:root {
  --primary-color: #263238;
  /* Deep Blue Grey */
  --secondary-color: #37474f;
  /* Lighter Blue Grey for backgrounds */
  --accent-color: #FF5722;
  /* Industrial Orange */
  --accent-hover: #E64A19;
  --text-main: #212121;
  --text-light: #757575;
  --bg-white: #ffffff;
  --bg-light: #f5f5f5;
  --nav-height: 80px;
  --max-width: 1200px;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
}

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

body {
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-white);
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul {
  list-style: none;
}

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

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  display: inline-block;
  width: 100%;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--accent-color);
  margin: 10px auto 0;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--accent-color);
  color: white;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s;
}

.btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
}

/* Header */
.header {
  height: var(--nav-height);
  background-color: var(--bg-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-text-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.1;
}

.logo-main {
  font-weight: 400;
  font-size: 1.8rem;
  color: var(--secondary-color);
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--text-light);
  font-weight: 600;
  margin-top: 2px;
}

.logo img {
  height: 60px;
  width: auto;
  flex-shrink: 0;
}

.logo span {
  font-weight: 900;
  color: #1565C0;
  /* Engineering Blue */
}

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

.nav-link {
  font-weight: 500;
  color: var(--text-main);
  font-size: 1rem;
}

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

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  background-image: url('hero-bg.jpg');
  background-size: cover;
  background-position: center;
  color: white;
  padding: 100px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero p {
  color: #cfd8dc;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
}

/* Sections General */
section {
  padding: var(--spacing-lg) 20px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Services */
.services-bg {
  background-color: var(--bg-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.service-card {
  background: white;
  padding: var(--spacing-md);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease;
  border-top: 4px solid var(--accent-color);
}

.service-card:hover {
  transform: translateY(-5px);
}

.service-img-placeholder {
  width: 100%;
  height: 200px;
  background-color: #eee;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  color: #999;
  font-size: 0.9rem;
  text-align: center;
  padding: 10px;
  border-radius: 4px;
}

/* Case Study */
.case-study {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.case-card {
  display: flex;
  flex-direction: column;
  background: white;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  overflow: hidden;
  max-width: 900px;
  width: 100%;
  margin-top: var(--spacing-md);
}

.case-img-placeholder {
  width: 100%;
  height: 300px;
  background-color: #cfd8dc;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary-color);
  font-size: 1.1rem;
  font-weight: 500;
}

.case-content {
  padding: var(--spacing-lg);
  text-align: left;
}

/* Contact / Footer */
.footer {
  background-color: var(--primary-color);
  color: white;
  padding: var(--spacing-lg) 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer h3 {
  color: white;
  border-bottom: 2px solid var(--accent-color);
  display: inline-block;
  padding-bottom: 5px;
  margin-bottom: var(--spacing-md);
}

.footer p,
.footer a {
  color: #b0bec5;
  margin-bottom: 10px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 15px;
}

.contact-icon {
  min-width: 24px;
  text-align: center;
  color: var(--accent-color);
  font-weight: bold;
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.social-placeholder {
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: white;
}

.legal-note {
  grid-column: 1 / -1;
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: #78909c;
}

/* Media Queries */
@media (min-width: 768px) {
  .case-card {
    flex-direction: row;
  }

  .case-img-placeholder {
    width: 50%;
    height: auto;
  }

  .case-content {
    width: 50%;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: var(--bg-white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    display: none;
    text-align: center;
  }

  .nav-menu.active {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

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

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

  .logo-main {
    font-size: 1rem;
  }

  .logo-sub {
    font-size: 0.6rem;
  }
}