:root {
  --max-file-width: 110ch;
  --max-blog-width: 80ch;
  --left-padding: 12px;
  --right-padding: 12px;
  --top-bar-height: 48px;
  --body-font: "JetBrains Mono", "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono-font: "JetBrains Mono", monospace;
  --color-bg: #f7f9fc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-surface-muted: #e2e8f0;
  --color-text: #1e293b;
  --color-text-muted: #475569;
  --color-border: rgba(148, 163, 184, 0.35);
  --color-border-strong: rgba(148, 163, 184, 0.55);
  --color-inline-code: #4338ca;
  --color-inline-code-bg: rgba(99, 102, 241, 0.08);
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-soft: rgba(37, 99, 235, 0.12);
  --color-divider: rgba(148, 163, 184, 0.45);
  --color-shadow-soft: 0 12px 22px rgba(15, 23, 42, 0.07);
  --color-shadow-card: 0 20px 32px rgba(15, 23, 42, 0.08);
  --color-highlight-line: rgba(37, 99, 235, 0.12);
  --color-scroll-track: rgba(148, 163, 184, 0.22);
  --codeblock-border: rgba(148, 163, 184, 0.35);
  --codeblock-border-strong: rgba(148, 163, 184, 0.55);
  --codeblock-summary-bg: var(--color-surface);
  --codeblock-summary-hover: rgba(148, 163, 184, 0.16);
  --codeblock-code-bg: var(--color-surface);
  --codeblock-line-bg: transparent;
  --codeblock-line-border: rgba(148, 163, 184, 0.35);
  --codeblock-line-text: rgba(100, 116, 139, 0.95);
  --codeblock-line-active: rgba(37, 99, 235, 0.16);
  --codeblock-toggle-color: var(--color-text-muted);
  --codeblock-title-color: var(--color-text);
  --codeblock-lang-color: var(--color-text-muted);
  --codeblock-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

html {
  scroll-behavior: smooth;
  background-color: var(--color-bg);
  color: var(--color-text);
}

body {
  font-family: var(--body-font);
  max-width: var(--max-file-width);
  margin: auto;
  /* margin-top: 2rem; */
  font-size: 1rem;
  padding-left: var(--left-padding);
  padding-right: var(--right-padding);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #050b1a;
  --color-surface: #0f172a;
  --color-surface-alt: #141f35;
  --color-surface-muted: #1a2942;
  --color-text: #e2e8f0;
  --color-text-muted: #b7c5e5;
  --color-border: rgba(148, 163, 184, 0.22);
  --color-border-strong: rgba(148, 163, 184, 0.38);
  --color-inline-code: #c7d2fe;
  --color-inline-code-bg: rgba(129, 140, 248, 0.18);
  --color-accent: #8bbcff;
  --color-accent-hover: #adc7ff;
  --color-accent-soft: rgba(139, 188, 255, 0.24);
  --color-divider: rgba(148, 163, 184, 0.35);
  --color-shadow-soft: 0 20px 32px rgba(3, 7, 18, 0.6);
  --color-shadow-card: 0 28px 48px rgba(3, 7, 18, 0.65);
  --color-highlight-line: rgba(139, 188, 255, 0.22);
  --color-scroll-track: rgba(30, 58, 138, 0.45);
  --codeblock-border: rgba(148, 163, 184, 0.25);
  --codeblock-border-strong: rgba(148, 163, 184, 0.45);
  --codeblock-summary-bg: rgba(15, 23, 42, 0.95);
  --codeblock-summary-hover: rgba(96, 165, 250, 0.2);
  --codeblock-code-bg: rgba(12, 19, 35, 0.96);
  --codeblock-line-bg: rgba(255, 255, 255, 0.04);
  --codeblock-line-border: rgba(59, 130, 246, 0.25);
  --codeblock-line-text: rgba(148, 163, 184, 0.85);
  --codeblock-line-active: rgba(96, 165, 250, 0.28);
  --codeblock-toggle-color: rgba(148, 163, 184, 0.75);
  --codeblock-title-color: var(--color-text);
  --codeblock-lang-color: rgba(147, 197, 253, 0.9);
  --codeblock-shadow: 0 20px 36px rgba(3, 7, 18, 0.6);
}

code,
pre {
  font-family: var(--mono-font);
}

#_content {
  /* Align content area with top bar width via container; don't constrain here */
  max-width: 100%;
}

body .code-snippet,
body .file,
.fullwidth {
  max-width: var(--max-file-width);
  width: min(
    calc(100vw - var(--left-padding) - var(--right-padding)),
    var(--max-file-width)
  );
}

