/* Reset & base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    background-color: #f9f9f9;
    color: #333;
    padding: 0;
    margin: 0;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #222;
    border-bottom: 3px solid #4CAF50;
    padding-bottom: 0.4rem;
}

h2 {
    font-size: 1.6rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: #333;
    border-left: 5px solid #4CAF50;
    padding-left: 0.75rem;
}

h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    color: #444;
    border-left: 3px solid #4CAF50;
    padding-left: 0.5rem;
}

h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 1.2rem;
    margin-bottom: 0.6rem;
    color: #555;
    padding-left: 0.3rem;
    border-left: 3px solid #ccc;
}

/* Layout */
.site-header {
    background: #004080;
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
 font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: #fff;
    display: inline-block;
    font-family: 'Arial Black', sans-serif;
    letter-spacing: 0.5px;
}

.nav a {
    color: white;
    margin-left: 1rem;
    text-decoration: none;
}

.nav a:hover {
    text-decoration: underline;
}

.site-main {
    padding: 2rem;
    min-height:95vh;
    max-width:1000px;
    margin-left:auto;
    margin-right: auto;
}
.listlinkArea ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: flex-start;
}

.listlinkArea li {
    flex: 1 1 200px; /* 最小200pxで、余裕あれば広がる */
    max-width: 300px; /* 最大でもこれ以上は広がらない */
}

.listlinkArea li a {
    display: block;
    background-color: #f5f5f5;
    padding: 1rem;
    border-radius: 8px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    transition: background-color 0.2s, box-shadow 0.2s;
}

.listlinkArea li a:hover {
    background-color: #e0f7e9;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.site-footer {
    background: #eee;
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
}


/* Responsive */
@media (max-width: 768px) {
    .site-main {
    padding: 0.5rem;
    min-height:95vh;
    max-width:1000px;
    margin-left:auto;
    margin-right: auto;
}
    .site-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav {
        margin-top: 0.5rem;
    }

    .nav a {
        display: block;
        margin: 0.5rem 0;
    }
}