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

:root {
    --primary-color: #01aac7;
    --primary-dark: #018ba0;
    --primary-light: #33bfcf;
    --secondary-color: #f8fbfc;
    --text-dark: #333333;
    --text-gray: #555555;
    --text-light: #9ca3af;
    --white: #ffffff;
    --border-light: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    --gradient-light: linear-gradient(135deg, #f8fbfc 0%, #ffffff 100%);
}

/* 全体共通 */

body {
    font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, "sans-serif";
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
    scroll-behavior: auto !important; /* smoothを上書き */
}

p {
    font-size: 1.25rem;
    color: var(--text-gray);
    line-height: 1.6;
    margin: 20px 0;
}

.border-line {
    background: var(--primary-light);
    width: 75px;
    height: 3px;
    margin: 50px 0;
}

/* 全体 */

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 2rem 0;
}

.pc {
    display: block !important;
}

.sp {
    display: none !important;
}


@media (max-width: 768px) {
    .border-line {
        width: 45px;
        margin: 30px 0;
    }

    .container {
        max-width: 90%;
        padding: 2rem 0;
    }

    .pc {
        display: none !important;
    }

    .sp {
        display: block !important;
    }

    br {
        display: none;
    }

    img {
        width: 100%;
        max-width: 100%;
    }
}



/* ナビゲーション 
--------------------------------*/
.navbar {
    width: 100%;
    transition: all 0.3s ease;
    position: inherit;
    z-index: 10;
}

.nav-container {
    max-width: 1080px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    padding: 1rem 0;
}


@media (max-width: 768px) {
    .navbar {}

    .nav-container {
        max-width: 90%;
        margin: 0 auto;
    }

    .nav-logo h2 {
        padding: 1rem 0;
    }

    .nav-logo h2 img {
        width: 120px;
    }
}

/* メインビジュアル
--------------------------------*/
.main-visual {
    background: var(--gradient-light);
    align-items: center;
    position: relative;
    overflow: hidden;
}

.main-visual::before {
    content: '';
    position: absolute;
    top: 0;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(1, 170, 199, 0.1) 0%, transparent 70%);
    z-index: 0;
}

.mv-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 50px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.mv-content {
    max-width: 640px;
    /* animation: fadeInUp 1s ease-out; */
}

.mv-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.highlight {
    font-size: 3.6rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.mv-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 4rem;
    line-height: 1.6;
}

.mv-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.mv-buttons a{
    text-decoration: none!important;}

.btn-primary {
    width: 240px;
    padding: 1rem 0;
    text-align: center;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.mv-img {
    display: flex;
    justify-content: center;
    /* animation: fadeInRight 1s ease-out 0.3s both; */
}


@media (max-width: 768px) {
    .main-visual {
        width: 100%;
        max-width: 100%;
    }

    .main-visual::before {
        top: 0;
        right: 0%;
        width: 100%;
        height: 0;
    }

    .mv-container {
        max-width: 90%;
        padding: 20px 0 40px;
        display: block;
    }

    .mv-content {
        max-width: 100%;
        /* animation: fadeInUp 1s ease-out; */
    }

    .mv-title {
        text-align: center;
        font-size: 1.3rem;
        margin-bottom: 0.7rem;
    }

    .highlight {
        font-size: 2.3rem;
    }

    .mv-subtitle {
        text-align: center;
        font-size: 1rem;
        margin-bottom: 1rem;
        font-weight: 600;
    }

    .mv-buttons {
        display: block;
        gap: 1rem;
        flex-wrap: wrap;
        text-align: center;
    }

    .btn-primary {
        width: 240px;
        margin: 20px auto 0;
    }

    .mv-img img {
        width: 60% !important;
        margin: 0 auto;
    }
}


/*  sec01
--------------------------------*/
.sec01 {
    padding: 6rem 0;
}

.sec01>.container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    /* animation: fadeInUp 1s ease-out; */
}

