@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Source+Code+Pro:wght@400;500;600&display=swap');

:root {
  --primary-color: #0f172a;
  --secondary-color: #1e293b;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --background: #020617;
  --surface: #0f172a;
  --surface-hover: #1e293b;
  --border: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Poppins', sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Preloader Styles */
#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--background);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10000;
  transition: opacity 0.5s ease-out;
}

#preloader img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  box-shadow: var(--shadow-xl);
  border: 3px solid var(--accent-color);
}

.preloader-text {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 500;
  margin-top: 1.5rem;
  opacity: 0.8;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--surface);
  border-top: 3px solid var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-top: 1rem;
}

/* Main Content */
#main-content {
  display: none;
  min-height: 100vh;
  animation: fadeIn 0.8s ease-out;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(2, 6, 23, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(2, 6, 23, 0.98);
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

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

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

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

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

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--accent-color);
  font-weight: 500;
  margin-bottom: 1rem;
  opacity: 0;
  animation: slideUp 0.8s ease 0.2s forwards;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  animation: slideUp 0.8s ease 0.4s forwards;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  animation: slideUp 0.8s ease 0.6s forwards;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: slideUp 0.8s ease 0.8s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* Sections */
.section {
  padding: 5rem 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* About Section */
.about {
  background: var(--surface);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-text p {
  margin-bottom: 1.5rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.stat-card {
  text-align: center;
  padding: 1.5rem;
  background: var(--surface-hover);
  border-radius: 16px;
  border: 1px solid var(--border);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-color);
  display: block;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

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

.skill-card {
  background: var(--surface);
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  text-align: center;
  transition: all 0.3s ease;
}

.skill-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-lg);
}

.skill-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-accent);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 1.5rem;
}

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

.skill-level {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Projects Section */
.projects {
  background: var(--surface);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--background);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  position: relative;
}

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

.project-image {
  height: 200px;
  background: var(--gradient-primary);
  position: relative;
  overflow: hidden;
}

.project-image iframe {
  position: absolute;
  width: 100%;
  top: -50px; /* adjust to center vertically */
  left: 50%;
  transform: translateX(-50%);
  overflow:hidden;
}

.project-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover .project-image::before {
  opacity: 1;
}

.project-content {
  padding: 2rem;
}

.project-category {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project-category.hw {
  background: var(--warning);
}

.project-category.animation {
  background: var(--gradient-secondary);
}

.project-category.sample {
  background: var(--success);
}

.project-title {
  font-size: 1.375rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

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

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

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--surface-hover);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 50px;
  font-weight: 500;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.project-link:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
  transform: translateX(4px);
}

.project-link.primary {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.project-link.primary:hover {
  background: var(--accent-hover);
}

/* Contact Section */
.contact {
  background: var(--background);
}

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

.contact-info {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.contact-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

/* Footer */
.footer {
  background: var(--surface);
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-content {
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

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

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-info {
    flex-direction: column;
    align-items: center;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .container {
    padding: 0 1rem;
  }
}

@media (max-width: 480px) {
  .project-content {
    padding: 1.5rem;
  }
  
  .skill-card {
    padding: 1.5rem;
  }
  
  .hero-content {
    padding: 0 1rem;
  }
}

/* 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;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
.keyboard-navigation *:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}