/* Selfish Handbook Theme */
/* A project's site: its pages down a sidebar, like a manual, and its
   updates as a plain list. Calm sans text, generous code, notes as
   callouts. */

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

:root {
  --primary-color: #1f2328;
  --secondary-color: #57606a;
  --text-color: #1f2328;
  --text-secondary: #57606a;
  --background: #ffffff;
  --background-alt: #f6f8fa;
  --sidebar: #f6f8fa;
  --border-color: #d8dee4;
  --link-color: #0a63c9;
  --link-hover: #084f9f;
  --accent-color: #0a63c9;
  --accent-soft: #e7f0fb;
  --code-bg: #f3f4f6;
  --max-width: 760px;
  --sidebar-width: 272px;
  --spacing-xs: 0.4rem;
  --spacing-sm: 0.8rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
}

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-color);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link-color); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 2px; border-radius: 3px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  padding: 0.5rem 0.9rem;
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  z-index: 10;
}
.skip-link:focus { left: 0.5rem; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md); }

/* ============ SIDEBAR (the header, down the left on a wide screen) ============ */
.site-header {
  background: var(--sidebar);
  border-bottom: 1px solid var(--border-color);
}
.site-header .container { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.site-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.site-title a { color: var(--primary-color); }
.site-title a:hover { text-decoration: none; color: var(--link-color); }
.site-description {
  margin-top: var(--spacing-xs);
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-secondary);
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.4rem;
  margin-top: var(--spacing-sm);
}
.site-nav a {
  display: block;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-color);
  line-height: 1.4;
}
.site-nav a:hover { background: var(--border-color); color: var(--text-color); text-decoration: none; }
.site-nav a[aria-current] {
  background: var(--accent-soft);
  color: var(--link-hover);
  font-weight: 600;
}
/* A link to somewhere else says so. */
.site-nav a[href^="http"]::after { content: " ↗"; color: var(--text-secondary); }

@media (min-width: 960px) {
  body {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    grid-template-rows: 1fr auto;
    min-height: 100vh;
  }
  .site-header {
    grid-column: 1;
    grid-row: 1 / span 2;
    border-bottom: none;
    border-right: 1px solid var(--border-color);
  }
  .site-header .container {
    position: sticky;
    top: 0;
    max-height: 100vh;
    overflow-y: auto;
    padding: var(--spacing-lg) var(--spacing-md);
  }
  .site-nav {
    flex-direction: column;
    flex-wrap: nowrap;
    margin: var(--spacing-md) calc(-1 * 0.6rem) 0;
  }
  .site-nav a { padding: 0.4rem 0.6rem; border-left: 2px solid transparent; border-radius: 0 6px 6px 0; }
  .site-nav a[aria-current] { border-left-color: var(--accent-color); }
  main.container, .site-footer { grid-column: 2; }
  main.container { width: 100%; margin: 0 auto; padding: var(--spacing-lg) var(--spacing-lg) 0; }
}

main.container { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }

/* ============ UPDATES (the posts listing) ============ */
.posts { display: flex; flex-direction: column; }
.post-preview {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
}
.post-preview:first-child { padding-top: 0; }
.post-preview h2 {
  font-size: 1.2rem;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 0.2rem;
}
.post-preview h2 a { color: var(--primary-color); }
.post-preview h2 a:hover { color: var(--link-color); }
.post-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}
.post-meta a { color: var(--text-secondary); }
.post-excerpt { margin-top: 0.4rem; color: var(--text-color); }
.read-more {
  display: inline-block;
  margin-top: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--link-color);
}
.empty-state {
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--text-secondary);
  border: 1px dashed var(--border-color);
  border-radius: 8px;
}
.home-intro { margin-bottom: var(--spacing-lg); padding-bottom: var(--spacing-md); border-bottom: 1px solid var(--border-color); }

/* ============ A PAGE OR POST ============ */
.post-header { margin-bottom: var(--spacing-md); }
.post-title {
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--primary-color);
}
.post-header .post-meta { margin-top: var(--spacing-xs); }