.blogwidth {
  max-width: var(--max-blog-width);
  min-width: min(
    100vw - var(--left-padding) - var(--right-padding),
    var(--max-blog-width)
  );
}

body .code-snippet,
body .code-snippet * {
  max-width: var(--max-file-width);
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  max-width: var(--max-file-width);
  width: min(
    calc(100vw - var(--left-padding) - var(--right-padding)),
    var(--max-file-width)
  );
  margin: 2rem 0;
}

.center {
  text-align: center;
}

.inline-code {
  color: var(--color-inline-code);
  font-family: var(--mono-font);
}

.scroll-target {
  scroll-margin-top: var(--top-bar-height);
}

/* page layout */

.page-shell {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-files {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Unify spacing between homepage and aggregate directory lists:
   when Files is inside .page-files, rely on the container gap instead of per-item margin */
.page-files .file {
  margin-bottom: 0;
}

.page-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: flex-start;
  /* Constrain to same width as top bar inner */
  width: min(
    calc(100vw - var(--left-padding) - var(--right-padding)),
    var(--max-file-width)
  );
  max-width: var(--max-file-width);
  margin: 0 auto;
}

.page-main--toc {
  grid-template-columns: minmax(0, 1fr) 250px;
}

.page-article {
  /* Fill the grid column; overall container width matches top bar */
  max-width: 100%;
  width: 100%;
}

.toc {
  position: sticky;
  top: calc(var(--top-bar-height) + 1.5rem);
  align-self: start;
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--color-shadow-soft);
  max-height: calc(100vh - var(--top-bar-height) - 3rem);
  overflow: auto;
  font-size: 0.92rem;
  min-width: 0;
}

.toc-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.toc-title::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 99px;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-item a {
  color: var(--color-accent);
  text-decoration: none;
  transition:
    color 0.15s ease,
    transform 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.toc-item a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-soft);
  transform: scale(0.6);
  transition:
    transform 0.15s ease,
    background 0.15s ease;
}

.toc-item a:hover {
  color: var(--color-accent-hover);
}

.toc-item a:hover::before {
  transform: scale(1);
  background: var(--color-accent-hover);
}

.toc-l3 {
  padding-left: 1rem;
  font-size: 0.9em;
  opacity: 0.85;
}

.toc-l4 {
  padding-left: 1.75rem;
  font-size: 0.85em;
  opacity: 0.75;
}

@media screen and (max-width: 1024px) {
  .page-main--toc {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    max-height: none;
    margin-top: 0.5rem;
    border-radius: 14px;
    box-shadow: var(--color-shadow-soft);
  }
}

@media screen and (max-width: 640px) {
  .page-shell {
    gap: 1.25rem;
  }

  .toc {
    font-size: 0.95rem;
    background: var(--color-surface-alt);
  }

  .toc-item a::before {
    display: none;
  }
}

.sticky {
  position: sticky;
  top: var(--top-bar-height);
  z-index: 2;
}

/* top bar stuff */

.top-bar {
  position: sticky;
  top: 0;
  z-index: 3;
  background-color: var(--color-bg);
  height: var(--top-bar-height);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1rem;
  display: block; /* full width container */
  backdrop-filter: blur(12px);
}

.top-bar-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: min(
    calc(100vw - var(--left-padding) - var(--right-padding)),
    var(--max-file-width)
  );
  max-width: var(--max-file-width);
  margin: 0 auto;
  box-sizing: border-box;
  padding-left: 0;
  padding-right: 0;
}

.side-bar {
  display: flex;
  flex-direction: row;
}

#posts {
  overflow: hidden;
  overflow-wrap: break-word;
  width: 100%;
  text-align: right;
  padding-left: 1vw;
}

/* 80ch magic number is derived from --max-blog-width */
/* TODO: fix sidebar on mobile */
@media screen and (max-width: calc(80ch + 40ch)) {
  .side-bar {
    flex-direction: column;
  }

  #posts {
    max-width: min(
      calc(100vw - var(--left-padding) - var(--right-padding) * 2),
      var(--max-file-width)
    );
  }
}

.top-bar-group {
  display: flex;
  justify-content: space-between;
  gap: 1.25rem;
  align-items: center;
}

.top-bar-group h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
}

.top-bar-group h3 a {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.95rem;
  border: 1px solid transparent;
  background: none;
  color: inherit;
  border-radius: 6px;
  padding: 0.25rem 0;
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}

.theme-toggle:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-text);
  border-color: var(--color-border);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle-label {
  letter-spacing: 0.05em;
  font-weight: 500;
}

