* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.message {
    padding: 15px;
    border-radius: 10px;
    margin: 10px 0;
    text-align: center;
}

.message-error {
    background: #f8d7da;
    color: #721c24;
}

.message-success {
    background: #d4edda;
    color: #155724;
}

.btn {
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}