body {
    background-image: url('../css/background-web-pengisian.gif');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    position: relative;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.login-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 2rem;
    border: none;
}

.card-header h3 {
    margin: 0;
    font-weight: 600;
    font-size: 1.8rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card-body {
    padding: 2.5rem;
}

.form-floating {
    margin-bottom: 1.5rem;
}

.form-control {
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: rgba(248, 249, 250, 0.8);
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    background: white;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 12px;
    padding: 12px 30px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.error-alert {
    background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
    color: white;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    text-align: center;
    border: none;
    font-weight: 500;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.footer {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #764ba2;
}

/* Responsive Design */
@media (max-width: 768px) {
    .login-container {
        padding: 15px;
        max-width: 95%;
    }
    
    .card-header {
        padding: 1.5rem;
    }
    
    .card-header h3 {
        font-size: 1.5rem;
    }
    
    .card-body {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .card-body {
        padding: 1.5rem 1rem;
    }
    
    .card-header {
        padding: 1.2rem;
    }
}