@charset "UTF-8";

/* ==========================================================================
   Variables
   ========================================================================== */
:root {
  /* Colors */
  --c-gold: #f5aa02;
  --c-navy: #0f172a;
  --c-white: #ffffff;
  --c-text-main: #333333;
  --c-text-white: #ffffff;

  /* Typography */
  --f-main: "游ゴシック", "Yu Gothic", "Meiryo", "Noto Sans", sans-serif;
  --f-en: "游ゴシック体", "YuGothic", "游ゴシック", "Yu Gothic", sans-serif;
  /* Spacing */
  --s-4: 0.4rem;
  --s-8: 0.8rem;
  --s-10: 1.0rem;
  --s-12: 1.2rem;
  --s-16: 1.6rem;
  --s-24: 2.4rem;
  --s-32: 3.2rem;
  --s-40: 4.0rem;
  --s-48: 4.8rem;
  --s-64: 6.4rem;
  --s-80: 8.0rem;
  --s-96: 9.6rem;
  --s-128: 12.8rem;

  /* Layout */
  --l-container-width: 1024px;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
  background-color: #fff;
}

body {
  margin: 0;
  font-family: var(--f-main);
  font-size: 1.6rem;
  line-height: 1.7;
  color: var(--c-text-main);
  background-color: #fff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

a:hover {}

h1,
h2,
h3,
h4,
p,
figure,
ul {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
}

button {
  appearance: none;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

/* ==========================================================================
   Layout
   ========================================================================== */
.l-container {
  width: 100%;
  max-width: var(--l-container-width);
  margin: 0 auto;
  padding: 60px var(--s-24);
}

/* ==========================================================================
   Animations
   ========================================================================== */
.js-scroll-trigger {
  opacity: 0;
  transition: opacity 1.5s cubic-bezier(0.33, 1, 0.68, 1);
  will-change: opacity;
}

.js-scroll-trigger.is-animated {
  opacity: 1;
}

/* ==========================================================================
   Header & First View
   ========================================================================== */

/* FV */
.p-fv {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100svh;
  min-height: 56.25vw;
  overflow: hidden;
  background-color: var(--c-navy);
  opacity: 0;
  transition: none !important;
}

.p-fv.is-loaded {
  opacity: 1;
}

.p-fv__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.p-fv__bg-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* 動画の上の黒マスク */
.p-fv__mask {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  max-width: none;
  aspect-ratio: 1920 / 1080;
  box-shadow: 0 0 0 100vmax rgba(0, 0, 0, 0.8);
  z-index: 2;
  pointer-events: none;
}

/* 動画の上に重ねるSVGオーバーレイ（中央配置） */
.p-fv__overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  max-width: none;
  height: auto;
  z-index: 3;
  pointer-events: none;
}

/* SP用の全面マスク */
.p-fv__mask--sp {
  top: 0;
  left: 0;
  transform: none;
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
  box-shadow: none;
  background-color: rgba(0, 0, 0, 0.5);
}

/* PC/SPでのFV表示切り替え */
.p-fv__bg-video--sp,
.p-fv__mask--sp {
  display: none;
}

@media screen and (max-width: 767px) {
  .p-fv {
    /* SP縦動画の最低高さを保証（1080×1920 = 幅:高さ = 1:1920/1080） */
    min-height: calc(100vw * 1920 / 1080);
  }

  .p-fv__bg-video--pc,
  .p-fv__mask--pc,
  .p-fv__overlay--pc {
    display: none;
  }

  .p-fv__bg-video--sp,
  .p-fv__mask--sp {
    display: block;
  }
}

/* Header */
.l-header {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  z-index: 10;
  background-color: transparent;
}

.l-header__inner {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding: 40px 60px;
  gap: 20px;
}

.l-header__nav-list {
  display: flex;
  gap: 30px;
  align-items: center;
}

.l-header__nav-item a {
  color: var(--c-white);
  font-family: var(--f-en);
  font-size: 1.6rem;
  font-weight: bold;
  transition: color 0.3s;
}

