:root {
    /* Primitive Color Tokens */
    --color-white: rgba(255, 255, 255, 1);
    --color-black: rgba(0, 0, 0, 1);
    --color-cream-50: rgba(252, 252, 249, 1);
    --color-cream-100: rgba(255, 255, 253, 1);
    --color-gray-200: rgba(245, 245, 245, 1);
    --color-gray-300: rgba(167, 169, 169, 1);
    --color-gray-400: rgba(119, 124, 124, 1);
    --color-slate-500: rgba(98, 108, 113, 1);
    --color-brown-600: rgba(94, 82, 64, 1);
    --color-charcoal-700: rgba(31, 33, 33, 1);
    --color-charcoal-800: rgba(38, 40, 40, 1);
    --color-slate-900: rgba(19, 52, 59, 1);
    --color-teal-300: rgba(50, 184, 198, 1);
    --color-teal-400: rgba(45, 166, 178, 1);
    --color-teal-500: rgba(33, 128, 141, 1);
    --color-teal-600: rgba(29, 116, 128, 1);
    --color-teal-700: rgba(26, 104, 115, 1);
    --color-teal-800: rgba(41, 150, 161, 1);
    --color-red-400: rgba(255, 84, 89, 1);
    --color-red-500: rgba(192, 21, 47, 1);
    --color-orange-400: rgba(230, 129, 97, 1);
    --color-orange-500: rgba(168, 75, 47, 1);
  
    /* RGB versions for opacity control */
    --color-brown-600-rgb: 94, 82, 64;
    --color-teal-500-rgb: 33, 128, 141;
    --color-slate-900-rgb: 19, 52, 59;
    --color-slate-500-rgb: 98, 108, 113;
    --color-red-500-rgb: 192, 21, 47;
    --color-red-400-rgb: 255, 84, 89;
    --color-orange-500-rgb: 168, 75, 47;
    --color-orange-400-rgb: 230, 129, 97;
  
    /* Background color tokens (Light Mode) */
    --color-bg-1: rgba(59, 130, 246, 0.08); /* Light blue */
    --color-bg-2: rgba(245, 158, 11, 0.08); /* Light yellow */
    --color-bg-3: rgba(34, 197, 94, 0.08); /* Light green */
    --color-bg-4: rgba(239, 68, 68, 0.08); /* Light red */
    --color-bg-5: rgba(147, 51, 234, 0.08); /* Light purple */
    --color-bg-6: rgba(249, 115, 22, 0.08); /* Light orange */
    --color-bg-7: rgba(236, 72, 153, 0.08); /* Light pink */
    --color-bg-8: rgba(6, 182, 212, 0.08); /* Light cyan */
  
    /* Semantic Color Tokens (Light Mode) */
    --color-background: var(--color-cream-50);
    --color-surface: var(--color-cream-100);
    --color-text: var(--color-slate-900);
    --color-text-secondary: var(--color-slate-500);
    --color-primary: var(--color-teal-500);
    --color-primary-hover: var(--color-teal-600);
    --color-primary-active: var(--color-teal-700);
    --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
    --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
    --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
    --color-border: rgba(var(--color-brown-600-rgb), 0.2);
    --color-btn-primary-text: var(--color-cream-50);
    --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
    --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
    --color-error: var(--color-red-500);
    --color-success: var(--color-teal-500);
    --color-warning: var(--color-orange-500);
    --color-info: var(--color-slate-500);
    --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
    --color-select-caret: rgba(var(--color-slate-900-rgb), 0.8);
  
    /* Common style patterns */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  
    /* RGB versions for opacity control */
    --color-success-rgb: 33, 128, 141;
    --color-error-rgb: 192, 21, 47;
    --color-warning-rgb: 168, 75, 47;
    --color-info-rgb: 98, 108, 113;
  
    /* Typography */
    --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
      BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
      Monaco, Consolas, monospace;
    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 20px;
    --font-size-3xl: 24px;
    --font-size-4xl: 30px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 550;
    --font-weight-bold: 600;
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --letter-spacing-tight: -0.01em;
  
    /* Spacing */
    --space-0: 0;
    --space-1: 1px;
    --space-2: 2px;
    --space-4: 4px;
    --space-6: 6px;
    --space-8: 8px;
    --space-10: 10px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;
  
