/* ============================== 全体設定 ============================== */
@charset "utf-8";

body {
    font-family: 'Noto Sans JP', 'メイリオ', Meiryo, 'ヒラギノ角ゴシック','Hiragino Sans', sans-serif;
    background: linear-gradient(to right, #2f3b7e, #00a49f);
}

a {
    text-decoration: none;
    color: inherit;
}


/* ============================== ヘッダー表示設定 ============================== */

/* ==================== ヒーローセクション ==================== */

.hero {
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;
    color: #ffffff;
}

.hero:before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100vh;
    background: linear-gradient(to right, #2f3b7e, #00a49f);
}

.hero-top {
    position: fixed;
    top: 100px;
    left: 120px;
    font-weight: bold;
}

.hide {
    opacity: 0;
}

.hero-top p {
    font-size: 4rem;
}

.hero-top h1 {
    font-size: 8rem;
    margin-top: -20px;
}

.hero-bottom {
    position: fixed;
    bottom: 100px;
    right: 120px;
    text-align: right;
    font-size: 3rem;
    font-weight: bold;
}

@media (max-width: 1024px) {
    .hero-top {
        top: 80px;
        left: 70px;
    }

    .hero-top p {
        font-size: 3rem;
    }

    .hero-top h1 {
        font-size: 6rem;
    }

    .hero-bottom {
        right: 70px;
        bottom: 80px;
        font-size: 2.2rem;
    }
}

@media (max-width: 640px) {
    .hero {
        height: 120vw;
    }

    .hero-top {
        top: 60px;
        left: 20px;
    }

    .hero-top p {
        font-size: 2rem;
    }

    .hero-top h1 {
        font-size: 4rem;
    }

    .hero-bottom {
        right: 20px;
        font-size: 1.4rem;
    }
}


/* ----- 出現アニメーション（上） ----- */

.slide-in {
    overflow: hidden;
    display: inline-block;
    opacity: 0;
    animation-name: slideTextX100;
    animation-duration: 0.8s;
    animation-fill-mode: forwards;
}

p .slide-in {
    animation-delay: 0.2s;
}
h1 .slide-in {
    animation-delay: 0.8s;
}

.slide-in_inner {
    display: inline-block;
    animation-name: slideTextX-100;
    animation-duration: 0.8s;
    animation-fill-mode: forwards;
    opacity: 0;
    
}

p .slide-in_inner {
    animation-delay: 0.2s;
}
h1 .slide-in_inner {
    animation-delay: 0.8s;
}

@keyframes slideTextX100 {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideTextX-100 {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ----- 出現アニメーション（下） ----- */
.bgextend {
    animation-name: bgextendAnimeBase;
    animation-duration: 1s;
    animation-fill-mode: forwards;
    position: relative;
    overflow: hidden;
    opacity:0;
}

@keyframes bgextendAnimeBase {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.bgextend::before {
    animation-name: bgLRextendAnime;
    animation-duration: 1s;
    animation-fill-mode: forwards;
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: #ffffff;
    opacity: 0;
}

@keyframes bgLRextendAnime {
    0% {
        transform-origin: left;
        transform: scaleX(0);
        opacity: 1;
    }
    50% {
        transform-origin: left;
        transform: scaleX(1);
    }
    50.001% {
        transform-origin: right;
    }
    100% {
        transform-origin: right;
        transform: scaleX(0);
        opacity: 1;
    }
}

.bgappear {
    animation-name: bgextendAnimeSecond;
    animation-duration: 1s;
    animation-delay: 0.6s;
    animation-fill-mode: forwards;
    opacity: 0;
}

@keyframes bgextendAnimeSecond {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

.hero-bottom p:nth-of-type(1) .bgextend::before {
    animation-delay: 1.6s;
}
.hero-bottom p:nth-of-type(1) .bgappear {
    animation-delay: 2.2s;
}

.hero-bottom p:nth-of-type(2) .bgextend::before {
    animation-delay: 2.4s;
}
.hero-bottom p:nth-of-type(2) .bgappear {
    animation-delay: 3s;
}


#bg-word_container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

@media (max-width: 640px) {
    #bg-word_container {
        display: none;
    }
}

/* ----- 文字のスタイル ----- */
.bg-word {
    position: fixed;
    transform: translate(-50%, -50%);
    text-align: center;
    white-space: nowrap;
    font-size: 16px;
    color: #ffffff00;
    pointer-events: none;
    transition: color 0.2s ease;
}

