/* ▼▼▼ common ▼▼▼ */
html {
  overflow-x: hidden;
  scroll-behavior: smooth;
  font-size: 0.875rem;
  font-family: 'Noto Sans JP', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Meiryo', sans-serif;
}
body {
    background-color: #102244;
    color: #FFF;
}
.u__br {
    display: block;
}
.u__br--sp {
    display: block;
}
.wrapper {
    display: flex;
    justify-content: center;
    position: relative;
}
.container {
    margin: 0 24px;
}
.section__heading {
    font-size: 1.71rem;
    font-weight: 700;
    margin: 0 0 50px 24px;
    position: relative;
}
.section__heading::before {
    content: "";
    display: block;
    height: 113px;
    width: 27px;
    background-image: url('assets/decoration-short-sp.png');
    position: absolute;
    top: 0;
    left: -27px;
}
.section__heading--overview::before {
    height: 153px;
    width: 28px;
    left: -28px;
    background-image: url('assets/decoration-long-sp.png');
}
.section__heading--english {
    font-family: 'Monaco', 'Noto Sans JP', sans-serif;
    font-size: 2.57rem;
    font-weight: 400;
    display: block;
    margin: 0 0 16px;
    word-break: break-all;
}
/* ▲▲▲ common ▲▲▲ */

/* ▼▼▼ header ▼▼▼ */
header {
    position: fixed; 
    width: 100%;
    height: 64px;
    background-color: rgba(7, 21, 44, 0.9);
    top: 0;
    left: 0;
    z-index: 1;
    display: flex;
    align-items: center;        
    justify-content: space-between;
    padding: 0 24px;
}
.header__logo {
    width: 200px;
    height: 40px;
}
.header__logo--anchor {
    display: block;
}
.header__box {
    display: none;
}
.header__hamburger {
    background-color: #FFF;
    height: 40px;
    width: 40px;
    border-radius: 4px;
    z-index: 2;
}
.header__hamburger--line {
    background-color: #102244;
    display: block;
    height: 3px;
    width: 20px;
    border-radius: 4px;
    margin: 0 auto;
}
.header__hamburger--line:nth-child(1) {
    margin: 0 auto 4px;
}
.header__hamburger--line:nth-child(3) {
    margin: 4px auto 0;
}
.header__hamburger--cross .header__hamburger--line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.header__hamburger--cross .header__hamburger--line:nth-child(2) {
  opacity: 0;
}
.header__hamburger--cross .header__hamburger--line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}
.header__nav--sp {
    position: absolute;
    top: 0;
    right: -260px;
    height: 100dvh;
    width: 260px;
    background-color: rgba(255, 255, 255, 0.9);
    transition: right 0.3s ease;
}
.header__nav--open {
    right: 0;
}
.header__list--sp {
    margin: 100px 0 0 50px;
}
.header__item--sp {
    color: #000000;
    font-size: 1.29rem;
    font-weight: 700;
    margin: 0 0 32px;
}
.header__item--sp:hover {
    text-decoration: underline;
}
/* ▲▲▲ header ▲▲▲ */

/* ▼▼▼ fv ▼▼▼ */
.fv {
    height: 100dvh;
    background-image: url("assets/fv-background-sp.png");
    background-repeat: no-repeat;
    background-position: top 0 right -44px;
    position: relative;
    background-color: #102244;
}
.fv__box {
    position: absolute;
    left: 24px;
    bottom: 88px;
    width: calc(100% - 48px);
}
.fv__time {
    font-family: 'Lao MN', 'Noto Sans JP', sans-serif;
    font-size: 2rem;
    display: block;
    margin: 0 0 6px;
}
.fv__heading {
    font-family: 'Lao MN', 'Noto Sans JP', sans-serif;
    font-size: 4rem;
    margin: 0 0 12px;
    white-space: normal;
    overflow-wrap: break-word;
}
.fv__hedaing--conference {
    font-size: 2rem;
    display: block;
    color: #B4F6FF;
    margin: 8px 0 0;
}
.fv__text {
    font-family: 'BIZ UDPゴシック', 'Noto Sans JP', sans-serif;
    font-size: 1.14rem;
    font-weight: 700;
    line-height: 1.6;
}
.floating {
    position: fixed;
    bottom: 0;
    left: 0;
    background-color: #03EBFF;
    width: 100%;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 3;
}
.floating__list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
}
.floating__item {
    font-size: 1.14rem;
    font-weight: 700;
    color: #102244;
    position: relative;
    text-align: center;
}
.floating__item:hover {
    text-decoration: underline;
}
.floating__item:first-child {
    border-right: 1px solid #102244;
}
.pagetop {
    position: fixed;
    bottom: 78px;
    right: 10px;
    height: 40px;
    width: 40px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 100%;
    z-index: 2;
}
.pagetop:hover,
.pagetop:has(.pagetop__anchor:focus) {
    background-color: #03EBFF;
}
.pagetop__anchor {
    color: #102244;
    font-size: 1.29rem;
    font-weight: 900;
    transform: rotate(270deg);
    padding: 0 0 0 9px;
    border-radius: 100%;
    position: absolute;
    height: 100%;
    width: 100%;
    top: 0;
    left: -1px;
    display: flex;
    justify-content: center;
    align-items: center;
}
/* ▲▲▲ fv ▲▲▲ */

