:root {
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #111827;
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;
  --color-primary: #7c3aed;
  --color-primary-dark: #6d28d9;
  --color-primary-light: #a78bfa;
  --color-border: rgba(255,255,255,0.08);
  --color-border-hover: rgba(255,255,255,0.15);
}

html[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text-primary: #1e293b;
  --color-text-secondary: #475569;
  --color-text-tertiary: #64748b;
  --color-border: rgba(0,0,0,0.08);
  --color-border-hover: rgba(0,0,0,0.15);
}

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

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

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: rgba(0, 0, 0, 0.3);
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  transition: all 0.3s ease;
  z-index: 1000;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-primary);
  transform: scale(1.1);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Hero Section */
.hero {
  padding: 100px 20px;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 2.8rem;
  margin-bottom: 20px;
  font-weight: 800;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 15px;
  font-weight: 600;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 30px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
  border: none;
  cursor: pointer;
}

.btn.primary {
  background: var(--color-primary);
  color: white;
}

.btn.primary:hover {
  background: var(--color-primary-dark);
}

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

.btn.secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: white;
}

.hero-image img {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
  .hero {
    padding: 60px 20px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-text h1 {
    font-size: 2rem;
  }
}

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

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--color-border);
  font-size: 14px;
  margin-bottom: 12px;
  color: var(--color-primary);
  font-weight: 600;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.section-header p {
  max-width: 760px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* GitHub Stats Section */
.github-stats-section {
  padding: 80px 20px;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}
var(--color-border-hover);
  background: transparent;
  color: var(--color-text-primary);
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: 0.25s ease;
  font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.filter-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 24px;
}

.project-card {
  background: linear-gradient(180deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 12px 35px rgba(0,0,0,0.22);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.project-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(124, 58, 237, 0.15);
}

.project-image {
  width: 100%;
  height: 190px;
  object-fit: cover;
  background: var(--color-bg-tertiary);
}

.project-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-type {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary-light);
}

.project-title {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--color-text-primary);
}

.project-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.project-meta {
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: var(--color-text-tertiary);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.project-tag {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
}

.project-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.project-link {
  text-decoration: none;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: 12px;
  transition: 0.25s ease;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
}

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

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

.project-link.secondary {
  border: 1px solid var(--color-border-hover);
  color: var(--color-text-primary);
  background: transparent;
}

.project-link.secondary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

/* Blog Section */
.blog-section {
  padding: 80px 20px;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.blog-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(124, 58, 237, 0.2);
}

.blog-header {
  padding: 20px;
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
}

.blog-date {
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.blog-title {
  font-size: 1.3rem;
  color: var(--color-text-primary);
  margin-bottom: 10px;
}

.blog-content {
  padding: 20px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.blog-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 15px;
  line-height: 1.6;
}

.blog-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

.blog-tag {
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
}

.blog-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  margin-top: auto;
  transition: all 0.3s ease;
  align-self: flex-start;
}

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

/* Footer */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 60px 20px 20px;
  color: var(--color-text-secondary);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  color: var(--color-text-primary);
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-tertiary);order: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 12px 35px rgba(0,0,0,0.22);
  display: flex;
  flex-direction: column;
}

.project-image {
  width: 100%;
  height: 190px;
  object-fit: cover;
  background: #0b1220;
}

.project-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-type {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #a78bfa;
}

.project-title {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.project-description {
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.project-meta {
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: #94a3b8;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.project-tag {
  background: rgba(255,255,255,0.08);
  color: #e2e8f0;
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
}

.project-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.project-link {
  text-decoration: none;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: 12px;
  transition: 0.25s ease;
}

.project-link.primary {
  background: #7c3aed;
  color: #fff;
}

.project-link.primary:hover {
  background: #6d28d9;
}

.project-link.secondary {
  border: 1px solid rgba(255,255,255,0.15);
  color: #fff;
}

.project-link.secondary:hover {
  background: rgba(255,255,255,0.08);
}

@media (max-width: 768px) {
  .projects-section {
    padding: 60px 16px;
  }

  .section-header h2 {
    font-size: 1.7rem;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .github-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-text h1 {
    font-size: 1.8rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

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

/* Print styles */
@media print {
  .theme-toggle {
    display: none;
  }

  .footer {
    display: none;
  }
}

/* Loading animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}