body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.login-container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    width: 320px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    text-align: center;
}

.login-container h2 {
    margin-bottom: 1.5rem;
    color: #333;
}

.form-group {
    margin-bottom: 1rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #555;
}

input {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    width: 100%;
    padding: 0.8rem;
    background: #1e3c72;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background: #2a5298;
}

.error {
    background: #ffdddd;
    color: #d8000c;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #d8000c;
    border-radius: 4px;
}

.error-message {
    background: #ffdddd;
    color: #d8000c;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #d8000c;
    border-radius: 4px;
}

.d-none {
    display: none;
}