:root {
  --heading-font-family: 'Inter', -apple-system, sans-serif;
  --body-font-family: 'Inter', -apple-system, sans-serif;
  --mono-font-family: 'JetBrains Mono', monospace;

  /* Type Scale (Software Catalog) */
  --heading-xxl: 32px;
  --heading-xl: 26px;
  --heading-lg: 20px;
  --heading-md: 18px;
  --body: 15px;
  --body-sm: 13px;

  --line-height-heading: 1.2;
  --line-height-body: 1.65;

  /* Earthy Green Palette */
  --color-bg: #FAFBF9; /* Solid high-key warm off-white */
  --color-surface: #CAD2C5; /* Lichen */
  --color-border: #84A98C; /* Solid Sage */
  --color-fg: #2F3E46; /* Loam */
  --color-fg-muted: #52796F; /* Moss */
  --color-accent: #354F52; /* Canopy */
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 36px;
  --spacing-2xl: 56px;

  --max-width: 720px;
  --radius: 4px; /* Harder corners for software look */
}

/* Base resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--body-font-family);
  font-size: var(--body);
  line-height: var(--line-height-body);
  padding: var(--spacing-xl) var(--spacing-lg);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Header & Logo */
header {
  margin-bottom: var(--spacing-2xl);
  border-bottom: 2px solid var(--color-fg);
  padding-bottom: var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--mono-font-family);
  font-weight: 700;
  font-size: 16px;
  color: var(--color-accent);
  text-decoration: none;
  display: inline-block;
}

.logo::before {
  content: "// ";
  color: var(--color-border);
}

/* Sections & Spacers */
section {
  margin-bottom: var(--spacing-2xl);
}

/* Technical dividers */
.tech-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--spacing-2xl) 0;
  position: relative;
}

.tech-divider::after {
  content: "[ vdua.io ]";
  position: absolute;
  top: -9px;
  right: 24px;
  background-color: var(--color-bg);
  padding: 0 8px;
  font-family: var(--mono-font-family);
  font-size: 11px;
  color: var(--color-border);
}

.tech-divider.eof::after {
  content: "[ EOF ]";
}

/* Section Title */
.section-title {
  font-family: var(--mono-font-family);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--color-fg-muted);
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-title::before {
  content: "■";
  font-size: 8px;
  color: var(--color-border);
}

/* Hero layout */
.hero-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  background-color: #fff;
}

/* Hero layout is stacked by default so the hero image displays as a prominent, full-width element. */

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-content h1 {
  font-family: var(--heading-font-family);
  font-size: var(--heading-xxl);
  line-height: var(--line-height-heading);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero-subhead {
  font-size: var(--body);
  color: var(--color-fg);
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

.btn {
  display: inline-block;
  font-family: var(--mono-font-family);
  font-size: var(--body-sm);
  font-weight: 500;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: all 0.15s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #F5F7F4;
  border: none;
}

.btn-primary:hover {
  background-color: var(--color-fg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-fg-muted);
  border: 1px solid var(--color-border);
  margin-left: var(--spacing-sm);
}

.btn-secondary:hover {
  background-color: rgba(132, 169, 140, 0.05);
  border-color: var(--color-fg-muted);
}

.hero-image-wrapper {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.hero-image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
}

/* Post list & Card Refinements */
.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.post-card {
  display: block;
  border: 1px solid rgba(132, 169, 140, 0.2);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  background-color: #fff;
  transition: border-color 0.15s ease;
}

.post-card:hover {
  border-color: var(--color-border);
}

.post-meta {
  font-family: var(--mono-font-family);
  font-size: 11px;
  color: var(--color-fg-muted);
  margin-bottom: var(--spacing-xs);
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.post-category {
  font-weight: 500;
}

.post-card h3 {
  font-family: var(--heading-font-family);
  font-size: var(--heading-md);
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.post-title-link {
  color: var(--color-accent);
  text-decoration: none;
}

.post-title-link:hover {
  color: var(--color-fg-muted);
  text-decoration: underline;
}

.post-excerpt {
  font-size: var(--body);
  color: var(--color-fg);
  opacity: 0.8;
}

.post-action {
  font-family: var(--mono-font-family);
  font-size: 12px;
  color: var(--color-fg-muted);
  margin-top: var(--spacing-sm);
  display: inline-block;
  border-bottom: 1px dashed var(--color-border);
  text-decoration: none;
  transition: color 0.15s ease;
}

.post-action:hover {
  color: var(--color-accent);
  border-bottom-style: solid;
}

/* More Pagination widget */
.pagination-container {
  margin-top: var(--spacing-xl);
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--mono-font-family);
  font-size: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.more-prompt {
  color: #fff;
  background-color: var(--color-accent);
  padding: 2px 8px;
  border-radius: 2px;
}

