body {
    font-family: system-ui, sans-serif;
    background: #f9fafb;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}
.login-card {
    background: white;
    padding: 2rem;
    border-radius: .75rem;
    box-shadow: 0 2px 10px rgba(0,0,0,.1);
    width: 100%;
    max-width: 360px;
}
h1 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}
label {
    display: block;
    margin-bottom: .5rem;
    font-weight: 600;
}
input {
    width: 100%;
    padding: .6rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: .4rem;
}
button {
    width: 100%;
    background: #007bff;
    color: white;
    border: none;
    padding: .75rem;
    border-radius: .4rem;
    cursor: pointer;
    font-size: 1rem;
}
button:hover {
    background: #0056b3;
}
.error {
    background: #ffe5e5;
    color: #b00000;
    padding: .75rem;
    margin-bottom: 1rem;
    border-radius: .4rem;
    font-size: .9rem;
}