body {
    font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
    line-height: 1.8;
    margin: 0;
    padding: 0;
}

.header {
    text-align: center;
    margin: 40px 0;
}

.container {
    display: flex;
    flex-direction: column;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.main {
    order: 1;
}

.sidebar {
    order: 2;
    margin-top: 40px;
    font-size: 0.9em;
    color: #555;
}

.poem-body {
    white-space: pre-line;
    margin-top: 20px;
}

.poem-image {
    margin: 40px 0;
    text-align: center;
}

.poem-image img {
    max-width: 100%;
    height: auto;
    opacity: 0.9;
}


.footer {
    margin: 80px 0 40px;
    text-align: center;
    font-size: 0.85em;
    color: #666;
}

.support a {
    text-decoration: none;
    border-bottom: 1px solid #aaa;
}

.chapter {
    margin-bottom: 40px;
}

.chapter h3 {
    font-size: 1.1em;
    margin-bottom: 10px;
}

details summary {
    cursor: pointer;
    color: #666;
    font-size: 0.9em;
}

.poem-list {
    list-style: none;
    padding-left: 0;
    margin-top: 10px;
    font-size: 0.85em;
    color: #777;
}

.poem-list li {
    margin-bottom: 6px;
}

.day-nav {
    margin-top: 40px;
    font-size: 0.8em;
    color: #aaa;
}

.day-nav a {
    color: inherit;
    text-decoration: none;
}

.day-nav a:hover {
    text-decoration: underline;
}

/* PC */
@media (min-width: 768px) {
    .container {
        flex-direction: row;
        gap: 40px;
    }

    .main {
        flex: 3;
        order: 1;
    }

    .sidebar {
        flex: 1;
        order: 2;
        margin-top: 0;
    }
}