/* ==========================================================================
   Blog Styles
   ========================================================================== */

/* Blog Filter */
.blog-filter {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
    justify-content: center;
}

.blog-filter__item {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.blog-filter__item:hover,
.blog-filter__item.is-active {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

/* ==========================================================================
   Blog Single
   ========================================================================== */

.blog-single {
    padding: var(--space-3xl) 0;
}

.blog-single__header {
    margin-bottom: var(--space-2xl);
}

.blog-single__categories {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.blog-single__title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-md);
    line-height: 1.3;
}

.blog-single__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.blog-single__date--updated {
    color: var(--color-success);
}

.blog-single__thumbnail {
    margin-bottom: var(--space-2xl);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.blog-single__thumbnail img {
    width: 100%;
    height: auto;
}

/* ==========================================================================
   Entry Content (article body)
   ========================================================================== */

.entry-content {
    font-size: 16px;
    line-height: 1.85;
    color: var(--color-gray-900);
    max-width: 780px;
    margin: 0 auto;
}

/* --- H2: 左ボーダー + 背景 --- */
.entry-content h2 {
    font-size: 22px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-gray-900);
    background-color: var(--color-primary-bg);
    border-left: 5px solid var(--color-primary-dark);
    padding: 14px 20px;
    margin-top: 60px;
    margin-bottom: 28px;
    border-radius: 0;
}

/* --- H3: 下ボーダー付きサブ見出し --- */
.entry-content h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-gray-900);
    padding-bottom: 10px;
    margin-top: 44px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--color-primary-pale);
    border-left: none;
    padding-left: 0;
}

/* --- H4 --- */
.entry-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    color: var(--color-gray-900);
}

/* --- mark: BMW Blue tint marker --- */
.entry-content mark {
    background: linear-gradient(transparent 60%, rgba(28, 105, 212, 0.15) 60%);
    font-weight: 700;
    color: inherit;
    padding: 0 2px;
}

/* --- 段落 --- */
.entry-content p {
    margin-bottom: 24px;
    letter-spacing: 0.02em;
}

/* --- リスト --- */
.entry-content ul,
.entry-content ol {
    margin: 20px 0;
    padding-left: 28px;
}

.entry-content ul {
    list-style: disc;
}

.entry-content ol {
    list-style: decimal;
}

.entry-content li {
    margin-bottom: 8px;
    line-height: 1.85;
}

/* --- 引用 --- */
.entry-content blockquote {
    margin: 32px 0;
    padding: 20px 24px;
    background-color: var(--color-gray-50);
    border-left: 4px solid #1c69d4;
    border-radius: 0;
    font-style: italic;
    color: var(--color-gray-700);
}

/* --- テーブル --- */
.entry-content table {
    width: 100%;
    margin: 28px 0;
    border-collapse: collapse;
    border: 1px solid var(--color-gray-300);
}

.entry-content th,
.entry-content td {
    padding: 10px 16px;
    border: 1px solid var(--color-gray-300);
    text-align: left;
    font-size: 14px;
}

.entry-content th {
    background-color: var(--color-gray-50);
    font-weight: 600;
}

/* --- 画像 --- */
.entry-content img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 0;
    margin: 28px 0;
}

/* WordPress figure / caption */
.entry-content figure {
    margin: 28px 0;
    max-width: 100%;
}

.entry-content figure img {
    margin: 0 0 8px;
}

.entry-content figcaption {
    font-size: 13px;
    color: var(--color-gray-500);
    text-align: center;
}

/* --- リンク --- */
.entry-content a {
    color: var(--color-cta);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.entry-content a:hover {
    color: var(--color-cta-hover);
}

/* --- 記事内CTA (最後のセクション用) --- */
.entry-content h2 + h3 + mark + a[href*="contact"] {
    font-weight: 700;
}

/* ==========================================================================
   TOC (目次)
   ========================================================================== */

.toc {
    background-color: var(--color-gray-50);
    border: 1px solid var(--color-gray-300);
    border-radius: 0;
    padding: 20px 24px;
    margin-bottom: 40px;
    max-width: 520px;
    font-size: 14px;
    line-height: 1.5;
}

.toc__header {
    margin-bottom: 12px;
}

.toc__toggle {
    background: none;
    border: none;
    font-size: 15px;
    font-weight: 700;
    color: var(--color-gray-900);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 6px;
}

.toc__toggle::after {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--color-gray-500);
    border-bottom: 2px solid var(--color-gray-500);
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
    margin-left: 4px;
}

.toc__toggle[aria-expanded="false"]::after {
    transform: rotate(-45deg);
}

/* ul/liのリセット */
.entry-content .toc ul,
.entry-content .toc li,
.toc ul,
.toc li {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.toc__list {
    counter-reset: toc-h2;
}

.toc__item--h2 {
    counter-increment: toc-h2;
    margin-bottom: 6px;
}

.toc__item--h2 > .toc__link {
    font-weight: 600;
    color: var(--color-gray-900);
    font-size: 14px;
    text-decoration: none;
    display: block;
    padding: 3px 0;
    border-bottom: none;
}

.toc__item--h2 > .toc__link::before {
    content: counter(toc-h2) ". ";
    color: var(--color-primary-muted);
    font-weight: 700;
}

.toc__item--h2 > .toc__link:hover {
    color: var(--color-primary-dark);
}

.toc__sublist {
    padding-left: 20px;
    margin: 2px 0 8px;
    counter-reset: toc-h3;
}

.toc__item--h3 {
    counter-increment: toc-h3;
    margin-bottom: 2px;
}

.toc__item--h3 > .toc__link {
    font-weight: 400;
    color: var(--color-gray-700);
    font-size: 13px;
    text-decoration: none;
    display: block;
    padding: 2px 0;
}

.toc__item--h3 > .toc__link::before {
    content: counter(toc-h3) ". ";
    color: var(--color-gray-500);
}

.toc__item--h3 > .toc__link:hover {
    color: var(--color-primary-dark);
}

.toc__list.is-hidden {
    display: none;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 767px) {
    .blog-single__title {
        font-size: var(--font-size-xl);
    }

    .entry-content {
        font-size: 15px;
    }

    .entry-content h2 {
        font-size: 19px;
        padding: 12px 16px;
        margin-top: 44px;
        margin-bottom: 20px;
    }

    .entry-content h3 {
        font-size: 17px;
        margin-top: 36px;
        margin-bottom: 16px;
    }

    .toc {
        padding: 16px 18px;
        max-width: 100%;
        font-size: 13px;
    }

    .toc__item--h3 > .toc__link {
        font-size: 12px;
    }
}