:root {
  /* Colors */
  --color-bg: #fdfdfc;
  --color-text: #1a1a1a;
  --color-text-muted: #525252;
  --color-primary: #0055ff;
  --color-primary-hover: #0033cc;
  --color-border: #e5e5e5;
  --color-bg-card: #ffffff;
  --color-bg-code: #1e1e1e;
  --color-text-code: #d4d4d4;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;

  /* Layout */
  --container-width: 800px;
  --border-radius: 6px;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-top: 0;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* ==========================================================================
   Layout & Containers
   ========================================================================== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.site-header {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  padding: 0;
  margin: 0;
}

.site-nav a {
  color: var(--color-text-muted);
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.site-footer {
  margin-top: var(--space-xl);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Hero Section */
.hero {
  margin-bottom: var(--space-xl);
}

.hero-subtitle {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 600;
  display: block;
  margin-bottom: var(--space-sm);
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

/* Cards (for case studies list) */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 600px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.card-title a {
  color: var(--color-text);
}

.card-title a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.card-desc {
  flex-grow: 1;
  font-size: 0.95rem;
}

.card-meta {
  margin-top: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* Code Blocks & Preformatted Text */
pre {
  background-color: var(--color-bg-code);
  color: var(--color-text-code);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: var(--space-md);
  border-radius: var(--border-radius);
  overflow-x: auto;
  line-height: 1.4;
  margin-bottom: var(--space-md);
}

code {
  font-family: var(--font-mono);
  background-color: var(--color-border);
  padding: 0.1em 0.3em;
  border-radius: 3px;
  font-size: 0.9em;
  color: var(--color-text);
}

pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  color: inherit;
}

/* Case Study Content Styles */
.case-study-header {
  margin-bottom: var(--space-lg);
}

.case-study-meta {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
  display: flex;
  gap: var(--space-md);
}

.case-study-section {
  margin-bottom: var(--space-xl);
}

.case-study-section h2 {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--space-xs);
  margin-bottom: var(--space-md);
}

.case-study-section h3 {
  font-size: 1.25rem;
  margin-top: var(--space-lg);
}

ul, ol {
  margin-top: 0;
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  color: var(--color-text-muted);
}

li {
  margin-bottom: var(--space-xs);
}