:root {
    --max-width: 720px;

    /* Light mode colors */
    --text-color: #333;
    --bg-color: #fff;
    --link-color: #0066cc;
    --code-bg: #f4f4f4;
    --border-color: #ddd;
    --footer-text: #666;

    /* Alert colors - light mode */
    --note-bg: #f2f3f6;
    --note-border: #3b82f6;
    --tip-bg: #f0fdf4;
    --tip-border: #22c55e;
    --important-bg: #f3f0ff;
    --important-border: #a855f7;
    --warning-bg: #fefce8;
    --warning-border: #facc15;
    --caution-bg: #fef2f2;
    --caution-border: #ef4444;

    /* Syntax highlighting background */
    --highlight-bg: #282c34;
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Dark mode colors */
        --text-color: #e5e5e5;
        --bg-color: #1a1a1a;
        --link-color: #66b3ff;
        --code-bg: #2d2d2d;
        --border-color: #404040;
        --footer-text: #999;

        /* Alert colors - dark mode */
        --note-bg: #1e293b;
        --note-border: #3b82f6;
        --tip-bg: #14532d;
        --tip-border: #22c55e;
        --important-bg: #2e1065;
        --important-border: #a855f7;
        --warning-bg: #422006;
        --warning-border: #facc15;
        --caution-bg: #450a0a;
        --caution-border: #ef4444;

        /* Syntax highlighting background */
        --highlight-bg: #1e1e1e;
    }
}

/* Manual theme overrides */
.theme-light,
:root:has(#light:target) {
    /* Force light mode colors */
    --text-color: #333;
    --bg-color: #fff;
    --link-color: #0066cc;
    --code-bg: #f4f4f4;
    --border-color: #ddd;
    --footer-text: #666;

    /* Alert colors - light mode */
    --note-bg: #f2f3f6;
    --note-border: #3b82f6;
    --tip-bg: #f0fdf4;
    --tip-border: #22c55e;
    --important-bg: #f3f0ff;
    --important-border: #a855f7;
    --warning-bg: #fefce8;
    --warning-border: #facc15;
    --caution-bg: #fef2f2;
    --caution-border: #ef4444;

    /* Syntax highlighting background */
    --highlight-bg: #282c34;
}

.theme-dark,
:root:has(#dark:target) {
    /* Force dark mode colors */
    --text-color: #e5e5e5;
    --bg-color: #1a1a1a;
    --link-color: #66b3ff;
    --code-bg: #2d2d2d;
    --border-color: #404040;
    --footer-text: #999;

    /* Alert colors - dark mode */
    --note-bg: #1e293b;
    --note-border: #3b82f6;
    --tip-bg: #14532d;
    --tip-border: #22c55e;
    --important-bg: #2e1065;
    --important-border: #a855f7;
    --warning-bg: #422006;
    --warning-border: #facc15;
    --caution-bg: #450a0a;
    --caution-border: #ef4444;

    /* Syntax highlighting background */
    --highlight-bg: #1e1e1e;
}

* {
    box-sizing: border-box;
}

html {
    overflow-y: scroll;
}

/* Hide theme anchors */
#light, #dark {
    display: none;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: -100px;
    background: var(--bg-color);
    color: var(--link-color);
    padding: 8px;
    text-decoration: none;
    border: 2px solid var(--link-color);
    border-radius: 4px;
    z-index: 100;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

.skip-link:focus {
    top: 10px;
    left: 10px;
    clip: auto;
    overflow: visible;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

header, main, footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

header {
    padding-top: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-left a {
    text-decoration: none;
    color: var(--text-color);
}

.nav-left a:hover {
    color: var(--link-color);
}

.nav-left .site-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.rss-link {
    display: flex;
    align-items: center;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    transition: all 0.2s ease;
}

.rss-link:hover {
    background-color: var(--code-bg);
    border-color: var(--text-color);
    text-decoration: none;
}

.rss-link:focus {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    color: var(--text-color);
    transition: all 0.2s ease;
}

#theme-toggle:hover {
    background-color: var(--code-bg);
    border-color: var(--text-color);
}

#theme-toggle:focus {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

/* Hide JS button when no JS */
#theme-toggle {
    display: none;
}

/* Show JS button when JS is enabled */
.js #theme-toggle {
    display: block;
}

noscript {
    display: contents;
}

.theme-switcher {
    display: flex;
    gap: 0.25rem;
}

.theme-switcher a {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-size: 1rem;
    line-height: 1;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

.theme-switcher a:hover {
    background-color: var(--code-bg);
    border-color: var(--text-color);
}

