body {
    margin: 0;
    padding: 0;
    background: #0d1117;
    font-family: Arial, sans-serif;
    color: #fff;
}

.login-box {
    width: 360px;
    margin: 120px auto;
    padding: 30px;
    background: #161b22;
    border-radius: 12px;
    box-shadow: 0 0 25px rgba(0,0,0,0.4);
}

h2 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 24px;
}

label {
    font-size: 14px;
    display: block;
    margin: 10px 0 5px 0;
}

input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: none;
    outline: none;
    margin-bottom: 10px;
    background: #0d1117;
    color: #fff;
    border: 1px solid #30363d;
}

button {
    width: 100%;
    padding: 10px;
    background: #238636;
    border: none;
    color: white;
    font-size: 15px;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background: #2ea043;
}

.error-box {
    background: #da3633;
    padding: 10px;
    border-radius: 6px;
    text-align: center;
    margin-bottom: 15px;
}