:root {
  --bg-primary: #fafaf7; /* Editorial off-white/cream paper */
  --bg-secondary: #f0eee8; /* Muted paper background */
  --bg-card: #ffffff;
  --text-primary: #111111; /* Sharp charcoal black */
  --text-secondary: #4a4a4a; /* Dark gray for readable text */
  --text-muted: #767676;
  --accent-color: #1a4254; /* Slate deep blue */
  --accent-rust: #b33927; /* Accent rust red */
  --border-color: #d1cdc0; /* Muted warm grey for line drawings */
  --border-light: #e6e4de;
  --max-width: 1100px;
  
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.75rem 1rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  z-index: 20;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

/* Header styling */
.site-header {
  border-bottom: 2px solid var(--text-primary);
  padding: 1.5rem 0;
  background-color: var(--bg-primary);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.logo {
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.8rem;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
}

.logo-symbol {
  font-family: var(--font-serif);
  color: var(--accent-rust);
  margin-right: 0.4rem;
  font-size: 1.6rem;
}

.logo-dot {
  color: var(--accent-rust);
}

.main-nav {
  display: flex;
  gap: 1.5rem;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--accent-rust);
  border-bottom: 1px solid var(--accent-rust);
}

/* Main Layout */
.site-main {
  flex-grow: 1;
}

/* Hero Section */
.hero-section {
  border-bottom: 1px solid var(--border-color);
  padding: 4rem 0;
  background-color: var(--bg-card);
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.k-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--accent-rust);
  text-transform: uppercase;
  font-weight: bold;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.hero-visual {
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  border-radius: 4px;
  padding: 1.5rem;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.network-graph {
  max-width: 100%;
  max-height: 100%;
}

/* Content Section & Articles */
.content-section {
  padding: 4rem 0;
}

.content-container {
  display: block;
}

.article-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 4rem;
}

.main-articles {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.main-articles h1 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  border-bottom: 2px solid var(--text-primary);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
  margin-top: 1rem;
}

.main-articles h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--accent-color);
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.25rem;
}

.main-articles h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--accent-rust);
}

.main-articles p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.main-articles hr {
  border: none;
  border-top: 1px double var(--border-color);
  margin: 3rem 0;
  height: 3px;
}

.main-articles a {
  color: var(--accent-color);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

.main-articles a:hover {
  color: var(--accent-rust);
}

.main-articles ul, .main-articles ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.main-articles li {
  margin-bottom: 0.5rem;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.sidebar-block {
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: 4px;
}

.block-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  font-weight: bold;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.stats-table th {
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  color: var(--text-muted);
}

.stats-table td {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-light);
}

.stats-table tr:last-child td {
  border-bottom: none;
}

.stats-table td:last-child {
  text-align: right;
  font-weight: bold;
}

.callout-block {
  border-left: 4px solid var(--accent-rust);
}

.callout-block p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

/* Buttons */
.btn-secondary {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  text-decoration: none;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.75rem 1.25rem;
  border-radius: 3px;
  font-weight: bold;
  letter-spacing: 0.05em;
  transition: background-color 0.15s ease;
}

.btn-secondary:hover {
  background-color: var(--accent-rust);
}

/* Page Headers */
.page-header {
  border-bottom: 1px solid var(--border-color);
  padding: 3.5rem 0;
  background-color: var(--bg-card);
}

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

.page-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

.content-container-narrow {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 2rem;
}

.page-content {
  font-size: 1.1rem;
  line-height: 1.7;
}

.page-content p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

/* Contact Page Grid & Form */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 4rem;
}

.contact-intro {
  font-size: 1.05rem;
  line-height: 1.6;
}

.contact-intro h2 {
  font-family: var(--font-serif);
  margin-bottom: 1rem;
}

.contact-form-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: 4px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: bold;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  background-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(26, 66, 84, 0.15);
}

.btn-submit {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: bold;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  padding: 1rem 2rem;
  border-radius: 3px;
  cursor: pointer;
  align-self: flex-start;
  transition: background-color 0.15s ease;
}

.btn-submit:hover {
  background-color: var(--accent-rust);
}

/* Thanks styling */
.thanks-header {
  border-bottom: 2px solid var(--accent-rust);
}

.thanks-content {
  padding: 2rem 0;
  text-align: center;
}

.thanks-content a {
  display: inline-block;
  margin-top: 2rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--accent-rust);
  text-decoration: none;
  font-weight: bold;
  border: 1px solid var(--accent-rust);
  padding: 0.75rem 1.5rem;
  border-radius: 3px;
  transition: all 0.2s ease;
}

.thanks-content a:hover {
  background-color: var(--accent-rust);
  color: #ffffff;
}

/* Footer */
.site-footer {
  background-color: var(--text-primary);
  color: #c9c9c9;
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 0.6fr 1.4fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  color: #ffffff;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.footer-brand .tagline {
  font-size: 0.9rem;
  line-height: 1.4;
}

.footer-links h4,
.footer-status h4 {
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #c9c9c9;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--accent-rust);
}

.footer-status p {
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid #333333;
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #888888;
}

/* Mobile Responsiveness */
@media (max-width: 850px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero-visual {
    order: -1;
    max-width: 350px;
    margin: 0 auto;
    width: 100%;
  }
  
  .article-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .form-row {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 500px) {
  .container {
    padding: 0 1rem;
  }
  
  .header-container {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .page-title {
    font-size: 2rem;
  }
}