:root {
  --bg: #f5f7fa;
  --text: #333;
  --card: white;
  --primary: #2563eb;
}

body.dark {
  --bg: #0f172a;
  --text: #e5e7eb;
  --card: #1e293b;
  --primary: #38bdf8;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: all 0.3s ease;
}

.hero {
  background: var(--card);
  text-align: center;
  padding: 50px 20px;
}

.profile-img {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary);
  margin-bottom: 15px;
}

.section {
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
  background: var(--card);
  border-radius: 10px;
}

.section h2 {
  border-bottom: 2px solid var(--primary);
  display: inline-block;
  margin-bottom: 15px;
}

.skills span {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 6px 12px;
  margin: 5px;
  border-radius: 6px;
  font-size: 0.9rem;
}

.contact a {
  color: var(--primary);
  text-decoration: none;
}

footer {
  text-align: center;
  padding: 20px;
  opacity: 0.7;
}

/* Dark mode button */
.theme-toggle {
  position: fixed;
  top: 15px;
  right: 15px;
  border: none;
  background: var(--primary);
  color: white;
  padding: 10px 14px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
}