:root {
  --primary-green: #059669;
  /* Modern sustainable green */
  --primary-green-hover: #047857;
  --secondary-blue: #1e3a8a;
  /* Professional engineering blue */
  --secondary-blue-hover: #172554;
  --bg-color: #f8fafc;
  --text-dark: #0f172a;
  --text-light: #64748b;
  --white: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.2);
  --transition: all 0.3s ease;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
  font-family: 'Inter', sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  text-align: center;
  color: var(--secondary-blue);
}

a {
  text-decoration: none;
  color: var(--text-dark);
}

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

.section-padding {
  padding: 5rem 0;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 9999px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--primary-green);
  color: var(--white);
  box-shadow: 0 4px 14px 0 rgba(5, 150, 105, 0.39);
}

.btn-primary:hover {
  background-color: var(--primary-green-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.23);
  color: var(--white);
}

.btn-secondary {
  background-color: var(--secondary-blue);
  color: var(--white);
}

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

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

.btn-outline:hover {
  background-color: var(--primary-green);
  color: var(--white);
}

/* Topbar */
.topbar {
  background-color: var(--secondary-blue);
  color: var(--white);
  font-size: 0.875rem;
  padding: 0.5rem 0;
}

.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar-info {
  display: flex;
  gap: 1.5rem;
}

.topbar-info span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.topbar-social {
  display: flex;
  align-items: center;
}

.social-icons-top {
  display: flex;
  gap: 1rem;
}

.social-icons-top a {
  color: var(--white);
  font-size: 1rem;
  transition: var(--transition);
}

.social-icons-top a:hover {
  color: var(--primary-green);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--secondary-blue);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--primary-green);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-green);
}

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--primary-green);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-quote {
  background-color: var(--primary-green);
  color: var(--white);
  padding: 0.6rem 1.2rem;
  border-radius: 9999px;
  font-weight: 600;
  transition: var(--transition);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.4);
  }

  70% {
    box-shadow: 0 0 0 10px rgba(5, 150, 105, 0);
  }

  100% {
    box-shadow: 0 0 0 0 rgba(5, 150, 105, 0);
  }
}

.btn-quote:hover {
  background-color: var(--primary-green-hover);
  animation: none;
  transform: translateY(-2px);
  color: var(--white);
}

.menu-toggle {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--secondary-blue);
}

/* Hero Section */
.hero {
  min-height: calc(100vh - 80px - 32px);
  /* Calc subtracts header and topbar */
  background: linear-gradient(rgba(15, 23, 42, 0.75), rgba(15, 23, 42, 0.8)), url('../img/hero_background.png') center/cover no-repeat;
  display: flex;
  align-items: center;
  position: relative;
}

.hero-content {
  text-align: center;
  color: var(--white);
  max-width: 800px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  animation: slideUp 1s ease;
}

.hero-content p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: #cbd5e1;
  animation: slideUp 1s ease 0.2s;
  animation-fill-mode: both;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: slideUp 1s ease 0.4s;
  animation-fill-mode: both;
}

/* Metrics Strip */
.metrics-strip {
  background: linear-gradient(90deg, var(--secondary-blue), var(--primary-green));
  color: var(--white);
  padding: 2rem 0;
  margin-top: -1px;
  /* Avoid tiny gaps */
  position: relative;
  overflow: hidden;
}

.metrics-strip::before {
  content: '';
  position: absolute;
  top: 0;
  left: -150%;
  width: 50%;
  height: 100%;
  background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.3) 50%, rgba(255, 255, 255, 0) 100%);
  transform: skewX(-25deg);
  animation: shine 6s infinite;
}

@keyframes shine {
  0% {
    left: -150%;
  }

  20% {
    left: 200%;
  }

  100% {
    left: 200%;
  }
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.metric-number {
  font-size: 2.5rem;
  font-weight: 800;
}

.metric-label {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.9;
}

/* Common Section Layout */
.section {
  padding: 6rem 0;
}

.section-light {
  background-color: var(--white);
}

.section-dark {
  background-color: var(--bg-color);
}

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

.card {
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  padding: 2rem;
  /* Restore missing padding for cards without an inner body */
}

/* Modifier class for cards that contain an image -> no padding */
.card.card-with-img {
  padding: 0;
}

.card-img-top {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

.card:hover .card-img-top {
  transform: scale(1.05);
}

/* Explicit internal body for cards with images */
.card-body {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(5, 150, 105, 0.2);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background-color: rgba(5, 150, 105, 0.1);
  color: var(--primary-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

/* If an icon needs to overlap an image inside a card-body */
.card-body .card-icon {
  margin-top: -3.5rem;
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--primary-green);
  z-index: 10;
  position: relative;
}

.card:hover .card-icon {
  background-color: var(--primary-green);
  color: var(--white);
}

/* Clean typography selectors */
.card h3,
.card-body h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-blue);
}

.card p,
.card-body p {
  color: var(--text-light);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card .btn,
.card-body .btn {
  align-self: flex-start;
  margin-top: auto;
}

/* About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-content h2 {
  text-align: left;
}

.about-content p {
  color: var(--text-light);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.values-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

.value-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.value-icon {
  color: var(--primary-green);
  font-size: 1.5rem;
  margin-top: 0.2rem;
}

.value-item h4 {
  color: var(--secondary-blue);
  margin-bottom: 0.5rem;
}

.value-item p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Contact Section */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  background: var(--white);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.contact-info {
  background-color: var(--secondary-blue);
  color: var(--white);
  padding: 3rem;
  display: flex;
  flex-direction: column;
}

.contact-info h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.contact-info p {
  color: #cbd5e1;
  margin-bottom: 2rem;
}

.info-items {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.info-icon {
  font-size: 1.5rem;
  color: var(--primary-green);
}

.info-item h4 {
  margin-bottom: 0.2rem;
}

.info-item p {
  margin-bottom: 0;
  color: #cbd5e1;
  font-size: 0.9rem;
}

.contact-form {
  padding: 3rem;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--secondary-blue);
  font-size: 0.95rem;
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
  background-color: #f8fafc;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.1);
  background-color: var(--white);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.submit-btn {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  margin-top: 1rem;
}

/* Footer */
footer {
  background-color: #0f172a;
  color: white;
  padding: 3rem 0 1.5rem;
  text-align: center;
}

footer p {
  color: #94a3b8;
  font-size: 0.9rem;
}

.social-icons-footer {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

.social-icons-footer a {
  color: var(--white);
  font-size: 1.25rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-icons-footer a:hover {
  background-color: var(--primary-green);
  border-color: var(--primary-green);
  transform: translateY(-3px);
  color: var(--white);
}

/* Animations */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 992px) {

  .about-grid,
  .contact-container {
    grid-template-columns: 1fr;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .topbar {
    display: none;
  }

  .nav-links {
    position: absolute;
    top: 80px;
    left: -100%;
    width: 100%;
    background-color: var(--white);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
  }

  .nav-links.active {
    left: 0;
  }

  .menu-toggle {
    display: block;
  }

  .header-actions {
    display: none;
  }

  .nav-links .btn-quote {
    display: inline-block;
    margin-top: 1rem;
  }
}