body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    background-color: #0d1117; /* Dark background */
}

.container {
    width: 340px;
    padding: 20px;
    background-color: #151b23; /* Darker container background */
    border: 1px solid #30363d; /* Adjusted border for dark theme */
    border-radius: 6px;
    box-shadow: 0 1px 15px rgba(0,0,0,0.2); /* Adjusted shadow for dark theme */
}

.logo {
    display: block;
    margin: 0 auto 20px auto;
    width: 48px; /* Adjust as needed */
    height: 48px; /* Adjust as needed */
}

h1 {
    font-size: 24px;
    font-weight: 300;
    text-align: center;
    margin-bottom: 20px;
    color: #c9d1d9; /* Light grey text for heading */
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    font-size: 14px;
    color: #8b949e; /* Lighter grey for labels */
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: calc(100% - 20px); /* Account for padding */
    padding: 10px;
    font-size: 14px;
    background-color: #0d1117; /* Dark input background */
    color: #c9d1d9; /* Light text in input */
    border: 1px solid #30363d; /* Darker border for inputs */
    border-radius: 6px;
    box-shadow: inset 0 1px 0 rgba(48,54,61,0.5);
}

.form-group input[type="submit"] {
    width: 100%;
    padding: 10px;
    font-size: 14px;
    font-weight: 600;
    color: #ffffff; /* White text on button */
    background-color: #238636; /* Green button, slightly adjusted */
    border: 1px solid #2ea043; /* Green border */
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

.form-group input[type="submit"]:hover {
    background-color: #2ea043; /* Slightly lighter green on hover */
}

.forgot-password {
    float: right;
    font-size: 12px;
    color: #58a6ff; /* Lighter blue for links */
    text-decoration: none;
}

.forgot-password:hover {
    text-decoration: underline;
}

/* Clearfix for form group if needed */
.form-group::after {
    content: "";
    clear: both;
    display: table;
}