:root {
        --navy: #1e3a8a;
        --cream: #fef7e0;
        --deep-red: #dc2626;
        --gold: #d4af37;
        --light-blue: #e0f2fe;
        --left-pane-width: min(40vw, 260px);
    }

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

    body {
        font-family: 'Noto Serif JP', serif;
        background: #25231f;
        line-height: 1.7;
        color: #333;
    }

    /* --- Utility / Common Classes --- */
    /* よく使われる共通のスタイルをここに定義します */
    .u-shadow-base { /* 影のスタイル */
        box-shadow: 0 15px 40px rgba(0,0,0,0.1);
    }
    .u-bg-alpha-cream { /* 半透明の白背景 */
        background: rgba(255, 255, 255, 0.85);
    }
    .u-padding-3rem { /* 3remのパディング */
        padding: 3rem;
    }
    .u-border-radius-20 { /* 全角20pxの角丸 */
        border-radius: 20px;
    }
    .u-image-outer-wrapper { /* 画像コンテナの共通スタイル */
        position: relative;
        width: 100%;
        overflow: hidden;
    }
    .u-image-inner-cover { /* コンテナ内の画像の共通スタイル (width, object-fit) */
        width: 100%;
        object-fit: cover;
    }

    /* --- Button Styles --- */
    .button01 a {
        display: flex;
        justify-content: center;
        align-items: center;
        margin: 3em auto;
        padding: 1em 2em;
        color: #fff;
        font-size: 18px;
        font-weight: 700;
        background-color: var(--deep-red);
        transition: 0.5s;
        position: relative;
        width: max-content;
        text-decoration: none;
    }

    .button01 a::after {
        content: '';
        width: 5px;
        height: 5px;
        position: absolute;
        right: 2em;
    }

    .button01 a:hover {
        text-decoration: none;
        background-color: var(--navy);
    }

    /* --- Layout & Structure --- */
    .main-container {
        display: flex;
        min-height: 100vh;
    }

    .left-pane {
        position: fixed;
        left: 0;
        top: 0;
        width: 400px;
        height: 100vh;
        background: linear-gradient(135deg, var(--navy) 0%, #2563eb 50%);
        z-index: 1000;
        mask-image: radial-gradient(circle at 325% center, transparent 75%, black 40%);
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        padding: 5vh 0vw;
    }

    .logo-section h1 {
        font-family: 'Playfair Display', serif;
        color: white;
        font-size: 4rem;
        font-weight: 600;
        text-align: right;
        line-height: 1;
        padding: 0% 30% 0% 0%;
    }

    .logo-section p {
        color: var(--cream);
        font-size: 0.9rem;
        text-align: right;
    }

    .nav-menu {
        list-style: none;
        text-align: right;
        padding: 0% 35% 0% 0%;
    }

    .nav-menu li {
        margin: 1.5rem 0;
    }

    .nav-menu a {
        color: white;
        text-decoration: none;
        font-size: 1.2rem;
        font-weight: 500;
        transition: all 0.3s ease;
        display: block;
        padding: 0.5rem 0;
    }

    .nav-menu a:hover {
        color: var(--gold);
        transform: translateX(-10px);
    }

    .contact-section {
        text-align: right;
        padding: 0% 35% 0% 0%;
    }

    .contact-section h3 {
        color: white;
        font-size: 1rem;
        margin-bottom: 1rem;
    }

.btn-social-circle {
  display: inline-block;
  position: relative;
  box-sizing: border-box;
  text-decoration: none;
  color: #FFF;
  width: 50px;
  height: 50px;
  line-height: 30px;
  padding: 5px;
  font-size: 25px;
  border-radius: 50%;
  text-align: center;
  font-weight: bold;
  box-shadow: inset 0 2px 0px rgba(255, 255, 255, 0.25), inset 0 -2px 0px rgba(0, 0, 0, 0.18);
  transition: .2s;
}

.btn-social-circle:hover {
  box-shadow: none;
}

.btn-social-circle--twitter {
  background: #555;
  border: solid 5px #555;
fill: #fff;
}

.btn-social-circle--facebook {
  background: #3b75d4;
  border: solid 5px #3b75d4;
}

.btn-social-circle--pocket {
  background: #ef4d4d;
  border: solid 5px #ef4d4d;
fill: #892b2b;

}

.btn-social-circle--feedly {
  background: #7ece46;
  border: solid 5px #7ece46;
fill: green;

