/* ===== ヘッダー下の余白 ===== */
.single-spacer {
    height: 120px;
    background: #fff;
}

/* ===== 記事コンテンツ ===== */
.single-content {
    max-width: 800px;
    margin: 0 auto;
    padding-top: 48px;
    padding-bottom: 80px;
}

.single-date {
    font-family: 'Jost', sans-serif;
    font-size: 0.875rem;
    color: #999;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.single-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 700;
    color: #1a1a1a;
    line-height: 1.6;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 3px solid #ff6600;
}

/* ===== 本文 ===== */
.single-body {
    font-size: 0.9375rem;
    color: #333;
    line-height: 2;
    margin-bottom: 64px;
}

.single-body p {
    margin-bottom: 1.5em;
}

.single-body h2 {
    font-size: 1.375rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-top: 48px;
    margin-bottom: 16px;
    padding-left: 16px;
    border-left: 4px solid #ff6600;
}

.single-body h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-top: 40px;
    margin-bottom: 12px;
}

.single-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 24px 0;
    display: block;
}

.single-body ul,
.single-body ol {
    padding-left: 24px;
    margin-bottom: 1.5em;
}

.single-body li {
    margin-bottom: 8px;
    line-height: 1.8;
}

.single-body a {
    color: #ff6600;
    text-decoration: underline;
    transition: opacity 0.3s ease;
}

.single-body a:hover {
    opacity: 0.7;
}

.single-body blockquote {
    border-left: 4px solid #ddd;
    padding: 16px 20px;
    margin: 24px 0;
    background: #fafafa;
    border-radius: 4px;
    color: #555;
    font-style: italic;
}

.single-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
}

.single-body table th,
.single-body table td {
    border: 1px solid #ddd;
    padding: 12px 16px;
    font-size: 0.875rem;
    text-align: left;
}

.single-body table th {
    background: #fafafa;
    font-weight: 700;
}

/* ===== 戻るボタン ===== */
.single-back {
    text-align: center;
}

.single-back-btn {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 700;
    color: #fff;
    background: #ff6600;
    padding: 14px 40px;
    border-radius: 50px;
    text-decoration: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    box-shadow: 0 4px 16px rgba(255, 102, 0, 0.3);
}

.single-back-btn:hover {
    opacity: 0.8;
    transform: translateY(-2px);
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
    .single-spacer {
        height: 80px;
    }

    .single-content {
        padding-top: 32px;
        padding-bottom: 60px;
    }

    .single-title {
        margin-bottom: 32px;
        padding-bottom: 20px;
    }

    .single-body {
        font-size: 0.875rem;
        margin-bottom: 48px;
    }

    .single-body h2 {
        font-size: 1.2rem;
        margin-top: 36px;
    }

    .single-body h3 {
        font-size: 1rem;
        margin-top: 28px;
    }

    .single-back-btn {
        padding: 12px 32px;
        font-size: 0.8rem;
    }
}