/* ==========================================================================
   Vigil Editorial Design System (WIRED-inspired)
   Single native CSS stylesheet — Light & Dark modes via CSS Custom Properties
   ========================================================================== */

:root {
  /* Typography — four faces, four jobs */
  --font-display: "Playfair Display", "Georgia", "Times New Roman", serif;
  --font-body:    "Lora", "Georgia", "Times New Roman", serif;
  --font-heading: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "JetBrains Mono", "SF Mono", "Consolas", "Menlo", monospace;
  --mermaid-font-family: "JetBrains Mono", monospace;

  /* Light Palette (Paper White default) */
  --w-bg:          #ffffff;
  --w-surface:     #f7f7f7;
  --w-navbar:      #ffffff;
  --w-border:      #e2e8f0;
  --w-rule-strong: #000000;
  --w-text:        #1a1a1a;
  --w-heading:     #1a1a1a;
  --w-muted:       #757575;
  --w-blue:        #057dbc;
  --w-blue-hv:     #045f94;
  --w-code-color:  #045f94;
  --w-footer-bg:   #1a1a1a;
  --w-footer-text: rgba(255, 255, 255, 0.72);

  /* Semantic Callouts (Light) */
  --w-note:      #057dbc;
  --w-tip:       #1a7f37;
  --w-caution:   #bc4c00;
  --w-warning:   #bf8700;
  --w-important: #cf222e;
}

html[data-theme="dark"] {
  --w-bg:          #111111;
  --w-surface:     #1a1a1a;
  --w-navbar:      #000000;
  --w-border:      #2a2a2a;
  --w-rule-strong: #ffffff;
  --w-text:        #e0e0e0;
  --w-heading:     #ffffff;
  --w-muted:       #888888;
  --w-blue:        #4db8e0;
  --w-blue-hv:     #7ccfed;
  --w-code-color:  #7ccfed;
  --w-footer-bg:   #111111;
  --w-footer-text: #888888;

  /* Semantic Callouts (Dark — desaturated) */
  --w-note:      #4db8e0;
  --w-tip:       #6ab187;
  --w-caution:   #d4956a;
  --w-warning:   #c9a84c;
  --w-important: #e07878;
}

/* ==========================================================================
   1. Base Reset & Typography
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  border-radius: 0 !important;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--w-bg);
  color: var(--w-text);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.58;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 150ms ease, color 150ms ease;
}

h1, h2 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--w-heading);
  text-wrap: balance;
  margin-top: 2.5rem;
  margin-bottom: 0.9rem;
}

h1 {
  font-size: clamp(2rem, 3vw + 1rem, 2.75rem);
  line-height: 1.06;
}

h2 {
  font-size: clamp(1.375rem, 1.4vw + 0.9rem, 1.625rem);
  line-height: 1.15;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--w-border);
}

h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--w-heading);
  text-wrap: balance;
  margin-top: 2rem;
  margin-bottom: 0.65rem;
}

h3 { font-size: clamp(1.175rem, 0.6vw + 1rem, 1.25rem); }
h4 { font-size: 1.125rem; }
h5 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
h6 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--w-muted);
}

p {
  margin-top: 0;
  margin-bottom: 1.3rem;
  text-wrap: pretty;
}

.article-body ul,
.article-body ol {
  margin-top: 0;
  margin-bottom: 1.3rem;
  padding-left: 1.4rem;
}

.article-body li {
  margin-bottom: 0.45rem;
  text-wrap: pretty;
}

.article-body li > ul,
.article-body li > ol {
  margin-top: 0.45rem;
  margin-bottom: 0.45rem;
}

.article-body li > p {
  margin-bottom: 0.5rem;
}

strong, b {
  font-weight: 600;
}

a {
  color: var(--w-blue);
  text-decoration: none;
  transition: color 150ms ease;
}

a:hover {
  color: var(--w-blue-hv);
}

#post-content a:not(.post-tag):hover {
  text-decoration: underline;
}

hr {
  border: none;
  border-top: 1px solid var(--w-border);
  margin: 2rem 0;
}

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

figure {
  margin: 1.75rem 0;
}

figcaption {
  color: var(--w-muted);
  font-style: italic;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  text-align: center;
}

blockquote, .blockquote {
  border-left: 2px solid var(--w-rule-strong) !important;
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--w-text);
}

