body {
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(120deg, #222 0%, #fff 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background 0.5s ease;
}

.login-container {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.15), 0 2px 8px rgba(50, 50, 50, 0.11);
    border-radius: 1.6rem;
    padding: 44px 30px 36px 30px;
    width: 370px;
    max-width: 91vw;
    text-align: center;
    backdrop-filter: blur(18px) saturate(122%);
    -webkit-backdrop-filter: blur(18px) saturate(122%);
    border: 1.5px solid rgba(30,30,30,0.12);
    margin: 16px 0;
    animation: fadeIn 0.9s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(24px);}
    to { opacity: 1; transform: translateY(0);}
}

.login-container img {
    width: 108px;
    margin-bottom: 22px;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.10));
    border-radius: 10px;
}

.login-container h2 {
    margin-bottom: 28px;
    color: #181818;
    font-weight: 700;
    font-size: 2.1rem;
    letter-spacing: .5px;
    text-shadow: 0 1px 10px rgba(30,30,30,0.07);
}

.login-container .form-control {
    background-color: #fff;
    border: none;
    box-shadow: 0 0 0 1.5px #22222212;
    padding: 14px 16px;
    font-size: 1.08rem;
    border-radius: 8px;
    margin-bottom: 18px;
    transition: box-shadow 0.25s, border-color 0.17s;
    color: #181818;
}
.login-container .form-control:focus {
    outline: none;
    background-color: #e9e9e9;
    box-shadow: 0 0 9px 0 #22222225;
    border: 1.5px solid #111;
}

.login-container .btn-primary {
    background: linear-gradient(90deg, #111 0%, #333 100%);
    border: none;
    padding: 13px 0;
    font-size: 1.09rem;
    border-radius: 8px;
    font-weight: 600;
    width: 100%;
    color: #fff;
    letter-spacing: .7px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.09);
    transition: background 0.22s, transform 0.17s;
}

.login-container .btn-primary:hover, 
.login-container .btn-primary:focus {
    background: linear-gradient(90deg, #333 0%, #000 100%);
    transform: translateY(-1.5px) scale(1.017);
    color: #fff;
}

.login-container .alert, 
.login-container [role="alert"] {
    margin-top: 14px;
    font-size: 1rem;
    padding: 10px 4px;
    background: #f8f8f8;
    border-radius: 6px;
    color: #181818;
    border: 1px solid #ddd;
    font-weight: 500;
    box-shadow: 0 2px 9px 0 #2222220f;
    text-align: center;
}

@media (max-width: 520px) {
    .login-container {
        padding: 18px 8px 22px 8px;
        width: 99vw;
        min-width: unset;
        border-radius: 0 0 16px 16px;
    }
    .login-container img { width: 71px; }
    .login-container h2 { font-size: 1.38rem; margin-bottom: 22px;}
}