    /* Border Radius */
    --radius-sm: 6px;
    --radius-base: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-full: 9999px;
  
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
      0 2px 4px -1px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
      0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(0, 0, 0, 0.03);
  
    /* Animation */
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
  
    /* Layout */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
  }
  
  /* Dark mode colors */
  @media (prefers-color-scheme: dark) {
    :root {
      /* RGB versions for opacity control (Dark Mode) */
      --color-gray-400-rgb: 119, 124, 124;
      --color-teal-300-rgb: 50, 184, 198;
      --color-gray-300-rgb: 167, 169, 169;
      --color-gray-200-rgb: 245, 245, 245;
  
      /* Background color tokens (Dark Mode) */
      --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
      --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
      --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
      --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
      --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
      --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
      --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
      --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
      
      /* Semantic Color Tokens (Dark Mode) */
      --color-background: var(--color-charcoal-700);
      --color-surface: var(--color-charcoal-800);
      --color-text: var(--color-gray-200);
      --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
      --color-primary: var(--color-teal-300);
      --color-primary-hover: var(--color-teal-400);
      --color-primary-active: var(--color-teal-800);
      --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
      --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
      --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
      --color-border: rgba(var(--color-gray-400-rgb), 0.3);
      --color-error: var(--color-red-400);
      --color-success: var(--color-teal-300);
      --color-warning: var(--color-orange-400);
      --color-info: var(--color-gray-300);
      --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
      --color-btn-primary-text: var(--color-slate-900);
      --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
      --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
      --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
        inset 0 -1px 0 rgba(0, 0, 0, 0.15);
      --button-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
      --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
      --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);
  
      /* Common style patterns - updated for dark mode */
      --focus-ring: 0 0 0 3px var(--color-focus-ring);
      --focus-outline: 2px solid var(--color-primary);
      --status-bg-opacity: 0.15;
      --status-border-opacity: 0.25;
      --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
      --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  
      /* RGB versions for dark mode */
      --color-success-rgb: var(--color-teal-300-rgb);
      --color-error-rgb: var(--color-red-400-rgb);
      --color-warning-rgb: var(--color-orange-400-rgb);
      --color-info-rgb: var(--color-gray-300-rgb);
    }
  }
  
  /* Data attribute for manual theme switching */
  [data-color-scheme="dark"] {
    /* RGB versions for opacity control (dark mode) */
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;
  
    /* Colorful background palette - Dark Mode */
    --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
    --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
    --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
    --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
    --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
    --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
    --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
    --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
    
    /* Semantic Color Tokens (Dark Mode) */
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.15);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);
  
    /* Common style patterns - updated for dark mode */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  
    /* RGB versions for dark mode */
    --color-success-rgb: var(--color-teal-300-rgb);
    --color-error-rgb: var(--color-red-400-rgb);
    --color-warning-rgb: var(--color-orange-400-rgb);
    --color-info-rgb: var(--color-gray-300-rgb);
  }
  
  [data-color-scheme="light"] {
    /* RGB versions for opacity control (light mode) */
    --color-brown-600-rgb: 94, 82, 64;
    --color-teal-500-rgb: 33, 128, 141;
    --color-slate-900-rgb: 19, 52, 59;
    
    /* Semantic Color Tokens (Light Mode) */
    --color-background: var(--color-cream-50);
    --color-surface: var(--color-cream-100);
    --color-text: var(--color-slate-900);
    --color-text-secondary: var(--color-slate-500);
    --color-primary: var(--color-teal-500);
    --color-primary-hover: var(--color-teal-600);
    --color-primary-active: var(--color-teal-700);
    --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
    --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
    --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
    --color-border: rgba(var(--color-brown-600-rgb), 0.2);
    --color-btn-primary-text: var(--color-cream-50);
    --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
    --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
    --color-error: var(--color-red-500);
    --color-success: var(--color-teal-500);
    --color-warning: var(--color-orange-500);
    --color-info: var(--color-slate-500);
    --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
  
    /* RGB versions for light mode */
    --color-success-rgb: var(--color-teal-500-rgb);
    --color-error-rgb: var(--color-red-500-rgb);
    --color-warning-rgb: var(--color-orange-500-rgb);
    --color-info-rgb: var(--color-slate-500-rgb);
  }
  