.sec01 .section-header {
    text-align: left;
    margin-bottom: 4rem;
}

.sec01 .section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-light);
}

.sec01 .section-header p {
    font-size: 1.125rem;
    color: var(--text-gray);
    line-height: 1.7;
}

.sec01 .section-header .border-line {}

.sec01-visual {
    display: flex;
    justify-content: center;
}

@media (max-width: 768px) {
    .sec01 {
        padding: 3rem 0 2rem;
    }

    .sec01>.container {
        display: block;
    }

    .sec01 .section-header {
        text-align: center;
        margin-bottom: 2rem;
    }

    .sec01 .section-header h2 {
        font-size: 1.3rem;
    }

    .sec01 .section-header .border-line {
        width: 45px;
        margin: 30px auto;
    }

    .sec01 .section-header p {
        font-size: 1rem;
        text-align: left;
    }

    .sec01-visual {}

    .sec01-visual img {
        width: 60% !important;
        margin: 0 auto;
    }
}


/*  sec02
--------------------------------*/
.sec02 {
    padding: 6rem 0;
    background: var(--secondary-color);
}

.sec02 .section-header {
    text-align: center;
    margin-bottom: 60px;
}

.sec02 .section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--primary-light);
}

.sec02 .section-header .border-line {
    background: var(--primary-light);
    margin: 50px auto;
}

.sec02-grid {
    width: 730px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(345px, 1fr));
    gap: 2rem;
    /* animation: fadeInUp 1s ease-out; */
}

.sec02-card {
    width: 345px;
    background: var(--white);
    padding: 2rem 0 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.sec02-inner {
    width: 305px;
    margin: 0 auto;
}

.sec02-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
}

.sec02-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
    text-align: center;
}

.sec02-card p {
    font-size: 0.85rem;
    color: var(--text-gray);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .sec02 {
        padding: 3rem 0 2rem;
    }

    .sec02 .section-header {
        text-align: center;
        margin-bottom: 40px;
    }

    .sec02 .section-header h2 {
        font-size: 1.3rem;
    }

    .sec02 .section-header .border-line {
        background: var(--primary-light);
        margin: 30px auto;
    }

    .sec02-grid {
        width: 100%;
        margin: 0 auto;
        display: block;
        grid-template-columns: repeat(auto-fit, minmax(285px, 1fr));
        gap: 2rem;
        /* animation: fadeInUp 1s ease-out; */
    }

    .mobile-card-swiper .sec02-card {
        max-width: 300px;
        width: 300px !important;
    }

    .sec02-inner {
        width: 85%;
    }

    .sec02-icon {
        width: 80px;
        height: 80px;
    }

    .sec02-card h3 {
        font-size: 1.15rem;
    }
}



/*  sec03
--------------------------------*/
.sec03 {
    padding: 6rem 0;
    background: var(--white);
}

/* Features Section */
.sec03 .container {
    max-width: 1080px;
    margin: 0 auto;
}

.sec03 .section-header {
    text-align: center;
    margin-bottom: 60px;
}

.sec03 .section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--primary-light);
}

.sec03 .section-header .border-line {
    background: var(--primary-light);
    margin: 50px auto;
}

/* Features Layout */
.sec03-left,
.sec03-right {
    margin-bottom: 80px;
    /* animation: fadeInUp 1s ease-out; */
}

.sec03-left:last-child,
.sec03-right:last-child {
    margin-bottom: 0;
}

.sec03-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sec03-content {
    width: 600px;
}

.sec03-img {
    max-width: 430px;
}

.sec03-img img {
    max-width: 100%;
    height: auto;
    /* border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); */
}

/* Content Styling */
.no {
    color: var(--primary-light);
    font-family: "DIN Alternate";
    font-size: 48px;
}

.sec03-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
    margin: 0 0 16px 0;
    line-height: 1.4;
}


.sec03-content .border-line {
    background: var(--primary-light);
    width: 35px;
    height: 3px;
    margin: 20px 0;
}

.text-area h4 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #333;
    margin: 0 0 16px 0;
    line-height: 1.5;
}

