/* ========================================
   Blog-specific styles for 電子署名くん
   Inherits design tokens from main.css
   ======================================== */

/* Blog Layout
   ========================================*/
.blog-container {
    width: min(880px, 100% - 48px);
    margin: 0 auto;
}

.blog-wide-container {
    width: min(1120px, 100% - 48px);
    margin: 0 auto;
}

/* Blog Header
   ========================================*/
.blog-header {
    padding: clamp(48px, 8vw, 80px) 0 clamp(32px, 5vw, 48px);
    text-align: center;
}

.blog-header h1 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 16px;
    line-height: 1.2;
}

.blog-header-description {
    font-size: clamp(16px, 2.5vw, 18px);
    color: var(--color-muted);
    margin: 0;
    line-height: 1.6;
}

/* Breadcrumb
   ========================================*/
.breadcrumb {
    padding: 24px 0;
    font-size: 14px;
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb-item::after {
    content: "›";
    color: var(--color-muted);
}

.breadcrumb-item:last-child::after {
    content: "";
}

.breadcrumb-link {
    color: var(--color-primary);
    text-decoration: none;
}

.breadcrumb-link:hover {
    text-decoration: underline;
}

.breadcrumb-current {
    color: var(--color-muted);
}

/* Collection Grid (Blog Top)
   ========================================*/
.collections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
    gap: clamp(24px, 4vw, 40px);
    margin-top: clamp(40px, 6vw, 64px);
}

.collection-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(28px, 4vw, 40px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.collection-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.collection-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.collection-title {
    font-size: clamp(20px, 3vw, 24px);
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 12px;
}

.collection-description {
    font-size: 15px;
    color: var(--color-muted);
    line-height: 1.6;
    margin: 0 0 24px;
}

.collection-articles {
    list-style: none;
    padding: 0;
    margin: 0 0 20px;
}

.collection-articles li {
    margin-bottom: 12px;
}

.collection-article-link {
    font-size: 15px;
    color: var(--color-primary);
    text-decoration: none;
    display: block;
    padding: 8px 0;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.collection-article-link:hover {
    border-bottom-color: var(--color-primary);
    text-decoration: none;
}

.collection-view-all {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.collection-view-all:hover {
    text-decoration: underline;
}

.collection-view-all::after {
    content: "→";
}

/* Collection Hub Page
   ========================================*/
.collection-hub-header {
    padding: clamp(48px, 8vw, 64px) 0 clamp(32px, 5vw, 48px);
}

.collection-hub-title {
    font-size: clamp(32px, 5vw, 42px);
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 16px;
    line-height: 1.2;
}

.collection-hub-description {
    font-size: clamp(16px, 2.5vw, 18px);
    color: var(--color-muted);
    line-height: 1.6;
    margin: 0 0 16px;
}

.collection-keywords {
    font-size: 14px;
    color: var(--color-muted);
    line-height: 1.6;
    margin: 0;
    padding: 12px 16px;
    background: rgba(27, 77, 255, 0.05);
    border-left: 3px solid var(--color-primary);
    border-radius: 4px;
}

.articles-list {
    display: grid;
    gap: clamp(20px, 3vw, 32px);
    margin-top: clamp(32px, 5vw, 48px);
}

.article-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(24px, 4vw, 32px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.article-card-title {
    font-size: clamp(20px, 3vw, 24px);
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 12px;
    line-height: 1.3;
}

.article-card-title a {
    color: inherit;
    text-decoration: none;
}

.article-card-title a:hover {
    color: var(--color-primary);
}

.article-card-excerpt {
    font-size: 15px;
    color: var(--color-muted);
    line-height: 1.6;
    margin: 0;
}

/* Article Content Page
   ========================================*/
.article-header {
    padding: clamp(48px, 8vw, 64px) 0 clamp(32px, 5vw, 48px);
}

.article-title {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 24px;
    line-height: 1.2;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 14px;
    color: var(--color-muted);
}

.article-content {
    background: var(--color-surface-strong);
    border-radius: var(--radius-lg);
    padding: clamp(32px, 5vw, 56px);
    box-shadow: var(--shadow-sm);
    margin-bottom: clamp(40px, 6vw, 64px);
}

.article-content h2 {
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 700;
    color: var(--color-text);
    margin: clamp(40px, 6vw, 56px) 0 clamp(16px, 2vw, 24px);
    line-height: 1.3;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 12px;
}

.article-content h2:first-child {
    margin-top: 0;
}

.article-content h3 {
    font-size: clamp(18px, 3vw, 22px);
    font-weight: 600;
    color: var(--color-text);
    margin: clamp(32px, 5vw, 40px) 0 clamp(12px, 2vw, 16px);
    line-height: 1.4;
}

.article-content p {
    font-size: clamp(15px, 2vw, 17px);
    color: var(--color-text);
    line-height: 1.8;
    margin: 0 0 clamp(16px, 2vw, 24px);
}

.article-content ul,
.article-content ol {
    font-size: clamp(15px, 2vw, 17px);
    color: var(--color-text);
    line-height: 1.8;
    margin: 0 0 clamp(16px, 2vw, 24px);
    padding-left: clamp(24px, 3vw, 32px);
}

.article-content li {
    margin-bottom: 8px;
}

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

.article-content a:hover {
    color: var(--color-primary-dark);
}

.article-content code {
    background: rgba(27, 77, 255, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "SF Mono", "Monaco", "Consolas", monospace;
    font-size: 0.9em;
}

