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

:root {
  --primary-bg: #f8f8f8;
  --secondary-bg: #ffffff;
  --accent-color: #000000;
  --accent-hover: #333333;
  --text-primary: #000000;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --success: #10b981;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background-color: var(--primary-bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navigation */
nav {
  background-color: var(--secondary-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.8);
}

nav .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.3s ease;
  display: none;
}

.nav-brand:hover {
  color: var(--accent-hover);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.3s ease;
  position: relative;
}

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

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

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Main Content */
main {
  flex: 1;
  padding: 4rem 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 0;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent-color)or: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero img {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  object-fit: cover;
  margin: 2rem 0;
  border: 3px solid var(--accent-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero img:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* Section Titles */
h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-primary);
  text-align: center;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h6 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.project-card {
  background-color: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.3s ease;
  cursor: pointer;
}

.project-card:hover {
  border-color: var(--accent-color);
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
  transform: translateY(-4px);
}

.project-card h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.project-year {
  font-size: 0.85rem;
  color: var(--accent-color);
  font-weight: 600;
  margin-bottom: 1rem;
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.project-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.project-links a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--accent-color);
  color: var(--primary-bg);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

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

/* Lists */
ul {
  list-style: none;
}

.resource-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.resource-list li:last-child {
  border-bottom: none;
}

.resource-list a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.resource-list a:hover {
  color: var(--accent-hover);
}

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

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-copyright {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: right;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }

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

  h2 {
    font-size: 1.8rem;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-copyright {
    text-align: center;
  }
}

@media (max-width: 480px) {
  nav .container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    width: 100%;
    justify-content: center;
  }

  body {
    padding: 0;
  }

  main {
    padding: 2rem 0;
  }
}