body {
    background: url('/images/pipes_background.png') center/cover no-repeat fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 0;
}
.login-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
    max-width: 420px;
    width: 100%;
}
.login-header {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    color: white;
    padding: 2rem;
    border-radius: 16px 16px 0 0;
    text-align: center;
}
.login-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.login-header p {
    opacity: 0.9;
    margin-bottom: 0;
}
.login-body {
    padding: 2rem;
}
.form-control {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    border: 2px solid #e9ecef;
}
.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
}
.input-group-text {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-right: none;
    border-radius: 8px 0 0 8px;
}
.input-group .form-control {
    border-left: none;
    border-radius: 0 8px 8px 0;
}
.btn-login {
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 8px;
    width: 100%;
}
.alert {
    border-radius: 8px;
}