@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

/* ==========================================================================
   SAI REFRIGERATION — DESIGN SYSTEM & TOKENS
   Single Source of Truth: design-brand_ui_design_system.md
   Colors: Primary Blue #0000FE | Secondary Red #FE0000 | Navy #0A0F2C
   WhatsApp Brand: Green #25D366 | Dark Green #128C7E
   ========================================================================== */

:root {
  /* Brand Colors */
  --brand-blue: #0000FE;
  --brand-blue-hover: #0000D6;
  --brand-blue-dark: #0000B3;
  --brand-blue-light: #EBF0FF;
  
  /* Secondary Brand Red */
  --brand-red: #FE0000;
  --brand-red-hover: #D60000;
  --brand-red-light: #FFF0F0;

  /* WhatsApp Brand Colors */
  --whatsapp-green: #25D366;
  --whatsapp-green-hover: #1EBE5D;
  --whatsapp-dark: #128C7E;
  --whatsapp-deep: #075E54;
  --whatsapp-light: #DCF8C6;
  
  /* Neutral / Structure Colors */
  --dark-navy: #0A0F2C;
  --dark-navy-surface: #10173D;
  --dark-navy-card: #121A45;
  --dark-navy-border: #1E2856;
  --text-dark: #1A1A1A;
  --text-medium: #555555;
  --text-muted: #777777;
  --light-gray: #F3F4F8;
  --border-light: #E2E4EB;
  --white: #FFFFFF;

  /* Typography */
  --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Radius */
  --radius-button: 8px;
  --radius-card: 12px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-card: 0 8px 30px rgba(10, 15, 44, 0.08);
  --shadow-hover: 0 14px 40px rgba(10, 15, 44, 0.12);
  --shadow-nav: 0 4px 20px rgba(10, 15, 44, 0.06);
  --shadow-nav-scrolled: 0 6px 24px rgba(10, 15, 44, 0.08);
}

/* Base resets & typography */
html {
  font-family: var(--font-primary);
  color: var(--text-dark);
  background-color: var(--white);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  font-family: var(--font-primary);
  color: var(--text-dark);
  line-height: 1.65;
}

/* Header & Navigation */
.site-header {
  transition: background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, padding 0.3s ease;
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-nav-scrolled);
  border-bottom: 1px solid var(--border-light);
  padding-top: 0.65rem;
  padding-bottom: 0.65rem;
}

/* Navigation Links: Hover uses Secondary Brand Red #FE0000 */
.nav-link {
  position: relative;
  font-weight: 600;
  color: var(--text-dark);
  transition: color 0.25s ease;
  padding: 0.25rem 0;
}

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

.nav-link.active {
  color: var(--brand-blue);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--brand-red);
  border-radius: 2px;
  transition: width 0.25s ease, background-color 0.25s ease;
}

.nav-link:hover::after {
  width: 100%;
  background-color: var(--brand-red);
}

.nav-link.active::after {
  width: 100%;
  background-color: var(--brand-blue);
}

/* Mobile Nav Links */
.mobile-nav-link {
  transition: color 0.2s ease, transform 0.2s ease;
}
.mobile-nav-link:hover {
  color: var(--brand-red) !important;
  transform: translateX(4px);
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--brand-blue);
  color: var(--white);
  font-weight: 600;
  font-size: 0.925rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-button);
  border: 1.5px solid var(--brand-blue);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 14px rgba(0, 0, 254, 0.2);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary:hover {
  background-color: var(--brand-red);
  border-color: var(--brand-red);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(254, 0, 0, 0.3);
}

.btn-primary .btn-icon {
  transition: transform 0.2s ease;
}

.btn-primary:hover .btn-icon {
  transform: translateX(4px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--white);
  color: var(--text-dark);
  font-weight: 600;
  font-size: 0.925rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-button);
  border: 1.5px solid var(--border-light);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.btn-secondary:hover {
  border-color: var(--brand-red);
  color: var(--brand-red);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(254, 0, 0, 0.12);
}

.btn-secondary .btn-icon-red {
  color: var(--brand-red);
  transition: transform 0.2s ease;
}