.post-content { font-size: 1rem; }
.post-content p { margin: 0 0 1.1em; }
.post-content h2 {
  font-size: 1.5rem;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin: 2em 0 0.7em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-color);
  color: var(--primary-color);
}
.post-content h3 {
  font-size: 1.2rem;
  font-weight: 650;
  line-height: 1.35;
  margin: 1.6em 0 0.5em;
  color: var(--primary-color);
}
.post-content a { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
.post-content ul, .post-content ol { margin: 0 0 1.1em; padding-left: 1.5em; }
.post-content li { margin: 0.25em 0; }
.post-content blockquote {
  margin: 1.4em 0;
  padding: 0.8em 1.1em;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent-color);
  border-radius: 0 6px 6px 0;
  color: var(--text-color);
}
.post-content blockquote p:last-child { margin-bottom: 0; }
.post-content :not(pre) > code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.12em 0.35em;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}
.post-content pre {
  margin: 1.3em 0;
  padding: 1em 1.2em;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.86em;
  line-height: 1.55;
}
.post-content pre code { font-family: var(--mono); }
.post-content hr { border: none; border-top: 1px solid var(--border-color); margin: 2.2em 0; }
.post-content img, .post-content video { max-width: 100%; height: auto; border-radius: 8px; }
.post-content figure { margin: 1.5em 0; }
.post-content figcaption { margin-top: 0.5em; font-size: 0.85rem; color: var(--text-secondary); text-align: center; }

.toc {
  background: var(--background-alt);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.9em 1.2em;
}

.post-taxonomy { margin-top: var(--spacing-lg); display: flex; flex-wrap: wrap; gap: 0.4rem; }
.category-pill, .tag-pill {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: var(--background);
}
.category-pill { color: var(--link-hover); background: var(--accent-soft); border-color: transparent; }
.category-pill:hover, .tag-pill:hover { text-decoration: none; border-color: var(--accent-color); color: var(--link-hover); }

.post-nav {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--spacing-sm);
}
.back-link { display: inline-block; padding: 0.3em 0; font-size: 0.92rem; font-weight: 500; }

.taxonomy-section { margin-top: var(--spacing-lg); }
.taxonomy-section h2 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-secondary); margin-bottom: var(--spacing-sm); }

/* ============ MEDIA, TAXONOMY AND ARCHIVES ============ */
figure { margin: 0; }
.media-image img, .media-video video { display: block; max-width: 100%; height: auto; }
.media-audio audio { display: block; width: 100%; }
.post-attachments { display: grid; gap: var(--spacing-sm); margin-top: var(--spacing-md); }
.post-categories, .post-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.archive-header { margin-bottom: var(--spacing-lg); }
.archive-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}
.archive-title { margin-top: 0.2rem; font-size: 1.9rem; font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; color: var(--primary-color); }
.archive-description { margin-top: 0.5rem; color: var(--text-secondary); }

/* ============ FOOTER ============ */
.site-footer {
  padding: var(--spacing-lg) 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.site-footer .container { border-top: 1px solid var(--border-color); padding-top: var(--spacing-md); }
.site-footer p + p { margin-top: 0.3rem; }
.powered-by a { color: var(--text-secondary); text-decoration: underline; }

/* ============ DARK MODE ============ */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #e6edf3;
    --secondary-color: #9198a1;
    --text-color: #e6edf3;
    --text-secondary: #9198a1;
    --background: #0d1117;
    --background-alt: #151b23;
    --sidebar: #151b23;
    --border-color: #30363d;
    --link-color: #58a6ff;
    --link-hover: #8cc4ff;
    --accent-color: #58a6ff;
    --accent-soft: #15253a;
    --code-bg: #161b22;
  }
  .site-nav a[aria-current] { color: #cfe4ff; }
  .category-pill { color: #cfe4ff; }
}

/* ============ SMALL SCREENS ============ */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .container { padding: 0 var(--spacing-sm); }
  .post-title { font-size: 1.7rem; }
  .post-content h2 { font-size: 1.3rem; }
}

/* ============ PRINT ============ */
@media print {
  body { display: block; font-size: 11pt; color: #000; background: #fff; }
  .site-header { border: none; background: none; }
  .site-nav, .skip-link, .post-nav { display: none; }
  .post-content a { color: #000; }
  .post-content pre { white-space: pre-wrap; }
}
/* inline media figures (shared across themes) */
.post-content figure { margin: 1.6em 0; }
.post-content figure img,
.post-content figure video { display: block; max-width: 100%; height: auto; }
.post-content figure audio { display: block; width: 100%; }

/* lists + code blocks (shared across themes) */
.post-content ul, .post-content ol { margin: 1em 0; padding-left: 1.6em; }
.post-content li { margin: 0.3em 0; }
.post-content li > ul, .post-content li > ol { margin: 0.3em 0; }
.post-content pre {
    margin: 1.2em 0;
    padding: 1em 1.2em;
    background: rgba(127, 127, 127, 0.12);
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.9em;
    line-height: 1.5;
}
.post-content pre code {
    font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
    white-space: pre;
    background: none;
    color: inherit;
    padding: 0;
}

