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

:root {
  --ink: #1a1a1a;
  --ink-2: #474747;
  --ink-3: #767676;
  --paper: hsl(0deg 0% 98%);
  --paper-2: hsl(0deg 0% 95%);
  --paper-3: hsl(0deg 0% 90%);
  --accent: #c45c2a;
  --accent-2: hsl(0deg 0% 82%);
  --accent-3: hsl(0deg 0% 94%);
  --link: #2b5f8e;
  --link-hover: #c45c2a;
  --code-bg: hsl(0deg 0% 93%);
  --code-border: hsl(0deg 0% 85%);
  --rule: hsl(0deg 0% 88%);
  --serif: 'Newsreader', Georgia, serif;
  --mono: 'JetBrains Mono', 'Courier New', monospace;
  --sans: 'DM Sans', system-ui, sans-serif;
}

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  font-size: 18px;
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ── */
header {
  border-bottom: 1px solid var(--rule);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  background: hsla(0deg, 0%, 98%, 0.92);
  backdrop-filter: blur(8px);
  z-index: 100;
}
.header-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.site-name {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
}
.site-name span { color: var(--accent); }
nav { display: flex; gap: 1.5rem; }
nav a {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--ink-2);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color 0.15s;
}
nav a:hover { color: var(--accent); }

/* ── Post page layout ── */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 4rem;
  align-items: start;
}

article { padding: 3rem 0 5rem; min-width: 0; }

/* ── Post meta ── */
.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.post-meta .sep { color: var(--rule); }
.tag {
  background: var(--accent-3);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-family: var(--sans);
  border: 1px solid var(--accent-2);
}

h1.post-title {
  font-family: var(--serif);
  font-size: 2.4rem;
  line-height: 1.2;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 0.5rem;
  max-width: 22ch;
}
.post-subtitle {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 300;
  font-style: italic;
  color: var(--ink-2);
  margin-bottom: 2.5rem;
  line-height: 1.5;
}
.post-divider {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

/* ── Prose ── */
.prose p { margin-bottom: 1.4em; color: var(--ink); }
.prose h1 {
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 500;
  line-height: 1.3;
  margin: 2.5em 0 0.75em;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.prose h2 {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 500;
  line-height: 1.3;
  margin: 2.5em 0 0.75em;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.prose h3 {
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  margin: 2em 0 0.6em;
}
.prose h4 {
  font-family: var(--sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin: 1.75em 0 0.5em;
  line-height: 1.4;
}
.prose h5, .prose h6 {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-2);
  margin: 1.5em 0 0.4em;
}
.prose a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s;
}
.prose a:hover { color: var(--link-hover); }

/* ── Lists ── */
.prose ul {
  list-style: none;
  margin: 1em 0 1.4em;
  padding: 0;
}
.prose ul li {
  position: relative;
  padding-left: 1.4em;
  margin-bottom: 0.5em;
  color: var(--ink);
}
.prose ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--ink-3);
  font-weight: 300;
}
.prose ol {
  margin: 1em 0 1.4em;
  padding-left: 1.5em;
}
.prose ol li { margin-bottom: 0.5em; color: var(--ink); }

/* Nested list */
.prose ul ul {
  margin: 0.5em 0 0.2em;
  padding-left: 1.2em;
  border-left: 2px solid var(--accent-2);
  margin-left: 0.2em;
}
.prose ul ul li { color: var(--ink-2); font-size: 0.95em; }
.prose ul ul li::before { content: '+'; color: var(--accent); font-weight: 500; }

/* ── Blockquote ── */
.prose blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.5em 0;
  padding: 0.5em 1.25em;
  color: var(--ink-2);
  font-style: italic;
}

/* ── Tables ── */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-family: var(--sans);
  font-size: 0.9em;
}
.prose th {
  background: var(--paper-2);
  color: var(--ink);
  font-weight: 500;
  padding: 0.6em 1em;
  border: 1px solid var(--paper-3);
  text-align: left;
}
.prose td {
  padding: 0.6em 1em;
  border: 1px solid var(--paper-3);
  color: var(--ink-2);
}
.prose tr:nth-child(even) td { background: var(--paper-2); }

/* ── Inline code ── */
code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--ink);
}

/* ── Code blocks ── */
pre {
  background: #1e1c18;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5em 0 2em;
}
pre code {
  font-family: var(--mono);
  font-size: 0.83em;
  background: none;
  border: none;
  padding: 0;
  color: #d4c9b0;
  line-height: 1.7;
}