.btn-secondary:hover .btn-icon-red {
  transform: translateX(4px);
}

.btn-text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--brand-blue);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.btn-text-link:hover {
  color: var(--brand-red);
}

.btn-text-link .link-arrow {
  color: var(--brand-red);
  transition: transform 0.2s ease;
}

.btn-text-link:hover .link-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   HERO SECTION STYLING (MATCHING EXACT COMPOSITION MOCKUP)
   ========================================================================== */

.hero-wrapper {
  position: relative;
  background-color: #f8fafc;
  min-height: 720px;
}

/* Bottom HVAC Capabilities Ribbon */
.hero-bottom-strip {
  background: linear-gradient(90deg, #0000FE 0%, #00188F 60%, #0A0F2C 100%);
}

.hero-strip-item {
  position: relative;
  transition: all 0.25s ease;
}

.hero-strip-item:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.hero-strip-item:hover .strip-icon {
  color: #FFFFFF;
  transform: scale(1.1);
}

.hero-strip-red-wedge {
  clip-path: polygon(35% 0, 100% 0, 100% 100%, 0% 100%);
  background-color: var(--brand-red);
}

/* ==========================================================================
   CAPABILITY CARDS
   ========================================================================== */

.capability-card {
  position: relative;
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: transparent;
  border-top-left-radius: var(--radius-card);
  border-top-right-radius: var(--radius-card);
  transition: background-color 0.3s ease;
}

.capability-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(254, 0, 0, 0.3);
}

.capability-card:hover::before {
  background-color: var(--brand-red);
}

.capability-card .icon-box {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  background-color: var(--brand-blue-light);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.capability-card:hover .icon-box {
  background-color: var(--brand-red);
  color: var(--white);
  transform: scale(1.05);
}

.capability-card .num-badge {
  font-size: 1.75rem; /* 28px on mobile/tablet */
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--brand-blue);
  opacity: 0.85;
  transition: all 0.25s ease;
  font-feature-settings: "tnum";
}

@media (min-width: 1024px) {
  .capability-card .num-badge {
    font-size: 2.125rem; /* 34px on desktop */
  }
}

.capability-card:hover .num-badge {
  color: var(--brand-red);
  opacity: 1;
  transform: scale(1.05);
}

/* ==========================================================================
   SERVICE CARDS (CORE HVAC SERVICES)
   ========================================================================== */

.service-card {
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-card);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(254, 0, 0, 0.3);
}

.service-card .service-img-box {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--light-gray);
}

.service-card .service-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.service-card:hover .service-img-box img {
  transform: scale(1.06);
}

.service-card .service-icon-badge {
  position: absolute;
  bottom: 12px;
  left: 14px;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background-color: var(--brand-blue);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 254, 0.25);
  transition: all 0.3s ease;
}

.service-card:hover .service-icon-badge {
  background-color: var(--brand-red);
  box-shadow: 0 4px 12px rgba(254, 0, 0, 0.35);
  transform: scale(1.08);
}

.service-card .service-number {
  color: var(--brand-blue);
  transition: color 0.25s ease;
}

.service-card:hover .service-number {
  color: var(--brand-red);
}

/* ==========================================================================
   SPECIALIZED SOLUTIONS CARDS (DARK / NAVY THEMED)
   ========================================================================== */

.specialized-card {
  background-color: var(--dark-navy-card);
  border: 1px solid var(--dark-navy-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.specialized-card:hover {
  transform: translateY(-5px);
  border-color: rgba(254, 0, 0, 0.5);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.specialized-card .spec-img-box {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--dark-navy-surface);
}

.specialized-card .spec-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.specialized-card:hover .spec-img-box img {
  transform: scale(1.06);
}

.specialized-card .spec-icon-badge {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background-color: rgba(0, 0, 254, 0.2);
  border: 1px solid rgba(0, 0, 254, 0.4);
  color: #8da4ff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.specialized-card:hover .spec-icon-badge {
  background-color: var(--brand-red);
  border-color: var(--brand-red);
  color: var(--white);
  transform: scale(1.08);
}

/* ==========================================================================
   WHY SAI REFRIGERATION (5 FEATURES)
   ========================================================================== */