.theme-switcher a:focus {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

/* Hide no-JS switcher when JS is enabled */
.js .theme-switcher {
    display: none;
}

main {
    padding: 2rem 20px;
    min-height: calc(100vh - 200px);
}

footer {
    padding: 2rem 20px;
    border-top: 1px solid var(--border-color);
    color: var(--footer-text);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-content p {
    margin: 0;
}

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

.social-links a {
    color: var(--footer-text);
    transition: color 0.2s ease;
}

.social-links a:hover {
    color: var(--link-color);
    text-decoration: none;
}

.social-links svg {
    display: block;
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

article header {
    border-bottom: none;
    padding: 0;
    margin-bottom: 2rem;
}

article header h1 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

/* Ensure consistent spacing for all h1 elements that are first in main */
main > h1:first-child,
main > article:first-child > header:first-child > h1:first-child {
    margin-top: 0;
}

article header .post-meta {
    color: var(--footer-text);
    font-size: 0.9rem;
}

article header .reading-time {
    color: var(--footer-text);
}

article header .post-meta.modified {
    margin-top: 0.25rem;
    font-size: 0.85rem;
    font-style: italic;
}

/* Draft badge */
.draft-badge {
    display: inline-block;
    padding: 0 0.3rem;
    margin-left: 0.5rem;
    background-color: var(--note-bg);
    color: var(--note-border);
    border: 1px solid var(--note-border);
    border-radius: 3px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    line-height: 1;
    vertical-align: 0.1rem;
}

article header .draft-badge {
    padding: 0;
    margin: 0;
    background: none;
    border: none;
    color: var(--note-border);
    font-size: 0.9rem;
    text-transform: lowercase;
    font-weight: normal;
    vertical-align: baseline;
}

/* Hide print-only elements on screen */
.print-only {
    display: none;
}

/* Post summary (in lists) */
.post-summary {
    margin-bottom: 2rem;
}

/* Post meta box (summary and/or note on post page) */
.post-meta-box {
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--code-bg);
    border-radius: 4px;
}

.post-meta-box .summary-text {
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.post-meta-box .summary-text:last-child {
    margin-bottom: 0;
}

.post-meta-box .note-text {
    font-style: italic;
    font-size: 0.85rem;
    color: var(--footer-text);
}

.post-meta-box .note-text p {
    margin: 0;
}

.post-meta-box .note-text p + p {
    margin-top: 0.5rem;
}

/* Table of contents */
.toc {
    margin-bottom: 2rem;
    padding: 1.5rem 0;
    position: relative;
}

/* Top horizontal line */
.toc::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--border-color);
}

/* Bottom horizontal line */
.toc::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--border-color);
}

.toc ul {
    list-style: none;
    padding-left: 2rem;
}

.toc > details > ul {
    padding-left: 0;
}

.toc li {
    margin-bottom: 0.25rem;
}

.toc a {
    text-decoration: none;
}

.toc a:hover {
    text-decoration: underline;
}

.content {
    margin-top: 2rem;
}

.content p {
    margin-bottom: 1rem;
}

.content ul, .content ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.content ul ul, .content ul ol,
.content ol ul, .content ol ol {
    margin-bottom: 0.5rem;
    margin-top: 0.5rem;
}

.content li {
    margin-bottom: 0.25rem;
}

/* Tables */
.content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
    overflow-x: auto;
    display: block;
}

.content table th,
.content table td {
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    text-align: left;
}

.content table th {
    background-color: var(--code-bg);
    font-weight: 600;
}

.content table tr:nth-child(even) {
    background-color: var(--code-bg);
}

/* Definition lists */
.content dl {
    margin: 1rem 0;
}

.content dt {
    font-weight: 600;
    margin-top: 1rem;
}

.content dd {
    margin-left: 2rem;
    margin-bottom: 0.5rem;
}

.content blockquote {
    margin: 1rem 0;
    padding-left: 1rem;
    border-left: 3px solid var(--border-color);
    color: var(--footer-text);
}

/* GitHub-style alerts */
.content blockquote.note,
.content blockquote.tip,
.content blockquote.important,
.content blockquote.warning,
.content blockquote.caution {
    padding: 0.75rem 1rem;
    border-left-width: 4px;
    border-radius: 4px;
    margin: 1rem 0;
}

.content blockquote.note > :first-child,
.content blockquote.tip > :first-child,
.content blockquote.important > :first-child,
.content blockquote.warning > :first-child,
.content blockquote.caution > :first-child {
    margin-top: 0;
}

.content blockquote.note > :last-child,
.content blockquote.tip > :last-child,
.content blockquote.important > :last-child,
.content blockquote.warning > :last-child,
.content blockquote.caution > :last-child {
    margin-bottom: 0;
}

.content blockquote.note {
    background-color: var(--note-bg);
    border-left-color: var(--note-border);
    color: var(--text-color);
}