.phys_words {
    font-family: "Libertinus Math", serif;
    font-style: italic;
    font-size: 1.2rem;
    user-select: none;
    -webkit-user-select: none;
}

.info_words {
    font-family: "Google Sans Code", monospace;
    user-select: none;
    -webkit-user-select: none;
}


/* ==================== サブヘッダー ==================== */
.sub {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
    width: 100%;
    height: 70px;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    background: #444444;
    color: #ffffff;
    opacity: 0;
}


/* サブヘッダー表示 (フェードイン) */
.sub.show {
    display: flex;
    animation-name: subHeader_fadeIn;
    animation-duration: 0.5s;
    animation-fill-mode: forwards;
    opacity: 0;
}

@keyframes subHeader_fadeIn {
    from {
        opacity: 0;
        transform: translateY(-100px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* サブヘッダー非表示 (フェードアウト) */
.sub.fade-out {
    animation-name: subHeader_fadeOut;
    animation-duration: 0.5s;
    animation-fill-mode: forwards;
    opacity: 1;
}

@keyframes subHeader_fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }

    to {
        opacity: 0;
        transform: translateY(-100px);
    }
}


/* ==================== ハンバーガーメニュー（ナビゲーション） ==================== */

.menu {
    position: fixed;
    top: 10px;
    right: 10px;
    cursor: pointer;
    width: 50px;
    height: 50px;
    z-index: 1000;
}

.menu span {
    display: inline-block;
    transition: all .4s;
    position: absolute;
    left: 13px;
    height: 3px;
    background-color: #ffffff;
    box-shadow: 0 2px 10px #444444b3;
}

.menu span:nth-of-type(1) {
    top: 22px;
    width: 50%;
}

.menu span:nth-of-type(2) {
    top: 29px;
    width: 30%;
}

/* activeクラスが付与されると線が回転して×に */
.menu.active span:nth-of-type(1) {
    top: 20px;
    left: 16px;
    transform: translateY(6px) rotate(-45deg);
    width: 35%;
}

.menu.active span:nth-of-type(2) {
    top: 32px;
    left: 16px;
    transform: translateY(-6px) rotate(45deg);
    width: 35%;
}

nav {
    position: fixed;
    z-index: -2;
    opacity: 0;
    top: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(to right, #2f3b7ecc, #00a49fcc);
    transition: all 0.3s;
    color: #ffffff;
}

/* アクティブクラスがついたら透過なしにして前面へ */
nav.n-active {
    opacity: 1;
    z-index: 999;
    position: fixed;
}


/* ナビゲーション */
nav ul {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}

nav.n-active ul {
    display: block;
}

nav h4 {
    text-align: center;
    font-size: 1.3rem;
    margin-bottom: 1em;
}

nav li {
    list-style: none;
    text-align: center;
    margin-bottom: 1em;
}

nav li a {
    padding: 10px;
    display: inline-block;
}

.nav-link {
    position: relative;
    display: inline-block;
    padding-bottom: 5px; /* テキストと下線の間隔 */
    background-image: linear-gradient(#ffffff, #ffffff);
    background-repeat: no-repeat;
    background-position: bottom right;
    background-size: 0 1.5px;
    transition: background-size 0.3s;
}

.nav-link:hover {
    background-position: bottom left;
    background-size: 100% 1.5px;
}

.blur {
    filter: blur(8px);
}


/* ============================== メイン要素 ============================== */

main {
    position: relative;
    z-index: 0;
    background: #f7f7f7;
    padding: 80px;
}

@media (max-width: 640px) {
    main {
        padding: 40px 20px;
    }
}


/* ==================== 全体紹介文 ==================== */

.introduction {
    background: #ffffff;
    width: 100%;
    max-width: 950px;
    margin: 100px auto 120px;
    padding: 60px 80px;
    position: relative;
    box-shadow: 0 4px 10px #0000001a;
    opacity: 0;
}

@media (max-width: 640px) {
    .introduction {
        margin: 100px auto;
        padding: 40px 30px;
    }
}

.introduction:before, .introduction:after {
    position: absolute;
    content: '';
}

.introduction:before {
    right: 0;
    bottom: 0;
    width: 80px;
    height: 80px;
    border-right: 4px solid #00a49f;
    border-bottom: 4px solid #00a49f;
}