.theme-toggle .hash {
  display: inline-flex;
  align-items: center;
}

/* top bar stuff end */

/*
  table stuff
*/

table {
  border: 1px solid var(--color-border);
  border-collapse: collapse;
}

th {
  font-weight: bolder;
  color: var(--color-text);
}

th,
td {
  border: 1px solid var(--color-border);
  padding: 10px;
}

/* table stuff end */

/*
  blockquote (markdown > ...)
*/

blockquote {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 10px;
  box-shadow: var(--color-shadow-soft);
}

blockquote > :first-child {
  margin-top: 0;
}

blockquote > :last-child {
  margin-bottom: 0;
}

/* nested quotes get a lighter accent */
blockquote blockquote {
  background: var(--color-surface);
  border-left-color: var(--color-accent-hover);
}

/* inline code inside quotes keeps consistent style */
blockquote code {
  background: var(--color-inline-code-bg);
  color: var(--color-inline-code);
}

/* blockquote end */

/*
  media in MDX content
  Ensure images/videos never overflow content width or the top bar boundary.
*/
.page-article img,
.blogwidth img,
.fullwidth img,
.page-article video,
.blogwidth video,
.fullwidth video,
.page-article canvas,
.blogwidth canvas,
.fullwidth canvas,
.page-article svg,
.blogwidth svg,
.fullwidth svg {
  max-width: 100%;
  height: auto;
  box-sizing: border-box;
}

.page-article img,
.blogwidth img,
.fullwidth img {
  display: block;
  margin: 1rem auto;
  border-radius: 10px;
}

/*
  header stuff
*/

h1 a:link,
h2 a:link,
h3 a:link,
h4 a:link,
h5 a:link,
h6 a:link,
h1 a:visited,
h2 a:visited,
h3 a:visited,
h4 a:visited,
h5 a:visited,
h6 a:visited,
h1 a:hover,
h2 a:hover,
h3 a:hover,
h4 a:hover,
h5 a:hover,
h6 a:hover {
  color: var(--color-text);
  text-decoration: none;
}

h1 > a .hash,
h2 > a .hash,
h3 > a .hash,
h4 > a .hash,
h5 > a .hash,
h6 > a .hash {
  margin-right: 1rem;
}

/* header stuff end */

/*
  challenge information
*/

.challenge-info {
  margin-bottom: 5ch;
}

.challenge-info-item {
  display: inline;
}

.challenge-info-item-val {
  font-weight: bold;
}

/* challenge information end */

/*
  file stuff
*/

.file {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono-font);
  margin-bottom: 0.5rem;
}

.file-link {
  display: inline-flex;
  align-items: center;
}

.file-link img {
  padding-right: 1rem;
  height: 22px;
  width: auto;
  display: inline-block;
}

.file-meta {
  display: flex-inline;
  justify-content: space-evenly;
}

/* normally mobile is 480px */
@media screen and (max-width: 520px) {
  .file-meta {
    display: none;
  }
}

.file-meta-date {
  margin-left: 1rem;
}

/* file stuff end */

/*
  code block stuff
*/

.code-snippet {
  margin: 1.25rem 0;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  overflow-x: auto;
}

.code-snippet__pre {
  margin: 0;
  padding: 1rem;
  font-family: var(--mono-font);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text);
  background: transparent;
}

.code-snippet__pre code {
  display: block;
  white-space: pre;
}

/* code block stuff end */

.footer {
  margin: 3rem 0 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  max-width: var(--max-blog-width);
  text-align: center;
  line-height: 1.6;
}

.footer-label {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
}

.footer-link {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.footer-separator {
  color: var(--color-divider);
}

.footer-meta a {
  color: inherit;
  text-decoration: underline dotted var(--color-accent-soft);
}

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

@media screen and (max-width: 640px) {
  .footer {
    margin: 2.5rem 0 1.5rem;
    padding-top: 1.5rem;
  }

  .footer-label {
    display: none;
  }

  .footer-row {
    gap: 0.35rem;
  }
}

/*
  syntax theme
*/

.hljs {
  color: #24292e;
  background: transparent;
}

.hljs-doctag,
.hljs-keyword,
.hljs-meta .hljs-keyword,
.hljs-template-tag,
.hljs-template-variable,
.hljs-type,
.hljs-variable.language_ {
  /* prettylights-syntax-keyword */
  color: #d73a49;
}

.hljs-title,
.hljs-title.class_,
.hljs-title.class_.inherited__,
.hljs-title.function_ {
  /* prettylights-syntax-entity */
  color: #6f42c1;
}

.hljs-attr,
.hljs-attribute,
.hljs-literal,
.hljs-meta,
.hljs-number,
.hljs-operator,
.hljs-variable,
.hljs-selector-attr,
.hljs-selector-class,
.hljs-selector-id {
  /* prettylights-syntax-constant */
  color: #005cc5;
}

