:root {
  --width-content: 760px;
  --border-radius: 0.75rem;
  --box-shadow: 0 1px 3px 0;
  --color-accent: #4f46e51a;
  --color-bg: #ffffff;
  --color-bg-secondary: #f1f5f9;
  --color-link: #4f46e5;
  --color-secondary: #7c3aed;
  --color-secondary-accent: #7c3aed0d;
  --color-shadow: rgba(15, 23, 42, 0.08);
  --color-table: #4f46e5;
  --color-text: #0f172a;
  --color-text-secondary: #64748b;
  --color-scrollbar: #cbd5e1;
  --color-border: #e2e8f0;
  --color-code-bg: #0f172a;
  --color-code-text: #e2e8f0;
  --font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

:root[data-color-mode=dark] {
  --color-accent: #818cf826;
  --color-bg: #0b1120;
  --color-bg-secondary: #161f32;
  --color-link: #818cf8;
  --color-secondary: #c4b5fd;
  --color-secondary-accent: #c4b5fd15;
  --color-shadow: rgba(0, 0, 0, 0.45);
  --color-table: #818cf8;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-scrollbar: #334155;
  --color-border: #1e293b;
  --color-code-bg: #0000004d;
  --color-code-text: #e2e8f0;
}

@media (prefers-color-scheme: dark) {
  :root[data-color-mode=user] {
    --color-accent: #818cf826;
    --color-bg: #0b1120;
    --color-bg-secondary: #161f32;
    --color-link: #818cf8;
    --color-secondary: #c4b5fd;
    --color-secondary-accent: #c4b5fd15;
    --color-shadow: rgba(0, 0, 0, 0.45);
    --color-table: #818cf8;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-scrollbar: #334155;
    --color-border: #1e293b;
    --color-code-bg: #0000004d;
    --color-code-text: #e2e8f0;
  }
}
* {
  scrollbar-width: auto;
}

html {
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  transition: background-color 0.15s ease, color 0.15s ease;
}

/* ---------- Header / navigation ---------- */
/* Fixed bar that hides on scroll-down and slides back in (staying pinned) on
   scroll-up - see the script at the bottom of html/header.html. --header-height
   starts at this fallback and is corrected to the real rendered height by that
   same script, so `body`'s offset and the table of contents' sticky offset
   below both stay in sync with it. */
:root {
  --header-height: 68px;
}

body {
  padding-top: var(--header-height);
}

html {
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
  transform: translateY(0);
  transition: transform 0.25s ease, background-color 0.15s ease;
}

header.header--hidden {
  transform: translateY(-100%);
}

nav {
  max-width: var(--width-content);
  margin: 0 auto;
  margin-bottom: 0;
  gap: 0.75rem;
}

nav a:first-child {
  display: inline-flex;
  align-items: center;
}

nav a img {
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  box-shadow: none;
  height: 44px !important;
  width: 44px;
  object-fit: cover;
}

nav ul {
  align-items: center;
  display: flex;
  gap: 0.25rem;
}

nav ul li {
  margin: 0;
}

nav ul li a {
  border-radius: 9999px;
  color: var(--color-text);
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  text-decoration: none;
}

nav ul li a:hover {
  background-color: var(--color-bg-secondary);
  filter: none;
}

nav ul li ul {
  border-radius: var(--border-radius);
  padding: 0.4rem;
}

nav ul li ul li a {
  border-radius: calc(var(--border-radius) - 0.25rem);
}

@media (max-width: 768px) {
  nav {
    margin-bottom: 2.5rem;
  }
  nav ul li {
    width: auto;
  }
}
/* ---------- Theme switch ---------- */
.theme-switch {
  align-items: center;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  display: inline-flex;
  gap: 0.15rem;
  margin-left: auto;
  padding: 0.2rem;
}

.theme-switch__btn {
  align-items: center;
  background: transparent;
  border: none;
  border-radius: 9999px;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: inline-flex;
  height: 2rem;
  justify-content: center;
  margin: 0;
  padding: 0;
  transition: background-color 0.15s ease, color 0.15s ease;
  width: 2rem;
}

.theme-switch__btn svg {
  height: 1.05rem;
  width: 1.05rem;
  pointer-events: none;
}

.theme-switch__btn:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
  filter: none;
}

.theme-switch__btn[aria-pressed=true] {
  background-color: var(--color-bg);
  box-shadow: var(--box-shadow) var(--color-shadow);
  color: var(--color-link);
}

