:root {
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, sans-serif;
  line-height: 1.55;
  font-size: 16px;
  background: var(--c-bg);
  color: var(--c-fg);
}

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

a:hover { color: var(--c-link-hover); text-decoration: underline; }

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

/* Media constraints (images + videos) */
.media-frame {
  display: flex;
  justify-content: center;
  margin: 1.25rem 0;
}

/* picture is just a wrapper */
.media-frame > picture {
  display: block;
  max-width: min(100%, var(--media-maxw, 100%));
}

/* constrain the actual rendered elements */
.media-frame img,
.media-frame video {
  max-width: min(100%, var(--media-maxw, 100%));
  max-height: var(--media-maxh, none);
  width: auto;
  height: auto;
}

.figure {
  margin: 1.5rem 0;
}

.figure picture {
  display: block;
  max-width: min(100%, var(--media-maxw, 100%));
}

.figure img,
.figure video {
  display: block;
  max-width: min(100%, var(--media-maxw, 100%));
  max-height: var(--media-maxh, none);
  width: auto;
  height: auto;
}

.figure figcaption {
  margin: 0.5rem 0 0;
  color: var(--c-muted);
  font-size: 0.95rem;
}

.page {
  max-width: var(--layout-max-width, 72rem);
  margin: 0 auto;
  padding: 0 1rem;
}

header { padding: 0 0; }

header .page { padding: 0.75rem 1rem; }

header.header-inline .page {
  display: flex;
  align-items: center;
  gap: 1rem;
}

header.header-inline .nav-desktop { margin-left: auto; }

header.header-stacked .page {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.6rem;
}

header.header-stacked .brand {
  align-self: flex-start;
}

header.header-stacked .nav-desktop {
  width: 100%;
  background: var(--c-nav-bg);
  color: var(--c-nav-fg);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo {
  height: calc(
    (var(--header-title-size) * 1.2) +
    (var(--header-tagline-size) * 1.2)
  );
  width: auto;
  display: block;
}


.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.brand-title {
  color: var(--c-title-fg);
  font-size: var(--header-title-size);
  font-weight: 700;
  line-height: 1.2;
}

.brand-tagline {
  color: var(--c-muted);
  font-size: var(--header-tagline-size);
  line-height: 1.2;
}

main { padding: 0 0 2rem; }

h1 { line-height: 1.2; margin: 0 0 1rem; }
h2, h3 { line-height: 1.25; margin-top: 2rem; }

h1, h2, h3, h4, h5, h6 { color: var(--c-heading); }

.meta {
  font-size: 0.95rem;
  opacity: 0.85;
  margin: 0.25rem 0 1.25rem;
  color: var(--c-muted);
}

.page-meta {
  margin: 0.25rem 0 0.9rem;
}

.page-meta > * {
  margin: 0;
}

.page-meta > * + * {
  margin-top: 0.35rem;
}

.page-meta .tags {
  margin: 0;
}

.meta-sep {
  padding: 0 0.15rem;
}

.meta-authors {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.meta-authors .author {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-authors .author-links {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.meta-authors .author-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: var(--c-bg);
  color: var(--c-fg);
  text-decoration: none;
}

.meta-authors .author-link:hover,
.meta-authors .author-link:focus-visible {
  border-color: var(--c-fg);
  background: var(--c-bg);
  color: var(--c-fg);
  opacity: 0.75;
}

.meta-authors .author-icon {
  width: 0.9rem;
  height: 0.9rem;
  display: block;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

nav a[aria-current="page"] {
  text-decoration: underline;
  font-weight: 600;
}

.menu-overlay {
  background: var(--c-bg);
}

.menu-overlay a {
  color: var(--c-fg);
}

.menu-overlay a:hover {
  color: var(--c-link-hover);
}

.video { margin: 1.5rem 0; }
.video__el { width: 100%; display: block; }

.banner-image { width: 100%; height: auto; display: block; }

pre, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Inline code only (expanded) */
p code,
li code,
td code,
th code,
blockquote code,
h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
  background: var(--c-quote-bg);
  color: var(--c-accent);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

pre .code-line::before {
  color: color-mix(in srgb, var(--c-code-fg) 45%, var(--c-code-bg));
}

pre code {
  color: var(--c-code-fg);
  background: none;
  padding: 0;
}

pre {
  overflow: auto;
  padding: 0.75rem;
  border-radius: 0.5rem;
  background: var(--c-code-bg);
  color: var(--c-code-fg);
  border: 1px solid var(--c-border);
  font-size: 0.9rem;
}

