/* メインナビゲーションのスタイル */
.main-navigation {
    display: flex;
    align-items: center;
}
.main-navigation ul.main-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}
.main-navigation li {
    position: relative;
    margin-left: 2rem;
}
.main-navigation a {
    font-size: 1rem;
    text-decoration: none;
    color: #ffffff;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}
.main-navigation a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: #ffffff;
    transition: width 0.3s ease;
}
.main-navigation a:hover::after {
    width: 100%;
}
/* サブメニューのスタイル */
.main-navigation ul.sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    padding: 0.5rem 0;
    min-width: 250px; /* サブメニューの最小幅を増やす */
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 1000;
}
.main-navigation li:hover > ul.sub-menu,
.main-navigation li:focus-within > ul.sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}
.main-navigation ul.sub-menu li {
    margin: 0;
    padding: 0;
}
.main-navigation ul.sub-menu a {
    color: #333;
    font-size: 0.9rem;
    padding: 0.7rem 1.5rem; /* 左右のパディングを増やす */
    display: block;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    white-space: nowrap; /* テキストの折り返しを防ぐ */
    overflow: hidden;
    text-overflow: ellipsis; /* 長いテキストの場合は省略記号で表示 */
}
.main-navigation ul.sub-menu li:last-child a {
    border-bottom: none;
}
.main-navigation ul.sub-menu a:hover {
    color: #0056b3;
    background-color: rgba(0, 86, 179, 0.05);
    padding-left: 2rem; /* ホバー時の左パディングを調整 */
}
/* サブメニューの矢印 */
.main-navigation ul.sub-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid rgba(255, 255, 255, 0.95);
}
/* ホバー状態の維持 */
.main-navigation li:hover > a,
.main-navigation li:focus-within > a {
    color: #ffffff;
}
/* ハンバーガーメニューのスタイル */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 10px;
    cursor: pointer;
    z-index: 1001;
}
.menu-icon,
.menu-icon::before,
.menu-icon::after {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #ffffff;
    position: relative;
    transition: all 0.3s;
}
.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
}
.menu-icon::before {
    top: -8px;
}
.menu-icon::after {
    bottom: -8px;
}
.menu-toggle.active .menu-icon {
    background-color: transparent;
}
.menu-toggle.active .menu-icon::before {
    top: 0;
    transform: rotate(45deg);
}
.menu-toggle.active .menu-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}
/* レスポンシブデザイン */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
        position: fixed;
        top: 10px;
        right: 10px;
        background-color: rgba(0, 0, 0, 0.7);
        border-radius: 5px;
        padding: 10px;
    }
    .main-navigation {
        position: fixed;
        top: 0;
        right: -250px; /* 初期状態では画面外に配置 */
        width: 250px;
        height: 100vh;
        background-color: rgba(0, 0, 0, 0.9);
        transition: right 0.3s ease-in-out;
        overflow-y: auto;
        padding: 60px 20px 20px;
        z-index: 1000;
    }
    .main-navigation.toggled {
        right: 0; /* メニューを表示するときに画面内に移動 */
    }
    .main-navigation ul.main-menu {
        flex-direction: column;
    }
    .main-navigation li {
        margin: 0 0 15px 0;
    }
    .main-navigation a {
        display: block;
        padding: 10px;
        font-size: 1.1rem;
        color: #ffffff;
    }
    .main-navigation ul.sub-menu {
        position: static;
        background-color: transparent;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        padding-left: 1rem;
        min-width: auto;
    }
    .main-navigation ul.sub-menu::before {
        display: none;
    }
    .main-navigation ul.sub-menu a {
        color: #ffffff;
        border-bottom: none;
        padding: 0.5rem 0;
        white-space: normal; /* モバイルでは折り返しを許可 */
    }
    .main-navigation ul.sub-menu a:hover {
        background-color: transparent;
        color: #ffffff;
        padding-left: 0;
    }
}