body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.login-box {
    margin-top: 5vh;
}

.card {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.card-body {
    padding: 2rem;
}

.form-control {
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    border: 1px solid #ced4da;
}

.form-control:focus {
    border-color: #80bdff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.input-group-text {
    border-radius: 0.5rem 0 0 0.5rem;
    background-color: #f8f9fa;
    border: 1px solid #ced4da;
    border-right: none;
}

.btn-primary {
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-weight: 600;
    background-color: #007bff;
    border-color: #007bff;
}

.btn-primary:hover {
    background-color: #0069d9;
    border-color: #0062cc;
}

.alert {
    border-radius: 0.5rem;
}

.fa-building {
    color: #007bff;
}