:root {
    --pico-font-family: "Inter", "Noto Sans JP", system-ui, sans-serif;
    --pico-line-height: 1.6;
    --pico-primary: #ea580c;
    --pico-primary-background: #ea580c;
    --pico-primary-hover: #c2410c;
    --pico-primary-underline: rgba(234, 88, 12, 0.5);
    --pico-border-radius: 4px;
    --pico-background-color: #ffffff;
    --pico-card-background-color: #ffffff;
    --pico-muted-border-color: #334155;
    --pico-color: #020617;
    --pico-muted-color: #475569;
}

[data-theme="dark"] {
    --pico-background-color: #0f172a;
    --pico-card-background-color: #0f172a;
    --pico-primary: #f97316;
    --pico-primary-background: #f97316;
    --pico-muted-border-color: #64748b;
    --pico-color: #f8fafc;
    --pico-muted-color: #cbd5e1;
}

* {
    box-sizing: border-box;
}

body {
    font-weight: 500;
}

body > header {
    padding: 0.1rem 0;
    background-color: var(--pico-background-color);
    border-bottom: 2px solid var(--pico-muted-border-color);
    margin-bottom: 3rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-nav {
    margin: 0;
}

.site-nav ul {
    align-items: center;
    gap: 0.75rem;
}

.brand-title {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--pico-color);
    text-decoration: none;
}

.layout-grid {
    display: grid;
    gap: 4rem;
}

.layout-grid > * {
    min-width: 0;
}

@media (min-width: 992px) {
    .layout-grid {
        grid-template-columns: 1fr 300px;
        align-items: start;
    }

    .layout-grid aside {
        position: sticky;
        top: 6.5rem;
    }
}

.layout-grid.layout-single {
    max-width: 740px;
    margin: 0 auto;
    grid-template-columns: 1fr;
}

.section-title {
    font-size: 1.4rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 4px solid var(--pico-primary);
    color: var(--pico-color);
}

.profile-card {
    text-align: left;
    border: 2px solid var(--pico-muted-border-color);
    padding: 1.5rem;
    background-color: var(--pico-background-color);
    box-shadow: 4px 4px 0 var(--pico-muted-border-color);
}

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

.profile-img {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--pico-muted-border-color);
}

.profile-name {
    border: 0;
    margin-bottom: 0.2rem;
    font-weight: 900;
    font-size: 1.2rem;
    color: var(--pico-color);
}

.profile-id {
    color: var(--pico-muted-color);
    font-weight: 600;
    font-size: 0.85rem;
}

.profile-bio {
    font-size: 0.9rem;
    color: var(--pico-color);
    margin-bottom: 1rem;
    line-height: 1.6;
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--pico-muted-border-color);
}

.social-links a:hover {
    color: var(--pico-primary);
}

.theme-toggle {
    background: none;
    border: none;
    padding: 0.5rem;
    color: var(--pico-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--pico-primary);
    outline-offset: 2px;
}

.site-footer {
    margin-top: 4rem;
    padding: 3rem 0;
    border-top: 2px solid var(--pico-muted-border-color);
    text-align: center;
    color: var(--pico-muted-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.blog-list {
    display: block;
}

.blog-post {
    background: transparent;
    border: 2px solid var(--pico-muted-border-color);
    box-shadow: 4px 4px 0 var(--pico-muted-border-color);
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: all 0.2s;
}

.blog-post:hover {
    border-color: var(--pico-primary);
    transform: translateY(-2px);
}

.post-thumbnail {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--pico-border-radius);
    border: 2px solid var(--pico-muted-border-color);
    transition: all 0.2s ease;
    display: block;
    overflow: hidden;
}

.post-thumbnail-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.post-thumbnail-visual {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
    background-color: #f1f5f9;
}

.blog-post:hover .post-thumbnail {
    opacity: 0.9;
    border-color: var(--pico-primary);
    box-shadow: 4px 4px 0 var(--pico-muted-border-color);
}

.post-content {
    flex: 1;
    min-width: 0;
    margin-top: 1rem;
    margin-right: 1rem;
}

.post-meta {
    color: var(--pico-muted-color);
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    gap: 0.8rem;
    align-items: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-separator {
    color: var(--pico-muted-border-color);
}

.post-category {
    color: var(--pico-primary);
}

.post-title {
    margin-bottom: 0.8rem;
    font-weight: 900;
    line-height: 1.3;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    color: var(--pico-color);
}

.post-title-link {
    text-decoration: none;
    color: inherit;
}

.post-title-link:hover {
    color: var(--pico-primary);
    text-decoration: underline;
    text-decoration-thickness: 3px;
}