/* highlight.js token colors for dark pre */
pre .hljs                               { background: transparent; color: #d4c9b0; padding: 0; }
pre .hljs-keyword,
pre .hljs-selector-tag,
pre .hljs-built_in,
pre .hljs-name                          { color: #d4956a; }
pre .hljs-title,
pre .hljs-title.function_,
pre .hljs-section                       { color: #9ab4d4; }
pre .hljs-string,
pre .hljs-attr,
pre .hljs-addition                      { color: #8eb87a; }
pre .hljs-comment,
pre .hljs-quote                         { color: #6b6654; font-style: italic; }
pre .hljs-type,
pre .hljs-class,
pre .hljs-title.class_                  { color: #c4a882; }
pre .hljs-number,
pre .hljs-literal                       { color: #a8c47a; }
pre .hljs-variable,
pre .hljs-params,
pre .hljs-template-variable             { color: #d4c9b0; }
pre .hljs-meta                          { color: #9ab4d4; }
pre .hljs-operator                      { color: #d4956a; }
pre .hljs-punctuation                   { color: #8a8070; }
pre .hljs-deletion                      { color: #e06c75; }

/* ── Callout (blockquote-based) ── */
.callout {
  background: var(--paper-2);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.75em 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.95em;
  color: var(--ink-2);
}
.callout strong {
  font-family: var(--sans);
  font-size: 0.8em;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.3em;
  font-weight: 500;
}

/* ── Images ── */
.prose img {
  max-width: 100%;
  border-radius: 6px;
  margin: 1.5em 0;
}

/* ── Cover image ── */
.cover {
  width: 100%;
  height: 280px;
  background-size: cover;
  background-position: center;
  border-radius: 8px;
  margin-bottom: 2em;
}
.cover-holder { margin-bottom: 1em; }

/* ── Bottom tags section ── */
.other-tags {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.other-tags b { color: var(--ink-2); }
.topic-tag {
  display: inline-block;
  background: var(--accent-3);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--accent-2);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.topic-tag:hover { background: var(--accent); color: white; border-color: var(--accent); }

/* ── Sidebar ── */
aside {
  padding-top: 3rem;
  position: sticky;
  top: 72px;
  font-family: var(--sans);
  min-width: 0;
}
.toc-label, .related-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

/* TOC generated by Rust */
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-list li { padding: 0; }
.toc-list li::before { display: none; }
.toc-link {
  display: block;
  font-size: 13px;
  color: var(--ink-2);
  text-decoration: none;
  padding: 4px 0 4px 10px;
  border-left: 2px solid transparent;
  line-height: 1.4;
  transition: color 0.15s, border-color 0.15s;
}
.toc-link:hover, .toc-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
}
.toc-hash { display: none; }
.toc-level-2 { padding-left: 10px; }
.toc-level-3 { padding-left: 22px; font-size: 12px; }
.toc-level-4 { padding-left: 34px; font-size: 12px; }
.toc-level-5, .toc-level-6 { padding-left: 46px; font-size: 11px; }

.sidebar-rule { border: none; border-top: 1px solid var(--rule); margin: 1.5rem 0; }

/* Related posts */
.related-posts-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.related-posts-list li { padding: 0; }
.related-posts-list li::before { display: none; }
.related-post {
  display: block;
  font-size: 13px;
  color: var(--link);
  text-decoration: none;
  padding: 3px 0;
  line-height: 1.4;
  transition: color 0.15s;
}
.related-post:hover { color: var(--link-hover); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--rule);
  padding: 2rem;
  margin-top: 4rem;
  text-align: center;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-3);
}
footer a { color: var(--ink-3); text-decoration: none; transition: color 0.15s; }
footer a:hover { color: var(--accent); }
.social { margin-top: 0.5rem; display: flex; justify-content: center; gap: 1.25rem; }

/* ── Math ── */
.math {
  display: block;
  overflow-x: auto;
  padding: 1rem 1.5rem;
  background: var(--paper-2);
  border-radius: 6px;
  margin: 1.5em 0;
  border: 1px solid var(--paper-3);
}

/* ── Index page ── */
body.index-page main {
  grid-template-columns: 1fr;
  max-width: 960px;
}
.index-header {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.index-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--rule);
}
.index-header-text h1 {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.2rem;
}
.index-header-text p {
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--ink-3);
  line-height: 1.5;
}

/* 3-column post grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.home-list-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.home-list-item:hover {
  border-color: var(--ink-3);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

/* Date */
.home-date-indicator {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

/* Title */
.home-item-title {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.45;
  transition: color 0.15s;
}
.home-item-title:hover { color: var(--accent); }

/* Description */
.home-item-desc {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-3);
  line-height: 1.55;
  margin: 0;
  flex: 1;
}

/* Tag badges */
.home-item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 0.5rem;
}
.home-tag {
  display: inline-block;
  background: var(--accent-3);
  color: var(--accent);
  padding: 1px 8px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-family: var(--sans);
  border: 1px solid var(--accent-2);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.home-tag:hover { background: var(--accent); color: white; border-color: var(--accent); }
.guest-badge {
  background: var(--paper-3);
  color: var(--ink-3);
  border-color: var(--rule);
}

/* ── Responsive ── */
@media (max-width: 960px) {
  .posts-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
  main { grid-template-columns: 1fr; gap: 0; }
  aside { display: none; }
  h1.post-title { font-size: 1.9rem; max-width: 100%; }
  body { font-size: 17px; }
  main { padding: 0 1.25rem; }
  header { padding: 0 1.25rem; }
  .posts-grid { grid-template-columns: 1fr; }
}