.pagination-nav a {
  color: var(--color-fg-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--color-border);
}

.pagination-nav a:hover {
  color: var(--color-accent);
  border-bottom-style: solid;
}

/* Tags / Pills */
.tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag-pill {
  display: inline-block;
  font-family: var(--mono-font-family);
  font-size: 11px;
  padding: 2px 8px;
  background-color: #fff;
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all 0.15s ease;
}

.tag-pill:hover {
  background-color: var(--color-border);
  color: #fff;
}

.tag-pill.is-active {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* About Card / Biography */
.about-card {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
}

.about-bio {
  font-size: var(--body);
  opacity: 0.9;
  margin-bottom: var(--spacing-md);
}

.about-links {
  display: flex;
  gap: var(--spacing-md);
}

.about-link {
  font-family: var(--mono-font-family);
  font-size: var(--body-sm);
  color: var(--color-fg-muted);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px dashed var(--color-border);
}

.about-link:hover {
  color: var(--color-accent);
  border-bottom-style: solid;
}

/* Main Prose / Reading Column */
article {
  max-width: 100%; /* Matches the container, header, and footer widths */
  margin: 0 auto;
}

article h1 {
  font-family: var(--heading-font-family);
  font-size: var(--heading-xxl);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
  letter-spacing: -0.03em;
}

article h2 {
  font-family: var(--heading-font-family);
  font-size: var(--heading-lg);
  color: var(--color-accent);
  margin: var(--spacing-xl) 0 var(--spacing-md);
  font-weight: 600;
  letter-spacing: -0.02em;
  border-bottom: 1px solid rgba(132, 169, 140, 0.2);
  padding-bottom: var(--spacing-xs);
}

article p {
  margin-bottom: var(--spacing-md);
  opacity: 0.95;
}

article ul,
article ol {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

article ul {
  list-style-type: square; /* High-contrast technical square bullets */
}

article ol {
  list-style-type: decimal;
}

article li {
  margin-bottom: var(--spacing-xs);
  line-height: var(--line-height-body);
  opacity: 0.95;
  padding-left: var(--spacing-xs);
}

/* Ensure strong styling inside lists inherits correct color */
article li strong {
  color: var(--color-accent);
}

/* Nested lists */
article ul ul,
article ul ol,
article ol ul,
article ol ol {
  margin-top: var(--spacing-xs);
  margin-bottom: 0;
  padding-left: var(--spacing-md);
}

/* Back navigation cd .. */
.back-nav {
  margin-bottom: var(--spacing-xl);
  font-family: var(--mono-font-family);
  font-size: var(--body-sm);
}

.back-link {
  color: var(--color-fg-muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* Article Metadata */
.article-meta {
  font-family: var(--mono-font-family);
  font-size: 12px;
  color: var(--color-fg-muted);
  margin-bottom: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.article-category {
  font-weight: 600;
}

/* Code highlight override */
.code-block-wrapper {
  margin: var(--spacing-lg) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: #1E2629; /* Deep earthy charcoal/forest background */
}

.code-header {
  background-color: #242E30; /* Slightly lighter dark shade for clear visual hierarchy */
  border-bottom: 1px solid var(--color-accent);
  padding: 8px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono-font-family);
  font-size: 11px;
  color: var(--color-surface); /* Lichen */
}

.btn-copy {
  background: transparent;
  border: 1px solid rgba(202, 210, 197, 0.3);
  color: var(--color-surface);
  padding: 2px 8px;
  border-radius: 3px;
  cursor: pointer;
  font-family: var(--mono-font-family);
  font-size: 10px;
  transition: all 0.15s ease;
}

.btn-copy:hover {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

pre {
  padding: var(--spacing-md);
  overflow-x: auto;
  font-family: var(--mono-font-family);
  font-size: 13px;
  line-height: 1.5;
  color: #FAFBF9; /* High-contrast warm off-white default text */
}

code.inline-code {
  font-family: var(--mono-font-family);
  font-size: 13px;
  background-color: rgba(202, 210, 197, 0.3);
  color: var(--color-accent);
  padding: 2px 6px;
  border-radius: 3px;
}

/* Series Navigation (Chosen Borderless Variant 1: tree Motif) */
.series-nav-box {
  font-family: var(--mono-font-family);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-fg-muted);
  margin: var(--spacing-md) 0 var(--spacing-xl);
  padding-left: var(--spacing-sm);
}


.series-active-title {
  color: var(--color-fg);
  font-weight: 600;
}

.series-link {
  color: var(--color-fg-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--color-border);
}

.series-link:hover {
  color: var(--color-accent);
  border-bottom-style: solid;
}

/* Footer layout */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono-font-family);
  font-size: 11px;
  color: var(--color-fg-muted);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: inherit;
  text-decoration: none;
}

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