/* Reset some basic styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Body style */
body {
    font-family: 'Cairo', sans-serif;
    background-color: #f0f2f5;
    color: #333;
    text-align: center;
}

/* Container style */
.container {
    width: 90%;
    max-width: 600px;
    margin: 50px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

/* Heading style */
h1 {
    color: #007bff;
    margin-bottom: 20px;
    font-size: 28px;
}

h2 {
    color: #333;
    margin-top: 20px;
    font-size: 22px;
}

/* IMEI form style */
.imei-form {
    margin: 20px 0;
}

.imei-form input {
    width: 80%;
    padding: 12px;
    margin: 10px 0;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 18px;
}

.imei-form button {
    padding: 12px 25px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
}

.imei-form button:hover {
    background-color: #218838;
}

/* Result and Error message styles */
.result {
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
    background-color: #e8f9e8;
    color: #388e3c;
}

.result.valid {
    border-left: 5px solid #28a745;
}

.result.expired {
    border-left: 5px solid #dc3545;
}

.error {
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
    background-color: #f8d7da;
    color: #dc3545;
}

/* Instruction styles */
.instruction {
    margin-top: 30px;
}

.imei-image {
    width: 80%;
    max-width: 400px;
    margin: 20px 0;
    border-radius: 8px;
}

/* Responsive design */
@media (max-width: 600px) {
    .container {
        width: 100%;
        padding: 10px;
    }
    .imei-form input {
        width: 100%;
    }
}