body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    color: #333;
}
.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
    color: #0066cc;
}
h2 {
    margin-bottom: 30px;
    font-size: 1.5rem;
    color: #3421b4;
}
.section-title {
    margin-top: 40px;
    font-weight: bold;
    font-size: 1.3rem;
    border-left: 6px solid #0066cc;
    padding-left: 10px;
    color: #222;
}

.date {
    font-weight: bold;
    color: #555;
}
.note {
    background-color: #f9f9f9;
    padding: 10px;
    border-left: 3px solid #0066cc;
    margin: 20px 0;
}

.photo-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 30px;
}
.photo-gallery img {
    width: 100%;
    height: auto;
    border-radius: 5px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
.back-link:hover {
    text-decoration: underline;
}

.back-link {
    position: fixed;
    top: 10px;
    left: 10px;
    background: #fff;
    padding: 6px 10px;
    border-radius: 4px;
    color: #0066cc;
    box-shadow: 0 0 5px rgba(0,0,0,0.15);
    text-decoration: none;
    z-index: 1000;
}

/* ===== スマホ対応 ===== */
@media screen and (max-width: 767px) {

    body {
        font-size: 15px;
    }

    .container {
        margin: 10px;
        padding: 15px;
    }

    h1 {
        font-size: 1.6rem;
        margin-bottom: 20px;
    }

    h2 {
        font-size: 1.3rem;
        margin-bottom: 20px;
    }

    .section-title {
        font-size: 1.1rem;
        margin-top: 30px;
    }

    .note {
        padding: 8px;
        font-size: 0.95rem;
    }

    /* 写真を1列表示 */
    .photo-gallery {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* 戻るリンクをタップしやすく */
    .back-link {
        top: 8px;
        left: 8px;
        padding: 10px 14px;
        font-size: 0.9rem;
    }
}