}







    .qr-placeholder {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        background: white;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-left: auto;
        box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }

    .qr-placeholder img {
        max-width: 100%;
        max-height: 100%;
        object-fit: cover;
    }

    .main-content {
        margin-left: var(--left-pane-width);
        width: calc(100% - var(--left-pane-width));
    }

    .section {
        min-height: 100vh;
        width: 100%;
        margin: 0 auto;
    }

    .section-inner {
        width: 1200px;
        max-width: 90%;
        justify-content: center;
        text-align: center;
        margin: 5rem auto;
        padding: 0 1rem;
    }

    .section-title {
        font-family: 'Playfair Display', serif;
        font-size: 5rem;
        color: var(--navy);
        text-align: center;
        font-weight: 600;
        border-radius: 20px 20px 0px 0px;
        background: linear-gradient(to right, var(--navy) 0%, #33f 33%,var(--cream) 33%, #fff 66%, var(--deep-red) 66%);
        text-shadow: #fff 1px 0 5px;
        padding: 1rem;
    }

    /* --- Common Section Background Styles --- */
    .-section-common-bg {
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        padding: 3rem;
        background-size: cover;
        background-position: center;
        background-attachment: fixed;
        background-repeat: no-repeat;
    }

    /* --- Hero Section --- */
    .hero-section {
        background-image: linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)),url(../img/bg_hero.jpg);
    }

    .hero-content h1 {
        font-family: 'Playfair Display', serif;
        font-size: 6rem;
        color: var(--cream);
        font-weight: 700;
        margin-bottom: 1rem;
        text-shadow: #fff 1px 0 10px;
        line-height: 1.1;
    }
    .hero-content .japan-week-title {
        color: var(--navy);
    }
    .hero-content .in-paris-title {
        color: var(--deep-red);
    }

    .hero-content h2 {
        font-size: 1.5rem;
        color: #fff;
        margin-bottom: 2rem;
        text-shadow: #fff 1px 0 10px;
    }

    .bridging-text {
        font-size: 3rem;
        color: #fff;
        font-weight: 600;
        margin: 2rem 0;
        text-shadow: #fff 1px 0 10px;
        line-height: 1;
    }
    .hero-content .button01 {
        padding-top: 10px;
    }

    /* --- Mission Section --- */
    .mission-section {
        background-image: linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)),url(../img/bg_mission.jpg);
    }

    .mission-content {
        border-radius: 0px 0px 0px 20px;
        margin-bottom: 3rem;
        text-align: left;
    }

    .mission-text {
        font-size: 1.2rem;
        line-height: 2;
        color: #555;
        margin-bottom: 2rem;
    }

    .cp_list li{
        position: relative;
        padding-left: 20px;
        border-bottom: dashed 2px #fff;
        font-size:max(1.5vw, 17px);
    }
    
    .cp_list li:before {
        content: "";
        position: absolute;
        top: .5em;
        left: 0;
        -webkit-transform: rotate(50deg);
        -ms-transform: rotate(50deg);
        transform: rotate(50deg);
        width: 8px;
        height: 15px;
        border-right: 2px solid var(--deep-red);
        border-bottom: 3px solid var(--deep-red);
    }

    .mission-grid-container {
        display: grid;
        grid-template-columns: 3fr 1fr;
        gap: 0rem;
    }

    .organizer-section {
        background: linear-gradient(135deg, var(--cream), white);
        padding-bottom: 7rem;
        border-radius: 0px 0px 20px 0px;
        display: flex;
        flex-direction: column;
        text-align: center;
        margin-bottom: 3rem;
    }

    .organizer-photo {
        width: 100%;
        flex-grow: 1;
        margin-bottom: 1rem;
    }
    .organizer-photo img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        object-position: 55% center;
    }

    /* --- Event Section --- */
    .event-section {
        background-image: linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)),url(../img/bg_event.jpg);
    }

    /* .u-image-outer-wrapperと.u-shadow-baseをHTMLで適用 */
    .event-main-image-container,
    .team-main-image-container {
        min-height: 550px; /* PC版の高さは維持 */
    }

    /* .u-image-inner-coverをHTMLで適用 */
    .event-main-image,
    .team-main-image {
        min-height: 550px; /* PC版の高さは維持 */
    }

