/* CSS Variables for Theme Support */
:root {
  /* Light Theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --shadow-heavy: rgba(0, 0, 0, 0.25);
  --border-color: #dee2e6;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --card-bg: #ffffff;
  --hero-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

[data-theme="dark"] {
  /* Dark Theme */
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --text-muted: #808080;
  --accent-primary: #00d4ff;
  --accent-secondary: #0099cc;
  --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.5);
  --shadow-heavy: rgba(0, 0, 0, 0.7);
  --border-color: #333333;
  --nav-bg: rgba(10, 10, 10, 0.95);
  --card-bg: #1a1a1a;
  --hero-bg: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: all 0.3s ease;
  overflow-x: hidden;
}

/* Navigation Styles */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

nav {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.nav-brand {
  position: relative;
}

.nav-brand h1 {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  z-index: 2;
}

.nav-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--accent-gradient);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 1;
}

.nav-brand:hover .nav-glow {
  width: 120px;
  height: 120px;
  opacity: 0.1;
  filter: blur(15px);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
  padding: 0.5rem 1rem;
  border-radius: 8px;
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

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

.nav-link:hover {
  color: var(--accent-primary);
  background: var(--bg-secondary);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--accent-gradient);
  transition: left 0.3s ease;
  z-index: 1;
}

.theme-toggle:hover::before {
  left: 0;
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 10px 30px var(--shadow-medium);
}

.theme-icon {
  font-size: 1.5rem;
  position: relative;
  z-index: 2;
  transition: all 0.3s ease;
}

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

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  transition: all 0.3s ease;
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Main Content */
main {
  margin-top: 80px;
}

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

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
              radial-gradient(circle at 40% 80%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}

.hero-gradient {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--accent-gradient);
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: white;
  max-width: 800px;
  padding: 0 2rem;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero-greeting {
  display: block;
  font-size: 2rem;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.hero-name {
  display: block;
  background: linear-gradient(45deg, #fff, #00d4ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  min-height: 2rem;
}

.typing-text {
  color: #00d4ff;
  font-weight: 600;
}

.typing-cursor {
  animation: blink 1s infinite;
  color: #00d4ff;
}

.hero-description {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 3rem;
}

.hero-buttons {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-bottom: 4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: white;
  color: #667eea;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-glow {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transition: left 0.5s ease;
}

.btn:hover .btn-glow {
  left: 100%;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.scroll-indicator {
  position: absolute;
  bottom: -1rem;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-arrow-link {
  display: block;
  padding: 1rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
}

.scroll-arrow-link:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid white;
  border-bottom: 2px solid white;
  transform: rotate(45deg);
  transition: border-color 0.3s ease;
}

.scroll-arrow-link:hover .scroll-arrow {
  border-color: #00d4ff;
}

/* Section Styles */
section {
  padding: 6rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s ease;
}

section.animate-in {
  opacity: 1;
  transform: translateY(0);
}

section h2 {
  font-size: 3rem;
  text-align: center;
  margin-bottom: 4rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

section h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

/* About Section */
.about-content {
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

.about-content > p {
  font-size: 1.3rem;
  line-height: 1.8;
  margin-bottom: 4rem;
  color: var(--text-secondary);
}

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

.highlight-item {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 10px 40px var(--shadow-light);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.highlight-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gradient);
}

.highlight-item:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 60px var(--shadow-medium);
}

.highlight-item h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.highlight-item p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 10px 40px var(--shadow-light);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gradient);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 60px var(--shadow-medium);
}

.project-card h3 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.project-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tech-stack span {
  background: var(--bg-secondary);
  color: var(--accent-primary);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-links a {
  padding: 0.8rem 1.5rem;
  background: var(--accent-gradient);
  color: white;
  text-decoration: none;
  border-radius: 25px;
  font-weight: 600;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.project-links a::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: left 0.5s ease;
}

.project-links a:hover::before {
  left: 100%;
}

.project-links a:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px var(--shadow-medium);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.skill {
  background: var(--card-bg);
  padding: 2rem;
  text-align: center;
  border-radius: 15px;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.skill::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--accent-gradient);
  opacity: 0.1;
  transition: left 0.3s ease;
}

.skill:hover::before {
  left: 0;
}

.skill:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 15px 40px var(--shadow-medium);
  color: var(--accent-primary);
}

/* Contact Section */
#contact {
  background: var(--bg-secondary);
  border-radius: 30px;
  margin: 2rem auto;
  max-width: 800px;
  text-align: center;
}

.contact-links {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 2rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 2.5rem;
  background: var(--card-bg);
  border-radius: 15px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.contact-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--accent-gradient);
  opacity: 0.1;
  transition: left 0.3s ease;
}

.contact-link:hover::before {
  left: 0;
}

.contact-link:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px var(--shadow-medium);
}

.contact-icon {
  font-size: 1.5rem;
}

/* Footer */
footer {
  background: var(--bg-secondary);
  text-align: center;
  padding: 3rem 2rem;
  border-top: 1px solid var(--border-color);
}

footer p {
  color: var(--text-secondary);
}

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

@keyframes glow {
  from { text-shadow: 0 0 20px rgba(0, 212, 255, 0.5); }
  to { text-shadow: 0 0 30px rgba(0, 212, 255, 0.8); }
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

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

@keyframes gentle-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

/* Responsive Design */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--nav-bg);
    flex-direction: column;
    justify-content: flex-start;
    padding: 2rem;
    transition: left 0.3s ease;
    backdrop-filter: blur(20px);
  }
  
  .nav-links.active {
    left: 0;
  }
  
  .nav-link {
    font-size: 1.2rem;
    padding: 1rem;
    width: 100%;
    text-align: center;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-greeting {
    font-size: 1.5rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .about-highlights {
    grid-template-columns: 1fr;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
  
  .contact-links {
    flex-direction: column;
    align-items: center;
  }
  
  .contact-link {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  section {
    padding: 4rem 1rem;
  }
  
  section h2 {
    font-size: 2.5rem;
  }
}

@media (max-width: 480px) {
  nav {
    padding: 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-greeting {
    font-size: 1.2rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  section h2 {
    font-size: 2rem;
  }
  
  .highlight-item,
  .project-card {
    padding: 1.5rem;
  }
}