/* ---------- Typography ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
  letter-spacing: -0.02em;
}

article h1:first-child,
main > h1:first-child {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

p {
  color: var(--color-text);
}

a {
  font-weight: 600;
  text-decoration: none;
}

article a,
main a,
p a,
li a {
  border-bottom: 1px solid var(--color-accent);
  text-decoration: none;
}

a:hover {
  filter: none;
  opacity: 0.8;
}

.publication-date {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ---------- Buttons ---------- */
a b,
a strong,
button,
input[type=submit] {
  border-radius: 9999px;
  border-width: 0;
  box-shadow: var(--box-shadow) var(--color-shadow);
  font-weight: 600;
  padding: 0.7rem 1.4rem;
}

a em,
a i {
  border-radius: 9999px;
  border-width: 1.5px;
  padding: 0.7rem 1.4rem;
}

/* ---------- Code ---------- */
code,
samp {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 0.4rem;
  font-family: var(--font-family-mono);
  font-size: 0.85em;
  padding: 0.1rem 0.45rem;
}

pre {
  background-color: var(--color-code-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow) var(--color-shadow);
}

pre code,
pre samp {
  background: transparent;
  border: none;
  color: var(--color-code-text);
  font-family: var(--font-family-mono);
  font-size: 0.9rem;
  padding: 1rem 1.25rem;
}

/* ---------- Quotes ---------- */
blockquote,
blockquote p {
  background-color: var(--color-secondary-accent);
  border-left: 3px solid var(--color-secondary);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  display: block;
  font-size: 1.05rem;
  font-style: italic;
  line-height: var(--line-height);
  margin: 1.5rem 0;
  max-width: 100%;
  padding: 1rem 1.5rem;
  text-align: var(--justify-normal);
}

blockquote p {
  border-left: none;
  border-radius: 0;
  margin: 0;
  padding: 0;
}

blockquote footer {
  color: var(--color-text-secondary);
  display: block;
  font-size: small;
  font-style: normal;
  line-height: var(--line-height);
  padding: 0.75rem 0 0;
}

/* ---------- Tables ---------- */
table {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  white-space: normal;
}

table thead {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  font-weight: 700;
}

table tr:nth-child(even) {
  background-color: var(--color-bg-secondary);
}

/* ---------- Post cards on the front page ---------- */
.publications h2 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-top: 3rem;
  margin-bottom: 1.5rem;
}

.card-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow) var(--color-shadow);
  padding: 0;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: var(--color-link);
  box-shadow: 0 8px 24px -8px var(--color-shadow);
  transform: translateY(-2px);
}

.card-link {
  border-bottom: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.5rem;
}

.card-link:hover {
  filter: none;
  opacity: 1;
}

.card-date {
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-title {
  color: var(--color-text);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin: 0.5rem 0 0.6rem;
}

.card-link:hover .card-title {
  color: var(--color-link);
}

.card-excerpt {
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  flex-grow: 1;
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0 0 1rem;
  overflow: hidden;
}

.card-more {
  color: var(--color-link);
  font-size: 0.85rem;
  font-weight: 700;
  margin-top: auto;
  transition: gap 0.15s ease;
}

.empty-state {
  background-color: var(--color-bg-secondary);
  border: 1px dashed var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-secondary);
  padding: 2rem;
  text-align: center;
}

/* ---------- Pagination ---------- */
.pagination {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
}

.pagination__link {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

a.pagination__link:hover {
  background-color: var(--color-bg);
  border-color: var(--color-link);
  color: var(--color-link);
  filter: none;
  opacity: 1;
}

.pagination__link--disabled {
  opacity: 0.4;
  pointer-events: none;
}

.pagination__status {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
}

@media (max-width: 480px) {
  .pagination__status {
    display: none;
  }
}
/* ---------- Table of contents ---------- */
/* Only present on articles with 2+ headings - see SkunkHtml.fs. Widen `main`
   so the sidebar has room without squeezing the reading column. */
main:has(.article-layout) {
  max-width: 1100px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  align-items: start;
  gap: 3rem;
}

.toc {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  border-left: 1px solid var(--color-border);
  padding-left: 1.25rem;
}

.toc__title {
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 0 0 0.75rem;
  text-transform: uppercase;
}

.toc__list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc__item a {
  border-bottom: none;
  color: var(--color-text-secondary);
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.15s ease;
}

.toc__item a:hover {
  color: var(--color-text);
}

.toc__item--h3 a {
  font-size: 0.8rem;
  padding-left: 0.9rem;
}

.toc__item--active a {
  color: var(--color-link);
  font-weight: 700;
}

@media (max-width: 960px) {
  main:has(.article-layout) {
    max-width: var(--width-content);
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .toc {
    display: none;
  }
}
/* ---------- Footer ---------- */
footer {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  text-align: center;
  padding: 0 1rem 2rem;
}

footer small a {
  border-bottom: 1px solid var(--color-accent);
  color: var(--color-text-secondary);
}

hr {
  margin: 2rem 0;
}

/* ---------- Scrollbars ---------- */
*::-webkit-scrollbar-thumb {
  border-radius: 10px;
}