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

body {
    font-family: 'Arial', sans-serif;
    background-color: #121212;
    color: #fff;
}

.login-container {
    background-color: #1e1e1e;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    width: 400px;
    margin: auto;
    text-align: center;
}

.login-container h2 {
    color: #4CAF50;
    margin-bottom: 30px;
    font-size: 28px;
}

.login-container input {
    width: 100%;
    padding: 14px;
    margin-bottom: 20px;
    background-color: #333;
    border: 1px solid #444;
    color: #fff;
    border-radius: 8px;
    font-size: 16px;
}

.login-container button {
    width: 100%;
    padding: 14px;
    background-color: #4CAF50;
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 18px;
    cursor: pointer;
    transition: 0.3s ease;
}

.login-container button:hover {
    background-color: #45a049;
}

.login-error {
    color: #e74c3c;
    text-align: center;
    margin-top: 10px;
    display: none;
}

.wrapper {
    display: flex;
    width: 100%;
    max-width: 1200px;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #1e1e1e;
    padding-top: 30px;
    position: fixed;
    left: -250px;
    top: 0;
    transition: 0.3s;
    height: 100%;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.5);
}

.sidebar.open {
    left: 0;
}

.sidebar h2 {
    color: #4CAF50;
    text-align: center;
    font-size: 24px;
    margin-bottom: 30px;
}

.sidebar a {
    display: block;
    color: #bbb;
    text-decoration: none;
    padding: 15px 25px;
    margin: 5px 0;
    font-size: 18px;
    border-radius: 5px;
    transition: 0.3s ease;
}

.sidebar a:hover {
    background-color: #4CAF50;
    color: #fff;
}

.sidebar a.active {
    background-color: #4CAF50;
    color: #fff;
}

.main-content {
    flex-grow: 1;
    margin-left: 250px;
    padding: 50px;
    overflow-y: auto;
}

.sms-form-container {
    background-color: #1e1e1e;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.sms-form-container h2 {
    color: #4CAF50;
    margin-bottom: 30px;
    font-size: 30px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}