.l-header__nav-item a:hover {
  color: var(--c-gold);
}

.l-header__sns-link:hover img {
  animation: hover_bounce 0.5s ease both;
  backface-visibility: hidden;
}

/* PCでは非表示（固定ナビに移動） */
.l-header__logo {
  width: 460px;
  max-width: 450px;
  display: none;
}

.l-header__logo img {
  width: 100%;
  height: auto;
}

/* ==========================================================================
   PC固定ナビ
   ========================================================================== */
.l-sticky-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(10, 15, 40, 0.92);
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(-16px);
  pointer-events: none;
  transition: opacity 0.5s ease, transform 0.5s ease;
  display: none;
}

.l-sticky-header.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.l-sticky-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 40px;
  max-width: 1400px;
  margin: 0 auto;
}

.l-sticky-header__logo {
  display: block;
  width: 100%;
  max-width: 100px;
  flex-shrink: 0;
}

.l-sticky-header__logo img {
  width: 100%;
  height: auto;
}

/* 固定ナビ内のナビリンク色（白固定） */
.l-sticky-header .l-header__nav-item a {
  color: var(--c-white);
  font-size: 1.6rem;
}

.l-sticky-header .l-header__nav-item a:hover {
  color: var(--c-gold);
}

/* FV Watch Now ボタン */
.p-fv__content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 4;
}

.c-btn-watch {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 200px;
  max-width: 220px;
  min-width: 160px;
  height: 50px;
  max-height: 56px;
  min-height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  color: var(--c-white);
  font-family: var(--f-en);
  font-size: 1.6rem;
  letter-spacing: 0.1em;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  text-decoration: none;
  transition: all 0.4s ease;
}

.c-btn-watch:hover {
  animation: hover_bounce 0.5s ease both;
  backface-visibility: hidden;
}

@media screen and (min-width: 768px) {
  .l-sticky-header {
    display: block;
  }

  /* PC: Watch Nowボタンは読み込み後にJSで表示 */
  .c-btn-watch {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.8s ease;
  }

  .c-btn-watch.is-visible {
    opacity: 1;
    pointer-events: auto;
  }
}

@media screen and (max-width: 767px) {
  .l-header__logo {
    display: block;
  }

  .c-btn-watch {
    background: rgba(0, 0, 0, 0.5);
    /* ↓ iOS Safari用の指定を追加 */
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.l-footer {
  background-color: #0050A5;
  color: var(--c-text-white);
  padding: 60px var(--s-24);
  min-height: 280px;
  display: flex;
  align-items: flex-end;
}

.l-footer__inner {
  width: 100%;
}

.l-footer__copy {
  display: block;
  font-size: 1.4rem;
  font-family: var(--f-en);
  color: rgba(255, 255, 255, 0.7);
  text-align: left;
}

.ot-sdk-show-settings {
  display: block;
  width: fit-content;
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  margin-bottom: 8px;
  transition: color 0.3s, opacity 0.3s;
}

.ot-sdk-show-settings:hover {
  color: #fff;
}

@media screen and (max-width: 767px) {
  .l-footer {
    align-items: center;
    justify-content: center;
    min-height: 150px;
    padding: 40px var(--s-24);
  }

  .l-footer__copy {
    text-align: center;
  }

  .ot-sdk-show-settings {
    margin: 0 auto 12px;
  }
}

/* ==========================================================================
   Component - Heading
   ========================================================================== */
.c-heading-main {
  font-family: var(--f-en);
  font-size: 4rem;
  font-weight: bold;
  text-align: center;
  margin-bottom: 48px;
  line-height: 1.1;
  /* color: #73bfd3; */
  color: #0074E8;
}

.c-heading-main img,
.p-sns__title img,
.p-sponsors__heading img,
.p-link__heading img {
  display: block;
  margin: 0 auto;
  max-width: inherit;
  height: 44px;
  width: auto;
}