  /* Base styles */
  html {
    font-size: var(--font-size-base);
    font-family: var(--font-family-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    padding: 0;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: inherit;
  }
  
  /* Typography */
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    margin: 0;
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
    letter-spacing: var(--letter-spacing-tight);
  }
  
  h1 {
    font-size: var(--font-size-4xl);
  }
  h2 {
    font-size: var(--font-size-3xl);
  }
  h3 {
    font-size: var(--font-size-2xl);
  }
  h4 {
    font-size: var(--font-size-xl);
  }
  h5 {
    font-size: var(--font-size-lg);
  }
  h6 {
    font-size: var(--font-size-md);
  }
  
  p {
    margin: 0 0 var(--space-16) 0;
  }
  
  a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-standard);
  }
  
  a:hover {
    color: var(--color-primary-hover);
  }
  
  code,
  pre {
    font-family: var(--font-family-mono);
    font-size: calc(var(--font-size-base) * 0.95);
    background-color: var(--color-secondary);
    border-radius: var(--radius-sm);
  }
  
  code {
    padding: var(--space-1) var(--space-4);
  }
  
  pre {
    padding: var(--space-16);
    margin: var(--space-16) 0;
    overflow: auto;
    border: 1px solid var(--color-border);
  }
  
  pre code {
    background: none;
    padding: 0;
  }
  
  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--space-16);
    border-radius: var(--radius-base);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-standard);
    border: none;
    text-decoration: none;
    position: relative;
  }
  
  .btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
  }
  
  .btn--primary {
    background: var(--color-primary);
    color: var(--color-btn-primary-text);
  }
  
  .btn--primary:hover {
    background: var(--color-primary-hover);
  }
  
  .btn--primary:active {
    background: var(--color-primary-active);
  }
  
  .btn--secondary {
    background: var(--color-secondary);
    color: var(--color-text);
  }
  
  .btn--secondary:hover {
    background: var(--color-secondary-hover);
  }
  
  .btn--secondary:active {
    background: var(--color-secondary-active);
  }
  
  .btn--outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
  }
  
  .btn--outline:hover {
    background: var(--color-secondary);
  }
  
  .btn--sm {
    padding: var(--space-4) var(--space-12);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
  }
  
  .btn--lg {
    padding: var(--space-10) var(--space-20);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-md);
  }
  
  .btn--full-width {
    width: 100%;
  }
  
  .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
  
  /* Form elements */
  .form-control {
    display: block;
    width: 100%;
    padding: var(--space-8) var(--space-12);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    transition: border-color var(--duration-fast) var(--ease-standard),
      box-shadow var(--duration-fast) var(--ease-standard);
  }
  
  textarea.form-control {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
  }
  
  select.form-control {
    padding: var(--space-8) var(--space-12);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: var(--select-caret-light);
    background-repeat: no-repeat;
    background-position: right var(--space-12) center;
    background-size: 16px;
    padding-right: var(--space-32);
  }
  
  /* Add a dark mode specific caret */
  @media (prefers-color-scheme: dark) {
    select.form-control {
      background-image: var(--select-caret-dark);
    }
  }
  
  /* Also handle data-color-scheme */
  [data-color-scheme="dark"] select.form-control {
    background-image: var(--select-caret-dark);
  }
  
  [data-color-scheme="light"] select.form-control {
    background-image: var(--select-caret-light);
  }
  
  .form-control:focus {
    border-color: var(--color-primary);
    outline: var(--focus-outline);
  }
  
  .form-label {
    display: block;
    margin-bottom: var(--space-8);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
  }
  
  .form-group {
    margin-bottom: var(--space-16);
  }
  
  /* Card component */
  .card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--duration-normal) var(--ease-standard);
  }
  
  .card:hover {
    box-shadow: var(--shadow-md);
  }
  
  .card__body {
    padding: var(--space-16);
  }
  
  .card__header,
  .card__footer {
    padding: var(--space-16);
    border-bottom: 1px solid var(--color-card-border-inner);
  }
  
  /* Status indicators - simplified with CSS variables */
  .status {
    display: inline-flex;
    align-items: center;
    padding: var(--space-6) var(--space-12);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
  }
  
  .status--success {
    background-color: rgba(
      var(--color-success-rgb, 33, 128, 141),
      var(--status-bg-opacity)
    );
    color: var(--color-success);
    border: 1px solid
      rgba(var(--color-success-rgb, 33, 128, 141), var(--status-border-opacity));
  }
  
