/* テンプレート21: 左サイドバーナビ + ティール系 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&display=swap');

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

body {
    font-family: 'Noto Sans JP', 'Hiragino Sans', sans-serif;
    font-size: 16px;
    line-height: 1.9;
    color: #2d3748;
    background-color: #e6fffa;
}

.layout-wrapper {
    display: flex;
    min-height: 100vh;
}

/* 左サイドバーナビゲーション */
.sidebar-nav {
    width: 260px;
    background: linear-gradient(180deg, #0d9488 0%, #0f766e 100%);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 40px 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.1);
}

.sidebar-nav .logo {
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    padding: 0 20px 30px;
    border-bottom: 1px solid rgba(255,255,255,0.2);
    margin-bottom: 20px;
}

.sidebar-nav nav {
    flex: 1;
}

.sidebar-nav nav ul {
    list-style: none;
}

.sidebar-nav nav li {
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-nav nav a {
    display: block;
    padding: 16px 30px;
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.sidebar-nav nav a:hover,
.sidebar-nav nav a.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
    padding-left: 40px;
}

.sidebar-footer {
    padding: 20px 30px;
    font-size: 0.8rem;
    opacity: 0.7;
    text-align: center;
}

/* メインコンテンツ */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 50px;
}

.content-box {
    background: #fff;
    border-radius: 16px;
    padding: 60px 70px;
    box-shadow: 0 4px 25px rgba(0,0,0,0.08);
    max-width: 900px;
    margin: 0 auto;
}

.content-box h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #0d9488;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 3px solid #0d9488;
}

.content-box h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #0f766e;
    margin: 40px 0 20px;
    padding-left: 15px;
    border-left: 4px solid #0d9488;
}

.intro p {
    font-size: 1.1rem;
    color: #4a5568;
    margin-bottom: 30px;
}

.center-image {
    text-align: center;
    margin: 40px 0;
}

.center-image img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.center-image figcaption {
    margin-top: 15px;
    font-size: 0.9rem;
    color: #718096;
}

.main-text p,
.sub-text p {
    margin-bottom: 20px;
    text-align: justify;
}

.content-footer {
    text-align: center;
    padding: 40px 0 20px;
    margin-top: 50px;
    color: #718096;
    font-size: 0.85rem;
}

/* レスポンシブ */
@media (max-width: 1024px) {
    .sidebar-nav {
        width: 220px;
    }
    .main-content {
        margin-left: 220px;
        padding: 30px;
    }
    .content-box {
        padding: 40px 50px;
    }
}

@media (max-width: 768px) {
    .layout-wrapper {
        flex-direction: column;
    }
    .sidebar-nav {
        width: 100%;
        height: auto;
        position: relative;
        padding: 20px 0;
    }
    .sidebar-nav .logo {
        padding-bottom: 15px;
        margin-bottom: 15px;
    }
    .sidebar-nav nav ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        padding: 0 15px;
    }
    .sidebar-nav nav li {
        border-bottom: none;
    }
    .sidebar-nav nav a {
        padding: 10px 15px;
        font-size: 0.85rem;
    }
    .sidebar-nav nav a:hover,
    .sidebar-nav nav a.active {
        padding-left: 15px;
    }
    .sidebar-footer {
        display: none;
    }
    .main-content {
        margin-left: 0;
        padding: 20px;
    }
    .content-box {
        padding: 30px 25px;
        border-radius: 12px;
    }
    .content-box h1 {
        font-size: 1.6rem;
    }
    .content-box h2 {
        font-size: 1.25rem;
    }
}

/* サイトマップ */
.sitemap-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.sitemap-list li {
    margin-bottom: 15px;
    padding-left: 20px;
    position: relative;
}

.sitemap-list li::before {
    content: '›';
    position: absolute;
    left: 0;
    font-weight: bold;
}

.sitemap-list a {
    text-decoration: none;
    transition: all 0.3s ease;
}

.sitemap-list a:hover {
    opacity: 0.7;
}