/* 基本リセットと共通設定 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: #fcfbf9; /* 温かみのあるごく薄い生成り色 */
    color: #333333;
    line-height: 1.8;
    letter-spacing: 0.05em;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 60px 20px;
}

/* ヘッダー・ロゴ */
header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    max-width: 240px;
    width: 100%;
    height: auto;
}

/* メインコンテンツ */
main {
    background-color: #ffffff;
    padding: 50px 40px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

h1 {
    font-size: 22px;
    text-align: center;
    margin-bottom: 40px;
    color: #111111;
    font-weight: 700;
    line-height: 1.5;
    position: relative;
    padding-bottom: 20px;
}

h1::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background-color: #111111;
}

.content p {
    margin-bottom: 24px;
    font-size: 15px;
    text-align: justify;
    text-justify: inter-ideograph;
}

.signature {
    text-align: right;
    font-weight: bold;
    margin-top: 40px;
    color: #222222;
}

/* ボタン */
.button-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 50px;
    margin-bottom: 10px;
}

.btn {
    display: inline-block;
    width: 180px;
    text-align: center;
    background-color: #111111;
    color: #ffffff;
    text-decoration: none;
    padding: 14px 0;
    font-size: 15px;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s ease;
    border: 2px solid #111111;
}

.btn:hover {
    background-color: transparent;
    color: #111111;
}

/* フッター */
footer {
    text-align: center;
    margin-top: 50px;
    font-size: 12px;
    color: #888888;
}

/* レスポンシブ対応 */
@media (max-width: 560px) {
    .container {
        padding: 30px 15px;
    }
    
    main {
        padding: 35px 20px;
    }
    
    h1 {
        font-size: 18px;
    }
    
    .content p {
        font-size: 14px;
        margin-bottom: 20px;
    }
    
    .button-container {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}