body { margin: 0; font-family: Arial, sans-serif; background: #f4f6fb; color: #222; }
header { background: #3b5bdb; color: #fff; padding: 24px; text-align: center; }
main { max-width: 900px; margin: 0 auto; padding: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.card, .message { background: #fff; border-radius: 10px; padding: 16px; box-shadow: 0 2px 6px rgba(0,0,0,.08); }
.message { margin-top: 12px; }
form { display: grid; gap: 8px; max-width: 500px; }
input, textarea, button { padding: 10px; font-size: 15px; border: 1px solid #ccc; border-radius: 6px; }
button { background: #3b5bdb; color: #fff; border: none; cursor: pointer; }
.error { color: #c92a2a; }