:root {
  /* Colors */
  --bg: #ffffff;
  --text: #171717;
  --text-muted: #737373;
  --text-accent: #0969da;
  --border: #e5e5e5;

  /* Typography */
  --font-sans: "Inter var", "Inter", system-ui, sans-serif;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Layout */
  --container-width: 600px;
  --nav-height: 60px;
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Enhanced page load animations */
.content > * {
  animation: fadeInUp 0.6s ease-out;
}

.content > *:nth-child(1) { animation-delay: 0.1s; }
.content > *:nth-child(2) { animation-delay: 0.2s; }
.content > *:nth-child(3) { animation-delay: 0.3s; }
.content > *:nth-child(4) { animation-delay: 0.4s; }
.content > *:nth-child(5) { animation-delay: 0.5s; }

[data-theme="dark"] {
  --bg: #0a0a0a;
  --text: #f5f5f5;
  --text-muted: #737373;
  --text-accent: #58a6ff;
  --border: #262626;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  transition: background 0.2s, color 0.2s;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}

/* Enhanced Typography and Sections */
hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--text-accent), transparent);
  margin: var(--space-12) 0;
  position: relative;
  opacity: 0.6;
}

hr::before {
  content: '✦';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg);
  padding: 0 var(--space-3);
  color: var(--text-accent);
  font-size: 1.2rem;
}

/* Enhanced headings */
h1, h2, h3, h4, h5, h6 {
  position: relative;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--text), var(--text-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

/* Enhanced blockquotes */
blockquote {
  border-left: 4px solid var(--text-accent);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--text-muted);
  background: var(--border);
  padding: var(--space-4);
  border-radius: 0 8px 8px 0;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: background 0.2s;
}

[data-theme="dark"] .nav {
  background: rgba(10, 10, 10, 0.8);
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.nav-links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.nav-controls {
  position: absolute;
  right: 0;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: 0.375rem;
  transition: all 0.2s;
  position: relative;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .nav-link:hover {
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--text);
  background: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .nav-link.active {
  background: rgba(255, 255, 255, 0.1);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: 0.375rem;
  transition: color 0.2s;
}

.mobile-menu-toggle:hover {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: 0.375rem;
  transition: color 0.2s;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: 0.375rem;
  transition: color 0.2s;
}

.mobile-menu-toggle:hover {
  color: var(--text);
}

.nav-mobile-spacer {
  display: none;
}

/* Mobile Navigation Styles */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block !important;
  }

  .nav-container {
    justify-content: flex-end;
  }

  .nav-mobile-spacer {
    display: block;
    flex: 1;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    gap: 0;
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }

  .nav-links.mobile-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-radius: 0.375rem;
  }
}

/* Page Header */
.page-header {
  text-align: center;
  padding: var(--space-16) var(--space-4) var(--space-12);
  position: relative;
  background: linear-gradient(135deg, 
    rgba(9, 105, 218, 0.05), 
    rgba(139, 92, 246, 0.05)
  );
  border-radius: 0 0 30px 30px;
  margin-bottom: var(--space-8);
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20"><path d="M0 10c20 0 20-10 40-10s20 10 40 10 20-10 40-10v10H0Z" fill="%23f8fafc" opacity="0.1"/></svg>') repeat-x;
  background-size: 100px 20px;
  opacity: 0.3;
  pointer-events: none;
}

.page-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--text-accent), #8b5cf6, #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  z-index: 1;
}

.page-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

/* Main Content */
.main {
  margin-top: var(--nav-height);
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding: 0 var(--space-6);
  min-height: calc(100vh - var(--nav-height) - 200px);
}

.page-header {
  padding: var(--space-12) 0 var(--space-8) 0;
  text-align: center;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.content {
  padding-bottom: var(--space-12);
}

/* About Content Styling */
.about-content {
  animation: fadeIn 0.8s ease-out;
}

.intro-section {
  text-align: center;
  margin-bottom: var(--space-12);
  padding: var(--space-6);
}

.intro-text {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text);
  margin: 0;
  font-weight: 400;
}

.intro-text strong {
  color: var(--text-accent);
  font-weight: 600;
}

/* Section Headers */
.about-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: var(--space-12) 0 var(--space-6) 0;
  color: var(--text);
  text-align: center;
}

/* What I Do Section */
.what-i-do {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.service-item {
  padding: var(--space-4);
  margin-bottom: var(--space-4);
}

.service-item h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.service-item p {
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

/* Approach Section */
.approach-section {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.approach-section > p {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: var(--space-4);
}

.approach-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.approach-list li {
  color: var(--text-muted);
  margin-bottom: var(--space-3);
  padding-left: var(--space-6);
  position: relative;
  line-height: 1.6;
}

.approach-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--text-accent);
  font-weight: bold;
  font-size: 1.125rem;
}

.approach-list li strong {
  color: var(--text);
  font-weight: 600;
}

/* Background Section */
.background-section {
  margin-bottom: var(--space-8);
}

