body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    font-size: 16px;
}

header {
    background-color: #fff;
    padding: 1.5rem 1rem;
    text-align: center;
    border-bottom: 1px solid #ddd;
    margin-bottom: 1rem;
}

header h1 {
    font-size: 1.8rem;
    margin: 0;
    color: #222;
}

header p.subtitle {
    font-size: 1.1rem;
    color: #666;
    margin: 0.5rem 0 0;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

section#story-section {
    padding: 1rem;
}

h2 {
    font-size: 1.5rem;
    color: #222;
    margin-bottom: 1rem;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.5rem;
}

#spanish-story p {
    margin: 0.8rem 0;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#spanish-story p:hover {
    background-color: #f0f0f0;
}

#spanish-story p:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

details {
    margin: 1rem 0;
    padding: 0.5rem;
    background-color: #fafafa;
    border: 1px solid #eee;
    border-radius: 4px;
}

summary {
    font-weight: bold;
    cursor: pointer;
    padding: 0.5rem;
    color: #005566;
}

summary:hover {
    background-color: #e6f3fa;
}

details p {
    margin: 0.5rem 1rem;
    font-size: 0.95rem;
    color: #444;
    cursor: pointer;
}

details p:hover {
    background-color: #f0f0f0;
}

details p:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* レスポンシブデザイン */
@media (max-width: 600px) {
    body {
        font-size: 14px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    header p.subtitle {
        font-size: 1rem;
    }

    main {
        padding: 0.5rem;
        margin: 0.5rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    #spanish-story p {
        font-size: 0.95rem;
    }

    details p {
        font-size: 0.9rem;
    }
}

@media (max-width: 375px) {
    body {
        font-size: 13px;
    }

    header {
        padding: 1rem 0.5rem;
    }

    main {
        margin: 0;
        border-radius: 0;
    }
}

/* 解説セクション */
.analysis-box {
    background-color: #fef9e7;
    border-left: 5px solid #f1c40f;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 0 5px 5px 0;
}

.analysis-box h3 {
    font-size: 1.2rem;
    color: #c0392b;
    margin-bottom: 0.8rem;
}

.analysis-box ul {
    list-style-type: none;
    padding-left: 0;
    margin-top: 1rem;
}

.analysis-box li {
    background-color: #fff;
    padding: 0.5rem;
    border-radius: 3px;
    margin-bottom: 0.5rem;
    font-family: "Courier New", Courier, monospace;
    font-size: 0.95rem;
}