/* ===================================
   B2B Engineering Services - Design System
   Modern B2B Website with Grainger-Inspired Layout
   =================================== */

/* === CSS VARIABLES & DESIGN TOKENS === */
:root {
  /* Brand Colors */
  --primary-green: #31694E;
  --primary-light: #4A8B6F;
  --primary-dark: #1F4432;
  --accent-gold: #D4AF37;
  --accent-orange: #E67E22;

  /* Neutrals */
  --neutral-gray: #F8F9FA;
  --dark-gray: #2C3E50;
  --white: #FFFFFF;
  --success-green: #27AE60;
  --border-gray: #E0E0E0;
  --text-light: #6C757D;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #31694E 0%, #4A8B6F 100%);
  --gradient-overlay: linear-gradient(135deg, rgba(49, 105, 78, 0.9) 0%, rgba(49, 105, 78, 0.7) 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-accent: 'Poppins', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.2);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--dark-gray);
  background-color: var(--white);
  overflow-x: hidden;
}

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

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

ul,
ol {
  list-style: none;
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--dark-gray);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

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

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

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

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

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

.text-accent {
  font-family: var(--font-accent);
  font-weight: 600;
}

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

.container-wide {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-md);
}

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

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

.section-lg {
  padding: 5rem 0;
}

/* Enhanced Backgrounds */
.bg-pattern {
  background-color: #f8f9fa;
  background-image:
    linear-gradient(30deg, #31694E08 12%, transparent 12.5%, transparent 87%, #31694E08 87.5%, #31694E08),
    linear-gradient(150deg, #31694E08 12%, transparent 12.5%, transparent 87%, #31694E08 87.5%, #31694E08);
  background-size: 80px 140px;
}

.bg-accent {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.bg-gradient-subtle {
  background: linear-gradient(180deg, var(--white) 0%, #f8f9fa 100%);
}

.section-divider {
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--primary-green) 50%, transparent 100%);
  margin: 3rem 0;
  opacity: 0.2;
}


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

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

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

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

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-family: var(--font-accent);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-md);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-primary:hover {
  background: #BF9B2F;
}

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

.btn-secondary:hover {
  background: #D35400;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-green);
  color: var(--primary-green);
  box-shadow: none;
}

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

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

.btn-white:hover {
  background: var(--neutral-gray);
}

.btn-lg {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 0.625rem 1.5rem;
  font-size: 0.875rem;
}

/* === CARDS === */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

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

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-dark);
}

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

/* Glassmorphism Card */
.card-glass {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-lg);
}

/* Service Card */
.service-card {
  position: relative;
  height: 300px;
  background-size: cover;
  background-position: center;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
}

.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-overlay);
  transition: var(--transition-normal);
}

.service-card:hover::before {
  background: linear-gradient(135deg, rgba(49, 105, 78, 0.7) 0%, rgba(49, 105, 78, 0.5) 100%);
}

.service-card-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--spacing-lg);
  color: var(--white);
}

.service-card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.service-card-title {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: var(--spacing-xs);
}

.service-card-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.9);
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-normal);
}

.service-card:hover .service-card-desc {
  opacity: 1;
  transform: translateY(0);
}

/* Product Card */
.product-card {
  background: var(--white);
  border: 1px solid var(--border-gray);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.product-card:hover {
  border-color: var(--primary-green);
  box-shadow: var(--shadow-lg);
}

.product-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--neutral-gray);
}

.product-card-body {
  padding: var(--spacing-md);
}

.product-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--primary-light);
  color: var(--white);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  font-weight: 600;
}

.product-title {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
  color: var(--dark-gray);
}

.product-desc {
  font-size: 0.875rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

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

.form-control {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-primary);
  font-size: 1rem;
  border: 2px solid var(--border-gray);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  background: var(--white);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(49, 105, 78, 0.1);
}

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

select.form-control {
  cursor: pointer;
}

.form-error {
  color: #E74C3C;
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: none;
}

.form-control.error {
  border-color: #E74C3C;
}

.form-control.error+.form-error {
  display: block;
}

/* === BADGES === */
.badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--primary-green);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  white-space: nowrap;
}

.badge-gold {
  background: var(--accent-gold);
}

.badge-success {
  background: var(--success-green);
}

.badge-outline {
  background: transparent;
  border: 2px solid var(--primary-green);
  color: var(--primary-green);
}

/* === HEADER === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

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

.logo {
  height: 60px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: 500;
  color: var(--dark-gray);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-green);
  transition: var(--transition-fast);
}

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

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

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

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 28px;
  height: 3px;
  background: var(--primary-green);
  transition: var(--transition-fast);
}

/* === 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;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  /* Middle transparency effect: sides are clear, middle has a subtle dark overlay for text readability */
  background: linear-gradient(to right,
      rgba(0, 0, 0, 0) 0%,
      rgba(0, 0, 0, 0) 20%,
      rgba(0, 0, 0, 0.4) 35%,
      rgba(0, 0, 0, 0.4) 65%,
      rgba(0, 0, 0, 0) 80%,
      rgba(0, 0, 0, 0) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  max-width: 800px;
  padding: var(--spacing-xl);
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-xl);
  line-height: 1.4;
}

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

.trust-badges {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  flex-wrap: wrap;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 600;
}

.trust-badge-icon {
  font-size: 1.5rem;
  color: var(--accent-gold);
}

/* === SECTION TITLES === */
.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title h2 {
  position: relative;
  display: inline-block;
  padding-bottom: var(--spacing-sm);
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--text-light);
  margin-top: var(--spacing-sm);
  font-size: 1.125rem;
}

/* === STATISTICS SECTION === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.stat-card {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 800;
  font-family: var(--font-accent);
  margin-bottom: var(--spacing-xs);
  color: var(--accent-gold);
}

.stat-label {
  font-size: 1.125rem;
  font-weight: 600;
  opacity: 0.95;
}

/* === FOOTER === */
.footer {
  background: var(--dark-gray);
  color: var(--white);
  padding-top: var(--spacing-xxl);
}

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

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

.footer-link {
  display: block;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-sm);
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-gold);
  transform: translateX(5px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-lg) 0;
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
}

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

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  font-size: 1.25rem;
  transition: var(--transition-fast);
}

.social-link:hover {
  background: var(--accent-gold);
  transform: scale(1.1);
}

/* === ANIMATIONS === */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

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

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

.slide-in-up {
  animation: slideInUp 0.6s ease-out;
}

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

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

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* === FLOATING WHATSAPP BUTTON === */
.whatsapp-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  width: 60px;
  height: 60px;
  background: #25D366;
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-normal);
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-hover);
}

/* === RESPONSIVE BREAKPOINTS === */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--white);
    flex-direction: column;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
  }

  .nav.active {
    left: 0;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

/* === UTILITIES === */
.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}

.mb-4 {
  margin-bottom: var(--spacing-xl);
}

.mt-0 {
  margin-top: 0;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

.mt-4 {
  margin-top: var(--spacing-xl);
}

.p-0 {
  padding: 0;
}

.p-1 {
  padding: var(--spacing-sm);
}

.p-2 {
  padding: var(--spacing-md);
}

.p-3 {
  padding: var(--spacing-lg);
}

.p-4 {
  padding: var(--spacing-xl);
}

.text-white {
  color: var(--white);
}

.text-primary {
  color: var(--primary-green);
}

.text-gold {
  color: var(--accent-gold);
}

.bg-primary {
  background: var(--primary-green);
}

.bg-gray {
  background: var(--neutral-gray);
}

.bg-white {
  background: var(--white);
}

.w-100 {
  width: 100%;
}

.h-100 {
  height: 100%;
}