@charset "utf-8";
/* ================================================
   共通ルール
   ================================================ */
*, *::before, *::after {
  box-sizing: border-box;
}
html {
  scroll-padding-top: 80px;
  font-family: "Noto Serif JP", serif;
  scroll-behavior: smooth;
}
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}
.container-padding {
  padding: 78px 0 100px;
}
.bg-color-base {
  background-color: #f2f2e8;
}
.bg-color-dark {
  background-color: #9e9a9a;
}
.bg-color-light {
  background-color: #fff;
}
.section-title {
  color: #222;
  font-size: clamp(1.625rem, 4vw, 2.5rem);
  font-weight: 600;
  text-align: center;
  margin-bottom: clamp(2.1875rem, 5vw, 4.375rem);
}
.text-base {
  font-size: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
  line-height: 1.388; /* 25px ÷ 18px ≒ 1.388 */
  color: #4b4b4b;
  hyphens: auto;
  word-break: normal;
}
@media (max-width: 1279px) {
  .container-padding {
    padding: 50px 10px 80px;
  }
}
@media (max-width: 768px) {
  html {
    scroll-padding-top: 65px;
  }
}
/* ================================================
   Header　セクション
   ================================================ */
.site-header {
  width: 100%;
  background: #fff;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 20px 20px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.header-logo img {
  height: 50px;
  width: auto;
  display: block;
}
.header-nav-group {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 20px;
}
.lang-list {
  display: flex;
  gap: 6px;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
}
.lang-link {
  display: inline-block;
  color: #222;
  opacity: 0.45;
  transition: opacity 0.2s ease;
}
.lang-link:hover {
  opacity: 1;
}
.lang-item:not(:last-child)::after {
  content: "/";
  margin-left: 9px;
  color: #222;
}
.lang-link.is-active {
  opacity: 1;
  font-weight: 600;
  pointer-events: none;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-link {
  color: #222;
  font-size: 1rem;
  letter-spacing: 0.1em;
  position: relative;
  padding-bottom: 10px;
  transition: color 0.3s;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background-color: #f73737;
  opacity: 0;
  transform: translateY(6px);
  transition: all 0.3s ease;
}
.nav-link:hover::after {
  opacity: 1;
  transform: translateY(0);
}
@media (max-width: 768px) {
  .header-logo img {
    height: 36px;
  }
}
/* ================================================
   ハンバーガーメニュー　　
   ================================================ */
.hamburger-btn {
  display: none;
}
@media (max-width: 1024px) {
  .hamburger-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    z-index: 2000;
    transform: translateY(10px);
  }
  .hamburger-line-wrap {
    display: block;
    position: relative;
    width: 24px;
    height: 10px;
  }
  .hamburger-line {
    display: block;
    position: absolute;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: #222 !important;
    transition: transform 0.3s ease, top 0.3s ease, opacity 0.3s ease;
  }
  .hamburger-line:nth-child(1) {
    top: 0;
  }
  .hamburger-line:nth-child(2) {
    top: 9px;
  }
  .hamburger-text {
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: #222;
    text-transform: uppercase;
    transition: opacity 0.3s;
  }
  .is-open .hamburger-line:nth-child(1) {
    top: 5px;
    transform: rotate(45deg);
  }
  .is-open .hamburger-line:nth-child(2) {
    top: 5px;
    transform: rotate(-45deg);
  }
  .is-open .hamburger-text {
    opacity: 0;
  }
  .header-nav-group {
    position: fixed;
    top: 0;
    right: 0;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: #fff;
    padding: 100px 40px 40px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 40px;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.05);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    z-index: 1900;
  }
  .is-open .header-nav-group {
    transform: translateX(0);
  }
  .lang-list {
    flex-direction: row;
    align-items: center;
    gap: 20px;
    width: auto;
  }
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    width: 100%;
  }
  .nav-link {
    font-size: 1.25rem;
    display: block;
    width: 100%;
    padding-bottom: 8px;
    border-bottom: 1px solid #f2f2e8;
  }
  .nav-link::after {
    display: none;
  }
}
/* ================================================
   Footer　セクション　
   ================================================ */
.site-footer {
