body { font-family: sans-serif; padding: 20px; background: #f9f9ff; }
h1 { font-size: 24px; }
img { max-width: 100%; margin-bottom: 10px; }
label { display: block; margin: 10px 0 5px; }
input { padding: 8px; width: 100%; margin-bottom: 10px; }
.error { color: red; font-weight: bold; }
button { padding: 10px 20px; background: #77c; color: white; border: none; border-radius: 6px; font-size: 16px; }
button:disabled {
    background: #ccc;
}