.introduction:after {
    top: 0;
    left: 0;
    width: 80px;
    height: 80px;
    border-top: 4px solid #2f3b7e;
    border-left: 4px solid #2f3b7e;
}

.introduction h2 {
    text-align: center;
    font-size: 2rem;
    width: max-content;
    margin: 0 auto 1em auto;
    background: linear-gradient(to right, #2f3b7e, #00a49f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.introduction p {
    margin-bottom: 1em;
}

.zoomIn {
    animation-name: zoomInAnime;
    animation-duration: 0.5s;
    animation-fill-mode: forwards;
}

@keyframes zoomInAnime {
    from {
        transform: scale(0.6);
        opacity: 1;
    }

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


/* ==================== 各発表ページへのリンクカード ==================== */

.contents {
    max-width: 1200px;
    margin: 120px auto 100px;
}

@media (max-width: 640px) {
    .contents {
        margin: 100px auto;
    }
}

/* 全体紹介文の方のh2と同じ */
.contents h2 {
    text-align: center;
    font-size: 2rem;
    width: max-content;
    margin: 0 auto 1.5em auto;
    background: linear-gradient(to right, #2f3b7e, #00a49f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
}

.contents .links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

@media (max-width: 1024px) {
    .contents .links {
        grid-template-columns: repeat(2, 1fr)
    }
}

@media (max-width: 640px) {
    .contents .links {
        grid-template-columns: 1fr;
    }
}

.contents .links a {
    position: relative;
    top: 0;
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 10px #0000001a;
    transition: all .2s;
    opacity: 0;
}

.contents .links a:hover {
    top: -5px;
    box-shadow: 0 8px 15px #00000036;
}

.contents .links img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.contents .links h3 {
    display: flex;                /* 子要素をflexにする */
    justify-content: center;      /* 横方向：中央 */
    align-items: center;          /* 縦方向：中央 */
    text-align: center;           /* 複数行のとき中央寄せ維持 */
    font-size: 1.3rem;
    padding: 0 15px;
    height: 3.4em;
}


.physics {
    color: #2f3b7e;
}

.information {
    color: #00a49f;
}

.contents .links p {
    padding: 0 20px 20px;
    line-height: 1.8rem;
}

.flip {
    animation-name: flipAnime;
    animation-duration: 1s;
    animation-fill-mode: forwards;
    opacity: 0;
}

@keyframes flipAnime {
    from {
        transform: translate(-20px, 60px) rotate(15deg);
        opacity: 0;
    }

    to {
        transform: translate(0, 1) rotate(0deg);
        opacity: 1;
    }
}


/* ============================== フッター ============================== */

footer {
    position: relative;
    z-index: 0;
    background: linear-gradient(to right, #2f3b7e, #00a49f);
    color: #ffffff;
    padding: 40px 20px;
}

.footer-links {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto 1.5rem auto;
}

@media (max-width: 640px) {
    .footer-links {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

.footer-links h3 {
    font-size: 1rem;
    margin-bottom: 0.5em;
    font-weight: bold;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.3em;
}

/* SNS以外のリンクにだけ適用 */
.footer-links li:not(.sns) a {
    position: relative;
    display: inline-block;
    padding-bottom: 3px;
    background-image: linear-gradient(#ffffff, #ffffff);
    background-repeat: no-repeat;
    background-position: bottom right;
    background-size: 0 1.5px;
    transition: background-size 0.3s;
}

.footer-links ul:not(.sns) a:hover {
    background-position: bottom left;
    background-size: 100% 1.5px;
}

/* SNSアイコン */
.footer-links .sns {
    display: flex;
    gap: 1rem;
}

.footer-links .sns a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    font-size: 2rem;
    text-align: center;
}

.fa-instagram, .fa-x-twitter {
    display: block;
    width: 100%;
    height: 100%;
}

/* Instagram ホバー時の文字グラデーション */
.fa-instagram:hover {
    background: linear-gradient(45deg, rgba(254,212,117,1) 0%,rgba(229,61,93,1) 50%,rgba(194,49,134,1) 70%,rgba(156,56,187,1) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* X(Twitter) ホバー時 */
.fa-x-twitter:hover {
    color: #000000;
}

/* コピーライト */
footer small {
    display: block;
    text-align: center;
}