/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Playfair+Display:wght@700;900&display=swap');

/* CSS Variables - Design System */
:root {
  /* Color Palette */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --dark-gradient: linear-gradient(135deg, #1e1e2e 0%, #2a2a3e 100%);
  
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --accent-color: #4facfe;
  --text-light: #e8e8f0;
  --text-dark: #1e1e2e;
  --bg-dark: #0f0f1e;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.1);
  
  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-display: 'Playfair Display', serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  
  /* 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(102, 126, 234, 0.3);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 40% 90%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
  z-index: -1;
  animation: backgroundShift 15s ease infinite;
}

@keyframes backgroundShift {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(15, 15, 30, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  transition: var(--transition-fast);
}

.nav-logo:hover {
  transform: scale(1.05);
}

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

.nav-link {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transform: translateX(-50%);
  transition: var(--transition-fast);
}

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

.nav-link:hover::after {
  width: 80%;
}

.nav-link.active {
  background: var(--bg-card);
}

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

.hero-content {
  max-width: 1400px;
  width: 100%;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--accent-color);
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.8s ease;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, #ffffff 0%, #a0a0ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-description {
  font-size: 1.3rem;
  color: var(--text-light);
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto var(--spacing-md);
  animation: fadeInUp 0.8s ease 0.4s backwards;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-normal);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-md);
  animation: fadeInUp 0.8s ease 0.6s backwards;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: var(--transition-slow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  background: transparent;
  color: var(--text-light);
  border: 2px solid var(--primary-color);
  animation: fadeInUp 0.8s ease 0.7s backwards;
}

.btn-secondary:hover {
  background: var(--primary-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Sections */
.section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  margin-bottom: var(--spacing-md);
  text-align: center;
  background: linear-gradient(135deg, #ffffff 0%, #a0a0ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: var(--text-light);
  opacity: 0.8;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
  height: 100%;
}

.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(102, 126, 234, 0.3);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: var(--spacing-sm);
  transition: var(--transition-normal);
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--shadow-glow);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-light);
}

.card-description {
  color: var(--text-light);
  opacity: 0.8;
  line-height: 1.6;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Project Cards */
.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(102, 126, 234, 0.5);
}

.project-image {
  width: 100%;
  height: 250px;
  background: var(--dark-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.project-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition-normal);
}

.project-card:hover .project-image::after {
  opacity: 0.2;
}

.project-content {
  padding: var(--spacing-md);
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-light);
}

.project-description {
  color: var(--text-light);
  opacity: 0.8;
  margin-bottom: var(--spacing-sm);
}

.project-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.tag {
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  background: rgba(102, 126, 234, 0.2);
  color: var(--accent-color);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid rgba(102, 126, 234, 0.3);
}

/* Skills Grid */
.skill-item {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
  text-align: center;
}

.skill-item:hover {
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  border-color: rgba(102, 126, 234, 0.4);
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
  display: block;
}

.skill-name {
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.skill-level {
  font-size: 0.9rem;
  color: var(--accent-color);
  opacity: 0.9;
}

/* Contact Form */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--text-light);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-light);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
  background: var(--bg-card-hover);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

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

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-fast);
}

.contact-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(102, 126, 234, 0.3);
}

.contact-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.contact-details h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  color: var(--text-light);
}

.contact-details p {
  color: var(--text-light);
  opacity: 0.8;
}

/* Footer */
.footer {
  background: rgba(15, 15, 30, 0.8);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  text-align: center;
}

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

.social-link {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  text-decoration: none;
  font-size: 1.3rem;
  transition: var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-link:hover {
  background: var(--primary-gradient);
  transform: translateY(-3px) scale(1.1);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.footer-text {
  color: var(--text-light);
  opacity: 0.7;
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

.floating {
  animation: float 3s ease-in-out infinite;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    gap: var(--spacing-sm);
  }
  
  .nav-link {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
  
  .hero {
    min-height: 80vh;
    padding: var(--spacing-md);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-description {
    font-size: 1.1rem;
  }
  
  .btn-group {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

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

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

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }