body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background: #f5f7fa;
  color: #333;
  transition: background 0.3s, color 0.3s;
}

.dark-mode {
  background: #1e1e1e;
  color: #eee;
}

.dark-mode .section {
  background: #2d2d2d;
  color: #eee;
}

.hero {
  text-align: center;
  background: #34495e;
  color: white;
  padding: 3rem 1rem;
}

.section {
  padding: 2rem 1.5rem;
  margin: auto;
  margin-bottom: 1.5rem;
  max-width: 900px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.project-card {
  padding: 1rem;
  background: #ecf0f1;
  border-left: 4px solid #2980b9;
  border-radius: 6px;
}

.dark-mode .project-card {
  background: #3b3b3b;
  border-color: #00acc1;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #ecf0f1;
}

.dark-mode footer {
  background: #2c2c2c;
}

#darkToggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.5rem 1rem;
  border: none;
  background: #ccc;
  border-radius: 20px;
  cursor: pointer;
  z-index: 999;
}