@font-face {
  font-family: "Monaspace Neon";
  src: url("https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.101/fonts/webfonts/MonaspaceNeon-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Monaspace Neon";
  src: url("https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.101/fonts/webfonts/MonaspaceNeon-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Monaspace Neon";
  src: url("https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.101/fonts/webfonts/MonaspaceNeon-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("https://cdn.jsdelivr.net/npm/inter-ui@4.1.0/web/Inter-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("https://cdn.jsdelivr.net/npm/inter-ui@4.1.0/web/Inter-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("https://cdn.jsdelivr.net/npm/inter-ui@4.1.0/web/Inter-SemiBold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("https://cdn.jsdelivr.net/npm/inter-ui@4.1.0/web/Inter-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("https://cdn.jsdelivr.net/npm/inter-ui@4.1.0/web/Inter-Italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

/* === Design tokens === */
:root {
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Monaspace Neon", "JetBrains Mono", "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

  --color-bg: #fcfcfc;
  --color-text: #1f1f1f;
  --color-heading: #0a0a0a;
  --color-muted: #6b6b6b;
  --color-border: #e6e6e6;
  --color-accent: #2563a8;
  --color-accent-hover: #1d4d82;
  --color-bg-code: #f4f4f4;
  --color-bg-code-border: #e6e6e6;
  --color-bg-hover: #f3f3f3;

  --measure: 44rem;
}

/* === Reset / base === */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

.site-body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background-color: var(--color-heading);
  color: var(--color-bg);
  text-decoration: none;
  border-radius: 0 0 0.25rem 0;
}

.skip-link:focus {
  left: 0;
}

/* === Layout === */
.site-container {
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 1.5rem;
  padding-block-end: 2rem;
}

.site-header {
  max-width: var(--measure);
  margin-inline: auto;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-heading);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-title:hover {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  font-size: 1rem;
}

.nav-link {
  color: var(--color-heading);
  text-decoration: none;
  padding-block: 0.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color 0.15s ease;
}

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

.site-footer {
  max-width: var(--measure);
  margin: 3rem auto 0;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

.footer-nav {
  display: flex;
  gap: 1rem;
}

.site-footer a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-footer a:hover {
  color: var(--color-heading);
}

/* === Article meta === */
.article-header {
  margin-block-end: 2rem;
}

.article-header h1 {
  margin-block-end: 0.5rem;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.article-reading-time::before {
  content: "\00b7";
  margin-inline-end: 0.5rem;
}

.back-link {
  display: inline-block;
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.875rem;
  margin-block-end: 1.5rem;
  transition: color 0.15s ease;
}

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

/* === Prose typography === */
.main-content {
  line-height: 1.75;
  margin-block-start: 1rem;
}

.prose a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition:
    color 0.15s ease,
    text-decoration-color 0.15s ease;
}

.prose a:hover {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

.main-content h1 {
  font-size: clamp(1.6rem, 1.2rem + 2vw, 2.1rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1.5rem;
  color: var(--color-heading);
  letter-spacing: -0.03em;
}

.main-content h2 {
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.35;
  margin: 2.5rem 0 1rem;
  color: var(--color-heading);
  letter-spacing: -0.02em;
}

.main-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 2rem 0 0.75rem;
  color: var(--color-heading);
  letter-spacing: -0.01em;
}

.prose p {
  margin-block: 1.25rem;
}

.prose ul {
  list-style: disc;
  margin-block: 1.25rem;
  padding-inline-start: 1.25rem;
}

.prose ol {
  margin-block: 1.25rem;
  padding-inline-start: 1.25rem;
}

.prose li {
  margin-block: 0.375rem;
}

.prose blockquote {
  font-style: italic;
  color: var(--color-muted);
  border-inline-start: 3px solid var(--color-border);
  margin-block: 1.5rem;
  padding: 0.25rem 0 0.25rem 1.25rem;
}

/* === Social links (homepage) === */
.social-links {
  display: flex;
  gap: 1rem;
  margin-block-start: 3rem;
  padding-block-start: 2rem;
  border-top: 1px solid var(--color-border);
}

.social-link {
  color: var(--color-muted);
  padding: 0.25rem;
  transition: color 0.15s ease;
}

.social-link:hover {
  color: var(--color-heading);
}

/* === Blog timeline === */
.blog-timeline {
  list-style: none;
  margin-block: 2rem 0;
  padding: 0;
}

.blog-timeline li {
  margin: 0;
}

.blog-timeline-entry {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding: 0.75rem 0.5rem;
  text-decoration: none;
  color: inherit;
  border-radius: 0.375rem;
  transition: background-color 0.15s ease;
}

.blog-timeline-entry:hover {
  background-color: var(--color-bg-hover);
}

.blog-timeline-date {
  flex-shrink: 0;
  width: 6.5rem;
  text-align: right;
  color: var(--color-muted);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.blog-timeline-content {
  display: block;
  flex: 1;
  min-width: 0;
  line-height: 1.5;
}

.blog-timeline-title {
  color: var(--color-heading);
  font-weight: 500;
  transition: color 0.15s ease;
}

.blog-timeline-entry:hover .blog-timeline-title {
  color: var(--color-accent);
}

.blog-timeline-sep {
  color: var(--color-muted);
}

.blog-timeline-desc {
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* === Figures === */
.figure-block {
  margin-block: 2rem;
  text-align: center;
}

.figure-block img {
  margin-inline: auto;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
}

.figure-caption {
  margin-block-start: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-muted);
  font-style: italic;
}

/* === Code === */
.highlight {
  border-radius: 0.5rem;
  border: 1px solid var(--color-bg-code-border);
  margin-block: 1.75rem;
  overflow-x: auto;
  background-color: var(--color-bg-code);
}

.highlight pre {
  margin: 0;
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}

code:not(pre code) {
  background-color: var(--color-bg-code);
  color: var(--color-text);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-size: 0.85em;
  font-weight: 500;
  border: 1px solid var(--color-bg-code-border);
  font-family: var(--font-mono);
}

/* === 404 === */
.error-page {
  text-align: center;
  padding-block: 4rem;
}

.error-title {
  font-size: 4rem;
  margin-block-end: 1rem;
}

.error-button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--color-heading);
  color: var(--color-bg);
  text-decoration: none;
  border-radius: 0.25rem;
  font-weight: 500;
  margin-block-start: 1rem;
}

.error-button:hover {
  background-color: var(--color-muted);
}

/* === Responsive === */
@media (max-width: 640px) {
  .site-header {
    padding: 1rem;
  }

  .site-title {
    font-size: 1rem;
  }

  .site-nav {
    gap: 1rem;
    font-size: 0.9rem;
  }

  .site-container {
    padding-inline: 1rem;
  }

  .site-footer {
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .nav-link {
    padding-block: 0.5rem;
  }

  .main-content {
    line-height: 1.7;
  }

  .highlight {
    margin-inline: -1rem;
    border-radius: 0;
    border-inline: none;
  }

  .social-links {
    justify-content: center;
  }

  .blog-timeline-entry {
    flex-direction: column;
    gap: 0.125rem;
    padding: 0.625rem 0.5rem;
  }

  .blog-timeline-date {
    text-align: left;
    width: auto;
    font-size: 0.8125rem;
  }
}

/* === Reduced motion === */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}