/* Modern Design System */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  /* Color Palette */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-900: #0c4a6e;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  --accent-orange: #f59e0b;
  --accent-orange-hover: #d97706;
  --accent-green: #10b981;
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Theme Variables */
  --bg-primary: var(--gray-50);
  --bg-secondary: #ffffff;
  --bg-tertiary: var(--gray-100);
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-muted: var(--gray-500);
  --border-color: var(--gray-200);
  --border-hover: var(--gray-300);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, monospace;

  /* Spacing */
  --max-width: 1200px;
  --header-height: 80px;

  /* Animations */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: var(--gray-900);
  --bg-secondary: var(--gray-800);
  --bg-tertiary: var(--gray-700);
  --text-primary: var(--gray-50);
  --text-secondary: var(--gray-300);
  --text-muted: var(--gray-400);
  --border-color: var(--gray-700);
  --border-hover: var(--gray-600);
}

/* Performance optimizations */
* {
  /* Improve scrolling performance */
  -webkit-overflow-scrolling: touch;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: var(--gray-900);
    --text-muted: var(--gray-800);
  }

  [data-theme="dark"] {
    --border-color: var(--gray-100);
    --text-muted: var(--gray-200);
  }
}

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

html {
  font-family: var(--font-sans);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: 3rem;
}
h2 {
  font-size: 2.25rem;
}
h3 {
  font-size: 1.875rem;
}
h4 {
  font-size: 1.5rem;
}
h5 {
  font-size: 1.25rem;
}
h6 {
  font-size: 1.125rem;
}

p {
  margin: 0 0 1rem 0;
  color: var(--text-secondary);
}

a {
  color: var(--primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-700);
}

header {
  background-color: var(--header-bg);
  margin: 0 -2rem 3rem -2rem;
  padding: 2rem;
  text-align: center;
  border-bottom: 2px solid var(--card-border);
}

header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 2.5rem;
  font-weight: 600;
}

header h1 a {
  color: var(--text-color);
  text-decoration: none;
}

header h1 a:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.post-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.post-item {
  padding: 2rem;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--card-border);
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.post-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
  border-color: var(--accent-color);
}

.post-link {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-color);
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
}

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

.post-date {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.post-content {
  line-height: 1.7;
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.tagline {
  color: var(--text-muted);
  margin: 0;
  font-size: 1.1rem;
  font-weight: 400;
}

/* Article Content Styling */
.article-content {
  max-width: 65ch;
  margin: 0 auto;
  line-height: 1.8;
}

.article-content h2 {
  margin: 2rem 0 1rem 0;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.article-content h3 {
  margin: 1.5rem 0 0.75rem 0;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content pre {
  background-color: var(--bg-tertiary);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  margin: 1.5rem 0;
  border: 1px solid var(--border-color);
}

.article-content code {
  font-family: var(--font-mono);
  background-color: var(--bg-tertiary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  border: 1px solid var(--border-color);
}

.article-content pre code {
  background: none;
  padding: 0;
  border: none;
}

.article-content blockquote {
  border-left: 4px solid var(--primary-600);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-secondary);
}

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

.article-content a {
  color: var(--primary-600);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--transition-fast);
}

.article-content a:hover {
  text-decoration-color: var(--primary-600);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background-color: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] .header {
  background-color: rgba(31, 41, 55, 0.8);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.logo:hover {
  color: var(--primary-600);
}

.nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-600);
}

/* Main Content */
main {
  min-height: calc(100vh - var(--header-height));
  padding: 3rem 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 0 6rem 0;
  background: linear-gradient(
    135deg,
    var(--primary-50) 0%,
    var(--bg-secondary) 100%
  );
  margin-bottom: 4rem;
}

[data-theme="dark"] .hero {
  background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
}

.hero h1 {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-weight: 700;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--primary-600);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  font-weight: 500;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.hero-cta:hover {
  background-color: var(--primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  color: white;
}

/* Blog Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.blog-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.blog-card-content {
  padding: 1.5rem;
}

.blog-card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.blog-card-title a {
  color: inherit;
  text-decoration: none;
}

.blog-card-title a:hover {
  color: var(--primary-600);
}

.blog-card-excerpt {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.blog-card-date {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  margin-top: 4rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  color: var(--text-muted);
}

.footer-left p {
  margin: 0;
  font-size: 0.9rem;
}

.social-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.2s ease;
  background-color: transparent;
}

.social-link:hover {
  color: var(--primary-600);
  background-color: var(--primary-50);
  transform: translateY(-2px);
}

[data-theme="dark"] .social-link:hover {
  background-color: var(--primary-900);
  color: var(--primary-400);
}

/* Focus states for accessibility */
a:focus,
button:focus {
  outline: 2px solid var(--primary-600);
  outline-offset: 2px;
}

.blog-card:focus-within {
  outline: 2px solid var(--primary-600);
  outline-offset: 2px;
}

/* Skip link for screen readers */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-600);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 100;
}

.skip-link:focus {
  top: 6px;
}

/* Print styles */
@media print {
  .header,
  .footer,
  .hero-cta {
    display: none;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .article-content {
    max-width: none;
  }

  .blog-card {
    break-inside: avoid;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .header-content {
    padding: 0 1rem;
  }

  .nav {
    gap: 1rem;
  }

  .hero {
    padding: 2rem 0 3rem 0;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .blog-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer-left p {
    font-size: 0.8rem;
  }

  .social-links {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .article-content {
    max-width: 100%;
  }

  .article-content pre {
    margin-left: -1rem;
    margin-right: -1rem;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}