@import url('https://fonts.google.com/specimen/Inter');
    
    /* Reset & Base Styles */
    *, *::before, *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    /* Design System Variables (matching index.css) */
    :root {
      --background: 0 0% 100%;
      --foreground: 222 47% 11%;
      --card: 0 0% 100%;
      --card-foreground: 222 47% 11%;
      --popover: 0 0% 100%;
      --popover-foreground: 222 47% 11%;
      --primary: 243 75% 59%;
      --primary-foreground: 0 0% 100%;
      --secondary: 240 5% 96%;
      --secondary-foreground: 222 47% 11%;
      --muted: 240 5% 96%;
      --muted-foreground: 240 4% 46%;
      --accent: 262 83% 58%;
      --accent-foreground: 0 0% 100%;
      --destructive: 0 84% 60%;
      --destructive-foreground: 0 0% 100%;
      --border: 240 6% 90%;
      --input: 240 6% 90%;
      --ring: 243 75% 59%;
      --radius: 0.5rem;
      --success: 142 76% 36%;
      --success-foreground: 0 0% 100%;
      --warning: 38 92% 50%;
      --warning-foreground: 0 0% 100%;
      --info: 199 89% 48%;
      --info-foreground: 0 0% 100%;
      --shadow-sm: 0 1px 2px 0 hsl(240 6% 10% / 0.05);
      --shadow-md: 0 4px 6px -1px hsl(240 6% 10% / 0.1);
      --shadow-lg: 0 10px 15px -3px hsl(240 6% 10% / 0.1);
      --shadow-xl: 0 20px 25px -5px hsl(240 6% 10% / 0.1);
      
      /* Typography variables */
      --font-family: "Inter", sans-serif;
      --font-size-base: 1rem;
      --line-height: 1.5;
    }
    
    .dark {
      --background: 224 71% 4%;
      --foreground: 213 31% 91%;
      --card: 224 71% 4%;
      --card-foreground: 213 31% 91%;
      --popover: 224 71% 4%;
      --popover-foreground: 213 31% 91%;
      --primary: 243 75% 59%;
      --primary-foreground: 0 0% 100%;
      --secondary: 222 47% 11%;
      --secondary-foreground: 213 31% 91%;
      --muted: 222 47% 11%;
      --muted-foreground: 215 20% 65%;
      --accent: 262 83% 58%;
      --accent-foreground: 0 0% 100%;
      --destructive: 0 63% 31%;
      --destructive-foreground: 213 31% 91%;
      --border: 222 47% 11%;
      --input: 222 47% 11%;
      --ring: 243 75% 59%;
    }
    
    /* Theme Overrides */
    :root {
      --card: 0 0% 100%;
      --info: 199 89% 48%;
      --ring: 24 95% 53%;
      --input: 240 6% 90%;
      --muted: 240 5% 96%;
      --accent: 20 95% 60%;
      --border: 240 6% 90%;
      --radius: 0.5rem;
      --primary: 24 95% 53%;
      --success: 142 76% 36%;
      --warning: 38 92% 50%;
      --secondary: 240 5% 96%;
      --background: 33 100% 98%;
      --foreground: 20 14% 10%;
      --destructive: 0 84% 60%;
      --card-foreground: 222 47% 11%;
      --info-foreground: 0 0% 100%;
      --muted-foreground: 240 4% 46%;
      --accent-foreground: 0 0% 100%;
      --primary-foreground: 0 0% 100%;
      --success-foreground: 0 0% 100%;
      --warning-foreground: 0 0% 100%;
      --secondary-foreground: 222 47% 11%;
      --destructive-foreground: 0 0% 100%;
      --shadow-sm: 0 1px 2px 0 hsl(240 6% 10% / 0.05);
      --shadow-md: 0 4px 6px -1px hsl(240 6% 10% / 0.1);
      --shadow-lg: 0 10px 15px -3px hsl(240 6% 10% / 0.1);
      --shadow-xl: 0 20px 25px -5px hsl(240 6% 10% / 0.1);
    }
    