/* ▼▼▼ overview ▼▼▼ */
.overview {
    margin: 30px 0 80px;
    scroll-margin-top: 80px;
}
.overview__heading {
    font-size: 2.1rem;
    font-weight: 700;
    margin: 0 0 80px;
    line-height: 1.6;
}
.overview__text {
    font-size: 1.29rem;
    font-weight: 400;
    margin: 0 0 120px;
    line-height: 1.6;
}
.overview__info--term {
    width: 120px;
    padding: 6px 0;
    border: 1px solid #FFF;
    text-align: center;
    margin: 0 0 16px;
}
.overview__info--desc {
    font-size: 1.14rem;
    margin: 0 0 20px;
}
.overview__info--anchor {
    color: #7EE4F5;
    text-decoration: underline;
}
.overview__info--anchor:hover,
.overview__info--anchor:focus {
    text-decoration: none;
}
/* ▲▲▲ overview ▲▲▲ */

/* ▼▼▼ timetable ▼▼▼ */
.timetable {
    margin: 0 0 60px;
    scroll-margin-top: 80px;
}
.timetable__list {
    font-size: 1.14rem;
    padding: 30px 20px;
    border: 1px solid#FFF;
    border-radius: 8px;
}
.timetable__item {
    border-bottom: 1px solid#FFF;
    padding: 24px 0;
}
.timetable__item--time {
    display: block;
    margin: 0 0 8px;
}
.timetable__item:first-child {
    padding: 0 0 24px;
}
.timetable__item:last-child {
    border-bottom: 0px;
    padding: 24px 0 0;
}
.timetable__heading {
    font-weight: 700;
    line-height: 1.6;
}
.timetable__text {
    line-height: 1.6;
}
/* ▲▲▲ timetable ▲▲▲ */


/* ▼▼▼ speaker ▼▼▼ */
.speaker {
    margin: 0 0 60px;
    scroll-margin-top: 80px;
}
.speaker__list {
    display: grid;
    gap: 28px 0;
}
.speaker__title {
    font-size: 1.14rem;
    font-weight: 700;
    margin: 0 0 10px;
    line-height: 1.6;
}
.speaker__box {
    border: 1px solid#FFF;
    border-radius: 8px;
    padding: 20px 20px 60px;
}
.speaker__img {
    height: 100px;
    width: 100px;
    float: left;
    margin: 0 16px 0 0;
}
.speaker__heading {
    min-height: 100px;
    font-size: 1.57rem;
    font-weight: 700;
}
.speaker__heading--position {
    font-size: 1.14rem;
    display: block;
    margin: 0 0 8px;
    line-height: 1.4;
}
.speaker__heading--engligh {
    font-size: 1rem;
    display: block;
    margin: 8px 0;
}
.speaker__text {
    margin: 16px 0 0;
    line-height: 1.6;
}
/* ▲▲▲ speaker ▲▲▲ */


