/* リセットとベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Meiryo', sans-serif;
    line-height: 1.8;
    color: #5a5a5a;
    background: linear-gradient(135deg, #f5f1e8 0%, #faf8f3 50%, #f0ede4 100%);
    min-height: 100vh;
    font-weight: 500;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヘッダー */
header {
    background: linear-gradient(135deg, #e8e0d3 0%, #f0e8db 100%);
    padding: 60px 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.main-title {
    font-size: 2.5rem;
    color: #6b5b4f;
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.subtitle {
    font-size: 1.1rem;
    color: #8b7d6f;
    font-weight: 500;
}

/* セクション */
.section {
    padding: 60px 0;
}

.section-title {
    font-size: 2rem;
    color: #6b5b4f;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 700;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(to right, #d4c4b0, #c4b4a0);
}

/* コンテンツボックス */
.content-box {
    background: rgba(255, 255, 255, 0.6);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(10px);
}

.purpose-text {
    font-size: 1.05rem;
    color: #5a5a5a;
    margin-bottom: 20px;
    line-height: 2;
}

.purpose-text:last-child {
    margin-bottom: 0;
}

/* 活動詳細グリッド */
.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.detail-card {
    background: rgba(255, 255, 255, 0.7);
    padding: 35px 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.detail-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.detail-title {
    font-size: 1.3rem;
    color: #6b5b4f;
    margin-bottom: 15px;
    font-weight: 600;
}

.detail-text {
    font-size: 1rem;
    color: #5a5a5a;
    line-height: 1.8;
}

/* 活動説明 */
.activity-description {
    background: rgba(255, 255, 255, 0.5);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.activity-description p {
    font-size: 1.05rem;
    color: #5a5a5a;
    line-height: 2;
    text-align: center;
}

/* 連絡先 */
.contact-text {
    font-size: 1.05rem;
    color: #5a5a5a;
    margin-bottom: 25px;
    text-align: center;
}

.contact-info {
    text-align: center;
}

.contact-item {
    font-size: 1.1rem;
    color: #5a5a5a;
    margin-bottom: 15px;
}

.contact-item strong {
    color: #6b5b4f;
    font-weight: 700;
}

.contact-link {
    color: #8b7d6f;
    text-decoration: none;
    transition: color 0.3s ease;
    border-bottom: 1px solid transparent;
}

.contact-link:hover {
    color: #6b5b4f;
    border-bottom-color: #c4b4a0;
}

.contact-note {
    font-size: 0.9rem;
    color: #8b7d6f;
    margin-top: 20px;
    font-style: italic;
}

/* フッター */
footer {
    background: linear-gradient(135deg, #e8e0d3 0%, #f0e8db 100%);
    padding: 30px 0;
    text-align: center;
    margin-top: 60px;
}

.footer-text {
    color: #8b7d6f;
    font-size: 0.9rem;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .main-title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .details-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .content-box {
        padding: 30px 20px;
    }

    .section {
        padding: 40px 0;
    }

    header {
        padding: 40px 0;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.6rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .content-box {
        padding: 25px 15px;
    }
}