.why-feature-item {
  position: relative;
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
  transition: all 0.25s ease;
}

.why-feature-item:hover {
  border-color: rgba(254, 0, 0, 0.3);
  box-shadow: 0 8px 24px rgba(10, 15, 44, 0.06);
  transform: translateX(4px);
}

.why-feature-item .feature-badge {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background-color: var(--brand-blue-light);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.75rem;
  transition: all 0.25s ease;
  shrink-0: 0;
}

.why-feature-item:hover .feature-badge {
  background-color: var(--brand-red);
  color: var(--white);
}

/* ==========================================================================
   7. PROJECT EXECUTION PROCESS
   ========================================================================== */

.process-card {
  position: relative;
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 2rem 1.5rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.process-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(254, 0, 0, 0.3);
}

.process-card .process-num-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-blue);
  background-color: var(--brand-blue-light);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  transition: all 0.25s ease;
}

.process-card:hover .process-num-pill {
  background-color: var(--brand-red);
  color: var(--white);
}

.process-card .process-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background-color: var(--brand-blue-light);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  margin-bottom: 1.25rem;
}

.process-card:hover .process-icon-box {
  background-color: var(--brand-blue);
  color: var(--white);
  transform: scale(1.06);
}

/* ==========================================================================
   8. PROJECTS & EXPERIENCE
   ========================================================================== */

/* ==========================================================================
   8. PROJECTS & EXPERIENCE — THUMBNAIL SLIDER & LIGHTBOX
   ========================================================================== */

.project-slider-wrapper {
  position: relative;
  width: 100%;
}

.project-slider-container {
  display: flex;
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE and Edge */
  padding: 1.25rem 0.25rem;
  gap: 1.25rem;
}

.project-slider-container::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.project-slide-item {
  flex: 0 0 calc(55% - 0.6rem); /* ~1.8 cards on small mobile */
  scroll-snap-align: start;
}

@media (min-width: 480px) {
  .project-slide-item {
    flex: 0 0 calc(45% - 0.75rem); /* ~2.2 cards on mobile */
  }
}

@media (min-width: 640px) {
  .project-slide-item {
    flex: 0 0 calc(33.333% - 0.85rem); /* 3 cards on small tablet */
  }
}

@media (min-width: 1024px) {
  .project-slide-item {
    flex: 0 0 calc(25% - 1rem); /* 4 cards on desktop */
  }
}

@media (min-width: 1280px) {
  .project-slide-item {
    flex: 0 0 calc(20% - 1rem); /* 5 cards on large desktop */
  }
}

.project-thumb-card {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--white);
  border: 2px solid var(--border-light);
  box-shadow: 0 6px 18px rgba(10, 15, 44, 0.07);
  cursor: pointer;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-thumb-card:hover {
  transform: translateY(-6px);
  border-color: var(--brand-blue);
  box-shadow: 0 16px 32px rgba(10, 15, 44, 0.15);
}

.project-thumb-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.5s ease;
}

.project-thumb-card:hover img {
  transform: scale(1.08);
}

.project-thumb-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 15, 44, 0.8) 0%, rgba(10, 15, 44, 0.2) 60%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1rem;
}

.project-thumb-card:hover .project-thumb-overlay {
  opacity: 1;
}

.project-thumb-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--white);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transform: scale(0.85);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-thumb-card:hover .project-thumb-badge {
  transform: scale(1);
  opacity: 1;
}

/* Lightbox Navigation Buttons */
.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--dark-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
  z-index: 30;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.lightbox-nav-btn:hover {
  background-color: var(--brand-red);
  color: var(--white);
  transform: translateY(-50%) scale(1.1);
}

.lightbox-nav-btn:active {
  transform: translateY(-50%) scale(0.95);
}

.lightbox-nav-btn.prev-btn {
  left: 1rem;
}

.lightbox-nav-btn.next-btn {
  right: 1rem;
}

@media (max-width: 640px) {
  .lightbox-nav-btn {
    width: 38px;
    height: 38px;
  }
  .lightbox-nav-btn.prev-btn {
    left: 0.5rem;
  }
  .lightbox-nav-btn.next-btn {
    right: 0.5rem;
  }
}