.hljs-regexp,
.hljs-string,
.hljs-meta .hljs-string {
  /* prettylights-syntax-string */
  color: #032f62;
}

.hljs-built_in,
.hljs-symbol {
  /* prettylights-syntax-variable */
  color: #e36209;
}

.hljs-comment,
.hljs-code,
.hljs-formula {
  /* prettylights-syntax-comment */
  color: #6a737d;
}

.hljs-name,
.hljs-quote,
.hljs-selector-tag,
.hljs-selector-pseudo {
  /* prettylights-syntax-entity-tag */
  color: #22863a;
}

.hljs-subst {
  /* prettylights-syntax-storage-modifier-import */
  color: #24292e;
}

.hljs-section {
  /* prettylights-syntax-markup-heading */
  color: #005cc5;
  font-weight: bold;
}

.hljs-bullet {
  /* prettylights-syntax-markup-list */
  color: #735c0f;
}

.hljs-emphasis {
  /* prettylights-syntax-markup-italic */
  color: #24292e;
  font-style: italic;
}

.hljs-strong {
  /* prettylights-syntax-markup-bold */
  color: #24292e;
  font-weight: bold;
}

.hljs-addition {
  /* prettylights-syntax-markup-inserted */
  color: #22863a;
  background-color: #f0fff4;
}

.hljs-deletion {
  /* prettylights-syntax-markup-deleted */
  color: #b31d28;
  background-color: #ffeef0;
}

html[data-theme="dark"] .hljs {
  color: #c9d1d9;
  background: transparent;
}

html[data-theme="dark"] .hljs-doctag,
html[data-theme="dark"] .hljs-keyword,
html[data-theme="dark"] .hljs-meta .hljs-keyword,
html[data-theme="dark"] .hljs-template-tag,
html[data-theme="dark"] .hljs-template-variable,
html[data-theme="dark"] .hljs-type,
html[data-theme="dark"] .hljs-variable.language_ {
  color: #ff7b72;
}

html[data-theme="dark"] .hljs-title,
html[data-theme="dark"] .hljs-title.class_,
html[data-theme="dark"] .hljs-title.class_.inherited__,
html[data-theme="dark"] .hljs-title.function_ {
  color: #d2a8ff;
}

html[data-theme="dark"] .hljs-attr,
html[data-theme="dark"] .hljs-attribute,
html[data-theme="dark"] .hljs-literal,
html[data-theme="dark"] .hljs-meta,
html[data-theme="dark"] .hljs-number,
html[data-theme="dark"] .hljs-operator,
html[data-theme="dark"] .hljs-variable,
html[data-theme="dark"] .hljs-selector-attr,
html[data-theme="dark"] .hljs-selector-class,
html[data-theme="dark"] .hljs-selector-id {
  color: #79c0ff;
}

html[data-theme="dark"] .hljs-regexp,
html[data-theme="dark"] .hljs-string,
html[data-theme="dark"] .hljs-meta .hljs-string {
  color: #a5d6ff;
}

html[data-theme="dark"] .hljs-built_in,
html[data-theme="dark"] .hljs-symbol {
  color: #ffa657;
}

html[data-theme="dark"] .hljs-comment,
html[data-theme="dark"] .hljs-code,
html[data-theme="dark"] .hljs-formula {
  color: #8b949e;
}

html[data-theme="dark"] .hljs-name,
html[data-theme="dark"] .hljs-quote,
html[data-theme="dark"] .hljs-selector-tag,
html[data-theme="dark"] .hljs-selector-pseudo {
  color: #7ee787;
}

html[data-theme="dark"] .hljs-subst {
  color: #c9d1d9;
}

html[data-theme="dark"] .hljs-section {
  color: #79c0ff;
  font-weight: bold;
}

html[data-theme="dark"] .hljs-bullet {
  color: #ffa657;
}

html[data-theme="dark"] .hljs-emphasis {
  color: #c9d1d9;
  font-style: italic;
}

html[data-theme="dark"] .hljs-strong {
  color: #c9d1d9;
  font-weight: bold;
}

html[data-theme="dark"] .hljs-addition {
  color: #7ee787;
  background-color: rgba(46, 160, 67, 0.2);
}

html[data-theme="dark"] .hljs-deletion {
  color: #f85149;
  background-color: rgba(248, 81, 73, 0.2);
}

.hljs-char.escape_,
.hljs-link,
.hljs-params,
.hljs-property,
.hljs-punctuation,
.hljs-tag {
  /* purposely ignored */
}