    .event-details-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        color: white;
        text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
        background: rgba(0,0,0,0.3);
        padding: 3em;
        box-sizing: border-box;
    }
    .event-details-overlay h3 {
        font-family: 'Playfair Display', serif;
        font-size: max(2vw,2.5rem);
        margin-bottom: 1rem;
        color: white;
    }
    .event-details-overlay p {
        font-size: 1.5vw;
        margin-bottom: 0.5rem;
    }
    .event-details-overlay .bridging-text-event {
        font-size: 3vw;
        white-space: nowrap;
    }
    .event-details-overlay .event-text-padding {
        font-size:1.5vw;
        padding-bottom: 40px;
    }

    .event-card {
        background: white; /* 半透明ではないため、u-bg-alpha-creamは適用しない */
        border-radius: 0px 0px 0px 20px;
        text-align: left;
    }

    .event-card h3 {
        font-family: 'Playfair Display', serif;
        font-size: 1.8rem;
        color: var(--deep-red);
        margin-bottom: 1.5rem;
    }
        .popup-map-container {
            display: flex;
            flex-wrap: wrap;
        }
        .popup-map-item {
            flex: 1;
            min-width: 300px;
        }
    .popup-map-item p{
        line-height:1.3;
        font-size:max(1.1vw,16px);
    }
        .google-map-embed iframe {
            border:0;
            border-radius: 0px 0px 20px 0px;
        }

    .attendees{
        margin-top:2rem;
        }

    .attendees-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }

    .attendees-card {
        padding:10px;
        background-color: white;
        color: #4A5568;
        justify-content: flex-start;
        align-items: flex-start;
        text-align: left;
        overflow-y: auto;
    }


    .attendees-photo {
        width: 100px;
        height: 100px;
        border-radius: 50%;
        background: var(--light-blue);
        margin: 0 auto 1rem;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 3rem;
        color: var(--navy);
        overflow: hidden;
    }
    .attendees-photo img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .attendees-name {
        font-family: 'Playfair Display', serif;
        font-size: 1.5rem;
        margin-bottom: .5rem;
color:var(--navy);
font-weight:bold;
text-align:center;
    }
    .attendees h4 {
        font-family: 'Playfair Display', serif;
        font-size: 13px;
        margin-bottom: 1rem;
text-align:center;
    }

    .attendees p {
        font-family: 'Playfair Display', serif;
        font-size: 12px;
line-height:1.2;
        margin-bottom: 1rem;
    }

    /* --- Choices Section --- */
    .choice-section {
        background-image: linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)),url(../img/bg_plan.jpg);
    }

    /* .u-bg-alpha-creamと.u-padding-3remをHTMLで適用 */
    .choice-content {
        line-height: 1.2;
    }

    .space-y-3 li{
        position: relative;
        padding-left: 17px;
        border-bottom: dashed 2px #fff;
        font-size:max(0.7vw, 16px);
        line-height:1;
    }

    .space-y-3 li:before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        -webkit-transform: rotate(50deg);
        -ms-transform: rotate(50deg);
        transform: rotate(50deg);
        width: 8px;
        height: 15px;
        border-right: 2px solid var(--deep-red);
        border-bottom: 3px solid var(--deep-red);
    }

    /* .u-bg-alpha-creamと.u-shadow-baseをHTMLで適用 */
    .choice-after {
        padding: 0 3rem 5rem 3rem;
        border-radius: 0 0 20px 20px;
    }

    .choice-after div {
display: flex;
flex-wrap:wrap;
    }

    .choice-after img {
margin: 15px auto;
width:min(200px,10vw);
min-width:150px;
object-fit: scale-down;
    }

    .choices-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
        perspective: 1000px;
        margin-bottom: 2rem;
  justify-content: center; /* 水平方向の中央揃え */
    }

.choices-grid2 div:nth-child(1) {
grid-column: 1;
grid-row: 2;
grid-column-end: span 2;
}

    /* --- Card Base Styles --- */
    /* .u-shadow-baseと.u-border-radius-20をHTMLで適用 */
    .card-base {
        background-color: transparent;
        cursor: pointer;
        height: 300px; /* team-cardは個別にmin-heightを持つ */
        position: relative;
        transition: transform 0.3s ease;
        overflow: hidden;
    }

    .card-base2 {
        background-color: transparent;
        cursor: pointer;
        height: 200px; /* team-cardは個別にmin-heightを持つ */
        position: relative;
        transition: transform 0.3s ease;
        overflow: hidden;
    }

    .card-base3 {
        background-color: transparent;
        cursor: pointer;
        height: 300px; /* team-cardは個別にmin-heightを持つ */
        position: relative;
        transition: transform 0.3s ease;
        overflow: hidden;
    }

