@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700&family=Roboto:wght@400;700&display=swap');

:root {
    --primary-color: #3f51b5;
    --text-color: #333;
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --link-color: #1a73e8;
    --spacing-unit: 1rem;
}

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

body {
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 2rem 1rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

header {
    margin-bottom: 3rem;
    text-align: center;
    border-bottom: 1px solid #eee;
    padding-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

ul {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

.last-updated {
    font-style: italic;
    color: #888;
    margin-bottom: 2rem;
}

@media (max-width: 600px) {
    .container {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }
}