body { font-family: sans-serif; background-color: #f4f4f9; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; }
.card { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); text-align: center; width: 300px; }
input { display: block; width: 100%; padding: 10px; margin-bottom: 10px; box-sizing: border-box; }
button { width: 100%; padding: 10px; background-color: #007bff; color: white; border: none; border-radius: 4px; cursor: pointer; margin-top: 5px;}
button:disabled { background-color: #ccc; cursor: not-allowed; }
button.secondary { background-color: #6c757d; }
#app-container { width: 100%; max-width: 600px; position: absolute; top: 0; }
header { background: #333; color: white; padding: 10px 20px; display: flex; justify-content: space-between; align-items: center; }
.main-content { padding: 20px; text-align: center; margin-top: 50px; }