:root {
  /* Brand Colors */
  --color-primary: #008f51;
  /* Sustainable Green */
  --color-primary-dark: #006b3c;
  --color-secondary: #005f9e;
  /* Industrial Blue */
  --color-secondary-dark: #004675;
  --color-accent: #8bc34a;
  /* Light Green for highlights */
  --color-text-main: #1a1a1a;
  --color-text-light: #555555;
  --color-background: #ffffff;
  --color-light-gray: #f4f6f8;
  --color-white: #ffffff;

  /* Typography */
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Roboto', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

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

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul {
  list-style: none;
}

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

/* Utilities */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

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

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

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

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

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

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

/* Header */
header {
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -1px;
}

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

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}

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

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

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

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

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  color: var(--color-white);
  padding-top: 80px;
  /* Offset fixed header */
  background-color: #000;
  /* Fallback */
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
  /* Dark overlay is handled by body color showing through opacity or distinct overlay div. 
     Here image opacity 0.6 on black bg gives the darkening effect. */
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
}

.badges {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(5px);
}

/* Stats Section */
.stats-section {
  background-color: var(--color-light-gray);
  padding: var(--spacing-lg) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  text-align: center;
}

.stat-card {
  background: var(--color-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s;
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  display: block;
}

.stat-desc {
  color: var(--color-text-light);
  font-size: 1rem;
}

/* Benefits Section */
.benefits-section {
  text-align: center;
}

.section-header {
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  font-size: 2.5rem;
  color: var(--color-secondary);
}

.section-header .subtitle {
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.benefit-item {
  padding: var(--spacing-md);
}

.benefit-icon {
  font-size: 3rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* Footer */
footer {
  background-color: #111;
  color: #aaa;
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-col h4 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

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

.footer-links a:hover {
  color: var(--color-white);
}

.copyright {
  border-top: 1px solid #333;
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    text-align: center;
    backdrop-filter: blur(10px);
  }

  .nav-links.active {
    display: flex;
    animation: slideDown 0.3s ease forwards;
  }

  .mobile-toggle {
    display: block;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

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

/* --- VISUAL ENHANCEMENTS & VFX --- */

/* 1. Global Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

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

/* 2. Hero Enhancements */
.hero {
  overflow: hidden;
  /* Ensure zoom doesn't break layout */
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  /* Deep back-up bg */
}

.hero-bg {
  transition: transform 0.5s ease-out;
  /* Smooth parallax feel */
  will-change: transform;
  animation: zoomInHero 20s infinite alternate;
  /* Subtle breathing effect */
}

@keyframes zoomInHero {
  0% {
    transform: scale(1);
  }

  100% {
    transform: scale(1.1);
  }
}

/* Glassmorphism Cards */
.stat-card,
.benefit-item,
.card-hover-effect {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
  border-radius: 12px;
}

.stat-card:hover,
.benefit-item:hover,
.card-hover-effect:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.1);
  border-color: var(--color-primary);
}

/* Button VFX */
.btn {
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.2);
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform 0.4s ease-out;
  z-index: -1;
}

.btn:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

/* Gradient Text for "Polypropylene & Polyethylene" */
.gradient-text {
  background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}

/* Scroll Progress Bar */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  transform-origin: 0 50%;
  transform: scaleX(0);
  z-index: 1001;
}

/* --- PRODUCT TABS & INTERACTION --- */
.tab-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.tab-btn {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  padding: 10px 30px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 30px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.tab-content {
  display: none;
  animation: fadeIn 0.5s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

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

.know-more-btn {
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.product-image-container {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease-out, opacity 0.5s ease;
  opacity: 0;
  margin-top: var(--spacing-sm);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}

.product-image-container.visible {
  max-height: 600px;
  /* Arbitrary large height */
  opacity: 1;
}

.sub-section {
  background: var(--color-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--color-secondary);
}

.sub-section h3 {
  color: var(--color-secondary);
  font-size: 1.8rem;
}