:root {
  --radius: 0.65rem;
  --background: oklch(0.141 0.005 285.823);
  --foreground: oklch(0.985 0 0);
  --card: oklch(0.21 0.006 285.885);
  --card-foreground: oklch(0.985 0 0);
  --popover: oklch(0.21 0.006 285.885);
  --popover-foreground: oklch(0.985 0 0);
  --primary: oklch(0.645 0.246 16.439);
  --primary-foreground: oklch(0.969 0.015 12.422);
  --secondary: oklch(0.274 0.006 286.033);
  --secondary-foreground: oklch(0.985 0 0);
  --muted: oklch(0.274 0.006 286.033);
  --muted-foreground: oklch(0.705 0.015 286.067);
  --accent: oklch(0.274 0.006 286.033);
  --accent-foreground: oklch(0.985 0 0);
  --destructive: oklch(0.704 0.191 22.216);
  --border: oklch(1 0 0 / 10%);
  --input: oklch(1 0 0 / 15%);
  --ring: oklch(0.645 0.246 16.439);
  --chart-1: oklch(0.488 0.243 264.376);
  --chart-2: oklch(0.696 0.17 162.48);
  --chart-3: oklch(0.769 0.188 70.08);
  --chart-4: oklch(0.627 0.265 303.9);
  --chart-5: oklch(0.645 0.246 16.439);
  --sidebar: oklch(0.21 0.006 285.885);
  --sidebar-foreground: oklch(0.985 0 0);
  --sidebar-primary: oklch(0.645 0.246 16.439);
  --sidebar-primary-foreground: oklch(0.969 0.015 12.422);
  --sidebar-accent: oklch(0.274 0.006 286.033);
  --sidebar-accent-foreground: oklch(0.985 0 0);
  --sidebar-border: oklch(1 0 0 / 10%);
  --sidebar-ring: oklch(0.645 0.246 16.439);
}

.dark {
  --background: oklch(0.141 0.005 285.823);
  --foreground: oklch(0.985 0 0);
  --card: oklch(0.21 0.006 285.885);
  --card-foreground: oklch(0.985 0 0);
  --popover: oklch(0.21 0.006 285.885);
  --popover-foreground: oklch(0.985 0 0);
  --primary: oklch(0.645 0.246 16.439);
  --primary-foreground: oklch(0.969 0.015 12.422);
  --secondary: oklch(0.274 0.006 286.033);
  --secondary-foreground: oklch(0.985 0 0);
  --muted: oklch(0.274 0.006 286.033);
  --muted-foreground: oklch(0.705 0.015 286.067);
  --accent: oklch(0.274 0.006 286.033);
  --accent-foreground: oklch(0.985 0 0);
  --destructive: oklch(0.704 0.191 22.216);
  --border: oklch(1 0 0 / 10%);
  --input: oklch(1 0 0 / 15%);
  --ring: oklch(0.645 0.246 16.439);
  --chart-1: oklch(0.488 0.243 264.376);
  --chart-2: oklch(0.696 0.17 162.48);
  --chart-3: oklch(0.769 0.188 70.08);
  --chart-4: oklch(0.627 0.265 303.9);
  --chart-5: oklch(0.645 0.246 16.439);
  --sidebar: oklch(0.21 0.006 285.885);
  --sidebar-foreground: oklch(0.985 0 0);
  --sidebar-primary: oklch(0.645 0.246 16.439);
  --sidebar-primary-foreground: oklch(0.969 0.015 12.422);
  --sidebar-accent: oklch(0.274 0.006 286.033);
  --sidebar-accent-foreground: oklch(0.985 0 0);
  --sidebar-border: oklch(1 0 0 / 10%);
  --sidebar-ring: oklch(0.645 0.246 16.439);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background);
  color: var(--foreground);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

html {
  height: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Navbar */
.navbar {
  background-color: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: var(--card / 95%);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--foreground);
  background: linear-gradient(135deg, var(--primary), var(--chart-1));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--muted-foreground);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
}

.nav-link:hover {
  color: var(--foreground);
  background-color: var(--accent);
}

/* Header */
.header {
  text-align: center;
  padding: 3rem 0 2rem;
}

.title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--chart-1));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--muted-foreground);
  font-weight: 400;
}

/* Main Content */
.main {
  padding: 2rem 0;
  flex: 1;
  width: 100%;
}

/* Search Section */
.search-section {
  margin-bottom: 3rem;
}

.search-hint {
  text-align: center;
  margin-top: 1rem;
  color: var(--muted-foreground);
  font-size: 1.1rem;
}