/* ▼▼▼ cta ▼▼▼ */
.cta {
    display: none;
}
/* ▲▲▲ cta ▲▲▲ */


/* ▼▼▼ access ▼▼▼ */
.access {
    margin: 0 0 60px;
    scroll-margin-top: 80px;
}
.access__address {
    margin: 0 0 30px;
    line-height: 1.6;
}
.access__transportation {
    margin: 0 0 16px;
    font-size: 1.14rem;
    font-weight: 700;
}
.access__list {
    margin: 0 0 30px;
    padding: 0 0 0 16px;
    line-height: 1.6;
    list-style: disc;
}
.access__item {
    margin: 0 0 4px;
}
.access__item:last-child {
    margin: 0;
}
.access__map {
    height: 300px;
    width: 100%;
}
/* ▲▲▲ access ▲▲▲ */


/* ▼▼▼ afterparty ▼▼▼ */
.afterparty {
    margin: 0 0 80px;
    scroll-margin-top: 80px;
}
.afterparty__place {
    margin: 0 0 54px;
}
.afterparty__text {
    line-height: 1.6;
}
/* ▲▲▲ afterparty ▲▲▲ */


/* ▼▼▼ banner ▼▼▼ */
.banner__list {
    display: grid;
    gap: 16px;
    grid-template-columns: 1fr 1fr;
}
.banner__list--anchor{
    display: block;
}
.banner__list--img {
    max-width: 100%;
}
/* ▲▲▲ banner ▲▲▲ */


/* ▼▼▼ footer ▼▼▼ */
footer {
    padding: 60px 0 100px;
    text-align: center;
    background: linear-gradient(to bottom, #102244, #07152D);
}
.footer__copyright {
    font-size: 0.86rem;
}
/* ▲▲▲ footer ▲▲▲ */



@media screen and (min-width: 767px) {
    header {
        height: 86px;
        padding: 0 40px;
    }
    .header__logo {
        max-width: 320px;
        /* height: 64px; */
        width: 100%;
        height: auto;
    }
    .fv {
        height: 600px;
        background-position: top 0 right 0;
    }
    .fv__box {
        left:  64px;
        bottom: 88px;
    }
    .floating {
        display: none;
    }
    .pagetop {
        bottom: 40px;
    }
    .container {
        margin: 0 64px;
    }
    .overview {
        scroll-margin-top: 20px;
    }
    .timetable {
        scroll-margin-top: 120px;
    }
    .speaker {
        scroll-margin-top: 120px;
    }
    .cta {
        display: flex;
        justify-content: center;
        margin: 0 0 80px;
    }
    .cta__list {
        text-align: center;
        display: block;
    }
    .cta__item {
        width: 20rem;
        font-size: 1.71rem;
        font-weight: 700;
        color: #000000;
        border-radius: 40px;
        position: relative;
    }
    .cta__item:first-child {
        margin: 0 0 32px;
    }
    .cta__item::after {
        content: "〉";
        font-size: 1.57rem;
        position: absolute;
        display: inline-block;
        top: 21px;
        right: 28px;
    }
    .cta__item:hover::after,
    .cta__item:has(.cta__item--anchor:focus)::after {
        transform: translateX(25%);
    }
    .cta__item--red {
        background: linear-gradient(to right, #8CB3FD, #E1D7F7, #F4B5EA);
    }
    .cta__item--green {
        background: linear-gradient(to right, #45DAF4, #AFFAEA, #6FEA99);
    }
    .cta__item--red:hover,
    .cta__item--red:has(.cta__item--anchor:focus) {
        background: linear-gradient(to right, #F4B5EA, #E1D7F7, #8CB3FD);
    }
    .cta__item--green:hover,
    .cta__item--green:has(.cta__item--anchor:focus) {
        background: linear-gradient(to right, #6FEA99, #AFFAEA, #45DAF4);
    }
    .cta__item--anchor {
        width: 100%;
        display: block;
        height: 100%;
        padding: 20px 0;
        border-radius: 40px;
    }
    .access {
        scroll-margin-top: 120px;
    }
    .afterparty {
        scroll-margin-top: 0px;
    }
    .banner__list {
        gap: 0 16px;
        grid-template-columns: 1fr 1fr 1fr 1fr;
    }
}