:focus-visible {
  outline: 2px solid var(--w-blue);
  outline-offset: 2px;
  box-shadow: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ==========================================================================
   2. Navbar — Editorial Masthead
   ========================================================================== */

.navbar {
  background-color: var(--w-navbar);
  border-bottom: 1px solid var(--w-border);
  padding: 0.75rem 1.5rem;
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.navbar-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--w-heading) !important;
  position: relative;
  top: -5px;
}

.navbar-nav {
  display: flex;
  align-items: center;
}

.navbar .nav-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: var(--w-text);
  padding: 0.4rem 0.9rem;
}

.navbar .nav-link:hover {
  color: var(--w-blue);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.nav-icon, .theme-toggle {
  color: var(--w-muted);
  background: none;
  border: none;
  padding: 0.35rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 150ms ease;
}

.nav-icon:hover, .theme-toggle:hover {
  color: var(--w-blue);
}

html[data-theme="dark"] .icon-moon { display: none; }
html:not([data-theme="dark"]) .icon-sun { display: none; }

/* ==========================================================================
   3. Main Layout Containers
   ========================================================================== */

.main-container {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ==========================================================================
   4. Homepage Listing & Tags Sidebar
   ========================================================================== */

.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 3rem;
  align-items: start;
}

.listing-column,
.sidebar-column {
  min-width: 0;
  max-width: 100%;
}

.post-list .post-card {
  display: grid;
  grid-template-columns: 125px minmax(0, 1fr) 180px;
  gap: 1.5rem;
  align-items: start;
  border-bottom: 1px solid var(--w-border);
  padding-bottom: 1.35rem;
  margin-bottom: 1.35rem;
}

.post-list .post-card:last-child {
  border-bottom: none;
}

.post-list .post-card-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: var(--w-muted);
  padding-top: 0.2rem;
}

.post-list .post-card-meta a {
  color: var(--w-muted);
}

.post-list .post-card-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-wrap: break-word;
}

.post-list h3.post-card-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.25rem, 0.8vw + 1rem, 1.375rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-wrap: balance;
  margin: 0;
}

.post-list h3.post-card-title a {
  color: var(--w-heading);
}

.post-list h3.post-card-title a:hover {
  color: var(--w-blue);
}

.post-list .post-card-desc {
  font-family: var(--font-body);
  color: var(--w-muted);
  font-size: 0.95rem;
  line-height: 1.45;
  margin-top: 0.5rem;
}

.post-list .post-card-desc p {
  margin-bottom: 0;
}

.post-list .post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.6rem;
}

.post-tag {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.9px;
  font-size: 0.68rem;
  color: var(--w-muted);
  border: 1px solid var(--w-border);
  background: transparent;
  padding: 0.15rem 0.45rem;
  display: inline-block;
}

.post-tag:hover {
  color: var(--w-blue);
  border-color: var(--w-blue);
}

.post-list .post-card-thumb img {
  width: 180px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--w-border);
}

/* Tags Sidebar */
.tag-nav-title {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.9px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--w-heading);
  border-bottom: 2px solid var(--w-rule-strong);
  padding-bottom: 0.5rem;
  margin-bottom: 0.75rem;
}

.tag-nav .tag-link {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  font-size: 0.7rem;
  color: var(--w-muted);
  border-bottom: 1px solid var(--w-border);
  padding: 0.4rem 0;
  display: flex;
  justify-content: space-between;
}

.tag-nav .tag-link:hover {
  color: var(--w-blue);
}

.tag-nav .tag-link.active {
  color: var(--w-heading);
  font-weight: 700;
}

/* Pagination */
.pagination-nav {
  margin-top: 2rem;
}

.pagination {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.page-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: 1px solid var(--w-border);
  background-color: var(--w-surface);
  color: var(--w-text);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}

.page-item.active .page-link {
  border-color: var(--w-rule-strong);
  font-weight: 700;
}

.page-item.disabled .page-link {
  color: var(--w-muted);
  opacity: 0.5;
  cursor: default;
}

.page-item:not(.disabled) .page-link:hover {
  color: var(--w-blue);
  border-color: var(--w-blue);
}

/* ==========================================================================
   5. Single Post & Left Sticky Table of Contents
   ========================================================================== */

.article-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 700px);
  gap: 4rem;
  align-items: start;
  justify-content: center;
}

.article-layout.no-toc {
  display: block;
  max-width: 700px;
  margin: 0 auto;
}

