:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-primary: #0052cc;
  /* Tech Blue */
  --color-primary-hover: #003d99;
  --color-secondary: #6b7280;
  --color-accent: #10b981;
  /* Success Green */
  --color-border: #e5e7eb;
  --color-code-bg: #f3f4f6;
  --color-header-bg: #ffffff;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  /* Layout */
  --max-width: 800px;
  --header-height: 70px;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-text: #e2e8f0;
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-secondary: #94a3b8;
    --color-border: #1e293b;
    --color-code-bg: #1e293b;
    --color-header-bg: #0f172a;
  }
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.site-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-header-bg);
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--spacing-sm);
  max-width: none;
  margin: 0;
}

.site-title {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

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

.site-nav a {
  margin-left: var(--spacing-md);
  color: var(--color-secondary);
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--color-primary);
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.75rem;
  margin-top: var(--spacing-lg);
}

h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-md);
}

p {
  margin-bottom: var(--spacing-sm);
}

/* Post List (Home) */
.post-list {
  list-style: none;
  margin-top: var(--spacing-lg);
}

.post-item {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

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

.post-meta {
  font-size: 0.875rem;
  color: var(--color-secondary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-xs);
  display: block;
}

.post-link {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.post-link:hover {
  color: var(--color-primary);
}

.post-excerpt {
  color: var(--color-secondary);
}

/* Post Content */
.post-header {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.post-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-xs);
}

.post-content {
  font-size: 1.125rem;
}

.post-content h2 {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-xs);
}

/* Heading Anchors */
.heading-anchor {
  position: absolute;
  left: -1em;
  top: 5px;
  opacity: 0;
  transition: opacity 0.2s ease;
  color: var(--color-secondary);
  text-decoration: none;
  font-size: 0.8em;
  line-height: 1;
}

.post-content h1:hover .heading-anchor,
.post-content h2:hover .heading-anchor,
.post-content h3:hover .heading-anchor,
.post-content h4:hover .heading-anchor,
.post-content h5:hover .heading-anchor,
.post-content h6:hover .heading-anchor {
  opacity: 1;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  position: relative;
  scroll-margin-top: 90px;
  /* Account for header height + padding */
}

/* Code Blocks */
pre,
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  background-color: var(--color-code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

pre {
  background-color: var(--color-code-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

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

blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin-left: 0;
  margin-bottom: var(--spacing-md);
  font-style: italic;
  color: var(--color-secondary);
}

/* Search */
.search-container {
  position: relative;
  display: inline-block;
  margin-left: var(--spacing-md);
}

#search-input {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  width: 200px;
  transition: border-color 0.2s, width 0.2s;
}

#search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  width: 250px;
}

.search-results {
  position: absolute;
  top: 100%;
  right: 0;
  width: 300px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  margin-top: 0.5rem;
  display: none;
  z-index: 50;
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  border-bottom: 1px solid var(--color-border);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--color-text);
  margin-left: 0;
}

.search-result-item a:hover {
  background-color: var(--color-code-bg);
}

.search-result-title {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.search-result-date {
  font-size: 0.75rem;
  color: var(--color-secondary);
}

.search-no-results {
  padding: 1rem;
  text-align: center;
  color: var(--color-secondary);
  font-size: 0.875rem;
}

/* Header Responsive Styles */
.site-title-short {
  display: none;
}

.search-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-secondary);
  padding: 0.5rem;
}

.search-toggle:hover {
  color: var(--color-primary);
}

@media (max-width: 600px) {
  .site-title-full {
    display: none;
  }

  .site-title-short {
    display: inline;
  }

  .search-toggle {
    display: block;
  }

  .search-container {
    position: static;
  }

  .search-input-wrapper {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: auto;
    padding: var(--spacing-sm);
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 20;
  }

  .search-container.active .search-input-wrapper {
    display: block;
  }

  #search-input {
    width: 100%;
  }

  #search-input:focus {
    width: 100%;
  }

  .search-results {
    width: 100%;
    position: static;
    margin-top: 0.5rem;
  }
}