:root {
  --primary-color: #3B82F6;
  --secondary-color: #8B5CF6;
  --accent-color: #F97316;
  --success-color: #10B981;
  --warning-color: #F59E0B;
  --error-color: #EF4444;
  
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;
  --text-inverse: #FFFFFF;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-tertiary: #F3F4F6;
  --bg-dark: #111827;
  
  --border-color: #E5E7EB;
  --border-dark: #374151;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
  
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 500ms ease;
}

[data-theme="dark"] {
  --text-primary: #F9FAFB;
  --text-secondary: #D1D5DB;
  --text-muted: #9CA3AF;
  --text-inverse: #1F2937;
  
  --bg-primary: #111827;
  --bg-secondary: #1F2937;
  --bg-tertiary: #374151;
  
  --border-color: #374151;
  --border-dark: #4B5563;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-normal);
}

[data-theme="dark"] .navbar {
  background-color: rgba(17, 24, 39, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo span {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
}

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

.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
  position: absolute;
  transition: all var(--transition-normal);
}

[data-theme="dark"] .theme-toggle .sun-icon {
  transform: translateY(-30px);
  opacity: 0;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  transform: translateY(0);
  opacity: 1;
}

.theme-toggle .sun-icon {
  transform: translateY(0);
  opacity: 1;
}

.theme-toggle .moon-icon {
  transform: translateY(30px);
  opacity: 0;
}

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

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  transition: all var(--transition-normal);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%233B82F6' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  animation: float 20s ease-in-out infinite;
}

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

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  animation: slideInLeft 1s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.hero-title {
  margin-bottom: var(--spacing-6);
}

.greeting {
  display: block;
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: var(--spacing-2);
}

.name {
  display: block;
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-2);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.role {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-8);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-4);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn::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 0.5s;
}

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

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

.btn-primary:hover {
  background-color: #2563EB;
  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-inverse);
  transform: translateY(-2px);
}

.hero-image {
  display: flex;
  justify-content: center;
  animation: slideInRight 1s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.hero-avatar {
  width: 400px;
  height: 400px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-xl);
  border: 8px solid var(--bg-primary);
}

.hero-avatar::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  border-radius: 50%;
  z-index: -1;
  animation: rotate 8s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-8);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border: 2px solid var(--primary-color);
  border-top: none;
  border-right: none;
  transform: rotate(-45deg);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* Section Styles */
section {
  padding: var(--spacing-20) 0;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-16);
  color: var(--text-primary);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -var(--spacing-3);
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

/* About Section */
.about {
  background-color: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: center;
}

.about-text p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-6);
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-6);
  margin-top: var(--spacing-8);
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-2);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-lg);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-8);
}

.skill-category {
  background-color: var(--bg-primary);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.skill-category h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-6);
  text-align: center;
}

.skill-item {
  margin-bottom: var(--spacing-6);
}

.skill-name {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-2);
}

.skill-bar {
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 4px;
  width: 0%;
  transition: width 1s ease-out;
}

/* Projects Section */
.projects {
  background-color: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-8);
}

.project-card {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-image {
  position: relative;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(59, 130, 246, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-4);
  opacity: 0;
  transition: all var(--transition-normal);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-link {
  padding: var(--spacing-2) var(--spacing-4);
  background-color: var(--text-inverse);
  color: var(--primary-color);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.project-link:hover {
  background-color: var(--text-primary);
  color: var(--text-inverse);
}

.project-content {
  padding: var(--spacing-6);
}

.project-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-3);
}

.project-content p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-4);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.project-tech span {
  padding: var(--spacing-1) var(--spacing-3);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

/* Contact Section */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: start;
}

.contact-info h3 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-4);
}

.contact-info p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-8);
  line-height: 1.8;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.contact-icon {
  font-size: var(--font-size-2xl);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  border-radius: 50%;
  border: 2px solid var(--border-color);
}

.contact-method h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-1);
}

.contact-method a,
.contact-method span {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.contact-form {
  background-color: var(--bg-primary);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: var(--spacing-6);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-4);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
  padding: var(--spacing-16) 0 var(--spacing-8) 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-8);
}

.footer-info h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-2);
}

.footer-info p {
  color: #D1D5DB;
  max-width: 400px;
}

.social-links {
  display: flex;
  gap: var(--spacing-4);
}

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
  border-radius: 50%;
  transition: all var(--transition-normal);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #D1D5DB;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-12);
  }
  
  .hero-avatar {
    width: 300px;
    height: 300px;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-12);
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-12);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--bg-primary);
    flex-direction: column;
    justify-content: start;
    padding-top: var(--spacing-8);
    transition: left var(--transition-normal);
    border-top: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .hero {
    padding-top: 70px;
  }
  
  .name {
    font-size: var(--font-size-4xl);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-avatar {
    width: 250px;
    height: 250px;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-6);
    text-align: center;
  }
  
  section {
    padding: var(--spacing-16) 0;
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-3);
  }
  
  .hero-container {
    padding: 0 var(--spacing-3);
  }
  
  .name {
    font-size: var(--font-size-3xl);
  }
  
  .hero-avatar {
    width: 200px;
    height: 200px;
  }
}