.article-main,
.article-body {
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

.sidebar.toc-left {
  position: sticky;
  top: 2rem;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  min-width: 0;
}

#TOC {
  font-family: var(--font-heading);
  font-size: 0.85rem;
}

#toc-title {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.9px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--w-heading);
  border-bottom: 2px solid var(--w-rule-strong);
  padding-bottom: 0.5rem;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

#TableOfContents ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

#TableOfContents ul ul {
  padding-left: 0.85rem;
}

/* Start nested subsections collapsed; expand active H2 section while scrolling */
#TableOfContents > ul > li > ul {
  display: none;
}

#TableOfContents > ul > li.toc-expanded > ul {
  display: block;
}

#TableOfContents li {
  margin: 0.25rem 0;
}

#TableOfContents a {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  color: var(--w-muted);
  padding: 0.15rem 0.4rem;
  border-left: 2px solid transparent;
  text-decoration: none !important;
  transition: color 150ms ease, border-color 150ms ease;
}

#TableOfContents a:hover {
  color: var(--w-blue);
}

#TableOfContents a.active {
  color: var(--w-heading);
  font-weight: 600;
  border-left-color: var(--w-rule-strong);
}

/* Editorial Post Header */
.post-header {
  margin-bottom: 2rem;
}

.post-title-group .post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1rem;
}

.post-title-group h1.title {
  margin-top: 0;
  margin-bottom: 0.55rem;
  overflow-wrap: break-word;
}

.post-title-group .description {
  font-family: var(--font-body);
  font-style: italic;
  color: var(--w-muted);
  font-size: clamp(1.05rem, 0.5vw + 0.95rem, 1.2rem);
  line-height: 1.5;
  text-wrap: pretty;
  margin-top: 0.55rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2.5rem;
  font-variant-numeric: tabular-nums;
  margin-top: 1.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--w-border);
}

.post-meta-label {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.9px;
  font-size: 0.72rem;
  color: var(--w-muted);
}

.post-meta-value p {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  margin: 0.15rem 0 0;
}

/* ==========================================================================
   6. Code, Syntax Highlighting (Chroma), Tables, Callouts & Mermaid
   ========================================================================== */

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--w-surface);
  color: var(--w-code-color);
  padding: 0.12em 0.35em;
  overflow-wrap: break-word;
}

.highlight {
  max-width: 100%;
  overflow-x: auto;
  margin: 1.35rem 0;
}

.highlight pre {
  margin: 0;
}

pre {
  background-color: var(--w-surface) !important;
  color: var(--w-text);
  border: 1px solid var(--w-border);
  padding: 1rem 1.15rem;
  line-height: 1.55;
  tab-size: 2;
  max-width: 100%;
  overflow-x: auto;
  margin: 1.35rem 0;
  -webkit-text-size-adjust: none;
}

pre code {
  font-size: 0.875rem;
  line-height: 1.55;
  background: none;
  color: inherit;
  padding: 0;
  overflow-wrap: normal;
  word-wrap: normal;
}

/* Native Hugo Chroma Syntax Highlighting — Light Mode (github) */
.chroma .lnlinks { outline: none; text-decoration: none; color: inherit; }
.chroma .lntd { vertical-align: top; padding: 0; margin: 0; border: 0; }
.chroma .lntable { border-spacing: 0; padding: 0; margin: 0; border: 0; }
.chroma .lnt, .chroma .ln { white-space: pre; user-select: none; margin-right: 0.4em; padding: 0 0.4em; color: var(--w-muted); }
.chroma .line { display: flex; }

