:root {
  --bg: #fff;
  --fg: #111;
  --muted: #6b6b6b;
  --faint: #9a9a9a;
  --rule: #e6e5e1;
  --underline: #c4c4c4;
  --accent: #b5443a;
  --font: "Times New Roman", Times, serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 19px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* same column and header as the homepage */

.page {
  max-width: 630px;
  margin: 0 auto;
  padding: 32px 24px 96px;
}

.page > * { animation: waterfall-in 0.7s var(--ease) both; }
.page > :nth-child(2) { animation-delay: 70ms; }
.page > :nth-child(3) { animation-delay: 140ms; }
.page > :nth-child(4) { animation-delay: 210ms; }

@keyframes waterfall-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--underline);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: text-decoration-color 0.2s ease;
}

a:hover { text-decoration-color: var(--fg); }

/* reading progress */

.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--accent);
  transform-origin: 0 50%;
  transform: scaleX(0);
  z-index: 10;
}

/* masthead */

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-bottom: 56px;
}

.home {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 25px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  text-decoration: none;
}

.home img {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  object-fit: cover;
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}

.home:hover img {
  transform: scale(1.12) rotate(-4deg);
  box-shadow: 0 6px 18px rgb(0 0 0 / 0.15);
}

.masthead .back {
  color: var(--muted);
  font-size: 15px;
  text-decoration-color: transparent;
  transition: color 0.2s, transform 0.4s var(--ease);
}

.masthead .back:hover { color: var(--fg); transform: translateX(-3px); }

/* index */

.index h1 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 2px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--rule);
}

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

.posts li {
  position: relative;
  padding: 6px 80px 6px 0;
  font-size: 17px;
  line-height: 1.35;
  transition: opacity 0.42s, filter 0.42s;
}

.posts:has(li:hover) li:not(:hover) { opacity: 0.3; filter: blur(2.4px); }

.posts .desc { color: var(--muted); font-style: italic; font-size: 0.9em; }
.posts .when { position: absolute; top: 6px; right: 0; color: var(--muted); font-size: 0.88em; }

/* article */

.post-head h1 {
  font-size: 30px;
  line-height: 1.2;
  margin: 0 0 16px;
}

.title-link { text-decoration-color: transparent; }
.title-link:hover { text-decoration-color: var(--fg); }

.byline {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
  margin: 0 0 40px;
}

.hero { margin: 0 0 40px; }

.prose h2 {
  font-size: 24px;
  line-height: 1.25;
  margin: 52px 0 12px;
}

.prose h3 {
  font-size: 20px;
  line-height: 1.3;
  margin: 36px 0 8px;
}

.prose p { margin: 0 0 22px; }

.prose blockquote {
  margin: 0 0 40px;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--fg);
}

.prose blockquote p { margin: 0 0 10px; }

.prose blockquote cite {
  display: block;
  font-style: normal;
  font-size: 16px;
  color: var(--muted);
}

.prose ul,
.prose ol {
  margin: 0 0 22px;
  padding-left: 22px;
}

.prose li { margin-bottom: 8px; }

.prose code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.8em;
  padding: 1px 5px;
  background: #f4f3f0;
  border-radius: 4px;
}

.codeblock {
  position: relative;
  margin: 0 0 22px;
}

.prose pre {
  margin: 0 0 22px;
  padding: 42px 16px 14px;
  overflow-x: auto;
  background: #f7f6f3;
  border-radius: 6px;
  line-height: 1.5;
}

.codeblock pre { margin: 0; }

.codeblock .copy {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
  color: var(--muted);
  font: 12px ui-monospace, "SF Mono", Menlo, monospace;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity 0.2s, color 0.2s, border-color 0.2s, transform 0.2s var(--ease);
}

.codeblock .copy svg { width: 13px; height: 13px; }
.codeblock:hover .copy { opacity: 1; }
.codeblock .copy:hover { color: var(--fg); border-color: var(--underline); }
.codeblock .copy:active { transform: scale(0.95); }
.codeblock .copy.done { color: #2f9e44; border-color: #b7e4c0; }

.prose pre code {
  padding: 0;
  background: none;
  font-size: 14px;
}

.prose .pull {
  margin: 32px 0;
  font-size: 22px;
  font-style: italic;
  text-align: center;
}

figure { margin: 36px 0; }

figure a { display: block; text-decoration: none; }

figure img {
  display: block;
  width: 100%;
  height: auto;
}

figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 15px;
  text-align: center;
}

/* scroll reveal for figures */

.reveal { opacity: 0; transform: translateY(10px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

.post-foot {
  margin-top: 56px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 16px;
}

.post-foot p { margin: 0 0 6px; }

@media (prefers-reduced-motion: reduce) {
  .page > * { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .posts:has(li:hover) li:not(:hover) { filter: none; }
}

@media (max-width: 600px) {
  body { font-size: 17px; }
  .page { padding: 28px 16px 72px; }
  .masthead { margin-bottom: 40px; }
  .home { font-size: 23px; }
  .post-head h1 { font-size: 26px; }
  .prose h2 { font-size: 22px; margin-top: 44px; }
  .prose h3 { font-size: 19px; }
  .prose p { margin-bottom: 18px; }
  .posts li { padding-right: 0; }
  .posts .when { position: static; display: block; }
}