@view-transition {
  navigation: auto;
}

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --accent: #2563eb;
    --border: #e5e7eb;
    --icon-stroke: #6b7280;
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --accent: #60a5fa;
    --border: #374151;
    --icon-stroke: #9ca3af;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

button {
    background: none;
    border: none;
    cursor: pointer;
    font: inherit;
    color: inherit;
}

#skip-to-content {
    position: absolute;
    top: -100px;
    left: 16px;
    z-index: 50;
    background: var(--bg-primary);
    color: var(--accent);
    padding: 8px 12px;
    border-radius: 4px;
    transition: top 0.2s;
}

#skip-to-content:focus {
    top: 16px;
}

#nav-container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 16px;
}

#top-nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 16px 0;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 600;
    white-space: nowrap;
}

#nav-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#menu-btn {
    display: none;
    padding: 8px;
}

#menu-btn .icon {
    display: block;
}

#menu-items {
    display: flex;
    gap: 20px;
    align-items: center;
}

#menu-items li a,
#menu-items li button {
    padding: 4px 8px;
    font-weight: 500;
    transition: color 0.2s;
}

#menu-items li a:hover,
#menu-items li button:hover {
    color: var(--accent);
}

#menu-items li a.active {
    text-decoration: underline dashed var(--accent);
    text-underline-offset: 8px;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

@media (min-width: 641px) {
    #menu-items {
        display: flex !important;
    }
}

@media (max-width: 640px) {
    #menu-btn {
        display: block;
        align-self: flex-end;
    }

    #menu-items {
        display: none;
        flex-direction: column;
        width: 176px;
        margin-top: 16px;
        gap: 8px;
    }

    #menu-items:not(.hidden) {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    #menu-items li a {
        display: block;
        text-align: center;
        padding: 12px;
    }

    #menu-items li .icon-btn {
        padding: 12px;
    }
}

#theme-btn {
    position: relative;
    width: 48px;
    height: 48px;
    transition: background-color 0.3s ease;
}

@media (max-width: 640px) {
    #theme-btn {
        width: 48px;
        height: 48px;
    }
}

#theme-btn svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.sun-icon {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

.moon-icon {
    opacity: 0;
    transform: scale(0) rotate(-90deg);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: scale(0) rotate(90deg);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

.divider {
    max-width: 860px;
    margin: 0 auto;
    border: 0;
    border-top: 1px solid var(--border);
}

main {
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
    padding: 0 16px;
}

#hero {
    padding-top: 24px;
    padding-bottom: 16px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

@media (min-width: 640px) {
    .hero-content {
        flex-direction: row;
        align-items: flex-start;
    }
}

.avatar-link {
    display: block;
    margin: 0 auto;
    transition: transform 0.3s, box-shadow 0.3s;
}

.avatar-link:hover .avatar {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.avatar-placeholder {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

.hero-text {
    flex: 1;
    text-align: center;
}

@media (min-width: 640px) {
    .hero-text {
        text-align: left;
        padding-left: 16px;
    }
}

.title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

@media (min-width: 640px) {
    .title-row {
        justify-content: flex-start;
    }
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 8px 0;
}

@media (min-width: 640px) {
    h1 {
        font-size: 1.875rem;
        margin: 16px 0;
    }
}

.rss-link svg {
    stroke: var(--accent);
    stroke-width: 3;
    transform: scale(1.25);
}

.hero-text p {
    opacity: 0.8;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-top: 16px;
    flex-wrap: wrap;
}

@media (min-width: 640px) {
    .social-links {
        justify-content: flex-start;
    }
}

.social-link {
    display: inline-block;
    padding: 8px;
    transition: transform 0.2s, color 0.2s;
}

.social-link:hover {
    color: var(--accent);
    transform: rotate(6deg);
}

.social-link svg {
    display: inline-block;
    width: 24px;
    height: 24px;
    transform: scale(1.25);
    opacity: 0.9;
}

@media (max-width: 640px) {
    .social-link svg {
        transform: scale(1.25);
    }
}

#recent-posts {
    padding-top: 48px;
    padding-bottom: 24px;
}

#recent-posts ul li {
    margin: 32px 0;
}

.post-item h3 {
    font-size: 1.125rem;
    font-weight: 500;
    text-decoration: dashed;
    text-underline-offset: 4px;
}

.post-link {
    display: inline-block;
    color: var(--accent);
    text-decoration: dashed;
}

.post-link:hover {
    text-decoration: underline;
    text-underline-offset: 4px;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.post-meta .date {
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.8;
}

.post-meta svg {
    display: inline-block;
    width: 20px;
    height: 20px;
    min-width: 20px;
}

@media (max-width: 640px) {
    .post-meta svg {
        width: 16px;
        height: 16px;
        min-width: 16px;
    }
}

.post-meta time {
    font-size: 0.875rem;
    font-style: italic;
}

.read-time {
    font-size: 0.875rem;
    font-style: italic;
    opacity: 0.8;
}

.post-item > p {
    opacity: 0.8;
    flex: 1;
}

.all-posts-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 32px 0;
}

.all-posts-link a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: inherit;
    transition: color 0.2s;
}

.all-posts-link a:hover {
    color: var(--accent);
}

.all-posts-link svg {
    display: inline-block;
    vertical-align: middle;
}

.post-nav-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 32px 0;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: inherit;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent);
}