.post-excerpt {
    color: var(--pico-color);
    font-size: 0.95rem;
    font-weight: 500;
    opacity: 0.9;
}

.read-more {
    display: inline-block;
    margin-top: 0.5rem;
    font-weight: 800;
    text-decoration: none;
    font-size: 0.9rem;
    color: var(--pico-primary);
    border-bottom: 3px solid transparent;
}

.read-more:hover {
    border-bottom-color: var(--pico-primary);
    text-decoration: none;
}

.empty-state {
    padding: 2rem;
    text-align: center;
    border: 2px dashed var(--pico-muted-border-color);
}

.pager-nav ul {
    justify-content: center;
}

.article-shell {
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
}

.article-header {
    margin-bottom: 3rem;
    text-align: center;
    background-color: white;
}

.article-meta {
    color: var(--pico-muted-color);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.article-separator {
    color: var(--pico-muted-border-color);
}

.article-category {
    color: var(--pico-primary);
}

.article-title {
    font-size: 2.2rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 2rem;
    color: var(--pico-color);
    word-break: auto-phrase;
}

.article-thumbnail-wrapper {
    margin: 0 0 4rem;
}

.article-thumbnail {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--pico-border-radius);
    border: 2px solid var(--pico-muted-border-color);
    box-shadow: 6px 6px 0 var(--pico-muted-border-color);
    background-color: var(--pico-muted-border-color);
    display: block;
}

.entry-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--pico-color);
}

.entry-content p {
    margin-bottom: 1.8rem;
}

.entry-content img {
    max-width: 100%;
    height: auto;
    display: block;
}

.entry-content h2 {
    margin-top: 4rem;
    margin-bottom: 1.5rem;
    font-size: 1.6rem;
    font-weight: 900;
    border-bottom: 3px solid var(--pico-muted-border-color);
    padding-bottom: 0.5rem;
    color: var(--pico-color);
}

.entry-content h3 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--pico-color);
    display: flex;
    align-items: center;
}

.entry-content h3::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 1.2em;
    background-color: var(--pico-primary);
    margin-right: 0.8rem;
    border-radius: 2px;
}

.entry-content blockquote {
    background-color: var(--pico-background-color);
    border: 2px solid var(--pico-muted-border-color);
    padding: 1.5rem 2rem;
    font-style: italic;
    border-radius: var(--pico-border-radius);
    margin: 2rem 0;
    box-shadow: 4px 4px 0 var(--pico-muted-border-color);
    font-weight: 600;
}

.entry-content blockquote cite {
    display: block;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--pico-muted-color);
    font-weight: 700;
    font-style: normal;
}

.entry-content pre {
    border-radius: var(--pico-border-radius);
    border: 2px solid var(--pico-muted-border-color);
    background-color: #1e293b;
    color: #f8fafc;
    padding: 1.5rem;
    margin: 2rem 0;
    font-weight: 500;
    max-width: 100%;
    overflow-x: auto;
}

.entry-content .highlight {
    max-width: 100%;
    overflow-x: auto;
}

.entry-content .highlight pre {
    margin: 0;
}

.entry-content ul {
    padding-left: 1.5rem;
    margin-bottom: 2rem;
}

.entry-content li {
    margin-bottom: 0.5rem;
}

.entry-content li::marker {
    color: var(--pico-primary);
    font-weight: 700;
}

.article-footer {
    margin-top: 6rem;
    padding-top: 2rem;
    border-top: 2px solid var(--pico-muted-border-color);
    background-color: white;
}

.tags-list {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tag-badge {
    font-size: 0.85rem;
    color: var(--pico-primary);
    text-decoration: none;
    font-weight: 800;
    background-color: transparent;
    border: 2px solid var(--pico-primary);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.tag-badge:hover {
    background-color: var(--pico-primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 3px 3px 0 var(--pico-muted-border-color);
}

.back-to-index {
    border-width: 2px;
    font-weight: 700;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 767px) {
    .site-nav ul {
        gap: 0.5rem;
    }
}

@media (min-width: 768px) {
    .blog-post {
        flex-direction: row;
        align-items: flex-start;
        gap: 2rem;
        padding: 0;
        border: 2px solid var(--pico-muted-border-color);
        box-shadow: 4px 4px 0 var(--pico-muted-border-color);
        padding-bottom: 2rem;
        margin-bottom: 3rem;
        transform: none;
    }

    .blog-post:hover {
        border-color: var(--pico-muted-border-color);
    }

    .post-thumbnail {
        margin: 1rem;
        width: 240px;
        flex-shrink: 0;
    }
}