/* リセットCSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基本スタイル */
body {
    font-family: 'Hiragino Sans', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* コンテナ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヘッダー */
header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

/* ナビゲーション */
nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: rgba(255,255,255,0.2);
}

/* メインコンテンツ */
main {
    padding: 2rem 0;
    min-height: calc(100vh - 140px);
}

.content {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* 見出し */
h1 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
    border-bottom: 3px solid #3498db;
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
    color: #34495e;
}

h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.8rem 0;
    color: #34495e;
}

/* 段落とリスト */
p {
    margin-bottom: 1rem;
}

ul, ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #2980b9;
}

.btn-secondary {
    background-color: #95a5a6;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

/* フッター */
footer {
    background-color: #34495e;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: auto;
}

/* Unity WebView最適化 */
@media screen and (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
        text-align: center;
    }

    .content {
        padding: 1.5rem;
        margin: 1rem 0;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.3rem;
    }
}

/* スマートフォン向け最適化 */
@media screen and (max-width: 480px) {
    .content {
        padding: 1rem;
        border-radius: 0;
    }

    h1 {
        font-size: 1.3rem;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}