.background-section > p {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  font-size: 1.125rem;
}

.interests-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2);
}

.interests-list li {
  color: var(--text-muted);
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--text-accent);
}

/* Skills Section */
.skills-container {
  margin-bottom: var(--space-12);
}

.skill-category {
  margin-bottom: var(--space-8);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-6);
  transition: all 0.3s ease;
}

.skill-category:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .skill-category:hover {
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.skill-category h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-tag {
  background: var(--border);
  color: var(--text);
  padding: var(--space-2) var(--space-3);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s ease;
  display: inline-block;
  position: relative;
  border: 2px solid transparent;
}

.skill-tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Skill levels */
.skill-expert {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
  border-color: #059669;
}

.skill-advanced {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  border-color: #2563eb;
}

.skill-intermediate {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
  border-color: #d97706;
}

.skills-legend {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: var(--border);
  border-radius: 12px;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* What I Do Section */
.what-i-do-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: var(--space-6);
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--text-accent), #8b5cf6);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.service-card:hover::before {
  opacity: 1;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border-color: var(--text-accent);
}

[data-theme="dark"] .service-card:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.service-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  display: block;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--text);
}

.service-card p {
  color: var(--text-muted);
  line-height: 1.6;
}

.what-i-do-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: var(--space-6);
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--text-accent), #8b5cf6);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.service-card:hover::before {
  opacity: 1;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border-color: var(--text-accent);
}

[data-theme="dark"] .service-card:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.service-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  display: block;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--text);
}

.service-card p {
  color: var(--text-muted);
  line-height: 1.6;
}

/* Approach Section */
.approach-section {
  margin: var(--space-8) 0;
}

.approach-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.approach-item:hover {
  background: var(--border);
  transform: translateX(8px);
}

.approach-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--text-accent), #8b5cf6);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.approach-content h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--text);
}

.approach-content p {
  color: var(--text-muted);
  line-height: 1.6;
}

/* Background Highlights */
.background-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--border);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.highlight-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .highlight-item:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.highlight-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.highlight-text {
  font-size: 0.9rem;
  color: var(--text);
}

.highlight-text strong {
  color: var(--text-accent);
}

/* Interests Grid */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-3);
  margin: var(--space-6) 0;
}

.interest-item {
  background: var(--border);
  padding: var(--space-3) var(--space-4);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text);
  transition: all 0.3s ease;
  border-left: 4px solid var(--text-accent);
}

.interest-item:hover {
  background: var(--text-accent);
  color: white;
  transform: translateX(4px);
}

/* Call to Action */
.cta-section {
  text-align: center;
  padding: var(--space-8);
  background: linear-gradient(135deg, var(--border), rgba(9, 105, 218, 0.05));
  border-radius: 20px;
  margin-top: var(--space-12);
  border: 1px solid var(--border);
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--text-accent), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-section p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: var(--space-6);
}

.cta-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-6);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--text-accent), #8b5cf6);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(9, 105, 218, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-accent);
  border-color: var(--text-accent);
}

.btn-secondary:hover {
  background: var(--text-accent);
  color: white;
  transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
  .what-i-do-grid {
    grid-template-columns: 1fr;
  }
  
  .background-highlights {
    grid-template-columns: 1fr;
  }
  
  .interests-grid {
    grid-template-columns: 1fr;
  }
  
  .approach-item {
    flex-direction: column;
    text-align: center;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .skills-legend {
    flex-direction: column;
    align-items: center;
  }
}

.cta-text {
  font-size: 1.25rem;
  margin: 0;
  color: var(--text);
}

.cta-text a {
  color: var(--text-accent);
  text-decoration: none;
  font-weight: 600;
}

.cta-text a:hover {
  text-decoration: underline;
}

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

.fade-in {
  animation: fadeIn 0.8s ease-out;
}

.content h1,
.content h2,
.content h3 {
  margin: var(--space-6) 0 var(--space-4) 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.content h1:first-child,
.content h2:first-child,
.content h3:first-child {
  margin-top: 0;
}

.content p {
  margin-bottom: var(--space-4);
  color: var(--text-muted);
  line-height: 1.7;
}

.content ul,
.content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.content li {
  margin-bottom: var(--space-2);
  color: var(--text-muted);
}

.content a {
  color: var(--text-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content blockquote {
  border-left: 3px solid var(--text-accent);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--text-muted);
}

.content code {
  background: var(--border);
  padding: var(--space-1) var(--space-2);
  border-radius: 0.25rem;
  font-size: 0.875rem;
  font-family: "SF Mono", Consolas, monospace;
}

.content pre {
  background: var(--border);
  padding: var(--space-4);
  border-radius: 0.375rem;
  overflow-x: auto;
  margin: var(--space-6) 0;
}

.content pre code {
  background: none;
  padding: 0;
}

/* Loading */
.loading {
  display: flex;
  justify-content: center;
  padding: var(--space-8);
  color: var(--text-muted);
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--space-12) 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer a {
  color: var(--text-accent);
  text-decoration: none;
}