@media screen and (min-width: 1026px) {
    html {
        font-size: 1rem;
    }
    body {
        background-image: url('assets/overview-background.png');
        background-repeat: no-repeat;
        background-position: center center;
        background-size: cover;
        background-attachment: fixed;
    }
    .wrapper::before {
        content: "";
        display: block;
        position: absolute;
        height: 400px;
        width: 100%;
        top: 0;
        left: 0;
        background: linear-gradient(to bottom, rgba(16,34,68,1), rgba(16,34,68,0));
    }
    .u__br--sp {
        display: none;
    }
    .section__heading {
        font-size: 1.75rem;
        margin: 0 0 50px 32px;
    }
    .section__heading--english {
        font-size: 3rem;
    }
    .section__heading::before {
        height: 145px;
        width: 38px;
        background-image: url('assets/decoration-short-pc.png');
        left: -38px;
    }
    .section__heading--overview::before {
        height: 209px;
        width: 38px;
        left: -38px;
        background-image: url('assets/decoration-long-pc.png');
    }
    .fv {
        height: 760px;
        width: 100%;
        background-image: url(assets/fv-background-pc.png);
        background-position: center center;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .fv__box {
        position: relative;
        width: 100%;
        max-width: 1200px;
        margin: 86px 88px 0;
        left: 0;
        bottom: 0;
    }
    .fv__time {
        font-size: 3.13rem;
        margin: 0;
    }
    .fv__heading {
        font-size: 6.25rem;
        margin: 0 0 16px;
    }
    .fv__hedaing--conference {
        font-size: 3.13rem;
    }
    .fv__text {
        font-size: 1.88rem;
    }
    .pagetop {
        right: 14px;
        height: 60px;
        width: 60px;
    }
    .pagetop__anchor {
        font-size: 1.38rem;
        padding: 0 0 0 13px;
    }
    .container {
        max-width: 1200px;
        margin: 0 88px;
    }
    .overview {
        display: grid;
        gap: 0 50px;
        grid-template-columns: 380px auto;
        padding: 100px 0 0;
        margin: 0 0 120px;
        position: relative;
    }
    .overview__text {
        margin: 0 0 100px;
    }
    .overview__info {
        display: grid;
        gap: 24px 40px;
        grid-template-columns: 120px auto;
    }
    .overview__info--term {
        font-size: 0.88rem;
        height: 32px;
        margin: 0;
        display: flex;
        justify-content: center;
        align-items: center; 
    }
    .overview__info--desc {
        font-size: 1rem;
        margin: 0;
        display: flex;
        align-items: center; 
    }
    .timetable {
        display: grid;
        gap: 0 50px;
        grid-template-columns: 380px auto;
        margin: 0 0 120px;
    }
    .timetable__list {
        font-size: 1.13rem;
        padding: 40px;
    }
    .timetable__item {
        display: grid;
        gap: 0 40px;
        grid-template-columns: 120px auto;
        padding: 32px 0;
    }
    .timetable__item:first-child{
        padding: 0 0 32px;
    }
    .timetable__item:last-child{
        padding: 32px 0 0;
    }
    .timetable__item--time {
        margin: 0;
    }
    .speaker {
        display: grid;
        gap: 0 50px;
        grid-template-columns: 380px auto;
        margin: 0 0 140px;
    }
    .speaker__list {
        gap: 40px 0;
    }
    .speaker__title {
        font-size: 1.13rem;
        margin: 0 0 16px;
    }
    .speaker__box {
        padding: 40px;
        min-height: 260px;
    }
    .speaker__img {
        height: 180px;
        width: 180px;
        margin: 0 40px 0 0;
    }
    .speaker__heading {
        min-height: auto;
        font-size: 1.5rem;
    }
    .speaker__heading--position {
        font-size: 1.13rem;
    }
    .speaker__heading--engligh {
        font-size: 1rem;
        display: inline;
        margin: 0 0 0 16px;
    }
    .speaker__text {
        margin: 20px 0 0 220px;
    }
    .cta {
        margin: 0 0 150px;
    }
    .cta__item {
        width: 25rem;
        font-size: 1.75rem;
    }
    .cta__item::after {
        font-size: 1.5rem;
        top: 22px;
        right: 32px;
    }
    .access {
        display: grid;
        gap: 0 50px;
        grid-template-columns: 380px auto;
        margin: 0 0 120px;
    }
    .access__address {
        margin: 0 0 40px;
    }
    .access__transportation {
        margin: 0 0 24px;
    }
    .access__item {
        margin: 0 0 8px;
    }
    .access__map {
        height: 500px;
    }
    .afterparty {
        display: grid;
        gap: 0 50px;
        grid-template-columns: 380px auto;
        margin: 0 0 120px;
    }
    .afterparty__place {
        font-size: 1.13rem;
    }
    .afterparty__text {
        font-size: 1rem;
    }
    footer {
        padding: 160px 0 30px;
        background: linear-gradient(to bottom, rgba(16,34,68,0), rgba(7,21,45,1));
    }
}