    html {
      font-size: 16px;
      -webkit-text-size-adjust: 100%;
    }
    
    body {
      font-family: var(--font-family);
      font-size: var(--font-size-base);
      line-height: var(--line-height);
      background-color: hsl(var(--background));
      color: hsl(var(--foreground));
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    /* Layout */
    .site-container {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    
    /* Container width utilities */
    .max-w-screen-sm { max-width: 640px; }
    .max-w-screen-md { max-width: 768px; }
    .max-w-screen-lg { max-width: 1024px; }
    .max-w-screen-xl { max-width: 1280px; }
    .max-w-screen-2xl { max-width: 1536px; }
    .max-w-full { max-width: 100%; }
    
    /* Padding utilities */
    .px-0 { padding-left: 0; padding-right: 0; }
    .px-4 { padding-left: 1rem; padding-right: 1rem; }
    .px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
    .px-8 { padding-left: 2rem; padding-right: 2rem; }
    .px-12 { padding-left: 3rem; padding-right: 3rem; }
    
    .py-0 { padding-top: 0; padding-bottom: 0; }
    .py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
    .py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
    .py-4 { padding-top: 1rem; padding-bottom: 1rem; }
    .py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
    .py-8 { padding-top: 2rem; padding-bottom: 2rem; }
    .py-10 { padding-top: 2.5rem; padding-bottom: 2.5rem; }
    .py-12 { padding-top: 3rem; padding-bottom: 3rem; }
    
    .pt-4 { padding-top: 1rem; }
    .pb-8 { padding-bottom: 2rem; }
    
    .container {
      width: 100%;
      margin: 0 auto;
    }
    
    .mx-auto {
      margin-left: auto;
      margin-right: auto;
    }
    
    /* Header */
    header {
      border-bottom: 1px solid hsl(var(--border));
      background: hsl(var(--background));
      position: sticky;
      top: 0;
      z-index: 10;
      box-shadow: var(--shadow-sm);
    }
    
    header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1rem;
    }
    
    .header-logo {
      display: flex;
      align-items: center;
    }
    
    .header-logo img {
      height: 3rem;
      object-fit: contain;
    }
    
    .site-title {
      font-size: 1.5rem;
      font-weight: 700;
      color: hsl(var(--primary));
      text-decoration: none;
      margin: 0;
    }
    
    @media (min-width: 768px) {
      .site-title {
        font-size: 1.875rem;
      }
    }
    
    /* Navigation */
    nav {
      position: relative;
    }
    
    nav ul {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem 1.5rem;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    
    nav.footer-nav ul {
      flex-direction: row;
      justify-content: center;
      font-size: 0.875rem;
    }
    
    nav li {
      position: relative;
      margin: 0;
    }
    
    nav a {
      color: hsl(var(--foreground));
      text-decoration: none;
      font-weight: 500;
      padding: 0.5rem 0.75rem;
      display: block;
      border-bottom: 2px solid transparent;
      transition: all 0.2s ease;
    }
    
    nav a:hover {
      color: hsl(var(--primary));
      border-bottom-color: hsl(var(--primary));
    }
    
    nav.footer-nav a {
      border-bottom: none;
      padding: 0.25rem 0.5rem;
    }
    
    nav.footer-nav a:hover {
      opacity: 0.7;
    }
    
    /* Dropdown Styles */
    nav ul ul {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      background: hsl(var(--background));
      border: 1px solid hsl(var(--border));
      border-radius: 0.375rem;
      box-shadow: var(--shadow-lg);
      min-width: 200px;
      z-index: 1000;
      flex-direction: column;
      gap: 0;
      margin-top: 0.25rem;
    }
    
    nav ul ul li {
      width: 100%;
    }
    
    nav ul ul a {
      padding: 0.75rem 1rem;
      border-bottom: none;
    }
    
    nav ul ul a:hover {
      background: hsl(var(--muted));
    }
    
    nav li.has-children > a::after {
      content: ' ▾';
      font-size: 0.75rem;
      margin-left: 0.25rem;
    }
    
    nav li.has-children.open > ul {
      display: flex;
    }
    
    /* Breadcrumbs */
    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
      font-size: 0.875rem;
      color: hsl(var(--muted-foreground));
    }
    