/* ==========================================================================
   9. SUCCESSFUL VENDORSHIP — CLIENT LOGO SLIDER
   ========================================================================== */

.client-slider-wrapper {
  position: relative;
  width: 100%;
}

.client-slider-container {
  display: flex;
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE and Edge */
  padding: 1rem 0;
  gap: 1rem;
}

.client-slider-container::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.client-slide-item {
  flex: 0 0 calc(50% - 0.6rem); /* 2 cards on mobile */
  scroll-snap-align: start;
}

@media (min-width: 640px) {
  .client-slide-item {
    flex: 0 0 calc(33.333% - 0.75rem); /* 3 cards on small tablet */
  }
}

@media (min-width: 768px) {
  .client-slide-item {
    flex: 0 0 calc(28% - 0.8rem); /* ~3.5 cards on tablet */
  }
}

@media (min-width: 1024px) {
  .client-slide-item {
    flex: 0 0 calc(22% - 0.85rem); /* ~4.5 cards on desktop */
  }
}

@media (min-width: 1280px) {
  .client-slide-item {
    flex: 0 0 calc(18% - 0.9rem); /* ~5.5 cards on large desktop */
  }
}

.vendor-card {
  position: relative;
  background-color: var(--white);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 135px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 14px rgba(10, 15, 44, 0.05);
}

.vendor-card:hover {
  transform: translateY(-5px);
  border-color: var(--brand-blue);
  box-shadow: 0 10px 25px rgba(10, 15, 44, 0.1);
}

.vendor-card .vendor-logo-box {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vendor-card .vendor-logo-box img {
  max-height: 95px;
  max-width: 90%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: none;
  opacity: 1;
  transition: transform 0.3s ease;
}

.vendor-card:hover .vendor-logo-box img {
  transform: scale(1.08);
}

/* Slider Navigation Buttons */
.slider-nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--white);
  border: 1.5px solid var(--border-light);
  color: var(--dark-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 12px rgba(10, 15, 44, 0.08);
  cursor: pointer;
  z-index: 10;
}

.slider-nav-btn:hover {
  background-color: var(--brand-red);
  border-color: var(--brand-red);
  color: var(--white);
  transform: scale(1.08);
  box-shadow: 0 6px 18px rgba(254, 0, 0, 0.3);
}

.slider-nav-btn:active {
  transform: scale(0.96);
}

.vendor-card:hover .vendor-name-fallback {
  color: var(--brand-blue);
}

.vendor-card .vendor-subtext {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ==========================================================================
   10. CONTACT SECTION & WHATSAPP ENQUIRY FORM (WHATSAPP BRANDED)
   ========================================================================== */

.contact-section-bg {
  background-color: var(--dark-navy);
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 36px 36px;
}

.contact-info-card {
  background-color: var(--dark-navy-card);
  border: 1px solid var(--dark-navy-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  transition: all 0.25s ease;
}

.contact-info-card:hover {
  border-color: rgba(37, 211, 102, 0.5);
  transform: translateY(-2px);
}

.contact-icon-pill {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background-color: rgba(37, 211, 102, 0.15);
  border: 1px solid rgba(37, 211, 102, 0.35);
  color: var(--whatsapp-green);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.25s ease;
}

.contact-info-card:hover .contact-icon-pill {
  background-color: var(--whatsapp-green);
  border-color: var(--whatsapp-green);
  color: var(--white);
}

/* WhatsApp Branded Form Container */
.whatsapp-form-panel {
  background-color: #0F183D;
  border: 1.5px solid rgba(37, 211, 102, 0.3);
  border-radius: 16px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45), 0 0 30px rgba(37, 211, 102, 0.08);
  position: relative;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.whatsapp-form-panel:hover {
  border-color: rgba(37, 211, 102, 0.5);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.5), 0 0 35px rgba(37, 211, 102, 0.14);
}

.whatsapp-icon-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--whatsapp-green);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.4);
  flex-shrink: 0;
}

/* Form Inputs (WhatsApp Themed Focus) */
.form-input-container {
  position: relative;
}

