/**
 * Modern CSS Framework for Kruton.online
 * Version: 2.0
 * ========================================
 */

/* CSS Variables (Custom Properties) */
:root {
  /* Colors */
  --primary-color: #3b82f6;
  --primary-dark: #1d4ed8;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --success-color: #10b981;
  --info-color: #06b6d4;
  
  /* Neutral Colors */
  --white: #ffffff;
  --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;
  
  /* Typography */
  --font-family-sans: 'Inter', 'Sarabun', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family-mono: 'Fira Code', 'Consolas', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--gray-700);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }

.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Colors */
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-gray-500 { color: var(--gray-500); }
.text-gray-600 { color: var(--gray-600); }
.text-gray-700 { color: var(--gray-700); }
.text-gray-800 { color: var(--gray-800); }
.text-white { color: var(--white); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-white { background-color: var(--white); }
.bg-gray-50 { background-color: var(--gray-50); }
.bg-gray-100 { background-color: var(--gray-100); }

/* Modern Layout System */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--space-4);
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

.justify-center { justify-content: center; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.flex-1 { flex: 1; }
.flex-auto { flex: auto; }
.flex-none { flex: none; }

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Spacing */
.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }

.m-0 { margin: 0; }
.m-2 { margin: var(--space-2); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }

.mx-auto { margin-left: auto; margin-right: auto; }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-8 { margin-bottom: var(--space-8); }

/* Modern Components */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-200);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

/* Modern Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 2px var(--primary-color);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: var(--white);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #1e40af 100%);
  transform: translateY(-1px);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary-color) 0%, #059669 100%);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: var(--white);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* Modern Forms */
.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  background: var(--white);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
}

.form-input:invalid {
  border-color: var(--danger-color);
}

/* Modern Navigation */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-normal);
}

.navbar-brand {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: var(--space-8);
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--gray-600);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

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

/* Modern Alerts */
.alert {
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  border-left: 4px solid;
}

.alert-success {
  background: rgb(16 185 129 / 0.1);
  border-left-color: var(--success-color);
  color: #065f46;
}

.alert-warning {
  background: rgb(245 158 11 / 0.1);
  border-left-color: var(--warning-color);
  color: #92400e;
}

.alert-danger {
  background: rgb(239 68 68 / 0.1);
  border-left-color: var(--danger-color);
  color: #991b1b;
}

.alert-info {
  background: rgb(6 182 212 / 0.1);
  border-left-color: var(--info-color);
  color: #155e75;
}

/* Modern Table */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table th,
.table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.table th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--gray-700);
}

.table tbody tr:hover {
  background: var(--gray-50);
}

/* Utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.transition { transition: all var(--transition-normal); }

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .grid-cols-2 { grid-template-columns: 1fr; }
  .grid-cols-3 { grid-template-columns: 1fr; }
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  
  .navbar-nav {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .btn-lg {
    width: 100%;
  }
  
  .text-5xl { font-size: var(--text-3xl); }
  .text-4xl { font-size: var(--text-2xl); }
}

@media (max-width: 480px) {
  .grid-cols-4 { grid-template-columns: 1fr; }
  
  .px-6 { padding-left: var(--space-4); padding-right: var(--space-4); }
  .py-6 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --gray-50: #1f2937;
    --gray-100: #374151;
    --gray-200: #4b5563;
    --gray-300: #6b7280;
    --gray-400: #9ca3af;
    --gray-500: #d1d5db;
    --gray-600: #e5e7eb;
    --gray-700: #f3f4f6;
    --gray-800: #f9fafb;
    --gray-900: #ffffff;
  }
  
  body {
    background-color: var(--gray-50);
    color: var(--gray-700);
  }
}

/* Animation Classes */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide-in {
  animation: slideIn 0.5s ease-out;
}

/* Loading States */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Modern Navigation Styles */
.modern-navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.modern-navbar.scrolled {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

/* Top Bar */
.top-bar {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar-left .site-title {
    font-weight: 600;
}

.top-bar-links {
    display: flex;
    gap: 1rem;
}

.top-bar-link {
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: opacity 0.3s ease;
}

.top-bar-link:hover {
    opacity: 0.8;
    color: var(--white);
}

.top-bar-link i {
    font-size: 0.875rem;
}

/* Main Navigation */
.main-nav {
    background: var(--white);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo .logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--primary-color);
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Navigation Menu */
.nav-menu {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.5rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-link:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    text-decoration: none;
}

.nav-item.active .nav-link {
    background: var(--primary-color);
    color: var(--white);
}

.nav-link i {
    font-size: 1rem;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 4px;
}