.post-nav-links {
    display: flex;
    gap: 8px;
}

footer {
    width: 100%;
    max-width: 860px;
    margin: auto auto 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 24px 16px;
}

@media (min-width: 640px) {
    .footer-content {
        flex-direction: row-reverse;
        padding: 16px 0;
    }
}

.footer-credit {
    display: flex;
    align-items: center;
    white-space: nowrap;
    margin-top: 8px;
    gap: 16px;
}

.footer-credit a {
    transition: color 0.2s;
}

.footer-credit a:hover {
    color: var(--accent);
}

.hidden {
    display: none !important;
}

.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-content {
    line-height: 1.7;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.markdown-content p {
    margin-bottom: 1em;
}

.markdown-content strong {
    font-weight: 700;
}

.markdown-content em {
    font-style: italic;
}

.markdown-content u {
    text-decoration: underline;
}

.markdown-content a {
    color: var(--link);
}

.markdown-content a:hover {
    text-decoration: underline;
}

.markdown-content code {
    font-family: 'Fira Code', monospace;
    background: var(--bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

.markdown-content pre {
    background: var(--bg-secondary);
    padding: 1em;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1em 0;
}

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

.markdown-content blockquote {
    border-left: 4px solid var(--border);
    padding-left: 1em;
    margin: 1em 0;
    font-style: italic;
    color: var(--text-secondary);
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1em 0;
}

.markdown-content ul,
.markdown-content ol {
    padding-left: 1.5em;
    margin: 1em 0;
}

.markdown-content li {
    margin-bottom: 0.5em;
}

.markdown-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2em 0;
}

.post-header {
    margin-bottom: 2em;
}

.post-header h1 {
    margin-bottom: 0.5em;
}

.page-content {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 0rem;
}

.page-content h1 {
    margin-bottom: 1.5rem;
}

.page-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.search-page {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 0rem;
}

.search-page h1 {
    margin-bottom: 1.5rem;
}

.search-form {
    margin-bottom: 2rem;
}

.search-form input {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-form input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

#search-results {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

#search-empty {
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
}

#all-posts {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 0rem;
}

#all-posts h1 {
    margin-bottom: 2rem;
}

#all-posts ul {
    list-style: none;
    padding: 0;
}

.year-group {
    margin-bottom: 2.5rem;
}

.year-header {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.year-count {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: normal;
}

.month-group {
    margin-bottom: 1.5rem;
}

.month-header {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

.month-posts {
    list-style: none;
    padding: 0;
}

.month-posts li {
    margin-bottom: 1.5rem;
}

.month-posts .post-link h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    transition: color 0.2s;
}

.month-posts .post-link:hover h3 {
    color: var(--accent);
}

.month-posts .post-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.month-posts .post-meta .read-time {
    margin-left: 0.5rem;
}

.month-posts p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 1.5rem;
    border-top: 1px dotted var(--border);
}

.tag {
    display: inline-block;
    font-size: 1.2em;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
    font-family: 'Fira Code', monospace;
}

.tag:hover {
    color: var(--accent);
    text-decoration: underline dashed;
    text-underline-offset: 8px;
}

.share-section {
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.share-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.share-buttons {
    display: flex;
    gap: 8px;
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: background-color 0.2s, color 0.2s;
}

.share-btn:hover {
    background: var(--accent);
    color: white;
}

.post-nav-links {
    display: flex;
    gap: 8px;
}

.post-nav-link {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    transition: color 0.2s;
    text-decoration: none;
}

.post-nav-link:hover .post-nav-title {
    color: var(--accent);
}

.post-nav-link svg {
    flex-shrink: 0;
    margin-top: 4px;
}

.post-nav-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: right;
}

.post-nav-link:hover .post-nav-label {
    color: var(--text-secondary);
}

.post-nav-title {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
    text-align: right;
}

.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: transform 0.2s, box-shadow 0.2s;
    z-index: 100;
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.tags-page {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 0rem;
}

.tags-page h1 {
    margin-bottom: 0.5rem;
}

.tag-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.tag-posts {
    list-style: none;
    padding: 0;
}

.tag-posts li {
    margin-bottom: 2rem;
}

.tag-posts .no-posts {
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.pagination-btn {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: 6px;
    color: var(--text-primary);
    transition: background-color 0.2s, color 0.2s;
}

.pagination-btn:hover {
    background: var(--accent);
    color: white;
}

.pagination-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.newsletter-section {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 0;
}

.newsletter-box {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem 1.5rem;
    margin: 1rem 0 2rem 0;
}

.newsletter-box p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 1rem 0;
}

.newsletter-form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.newsletter-form input[type="text"],
.newsletter-form input[type="email"] {
    flex: 1;
    min-width: 150px;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.newsletter-form input[type="text"]::placeholder,
.newsletter-form input[type="email"]::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.newsletter-form input[type="text"]:focus,
.newsletter-form input[type="email"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.newsletter-form input[type="submit"] {
    padding: 0.5rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    background: var(--accent);
    color: white;
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
}

.newsletter-form input[type="submit"]:hover {
    background: #1d4ed8;
}

.newsletter-form .newsletter-note {
    width: 100%;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.75rem;
    margin-bottom: 0;
}