  background-color: #42474e;
  padding-top: 40px;
  padding-bottom: 60px;
}
.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.footer-logo {
  margin-bottom: 35px;
}
.footer-logo a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  transition: opacity 0.3s ease;
}
.footer-logo a:hover {
  opacity: 0.75;
}
.footer-logo-img {
  display: block;
  max-width: 168px;
  width: clamp(124px, 104px + 5vw, 168px);
  height: auto;
}
.footer-logo-text {
  color: #fff;
  font-size: 1rem;
  font-weight: 500;
}
.footer-address {
  color: #ffffff;
  font-style: normal;
  font-size: 0.9375rem;
  line-height: 1.8;
  letter-spacing: 0.02em;
  margin-bottom: 35px;
}
.br-footer {
  display: none;
}
.footer-copyright {
  width: 100%;
}
.footer-copyright small {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}
@media (max-width: 768px) {
  .site-footer {
    padding-top: 40px;
    padding-bottom: 30px;
  }
  .footer-address {
    font-size: 0.875rem;
    line-height: 1.7;
    padding-left: 10px;
    padding-right: 10px;
    margin-bottom: 20px;
  }
}
@media (max-width: 459px) {
  .br-footer {
    display: block;
  }
}
/* ================================================
   ページトップボタン
   ================================================ */
.page-top-btn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 999;
  width: 50px;
  height: 50px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  transform: translateY(20px);
}
.page-top-btn img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.page-top-btn.is-show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.page-top-btn:hover {
  opacity: 0.8;
}
/* ================================================
   Main Visual　セクション
   ================================================ */
.mv-section {
  padding-top: 94px;
  background-color: #f2f2e8;
  width: 100%;
}
.mv-container {
  max-width: 1280px;
  width: 100%;
  height: 596px;
  margin: 0 auto;
  background-color: #fff;
  background-image: url("../image/mv-waveform.jpg");
  background-repeat: no-repeat;
  background-position: center bottom;
  background-size: cover;
  position: relative;
}
.mv-lead-area {
  position: absolute;
  left: 50%;
  bottom: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1280px;
  text-align: center;
}
.mv-lead {
  position: relative;
  color: #fff;
  font-size: clamp(1.125rem, 5vw - 1rem, 1.875rem);
  text-align: center;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  line-height: 1.45;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
  word-break: keep-all;
  overflow-wrap: break-word;
  padding: 0 !important;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  z-index: 1;
}
.mv-lead::before {
  content: "";
  position: absolute;
  top: -30px;
  bottom: -30px;
  left: -60px;
  right: -60px;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.25) 55%, rgba(0, 0, 0, 0) 85%);
  filter: blur(25px);
}
.mv-br {
  display: none;
}
@media (max-width: 1279px) {
  .mv-container {
    height: auto;
    aspect-ratio: 1280 / 596;
    background-size: cover;
  }
  .mv-lead {
    font-size: clamp(1.125rem, 5.8vw - 2.65rem, 1.875rem);
  }
}
@media (max-width: 1100px) {
  .mv-br {
    display: block;
  }
  .mv-lead-area {
    transform: translateX(-50%) translateY(28px);
  }
  .mv-lead {
    max-width: 600px;
    font-size: clamp(1.125rem, 4vw - 0.5rem, 1.625rem);
  }
}
@media (max-width: 768px) {
  .mv-section {
    padding-top: 80px;
  }
  .mv-lead-area {
    padding: 0 20px 6px;
  }
}
/* ================================================
   Mission　セクション
   ================================================ */
.mission-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin: 0 auto;
}
.mission-figure, .mission-text {
  flex: 0 0 50%;
}
.mission-figure {
  display: flex;
  justify-content: flex-end;
}
.mission-figure img {
  display: block;
  width: 425px;
  max-width: 100%;
  height: auto;
  padding-right: 40px;
}
.mission-text p {
  max-width: 412px;
  width: 100%;
}
@media (max-width: 768px) {
  .mission-content {
    flex-direction: column;
    gap: 30px;
  }
  .mission-figure, .mission-text {
    flex: 0 0 100%;
  }
  .mission-figure img {
    padding-right: 0;
  }
  .mission-text {
    padding-left: 0;
  }
  .mission-text p {
    max-width: 100%;
  }
}
/* ================================================
   Activity　セクション
   ================================================ */
.activity-container-padding {