.codeblock__copy {
  display: none;
}

.js .codeblock {
  position: relative;
  margin: 1.25rem 0;
}

.js .codeblock pre {
  margin: 0;
  padding-top: 2.25rem;
}

.js .codeblock__copy {
  display: inline-flex;
  align-items: center;
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  border: 1px solid var(--c-border);
  background: var(--c-bg);
  color: var(--c-fg);
  border-radius: 0.5rem;
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  line-height: 1.2;
  cursor: pointer;
  opacity: 0;
  transition: opacity 120ms ease;
}

.js .codeblock__copy:active {
  transform: translateY(1px);
}

.js .codeblock:hover .codeblock__copy,
.js .codeblock__copy:focus-visible {
  opacity: 1;
}

.kbd,
.key {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border-radius: 0.25rem;
  border: 1px solid var(--c-border);
  border-bottom-width: 2px;
  background: var(--c-surface);
  color: var(--c-fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9em;
  line-height: 1.2;
}

hr {
  border: 0;
  border-top: 1px solid var(--c-border);
  margin: 2rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--c-border);
}

thead th {
  border-bottom: 2px solid var(--c-border);
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1rem;
  background: var(--c-quote-bg);
  border-left: 4px solid var(--c-quote-border);
}

/* Quote macro */
.quote {
  margin: 1.5rem 0;
}

.quote-body {
  margin: 0;
  padding: 0.75rem 1rem;
  background: var(--c-quote-bg);
  border-left: 4px solid var(--c-quote-border);
  font-style: italic;
}

.quote-body p {
  margin: 0;
}

.quote-caption {
  margin: 0.5rem 0 0;
  color: var(--c-muted);
  font-size: 0.95rem;
}

/* Callouts */
.callout {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-radius: 0.6rem;
  border: 1px solid var(--c-border);
  background: var(--c-surface);
}

.callout-title {
  font-weight: 600;
  margin: 0 0 0.35rem;
  color: var(--c-heading);
}

.callout-body > :first-child { margin-top: 0; }
.callout-body > :last-child { margin-bottom: 0; }

.callout-note { border-left: 4px solid #2f6fdb; }
.callout-tip { border-left: 4px solid #1b8f5a; }
.callout-info { border-left: 4px solid #3b7fb5; }
.callout-warning { border-left: 4px solid #b7791f; }
.callout-danger { border-left: 4px solid #c53030; }

/* Blog listing */
.post-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.post-list .list-item {
  padding: 1rem 1rem 0.9rem;
  border: 1px solid var(--c-border);
  border-radius: 0.75rem;
  background: var(--c-bg);
}

.post-list .item-title {
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 0.35rem;
  color: var(--c-heading);
}

.post-list .meta {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  color: var(--c-muted);
  opacity: 1; /* override the baseline opacity rule */
}

.post-list .abstract {
  margin: 0.6rem 0 0.85rem;
  max-width: 70ch;
}

/* Blog index layout */
.blog-index-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: start;
}

/* Desktop+ layout: main + right tags */
@media (min-width: 768px) {
  .blog-index-layout {
    grid-template-columns: 1fr clamp(14rem, 30vw, 20rem);
    gap: 1.5rem;
  }
}

/* Wide screens: keep sidebar from eating space */
@media (min-width: 1400px) {
  .blog-index-layout {
    grid-template-columns: 1fr 20rem; /* cap sidebar */
  }
}

/* Tags panel framing */
.blog-index-tags .tag-panel {
  border: 1px solid var(--c-border, #ddd);
  border-radius: 10px;
  background: var(--c-bg-soft, #f8f8f8);
  padding: 0.5rem 0.75rem;
}

/* Desktop+: keep visible while scrolling */
@media (min-width: 768px) {
  .blog-index-tags .tag-panel {
    position: sticky;
    top: 1rem;
  }
}

/* Toggle row (mobile-friendly) */
.tag-panel-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-weight: 700;
  padding: 0.25rem 0;
  list-style: none;
}

.tag-panel-icon {
  width: 0.95rem;
  height: 0.95rem;
  display: inline-block;
  flex: 0 0 auto;
  background-color: var(--c-muted);
  -webkit-mask: url("../tag.svg") no-repeat center / contain;
  mask: url("../tag.svg") no-repeat center / contain;
  opacity: 0.9;
}

/* Remove default disclosure marker */
.tag-panel-toggle::-webkit-details-marker { display: none; }

/* Body spacing */
.tag-panel-body {
  margin-top: 0.5rem;
}

/* Mobile: collapsed by default; when opened, don't become huge */
@media (max-width: 767.98px) {
  .blog-index-tags .tag-panel[open] .tag-panel-body {
    max-height: 50vh;
    overflow: auto;
  }
}

