/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary-color: #1e40af;
  --accent-color: #f59e0b;
  --accent-light: #fbbf24;
  
  /* Text Colors */
  --text-dark: #1f2937;
  --text-medium: #374151;
  --text-light: #6b7280;
  --text-white: #ffffff;
  
  /* Background Colors */
  --bg-white: #ffffff;
  --bg-light: #f9fafb;
  --bg-dark: #1f2937;
  --bg-darker: #111827;
  
  /* Border & Shadow */
  --border-color: #e5e7eb;
  --border-dark: #d1d5db;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* 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;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Container */
  --container-max-width: 1200px;
  --container-padding: 1rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* ===== UTILITY CLASSES ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-white);
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-subtitle {
  color: #d1d5db;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  font-size: 1rem;
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

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

.btn-outline {
  background-color: transparent;
  color: var(--text-dark);
  border-color: var(--border-dark);
}

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

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

.btn-white:hover {
  background-color: #f3f4f6;
}

.btn-outline-white {
  background-color: transparent;
  color: var(--text-white);
  border-color: var(--text-white);
}

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

/* ===== HEADER & NAVIGATION ===== */
.header {
  background-color: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--container-padding);
  min-height: 70px;
}

.nav-brand .nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--text-medium);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-color);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.bar {
  width: 25px;
  height: 3px;
  background-color: var(--text-dark);
  margin: 2px 0;
  transition: var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero {
  background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-white) 100%);
  padding: 120px 0 var(--spacing-3xl);
  margin-top: 70px;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
}

.hero-highlight {
  display: block;
  color: var(--primary-color);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

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

.hero-icon {
  font-size: 200px;
  color: var(--primary-color);
  opacity: 0.1;
}

/* ===== SERVICES OVERVIEW ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: var(--spacing-3xl);
}

.service-category {
  background-color: var(--bg-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.category-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-dark);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--primary-color);
}

.category-title i {
  color: var(--primary-color);
  font-size: 1.25rem;
}

.services-list {
  display: grid;
  gap: var(--spacing-lg);
}

.service-card {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.service-card:hover {
  background-color: var(--bg-light);
  border-color: var(--border-color);
  transform: translateY(-2px);
}

.service-icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: var(--text-white);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.service-title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  color: var(--text-dark);
  margin-bottom: var(--spacing-xs);
}

.service-description {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ===== FEATURES GRID ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.feature-item {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-lg);
  background-color: var(--accent-color);
  color: var(--text-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-sizing: border-box;
  min-width: 80px;
  min-height: 80px;
  max-width: 80px;
  max-height: 80px;
}
.feature-icon .fas {
  font-size: 40px !important;
}
.feature-title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

.feature-description {
  color: #d1d5db;
  line-height: 1.6;
}

/* ===== PORTFOLIO PREVIEW ===== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.portfolio-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

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

.portfolio-image {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-white);
  font-size: 3rem;
}

.portfolio-content {
  padding: var(--spacing-xl);
}

.portfolio-title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

.portfolio-description {
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.portfolio-tech {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.tech-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--bg-light);
  color: var(--text-medium);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
}

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

/* ===== CONTACT CTA ===== */
.contact-cta {
  text-align: center;
}

.cta-content {
  max-width: 700px;
  margin: 0 auto;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

.cta-description {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
  line-height: 1.6;
}

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

/* ===== FOOTER ===== */
.footer {
  background-color: var(--bg-darker);
  color: var(--text-white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

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

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

.footer-section h3 {
  color: var(--primary-color);
  font-size: 1.25rem;
}

.footer-section h4 {
  font-size: 1.125rem;
}

.footer-section p {
  color: #d1d5db;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-section ul li a {
  color: #d1d5db;
  transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
  color: var(--primary-color);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.contact-info p {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: 0;
}

.contact-info i {
  color: var(--primary-color);
  width: 16px;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid #374151;
  color: #9ca3af;
}

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

.service-card,
.feature-item,
.portfolio-card {
  animation: fadeInUp 0.6s ease-out forwards;
}

.service-card:nth-child(2) { animation-delay: 0.1s; }
.service-card:nth-child(3) { animation-delay: 0.2s; }
.service-card:nth-child(4) { animation-delay: 0.3s; }

.feature-item:nth-child(2) { animation-delay: 0.15s; }
.feature-item:nth-child(3) { animation-delay: 0.3s; }
.feature-item:nth-child(4) { animation-delay: 0.45s; }

.portfolio-card:nth-child(2) { animation-delay: 0.2s; }
.portfolio-card:nth-child(3) { animation-delay: 0.4s; }

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  :root {
    --container-padding: 2rem;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  /* Navigation */
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--bg-white);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl) 0;
    gap: var(--spacing-lg);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  
  .nav-toggle.active .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  
  /* Hero Section */
  .hero {
    padding: 100px 0 var(--spacing-2xl);
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-xl);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-icon {
    font-size: 150px;
  }
  
  /* Services */
  .services-list {
    gap: var(--spacing-md);
  }
  
  .service-card {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  /* Features */
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  /* Portfolio */
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  /* Buttons */
  .hero-cta,
  .cta-buttons {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  /* Typography */
  .section-title {
    font-size: 1.875rem;
  }
  
  .cta-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .cta-title {
    font-size: 1.75rem;
  }
  
  .service-category,
  .portfolio-card {
    padding: var(--spacing-lg);
  }
  
  .hero-icon {
    font-size: 100px;
  }
  
  .feature-icon {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states */
.btn:focus-visible,
.nav-link:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3);
  }
  
  .service-card,
  .portfolio-card {
    border: 1px solid var(--border-dark);
  }
}