/* Main Stylesheet - Clean White Design */

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    text-align: center;
    padding: 3rem 1rem;
    background: var(--color-bg-gray);
    border-radius: var(--radius);
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.hero-tagline {
    color: var(--color-text-light);
    font-size: 1rem;
}

@media (min-width: 768px) {
    .hero {
        padding: 4rem 2rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}

/* ========================================
   SECTIONS
   ======================================== */
.section {
    margin-bottom: 3rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.section-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.section-link {
    color: var(--color-primary);
    font-size: 0.875rem;
}

/* ========================================
   ARTICLE GRID
   ======================================== */
.article-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 640px) {
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .article-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ========================================
   ARTICLE CARDS
   ======================================== */
.article-card {
    background: var(--color-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: box-shadow 0.2s;
}

.article-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.article-card-image img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.article-card-content {
    padding: 1rem;
}

.article-card-content h2,
.article-card-content h3 {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.article-card-content h2:hover,
.article-card-content h3:hover {
    color: var(--color-primary);
}

.article-card-content p {
    color: var(--color-text-light);
    font-size: 0.875rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-meta {
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* ========================================
   PILLAR CARDS (Featured)
   ======================================== */
.pillar-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 768px) {
    .pillar-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.pillar-card {
    display: block;
    background: var(--color-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 2px solid var(--color-primary);
    transition: box-shadow 0.2s;
}

.pillar-card:hover {
    box-shadow: 0 4px 16px rgba(220, 38, 38, 0.15);
    text-decoration: none;
}

.pillar-card img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.pillar-content {
    padding: 1.25rem;
}

.pillar-content h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.pillar-content p {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* ========================================
   BREADCRUMB
   ======================================== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-text-light);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

/* ========================================
   ARTICLE PAGE
   ======================================== */
.article-page {
    max-width: 760px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 2rem;
}

.article-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 1rem;
    color: var(--color-text);
}

@media (min-width: 768px) {
    .article-header h1 {
        font-size: 2rem;
    }
}

.article-meta {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 640px) {
    .article-meta {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.author-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9rem;
}

.author-title {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-light);
}

.article-dates {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

/* ========================================
   KEY TAKEAWAYS (GEO/AEO)
   ======================================== */
.key-takeaways {
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 2rem;
}

.key-takeaways h2 {
    font-size: 0.9rem;
    font-weight: 700;
    color: #92400e;
    margin-bottom: 0.75rem;
}

.key-takeaways ul {
    list-style: none;
    padding: 0;
}

.key-takeaways li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.4rem;
    color: #78350f;
    font-size: 0.9rem;
}

.key-takeaways li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #d97706;
    font-weight: bold;
}

/* ========================================
   ARTICLE CONTENT
   ======================================== */
.article-content {
    line-height: 1.85;
    font-size: 1rem;
}

.article-content h2 {
    font-size: 1.375rem;
    font-weight: 700;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
    color: var(--color-text);
}

.article-content h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin: 2rem 0 0.75rem;
    color: var(--color-text);
    padding-left: 0.75rem;
    border-left: 4px solid var(--color-primary);
}

.article-content p {
    margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.4rem;
}

.article-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: 1rem;
    margin: 1.5rem 0;
    color: var(--color-text-light);
    font-style: italic;
}

/* Tables */
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
    background: var(--color-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.article-content thead {
    background: var(--color-bg-gray);
}

.article-content th {
    padding: 0.875rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
}

.article-content th:not(:first-child) {
    text-align: center;
}

.article-content td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

.article-content td:not(:first-child) {
    text-align: center;
}

.article-content tbody tr:last-child td {
    border-bottom: none;
}

.article-content tbody tr:hover {
    background: var(--color-bg-gray);
}

/* Make table responsive on mobile */
@media (max-width: 640px) {
    .article-content table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .article-content th,
    .article-content td {
        padding: 0.625rem 0.75rem;
        white-space: nowrap;
    }
}

.article-content pre {
    background: var(--color-bg-gray);
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin-bottom: 1.25rem;
    border: 1px solid var(--color-border);
}

.article-content code {
    font-family: 'SF Mono', Consolas, monospace;
    font-size: 0.875rem;
}

.article-content :not(pre) > code {
    background: var(--color-bg-gray);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

