/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Colors */
  --color-primary: #6366f1; /* Vibrant indigo */
  --color-primary-dark: #4f46e5;
  --color-primary-light: #818cf8;
  --color-secondary: #8b5cf6; /* Vibrant purple */
  --color-accent: #06b6d4; /* Bright cyan */
  
  --color-bg-primary: #0f0f23; /* Very dark navy */
  --color-bg-secondary: #1e1e3f;
  --color-bg-tertiary: #2a2a5a;
  --color-bg-card: #1a1a35;
  
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  
  --color-border: #334155;
  --color-border-light: #475569;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  --gradient-accent: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  --gradient-card: linear-gradient(135deg, var(--color-bg-card), var(--color-bg-tertiary));
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-base: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;
  --spacing-4xl: 4rem;
  --spacing-5xl: 5rem;
  --spacing-6xl: 6rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-base: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Container */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

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

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

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ===== UTILITIES ===== */
.container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-align: center;
  border: none;
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-base);
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background: rgba(99, 102, 241, 0.1);
}

.btn-large {
  padding: var(--spacing-base) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 15, 35, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(15, 15, 35, 0.98);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-logo a {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-2xl);
}

.nav-link {
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

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

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

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

.nav-toggle .bar {
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 4rem;
    left: -100%;
    width: 100%;
    height: calc(100vh - 4rem);
    background: var(--color-bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-xl);
    padding-top: var(--spacing-3xl);
    transition: left var(--transition-base);
    border-top: 1px solid var(--color-border);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .nav-toggle.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) 0;
  background: 
    radial-gradient(ellipse at top left, rgba(99, 102, 241, 0.15), transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(139, 92, 246, 0.15), transparent 50%),
    var(--color-bg-primary);
}

.hero-container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}

.hero-content {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s ease-out forwards;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.7;
}

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

/* Phone Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s ease-out 0.3s forwards;
}

.phone-mockup {
  width: 280px;
  height: 560px;
  background: var(--color-bg-card);
  border-radius: var(--spacing-2xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.phone-mockup::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0.1;
  border-radius: var(--spacing-2xl);
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--color-bg-primary);
  border-radius: var(--spacing-lg);
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.app-preview {
  width: 100%;
  height: 100%;
}

.app-header {
  width: 100%;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-base);
  margin-bottom: var(--spacing-lg);
  opacity: 0.8;
}

.app-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
}

.content-line {
  height: 20px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
  animation: pulse 2s ease-in-out infinite;
}

.content-line.short {
  width: 60%;
}

.content-block {
  height: 120px;
  background: var(--gradient-card);
  border-radius: var(--radius-base);
  animation: pulse 2s ease-in-out infinite 0.5s;
}

/* Mobile Hero Styles */
@media (max-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-2xl);
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .phone-mockup {
    width: 240px;
    height: 480px;
  }

  .hero-buttons {
    justify-content: center;
  }
}

/* ===== PORTFOLIO SECTION ===== */
.portfolio {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-secondary);
}

.portfolio-item {
  background: var(--gradient-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.portfolio-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}

.portfolio-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-base);
  color: var(--color-text-primary);
}

.portfolio-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.portfolio-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-2xl);
}

.feature-tag {
  background: rgba(99, 102, 241, 0.2);
  color: var(--color-primary-light);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.external-icon {
  margin-left: var(--spacing-xs);
}

/* App Showcase */
.app-showcase {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.app-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}

.icon-gradient {
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  opacity: 0.8;
}

.app-screens {
  position: relative;
}

.screen {
  width: 200px;
  height: 350px;
  background: var(--color-bg-primary);
  border-radius: var(--spacing-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.screen-header {
  width: 100%;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-base);
  margin-bottom: var(--spacing-lg);
  opacity: 0.7;
}

.screen-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.progress-ring {
  width: 80px;
  height: 80px;
  border: 4px solid var(--color-bg-secondary);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 3s linear infinite;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-base);
  width: 100%;
}

.stat-item {
  height: 40px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-base);
  animation: pulse 2s ease-in-out infinite;
}

/* Mobile Portfolio Styles */
@media (max-width: 768px) {
  .portfolio-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .screen {
    width: 180px;
    height: 320px;
  }
}

/* ===== SERVICES SECTION ===== */
.services {
  padding: var(--spacing-3xl) 0;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.service-card {
  background: var(--gradient-card);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.service-card:hover::before {
  opacity: 0.05;
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.service-icon {
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.service-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-base);
  color: var(--color-text-primary);
  position: relative;
  z-index: 1;
}

.service-description {
  color: var(--color-text-secondary);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* ===== ABOUT SECTION ===== */
.about {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-secondary);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-4xl);
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-2xl);
}

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

.highlight-number {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--spacing-xs);
}

.highlight-text {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

/* Mobile About Styles */
@media (max-width: 768px) {
  .about-highlights {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
}

/* ===== CONTACT SECTION ===== */
.contact {
  padding: var(--spacing-3xl) 0;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3xl);
  line-height: 1.7;
}

.contact-info {
  margin-bottom: var(--spacing-3xl);
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-base);
  transition: color var(--transition-fast);
}

.contact-email:hover {
  color: var(--color-primary);
}

.email-icon {
  flex-shrink: 0;
}

.contact-response {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ===== FOOTER ===== */
.footer {
  padding: var(--spacing-2xl) 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-base);
}

.footer-logo a {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.footer-text a {
  color: var(--color-primary-light);
  transition: color var(--transition-fast);
}

.footer-text a:hover {
  color: var(--color-primary);
}

/* Mobile Footer Styles */
@media (max-width: 768px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 0.4;
  }
  50% {
    opacity: 0.8;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --spacing-6xl: 3rem;
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --spacing-6xl: 2.5rem;
    --spacing-5xl: 2rem;
    --spacing-4xl: 1.5rem;
  }

  .container {
    padding: 0 var(--spacing-base);
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

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

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 1.75rem;
    --font-size-4xl: 1.5rem;
  }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
/* Reduce motion for users who prefer it */
@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;
  }
}

/* Improve text rendering */
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ===== IMAGE STYLES ===== */

/* Base image styles */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Responsive images */
.img-responsive {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* Image containers */
.img-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-base);
}

.img-container img {
  transition: transform var(--transition-base);
}

.img-container:hover img {
  transform: scale(1.05);
}

/* Service icons */
.service-icon img {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.service-card:hover .service-icon img {
  transform: scale(1.1);
}

/* Portfolio images */
.portfolio-image img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Hero images */
.hero-visual img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Logo images */
.nav-logo img {
  height: 32px;
  width: auto;
}

.footer-logo img {
  height: 24px;
  width: auto;
}

/* Lazy loading optimization */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
  opacity: 1;
}

/* Image loading states */
.img-loading {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-base);
  position: relative;
  overflow: hidden;
}

.img-loading::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* Retina display optimization */
@media (min-resolution: 2dppx) {
  .hero-phone-mockup {
    /* High-res image will be swapped via JavaScript or picture element */
  }
}

/* Mobile image adjustments */
@media (max-width: 768px) {
  .service-icon img {
    width: 40px;
    height: 40px;
  }
}

/* GPU acceleration for animations */
.service-card,
.btn,
.img-container img {
  will-change: transform;
}

.hero-content,
.hero-visual {
  will-change: opacity, transform;
}