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

:root {
  --color-primary: #0a66c2;
  --color-primary-dark: #084d94;
  --color-secondary: #059669;
  --color-accent: #ea580c;
  --color-dark: #1e293b;
  --color-gray: #475569;
  --color-light-gray: #cbd5e1;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-light-gray);
  padding: var(--spacing-sm) 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.05);
}

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

.nav-links a {
  color: var(--color-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.2s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

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

.btn-contact {
  background-color: var(--color-primary);
  color: white !important;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.btn-contact::after {
  display: none;
}

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

.hero {
  margin-top: 80px;
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(10, 102, 194, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-3xl);
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1;
  max-width: 650px;
}

.hero-image {
  flex-shrink: 0;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 4px solid white;
  animation: fadeInRight 0.8s ease;
  transition: transform 0.3s ease;
}

.hero-image:hover {
  transform: scale(1.05);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-tag {
  display: inline-block;
  background-color: var(--color-bg-tertiary);
  color: var(--color-gray);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.6s ease;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
  animation: fadeInUp 0.6s ease 0.1s backwards;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--color-gray);
  margin-bottom: var(--spacing-lg);
  line-height: 1.5;
  animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-gray);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
  animation: fadeInUp 0.6s ease 0.3s backwards;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  animation: fadeInUp 0.6s ease 0.4s backwards;
}

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
}

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

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

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

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

section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  color: var(--color-dark);
  position: relative;
  padding-bottom: var(--spacing-md);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: 2px;
}

.about {
  background-color: var(--color-bg);
}

.skills {
  background-color: var(--color-bg-secondary);
}

.skills-content {
  max-width: 1000px;
}

.skill-category {
  margin-bottom: var(--spacing-xl);
}

.skill-category h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-md);
}

.about-content {
  max-width: 900px;
}

.about-text {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-gray);
  margin-bottom: var(--spacing-lg);
}

.experience {
  background-color: var(--color-bg-secondary);
}

.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-2xl);
  animation: fadeInLeft 0.6s ease;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--spacing-xl) - 6px);
  top: 8px;
  width: 14px;
  height: 14px;
  background-color: var(--color-primary);
  border: 3px solid var(--color-bg-secondary);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.3);
  box-shadow: 0 0 0 6px rgba(10, 102, 194, 0.2);
}

.timeline-content {
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

.timeline-content:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
  gap: var(--spacing-md);
}

.timeline-header h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-xs);
}

.company {
  color: var(--color-gray);
  font-weight: 500;
}

.timeline-date {
  color: var(--color-gray);
  font-size: 0.875rem;
  white-space: nowrap;
  font-weight: 500;
}

.location {
  color: var(--color-gray);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.description {
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.achievements {
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.achievements li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-gray);
  line-height: 1.7;
}

.achievements li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: 700;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.skill-tag {
  display: inline-block;
  background-color: var(--color-bg-tertiary);
  color: var(--color-primary);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.education {
  background-color: var(--color-bg);
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.education-card {
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  animation: fadeInUp 0.6s ease;
}

.education-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

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

.education-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.institution {
  color: var(--color-gray);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.date {
  color: var(--color-gray);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.highlight {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-secondary) 0%, #10b981 100%);
  color: white;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
}

.grade {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
  color: white;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
}

.hobbies {
  background-color: var(--color-bg);
}

.hobbies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.hobby-card {
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  animation: fadeInUp 0.6s ease;
  text-align: center;
}

.hobby-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px) scale(1.02);
}

.hobby-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hobby-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.hobby-description {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-gray);
}

.volunteering {
  background-color: var(--color-bg-secondary);
}

.volunteering-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
}

.volunteering-card {
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  animation: fadeInUp 0.6s ease;
}

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

.volunteering-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-xs);
}

.organization {
  color: var(--color-gray);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.volunteering-card .description {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.contact {
  background: linear-gradient(135deg, var(--color-dark) 0%, #334155 100%);
  color: white;
}

.contact .section-title {
  color: white;
}

.contact .section-title::after {
  background: linear-gradient(90deg, white 0%, rgba(255, 255, 255, 0.5) 100%);
}

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

.contact-text {
  font-size: 1.25rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.9);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
  backdrop-filter: blur(10px);
}

.contact-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.footer {
  background-color: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

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

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

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

@media (max-width: 768px) {
  .hero-wrapper {
    flex-direction: column;
    gap: var(--spacing-xl);
  }

  .hero-image {
    order: -1;
    width: 200px;
    height: 200px;
  }

  .hero-content {
    text-align: center;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .hero-actions {
    flex-direction: column;
    justify-content: center;
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .nav-links a {
    font-size: 0.875rem;
  }

  .timeline {
    padding-left: var(--spacing-lg);
  }

  .timeline-marker {
    left: calc(-1 * var(--spacing-lg) - 6px);
  }

  .timeline-header {
    flex-direction: column;
  }

  .section-title {
    font-size: 2rem;
  }

  .education-grid,
  .volunteering-grid {
    grid-template-columns: 1fr;
  }

  .contact-links {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-2xl) 0;
  }

  section {
    padding: var(--spacing-2xl) 0;
  }
}