.content blockquote.tip {
    background-color: var(--tip-bg);
    border-left-color: var(--tip-border);
    color: var(--text-color);
}

.content blockquote.important {
    background-color: var(--important-bg);
    border-left-color: var(--important-border);
    color: var(--text-color);
}

.content blockquote.warning {
    background-color: var(--warning-bg);
    border-left-color: var(--warning-border);
    color: var(--text-color);
}

.content blockquote.caution {
    background-color: var(--caution-bg);
    border-left-color: var(--caution-border);
    color: var(--text-color);
}

code {
    font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
    font-size: 0.9em;
    background-color: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
}

pre {
    margin: 1rem 0;
    padding: 1rem;
    background-color: var(--code-bg);
    border-radius: 4px;
    overflow-x: auto;
}

pre code {
    padding: 0;
    background-color: transparent;
    font-size: 0.875rem;
}

.highlight {
    margin: 1rem 0;
}

.highlight pre {
    margin: 0;
    padding: 1rem;
}

/* Code copy button */
.code-wrapper {
    position: relative;
    margin: 1rem 0;
}

.code-wrapper pre {
    margin: 0;
}

.copy-button {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
}

.code-wrapper:hover .copy-button {
    opacity: 1;
}

.copy-button:hover {
    background: var(--code-bg);
}

.copy-button:focus {
    opacity: 1;
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

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

ul.posts li {
    margin-bottom: 0.75rem;
}

ul.posts .post-entry {
    display: flex;
    align-items: baseline;
}

ul.posts .date {
    color: var(--footer-text);
    font-family: monospace;
    font-size: 0.9rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

ul.posts .post-info {
    flex: 1;
}


ul.posts .post-summary {
    margin-top: 0.25rem;
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

.view-all {
    margin-top: 2rem;
    text-align: center;
}

/* 404 page */
.error-404 header h1 {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.error-404 .subtitle {
    font-size: 1.5rem;
    color: var(--footer-text);
    margin-bottom: 2rem;
}

.error-404 .error-code {
    margin-top: 3rem;
    font-family: monospace;
    font-size: 0.9rem;
    color: var(--footer-text);
}


/* Related posts */
.related-posts {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.related-posts h3 {
    margin-top: 0;
    margin-bottom: 1rem;
}

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

.related-posts li {
    margin-bottom: 0.5rem;
}

.related-posts .date {
    color: var(--footer-text);
    font-family: monospace;
    font-size: 0.9rem;
    margin-right: 1rem;
}

/* Post navigation */
.post-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.post-nav a {
    max-width: 45%;
}

.post-nav .prev {
    text-align: left;
}

.post-nav .next {
    text-align: right;
    margin-left: auto;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

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

@media (max-width: 600px) {
    body {
        font-size: 14px;
    }

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.1rem; }

    .nav-left {
        gap: 1rem;
    }

    .nav-left a:not(.site-title) {
        font-size: 0.9rem;
    }

    ul.posts .post-entry {
        flex-direction: column;
    }

    ul.posts .date {
        margin-bottom: 0.25rem;
    }
}

/* Print styles */
@media print {
    body {
        color: #000;
        background: #fff;
        font-size: 12pt;
        line-height: 1.5;
    }

    header nav, footer {
        display: none;
    }

    /* Show article header info for print */
    article header {
        display: block;
        margin-bottom: 1em;
        padding-bottom: 1em;
        border-bottom: 1px solid #000;
    }

    article header h1 {
        margin-bottom: 0.5em;
    }

    /* Show print-only elements */
    .print-only {
        display: block;
        margin-top: 0.5em;
    }

    .print-only .permalink {
        font-size: 0.8em;
        color: #666;
    }

    .skip-link,
    #theme-toggle,
    .theme-switcher,
    .post-nav {
        display: none !important;
    }

    main {
        max-width: 100%;
        margin: 0;
        padding: 0;
    }

    a {
        color: #000;
        text-decoration: underline;
    }

    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }

    a[href^="#"]:after {
        content: "";
    }

    pre, code {
        border: 1px solid #ddd;
        background: #f5f5f5;
    }

    blockquote {
        border-left: 3px solid #000;
    }

    .content blockquote.note,
    .content blockquote.tip,
    .content blockquote.important,
    .content blockquote.warning,
    .content blockquote.caution {
        border: 1px solid #000;
        background: #fff;
        padding: 0.5rem;
    }

    /* Avoid page breaks inside elements */
    pre, blockquote, table, .highlight {
        page-break-inside: avoid;
    }

    /* Add page break before h2 if needed */
    h2 {
        page-break-after: avoid;
    }

    /* Keep headings with their content */
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }

    p {
        orphans: 3;
        widows: 3;
    }
}