  padding: 90px 0 107px;
}
.activity-content {
  display: flex;
  flex-direction: column;
}
.activity-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.activity-item:nth-child(even) {
  flex-direction: row-reverse;
}
.activity-image, .activity-text {
  flex: 0 0 50%;
}
.activity-image {
  position: relative;
  line-height: 0;
  overflow: hidden;
}
.activity-image img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.activity-image::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1;
}
.activity-image .activity-title {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  width: 90%;
  height: auto !important;
  line-height: 1.5 !important;
  color: #ffffff;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.08em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}
.activity-title {
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
}
.br-activity {
  display: none;
}
.activity-text {
  padding: 0 30px;
}
.activity-text p {
  padding-bottom: 25px;
}
@media (max-width: 1279px) {
  .activity-container-padding {
    padding: 58px 0 69px;
  }
  .activity-item {
    flex-direction: column !important;
    gap: 24px;
    margin-bottom: 60px;
    padding: 0 20px;
  }
  .activity-item:nth-child(even) {
    flex-direction: column !important;
  }
  .activity-img, .activity-txt {
    width: 100%;
  }
  .activity-title {
    font-size: clamp(1.375rem, 1.1rem + 1.2vw, 2.0rem);
  }
  .activity-text {
    padding: 0 20px;
  }
}
@media (max-width: 768px) {
  .activity-container-padding {
    padding: 58px 0 40px;
  }
  .activity-item {
    margin-bottom: 20px;
    padding: 0;
  }
  .activity-image .activity-title {
    word-break: keep-all;
    overflow-wrap: break-word;
    height: auto !important;
  }
  .br-activity {
    display: block;
  }
  .activity-text {
    padding: 0 10px;
  }
  .activity-text p {
    padding-bottom: 20px;
  }
}
/* ================================================
   Excellence　セクション
   ================================================ */
.excellence-lead {
  max-width: 730px;
  width: 100%;
  margin: 0 auto 80px;
  text-align: left;
}
.excellence-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  max-width: 500px;
  width: 100%;
  margin: 0 auto;
}
.excellence-media-box {
  flex: 0 0 calc(50% - 20px);
}
.excellence-media-box img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.youtube-vertical {
  max-width: 360px;
  width: 100%;
  margin: 0 auto;
}
.youtube-vertical iframe {
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 16;
  display: block;
}
.youtube-container {
  max-width: 222px;
  width: 100%;
  margin: 0 auto;
}
.youtube-frame-mask {
  position: relative;
  width: 100%;
  aspect-ratio: 222 / 295;
  overflow: hidden;
  transition: aspect-ratio 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}
.youtube-frame-mask.is-expanded {
  aspect-ratio: 9 /16;
}
.youtube-frame-mask iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 16;
}
.youtube-frame-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.2);
  cursor: pointer;
  z-index: 2;
  transition: background-color 0.3s ease;
}
.youtube-frame-overlay:hover {
  background-color: rgba(0, 0, 0, 0.05);
}
.youtube-frame-mask.is-expanded .youtube-frame-overlay {
  opacity: 0;
  pointer-events: none;
}
@media (max-width: 768px) {
  .excellence-lead {
    margin-bottom: 40px;
    text-align: left;
  }
  .excellence-content {
    flex-direction: column;
    gap: 32px;
    max-width: 100%;
  }
  .excellence-media-box {
    flex: 0 0 100%;
    width: 100%;
  }
  .youtube-container {
    max-width: 80%;
  }
}
/* ================================================
   Topics　セクション
   ================================================ */
.grid-container {
  width: 100%;
  max-width: 1280px;
  margin-right: auto;
  margin-left: auto;
  padding-right: 0 !important;
  padding-left: 0 !important;
}
#topics .container-padding {
  padding-bottom: 2px !important;
}
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: #f2f2e8;
  border: 1px solid #f2f2e8;
  width: 100%;
}
.topics-item {
  display: block;
  position: relative;
  overflow: hidden;
  background-color: #f2f2e8;
  line-height: 0;
}
.topics-item img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.topics-text {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 33.33%;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  z-index: 2;
  transition: background-color 0.3s ease;
}
