:root {
  --bg-color: #fafafa;
  --text-color: #333;
  --header-color: #222;
  --link-color: #007bff;
  --border-color: #ddd;
  --card-bg: #fff;
}

[data-theme="dark"] {
  --bg-color: #222;
  --text-color: #fafafa;
  --header-color: #eee;
  --link-color: #8ab4f8;
  --border-color: #444;
  --card-bg: #333;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  color: var(--header-color);
}

header p {
    margin: 0;
}

nav {
    display: flex;
    gap: 1rem;
}

nav a {
  text-decoration: none;
  color: var(--link-color);
  font-weight: 500;
  transition: color 0.3s;
}

#theme-switcher {
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
}

section {
  margin-bottom: 2rem;
}

h2 {
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 2rem;
}

#projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.project:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.project h3 {
  margin-top: 0;
}

.project a {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
}

#contact-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

footer {
    text-align: center;
    margin-top: 4rem;
    color: #888;
}