:root {
  /* Primary Colors */
  --color-concrete: #E3E1DD;
  --color-graphite: #2A2A2A;
  
  /* Secondary Colors */
  --color-oak: #B89B6D;
  --color-iron: #6F6F6F;
  
  /* Accent Colors */
  --color-umber: #8B5E3C;
  --color-steel: #4F6B78;
  
  /* Typography */
  --font-heading: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Layout */
  --max-width: 1200px;
  --grid-gap: 2rem;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-graphite);
  background-color: var(--color-concrete);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--color-graphite);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

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

a {
  color: var(--color-umber);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--color-steel);
}

/* Header & Navigation */
header {
  background-color: var(--color-graphite);
  color: var(--color-concrete);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-concrete);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  white-space: nowrap;
}

.logo:hover {
  color: var(--color-concrete);
  opacity: 0.9;
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: nowrap;
  white-space: nowrap;
}

nav a {
  color: var(--color-concrete);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-xs);
  border-bottom: 2px solid transparent;
  transition: border-color 0.3s ease;
  white-space: nowrap;
  font-size: 0.9rem;
}

nav a:hover {
  border-bottom-color: var(--color-oak);
  color: var(--color-concrete);
}

/* Burger Menu */
.burger-menu {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 5px;
}

.burger-menu span {
  width: 25px;
  height: 2px;
  background-color: var(--color-concrete);
  transition: all 0.3s ease;
}

.burger-menu.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.burger-menu.active span:nth-child(2) {
  opacity: 0;
}

.burger-menu.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-graphite);
  padding: var(--spacing-md);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav ul {
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* Main Content */
main {
  min-height: calc(100vh - 200px);
}

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

.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-umber);
  margin: var(--spacing-sm) auto 0;
}

/* Hero Section */
.hero {
  position: relative;
  height: 70vh;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-graphite);
  color: var(--color-concrete);
  overflow: hidden;
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--spacing-md);
  max-width: 800px;
}

.hero h1 {
  color: var(--color-concrete);
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-concrete);
  opacity: 0.9;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

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

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Cards */
.card {
  background-color: #fff;
  padding: var(--spacing-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  margin-bottom: var(--spacing-sm);
}

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

.image-full {
  width: 100%;
  height: auto;
  margin: var(--spacing-lg) 0;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

/* Text Blocks */
.text-block {
  max-width: 700px;
  margin: 0 auto;
}

.text-block-large {
  max-width: 900px;
  margin: 0 auto;
}

.text-block p {
  font-size: 1.1rem;
  line-height: 1.8;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-graphite);
  color: var(--color-concrete);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-graphite);
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn:hover {
  background-color: transparent;
  color: var(--color-graphite);
}

.btn-secondary {
  background-color: var(--color-umber);
  border-color: var(--color-umber);
  color: var(--color-concrete);
}

.btn-secondary:hover {
  background-color: transparent;
  color: var(--color-umber);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-graphite);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-iron);
  background-color: #fff;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-umber);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  margin-top: 4px;
}

.checkbox-group label {
  font-weight: normal;
  font-size: 0.9rem;
}

/* Footer */
footer {
  background-color: var(--color-graphite);
  color: var(--color-concrete);
  padding: var(--spacing-lg) 0 var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
  color: var(--color-concrete);
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: var(--color-concrete);
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.footer-section a:hover {
  opacity: 1;
  color: var(--color-concrete);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  opacity: 0.7;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--color-graphite);
  color: var(--color-concrete);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  z-index: 999;
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  background-color: var(--color-umber);
  transform: translateY(-3px);
}

/* Process Steps */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.process-step {
  text-align: center;
  padding: var(--spacing-md);
}

.process-step-number {
  width: 60px;
  height: 60px;
  background-color: var(--color-graphite);
  color: var(--color-concrete);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto var(--spacing-sm);
}

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

.material-item {
  background-color: #fff;
  padding: var(--spacing-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.material-item h3 {
  color: var(--color-umber);
  margin-bottom: var(--spacing-xs);
}

/* Service List */
.service-list {
  list-style: none;
  max-width: 700px;
  margin: 0 auto;
}

.service-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-iron);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.service-list li:last-child {
  border-bottom: none;
}

.service-list li::before {
  content: '→';
  color: var(--color-umber);
  margin-right: var(--spacing-sm);
  font-weight: bold;
}

@media (max-width: 1024px) {
  nav {
    display: none;
  }
  
  .burger-menu {
    display: flex;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }
  
  .logo {
    font-size: 1rem;
  }
  
  .hero {
    height: 50vh;
    min-height: 400px;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
  
  .header-container {
    padding: 0 var(--spacing-sm);
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .card {
    padding: var(--spacing-sm);
  }
  
  .text-block p {
    font-size: 1rem;
  }
}

@media (max-width: 320px) {
  :root {
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
  }
  
  .header-container {
    padding: 0 var(--spacing-xs);
    flex-wrap: wrap;
  }
  
  .container {
    padding: 0 var(--spacing-xs);
  }
  
  .section {
    padding: var(--spacing-md) 0;
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  h3 {
    font-size: 1.1rem;
  }
  
  h4 {
    font-size: 1rem;
  }
  
  .hero {
    height: 35vh;
    min-height: 250px;
  }
  
  .hero-content {
    padding: var(--spacing-sm);
  }
  
  .hero h1 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
  }
  
  .hero p {
    font-size: 0.875rem;
  }
  
  .card {
    padding: var(--spacing-sm);
  }
  
  .btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
    width: 100%;
    max-width: 200px;
  }
  
  .logo {
    font-size: 0.875rem;
    letter-spacing: 0.02em;
  }
  
  .back-to-top {
    bottom: 10px;
    right: 10px;
    width: 35px;
    height: 35px;
    font-size: 1rem;
  }
  
  .footer-grid {
    gap: var(--spacing-md);
  }
  
  .footer-section {
    font-size: 0.875rem;
  }
  
  .footer-section h3 {
    font-size: 1rem;
  }
  
  .process-steps {
    gap: var(--spacing-md);
  }
  
  .process-step {
    padding: var(--spacing-sm);
  }
  
  .process-step-number {
    width: 50px;
    height: 50px;
    font-size: 1.25rem;
  }
  
  .material-grid {
    gap: var(--spacing-sm);
  }
  
  .material-item {
    padding: var(--spacing-sm);
  }
  
  .text-block p {
    font-size: 0.9rem;
    line-height: 1.6;
  }
  
  .form-group input,
  .form-group textarea {
    font-size: 0.9rem;
    padding: var(--spacing-xs);
  }
  
  .form-group label {
    font-size: 0.875rem;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr !important;
    gap: var(--spacing-sm);
  }
  
  .image-full {
    margin: var(--spacing-sm) 0;
  }
  
  .card-image {
    height: 150px;
  }
}

@media print {
  header,
  footer,
  .back-to-top,
  .burger-menu {
    display: none;
  }
  
  body {
    background-color: #fff;
    color: #000;
  }
}