/* Main Styles */
:root {
  /* Color Variables */
  --primary: #13334d;
  --primary-dark: #0d47a1;
  --primary-light: #64b5f6;
  --secondary: #607d8b;
  --secondary-dark: #455a64;
  --secondary-light: #90a4ae;
  --accent: #ff5a2d;
  --accent-dark: #dd2c00;
  --accent-light: #ffab91;
  --text-dark: #333333;
  --text-light: #f5f5f5;
  --text-muted: #757575;
  --background: #ffffff;
  --background-alt: #f5f7fa;
  --gray-light: #e0e0e0;
  --gray: #9e9e9e;
  --success: #4caf50;
  --warning: #ff9800;
  --error: #f44336;
  
  /* Spacing */
  --spacing-xs: 0.8rem;
  --spacing-sm: 1.6rem;
  --spacing-md: 2.4rem;
  --spacing-lg: 3.2rem;
  --spacing-xl: 4.8rem;
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.14);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Global Classes */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  font-size: 3.6rem;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -1rem;
  left: 50%;
  transform: translateX(-50%);
  width: 6rem;
  height: 0.3rem;
  background-color: var(--accent);
  border-radius: 0.2rem;
}

.section-header p {
  font-size: 1.8rem;
  color: var(--text-muted);
}

.btn-primary {
  display: inline-block;
  background-color: var(--accent);
  color: var(--text-light);
  font-weight: 600;
  padding: 1.2rem 2.4rem;
  border-radius: var(--border-radius-md);
  transition: var(--transition-normal);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--primary);
  font-weight: 600;
  padding: 1rem 2rem;
  border: 2px solid var(--primary);
  border-radius: var(--border-radius-md);
  transition: var(--transition-normal);
  text-align: center;
}

.btn-secondary:hover {
  background-color: var(--primary);
  color: var(--text-light);
}

/* Sections */
section {
  padding: var(--spacing-xl) 0;
}

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

@keyframes slideFromLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideFromRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 3rem;
  right: 3rem;
  width: 4.5rem;
  height: 4.5rem;
  background-color: var(--primary);
  color: var(--text-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  z-index: 999;
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-5px);
}

/* Responsive */
@media (max-width: 992px) {
  html {
    font-size: 60%;
  }
  
  .section-header h2 {
    font-size: 3.2rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 58%;
  }
  
  .section-header h2 {
    font-size: 2.8rem;
  }
  
  section {
    padding: var(--spacing-lg) 0;
  }
}

@media (max-width: 576px) {
  html {
    font-size: 55%;
  }
  
  .section-header h2 {
    font-size: 2.6rem;
  }
  
  .btn-primary, .btn-secondary {
    padding: 1rem 2rem;
  }
}