  .status--error {
    background-color: rgba(
      var(--color-error-rgb, 192, 21, 47),
      var(--status-bg-opacity)
    );
    color: var(--color-error);
    border: 1px solid
      rgba(var(--color-error-rgb, 192, 21, 47), var(--status-border-opacity));
  }
  
  .status--warning {
    background-color: rgba(
      var(--color-warning-rgb, 168, 75, 47),
      var(--status-bg-opacity)
    );
    color: var(--color-warning);
    border: 1px solid
      rgba(var(--color-warning-rgb, 168, 75, 47), var(--status-border-opacity));
  }
  
  .status--info {
    background-color: rgba(
      var(--color-info-rgb, 98, 108, 113),
      var(--status-bg-opacity)
    );
    color: var(--color-info);
    border: 1px solid
      rgba(var(--color-info-rgb, 98, 108, 113), var(--status-border-opacity));
  }
  
  /* Container layout */
  .container {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
    padding-right: var(--space-16);
    padding-left: var(--space-16);
  }
  
  @media (min-width: 640px) {
    .container {
      max-width: var(--container-sm);
    }
  }
  @media (min-width: 768px) {
    .container {
      max-width: var(--container-md);
    }
  }
  @media (min-width: 1024px) {
    .container {
      max-width: var(--container-lg);
    }
  }
  @media (min-width: 1280px) {
    .container {
      max-width: var(--container-xl);
    }
  }
  
  /* Utility classes */
  .flex {
    display: flex;
  }
  .flex-col {
    flex-direction: column;
  }
  .items-center {
    align-items: center;
  }
  .justify-center {
    justify-content: center;
  }
  .justify-between {
    justify-content: space-between;
  }
  .gap-4 {
    gap: var(--space-4);
  }
  .gap-8 {
    gap: var(--space-8);
  }
  .gap-16 {
    gap: var(--space-16);
  }
  
  .m-0 {
    margin: 0;
  }
  .mt-8 {
    margin-top: var(--space-8);
  }
  .mb-8 {
    margin-bottom: var(--space-8);
  }
  .mx-8 {
    margin-left: var(--space-8);
    margin-right: var(--space-8);
  }
  .my-8 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-8);
  }
  
  .p-0 {
    padding: 0;
  }
  .py-8 {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }
  .px-8 {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
  .py-16 {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
  .px-16 {
    padding-left: var(--space-16);
    padding-right: var(--space-16);
  }
  
  .block {
    display: block;
  }
  .hidden {
    display: none;
  }
  
  /* Accessibility */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }
  
  :focus-visible {
    outline: var(--focus-outline);
    outline-offset: 2px;
  }
  
  /* Dark mode specifics */
  [data-color-scheme="dark"] .btn--outline {
    border: 1px solid var(--color-border-secondary);
  }
  
  @font-face {
    font-family: 'FKGroteskNeue';
    src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
      format('woff2');
  }
  
  /* END PERPLEXITY DESIGN SYSTEM */
  /* Custom CSS for VulnTech Course Page */
  
  /* Override design system for dark theme */
  :root {
    --primary-green: #D1FF52;
    --light-blue: #87CEEB;
    --dark-bg: #000000;
    --dark-surface: #111111;
    --dark-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --border-dark: #333333;
    --glow-green: 0 0 20px rgba(209, 255, 82, 0.3);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Inter', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  h1, h2, h3, h4, h5, h6 {
    font-family: 'Source Code Pro', monospace;
    font-weight: 600;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  /* Header */
  .header {
    background-color: var(--dark-surface);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-dark);
  }
  
  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    font-family: 'Source Code Pro', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-green);
    text-shadow: var(--glow-green);
  }
  
  .nav {
    display: flex;
    gap: 2rem;
  }
  
  .nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
  }
  
  .nav-link:hover {
    color: var(--primary-green);
  }
  
  /* Hero Section */
  .hero {
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-surface) 100%);
  }
  
  .hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
  }
  
  .hero-left {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .video-player {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 16/9;
    background-color: var(--dark-card);
    border-radius: 12px;
    border: 2px solid var(--border-dark);
    overflow: hidden;
  }
  