    .breadcrumb a {
      color: hsl(var(--muted-foreground));
      text-decoration: none;
      transition: color 0.2s;
    }
    
    .breadcrumb a:hover {
      color: hsl(var(--primary));
    }
    
    .breadcrumb-separator {
      display: inline-flex;
      align-items: center;
    }
    
    .breadcrumb-current {
      color: hsl(var(--foreground));
      font-weight: 500;
    }
    
    /* Main Content */
    main {
      flex: 1;
    }
    
    /* Section gaps */
    .space-y-0 > * + * { margin-top: 0; }
    .space-y-4 > * + * { margin-top: 1rem; }
    .space-y-6 > * + * { margin-top: 1.5rem; }
    .space-y-8 > * + * { margin-top: 2rem; }
    .space-y-12 > * + * { margin-top: 3rem; }
    .space-y-16 > * + * { margin-top: 4rem; }
    
    /* Typography */
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
      color: hsl(var(--foreground));
    }
    
    h1 {
      font-size: 2.5em;
      margin-bottom: 2rem;
    }
    
    h2 {
      font-size: 2em;
      margin-top: 2rem;
    }
    
    h3 {
      font-size: 1.5em;
      margin-top: 1.5rem;
    }
    
    p {
      margin-bottom: 1rem;
      line-height: var(--line-height);
    }
    
    a {
      color: hsl(var(--primary));
      text-decoration: none;
      transition: opacity 0.2s ease;
    }
    
    a:hover {
      opacity: 0.8;
    }
    
    /* Lists */
    ul, ol {
      margin: 1rem 0;
      padding-left: 1.5rem;
    }
    
    li {
      margin-bottom: 0.5rem;
    }
    
    /* Prose/Rich Text */
    .prose {
      max-width: 65ch;
      line-height: var(--line-height);
    }
    
    .prose img {
      margin: 1.5rem 0;
      border-radius: var(--radius);
      max-width: 100%;
      height: auto;
    }
    
    .prose p {
      color: hsl(var(--foreground));
    }
    
    .prose a {
      color: hsl(var(--primary));
    }
    
    .prose strong {
      font-weight: 700;
      color: hsl(var(--foreground));
    }
    
    .prose ul {
      list-style-type: disc;
    }
    
    .prose ol {
      list-style-type: decimal;
    }
    
    .prose li {
      margin-left: 1rem;
      color: hsl(var(--foreground));
    }
    
    .prose h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-top: 2rem;
      margin-bottom: 1rem;
    }
    
    .prose h4 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-top: 1.5rem;
      margin-bottom: 0.75rem;
    }
    
    /* Code */
    code {
      background: hsl(var(--muted));
      padding: 0.125rem 0.375rem;
      border-radius: 0.25rem;
      font-size: 0.875em;
      font-family: 'Monaco', 'Courier New', monospace;
    }
    
    pre {
      background: hsl(222 47% 11%);
      color: hsl(213 31% 91%);
      padding: 1rem;
      border-radius: var(--radius);
      overflow-x: auto;
      margin: 1rem 0;
    }
    
    pre code {
      background: none;
      padding: 0;
      color: inherit;
    }
    
    /* Blockquotes */
    blockquote {
      border-left: 4px solid hsl(var(--primary));
      padding-left: 1rem;
      margin: 1.5rem 0;
      color: hsl(var(--muted-foreground));
      font-style: italic;
    }
    
    /* Images */
    img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius);
    }
    
