/* ============================================
   CONSTRUCTION COMPANY - MODERN CSS DESIGN
   ============================================ */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@600;700;800&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Color Palette - Construction Theme */
  --color-primary: #FF8C00;
  --color-primary-dark: #E67E00;
  --color-primary-light: #FFA726;
  --color-secondary: #2C3E50;
  --color-secondary-dark: #1A252F;
  --color-secondary-light: #34495E;
  
  --color-accent: #F39C12;
  --color-success: #27AE60;
  --color-danger: #E74C3C;
  
  --color-text-primary: #2C3E50;
  --color-text-secondary: #7F8C8D;
  --color-text-light: #FFFFFF;
  
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F8F9FA;
  --color-bg-dark: #2C3E50;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #FF8C00 0%, #F39C12 100%);
  --gradient-dark: linear-gradient(135deg, #2C3E50 0%, #34495E 100%);
  --gradient-overlay: linear-gradient(135deg, rgba(44, 62, 80, 0.9) 0%, rgba(255, 140, 0, 0.8) 100%);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1050;
  --z-tooltip: 1070;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-secondary);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* ============================================
   UTILITY CLASSES
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--spacing-md) auto 0;
  border-radius: var(--radius-full);
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-light);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  color: var(--color-text-light);
}

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

.btn-secondary:hover {
  background: var(--color-text-light);
  color: var(--color-primary);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-lg);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.logo {
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-overlay);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-text-light);
  max-width: 800px;
  padding: var(--spacing-2xl);
  animation: fadeInUp 1s ease-out;
}

.hero-title {
  font-size: var(--font-size-6xl);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.9);
  font-weight: 300;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services {
  background: var(--color-bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.service-card {
  background: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-2xl);
}

.service-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-md);
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-4xl);
  color: var(--color-text-light);
  box-shadow: var(--shadow-lg);
}

.service-card h3 {
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.service-card p {
  text-align: center;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  height: 350px;
}

.project-card:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-2xl);
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image {
  transform: scale(1.1);
}

.project-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-lg);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
  color: var(--color-text-light);
  transform: translateY(20px);
  opacity: 0;
  transition: all var(--transition-base);
}

.project-card:hover .project-overlay {
  transform: translateY(0);
  opacity: 1;
}

.project-overlay h3 {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.project-overlay p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
  background: var(--gradient-dark);
  color: var(--color-text-light);
}

.about .section-title {
  color: var(--color-text-light);
}

.about .section-title::after {
  background: var(--gradient-primary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.about-text h3 {
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-md);
}

.about-text p {
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.about-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-primary-light);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
  background: var(--color-bg-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.contact-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateX(5px);
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.contact-details h4 {
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-lg);
}

.contact-details p {
  color: var(--color-text-secondary);
  margin: 0;
}

.contact-form {
  background: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

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

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid #E0E0E0;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 140, 0, 0.1);
}

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

.form-group .btn {
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-lg);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-secondary-dark);
  color: var(--color-text-light);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-section h3 {
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.8;
}

.footer-section a:hover {
  color: var(--color-primary-light);
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--gradient-primary);
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* Scroll Reveal Animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  :root {
    --font-size-6xl: 2.5rem;
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--spacing-xl);
    transition: left var(--transition-base);
    box-shadow: var(--shadow-xl);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .services-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .project-card {
    height: 280px;
  }
}