:root {
    /* Color palette */
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --secondary: #6366F1;
    --background: #0f172a;
    --background-light: #1e293b;
    --border-color: rgba(59, 130, 246, 0.3);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Typography */
    --font-family-main: 'Inter', sans-serif;
    --font-family-logo: 'Yeseva One', serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
  }
  
  /* Navigation Styles */
  .top-nav {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
  }
  
  .nav-link {
    color: var(--text-secondary);
    transition: color 0.2s ease;
  }
  
  .nav-link:hover, .nav-link.active {
    color: var(--text-primary);
  }
  
  .nav-dropdown {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 0.5rem;
    width: 200px;
    background-color: var(--background-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 100;
  }
  
  .group:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .dropdown-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    transition: background-color 0.2s ease, color 0.2s ease;
  }
  
  .dropdown-item:hover {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
  }
  
  .dropdown-item.active {
    background-color: var(--primary);
    color: var(--text-primary);
  }
  
  /* Button Styles */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
  }
  
  .btn-primary {
    background-color: var(--primary);
    color: white;
  }
  
  .btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.6);
  }
  
  .btn-secondary {
    background-color: var(--background-light);
    color: var(--text-primary);
  }
  
  .btn-secondary:hover {
    background-color: rgba(59, 130, 246, 0.1);
  }
  
  /* Card Styles */
  .card {
    background-color: var(--background-light);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }
  
  /* Form Elements */
  .form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(100, 116, 139, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all 0.2s ease;
  }
  
  .form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
  }
  
  /* Animation effects */
  @keyframes gradient-slide {
    0% { background-position: 0% 50%; }
    100% { background-position: 300% 50%; }   
  }
  
  .gradient-text {
    font-family: var(--font-family-logo);
    background: linear-gradient(90deg, #3B82F6, #6366F1, #8B5CF6, #3B82F6);
    background-size: 300% 100%;
    animation: gradient-slide 6s linear infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    display: inline-block;
    font-weight: bold;
  }