/* Tags as pills */
.tags {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.tags::before {
  content: "";
  width: 0.95rem;
  height: 0.95rem;
  display: inline-block;
  flex: 0 0 auto;
  background-color: var(--c-muted);
  -webkit-mask: url("../tag.svg") no-repeat center / contain;
  mask: url("../tag.svg") no-repeat center / contain;
  opacity: 0.9;
}

.tags li {
  margin: 0;
}

.tags a,
.tags .tag {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: var(--c-muted);
  color: var(--c-bg);
  font-size: 0.85rem;
  line-height: 1.3;
  text-decoration: none;
  opacity: 0.85;
}

.tags a:hover,
.tags a:focus-visible,
.tags .tag:hover,
.tags .tag:focus-visible {
  background: var(--c-fg);
  border-color: var(--c-fg);
  color: var(--c-bg);
}

.tags-inline .tag {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--c-fg);
  font-size: 0.95rem;
  opacity: 1;
}

.tags-inline .tag:hover,
.tags-inline .tag:focus-visible {
  text-decoration: underline;
  background: transparent;
  border-color: transparent;
  color: var(--c-fg);
}

.tags-pills .tag {
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: var(--c-muted);
  color: var(--c-bg);
  font-size: 0.85rem;
  line-height: 1.3;
  text-decoration: none;
  opacity: 0.85;
}

/* -------------------------------------------------------------------
   Blog Items Macro — blogitems
   ------------------------------------------------------------------- */

.blogitems {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0 0 0 1.5rem;
  display: grid;
  gap: 1.25rem;
}

.blogitem {
  padding-left: 0;
}

.blogitem > a {
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--text, #000);
}

.blogitem > a:hover {
  text-decoration: underline;
}

.blogitem-excerpt {
  margin: 0.25rem 0 0;
  color: var(--text-muted, #666);
  font-size: 0.95rem;
  line-height: 1.4;
}

/* -------------------------------------------------------------------
   Series Macro — series
   ------------------------------------------------------------------- */

/* Series navigation: vertical list with an arrow marker for current page */
nav.series-nav {
  border: 1px solid var(--c-border, #ddd);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  background: var(--c-bg-soft, #f8f8f8);
}

nav.series-nav .series-title {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

nav.series-nav .series-title a {
  text-decoration: none;
}

/* Parts list must be vertical (override any global nav flex rules) */
nav.series-nav ul.series-parts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

/* Two-column row: [marker][text] */
nav.series-nav li.series-part {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

/* Arrow gutter */
nav.series-nav li.series-part::before {
  content: "";
  width: 1.6em;
  flex: 0 0 1.6em;
  text-align: right;
}

/* Current page marker + emphasis */
nav.series-nav li.series-part.is-current::before {
  content: "→";
}

nav.series-nav .series-current {
  font-weight: 700;
}

/* Optional: make links look consistent */
nav.series-nav li.series-part a {
  text-decoration: none;
}

nav.series-nav li.series-part a:hover {
  text-decoration: underline;
}

.list-item .series-parts .series-part-meta {
  display: block;
  font-size: 0.85rem;
}

/* -------------------------------------------------------------------
   Related Macro — related
   ------------------------------------------------------------------- */

.related {
  margin: 2rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--c-border);
}

.related h2 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
}

.related ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.related li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: baseline;
}

.related a {
  text-decoration: none;
  color: var(--c-fg);
  font-weight: 600;
}

.related a:hover,
.related a:focus-visible {
  text-decoration: underline;
}

.related .meta {
  color: var(--c-muted);
  font-size: 0.9rem;
}

.pager a,
.pager span {
  color: var(--c-muted);
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
}

.pager-group {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.pager-right {
  justify-content: flex-end;
}

.pager-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--c-muted);
  text-decoration: none;
  font-weight: 600;
}

.pager-link:hover,
.pager-link:focus-visible {
  text-decoration: underline;
}

.pager-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
}

footer {
  margin-top: 3rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--c-border);
  background: transparent;
}

footer .page {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--c-muted);
}

footer .footer-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

footer .footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--c-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

footer .footer-link:hover,
footer .footer-link:focus-visible {
  text-decoration: underline;
}

footer .footer-link img {
  width: 18px;
  height: 18px;
  display: inline-block;
}

/* Optional: visually de-emphasize the stbl line further */
footer p:last-child {
  font-size: 0.85rem;
  opacity: 0.85;
}