.topics-text span {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  text-align: center;
  color: #fff;
}
.topics-item:hover img {
  opacity: 0.85;
  transform: scale(1.03);
}
.topics-item:hover .topics-text {
  background-color: rgba(0, 0, 0, 0.75);
}
@media (max-width: 768px) {
  .topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
/* ================================================
   Overview　セクション
   ================================================ */
#overview {
  background-image: url("../image/bg.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.overview-container-padding {
  padding: 87px 0 100px;
}
.overview-card {
  max-width: 794px;
  width: 100%;
  margin: 0 auto;
  background-color: #fff;
  padding: 68px 0 60px;
}
.overview-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 50px;
}
.overview-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 40px 16px 110px;
}
.overview-label {
  font-weight: 700;
  color: #222;
  font-size: clamp(1.125rem, 0.85rem + 0.85vw, 1.375rem);
  line-height: 1.364; /* 30px ÷ 22px ≒ 1.364 */
}
.overview-value {
  color: #222;
  font-size: clamp(1.125rem, 0.85rem + 0.85vw, 1.375rem);
  line-height: 1.364; /* 30px ÷ 22px ≒ 1.364 */
}
.overview-btn-area {
  display: flex;
  justify-content: center;
  width: 100%;
}
.btn-primary {
  display: inline-block;
  background-color: #f73737;
  color: #ffffff;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 20px 43px;
  border-radius: 2px;
  cursor: pointer;
  transition: opacity 0.3s ease, transform 0.2s ease;
  text-align: center;
  line-height: 1.5;
}
.btn-primary:hover {
  opacity: 0.8;
  transform: translateY(1.5px);
}
.br-btn-overview {
  display: none;
}
@media (max-width: 810px) {
  .overview-container-padding {
    padding: 55px 20px 60px;
  }
}
@media (max-width: 768px) {
  .overview-card {
    padding: 40px 0 35px;
  }
  .overview-card .section-title {
    margin-bottom: 40px;
  }
  .overview-list {
    gap: 14px;
    margin-bottom: 20px;
  }
  .overview-item {
    padding-left: 15px;
  }
}
@media (max-width: 519px) {
  .overview-btn-area {
    margin-top: 30px;
  }
  .btn-primary {
    padding: 15px 38px;
  }
  .br-btn-overview {
    display: block;
  }
}
/* ================================================
   Contact　セクション
   ================================================ */
#contact .section-title {
  margin-bottom: 40px;
}
.contact-lead {
  max-width: 360px;
  width: 100%;
  margin: 0 auto 40px;
  font-size: clamp(1.125rem, 0.85rem + 0.85vw, 1.375rem);
  text-align: left;
  line-height: 1.5;
  color: #222;
}
.contact-form {
  max-width: 412px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}
.form-item {
  margin-bottom: 28px;
}
.contact-form input[type="text"], .contact-form input[type="email"], .contact-form textarea {
  width: 100%;
  padding: 23px 20px;
  border: 1px solid #777;
  background-color: #fff;
  font-family: inherit;
  font-size: 1.125rem;
  font-weight: 200;
  color: #222;
  transition: all 0.3s ease;
}
.contact-form textarea {
  height: 223px;
  resize: vertical;
}
.contact-form ::placeholder {
  color: #222;
  opacity: 1;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none;
  border-color: #222;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.05);
}
.form-btn-area {
  margin-top: 30px;
  text-align: center;
}
.form-submit-btn {
  display: inline-block;
  padding: 20px 58px;
  background-color: #f73737;
  color: #ffffff;
  font-family: inherit;
  font-size: 1.125rem;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: opacity 0.3s ease, transform 0.2s ease;
}
.form-submit-btn:hover {
  opacity: 0.8;
  transform: translateY(1.5px);
}
@media (max-width: 768px) {
  #contact .section-title {
    margin-bottom: 30px;
  }
  .contact-lead, .contact-form {
    max-width: 100%;
  }
  .contact-lead {
    margin-bottom: 30px;
    padding-right: 10px;
    padding-left: 10px;
    text-align: center;
  }
  .form-item {
    margin-bottom: 16px;
  }
  .form-btn-area {
    margin-top: 20px;
  }
}
/* ================================================
   Partnership
   ================================================ */
.excellence-padding {
  padding-top: 110px;
}
.excellence-lead h3 {
  margin: 40px 0 30px;
  color: #222;
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
}
@media (max-width: 768px) {
  .excellence-padding {
    padding-top: 95px;
  }
  .excellence-lead h3 {
    margin: 25px 0 15px;
  }
}