.example-username {
  color: var(--primary);
  font-weight: 600;
  font-family: 'Monaco', 'Menlo', monospace;
  cursor: pointer;
  transition: color 0.2s ease;
}

.example-username:hover {
  color: var(--chart-1);
  text-decoration: underline;
}

.search-container {
  display: flex;
  gap: 0.75rem;
  max-width: 500px;
  margin: 0 auto;
}

.search-input {
  flex: 1;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--input);
  color: var(--foreground);
  font-size: 1rem;
  transition: all 0.2s ease;
  outline: none;
}

.search-input:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 3px var(--ring / 20%);
}

.search-input::placeholder {
  color: var(--muted-foreground);
}

.search-button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  background-color: var(--primary);
  color: var(--primary-foreground);
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.search-button:hover {
  background-color: var(--primary / 90%);
  transform: translateY(-1px);
}

.search-button:active {
  transform: translateY(0);
}

.search-icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* Loading */
.loading {
  text-align: center;
  padding: 3rem 0;
}

.spinner {
  width: 3rem;
  height: 3rem;
  border: 3px solid var(--border);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

/* Error */
.error {
  text-align: center;
  padding: 3rem 0;
  color: var(--destructive);
}

.error-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* Profile Section */
.profile-section {
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.profile-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px -1px var(--foreground / 5%);
}

.profile-header {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 3px solid var(--border);
}

.profile-info {
  flex: 1;
}

.display-name {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 0.25rem;
}

.username {
  font-size: 1.125rem;
  color: var(--muted-foreground);
  margin-bottom: 1rem;
  font-family: 'Monaco', 'Menlo', monospace;
}

.bio {
  color: var(--foreground);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.profile-stats {
  display: flex;
  gap: 2rem;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Section Titles */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

/* Tech Stack */
.tech-stack-section {
  margin-bottom: 3rem;
}

.tech-stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.tech-item {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s ease;
}

.tech-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px -5px var(--foreground / 10%);
}

.tech-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 0.5rem;
}

.tech-percentage {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.tech-bar {
  width: 100%;
  height: 8px;
  background-color: var(--muted);
  border-radius: 4px;
  overflow: hidden;
}

.tech-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--chart-1), var(--chart-2));
  border-radius: 4px;
  transition: width 0.8s ease;
}

/* Repositories */
.repositories-section {
  margin-bottom: 3rem;
}

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

.repo-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.2s ease;
}

.repo-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px -5px var(--foreground / 10%);
}

.repo-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.repo-name a {
  color: inherit;
  text-decoration: none;
}

.repo-name a:hover {
  color: var(--primary);
}

.repo-description {
  color: var(--muted-foreground);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.repo-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

.repo-meta span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.repo-language {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 0.25rem;
}

/* Footer */
.footer {
  background-color: var(--card);
  border-top: 1px solid var(--border);
  margin-top: auto;
  padding: 3rem 0 1rem;
  flex-shrink: 0;
  width: 100%;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
  width: 100%;
}

.footer-section {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), var(--chart-1));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-description {
  color: var(--muted-foreground);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.footer-subtitle {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: row;
  gap: 1.5rem;
  align-items: center;
}

.footer-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted-foreground);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
  padding: 0.5rem 0;
  border-radius: var(--radius);
}

.footer-link:hover {
  color: var(--foreground);
  transform: translateX(4px);
}

.footer-icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.footer-bottom {
  text-align: center;
  padding: 1.5rem 0;
  color: var(--muted-foreground);
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 0.75rem;
  }
  
  .nav-container {
    padding: 0 0.75rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .nav-link {
    padding: 0.375rem 0.5rem;
    font-size: 0.875rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .title {
    font-size: 2rem;
  }
  
  .search-container {
    flex-direction: column;
  }
  
  .profile-header {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .avatar {
    width: 100px;
    height: 100px;
  }
  
  .profile-stats {
    justify-content: center;
  }
  
  .tech-stack-grid {
    grid-template-columns: 1fr;
  }
  
  .repositories-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 2rem 0 1.5rem;
  }
  
  .title {
    font-size: 1.75rem;
  }
  
  .profile-card {
    padding: 1.5rem;
  }
  
  .profile-stats {
    gap: 1rem;
  }
}