/* Environmental Blasting Guide - Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-blue: #0f3a6e;
  --dark-blue: #082856;
  --steel-gray: #4a5568;
  --light-gray: #f7fafc;
  --accent-orange: #f97316;
  --accent-light-orange: #fca5a5;
  --text-dark: #1a202c;
  --text-light: #718096;
  --border-color: #e2e8f0;
  --success-green: #22863a;
  --spacing-unit: 1rem;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: #ffffff;
}

/* Header & Navigation */
header {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
  color: white;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.logo::before {
  content: '⚙️';
  font-size: 1.8rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

nav a {
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.3s ease;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}

nav a:hover {
  color: var(--accent-orange);
  border-bottom-color: var(--accent-orange);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
  color: white;
  padding: 6rem 2rem;
  text-align: center;
}

.hero-container {
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  line-height: 1.8;
  opacity: 0.95;
}

.cta-primary, .cta-secondary {
  display: inline-block;
  padding: 0.75rem 2rem;
  margin: 0.5rem;
  border-radius: 0.375rem;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.cta-primary {
  background-color: var(--accent-orange);
  color: white;
}

.cta-primary:hover {
  background-color: #ea580c;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.cta-secondary {
  background-color: transparent;
  color: white;
  border: 2px solid white;
}

.cta-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-orange);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Sections */
section {
  padding: 4rem 2rem;
}

section:nth-child(even) {
  background-color: var(--light-gray);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 1rem;
  border-bottom: 3px solid var(--accent-orange);
  padding-bottom: 0.5rem;
  display: inline-block;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-blue);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--steel-gray);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-dark);
  line-height: 1.8;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

/* Cards */
.card {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2rem;
  transition: all 0.3s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card:hover {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.card h3 {
  margin-top: 0;
  color: var(--primary-blue);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.card-badge {
  display: inline-block;
  background-color: var(--accent-orange);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

/* Feature Section */
.feature {
  margin: 2rem 0;
  padding: 2rem;
  background: white;
  border-left: 4px solid var(--accent-orange);
  border-radius: 0.375rem;
}

.feature h4 {
  color: var(--primary-blue);
  margin-top: 0;
}

/* Table Styles */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: white;
}

table thead {
  background-color: var(--primary-blue);
  color: white;
}

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

table tbody tr:hover {
  background-color: var(--light-gray);
}

/* Lists */
ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
  line-height: 1.8;
}

.check-list li::before {
  content: '✓ ';
  color: var(--success-green);
  font-weight: 700;
  margin-right: 0.5rem;
}

/* Comparison Boxes */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.comparison-item {
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2rem;
  text-align: center;
}

.comparison-item.featured {
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

.comparison-item h4 {
  color: var(--primary-blue);
  margin-top: 0;
  font-size: 1.25rem;
}

.comparison-pros, .comparison-cons {
  text-align: left;
  margin: 1rem 0;
}

.comparison-pros {
  color: var(--success-green);
}

.comparison-cons {
  color: #dc2626;
}

/* Calculator Placeholder */
.calculator-widget {
  background: linear-gradient(135deg, #f7fafc 0%, white 100%);
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 2rem;
  margin: 2rem 0;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  font-size: 1rem;
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

.calculation-result {
  background-color: var(--light-gray);
  border-left: 4px solid var(--accent-orange);
  padding: 1.5rem;
  border-radius: 0.375rem;
  margin-top: 1.5rem;
}

.result-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin: 0.5rem 0;
}

/* Breadcrumb */
.breadcrumb {
  background-color: var(--light-gray);
  padding: 1rem 2rem;
  margin-bottom: 2rem;
  border-radius: 0.375rem;
}

.breadcrumb a, .breadcrumb span {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9rem;
}

.breadcrumb a:hover {
  color: var(--accent-orange);
}

.breadcrumb span {
  margin: 0 0.5rem;
}

/* Callout Boxes */
.callout {
  padding: 1.5rem;
  border-radius: 0.375rem;
  margin: 2rem 0;
  border-left: 4px solid;
}

.callout.info {
  background-color: #e3f2fd;
  border-left-color: #1976d2;
}

.callout.warning {
  background-color: #fff3e0;
  border-left-color: #f57c00;
}

.callout.success {
  background-color: #e8f5e9;
  border-left-color: var(--success-green);
}

.callout.danger {
  background-color: #ffebee;
  border-left-color: #dc2626;
}

.callout h4 {
  margin-top: 0;
  color: inherit;
}

/* Footer */
footer {
  background-color: var(--dark-blue);
  color: white;
  padding: 3rem 2rem 1rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.footer-section h4 {
  color: white;
  margin-top: 0;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.footer-section a:hover {
  color: var(--accent-orange);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* Article Meta */
.article-meta {
  display: flex;
  gap: 2rem;
  margin: 2rem 0;
  padding: 1rem;
  background-color: var(--light-gray);
  border-radius: 0.375rem;
  flex-wrap: wrap;
}

.meta-item {
  font-size: 0.9rem;
  color: var(--text-light);
}

.meta-label {
  font-weight: 600;
  color: var(--primary-blue);
}

/* Responsive */
@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
    font-size: 0.85rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  h2 {
    font-size: 1.8rem;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: 2rem 1rem;
  }
}

@media (max-width: 480px) {
  .header-container {
    flex-direction: column;
    gap: 1rem;
  }

  nav ul {
    flex-direction: column;
    gap: 1rem;
  }

  .hero {
    padding: 3rem 1rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }
}