/* Conceptのみ左寄せ */
.p-concept__text-area .c-heading-main img {
  margin: 0;
}

.c-heading-main--white img {
  /* SVG自体を白にしたためフィルターは不要 */
}

@media screen and (max-width: 767px) {

  .c-heading-main img,
  .p-sns__title img,
  .p-sponsors__heading img,
  .p-link__heading img {
    height: 36px;
  }

  .p-concept__title-sp {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .p-concept__title-sp img {
    height: 36px;
    width: auto;
  }

  .p-concept__title-sp img:first-child {
    margin-bottom: 10px;
  }
}

.c-heading-main--white {
  color: var(--c-text-white);
}

.c-heading-main--blue {
  color: #0274e8;
}

.c-heading-main--center {
  text-align: center;
}

.c-heading-main__sub {
  display: block;
  font-family: var(--f-main);
  font-size: 1.6rem;
  font-weight: bold;
  margin-top: 10px;
}

@media screen and (max-width: 767px) {
  .c-heading-main__sub {
    margin-top: 5px;
  }
}

/* ==========================================================================
   Section - The Future of Jazz (Concept)
   ========================================================================== */
.p-concept {
  position: relative;
  overflow: hidden;
  color: var(--c-text-white);
}

.p-concept::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/img_index_concept_bg.jpg');
  background-image: -webkit-image-set(url('../images/img_index_concept_bg.avif') type('image/avif'),
      url('../images/img_index_concept_bg.jpg') type('image/jpeg'));
  background-image: image-set(url('../images/img_index_concept_bg.avif') type('image/avif'),
      url('../images/img_index_concept_bg.jpg') type('image/jpeg'));
  background-size: cover;
  background-position: top right;
  filter: blur(8px);
  /* ぼかしの強さ */
  transform: scale(1.1);
  /* ぼかしによる端の白抜けを防止 */
  z-index: 0;
}

.p-concept__inner {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 60px;
}

.p-concept__text-area {
  width: 48%;
}

.p-concept__text-area .c-heading-main {
  text-align: left;
  margin-bottom: 40px;
}

.p-concept__text-area .c-heading-main img {
  width: auto;
  max-width: 410px;
  margin: 0;
}

.p-concept__subtitle {
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--c-text-white);
  line-height: 1.6;
  margin-bottom: 30px;
  opacity: 0.9;
}

.p-concept__desc {
  font-size: 1.6rem;
  line-height: 1.7;
  letter-spacing: 0;
  color: var(--c-text-white);
}

.p-concept__signature {
  font-size: 1.6rem;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.4;
  margin-top: 36px;
  letter-spacing: 0.08em;
}

.p-concept__image-area {
  width: 48%;
  overflow: hidden;
}

.p-concept__image-area img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media screen and (max-width: 767px) {
  .p-concept {
    background-image: url('../images/img_index_concept_bg_sp.jpg');
    background-image: -webkit-image-set(url('../images/img_index_concept_bg_sp.avif') type('image/avif'),
        url('../images/img_index_concept_bg_sp.jpg') type('image/jpeg'));
    background-image: image-set(url('../images/img_index_concept_bg_sp.avif') type('image/avif'),
        url('../images/img_index_concept_bg_sp.jpg') type('image/jpeg'));
  }

  .p-concept__inner {
    flex-direction: column;
    gap: var(--s-48);
  }

  .p-concept__text-area {
    width: 100%;
    text-align: center;
  }

  .p-concept__text-area .c-heading-main {
    text-align: center;
    margin-bottom: 30px;
  }