.text-area p {
    font-size: 1rem;
    color: #333;
    line-height: 1.7;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sec03 {
        padding: 3rem 0 1rem;
    }

    .sec03 .container {
        max-width: 100%;
        margin: 0 auto;
        padding: 0;
    }

    .sec03 .section-header {
        text-align: center;
        margin-bottom: 30px;
    }

    .sec03 .section-header h2 {
        font-size: 1.3rem;
    }

    .sec03 .section-header .border-line {
        margin: 30px auto;
    }

    .sec03 .sec03-inner {
        flex-direction: column;
        gap: 40px;
    }


    .sec03-inner {
        display: block;
        justify-content: space-between;
        align-items: center;
    }

    .sec03-content {
        width: 100%;
    }

    .sec03-img {
        max-width: 100%;
        margin-bottom: 20px;
    }

    .sec03-left,
    .sec03-right {
        width: 90%;
        margin: 0 auto;
        padding: 0 0 40px;
        margin-bottom: 40px;
        border-bottom: 1px solid #07A9C6;
    }


    .no {
        font-size: 2.5rem;
    }

    .sec03-content h3 {
        font-size: 1.3rem;
    }

    .border-line {
        width: 50px;
        margin: 12px 0 20px 0;
    }
}



/*  sec04
--------------------------------*/
.sec04 {
    padding: 6rem 0;
    background-color: #f8fbfc;
}

.sec04 .section-header {
    text-align: center;
    margin-bottom: 60px;
}

.sec04 .section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--primary-light);
}

.sec04 .section-header .border-line {
    background: var(--primary-light);
    margin: 50px auto;
}

.sec04-items {
    display: flex;
    justify-content: center;
    gap: 60px;
    /* animation: fadeInUp 1s ease-out; */
}

.sec04-item {
    max-width: 434px;
    text-align: center;
}

.sec04-item img {
    width: 100%;
    margin-bottom: 20px;
}

.sec04-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
}

.sec04-item p {
    font-size: 14px;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .sec04 {
        padding: 3rem 0 0;
    }

    .sec04 .section-header {
        text-align: center;
        margin-bottom: 40px;
    }

    .sec04 .section-header h2 {
        font-size: 1.3rem;
    }

    .sec04 .section-header .border-line {
        background: var(--primary-light);
        margin: 30px auto;
    }

    .sec04-items {
        width: 90%;
        margin: 0 auto;
        display: block;
        gap: 0;
    }

    .sec04-item {
        max-width: 100%;
        padding: 0 0 60px;
        margin-bottom: 60px;
        border-bottom: 1px solid #07A9C6;
    }

    .sec04-item img {
        width: 100%;
        margin-bottom: 20px;
    }

    .sec04-item h3 {
        font-size: 1.3rem;
        margin-bottom: 5px;
    }

    .sec04-item p {
        font-size: 1rem;
        text-align: left;
    }
}

/*  sec05
--------------------------------*/
.sec05 {
    padding: 6rem 0;
    background-color: #fff;
}


.sec05 .section-header {
    text-align: center;
    margin-bottom: 60px;
}

.sec05 .section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--primary-light);
}

.sec05 .section-header .border-line {
    background: var(--primary-light);
    margin: 50px auto;
}

.sec05-items {
    display: flex;
    justify-content: center;
    gap: 40px;
    /* animation: fadeInUp 1s ease-out; */
}

.sec05-item {
    width: 295px;
    background: var(--white);
    padding: 2rem 0 1rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
    text-align: center;
}

.sec05-item .box-icon img {
    width: 100px;
    height: 100px;
}


.sec05-item h3 {
    font-size: 20px;
    margin: 15px 0;
}

.sec05-item p {
    font-size: 14px;
    line-height: 1.6;
}



@media (max-width: 768px) {
    .sec05 {
        padding: 0 0 2rem;
    }

    .sec05 .section-header {
        text-align: center;
        margin-bottom: 60px;
    }

    .sec05 .section-header h2 {
        font-size: 1.3rem;
    }

    .sec05 .section-header .border-line {
        background: var(--primary-light);
        margin: 30px auto;
    }

