:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --accent-color: #007bff;
}

body.dark {
  --bg-color: #1a1a1a;
  --text-color: #f0f0f0;
  --accent-color: #66b2ff;
}

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

body {
  font-family: 'Arial', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  padding-bottom: 50px;
}

header {
  background-color: var(--accent-color);
  color: white;
  padding: 1rem;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
}

nav a {
  color: white;
  text-decoration: none;
}

.hero {
  text-align: center;
  padding: 4rem 1rem;
  background: #f5f5f5;
}

section {
  padding: 2rem 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.project-card {
  background: #e9ecef;
  padding: 1rem;
  margin-top: 1rem;
  border-radius: 8px;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: var(--accent-color);
  color: white;
  position: fixed;
  width: 100%;
  bottom: 0;
}

#theme-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: white;
}