    /* Tables */
    table {
      width: 100%;
      border-collapse: collapse;
      margin: 1.5rem 0;
    }
    
    th, td {
      padding: 0.75rem;
      text-align: left;
      border-bottom: 1px solid hsl(var(--border));
    }
    
    th {
      font-weight: 600;
      background: hsl(var(--muted));
    }
    
    /* Footer */
    footer {
      margin-top: auto;
      border-top: 1px solid hsl(var(--border));
    }
    
    footer .container {
      text-align: center;
    }
    
    footer p {
      color: hsl(var(--muted-foreground));
      margin: 0.5rem 0;
      font-size: 0.875rem;
    }
    
    footer a {
      color: hsl(var(--muted-foreground));
    }
    
    footer a:hover {
      color: hsl(var(--primary));
    }
    
    .footer-tagline {
      font-size: 1rem;
      font-weight: 500;
      margin-bottom: 0.5rem;
    }
    
    /* Utility classes */
    .rounded-lg { border-radius: var(--radius); }
    .shadow-md { box-shadow: var(--shadow-md); }
    .shadow-lg { box-shadow: var(--shadow-lg); }
    .border { border: 1px solid hsl(var(--border)); }
    .mb-2 { margin-bottom: 0.5rem; }
    .mb-4 { margin-bottom: 1rem; }
    .mb-8 { margin-bottom: 2rem; }
    .mt-2 { margin-top: 0.5rem; }
    .mt-4 { margin-top: 1rem; }
    
    /* ========================================
       MOBILE-FIRST RESPONSIVE UTILITIES
       ======================================== */
    
    /* Display utilities */
    .hidden { display: none; }
    .block { display: block; }
    .inline-block { display: inline-block; }
    .flex { display: flex; }
    .inline-flex { display: inline-flex; }
    .grid { display: grid; }
    
    /* Flexbox utilities */
    .flex-row { flex-direction: row; }
    .flex-col { flex-direction: column; }
    .flex-wrap { flex-wrap: wrap; }
    .items-center { align-items: center; }
    .items-start { align-items: flex-start; }
    .justify-center { justify-content: center; }
    .justify-between { justify-content: space-between; }
    .gap-1 { gap: 0.25rem; }
    .gap-2 { gap: 0.5rem; }
    .gap-3 { gap: 0.75rem; }
    .gap-4 { gap: 1rem; }
    .gap-6 { gap: 1.5rem; }
    .gap-8 { gap: 2rem; }
    
    /* Grid utilities */
    .grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
    .grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    
    /* Width utilities */
    .w-full { width: 100%; }
    .w-auto { width: auto; }
    
    /* Margin utilities */
    .m-0 { margin: 0; }
    .m-auto { margin: auto; }
    .mb-1 { margin-bottom: 0.25rem; }
    .mb-3 { margin-bottom: 0.75rem; }
    .mb-6 { margin-bottom: 1.5rem; }
    .mt-6 { margin-top: 1.5rem; }
    .mt-8 { margin-top: 2rem; }
    
    /* Text utilities */
    .text-xs { font-size: 0.75rem; }
    .text-sm { font-size: 0.875rem; }
    .text-base { font-size: 1rem; }
    .text-lg { font-size: 1.125rem; }
    .text-xl { font-size: 1.25rem; }
    .text-2xl { font-size: 1.5rem; }
    .text-3xl { font-size: 1.875rem; }
    .text-center { text-align: center; }
    .font-semibold { font-weight: 600; }
    
    /* Mobile Navigation Hamburger Menu */
    .mobile-menu-toggle {
      display: none;
      position: fixed;
      top: 1rem;
      right: 1rem;
      z-index: 1000;
      width: 44px;
      height: 44px;
      background: hsl(var(--primary));
      border: none;
      border-radius: 0.375rem;
      cursor: pointer;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 0.25rem;
      box-shadow: var(--shadow-lg);
    }
    
    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: hsl(var(--primary-foreground));
      transition: all 0.3s ease;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
      opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
      transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: hsl(var(--background));
      z-index: 999;
      overflow-y: auto;
      padding: 5rem 2rem 2rem;
    }
    