    .sec05-items {
        display: block;
        justify-content: center;
        gap: 40px;
        /* animation: fadeInUp 1s ease-out; */
    }

    .sec05-item {
        width: 90%;
        max-width: 90%;
        margin: 0 auto;
    }

    .sec05-item-inner {
        width: 90%;
        margin: 0 auto;
    }

    .sec05-item .box-icon img {
        width: 80px;
        height: 80px;
    }


    .sec05-item h3 {
        font-size: 1.15rem;
        margin: 15px 0;
    }

    .sec05-item p {
        font-size: 1rem;
    }
}






/*  sec06
--------------------------------*/
.sec06 {
    padding: 6rem 0;
    background-color: #07a9c6;
    color: white;
}

.sec06 .section-header {
    text-align: center;
    margin-bottom: 60px;
}

.sec06 .section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    color: #fff;
}

.sec06 .section-header .border-line {
    background: #fff;
    margin: 50px auto;
}

/* フローステップコンテナ */
.sec06-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    gap: 20px;
    flex-wrap: wrap;
    /* animation: fadeInUp 1s ease-out; */
}

/* 各ステップ */
.sec06-step {
    background: #ffffff;
    border-radius: 20px;
    padding: 30px 0;
    width: 240px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    position: relative;
}

/* ステップアイコン */
.sec06-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sec06-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ステップ番号 */
.sec06-number {
    color: #40b8c4;
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

/* ステップタイトル */
.sec06-step h4 {
    color: #40b8c4;
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
}

/* ステップ説明文 */
.sec06-step p {
    color: #666666;
    font-size: 13px;
    line-height: 1.6;
}

/* 矢印 */
.sec06-arrow {
    width: 0;
    height: 0;
    border-left: 15px solid #ff6b9d;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    margin: 0 -10px;
}

/* レスポンシブ対応 */
@media (max-width: 1024px) {
    .sec06-steps {
        gap: 15px;
    }

    .sec06-step {
        width: 200px;
        padding: 25px 15px;
    }

    .sec06-arrow {
        border-left-width: 15px;
        border-top-width: 12px;
        border-bottom-width: 12px;
    }
}

@media (max-width: 768px) {
    .sec06 {
        padding: 3rem 0 2rem;
    }

    .sec06 .section-header {
        text-align: center;
        margin-bottom: 40px;
    }

    .sec06 .section-header h2 {
        font-size: 1.3rem;
    }

    .sec06 .section-header .border-line {
        background: #fff;
        margin: 30px auto;
    }

    .sec06-steps {
        flex-direction: column;
        gap: 30px;
    }

    .sec06-step {
        width: 90%;
        max-width: 320px;
    }

    .sec06-arrow {
        transform: rotate(90deg);
        margin: -15px 0;
    }

    /* ステップ番号 */
    .sec06-number {
        font-size: 1.15rem;
        margin-bottom: 20px;
    }

    /* ステップタイトル */
    .sec06-step h4 {
        font-size: 1.15rem;
        margin-bottom: 0px;
    }

    /* ステップ説明文 */
    .sec06-step p {
        font-size: 1rem;
        margin: 5px 0 10px;
    }
}

@media (max-width: 480px) {
    .sec06 {
        padding: 40px 30px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .sec06-step {
        width: 90%;
        padding: 20px 0;
        margin: 0 auto;
    }
}


/* お問い合わせセクション全体 */
.contact {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 0;
    gap: 80px;
}

/* 左側の情報エリア */
.contact-info {
    flex: 1;
    max-width: 450px;
}

.contact-info h2 {
    color: #40b8c4;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

/* 区切り線 */
.contact .contact-info .divider-small {
    width: 40px;
    height: 3px;
    background-color: #40b8c4;
    margin-bottom: 30px;
}

.contact-info p {
    color: #666666;
    font-size: 14px;
    line-height: 1.8;
    letter-spacing: 0.5px;
}