.toggle-line {
    width: 24px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-toggle.active .toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-toggle.active .toggle-line:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active .toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Styles */
@media (max-width: 768px) {
    .top-bar-content {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .top-bar-links {
        justify-content: center;
    }
    
    .nav-content {
        flex-wrap: wrap;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        flex-basis: 100%;
        order: 3;
        margin-top: 1rem;
        display: none;
    }
    
    .nav-menu.active {
        display: block;
    }
    
    .nav-list {
        flex-direction: column;
        background: var(--white);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        padding: 1rem;
        gap: 0;
    }
    
    .nav-link {
        border-radius: 0;
        border-bottom: 1px solid var(--border-color);
        justify-content: flex-start;
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .logo-text {
        display: none;
    }
}

/* Homepage Specific Styles */
.main-content {
    margin-top: 0;
    padding-top: 0;
}

/* Hero Section Improvements */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    min-height: 60vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 2rem;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.9);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.text-accent {
    color: #fbbf24;
}

/* CTA Buttons */
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
}

/* Welcome Message Card */
.welcome-message {
    background: var(--white);
    border-radius: 1rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    max-width: 400px;
    margin: 0 auto;
    transform: translateY(20px);
    animation: slideUp 0.6s ease forwards;
}

@keyframes slideUp {
    to {
        transform: translateY(0);
    }
}

/* Features Section Improvements */
.features-section {
    padding: 4rem 0;
    background: var(--gray-50);
}

.feature-card {
    background: var(--white);
    border-radius: 1rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.icon-wrapper {
    margin-bottom: 1.5rem;
}

.icon-wrapper .w-16 {
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

/* Grid System Improvements */
.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Animation */
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Responsive Improvements */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-lg {
        width: 100%;
        max-width: 300px;
    }
    
    .features-section {
        padding: 2rem 0;
    }
    
    .grid-cols-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-section {
        min-height: 50vh;
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
}

/* Dropdown Navigation Improvements */
.nav-item.dropdown {
    position: relative;
}

.dropdown-toggle {
    position: relative;
}

.dropdown-toggle .fa-chevron-down {
    margin-left: 0.5rem;
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.nav-item.dropdown:hover .dropdown-toggle .fa-chevron-down {
    transform: rotate(180deg);
}

.sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    min-width: 220px;
    z-index: 1000;
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
}

.nav-item.dropdown:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sub-menu .nav-item {
    width: 100%;
}

.sub-menu .nav-link {
    padding: 0.75rem 1rem;
    border-radius: 0;
    color: var(--text-color);
    font-weight: 400;
    border-bottom: 1px solid var(--border-color);
    display: block;
    width: 100%;
}

.sub-menu .nav-item:last-child .nav-link {
    border-bottom: none;
}

.sub-menu .nav-link:hover {
    background: var(--gray-50);
    color: var(--primary-color);
}

/* Mobile Contact Info */
.mobile-contact-info {
    display: none;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background: var(--gray-50);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.contact-item {
    padding: 0.5rem 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.contact-item i {
    margin-right: 0.5rem;
    color: var(--primary-color);
    width: 16px;
}

.contact-item strong {
    color: var(--text-color);
    font-size: 1rem;
}

/* Enhanced Mobile Styles */
@media (max-width: 768px) {
    .nav-menu.active .mobile-contact-info {
        display: block;
    }
    
    .nav-item.dropdown {
        position: static;
    }
    
    .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        background: var(--gray-50);
        margin: 0;
        padding: 0;
        display: none;
    }
    
    .nav-item.dropdown.active .sub-menu {
        display: block;
    }
    
    .sub-menu .nav-link {
        padding-left: 2rem;
        font-size: 0.875rem;
    }
    
    .dropdown-toggle {
        position: relative;
    }
    
    .dropdown-toggle::after {
        content: '';
        position: absolute;
        right: 1rem;
        top: 50%;
        transform: translateY(-50%);
        width: 0;
        height: 0;
        border-left: 5px solid transparent;
        border-right: 5px solid transparent;
        border-top: 5px solid var(--text-muted);
        transition: transform 0.3s ease;
    }
    
    .nav-item.dropdown.active .dropdown-toggle::after {
        transform: translateY(-50%) rotate(180deg);
    }
}

/* JavaScript Enhancement Classes */
.nav-item.dropdown.js-enhanced .sub-menu {
    display: none;
}

.nav-item.dropdown.js-enhanced.active .sub-menu {
    display: block;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading States */
.nav-link.loading {
    position: relative;
    pointer-events: none;
}

.nav-link.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}