  .video-placeholder {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
  }
  
  .play-button {
    cursor: pointer;
    transition: transform 0.3s ease;
  }
  
  .play-button:hover {
    transform: scale(1.1);
    filter: drop-shadow(var(--glow-green));
  }
  
  .video-text {
    color: var(--text-secondary);
    font-weight: 500;
  }
  
  .hero-right {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .course-title {
    font-size: 2.5rem;
    color: var(--primary-green);
    text-shadow: var(--glow-green);
    margin-bottom: 0.5rem;
  }
  
  .course-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.5;
  }
  
  .rating {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
  
  .stars {
    display: flex;
    gap: 0.2rem;
  }
  
  .star {
    font-size: 1.2rem;
    filter: grayscale(1);
  }
  
  .star.filled {
    filter: none;
  }
  
  .star.half {
    filter: none;
    opacity: 0.7;
  }
  
  .rating-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  .course-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem;
    background-color: var(--dark-card);
    border-radius: 12px;
    border: 1px solid var(--border-dark);
  }
  
  .info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .info-label {
    color: var(--text-secondary);
    font-weight: 500;
  }
  
  .info-value {
    color: var(--text-primary);
    font-weight: 600;
  }
  
  .enrollment-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-green);
    text-shadow: var(--glow-green);
  }
  
  .enroll-btn {
    background: linear-gradient(135deg, var(--primary-green) 0%, #b8e642 100%);
    color: var(--dark-bg);
    font-family: 'Source Code Pro', monospace;
    font-size: 1.1rem;
    font-weight: 700;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--glow-green);
  }
  
  .enroll-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(209, 255, 82, 0.5);
  }
  
  /* Preview Carousel */
  .preview-carousel {
    margin-top: 2rem;
  }
  
  .carousel-container {
    display: flex;
    gap: 1rem;
    justify-content: center;
  }
  
  .preview-thumbnail {
    width: 120px;
    height: 80px;
    background-color: var(--dark-card);
    border: 2px solid var(--border-dark);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  .preview-thumbnail.active {
    border-color: var(--primary-green);
    box-shadow: 0 0 10px rgba(209, 255, 82, 0.3);
  }
  
  .preview-thumbnail:hover {
    border-color: var(--light-blue);
  }
  
  .thumbnail-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
  }
  
  /* Tabs Section */
  .tabs-section {
    padding: 2rem 0;
    background-color: var(--dark-surface);
  }
  
  .tabs-header {
    display: flex;
    gap: 2rem;
    border-bottom: 2px solid var(--border-dark);
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    background-color: var(--dark-surface);
    z-index: 10;
    padding-bottom: 1rem;
  }
  
  .tab-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: 'Source Code Pro', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 1rem 0;
    cursor: pointer;
    position: relative;
    transition: color 0.3s ease;
  }
  
  .tab-btn.active {
    color: var(--primary-green);
  }
  
  .tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-green);
    box-shadow: var(--glow-green);
  }
  
  .tab-btn:hover {
    color: var(--primary-green);
  }
  
  .tab-content {
    min-height: 400px;
  }
  
  .tab-pane {
    animation: fadeIn 0.3s ease;
  }
  
  .tab-pane.hidden {
    display: none;
  }
  
  
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  /* Overview Tab */
  .course-description, .what-you-learn {
    margin-bottom: 2rem;
  }
  
  .course-description h3, .what-you-learn h3 {
    color: var(--primary-green);
    margin-bottom: 1rem;
    font-size: 1.5rem;
  }
  
  .course-description p {
    color: var(--text-secondary);
    line-height: 1.7;
  }
  
  .learn-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .learn-list li {
    color: var(--text-primary);
    padding-left: 2rem;
    position: relative;
  }
  
  .learn-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: bold;
    font-size: 1.2rem;
  }
  
  /* Modules Tab */
  .modules-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .module-item {
    background-color: var(--dark-card);
    border: 1px solid var(--border-dark);
    border-radius: 8px;
    overflow: hidden;
  }
  
  .module-header {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
  }
  
  .module-header:hover {
    background-color: rgba(209, 255, 82, 0.05);
  }
  
  .module-header h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
  }
  
  .module-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  .expand-icon {
    color: var(--primary-green);
    font-size: 1.5rem;
    font-weight: bold;
    transition: transform 0.3s ease;
  }
  
