/* ==========================================================================
   Developer-focused minimal theme
   Inspired by terminal aesthetics and IDE color schemes
   ========================================================================== */

:root {
  /* Dracula-inspired color palette */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-elevated: #21262d;
  --bg-hover: #30363d;
  
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-alt: #7ee787;
  --accent-warm: #ffa657;
  --accent-pink: #f778ba;
  
  --border: #30363d;
  --border-light: #21262d;
  
  --code-bg: #161b22;
  --code-text: #e6edf3;
  
  /* Typography */
  --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Layout */
  --max-width: 720px;
  --header-height: 60px;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle grid pattern background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-image: 
    linear-gradient(rgba(88, 166, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 166, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -1;
}

::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content {
  flex: 1;
  padding: var(--space-xl) 0;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-logo:hover {
  color: var(--accent);
}

.logo-text {
  color: var(--accent-alt);
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--border-light);
}

.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-md) 0;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin: 0;
  max-width: 600px;
  line-height: 1.6;
}

/* ==========================================================================
   Posts List
   ========================================================================== */

.posts {
  padding: var(--space-2xl) 0;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 var(--space-xl) 0;
}

.post-preview {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-light);
  transition: transform 0.2s ease;
}

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

.post-preview:hover {
  transform: translateX(4px);
}

.post-preview .post-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: var(--space-xs);
}

.post-preview .post-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs) 0;
}

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

.post-preview .post-title a:hover {
  color: var(--accent);
}

.post-preview .post-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  border: 1px solid rgba(88, 166, 255, 0.2);
}

/* ==========================================================================
   Single Post
   ========================================================================== */

.post-header {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--space-xl);
}

.post-header .post-date {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  display: block;
  margin-bottom: var(--space-md);
}

.post-header .post-title {
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-sm) 0;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.post-header .post-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin: 0;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* ==========================================================================
   Post Content
   ========================================================================== */

.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-md) 0;
  letter-spacing: -0.01em;
}

.post-content h1 { font-size: 1.75rem; }
.post-content h2 { 
  font-size: 1.5rem;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-light);
}
.post-content h3 { font-size: 1.25rem; }
.post-content h4 { font-size: 1.1rem; }

.post-content p {
  margin: 0 0 var(--space-lg) 0;
  color: var(--text-primary);
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(88, 166, 255, 0.4);
  transition: text-decoration-color 0.2s ease;
}

.post-content a:hover {
  text-decoration-color: var(--accent);
}

.post-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.post-content em {
  font-style: italic;
  color: var(--text-secondary);
}

/* Lists */
.post-content ul,
.post-content ol {
  margin: 0 0 var(--space-lg) 0;
  padding-left: var(--space-xl);
}

.post-content li {
  margin-bottom: var(--space-sm);
}

.post-content li::marker {
  color: var(--accent);
}

/* Blockquotes */
.post-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 3px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 0 8px 8px 0;
}

.post-content blockquote p {
  margin: 0;
  color: var(--text-secondary);
  font-style: italic;
}

.post-content blockquote strong {
  color: var(--accent);
}

/* Code */
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-secondary);
  color: var(--accent-warm);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.post-content pre {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--code-text);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Tables */
.post-content table {
  width: 100%;
  margin: var(--space-xl) 0;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border: 1px solid var(--border);
}

.post-content th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.post-content td {
  background: var(--bg-primary);
}

.post-content tr:hover td {
  background: var(--bg-secondary);
}

/* Images */
.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: var(--space-xl) 0;
  border: 1px solid var(--border);
}

/* Horizontal Rule */
.post-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: var(--space-2xl) 0;
}

/* ==========================================================================
   Post Footer
   ========================================================================== */

.post-footer {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-light);
}

.back-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ==========================================================================
   Page Styles
   ========================================================================== */

.page-header {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--space-xl);
}

.page-title {
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-sm) 0;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin: 0;
}

.page-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-md) 0;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-light);
}

.page-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent-warm);
  margin: var(--space-xl) 0 var(--space-sm) 0;
}

.page-content p {
  margin: 0 0 var(--space-lg) 0;
  color: var(--text-primary);
}

.page-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-content ul,
.page-content ol {
  margin: 0 0 var(--space-lg) 0;
  padding-left: var(--space-xl);
}

.page-content li {
  margin-bottom: var(--space-sm);
}

.page-content li::marker {
  color: var(--accent);
}

.page-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 3px solid var(--accent-pink);
  background: var(--bg-secondary);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-secondary);
}

.page-content table {
  width: 100%;
  margin: var(--space-xl) 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-content th,
.page-content td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border: 1px solid var(--border);
}

.page-content th {
  background: var(--bg-secondary);
  font-weight: 600;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-light);
  margin-top: auto;
}

.footer-content {
  text-align: center;
}

.footer-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0 0 var(--space-sm) 0;
}

.footer-name {
  color: var(--text-primary);
  font-weight: 500;
}

.footer-separator {
  color: var(--text-muted);
  margin: 0 var(--space-sm);
}

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

.footer-link:hover {
  text-decoration: underline;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin: var(--space-md) 0;
}

.footer-social {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-social:hover {
  color: var(--accent);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: var(--space-md) 0 0 0;
}

/* ==========================================================================
   404 Page
   ========================================================================== */

.error-page {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.error-code {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 15vw, 8rem);
  font-weight: 700;
  color: var(--accent);
  margin: 0;
  line-height: 1;
}

.error-title {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin: var(--space-lg) 0;
}

.error-message {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.error-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  text-decoration: none;
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--accent);
  border-radius: 6px;
  transition: all 0.2s ease;
}

.error-link:hover {
  background: var(--accent);
  color: var(--bg-primary);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 640px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 3rem;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .nav-links {
    gap: var(--space-md);
  }
  
  .nav-link {
    font-size: 0.8rem;
  }
  
  .hero {
    padding: var(--space-xl) 0;
  }
  
  .post-content pre {
    padding: var(--space-md);
    margin-left: calc(-1 * var(--space-md));
    margin-right: calc(-1 * var(--space-md));
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  
  .page-content table,
  .post-content table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* ==========================================================================
   Syntax Highlighting (GitHub Dark)
   ========================================================================== */

.highlight .c,
.highlight .c1,
.highlight .cm { color: #8b949e; } /* Comments */
.highlight .k,
.highlight .kd,
.highlight .kn { color: #ff7b72; } /* Keywords */
.highlight .s,
.highlight .s1,
.highlight .s2 { color: #a5d6ff; } /* Strings */
.highlight .n,
.highlight .na { color: #79c0ff; } /* Names/attributes */
.highlight .nf { color: #d2a8ff; } /* Functions */
.highlight .nc { color: #ffa657; } /* Classes */
.highlight .mi,
.highlight .mf { color: #79c0ff; } /* Numbers */
.highlight .o { color: #ff7b72; } /* Operators */
.highlight .p { color: #e6edf3; } /* Punctuation */