:root:not([data-theme="dark"]) .chroma .err { color: #f6f8fa; background-color: #82071e; }
:root:not([data-theme="dark"]) .chroma .hl { background-color: #dedede; }
:root:not([data-theme="dark"]) .chroma .k,
:root:not([data-theme="dark"]) .chroma .kc,
:root:not([data-theme="dark"]) .chroma .kd,
:root:not([data-theme="dark"]) .chroma .kn,
:root:not([data-theme="dark"]) .chroma .kp,
:root:not([data-theme="dark"]) .chroma .kr,
:root:not([data-theme="dark"]) .chroma .kt { color: #cf222e; }
:root:not([data-theme="dark"]) .chroma .na,
:root:not([data-theme="dark"]) .chroma .nc,
:root:not([data-theme="dark"]) .chroma .nx,
:root:not([data-theme="dark"]) .chroma .p,
:root:not([data-theme="dark"]) .chroma .ge,
:root:not([data-theme="dark"]) .chroma .go { color: #1f2328; }
:root:not([data-theme="dark"]) .chroma .no,
:root:not([data-theme="dark"]) .chroma .nd,
:root:not([data-theme="dark"]) .chroma .nt,
:root:not([data-theme="dark"]) .chroma .m,
:root:not([data-theme="dark"]) .chroma .mb,
:root:not([data-theme="dark"]) .chroma .mf,
:root:not([data-theme="dark"]) .chroma .mh,
:root:not([data-theme="dark"]) .chroma .mi,
:root:not([data-theme="dark"]) .chroma .il,
:root:not([data-theme="dark"]) .chroma .mo,
:root:not([data-theme="dark"]) .chroma .o,
:root:not([data-theme="dark"]) .chroma .ow,
:root:not([data-theme="dark"]) .chroma .or { color: #0550ae; }
:root:not([data-theme="dark"]) .chroma .ni,
:root:not([data-theme="dark"]) .chroma .nb,
:root:not([data-theme="dark"]) .chroma .nf,
:root:not([data-theme="dark"]) .chroma .fm { color: #6639ba; }
:root:not([data-theme="dark"]) .chroma .nl { color: #900; font-weight: bold; }
:root:not([data-theme="dark"]) .chroma .nn { color: #24292e; }
:root:not([data-theme="dark"]) .chroma .bp { color: #6a737d; }
:root:not([data-theme="dark"]) .chroma .nv,
:root:not([data-theme="dark"]) .chroma .vc,
:root:not([data-theme="dark"]) .chroma .vg,
:root:not([data-theme="dark"]) .chroma .vi,
:root:not([data-theme="dark"]) .chroma .vm { color: #953800; }
:root:not([data-theme="dark"]) .chroma .s,
:root:not([data-theme="dark"]) .chroma .sa,
:root:not([data-theme="dark"]) .chroma .sb,
:root:not([data-theme="dark"]) .chroma .sc,
:root:not([data-theme="dark"]) .chroma .dl,
:root:not([data-theme="dark"]) .chroma .sd,
:root:not([data-theme="dark"]) .chroma .s2,
:root:not([data-theme="dark"]) .chroma .se,
:root:not([data-theme="dark"]) .chroma .sh,
:root:not([data-theme="dark"]) .chroma .si,
:root:not([data-theme="dark"]) .chroma .sx,
:root:not([data-theme="dark"]) .chroma .sr,
:root:not([data-theme="dark"]) .chroma .s1 { color: #0a3069; }
:root:not([data-theme="dark"]) .chroma .ss { color: #032f62; }
:root:not([data-theme="dark"]) .chroma .c,
:root:not([data-theme="dark"]) .chroma .ch,
:root:not([data-theme="dark"]) .chroma .cm,
:root:not([data-theme="dark"]) .chroma .c1,
:root:not([data-theme="dark"]) .chroma .cs,
:root:not([data-theme="dark"]) .chroma .cp,
:root:not([data-theme="dark"]) .chroma .cpf { color: #57606a; font-style: italic; }
:root:not([data-theme="dark"]) .chroma .gd { color: #82071e; background-color: #ffebe9; }
:root:not([data-theme="dark"]) .chroma .gi { color: #116329; background-color: #dafbe1; }
:root:not([data-theme="dark"]) .chroma .gl { text-decoration: underline; }

