:root {
  /* Color Palette - Construction Theme */
  --primary: #FF7B00;
  /* Safety orange */
  --primary-hover: #E66A00;
  --secondary: #003366;
  /* Deep trust blue */
  --background: #F4F7F6;
  --surface: #FFFFFF;
  --text-main: #212529;
  --text-muted: #6C757D;
  --border: #DEE2E6;
  --error: #DC3545;
  --success: #28A745;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 4px 6px 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);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--background);
  color: var(--text-main);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--secondary);
  color: white;
  padding: var(--spacing-md) 0;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo a {
  color: white;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo img {
  max-height: 60px;
  width: auto;
  display: block;
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
  padding: 0;
  margin: 0;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--primary);
}

main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  width: 100%;
}

h1,
h2,
h3 {
  color: var(--secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

p {
  margin-bottom: var(--spacing-md);
}

ul,
ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-xs);
}

footer {
  background-color: var(--text-main);
  color: white;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  margin-top: auto;
}

/* Utilities */
.container {
  max-width: 800px;
  margin: 0 auto;
}

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

.mb-4 {
  margin-bottom: var(--spacing-xl);
}

/* Responsive Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--secondary);
    padding: var(--spacing-md);
  }

  nav.active {
    display: block;
  }

  nav ul {
    flex-direction: column;
    text-align: center;
  }
}