/* Modern Layered Scrolling Website CSS */

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--background);
  overflow-x: hidden;
}

/* CSS Custom Properties (Variables) */
:root {
  /* Modern Professional Color Palette */
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --accent-color: #0ea5e9;
  --secondary-color: #10b981;
  --tertiary-color: #f59e0b;
  --danger-color: #ef4444;
  
  /* Modern Gradients */
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
  --gradient-accent: linear-gradient(135deg, #0ea5e9 0%, #10b981 100%);
  --gradient-hero: linear-gradient(135deg, #2563eb 0%, #0ea5e9 50%, #10b981 100%);
  --gradient-technologies: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  --gradient-services: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --gradient-testimonials: linear-gradient(135deg, #fef3c7 0%, #fbbf24 100%);
  --gradient-contact: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
  --gradient-footer: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  
  /* Text Colors */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #ffffff;
  --text-accent: #2563eb;
  
  /* Background Colors */
  --background: #ffffff;
  --background-secondary: #f8fafc;
  --background-accent: #f1f5f9;
  --background-dark: #0f172a;
  
  /* Border and UI Colors */
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --shadow-hover: rgba(0, 0, 0, 0.12);
  --shadow-strong: rgba(0, 0, 0, 0.16);
  
  /* Professional Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Modern Typography */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 800;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --border-radius-lg: 1rem;
  
  /* Smooth Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Layer System */
.layer {
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.layer-hidden {
  display: none;
}

.layer-content {
  max-width: 1200px;
  width: 100%;
  padding: var(--spacing-xl);
  margin: 0 auto;
  text-align: center;
  z-index: 1;
  position: relative;
}

/* Navigation Layer */
.navigation {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo h2 {
  color: var(--primary-color);
  font-weight: var(--font-weight-bold);
  font-size: 1.5rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-normal);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-normal);
}

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

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

.nav-link.active::after {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-normal);
}

.nav-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active .hamburger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.active .hamburger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Home Layer */
.home-layer {
  background: var(--gradient-hero);
  color: var(--text-light);
}

.home-layer .layer-title {
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
}

.home-layer .layer-subtitle {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

.home-layer .layer-description {
  font-size: clamp(1rem, 2vw, 1.125rem);
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
  line-height: 1.7;
  opacity: 0.8;
}

/* Technologies Layer */
.technologies-layer {
  background: var(--gradient-technologies);
  color: var(--text-light);
  min-height: 50vh;
}

.technologies-layer .layer-title {
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
}

.tech-carousel {
  margin-top: var(--spacing-3xl);
  position: relative;
  overflow: hidden;
  width: 100%;
}

.tech-track {
  display: flex;
  gap: var(--spacing-xl);
  animation: marquee 30s linear infinite;
  width: fit-content;
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-normal);
  cursor: pointer;
  flex-shrink: 0;
  white-space: nowrap;
}

.tech-item:hover {
  animation-play-state: paused;
  transform: scale(1.05);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.tech-item img {
  width: 48px;
  height: 48px;
  filter: brightness(0) invert(1);
}

.tech-item span {
  font-weight: var(--font-weight-medium);
  font-size: 0.875rem;
}

@keyframes pulse {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.1);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}


@keyframes marquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* Services Layer */
.services-layer {
  background: var(--gradient-services);
  color: var(--text-primary);
}


.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.service-card {
  background: var(--background);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: left;
  transition: all var(--transition-normal);
  height: 100%;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

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

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  border-color: var(--primary-color);
}

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

.service-card {
  display: flex;
  flex-direction: column;
}

.service-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.service-icon {
  width: 56px;
  height: 56px;
  margin-right: var(--spacing-md);
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.2);
  transition: all var(--transition-normal);
}

.service-card:hover .service-icon {
  transform: scale(1.1);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.3);
}

.service-icon img {
  width: 40px;
  height: 40px;
  filter: brightness(0) invert(1);
}

.service-category {
  font-size: 1.375rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
}

.service-description {
  color: var(--text-primary);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.tech-list {
  list-style: none;
}

.tech-list li {
  padding: var(--spacing-sm) 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  position: relative;
  padding-left: var(--spacing-lg);
}

.tech-list li::before {
  content: '*';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: var(--font-weight-bold);
}

/* Testimonials Layer */
.testimonials-layer {
  background: var(--gradient-testimonials);
  color: var(--text-primary);
}


.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.testimonial-card {
  background: var(--background);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: left;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.testimonial-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-info h4 {
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xs);
}

.testimonial-info p {
  color: var(--text-primary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.stars {
  color: var(--tertiary-color);
  font-size: 1rem;
}

.testimonial-text {
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.6;
}

.testimonial-text p {
  position: relative;
  padding-left: var(--spacing-lg);
}

.testimonial-text p::before {
  content: '"';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-size: 2rem;
  line-height: 1;
}

/* Contact Layer */
.contact-layer {
  background: linear-gradient(135deg, #2d3748 0%, #4a5568 50%, #718096 100%);
  color: var(--text-light);
  position: relative;
  overflow: hidden;
}