.article-content pre {
    background: rgba(23, 33, 58, 0.04);
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 0 0 clamp(16px, 2vw, 24px);
}

.article-content pre code {
    background: none;
    padding: 0;
}

/* TL;DR Section (要点まとめ) - GEO Optimized
   ========================================*/
#summary.tldr,
.tldr {
    background: linear-gradient(135deg, rgba(27, 77, 255, 0.08), rgba(27, 77, 255, 0.04));
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: clamp(20px, 3vw, 28px);
    margin: 0 0 clamp(32px, 5vw, 48px);
}

.tldr-title {
    font-size: clamp(16px, 2.5vw, 18px);
    font-weight: 700;
    color: var(--color-primary);
    margin: 0 0 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tldr-title::before {
    content: "📌";
}

/* Support both <ul> and <p> structures for summary */
.tldr-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.tldr-list li,
#summary p {
    font-size: clamp(14px, 2vw, 16px);
    color: var(--color-text);
    line-height: 1.6;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.tldr-list li::before,
#summary p::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

#summary p:last-of-type {
    margin-bottom: 0;
}

/* Steps Section
   ========================================*/
.steps {
    counter-reset: step-counter;
    list-style: none;
    padding: 0;
    margin: clamp(24px, 4vw, 32px) 0;
}

.steps li {
    counter-increment: step-counter;
    position: relative;
    padding-left: clamp(48px, 6vw, 64px);
    margin-bottom: clamp(24px, 4vw, 32px);
}

.steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: clamp(32px, 5vw, 40px);
    height: clamp(32px, 5vw, 40px);
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: clamp(16px, 2.5vw, 18px);
}

/* Error Section
   ========================================*/
.errors {
    background: rgba(255, 77, 77, 0.05);
    border-left: 4px solid #ff4d4d;
    border-radius: var(--radius-md);
    padding: clamp(20px, 3vw, 28px);
    margin: clamp(24px, 4vw, 32px) 0;
}

.errors h3 {
    color: #d93636;
    margin-top: 0 !important;
}

.error-item {
    margin-bottom: 20px;
}

.error-item:last-child {
    margin-bottom: 0;
}

.error-message {
    background: rgba(255, 77, 77, 0.1);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-family: "SF Mono", "Monaco", "Consolas", monospace;
    font-size: 14px;
    color: #d93636;
    margin: 8px 0;
}

.error-solution {
    font-weight: 600;
    color: var(--color-text);
}

/* FAQ Section - GEO Optimized
   ========================================*/
#faq {
    margin: clamp(32px, 5vw, 48px) 0;
}

#faq h2 {
    font-size: clamp(20px, 3vw, 24px);
    margin-bottom: clamp(20px, 3vw, 24px);
}

.faq-item {
    background: rgba(77, 90, 119, 0.04);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: clamp(16px, 2.5vw, 20px);
    margin-bottom: 16px;
    line-height: 1.6;
}

.faq-item strong {
    color: var(--color-primary);
    font-weight: 600;
}

.faq-item .answer {
    display: block;
    margin-top: 8px;
    color: var(--color-text);
}

/* References Section - GEO Optimized
   ========================================*/
#references,
.references {
    background: rgba(77, 90, 119, 0.04);
    border-radius: var(--radius-md);
    padding: clamp(20px, 3vw, 28px);
    margin: clamp(32px, 5vw, 48px) 0;
}

#references h2,
.references h2 {
    margin-top: 0 !important;
}

#references ul,
.references ul {
    list-style: none;
    padding: 0;
}

#references li,
.references li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
}

#references li::before,
.references li::before {
    content: "🔗";
    position: absolute;
    left: 0;
}

.references a {
    word-break: break-word;
}

/* CTA Section (matches homepage style)
   ========================================*/
.article-cta {
    padding: 40px;
    border-radius: var(--radius-xl);
    background: rgba(30, 72, 180, 0.08);
    border: 1px solid rgba(27, 77, 255, 0.2);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.article-cta h3 {
    font-size: clamp(1.8rem, 3.2vw, 2.4rem);
    font-weight: 700;
    margin: 0 0 14px;
    color: var(--color-text);
}

.article-cta p {
    font-size: 1.02rem;
    line-height: 1.6;
    margin: 0 0 24px;
    color: var(--color-muted);
}

.cta-button {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.cta-button:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

/* CTA Section on hub pages and blog index - matches homepage section-cta */
.section-cta {
    padding-bottom: clamp(72px, 12vw, 120px);
}

.section-cta .cta-container {
    display: grid;
    gap: 32px;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    align-items: center;
    padding: 40px;
    border-radius: var(--radius-xl);
    background: rgba(30, 72, 180, 0.08);
    border: 1px solid rgba(27, 77, 255, 0.2);
    box-shadow: var(--shadow-md);
}

.section-cta .cta-text h2 {
    margin: 0 0 14px;
    font-size: clamp(1.8rem, 3.2vw, 2.4rem);
    color: var(--color-text);
}

.section-cta .cta-text p {
    margin: 0 0 24px;
    color: var(--color-muted);
    font-size: 1.02rem;
}

.section-cta .cta-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .article-cta,
    .section-cta .cta-container {
        padding: 28px 24px;
    }
}

/* Responsive
   ========================================*/
@media (max-width: 768px) {
    .collections-grid {
        grid-template-columns: 1fr;
    }

    .breadcrumb {
        font-size: 13px;
    }

    .article-content {
        padding: clamp(20px, 5vw, 32px);
    }
}