    .mobile-menu.active {
      display: block;
    }
    
    .mobile-menu ul {
      flex-direction: column;
      gap: 0;
    }
    
    .mobile-menu li {
      width: 100%;
      border-bottom: 1px solid hsl(var(--border));
    }
    
    .mobile-menu a {
      display: block;
      padding: 1rem;
      font-size: 1.125rem;
    }
    
    .mobile-menu li.has-children > ul {
      position: static;
      border: none;
      box-shadow: none;
      background: hsl(var(--muted) / 0.3);
      margin: 0;
      padding-left: 1rem;
    }
    
    /* Responsive Breakpoints */
    @media (max-width: 640px) {
      /* Mobile styles (< 640px) */
      html {
        font-size: 14px;
      }
      
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      
      h1 {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
        line-height: 1.1;
      }
      
      h2 {
        font-size: clamp(1.5rem, 6vw, 2rem);
      }
      
      h3 {
        font-size: clamp(1.25rem, 5vw, 1.5rem);
      }
      
      .mobile-menu-toggle {
        display: flex;
      }
      
      header nav:not(.footer-nav) {
        display: none;
      }
      
      header .container {
        flex-direction: row;
        justify-content: space-between;
      }
      
      .site-title {
        font-size: 1.25rem;
      }
      
      .header-logo img {
        height: 2.5rem;
      }
      
      /* Stack buttons vertically on mobile */
      section [style*="display: flex"] {
        flex-direction: column;
      }
      
      /* Adjust grid layouts for mobile */
      [style*="grid-template-columns"] {
        grid-template-columns: 1fr !important;
      }
      
      /* Improve touch targets */
      a, button {
        min-height: 44px;
        min-width: 44px;
      }
      
      /* Reduce padding on mobile */
      .py-20 {
        padding-top: 3rem !important;
        padding-bottom: 3rem !important;
      }
      
      .py-12 {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
      }
      
      .px-12 {
        padding-left: 1rem !important;
        padding-right: 1rem !important;
      }
    }
    
    @media (min-width: 641px) and (max-width: 768px) {
      /* Tablet portrait styles (641px - 768px) */
      html {
        font-size: 15px;
      }
      
      .mobile-menu-toggle {
        display: flex;
      }
      
      header nav {
        display: none;
      }
      
      [style*="grid-template-columns: repeat(auto-fit"] {
        grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
      }
    }
    
    @media (min-width: 769px) and (max-width: 1024px) {
      /* Tablet landscape styles (769px - 1024px) */
      .container {
        max-width: 90%;
      }
    }
    
    @media (min-width: 1025px) {
      /* Desktop styles (> 1024px) */
      nav ul {
        display: flex;
        flex-direction: row;
      }
      
      nav ul ul {
        position: absolute;
        top: 100%;
        left: 0;
        background: hsl(var(--background));
        border: 1px solid hsl(var(--border));
        border-radius: 0.375rem;
        box-shadow: var(--shadow-lg);
        min-width: 200px;
      }
      
      nav li.has-children:hover > ul {
        display: flex;
      }
    }
    
    /* Image responsiveness */
    img {
      max-width: 100%;
      height: auto;
    }
    
    /* Responsive embed containers */
    .aspect-video {
      aspect-ratio: 16 / 9;
    }
    
    .aspect-square {
      aspect-ratio: 1 / 1;
    }
    
    /* Fluid typography using clamp */
    .fluid-text-sm {
      font-size: clamp(0.875rem, 0.8rem + 0.5vw, 1rem);
    }
    
    .fluid-text-base {
      font-size: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    }
    
    .fluid-text-lg {
      font-size: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
    }
    
    .fluid-text-xl {
      font-size: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    }
    
    .fluid-text-2xl {
      font-size: clamp(1.5rem, 1.3rem + 1vw, 1.875rem);
    }
    
    .fluid-text-3xl {
      font-size: clamp(1.875rem, 1.5rem + 1.875vw, 2.25rem);
    }
    
    .fluid-text-4xl {
      font-size: clamp(2.25rem, 1.75rem + 2.5vw, 3rem);
    }