.contact-layer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.03) 0%, transparent 50%),
              radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.02) 0%, transparent 50%);
  pointer-events: none;
}

.contact-layer .layer-title {
  color: #ffffff;
  margin-bottom: var(--spacing-lg);
  font-weight: var(--font-weight-bold);
}

.contact-layer .layer-subtitle {
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-lg);
  font-weight: var(--font-weight-medium);
}

.contact-layer .layer-description {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.25rem;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto var(--spacing-2xl);
  text-align: center;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.contact-item {
  text-align: center;
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: all var(--transition-normal);
}

.contact-item:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.contact-item h3 {
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.contact-item p,
.contact-item address {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.125rem;
  line-height: 1.6;
  margin: 0;
}

.contact-link {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  transition: all var(--transition-normal);
  font-weight: var(--font-weight-medium);
}

.contact-link:hover {
  color: #ffffff;
  text-decoration: underline;
}

.contact-layer .cta-button {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.contact-layer .cta-button:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}


/* Footer Layer */
.footer-layer {
  background: var(--gradient-footer);
  color: var(--text-light);
  padding: var(--spacing-xl) 0 0;
  min-height: 30vh;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: var(--spacing-lg);
  font-weight: var(--font-weight-bold);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-light);
  text-decoration: none;
  opacity: 0.8;
  transition: all var(--transition-normal);
}

.footer-section a:hover {
  opacity: 1;
  color: var(--accent-color);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  align-items: center;
}

.social-links a {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  text-decoration: none;
  transition: all var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-links a svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
}

.social-links a:hover {
  background: var(--primary-color);
  transform: translateY(-2px);
  border-color: var(--primary-color);
}

.social-links a:hover svg {
  transform: scale(1.1);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
  opacity: 0.7;
}

.footer-bottom-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.footer-bottom-links a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.875rem;
  opacity: 0.8;
  transition: all var(--transition-normal);
  position: relative;
}

.footer-bottom-links a:hover {
  opacity: 1;
  color: var(--accent-color);
}

.footer-bottom-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-color);
  transition: width var(--transition-normal);
}

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

/* Common Elements */
.layer-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: var(--font-weight-black);
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

.layer-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-xl);
  opacity: 0.8;
}

.cta-button {
  display: inline-block;
  background: rgba(255, 255, 255, 0.95);
  color: var(--primary-color);
  padding: var(--spacing-md) var(--spacing-2xl);
  text-decoration: none;
  border-radius: var(--radius-xl);
  font-weight: var(--font-weight-semibold);
  font-size: 1.125rem;
  transition: all var(--transition-normal);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  background: rgba(255, 255, 255, 1);
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .layer {
    min-height: 80vh;
    padding: var(--spacing-md);
  }
  
  .services-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-info {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-bottom-links {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  /* Responsive Carousel */
  .tech-carousel-container {
    padding: 0 var(--spacing-md);
  }
  
  .tech-carousel-prev,
  .tech-carousel-next {
    width: 40px;
    height: 40px;
  }
  
  .tech-carousel-prev {
    left: 0.5rem;
  }
  
  .tech-carousel-next {
    right: 0.5rem;
  }
  
  .tech-item {
    min-width: 100px;
    padding: var(--spacing-md);
  }
  
  .tech-item img {
    width: 40px;
    height: 40px;
  }
  
  .tech-item span {
    font-size: 0.75rem;
  }
  
  /* Services and Testimonials Responsive */
  .services-carousel,
  .testimonials-carousel {
    height: 400px; /* Reduced height for mobile */
  }
  
  .services-carousel-prev,
  .services-carousel-next,
  .testimonials-carousel-prev,
  .testimonials-carousel-next {
    width: 40px;
    height: 40px;
  }
  
  .services-carousel-prev,
  .testimonials-carousel-prev {
    left: 0.5rem;
  }
  
  .services-carousel-next,
  .testimonials-carousel-next {
    right: 0.5rem;
  }
  
  .services-carousel .service-card,
  .testimonials-carousel .testimonial-card {
    flex: 0 0 calc(50% - var(--spacing-xl) / 2); /* 2 items on tablet */
  }
}

@media (max-width: 480px) {
  .tech-item {
    min-width: 80px;
    padding: var(--spacing-sm);
  }
  
  .tech-item img {
    width: 32px;
    height: 32px;
  }
  
  .tech-item span {
    font-size: 0.625rem;
  }
  
  .tech-carousel-prev,
  .tech-carousel-next {
    width: 36px;
    height: 36px;
  }
  
  .tech-indicator {
    width: 10px;
    height: 10px;
  }
  
  }

/* Loading States */
.loading {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-slow);
}

.loading.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* Focus States */
.nav-link:focus,
.cta-button:focus,
.footer-bottom-links a:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .navigation {
    display: none;
  }
  
  .layer {
    min-height: auto;
    page-break-inside: avoid;
  }
  
  .cta-button {
    display: none;
  }
}