/* Main Styles */
:root {
  /* Colors */
  --primary-color: #1a73e8;
  --primary-dark: #0d47a1;
  --primary-light: #4285f4;
  --secondary-color: #34a853;
  --accent-color: #ea4335;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-tertiary: #80868b;
  --background-primary: #ffffff;
  --background-secondary: #f8f9fa;
  --background-tertiary: #f1f3f4;

  /* 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: 0.4rem;
  --border-radius-md: 0.8rem;
  --border-radius-lg: 1.6rem;
  --border-radius-xl: 2.4rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.container {
  width: 100%;
  max-width: 120rem;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-header h2 {
  font-size: 3.6rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.section-header p {
  font-size: 1.8rem;
  color: var(--text-secondary);
  max-width: 60rem;
  margin: 0 auto;
}

.highlight {
  color: var(--primary-color);
}

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

.wave-divider {
  position: relative;
  width: 100%;
  margin-top: -10rem;
}

.back-to-top {
  position: fixed;
  bottom: 3rem;
  right: 3rem;
  width: 5rem;
  height: 5rem;
  background-color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

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

/* Responsive Breakpoints */
@media (max-width: 1200px) {
  html {
    font-size: 60%;
  }
}

@media (max-width: 992px) {
  html {
    font-size: 58%;
  }
  
  section {
    padding: var(--spacing-lg) 0;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 56%;
  }
  
  .section-header h2 {
    font-size: 3rem;
  }
}

@media (max-width: 576px) {
  html {
    font-size: 54%;
  }
  
  .section-header h2 {
    font-size: 2.8rem;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}