:root {
  /* Colors */
  --color-background: #ffffff;
  --color-surface: #fefefe;
  --color-text: #424242;
  --color-text-secondary: #757575;
  --color-primary: #bbdefb;
  --color-primary-hover: #90caf9;
  --color-primary-active: #64b5f6;
  --color-secondary: #f5f5f5;
  --color-secondary-hover: #eeeeee;
  --color-secondary-active: #e0e0e0;
  --color-accent: #e1bee7;
  --color-accent-light: #f3e5f5;
  --color-border: #e8eaf6;
  --color-btn-primary-text: #424242;
  --color-card-border: #f0f0f0;
  --color-gradient-primary: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
  --color-gradient-accent: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
  
  /* Shadows for light theme */
  --shadow-light: 0 2px 8px rgba(187, 222, 251, 0.3);
  --shadow-medium: 0 4px 16px rgba(187, 222, 251, 0.4);
  --shadow-strong: 0 8px 24px rgba(187, 222, 251, 0.5);

  /* Typography */
  --font-family-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  line-height: 1.6;
  overflow-x: hidden;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary-hover);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-active);
}

/* Container layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-16);
  padding-left: var(--space-16);
}

/* Section title styles */
.section-title {
  font-size: 2.5rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--color-text);
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.section-title.animate {
  opacity: 1;
  transform: translateY(0);
}

/* Button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 30px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  box-shadow: var(--shadow-light);
}

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

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

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  transform: translateY(-2px);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand h2 {
  color: var(--color-text);
  font-weight: 600;
  margin: 0;
}

.nav-brand a {
  color: var(--color-text);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

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

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

.nav-link.active {
  color: var(--color-primary-hover);
  font-weight: 600;
}

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

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

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text);
  margin: 2px 0;
  transition: 0.3s;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: var(--color-gradient-primary);
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.geometric-shape {
  position: absolute;
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  top: 20%;
  right: 10%;
  width: 100px;
  height: 100px;
  background: var(--color-accent);
  border-radius: 50%;
  animation-delay: 0s;
}

.shape-2 {
  top: 60%;
  left: 5%;
  width: 80px;
  height: 80px;
  background: var(--color-primary-hover);
  transform: rotate(45deg);
  animation-delay: 2s;
}

.shape-3 {
  top: 40%;
  right: 25%;
  width: 60px;
  height: 60px;
  background: var(--color-accent-light);
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-content {
  text-align: center;
  z-index: 2;
  position: relative;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease 0.3s forwards;
}

.hero-location {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease 0.4s forwards;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease 0.6s forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* About Section */
.about {
  padding: 5rem 0;
  background: var(--color-surface);
}

.about-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto;
}

.profile-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-light);
}

.about-text {
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  max-width: 600px;
}

/* Experience Section */
.experience {
  padding: 5rem 0;
  background: var(--color-gradient-accent);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-primary);
  transform: translateX(-50%);
}

.timeline-item {
  margin-bottom: 3rem;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.timeline-content {
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: var(--shadow-light);
  width: 45%;
  margin-left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: 55%;
}

.timeline-content h3 {
  color: var(--color-text);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.timeline-content h4 {
  color: var(--color-primary-hover);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.timeline-duration {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
}

.timeline-location {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Education Section */
.education {
  padding: 5rem 0;
  background: var(--color-surface);
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.education-card {
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: var(--shadow-light);
  text-align: center;
  transition: all 0.3s ease;
}

.education-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-5px);
}

.education-card h3 {
  color: var(--color-text);
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.education-card h4 {
  color: var(--color-primary-hover);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

/* Skills Section */
.skills {
  padding: 5rem 0;
  background: var(--color-gradient-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.skills-category h3 {
  color: var(--color-text);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  text-align: center;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-item {
  background: white;
  padding: 1rem 1.5rem;
  border-radius: 25px;
  text-align: center;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
}

.skill-item:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-2px);
}

.language-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
  padding: 1rem 1.5rem;
  border-radius: 15px;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
}

.language-item:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-2px);
}

.language-name {
  font-weight: 500;
  color: var(--color-text);
}

.language-level {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.certifications {
  max-width: 800px;
  margin: 0 auto;
}

.certifications h3 {
  color: var(--color-text);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  text-align: center;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.cert-item {
  background: white;
  padding: 1rem;
  border-radius: 10px;
  text-align: center;
  font-size: 0.9rem;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
}

.cert-item:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-2px);
}

/* Contact Section */
.contact {
  padding: 5rem 0;
  background: var(--color-surface);
}

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

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.contact-item {
  text-align: center;
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
}

.contact-item:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-5px);
}

.contact-item h4 {
  color: var(--color-text);
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.contact-item a {
  color: var(--color-primary-hover);
  text-decoration: none;
  transition: color 0.3s ease;
  display: block;
  margin-bottom: 0.5rem;
}

.contact-item a:hover {
  color: var(--color-primary-active);
}

/* Blog specific styles */
.blog-page {
  padding: 5rem 0;
  padding-top: 8rem;
  background: var(--color-background);
}

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

.blog-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.blog-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.blog-post-card {
  background: var(--color-surface);
  border-radius: 15px;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
  overflow: hidden;
}

.blog-post-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-5px);
}

.post-card-content {
  padding: 1.5rem;
}

.post-card-title {
  margin-bottom: 1rem;
  font-size: var(--font-size-xl);
}

.post-card-title a {
  color: var(--color-text);
}

.post-card-excerpt {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.post-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.read-more {
  color: var(--color-primary-hover);
  font-weight: 500;
  transition: color var(--duration-fast) ease;
}

.read-more:hover {
  color: var(--color-primary-active);
}

/* Homepage specific styles */
.quick-links {
  padding: 5rem 0;
  background: var(--color-surface);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.link-card {
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: var(--shadow-light);
  text-align: center;
  transition: all 0.3s ease;
}

.link-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-5px);
}

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

.link-card h3 {
  color: var(--color-text);
  margin-bottom: 1rem;
}

.link-card p {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.link-btn {
  color: var(--color-primary-hover);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.link-btn:hover {
  color: var(--color-primary-active);
}

.contact-cta {
  padding: 5rem 0;
  background: var(--color-gradient-primary);
  text-align: center;
}

.cta-content h2 {
  margin-bottom: 1rem;
  color: var(--color-text);
}

.cta-content p {
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--color-border);
  margin-top: 3rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-info h3 {
  color: var(--color-text);
  margin-bottom: 1rem;
}

.footer-info p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.footer-section h4 {
  color: var(--color-text);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
  font-size: 0.9rem;
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin: 0.25rem 0;
}

.footer-note {
  font-size: 0.8rem;
  opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item::before {
    left: 20px;
  }
  
  .timeline-content {
    width: calc(100% - 60px);
    margin-left: 60px;
  }
  
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: 60px;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
}