/* Native Hugo Chroma Syntax Highlighting — Dark Mode (github-dark) */
html[data-theme="dark"] .chroma .err { color: #f85149; }
html[data-theme="dark"] .chroma .hl { background-color: #6e7681; }
html[data-theme="dark"] .chroma .k,
html[data-theme="dark"] .chroma .kd,
html[data-theme="dark"] .chroma .kn,
html[data-theme="dark"] .chroma .kr,
html[data-theme="dark"] .chroma .kt,
html[data-theme="dark"] .chroma .nn,
html[data-theme="dark"] .chroma .gt { color: #ff7b72; }
html[data-theme="dark"] .chroma .kc,
html[data-theme="dark"] .chroma .kp,
html[data-theme="dark"] .chroma .py,
html[data-theme="dark"] .chroma .nv,
html[data-theme="dark"] .chroma .vc,
html[data-theme="dark"] .chroma .vg,
html[data-theme="dark"] .chroma .vi,
html[data-theme="dark"] .chroma .vm,
html[data-theme="dark"] .chroma .ld,
html[data-theme="dark"] .chroma .sa,
html[data-theme="dark"] .chroma .dl,
html[data-theme="dark"] .chroma .se,
html[data-theme="dark"] .chroma .sh,
html[data-theme="dark"] .chroma .sr,
html[data-theme="dark"] .chroma .gu { color: #79c0ff; }
html[data-theme="dark"] .chroma .nc,
html[data-theme="dark"] .chroma .ne { color: #f0883e; font-weight: bold; }
html[data-theme="dark"] .chroma .no,
html[data-theme="dark"] .chroma .nl,
html[data-theme="dark"] .chroma .gh { color: #79c0ff; font-weight: bold; }
html[data-theme="dark"] .chroma .nd,
html[data-theme="dark"] .chroma .nf,
html[data-theme="dark"] .chroma .fm { color: #d2a8ff; font-weight: bold; }
html[data-theme="dark"] .chroma .ni,
html[data-theme="dark"] .chroma .nb { color: #ffa657; }
html[data-theme="dark"] .chroma .nx,
html[data-theme="dark"] .chroma .na,
html[data-theme="dark"] .chroma .p { color: #e6edf3; }
html[data-theme="dark"] .chroma .nt { color: #7ee787; }
html[data-theme="dark"] .chroma .l,
html[data-theme="dark"] .chroma .s,
html[data-theme="dark"] .chroma .sb,
html[data-theme="dark"] .chroma .sc,
html[data-theme="dark"] .chroma .sd,
html[data-theme="dark"] .chroma .s2,
html[data-theme="dark"] .chroma .si,
html[data-theme="dark"] .chroma .sx,
html[data-theme="dark"] .chroma .s1,
html[data-theme="dark"] .chroma .ss,
html[data-theme="dark"] .chroma .m,
html[data-theme="dark"] .chroma .mb,
html[data-theme="dark"] .chroma .mf,
html[data-theme="dark"] .chroma .mh,
html[data-theme="dark"] .chroma .mi,
html[data-theme="dark"] .chroma .il,
html[data-theme="dark"] .chroma .mo { color: #a5d6ff; }
html[data-theme="dark"] .chroma .o,
html[data-theme="dark"] .chroma .ow,
html[data-theme="dark"] .chroma .or { color: #ff7b72; font-weight: bold; }
html[data-theme="dark"] .chroma .c,
html[data-theme="dark"] .chroma .ch,
html[data-theme="dark"] .chroma .cm,
html[data-theme="dark"] .chroma .c1 { color: #8b949e; font-style: italic; }
html[data-theme="dark"] .chroma .cs,
html[data-theme="dark"] .chroma .cp,
html[data-theme="dark"] .chroma .cpf { color: #8b949e; font-weight: bold; font-style: italic; }
html[data-theme="dark"] .chroma .gd { color: #ffa198; background-color: #490202; }
html[data-theme="dark"] .chroma .ge { font-style: italic; }
html[data-theme="dark"] .chroma .gr { color: #ffa198; }
html[data-theme="dark"] .chroma .gi { color: #56d364; background-color: #0f5323; }
html[data-theme="dark"] .chroma .go,
html[data-theme="dark"] .chroma .gp,
html[data-theme="dark"] .chroma .bp { color: #8b949e; }
html[data-theme="dark"] .chroma .gs { font-weight: bold; }
html[data-theme="dark"] .chroma .gl { text-decoration: underline; }

/* Tables */
table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}

th, td {
  border-bottom: 1px solid var(--w-border);
  padding: 0.6rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

th {
  font-family: var(--font-heading);
  font-weight: 700;
  border-bottom: 2px solid var(--w-rule-strong);
}

/* Callouts */
.callout {
  border: 1px solid var(--w-border);
  border-left-width: 2px;
  background-color: var(--w-surface);
  margin: 1.5rem 0;
  padding: 0.9rem 1.15rem;
}

.callout-header {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

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

.callout-note      { border-left-color: var(--w-note); }
.callout-tip       { border-left-color: var(--w-tip); }
.callout-caution   { border-left-color: var(--w-caution); }
.callout-warning   { border-left-color: var(--w-warning); }
.callout-important { border-left-color: var(--w-important); }

