/* ============================================
   Modern Landing Page - Design System
   ============================================ */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@600;700;800&display=swap');

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors - Dark Mode Palette */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #1a1a2e;
  --color-bg-tertiary: #16213e;
  
  /* Accent Colors */
  --color-accent-purple: #8b5cf6;
  --color-accent-blue: #3b82f6;
  --color-accent-cyan: #06b6d4;
  --color-accent-pink: #ec4899;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 100%);
  --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
  --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 50%, #16213e 100%);
  --gradient-card: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
  
  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0aec0;
  --color-text-muted: #718096;
  
  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Font Sizes - Fluid Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --font-size-xl: clamp(1.5rem, 1.25rem + 1.25vw, 2.25rem);
  --font-size-2xl: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
  --font-size-3xl: clamp(2.5rem, 2rem + 2.5vw, 4.5rem);
  
  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --container-padding: 2rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.4);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-accent-cyan);
}

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

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

/* ============================================
   Button Styles
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

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

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

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #a78bfa 0%, #60a5fa 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span {
  position: relative;
  z-index: 1;
}

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

.btn-secondary:hover {
  background: var(--color-accent-purple);
  transform: translateY(-2px);
}

/* ============================================
   Card Styles
   ============================================ */
.card {
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-secondary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-cyan);
}

.card:hover::before {
  opacity: 0.1;
}

.card > * {
  position: relative;
  z-index: 1;
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.card h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  animation: float 20s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  animation: float 25s ease-in-out infinite reverse;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
  animation: fadeInUp 1s ease-out;
}

.hero h1 {
  margin-bottom: var(--space-md);
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.6s both;
}

/* ============================================
   Features Section
   ============================================ */
.features {
  background: var(--color-bg-secondary);
  position: relative;
}

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

.section-subtitle {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-accent-purple);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

/* ============================================
   Testimonials Section
   ============================================ */
.testimonials {
  background: var(--color-bg-primary);
}

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

.testimonial-card {
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-purple);
}

.testimonial-text {
  font-size: var(--font-size-base);
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.author-info h4 {
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  margin-bottom: 0.25rem;
}

.author-info p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ============================================
   CTA Section
   ============================================ */
.cta {
  background: var(--gradient-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg width="60" height="60" xmlns="http://www.w3.org/2000/svg"><circle cx="30" cy="30" r="1" fill="white" opacity="0.1"/></svg>');
  animation: float 30s linear infinite;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta h2 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.cta p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-bg-secondary);
  padding: var(--space-2xl) 0 var(--space-lg);
  border-top: 1px solid rgba(139, 92, 246, 0.2);
}

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

.footer-links {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent-purple);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--gradient-card);
  border: 1px solid rgba(139, 92, 246, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--gradient-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

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

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

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) rotate(0deg);
  }
  33% {
    transform: translate(30px, -30px) rotate(120deg);
  }
  66% {
    transform: translate(-20px, 20px) rotate(240deg);
  }
}

@keyframes gradient-shift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  :root {
    --container-padding: 1.5rem;
    --space-3xl: 4rem;
  }
  
  .hero {
    min-height: 90vh;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    width: 100%;
  }
  
  .features-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--space-2xl) 0;
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* ============================================
   Experience Section (Timeline)
   ============================================ */
.experience {
  background: var(--color-bg-secondary);
  position: relative;
}

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-purple) 0%, var(--color-accent-blue) 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-3xl);
  animation: fadeInUp 0.6s ease-out;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-xl) - 8px);
  top: 0;
  width: 18px;
  height: 18px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  border: 3px solid var(--color-bg-secondary);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
  z-index: 1;
}

.timeline-content {
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
}

.timeline-content:hover {
  transform: translateX(8px);
  border-color: var(--color-accent-purple);
  box-shadow: var(--shadow-lg);
}

.timeline-header {
  margin-bottom: var(--space-md);
}

.timeline-header h3 {
  color: var(--color-text-primary);
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.company-info {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

.company-name {
  color: var(--color-accent-cyan);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

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

.timeline-description {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-full);
  color: var(--color-accent-purple);
  font-size: var(--font-size-xs);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(139, 92, 246, 0.25);
  border-color: var(--color-accent-purple);
  transform: translateY(-2px);
}

/* ============================================
   Skills Section
   ============================================ */
.skills {
  background: var(--color-bg-primary);
  position: relative;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}