  .p-concept__text-area .c-heading-main img {
    margin: 0 auto;
  }

  .p-concept__image-area {
    width: 100%;
  }
}

/* ==========================================================================
   Section - Chronology
   ========================================================================== */
.p-chronology {
  background-color: #d1cdca;
  background-image: url('../images/img_index_chronology_bg.jpg');
  background-image: -webkit-image-set(url('../images/img_index_chronology_bg.avif') type('image/avif'),
      url('../images/img_index_chronology_bg.jpg') type('image/jpeg'));
  background-image: image-set(url('../images/img_index_chronology_bg.avif') type('image/avif'),
      url('../images/img_index_chronology_bg.jpg') type('image/jpeg'));
  background-size: cover;
  background-position: top center;
  background-repeat: no-repeat;
  position: relative;
  overflow: hidden;
  /* 半円マスクに必須 - 削除禁止 */
  z-index: 10;
}

.p-chronology__arc {
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  max-width: 700px;
  aspect-ratio: 1 / 1;
  background-color: #0074E8;
  border-radius: 50%;
  z-index: 1;
}

.p-chronology .l-container {
  position: relative;
  z-index: 2;
  padding-top: 200px;
}

.p-chronology__title {
  position: absolute;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  z-index: 3;
  margin: 0;
  text-align: center;
  color: var(--c-white);
}



.p-chronology__content {
  background: linear-gradient(180deg,
      rgba(255, 255, 255, 0) 0%,
      rgba(255, 255, 255, 0.9) 15%,
      rgba(255, 255, 255, 0.9) 85%,
      rgba(255, 255, 255, 0) 100%);
  padding: 80px 10px;
}

.p-chronology__timeline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 960px;
  padding: 0 30px;
}

.p-chronology__timeline-left {
  width: 20%;
  flex-shrink: 0;
  height: 300px;
  overflow: hidden;
  position: relative;
}

.p-chronology__year-list {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.p-chronology__year {
  font-family: var(--f-en);
  font-size: 2.5rem;
  font-weight: bold;
  color: rgba(197, 160, 89, 0.4);
  padding: 0;
  margin: 0;
  line-height: 1;
  display: flex !important;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100%;
  height: 33.333% !important;
  white-space: nowrap;
  transition: all 0.3s ease;
  cursor: pointer;
}

.p-chronology__year.swiper-slide-active {
  color: rgba(197, 160, 89, 1);
  font-size: 3rem;
}

.p-chronology__timeline-right {
  width: 65%;
  flex-shrink: 0;
  min-width: 0;
  overflow: hidden;
}

.p-chronology__figure {
  width: 100%;
  max-width: 800px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: var(--s-24);
}

.p-chronology__figure img {
  width: 100%;
  object-fit: cover;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.p-chronology__text {
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--c-text-main);
  line-height: 1.7;
  margin-top: 30px;
}

.p-chronology__data {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px 0;
  margin-top: 24px;
  font-size: 1.6rem;
  line-height: 1.6;
  color: var(--c-text-main);
}

.p-chronology__data dt {
  font-weight: 700;
  align-self: start;
}

.p-chronology__data dd {
  margin: 0 0 12px 0;
  align-self: start;
}

.p-chronology__data dd:last-child {
  margin-bottom: 0;
}

@media screen and (max-width: 767px) {

  .p-chronology__arc {
    width: 375px;
    max-width: none;
    aspect-ratio: auto;
    height: 375px;
  }

  .p-chronology__title {
    top: 40px;
  }

  .p-chronology .l-container {
    padding-top: 100px;
    padding-left: 0;
    padding-right: 0;
  }

  .p-chronology__content {
    padding: 40px 10px;
  }

  .p-chronology__year {
    font-size: 1.4rem;
  }

  .p-chronology__year.swiper-slide-active {
    font-size: 1.5rem;
  }

  .p-chronology__timeline {
    padding: var(--s-24) 0;
    flex-direction: row !important;
    flex-wrap: nowrap;
    align-items: center;
  }

  .p-chronology__timeline-left {
    width: 20%;
    border-right: none;
    border-bottom: none;
    padding: 0;
    margin: 0;
  }

