/* -------------------------------------------------------------------------- */
/*                               CSS VARIABLES                                */
/* -------------------------------------------------------------------------- */
:root {
  --primary: #1F2937; /* Deep Navy/Charcoal */
  --secondary: #F97316; /* Action Orange */
  --secondary-hover: #EA580C;
  --bg-color: #F3F4F6; /* Light Grey Background */
  --text-main: #374151; /* Dark Grey Text */
  --text-light: #6B7280;
  --white: #FFFFFF;
  --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);
  --transition: all 0.3s ease;
  --font-main: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius: 8px;
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* -------------------------------------------------------------------------- */
/*                                 TYPOGRAPHY                                 */
/* -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; position: relative; display: inline-block;}
h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 50px;
  height: 3px;
  background-color: var(--secondary);
}
.text-center h2::after {
  left: 50%;
  transform: translateX(-50%);
}
h3 { font-size: 1.5rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-light);
}

/* -------------------------------------------------------------------------- */
/*                                  UTILITIES                                 */
/* -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-padding {
  padding: 80px 0;
}

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

.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--secondary);
  color: var(--white);
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.9rem;
}

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

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

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

.bg-white { background-color: var(--white); }
.bg-light { background-color: #F9FAFB; }
.bg-primary { background-color: var(--primary); color: var(--white); }
.bg-primary h2, .bg-primary p { color: var(--white); }

/* -------------------------------------------------------------------------- */
/*                                   HEADER                                   */
/* -------------------------------------------------------------------------- */
.top-bar {
  background-color: var(--primary);
  color: var(--white);
  padding: 8px 0;
  font-size: 0.9rem;
}

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

.top-bar a {
  color: var(--white);
  transition: var(--transition);
}

.top-bar a:hover {
  color: var(--secondary);
}

header {
  background-color: var(--white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

header.scrolled {
  padding: 5px 0;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo h1 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--primary);
}

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

/* Nav Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition);
  padding: 10px 0;
  display: block;
}

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

/* Dropdown */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--white);
  min-width: 250px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  border-radius: var(--radius);
  z-index: 1001;
  padding: 10px 0;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  padding: 10px 20px;
  display: block;
  color: var(--text-main);
  transition: var(--transition);
  border-bottom: 1px solid #F3F4F6;
}
.dropdown-item:last-child {
  border-bottom: none;
}

.dropdown-item:hover {
  background-color: #F9FAFB;
  color: var(--secondary);
  padding-left: 25px;
}

/* Hamburger Menu */
.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--primary);
}

/* -------------------------------------------------------------------------- */
/*                                HERO SECTION                                */
/* -------------------------------------------------------------------------- */
.hero {
  position: relative;
  background-color: var(--primary);
  color: var(--white);
  padding: 120px 0;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: url('https://via.placeholder.com/1920x1080/1F2937/FFFFFF?text=Precast+Wall+Installation+Site');
  background-size: cover;
  background-position: center;
  opacity: 0.3;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: var(--white);
  font-size: 3rem;
  margin-bottom: 20px;
  animation: fadeInDown 1s ease;
}

.hero p {
  color: #E5E7EB;
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 30px;
  animation: fadeInUp 1s ease 0.3s forwards;
  opacity: 0;
}

.hero-btns {
  display: flex;
  gap: 15px;
  justify-content: center;
  animation: fadeInUp 1s ease 0.6s forwards;
  opacity: 0;
}

/* -------------------------------------------------------------------------- */
/*                               GRID LAYOUTS                                 */
/* -------------------------------------------------------------------------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* -------------------------------------------------------------------------- */
/*                                  CARDS                                     */
/* -------------------------------------------------------------------------- */
.service-card {
  background-color: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  height: 100%;
}

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

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

.service-content {
  padding: 25px;
}

.service-content h3 {
  margin-bottom: 15px;
  font-size: 1.25rem;
}

/* -------------------------------------------------------------------------- */
/*                                 FEATURES                                   */
/* -------------------------------------------------------------------------- */
.feature-item {
  text-align: center;
  padding: 30px 20px;
  background-color: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--secondary);
  margin-bottom: 15px;
}

/* -------------------------------------------------------------------------- */
/*                                  GALLERY                                   */
/* -------------------------------------------------------------------------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(31, 41, 55, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: var(--transition);
}

.gallery-overlay h4 {
  color: var(--white);
  margin-bottom: 5px;
  transform: translateY(20px);
  transition: var(--transition);
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-item:hover .gallery-overlay h4 {
  transform: translateY(0);
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 9999;
  display: none;
  justify-content: center;
  align-items: center;
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  position: relative;
  max-width: 90%;
  max-height: 90vh;
}

.lightbox-img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  color: var(--white);
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
}

/* -------------------------------------------------------------------------- */
/*                                CONTACT FORM                                */
/* -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: 20px;
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #D1D5DB;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.2);
}

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

/* -------------------------------------------------------------------------- */
/*                                  FOOTER                                    */
/* -------------------------------------------------------------------------- */
footer {
  background-color: var(--primary);
  color: var(--white);
  padding: 60px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--white);
  margin-bottom: 20px;
  font-size: 1.2rem;
  position: relative;
  display: inline-block;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  left: 0; bottom: -5px;
  width: 30px; height: 2px;
  background-color: var(--secondary);
}

.footer-col p, .footer-col ul li a {
  color: #9CA3AF;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a:hover {
  color: var(--secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #9CA3AF;
  font-size: 0.9rem;
}

/* -------------------------------------------------------------------------- */
/*                                FLOATING BTNS                               */
/* -------------------------------------------------------------------------- */
.floating-whatsapp {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  background-color: #25D366;
  color: white;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 30px;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: var(--transition);
}

.floating-whatsapp:hover {
  transform: scale(1.1);
}

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

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

/* -------------------------------------------------------------------------- */
/*                                MEDIA QUERIES                               */
/* -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  /* Navbar */
  .hamburger { display: block; }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: -100%;
    width: 100%;
    background-color: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    box-shadow: var(--shadow-md);
    transition: 0.4s ease;
    gap: 15px;
  }

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

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    min-width: 100%;
    padding-left: 15px;
    display: none;
  }
  
  .dropdown.active .dropdown-menu {
    display: block;
  }

  /* Grids */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  
  .hero h1 { font-size: 2rem; }
  .section-padding { padding: 50px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  
  .top-bar { text-align: center; }
  .top-bar .container { flex-direction: column; gap: 5px; }
}