    .card-base:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 40px rgba(0,0,0,0.15); /* ホバー時の影は個別に設定 */
    }

    .card-inner {
        position: relative;
        width: 100%;
        height: 100%;
        text-align: center;
        transition: transform 0.6s;
        transform-style: preserve-3d;
        border-radius: 20px;
    }

    .card-front, .card-back {
        position: absolute;
        width: 100%;
        height: 100%;
        backface-visibility: hidden;
        border-radius: 20px;
        padding: 20px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        box-sizing: border-box;
        line-height: 1.2;
    }

    .card-front {
        background-color: var(--navy);
        color: white;
        z-index: 2;
    }

    .card-front h3 {
        margin-bottom: 8px;
        font-size: min(1.6vw,27px);
        font-weight: bold;
    }

    .card-front .price {
        font-size: 1.125rem;
        font-weight: bold;
        color: #fff;
    }

    .card-front2 {
        background-color: #fff;
        color: var(--navy);
    }

    .card-front3 {
        background-color: var(--deep-red);
        color: #fff;
    }


    .card-back {
        background-color: white;
        color: #4A5568;
        transform: rotateY(180deg);
        justify-content: flex-start;
        align-items: flex-start;
        text-align: left;
        overflow-y: auto;
    }

    .card-base.flipped .card-inner {
        transform: rotateY(180deg);
    }

    .card-back .choice-content {
        margin-top: 12px;
        width: 100%;
        padding: 0;
        background: none;
        box-shadow: none;
        border-radius: 0;
    }

    .card-back .choice-content ul {
        padding-left: 0;
        list-style: none;
    }

    .card-back .choice-content li {
        display: flex;
        align-items: flex-start;
        margin-bottom: 8px;
    }

    .card-back .choice-content li i {
        flex-shrink: 0;
        margin-right: 8px;
        padding-top: 2px;
    }

    .price {
        color: var(--gold);
    }

    .card-back-note,
    .card-after-note {
        font-size: 12px;
    }


    /* --- Team Section --- */
    .team-section {
        background-image: linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)),url(../img/bg_about.jpg);
    }

    .team-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 2rem;
    }

    .team-photo {
        width: 150px;
        height: 150px;
        border-radius: 50%;
        background: var(--light-blue);
        margin: 0 auto 1rem;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 3rem;
        color: var(--navy);
        overflow: hidden;
    }
    .team-photo img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .team-name {
        font-family: 'Playfair Display', serif;
        font-size: 15px;
        margin-bottom: 1rem;
    }

    .hashi-red {
        color: var(--deep-red);
    }
    /* .u-bg-alpha-creamをHTMLで適用 */
    .team-content {
        line-height: 1.1;
        font-size:min(1vw,14px);
    }
    /* .u-image-outer-wrapperと.u-shadow-baseをHTMLで適用 */
    .team-main-image-container {
        min-height: 480px; /* PC版の高さは維持 */
    }

    /* .u-image-inner-coverをHTMLで適用 */
    .team-main-image {
        min-height: 480px; /* PC版の高さは維持 */
        object-position: center 10%;
    }

    /* .u-bg-alpha-creamと.u-border-radius-20をHTMLで適用 */
    .text-container {
        position: relative;
        width: 100%;
        padding: 3em;
        margin-top: 3rem;
    }
    .text-container h3 {
        color: var(--navy);
    }
    .text-container .mission-text {
        text-align: center;
    }


    /* --- Footer --- */
    .footer {
        text-align: center;
        padding: 3rem;
        background: var(--deep-red);
        color: white;
        width: calc(100% - var(--left-pane-width));
        margin-left: var(--left-pane-width);
    }

    /* --- Mobile Styles --- */
    /* モバイル固有のスタイルは維持されます。 */
    /* 重複ルール解消のため、desktop側のプロパティを削除したことで、
        必要に応じてモバイル側で再定義される形になります。 */
    .spbr {
        display: none;
    }

    @media (max-width: 768px) {
        .spbr {
            display: inline;
        }

        .button01 a {
            margin: 1em auto;
            font-size: 4vw;
            padding: 1em 2em;
        }

        .left-pane {
            transform: translateX(-100%);
            transition: transform 0.3s ease;
            clip-path: none;
            width: 100%;
            border-radius: 0;
            padding: 3rem 0;
        }