  .p-chronology__year-list {
    width: 100%;
    height: 100%;
  }
}

/* ==========================================================================
   Section - Stay Connected (SNS)
   ========================================================================== */
.p-sns {
  background-color: #dcdddd;
  text-align: center;
}

.p-sns__title {
  margin-bottom: 30px;
  line-height: 1.1;
}

.p-sns__text {
  font-size: 1.6rem;
  font-weight: bold;
  letter-spacing: 1rem;
  color: #444444;
  margin-bottom: 30px;
}

.p-sns__list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 35px;
}

.p-sns__item a {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s;
}

.p-sns__item a:hover img {
  animation: hover_bounce 0.5s ease both;
  backface-visibility: hidden;
}

.p-sns__item img {
  width: 40px;
  height: auto;
}

/* ==========================================================================
   Section - Sponsors
   ========================================================================== */
.p-sponsors {
  background-color: #ffffff;
  text-align: center;
}

.p-sponsors__heading {
  line-height: 1.1;
  margin-bottom: 0;
}

.p-sponsors__block {
  margin-top: 70px;
}

.p-sponsors__role {
  font-family: var(--f-main);
  font-size: 1.6rem;
  font-weight: bold;
  color: #444;
  margin-bottom: 30px;
}

.p-sponsors__logo-area {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
}

.p-sponsors__logo-link {
  display: block;
}

.p-sponsors__logo-link:hover {
  animation: hover_bounce 0.5s ease both;
  backface-visibility: hidden;
}

.p-sponsors__link-block {
  margin-top: 70px;
}

.p-sponsors__link-heading {
  font-family: var(--f-en);
  font-size: 4rem;
  font-weight: bold;
  color: #444444;
  line-height: 1.1;
  margin-bottom: 30px;
}

/* ==========================================================================
   Section - Link
   ========================================================================== */
.p-link {
  background-color: #ffffff;
  text-align: center;
}

.p-link__heading {
  line-height: 1.1;
  margin-bottom: 40px;
}

.p-link__logo-area {
  min-height: 90px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 40px;
}

.p-link__logo-link {
  width: 300px;
  max-width: 100%;
  height: auto;
  display: block;
  transition: opacity 0.3s ease;
}

.p-link__logo-link:hover {
  animation: hover_bounce 0.5s ease both;
  backface-visibility: hidden;
}

/* ==========================================================================
   SP: ハンバーガーメニュー
   ========================================================================== */

/* ハンバーガーボタン（PCでは非表示） */
.l-hamburger {
  display: none;
}

/* SP限定ナビ項目（PCでは非表示） */
.l-header__sp-only {
  display: none;
}

@media screen and (max-width: 767px) {

  /* SP: ヘッダーレイアウト変更 */
  .l-header__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    gap: 0;
  }

  /* SPメニューオープン時: ヘッダーを画面上部に固定（bodyスクロールロック時の飛び出し防止） */
  .l-header.is-nav-open {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 600;
    background-color: transparent !important;
    backdrop-filter: none !important;
  }

  /* SP: スクロール後に上固定・縦幅を縮める */
  .l-header.is-scrolled {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 500;
    background-color: rgba(10, 15, 40, 0.95);
    backdrop-filter: blur(6px);
    transition: background-color 0.3s ease;
  }

  .l-header.is-scrolled .l-header__inner {
    padding: 10px 20px;
  }

  .l-header.is-scrolled .l-header__logo {
    width: 75px;
  }

  /* SP: ロゴをヘッダー左に */
  .l-header__logo {
    width: 45vw;
    max-width: 200px;
    order: -1;
  }

  /* SP: ナビは初期非表示 */
  .l-header__nav {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 100;
    background-color: rgba(10, 15, 40, 0.97);
    backdrop-filter: blur(6px);
    justify-content: center;
    align-items: center;
  }

  /* SP: ナビ open状態 */
  .l-header__nav.is-active {
    display: flex;
  }

  .l-header__nav-list {
    flex-direction: column;
    align-items: center;
    gap: 30px;
  }