/* Readers who ask for less motion get none: no hover lifts or tilts. */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* code highlighting (shared, E4): tints of the theme's own text colour,
   so they keep its contrast on light and dark themes alike */
.post-content pre .hl-k { color: color-mix(in srgb, currentColor 50%, #c2255c); }
.post-content pre .hl-t { color: color-mix(in srgb, currentColor 50%, #1971c2); }
.post-content pre .hl-s { color: color-mix(in srgb, currentColor 50%, #2b8a3e); }
.post-content pre .hl-n { color: color-mix(in srgb, currentColor 50%, #e8590c); }
.post-content pre .hl-a { color: color-mix(in srgb, currentColor 50%, #9c36b5); }
.post-content pre .hl-c { color: color-mix(in srgb, currentColor 62%, transparent); font-style: italic; }

/* inline code, dividers and footnotes (shared; :where() lets a theme's own rules win) */
:where(.post-content) code {
    font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;
    font-size: 0.9em;
    padding: 0.1em 0.3em;
    background: rgba(127, 127, 127, 0.14);
    border-radius: 4px;
}
:where(.post-content) hr {
    border: none;
    border-top: 1px solid rgba(127, 127, 127, 0.35);
    margin: 2em 0;
}
.footnote-ref { line-height: 0; }
.footnote-ref a { text-decoration: none; padding: 0 0.1em; }
.footnotes {
    margin-top: 2.5em;
    padding-top: 1em;
    border-top: 1px solid rgba(127, 127, 127, 0.35);
    font-size: 0.9em;
}
.footnotes ol { padding-left: 1.6em; }
.footnotes li { margin: 0.4em 0; }
.footnote-backref { text-decoration: none; }
.toc { margin: 1.5em 0; padding: 0.9em 1.2em; border-left: 3px solid rgba(127, 127, 127, 0.35); font-size: 0.95em; }
.toc ol { margin: 0; padding-left: 1.2em; }
.toc ol ol { margin: 0.2em 0 0.3em; }
.toc li { margin: 0.25em 0; }
/* chosen post thumbnails, list layout (shared across themes) */
.post-preview.has-thumb {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 8.5rem;
    column-gap: 1.5rem;
    align-items: start;
}
.post-preview.has-thumb > * { grid-column: 1; }
.post-preview.has-thumb > .post-preview-thumb {
    grid-column: 2;
    grid-row: 1 / span 4;
    display: block;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--background-alt);
    transition: border-color 0.2s ease;
}
.post-preview.has-thumb > .post-preview-thumb:hover {
    border-color: var(--accent-color, var(--link-color));
}
.post-preview-thumb img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}
.post-preview-thumb:hover img { transform: scale(1.04); }
@media (max-width: 600px) {
    .post-preview.has-thumb { grid-template-columns: minmax(0, 1fr); }
    .post-preview.has-thumb > .post-preview-thumb {
        grid-column: 1;
        grid-row: auto;
        aspect-ratio: 16 / 9;
        margin-bottom: 0.9rem;
    }
}
@media (prefers-reduced-motion: reduce) {
    .post-preview-thumb img,
    .post-preview.has-thumb > .post-preview-thumb { transition: none; }
    .post-preview-thumb:hover img { transform: none; }
}
/* pagination (shared across themes; links borrow each theme's .back-link) */
.pagination {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 0.75rem 1rem;
}
.pagination-newer { grid-column: 1; justify-self: start; }
.pagination-status {
    grid-column: 2;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: center;
}
.pagination-older { grid-column: 3; justify-self: end; }
.pagination + .post-nav { margin-top: 0; padding-top: 0; border-top: none; }
@media (max-width: 600px) {
    .pagination { grid-template-columns: 1fr 1fr; }
    .pagination-status { grid-column: 1 / -1; grid-row: 1; }
    .pagination-newer { grid-column: 1; grid-row: 2; }
    .pagination-older { grid-column: 2; grid-row: 2; }
}
/* skip link, focus, neighbours and print (shared across themes) */
.skip-link {
    position: absolute;
    left: 0.75rem;
    top: -4rem;
    z-index: 100;
    padding: 0.5rem 0.9rem;
    background: var(--background, #fff);
    color: var(--text-color, #111);
    border: 2px solid currentColor;
}
.skip-link:focus { top: 0.75rem; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }
.adjacent-posts {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.75rem 1.5rem;
}
.adjacent-newer { margin-left: auto; text-align: right; }
.adjacent-posts + .post-nav { margin-top: 0; padding-top: 0; border-top: none; }
@media print {
    .skip-link, .site-nav, .post-nav, .site-footer, .social-links { display: none !important; }
    body { background: #fff !important; color: #000 !important; }
    a { color: inherit !important; }
    img, video, figure { break-inside: avoid; max-width: 100% !important; }
}