.form-input {
  width: 100%;
  background-color: #FFFFFF;
  border: 1.5px solid var(--border-light);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-family: var(--font-primary);
  font-size: 0.9rem;
  color: var(--text-dark);
  transition: all 0.2s ease;
  outline: none;
}

.form-input:focus {
  border-color: var(--whatsapp-green);
  box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.25);
}

.form-input.is-invalid {
  border-color: #FF4D4D;
  background-color: #FFF5F5;
}

.form-input.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(255, 77, 77, 0.25);
}

.form-label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: #E2E8F0;
  margin-bottom: 0.35rem;
}

.form-label .required-star {
  color: var(--whatsapp-green);
  margin-left: 2px;
}

.form-error-msg {
  font-size: 0.75rem;
  color: #FFA3A3;
  margin-top: 0.3rem;
  display: none;
  font-weight: 500;
}

.form-input.is-invalid ~ .form-error-msg {
  display: block;
}

/* WhatsApp Branded Submit Button (Official Green #25D366) */
.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  width: 100%;
  background-color: var(--whatsapp-green);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.9rem 1.5rem;
  border-radius: var(--radius-button);
  border: 1.5px solid var(--whatsapp-green);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);
  cursor: pointer;
}

.btn-whatsapp:hover:not(:disabled) {
  background-color: var(--whatsapp-green-hover);
  border-color: var(--whatsapp-green-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 211, 102, 0.45);
}

.btn-whatsapp:active:not(:disabled) {
  transform: translateY(0);
}

.btn-whatsapp:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

.btn-whatsapp .wa-icon {
  width: 22px;
  height: 22px;
  fill: currentColor;
  transition: transform 0.2s ease;
}

.btn-whatsapp:hover:not(:disabled) .wa-icon {
  transform: scale(1.1);
}

.btn-whatsapp .btn-icon-arrow {
  transition: transform 0.2s ease;
}

.btn-whatsapp:hover:not(:disabled) .btn-icon-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   11. FOOTER
   ========================================================================= */

.site-footer {
  background-color: #070B22;
  color: #94A3B8;
  border-top: 1px solid var(--dark-navy-border);
}

.footer-link {
  color: #CBD5E1;
  font-size: 0.85rem;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
  text-decoration: none;
}

.footer-link:hover {
  color: var(--brand-red);
  transform: translateX(3px);
}

.footer-accent-bar {
  height: 3px;
  background: linear-gradient(90deg, #0000FE 0%, #FE0000 35%, #0000FE 100%);
}

/* ==========================================================================
   GENERIC IMAGE PLACEHOLDER SYSTEM
   ========================================================================= */

.hvac-placeholder-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f3f4f8 0%, #e5e7eb 100%);
  color: #64748b;
  padding: 1.5rem;
  text-align: center;
}

.hvac-placeholder-dark {
  background: linear-gradient(135deg, #10173d 0%, #0a0f2c 100%);
  color: #94a3b8;
  border: 1px dashed rgba(255, 255, 255, 0.15);
}

.hvac-placeholder-container .ph-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background-color: rgba(0, 0, 254, 0.08);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.hvac-placeholder-dark .ph-icon {
  background-color: rgba(255, 255, 255, 0.08);
  color: #93c5fd;
}

/* Technical Image Container */
.technical-img-container {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(10, 15, 44, 0.1);
  border: 1px solid var(--border-light);
}

/* Feature Item in About */
.about-feature-item {
  transition: all 0.25s ease;
}

.about-feature-item:hover {
  border-color: rgba(254, 0, 0, 0.3);
  transform: translateX(4px);
}

.about-feature-item:hover .feature-bullet {
  background-color: var(--brand-red);
}

/* Blueprint / Engineering Grid Pattern Background */
.bg-engineering-grid {
  background-size: 32px 32px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
}

/* Reveal Animations */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-100 { transition-delay: 100ms; }
.reveal-delay-200 { transition-delay: 200ms; }
.reveal-delay-300 { transition-delay: 300ms; }
.reveal-delay-400 { transition-delay: 400ms; }
.reveal-delay-500 { transition-delay: 500ms; }

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}