/* Images */
.article-content figure.article-image {
    margin: 1.5rem auto;  /* 中央揃え */
    max-width: 600px;     /* 最大幅を制限 */
}

.article-content figure.article-image img {
    max-width: 100%;      /* figureの幅に収まるように */
    height: auto;
    display: block;
    margin: 0 auto;       /* 画像自体も中央揃え */
}

.article-content .responsive-img {
    border-radius: var(--radius);
}

.article-content figcaption {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 0.5rem;
}

/* Internal links */
.article-content .internal-link {
    color: var(--color-primary);
    font-weight: 500;
}

.article-content .broken-link {
    color: var(--color-text-light);
    text-decoration: line-through;
}

/* ========================================
   TABLE OF CONTENTS
   ======================================== */
.toc-container {
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-bottom: 2rem;
}

.toc-container h2 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toc-container ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-container li {
    margin-bottom: 0.4rem;
}

.toc-container a {
    color: var(--color-text);
    font-size: 0.9rem;
}

.toc-container a:hover {
    color: var(--color-primary);
}

/* ========================================
   FAQ SECTION
   ======================================== */
.faq-section {
    margin: 3rem 0;
}

.faq-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.faq-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-item summary {
    padding: 1rem;
    cursor: pointer;
    font-weight: 500;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.25rem;
    color: var(--color-text-light);
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-item[open] {
    background: var(--color-bg-gray);
}

.faq-answer {
    padding: 0 1rem 1rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ========================================
   TAGS
   ======================================== */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 2rem 0;
}

.tag {
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

/* ========================================
   RELATED ARTICLES
   ======================================== */
.related-articles {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.related-articles h2 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

/* ========================================
   CATEGORY PAGE
   ======================================== */
.category-header,
.tag-header {
    margin-bottom: 2rem;
}

.category-header h1,
.tag-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.category-description {
    color: var(--color-text-light);
    max-width: 600px;
    margin-bottom: 0.75rem;
}

.category-count,
.tag-count {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ========================================
   AUTHOR PROFILE
   ======================================== */
.author-profile {
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.author-profile-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    text-align: center;
}

@media (min-width: 640px) {
    .author-profile-header {
        flex-direction: row;
        text-align: left;
    }
}

.author-profile-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
}

.author-profile-info h1 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.author-profile-title {
    color: var(--color-text-light);
}

.author-profile-bio {
    margin-bottom: 1rem;
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

.author-expertise h2 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.expertise-tag {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

/* ========================================
   EMPTY STATE
   ======================================== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--color-text-light);
}

/* ========================================
   UTILITIES
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   MARKDOWN EXTENSIONS
   ======================================== */

/* Admonitions */
.admonition {
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--color-border);
    background: var(--color-bg-gray);
}

.admonition-title {
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: block;
}

.admonition.warning {
    background: #fffbeb;
    border-left-color: #f59e0b;
}

.admonition.warning .admonition-title {
    color: #92400e;
}

.admonition.tip {
    background: #eff6ff;
    border-left-color: #3b82f6;
}

.admonition.tip .admonition-title {
    color: #1e40af;
}

.admonition.note {
    background: #f3f4f6;
    border-left-color: #6b7280;
}

/* CTA Button */
.cta-button {
    display: inline-block;
    background: #ef4444; /* Red accent */
    color: white !important;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-weight: 700;
    text-decoration: none !important;
    margin: 1.5rem 0;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px rgba(239, 68, 68, 0.25);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(239, 68, 68, 0.3);
    background: #dc2626;
}

/* Featured Image */
.article-featured-image {
    margin: -1rem 0 2rem;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.article-featured-image img {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16/9;
    object-fit: cover;
}

/* ========================================
   CJK TYPOGRAPHY (禁則処理)
   ======================================== */
.article-content,
.article-content p,
.article-content li {
    word-break: normal;
    overflow-wrap: anywhere;
    line-break: strict;  /* 禁則処理: 句読点を行頭に置かない */
    font-family: var(--font-sans);  /* CJKフォントを確実に適用 */
    text-rendering: optimizeLegibility;
}

/* 繁体中文の句読点位置修正 */
html[lang="zh-TW"] .article-content {
    font-feature-settings: "locl" 1, "palt" 1; /* 繁体字向け字形 */
    font-variant-east-asian: traditional;
    font-synthesis: none;
}