.callout-note .callout-header      { color: var(--w-note); }
.callout-tip .callout-header       { color: var(--w-tip); }
.callout-caution .callout-header   { color: var(--w-caution); }
.callout-warning .callout-header   { color: var(--w-warning); }
.callout-important .callout-header { color: var(--w-important); }

/* Mermaid */
.mermaid-container {
  margin: 1.5rem 0;
  text-align: center;
  max-width: 100%;
  overflow-x: auto;
}

pre.mermaid {
  background: transparent !important;
  border: none !important;
  text-align: center;
}

.labelBkg, .edgeLabel p {
  background: none !important;
}

/* ==========================================================================
   7. Citation, License Appendix & 404
   ========================================================================== */

#post-appendix {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--w-border);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  max-width: 100%;
  overflow-wrap: break-word;
}

.appendix-section {
  margin-bottom: 1.5rem;
}

.appendix-heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: none;
  margin-top: 0;
  margin-bottom: 0.25rem;
}

.appendix-license {
  color: var(--w-muted);
  font-size: 0.85rem;
  margin-top: 0;
  margin-bottom: 0.85rem;
}

.appendix-label {
  color: var(--w-muted);
  font-size: 0.85rem;
  margin-top: 0;
  margin-bottom: 0.3rem;
}

.appendix-citeas {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.55;
  background-color: var(--w-surface);
  border: 1px solid var(--w-border);
  padding: 0.75rem 1rem;
  margin-top: 0;
  margin-bottom: 1.25rem;
  overflow-wrap: break-word;
  word-break: break-word;
}

.appendix-bibtex {
  padding: 0.75rem 1rem;
  margin: 0 !important;
}

.appendix-bibtex code {
  font-size: 0.78rem;
  line-height: 1.55;
}

.error-404 {
  max-width: 34rem;
  margin: 7rem auto 9rem;
  padding: 0 1.5rem;
  text-align: center;
}

.error-404-code {
  display: block;
  font-size: 6rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  opacity: 0.22;
  font-family: var(--font-heading);
}

.error-404-title {
  display: block;
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0.5rem 0 0.4rem;
  font-family: var(--font-heading);
}

.error-404-desc {
  display: block;
  opacity: 0.7;
  margin-bottom: 2rem;
}

.error-404-links {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.9px;
}

/* ==========================================================================
   8. Footer
   ========================================================================== */

.nav-footer {
  background-color: var(--w-footer-bg);
  color: var(--w-footer-text);
  border-top: 1px solid var(--w-border);
  padding: 2rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-align: center;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.nav-footer p {
  margin: 0;
  color: var(--w-footer-text);
}

/* ==========================================================================
   9. Responsive Breakpoints
   ========================================================================== */

@media (max-width: 991.98px) {
  .home-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
  }

  .sidebar-column {
    order: -1;
  }

  .tag-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
  }

  .tag-nav-title {
    width: 100%;
    margin-bottom: 0.35rem;
  }

  .tag-nav .tag-link {
    border: 1px solid var(--w-border);
    padding: 0.25rem 0.55rem;
    gap: 0.3rem;
  }

  .article-layout {
    display: block;
    max-width: 700px;
    margin: 0 auto;
  }

  .sidebar.toc-left {
    display: none;
  }
}

@media (max-width: 767.98px) {
  body {
    font-size: 1.0625rem;
    line-height: 1.54;
  }

  .navbar {
    padding: 0.65rem 1rem;
  }

  .navbar-inner {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .navbar-left {
    gap: 0.75rem;
  }

  .navbar .nav-link {
    padding: 0.35rem 0.5rem;
  }

  .navbar-right {
    gap: 0.5rem;
  }

  .main-container {
    padding: 1.5rem 1.15rem 3rem;
  }

  .post-list .post-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-bottom: 1.25rem;
    margin-bottom: 1.25rem;
  }

  .post-list .post-card .post-card-thumb {
    order: 1;
    width: 100%;
    margin-bottom: 0.25rem;
  }

  .post-list .post-card .post-card-thumb img {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .post-list .post-card .post-card-meta {
    order: 2;
    padding-top: 0;
  }

  .post-list .post-card .post-card-body {
    order: 3;
    width: 100%;
  }

  .article-body table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  blockquote, .blockquote {
    padding-left: 1rem;
  }

  .callout {
    padding: 0.8rem 1rem;
  }
}