@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&display=swap');

:root {
  --color-dark-green: #2B4F43;
  --color-light-green: #66BB6A;
  --color-dark: #333;
  --color-accent: #FFC107;
  --color-white: #fff;
  --color-light-gray: #f8f8f8;
  --color-medium-gray: #e0e0e0;
  --font-primary: 'Montserrat', sans-serif;
  --spacing-unit: 1rem;
  --max-width: 1200px;
  --border-radius: 0.5rem;
  --transition-speed: 0.3s;
  --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --error-color: #f44336;
  --success-color: #4CAF50;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--color-dark);
  line-height: 1.6;
  background-color: var(--color-light-gray);
  -webkit-font-smoothing: antialiased;
  transition: opacity 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-dark-green);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1rem;
}

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

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

a {
  color: var(--color-light-green);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

a:hover {
  color: var(--color-dark-green);
}

/* Reusable Components */
.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-unit);
}

main {
  padding: calc(var(--spacing-unit) * 2) 0;
  min-height: 70vh;
}

.centered {
  text-align: center;
  margin: 2rem 0;
}

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

.section-title {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
  color: var(--color-dark-green);
}

h2 {
  text-align: center;
  margin-bottom: 1.25rem;
}

/* Button Styles */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-speed) ease;
  cursor: pointer;
  text-align: center;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-light-green);
  border: 2px solid currentColor;
}

.btn-secondary:hover {
  background: var(--color-light-green);
  color: var(--color-white);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-dark);
}

.btn-accent:hover {
  opacity: 0.9;
}

/* Header & Navigation */
header {
  background-color: var(--color-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: transform 0.3s ease;
}

.header-hidden {
  transform: translateY(-100%);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
}

.logo img {
  height: 50px;
  width: auto;
}

nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav ul li {
  margin-left: 1.5rem;
}

nav ul li a {
  color: var(--color-dark);
  font-weight: 600;
  text-decoration: none;
  padding: 0.5rem 0;
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-light-green);
  transition: width var(--transition-speed) ease;
}

nav ul li a:hover::after,
nav ul li a.active::after {
  width: 100%;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--color-dark-green);
}

/* Mobile Navigation */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  position: relative;
  height: 70vh;
  background-color: var(--color-dark-green);
  background-image: url('../images/banner.png');
  background-size: cover;
  background-position: center;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-white);
  padding: 2rem;
  max-width: 800px;
  width: 90%;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--color-white);
}

.hero-content p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

/* Intro Section */
.intro {
  text-align: center;
  padding: 4rem 0;
  max-width: 800px;
  margin: 0 auto;
}

/* Services Overview */
.services-overview {
  padding: 4rem 0;
  background-color: var(--color-white);
  box-shadow: var(--box-shadow);
  border-radius: var(--border-radius);
  margin: 2rem auto;
  text-align: center;
}

.services-overview h2 {
  text-align: center;
  margin-bottom: 2rem;
}

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

.service-item {
  background-color: var(--color-light-gray);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: transform var(--transition-speed) ease;
}

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

.service-item h3 {
  margin-bottom: 1rem;
}

.service-item ul {
  margin-left: 1.5rem;
}

/* Service Detail Page */
.service-detail {
  margin-bottom: 3rem;
  background-color: var(--color-white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.service-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  align-items: start;
}

.service-content img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

.service-description h3 {
  margin-top: 1.5rem;
}

/* Projects Section */
.projects-teaser {
  padding: 4rem 0;
}

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

/* Sustainability Teaser */
.sustainability-teaser {
  padding: 4rem 0;
}

.sustainability-content {
  background-color: var(--color-white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  max-width: 800px;
  margin: 0 auto;
}

.sustainability-content ul {
  margin-bottom: 2rem;
}

.project-item {
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: transform var(--transition-speed) ease;
}

.project-item:hover {
  transform: translateY(-5px);
}

.project-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.project-item h4 {
  padding: 1rem 1rem 0.5rem;
  margin-bottom: 0.5rem;
}

.project-item p {
  padding: 0 1rem 1rem;
}

/* Project Case Detail */
.project-case {
  margin-bottom: 3rem;
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  overflow: hidden;
}

.project-case img {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
}

.project-content {
  padding: 2rem;
}

.project-content h2 {
  margin-bottom: 1rem;
}

.project-content h3 {
  margin: 1.5rem 0 0.5rem;
}

.project-content ul {
  margin-bottom: 1.5rem;
}

.intro-text {
  text-align: center;
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 3rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

/* About Section */
.about-section {
  padding: 4rem 0;
}

.about-content {
  background-color: var(--color-white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.about-text {
  max-width: 800px;
  margin: 0 auto;
}

.focus-list {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.focus-list li {
  margin-bottom: 0.5rem;
}

/* Contact Section */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.contact-info,
.contact-form {
  background-color: var(--color-white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.contact-details {
  margin-top: 2rem;
}

.contact-item {
  margin-bottom: 1.5rem;
}

.contact-item h3 {
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

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

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-light-green);
  box-shadow: 0 0 0 3px rgba(102, 187, 106, 0.2);
}

.form-error {
  padding: 0.75rem;
  margin-bottom: 1rem;
  border-radius: var(--border-radius);
  background-color: var(--error-color);
  color: var(--color-white);
  display: none;
  transition: opacity var(--transition-speed) ease;
}

.form-error[hidden="false"] {
  display: block;
}

.form-error[data-success="true"] {
  background-color: var(--success-color);
}

/* Footer */
footer {
  background-color: var(--color-dark-green);
  color: var(--color-white);
  padding: 3rem 0 1rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 2rem;
}

.footer-col h4 {
  color: var(--color-white);
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
}

.footer-col p {
  margin-bottom: 1rem;
  opacity: 0.9;
}

.footer-col a {
  color: var(--color-white);
  text-decoration: none;
  transition: opacity var(--transition-speed) ease;
}

.footer-col a:hover {
  opacity: 0.8;
}

.footer-bottom {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Back to Top Button */
#backToTop {
  display: none;
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99;
  background-color: var(--color-light-green);
  color: var(--color-white);
  width: 3rem;
  height: 3rem;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--box-shadow);
  transition: all var(--transition-speed) ease;
}

#backToTop:hover {
  background-color: var(--color-dark-green);
  transform: translateY(-5px);
}

/* Responsive Design */
@media (max-width: 992px) {
  .service-content {
    grid-template-columns: 1fr;
  }
  
  .contact-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero-content h1 {
    font-size: 2.25rem;
  }
  
  .services-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  header .container {
    flex-direction: column;
    align-items: center;
  }
  
  .logo {
    margin-bottom: 1rem;
  }
  
  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  nav ul li {
    margin: 0.5rem;
  }
  
  .hero {
    height: 60vh;
  }
  
  .service-content img {
    margin-bottom: 1rem;
  }
}

@media (max-width: 480px) {
  .hero {
    height: 50vh;
  }
  
  .hero-content h1 {
    font-size: 1.75rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
  
  .container {
    width: 95%;
    padding: 0.5rem;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }
}