  .module-item.expanded .expand-icon {
    transform: rotate(45deg);
  }
  
  .module-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background-color: rgba(0, 0, 0, 0.3);
  }
  
  .module-item.expanded .module-content {
    max-height: 300px;
  }
  
  .lecture-item {
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-dark);
  }
  
  .lecture-title {
    color: var(--text-primary);
  }
  
  .lecture-duration {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  /* FAQ Tab */
  .faq-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .faq-item {
    background-color: var(--dark-card);
    border: 1px solid var(--border-dark);
    border-radius: 8px;
    overflow: hidden;
  }
  
  .faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
  }
  
  .faq-question:hover {
    background-color: rgba(209, 255, 82, 0.05);
  }
  
  .faq-question h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
  }
  
  .faq-icon {
    color: var(--primary-green);
    font-size: 1.5rem;
    font-weight: bold;
    transition: transform 0.3s ease;
  }
  
  .faq-item.expanded .faq-icon {
    transform: rotate(45deg);
  }
  
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background-color: rgba(0, 0, 0, 0.3);
  }
  
  .faq-item.expanded .faq-answer {
    max-height: 200px;
  }
  
  .faq-answer p {
    padding: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
  }
  
  /* Instructor Section */
  .instructor-section {
    padding: 3rem 0;
    background-color: var(--dark-bg);
  }
  
  .instructor-section h2 {
    color: var(--primary-green);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .instructor-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    background-color: var(--dark-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-dark);
  }
  
  .instructor-photo {
    display: flex;
    justify-content: center;
  }
  
  .photo-placeholder {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--light-blue) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Source Code Pro', monospace;
    font-size: 2rem;
    font-weight: bold;
    color: var(--dark-bg);
  }
  
  .instructor-info h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
  }
  
  .instructor-title {
    color: var(--light-blue);
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  .instructor-bio {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
  }
  
  .social-links {
    display: flex;
    gap: 1rem;
  }
  
  .social-link {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border: 1px solid var(--primary-green);
    border-radius: 6px;
    transition: all 0.3s ease;
  }
  
  .social-link:hover {
    background-color: var(--primary-green);
    color: var(--dark-bg);
  }
  
  /* Benefits Section */
  .benefits-section {
    padding: 3rem 0;
    background-color: var(--dark-surface);
  }
  
  .benefits-section h2 {
    color: var(--primary-green);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
  }
  
  .benefit-card {
    background-color: var(--dark-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-dark);
  }
  
  .benefit-card h3 {
    color: var(--primary-green);
    margin-bottom: 1rem;
  }
  
  .benefit-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .benefit-card li {
    color: var(--text-primary);
    padding-left: 1.5rem;
    position: relative;
  }
  
  .benefit-card li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--light-blue);
  }
  
  .salary-note {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
  }
  
  /* Certificate Section */
  .certificate-section {
    padding: 3rem 0;
    background-color: var(--dark-bg);
  }
  
  .certificate-section h2 {
    color: var(--primary-green);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .certificate-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }
  
  .certificate-preview {
    display: flex;
    justify-content: center;
  }
  
  .certificate-mockup {
    width: 300px;
    height: 200px;
    /*background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);*/
    border-radius: 12px;
    /*padding: 1.5rem;*/
    color: var(--dark-bg);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  }
  
  .cert-header h3 {
    font-size: 1.2rem;
    color: var(--primary-green);
  }
  
  .cert-header p {
    font-size: 0.9rem;
    margin-top: 0.5rem;
  }
  
  .cert-body p {
    font-size: 0.8rem;
    margin: 0.25rem 0;
  }
  
  .cert-body h4 {
    font-size: 1rem;
    margin: 0.5rem 0;
  }
  
  .certificate-info h3 {
    color: var(--primary-green);
    margin-bottom: 1rem;
  }
  
  .certificate-info ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .certificate-info li {
    color: var(--text-primary);
    padding-left: 2rem;
    position: relative;
  }
  
  .certificate-info li::before {
    content: '🎓';
    position: absolute;
    left: 0;
  }
  
  /* Resources Section */
  .resources-section {
    padding: 3rem 0;
    background-color: var(--dark-surface);
  }
  
  .resources-section h2 {
    color: var(--primary-green);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
  }
  
  .resource-item {
    background-color: var(--dark-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-dark);
    text-align: center;
    transition: transform 0.3s ease;
  }
  