@media screen and (min-width: 1200px) {
    .cta__list {
        display: flex;
        gap: 0 60px;
    }
    .cta__item:first-child {
        margin: 0;
    }
}

@media screen and (min-width: 1405px) {
    .header__box {
        display: flex;
        text-align: center;
    }
    .header__nav {
        font-family: 'Arial', 'Noto Sans JP', sans-serif;
        font-size: 0.9rem;
        margin: 0 40px 0 0;
        display: flex;
        align-items: center;
    }
    .header__nav--list {
        display: flex;
        margin: 0 0 6px;
    }
    .header__nav--item {
        position: relative;
        margin: 0 30px 0 0;
    }
    .header__nav--item:hover,
    .header__nav--item:has(a:focus) {
        color: #7EE4F5;
    }
    .header__nav--item:last-child {
        margin: 0;
    }
    .header__nav--anchor {
        padding: 0 0 16px;
    }
    .header__nav--anchor::after {
        content: "〉";
        position: absolute;
        display: inline-block;
        transform: translateX(-50%) translateY(140%) rotate(90deg);
        bottom: 0;
        left: 50%;
    }
    .header__nav--anchor:hover::after,
    .header__nav--anchor:focus::after {
        transform: translateX(-50%) translateY(160%) rotate(90deg);
    }
    .header__contact {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0 20px;
    }
    .header__contact--anchor {
        background-color: #FFF;
        padding: 12px 32px;
        border-radius: 40px;
        color: #07152C;
        font-weight: 700;
    }
    .header__contact--anchor:hover,
    .header__contact--anchor:focus {
        background-color: #03EBFF;
    }
    .header__hamburger {
        display: none;
    }
    .header__nav--sp {
        display: none;
    }
}


/* モーダルの基本スタイル */
.modal {
  display: none; 
  position: fixed; 
  z-index: 9999; 
  left: 0; 
  top: 0; 
  width: 100%; 
  height: 100%; 
  background-color: rgba(0,0,0,0.5); 
}

/* モーダルの中身 */
.modal-content {
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  max-width: 400px;
  margin: 15% auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

/* ボタン */
.modal button {
  margin: 10px;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
.modal button:hover {
  opacity: 0.8;
}
.modal .btn-local { background: #007bff; color: #fff; }
.modal .btn-online { background: #28a745; color: #fff; }
@media screen and (max-width: 450px) {
    .header__logo {
        width: 50vw;
        height: auto;
    }
    .header__nav--sp {
        width: 180px;
    }
    .header__list--sp {
        margin: 60px 0 0 30px;
    }
    .header__item--sp {
        margin: 0 0 24px;
    }
    .fv__box {
        left: 18px;
        bottom: 66px;
        width: calc(100% - 36px);
    }
    .fv__time {
        font-size: 1.25rem;
    }
    .fv__heading {
        font-size: 2.57rem;
    }
    .fv__hedaing--conference {
        font-size: 1.5rem;
    }
    .fv__text {
        font-size: 1rem;
    }
    .floating__item {
        font-size: 0.86rem;
    }
}


.modal-close {
  position: absolute;
  top: 0px;   /* モーダル内で少し余裕を残す */
  right: 0px;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #666;
}

.modal-close:hover {
  color: #000;
}
.modal-content {
  position: relative;
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  max-width: 400px;
  margin: 15% auto;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.fa {
    margin: 0 0.2em;
}
.partner-list li {
    list-style: disc;
    list-style-position: inside;
    line-height: 1.6;
}
.modal .btn-local {
    background: #19468f !important;
}