:root {
  /* Colors - Modern dark with oklch */
  --bg-primary: oklch(0.98 0 0);
  --bg-secondary: oklch(0.96 0 0);
  --bg-dark: oklch(0.15 0 0);
  --text-primary: oklch(0.20 0 0);
  --text-secondary: oklch(0.50 0 0);
  --text-light: oklch(0.95 0 0);
  --accent-primary: oklch(0.45 0.20 260);
  --accent-secondary: oklch(0.55 0.15 200);
  --border-color: oklch(0.90 0 0);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  /* Shadows */
  --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);
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-slow: 300ms ease-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-secondary);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-primary);
  background: var(--bg-secondary);
}

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

.nav-mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-md);
  background: linear-gradient(135deg, oklch(0.98 0.01 260) 0%, oklch(0.96 0.01 200) 100%);
}

.hero-content {
  max-width: 800px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-label {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(0, 0, 0, 0.05);
  border-radius: 9999px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.hero-links {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.hero-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

.hero-links a:hover {
  background: var(--accent-primary);
  color: white;
  transform: translateY(-2px);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  font-size: var(--font-size-base);
}

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

.btn-primary:hover {
  background: var(--accent-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

/* Sections */
.section {
  padding: var(--spacing-2xl) var(--spacing-md);
}

.section-dark {
  background: var(--bg-secondary);
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-3xl);
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

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

.highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.highlight-card {
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all var(--transition-base);
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.highlight-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.highlight-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.highlight-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* Expertise Grid */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.expertise-card {
  padding: var(--spacing-lg);
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.expertise-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.expertise-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.expertise-card h3 {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-xl);
}

.expertise-card ul {
  list-style: none;
}

.expertise-card li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
}

.expertise-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: 600;
}

/* Project Featured */
.project-featured {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.project-label {
  font-size: var(--font-size-sm);
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.project-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.project-desc {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.project-details {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.project-details h4 {
  color: var(--accent-primary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.project-details ul {
  list-style: none;
  padding-left: 0;
}

.project-details li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
}

.project-details li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tech-tag {
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-radius: 9999px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

/* Timeline */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 120px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.timeline-date {
  width: 120px;
  flex-shrink: 0;
  font-weight: 600;
  color: var(--accent-primary);
  padding-top: 0.25rem;
}

.timeline-content {
  flex: 1;
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  position: relative;
}

.timeline-content::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid white;
}

.timeline-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: 0.25rem;
}

.timeline-company {
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.timeline-content p {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* Contact Section */
.contact-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.contact-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.contact-info {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  text-align: left;
}

.contact-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  align-items: center;
}

.contact-item svg {
  flex-shrink: 0;
  color: var(--accent-primary);
}

.contact-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.contact-item a {
  color: var(--text-primary);
  font-weight: 500;
}

.contact-cta {
  margin-top: var(--spacing-xl);
}

/* Footer */
.footer {
  padding: var(--spacing-lg) var(--spacing-md);
  background: var(--bg-dark);
  color: var(--text-light);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-text p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-mobile-toggle {
    display: flex;
  }
  
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .timeline::before {
    left: 0;
  }
  
  .timeline-item {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .timeline-date {
    width: 100%;
  }
  
  .timeline-content::before {
    left: -20px;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (min-width: 769px) {
  .about-content {
    grid-template-columns: 1fr;
  }
  
  .project-details {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Print styles */
@media print {
  .nav, .footer, #n8n-chat {
    display: none;
  }
  
  body {
    font-size: 12pt;
  }
  
  .section {
    padding: 1rem 0;
  }
}