/* 右側のフォームエリア */
.contact-form {
    flex: 1;
    max-width: 500px;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 入力フィールド共通スタイル */
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px 20px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: #ffffff;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: #999999;
    font-size: 14px;
}

/* フォーカス時のスタイル */
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #40b8c4;
    box-shadow: 0 0 0 3px rgba(64, 184, 196, 0.1);
}

/* テキストエリア */
.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

/* 送信ボタン */
.contact-form .btn {
    background: linear-gradient(135deg, #40b8c4 0%, #3ca0b8 100%);
    color: #ffffff;
    border: none;
    padding: 15px 40px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
    box-shadow: 0 4px 10px rgba(64, 184, 196, 0.3);
}

.contact-form .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(64, 184, 196, 0.4);
}

.contact-form .btn:active {
    transform: translateY(0);
}

/* レスポンシブ対応 */
@media (max-width: 968px) {
    .contact {
        flex-direction: column;
        gap: 50px;
        margin: 20px auto;
    }

    .contact-info,
    .contact-form {
        max-width: 100%;
        width: 100%;
    }
}

@media (max-width: 768px) {
    .contact {
        padding: 2rem 0;
    }

    .contact .contact-info {
        text-align: left;
        margin-bottom: 0px;
    }

    .contact .contact-info h2 {
        font-size: 1.3rem;
    }

    .contact .contact-info .divider-small {
        width: 40px;
        height: 3px;
        margin: 30px 0;
    }

    .contact-info,
    .contact-form {
        max-width: 90%;
        width: 90%;
        margin: 0 auto;
    }

    .contact-form input,
    .contact-form textarea {
        width: 100%;
        padding: 12px 10px;
        font-size: 1rem;
    }

    .contact-info p {
        font-size: 1rem;
    }

    .contact-form .btn {
        width: 100%;
        text-align: center;
        padding: 12px 0;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .contact {
        gap: 20px;
    }

    .contact-form form {
        gap: 15px;
    }

    .contact-form textarea {
        min-height: 120px;
    }

    .contact-form .btn {
        width: 100%;
    }
}

/* Footer */
footer {
    background-color: #111;
    color: #fff;
    font-size: 12px;
    text-align: center;
    padding: 10px 0;
}


/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

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



/* --- Modern Language Switcher --- */
.lang-switcher {
    /* 矢印を配置するための基準点として設定 */
    position: relative; 
}

#language-selector {
    /* 1. ブラウザの標準スタイルをリセット */
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    outline: none;
    border: none;
    background-color: transparent;

    /* 2. モダンな見た目の設定 */
    padding: 8px 36px 8px 12px; /* 内側の余白 (上, 右(矢印用), 下, 左) */
    font-size: 14px;
    font-weight: 500;
    color: #333; /* 文字色 */
    background-color: #f8f9fa; /* 背景色 (ほんのりグレー) */
    border: 1px solid #dee2e6; /* 枠線 */
    border-radius: 6px; /* 角の丸み */
    cursor: pointer;

    /* 3. アニメーション効果 */
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

/* 4. マウスが乗った時のスタイル */
#language-selector:hover {
    border-color: #adb5bd; /* 枠線の色を少し濃くする */
}

/* 5. 選択中（フォーカス時）のスタイル */
#language-selector:focus {
    border-color: #80bdff; /* 青い枠線 */
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2); /* 外側にぼんやりとした影 */
}

/* 6. カスタム矢印の追加 */
.lang-switcher::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 12px; /* 右からの位置 */
    transform: translateY(-50%); /* 上下中央に配置 */
    
    /* SVGで作成した矢印アイコン */
    width: 16px;
    height: 16px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23555'%3E%3Cpath d='M8 10.5a.5.5 0 0 1-.354-.146l-4-4a.5.5 0 0 1 .708-.708L8 9.293l3.646-3.647a.5.5 0 0 1 .708.708l-4 4A.5.5 0 0 1 8 10.5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    
    /* 矢印自体がクリックされるのを防ぐ */
    pointer-events: none; 
}