  /* SP限定ナビ項目を表示 */
  .l-header__sp-only {
    display: block;
  }

  /* SNSアイコン行: 横並び */
  .l-header__sp-sns {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 32px;
    margin-top: 1.5rem;
  }

  .l-header__sns-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
  }

  .l-header__sns-link:hover {
    opacity: 1;
  }

  .l-header__sns-link img {
    width: 36px;
    height: 36px;
    /* SVGアイコンを白色に */
    filter: brightness(0) invert(1);
  }

  .l-header__nav-item a {
    font-size: 2.4rem;
    color: var(--c-white);
    letter-spacing: 0.1em;
  }

  /* 各見出しのSP用フォントサイズ縮小 */
  /* 画像の高さは共通設定で調整済み */

  /* ハンバーガーボタン表示 */
  .l-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    z-index: 200;
    position: relative;
  }

  .l-hamburger__line {
    display: block;
    width: 28px;
    height: 2px;
    background-color: var(--c-white);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  /* × アイコンへの変形 */
  .l-hamburger.is-active .l-hamburger__line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .l-hamburger.is-active .l-hamburger__line:nth-child(2) {
    opacity: 0;
  }

  .l-hamburger.is-active .l-hamburger__line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* ==========================================================================
   Utility
   ========================================================================== */
.u-hidden-pc {
  display: none !important;
}

@media screen and (max-width: 767px) {
  .u-hidden-sp {
    display: none !important;
  }

  .u-hidden-pc {
    display: block !important;
  }
}

@media screen and (min-width: 768px) {
  .u-hidden-pc {
    display: none !important;
  }

  .u-hidden-sp {
    display: block !important;
  }
}

/* SPのみ表示（brなどSP限定の改行に使用） */
.u-display-sp {
  display: none;
}

@media screen and (max-width: 767px) {
  .u-sp-none {
    display: none !important;
  }
}

@media screen and (max-width: 767px) {
  .u-display-sp {
    display: inline;
  }

  .l-container {
    padding: 40px var(--s-24);
  }
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes hover_bounce {
  0% {
    transform: scale(1);
  }

  10% {
    transform: scale(0.925);
  }

  40% {
    transform: scale(1.15);
  }

  100% {
    transform: scale(1);
  }
}

/* ==========================================================================
   スクロールオフセット（固定ヘッダー分のずれを補正）
   ========================================================================== */

/* PC: 固定ナビ（padding: 14px×2 + ロゴ高さ≒51.85px = 79.85px） */
#fv,
#concept,
#chronology,
#graduates,
#documents,
#sns,
#sponsors,
#link {
  scroll-margin-top: 79.85px;
}

/* SP: 固定ヘッダー（padding: 15px×2 + ロゴ高さ≒34px = 64px） */
@media screen and (max-width: 767px) {

  #fv,
  #concept,
  #chronology,
  #graduates,
  #documents,
  #sns,
  #sponsors,
  #link {
    scroll-margin-top: 64px;
  }
}

/* ==========================================================================
   Modal Video (Object embed for fallback)
   ========================================================================== */
.c-modal-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.c-modal-video.is-active {
  opacity: 1;
  visibility: visible;
}

.c-modal-video__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  cursor: pointer;
}

.c-modal-video__inner {
  position: relative;
  width: 90%;
  max-width: 1000px;
  z-index: 1;
}

.c-modal-video__close {
  position: absolute;
  top: -40px;
  right: 0;
  width: 30px;
  height: 30px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.c-modal-video__close-line {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #fff;
  transition: background-color 0.3s;
}

.c-modal-video__close:hover .c-modal-video__close-line {
  background-color: #ccc;
}

.c-modal-video__close-line:first-child {
  transform: translateY(-50%) rotate(45deg);
}

.c-modal-video__close-line:last-child {
  transform: translateY(-50%) rotate(-45deg);
}

.c-modal-video__content {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  background-color: #000;
}

.c-modal-video__content iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}