        .left-pane.active {
            transform: translateX(0);
        }

        .main-content {
            margin-left: 0;
            width: 100%;
        }

        .section {
            padding: 2rem 0rem;
        }

        .hero-content h1 {
            font-size: 20vw;
            line-height: 1;
        }
        .bridging-text {
            font-size: 6vw;
            margin: 1rem 0;
        }
        .hero-content h2 {
            font-size: 1rem;
        }
        .hero-content .button01 a {
            font-size: 16px;
            padding: 0.8em 1.5em;
        }

        .section-inner {
            width: 98%;
            margin: 3rem auto;
            padding: 0 0.1rem;
        }

        .section-title {
            font-size: 2.5rem;
            padding: 0.8rem;
            border-radius: 15px 15px 0 0;
        }
        
        .mission-grid-container {
            grid-template-columns: 1fr;
        }
        .mission-content {
            border-radius: 0 0 20px 20px;
            margin-bottom: 2rem;
            padding: 2rem;
        }
        .mission-text {
            font-size: 1rem;
            line-height: 1.8;
        }
        .organizer-section {
            border-radius: 20px;
            margin-bottom: 0;
            padding-bottom: 3rem;
        }
        .organizer-photo img {
            border-radius: 20px 20px 0 0;
        }
        .organizer-section h4 {
            font-size: 1.2rem;
        }

        .event-main-image-container {
            min-height: 450px;
        }
        .event-details-overlay {
            padding: 1.5em;
        }
        .event-details-overlay h3 {
            font-size: 1.8rem;
        }
        .event-details-overlay p {
            font-size: 1rem;
            margin-bottom: 0.2rem;
        }
        .event-details-overlay .bridging-text-event {
            font-size: 8vw;
            line-height:1;
            margin-bottom:1em;
        }
        .event-details-overlay .event-text-padding {
            padding-bottom: 0px;
            font-size:14px;
        }

        .popup-map-container {
            flex-direction: column;
            /* REMOVE THIS LINE: max-height: 350px; */
        }
        .popup-map-item {
            width: 100%; /* Ensures item takes full width when stacked */
            min-width: 0; /* Allows item to shrink below 300px on very small screens */
        }
        .event-card.popup-map-item {
            border-radius: 0;
            padding: 2rem;
        }
        .event-card h3 {
            font-size: 1.5rem;
        }
        .map-container.popup-map-item .google-map-embed iframe {
            border-radius: 0px 0px 20px 20px;
        }
        .google-map-embed iframe {
            /* REMOVE THIS LINE: height: 300px; */
        }

        .choices-grid {
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .choice-content {
            padding: 2rem;
            line-height:1;
        }
        .choice-after {
            padding: 0 2rem 3rem 2rem;
        }
        .card-base {
            height: auto;
            min-height: 280px;
        }
        .card-front h3 {
            font-size: 1.1rem;
        }
        .card-front .price {
            font-size: 1rem;
        }
        .card-back .choice-content li {
            font-size: 0.9rem;
        }
        .card-back-note, .card-after-note {
            font-size: 10px;
        }

        .team-grid {
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        .team-card {
            padding: 2rem;
            line-height:1;
        }
        .team-photo {
            width: 40vw;
            height: 40vw;
        }
        .team-name {
            font-size: 1.2rem;
        }
        .team-content {
            padding: 0rem;
            line-height: 1;
            font-size:max(2.5vw,14px);
        }
        .team-main-image-container {
            min-height: 250px;
        }
        .text-container {
            padding: 2em 1em;
            margin-top: 2rem;
        }
        .text-container h3 {
            font-size: 1.5rem;
        }
        .text-container .mission-text {
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .footer {
            width: 100%;
            margin-left: 0;
            padding: 2rem;
            font-size: 0.8rem;
        }

        .hamburger {
            width: 40px;
            height: 32px;
            position: fixed; 
            top: 20px;
            left: 20px;
            z-index: 1001;
            color: white;
            border: none;
            padding: 1rem;
            border-radius: 5px;
            font-size: 1.2rem;
            cursor: pointer;
        }

        .hamburger_bar {
            display: block;
            width: 100%;
            height: 4px;
            position: absolute;
            left: 0;
            background: #fff;
        }

        .hamburger_bar:nth-child(1) {
            top: 0;
        }

        .hamburger_bar:nth-child(2) {
            top: 50%;
            transform: translateY(-50%);
        }

        .hamburger_bar:nth-child(3) {
            top: 100%;
            transform: translateY(-100%);
        }
    }