body { font-family: 'Malgun Gothic', sans-serif; line-height: 1.6; background: #f4f4f4; padding: 20px; text-align: center; }
.container { max-width: 800px; margin: auto; background: white; padding: 30px; border-radius: 10px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); }
h1 { color: #0056b3; border-bottom: 2px solid #0056b3; padding-bottom: 10px; }
.nav { margin-bottom: 20px; }
.btn { display: inline-block; padding: 10px 20px; background: #6c757d; color: white; text-decoration: none; border-radius: 5px; margin: 5px; }
.btn-home { background: #007bff; }
img, video { max-width: 100%; border: 1px solid #ccc; margin-top: 20px; }