#nextpage_link:hover #un_title {
  margin-right: 2.5rem;
}

#feature_linklists {
  width: 40%;
  background: var(--secondary-color);
}

#fl_container {
  font-size: 2.5rem;
  height: 100%;
  display: flex;
  align-items: center;
}

#fl_container li {
  font-family: minion-pro, serif;
  padding: 1rem 0;
  margin-left: 6rem;
}

#current_page {
  color: var(--border-color);
  padding-left: 2rem;
  position: relative;
}

#current_page::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--border-color);
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.active_dot {
  padding-left: 2rem;
}

.active_dot::before {
  width: 0.5rem;
  height: 0.5rem;
}

/* ----------    contact     ---------- */
#contact {
  background: #ffffff;
  padding: 6rem 0;
  margin: 0;
  border-top: solid 1px var(--border-color);
}

.contact_container {
  display: flex;
  align-items: stretch;
}

.contact_el {
  width: 100%;
}

.contact_intro {
  padding: 1rem 6rem 1rem 0;
}

#contact_br {
  display: none;
}

#contact_title {
  padding-bottom: 4rem;
}

#contact_title > .jpns_title {
  color: var(--accent-color);
  font-size: 0.9em;
  margin-bottom: 1rem;
}

#contact_title > .eng_title {
  font-size: 3em;
  font-weight: normal;
  line-height: 1em;
}

#contact_texts {
  font-family: noto-sans, sans-serif;
  font-weight: 300;
  line-height: 2rem;
}

.contact_info {
  text-align: center;
  position: relative;
}

.contact_info:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: var(--border-color);
}

.ci_container {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact_btn,
#phone_number {
  padding-top: 3rem;
}

.contact_icon p {
  padding-top: 1.5rem;
}

/* ----------     footer     ---------- */
footer {
  background: #333333;
  color: #ffffff;
  padding: 4rem 0;
}

.footer_container {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

#footer_info p {
  line-height: 2rem;
}

#brains {
  font-weight: bold;
  letter-spacing: 0.15rem;
  padding-bottom: 1.8rem;
}

.sns_icons ul {
  display: flex;
  justify-content: space-around;
}

.sns_icons i {
  color: #ffffff;
  transition: color 0.3s ease-in-out;
}

.sns_icons p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  padding-top: 1rem;
}

.sns_icons .yt_icon:hover {
  color: #da1725;
}

.insta_icon:hover {
  color: #cf2e92;
}

.fb_icon:hover {
  color: #1877f2;
}