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

body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; background: #fefefe; }

/* Header */
header { text-align: center; padding: 2em; background: #1a1a1a; color: #fff; }
header nav { margin-top: 1em; }
header nav a { margin: 0 1em; text-decoration: none; color: #ffd700; font-weight: bold; transition: 0.3s; }
header nav a:hover { color: #fff; }

/* Main content */
main { max-width: 1000px; margin: 2em auto; padding: 0 1em; }

/* Sections */
section { margin-bottom: 4em; }
section h2 { font-size: 2em; margin-bottom: 1em; border-bottom: 2px solid #ffd700; display: inline-block; padding-bottom: 0.2em; }

/* Project cards */
.project-card {
  border: 1px solid #ddd;
  padding: 1em;
  margin: 1em 0;
  border-radius: 8px;
  background: #fff;
  transition: transform 0.2s, box-shadow 0.2s;
}
.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.project-card h3 { margin-bottom: 0.5em; color: #1a1a1a; }
.project-card p { color: #555; }

/* Footer */
footer { text-align: center; padding: 2em; background: #1a1a1a; color: #fff; }
hr { border: 0; height: 1px; background: #ddd; margin: 2em 0; }

/* 반응형 */
@media (max-width: 768px) {
  header nav { display: flex; flex-direction: column; gap: 0.5em; }
  section h2 { font-size: 1.5em; }
}