  .resource-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-green);
  }
  
  .resource-item h3 {
    color: var(--primary-green);
    margin-bottom: 1rem;
  }
  
  .resource-item p {
    color: var(--text-secondary);
  }
  
  /* Reviews Section */
  .reviews-section {
    padding: 3rem 0;
    background-color: var(--dark-bg);
  }
  
  .reviews-section h2 {
    color: var(--primary-green);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .reviews-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-dark);
  }
  
  .overall-rating {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
  
  .rating-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-green);
  }
  
  .rating-count {
    color: var(--text-secondary);
  }
  
  .rating-filters {
    display: flex;
    gap: 0.5rem;
  }
  
  .filter-btn {
    background: none;
    border: 1px solid var(--border-dark);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  .filter-btn.active,
  .filter-btn:hover {
    background-color: var(--primary-green);
    color: var(--dark-bg);
    border-color: var(--primary-green);
  }
  
  .reviews-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
  }
  
  .review-card {
    background-color: var(--dark-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-dark);
  }
  
  .review-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  
  .reviewer-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--light-blue) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--dark-bg);
  }
  
  .reviewer-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
  }
  
  .review-rating {
    display: flex;
    gap: 0.2rem;
  }
  
  .review-text {
    color: var(--text-secondary);
    line-height: 1.6;
  }
  
  /* Related Courses Section */
  .related-courses-section {
    padding: 3rem 0;
    background-color: var(--dark-surface);
  }
  
  .related-courses-section h2 {
    color: var(--primary-green);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
  }
  
  .courses-scroll {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    padding-bottom: 1rem;
  }
  
  .course-card {
    min-width: 280px;
    background-color: var(--dark-card);
    border-radius: 12px;
    border: 1px solid var(--border-dark);
    overflow: hidden;
    transition: transform 0.3s ease;
  }
  
  .course-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-green);
  }
  
  .course-thumbnail {
    height: 160px;
    background: linear-gradient(135deg, var(--border-dark) 0%, var(--dark-surface) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    padding: 1rem;
  }
  
  .course-details {
    padding: 1.5rem;
  }
  
  .course-details h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
  }
  
  .course-rating {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.9rem;
  }
  
  .course-rating .stars {
    color: #ffc107;
  }
  
  .course-rating span:last-child {
    color: var(--text-secondary);
  }
  
  .course-price {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-green);
  }
  
  /* Modal */
  .modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
  }
  
  .modal.hidden {
    display: none;
  }
  
  .modal-content {
    background-color: var(--dark-card);
    border-radius: 12px;
    border: 1px solid var(--border-dark);
    max-width: 500px;
    width: 90%;
    overflow: hidden;
  }
  
  .modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .modal-header h3 {
    color: var(--primary-green);
  }
  
  .modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .modal-close:hover {
    color: var(--primary-green);
  }
  
  .modal-body {
    padding: 2rem;
  }
  
  .course-summary {
    background-color: var(--dark-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0 2rem 0;
  }
  
  .course-summary h4 {
    color: var(--primary-green);
    margin-bottom: 0.5rem;
  }
  
  .course-summary p {
    color: var(--text-secondary);
    margin: 0.25rem 0;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    .hero-content {
      grid-template-columns: 1fr;
      gap: 2rem;
    }
    
    .course-title {
      font-size: 2rem;
    }
    
    .tabs-header {
      gap: 1rem;
    }
    
    .tab-btn {
      font-size: 1rem;
    }
    
    .instructor-card {
      grid-template-columns: 1fr;
      text-align: center;
    }
    
    .certificate-content {
      grid-template-columns: 1fr;
    }
    
    .reviews-header {
      flex-direction: column;
      gap: 1rem;
    }
    
    .reviews-list {
      grid-template-columns: 1fr;
    }
    
    .carousel-container {
      flex-wrap: wrap;
    }
    
    .nav {
      display: none;
    }
  }
  
  @media (max-width: 480px) {
    .container {
      padding: 0 15px;
    }
    
    .course-title {
      font-size: 1.5rem;
    }
    
    .hero {
      padding: 2rem 0;
    }
    
    .tabs-section, .instructor-section, .benefits-section, 
    .certificate-section, .resources-section, .reviews-section, 
    .related-courses-section {
      padding: 2rem 0;
    }
  }