body { font-family: 'Segoe UI', sans-serif; display: flex; flex-direction: column; align-items: center; padding: 20px; background: #f4f7f9; }
.card { background: white; padding: 25px; border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.1); width: 100%; max-width: 500px; text-align: center; }
#video-container { position: relative; width: 300px; height: 300px; background: #000; border-radius: 50%; overflow: hidden; margin: 20px auto; border: 5px solid #ddd; }
video { width: 100%; height: 100%; object-fit: cover; }
.search-section { display: flex; gap: 10px; margin-bottom: 20px; }
input { flex: 1; padding: 12px; border: 2px solid #ddd; border-radius: 8px; }
.btn { padding: 12px 20px; border: none; border-radius: 8px; cursor: pointer; font-weight: bold; }
.btn-search { background: #007bff; color: white; }
.btn-register { background: #28a745; color: white; width: 100%; font-size: 1.2rem; }
.btn:disabled { background: #ccc; }
#info-alumno { margin: 15px 0; padding: 15px; border: 2px dashed #3498db; border-radius: 10px; background: #ebf5fb; }
.nombre-grande { font-size: 1.6rem; font-weight: bold; color: #2c3e50; margin: 0; }
.grupo-grande { font-size: 1.2rem; color: #5dade2; margin: 5px 0; }