/* Global Variables */
:root {
  /* Colors */
  --primary-color: #0f172a; /* Deep Navy Blue - Trust */
  --secondary-color: #10b981; /* Soft Green - Growth */
  --accent-color: #3b82f6; /* Calm Blue */
  --background-color: #ffffff;
  --surface-color: #f8fafc; /* Very light blue-gray */
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  /* Typography */
  --font-family-base: 'Inter', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  
  /* 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);

  /* Transitions */
  --transition-base: all 0.3s ease;
}

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

body {
  font-family: var(--font-family-base);
  color: var(--text-main);
  background-color: var(--surface-color); /* Slightly off-white for depth */
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-base);
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-muted);
}

/* Utility Classes */
.text-center { text-align: center; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  border: none;
  transition: var(--transition-base);
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.btn-primary:hover {
  background-color: #1e293b; /* Slightly lighter navy */
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--text-inverse);
}

.btn-secondary:hover {
  background-color: #059669; /* Darker green */
  transform: translateY(-1px);
}

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

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

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

/* Navbar (Basic) */
.navbar {
  background-color: var(--background-color);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}

.nav-links a {
  font-weight: 500;
  color: var(--text-main);
}

.nav-links a:hover {
  color: var(--accent-color);
}

/* Mobile Menu Toggle (Hidden by default on desktop) */
.menu-toggle {
  display: none;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--primary-color);
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-links {
    display: none; /* JS will toggle this */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--background-color);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    text-align: center;
  }
  
  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    padding: var(--spacing-xs) 0;
  }
}