html, body {
    min-height: 100vh;
    background: #f5f6fa;
}

.login-card-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8f9fa;
    padding: 0;
}

.login-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #fff;
    border-radius: 1.25rem;
    box-shadow: 0 4px 24px rgba(0,0,0,0.13);
    padding: 2.5rem 2.5rem 2rem 2.5rem;
    margin-bottom: 2rem;
    width: 100%;
    max-width: 420px;
    min-width: 320px;
    transition: box-shadow 0.2s;
}

.login-card:focus-within {
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

.login-card h4 {
    margin-bottom: 2rem;
    font-size: 2.1rem;
    font-weight: bold;
    text-align: center;
    color: #2d2d2d;
    letter-spacing: 0.02em;
}

.login-card form {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.login-card .form-group {
    width: 100%;
    margin-bottom: 1.5rem;
}

.login-card .form-label {
    font-size: 1.15rem;
    margin-bottom: 0.4rem;
    color: #333;
    font-weight: 500;
}

.login-card .form-control {
    font-size: 1.18rem;
    padding: 0.9rem 1rem;
    border-radius: 0.7rem;
    border: 1.5px solid #d1d5db;
    background: #f8fafc;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-shadow: none;
}
.login-card .form-control:focus {
    border-color: #007bff;
    background: #fff;
    outline: none;
    box-shadow: 0 0 0 2px #cce5ff;
}

.login-card .btn-lg {
    font-size: 1.25rem;
    padding: 0.9rem;
    border-radius: 0.7rem;
    margin-top: 0.5rem;
    width: 100%;
    font-weight: 600;
    letter-spacing: 0.01em;
    box-shadow: 0 2px 8px rgba(0,123,255,0.08);
    transition: background 0.2s, box-shadow 0.2s;
}
.login-card .btn-lg:active {
    background: #0056b3;
    box-shadow: 0 2px 12px rgba(0,123,255,0.18);
}

.login-card .alert {
    font-size: 1.05rem;
    border-radius: 0.7rem;
    margin-top: 1rem;
}

.login-card p.text-center.text-muted {
    font-size: 1.05rem;
    margin-top: 2.2rem;
    color: #6c757d;
    letter-spacing: 0.01em;
}

@media (max-width: 576px) {
    .login-card-container {
        padding: 0;
    }
    .login-card {
        padding: 1.2rem 0.5rem !important;
        min-width: 0 !important;
        max-width: 98vw !important;
        width: 98vw !important;
        border-radius: 1rem !important;
        box-shadow: 0 2px 12px rgba(0,0,0,0.08) !important;
        margin: 0 auto !important;
    }
    .login-card h4 {
        font-size: 1.4rem !important;
        margin-bottom: 1.2rem !important;
    }
    .login-card .form-label, .login-card .form-control, .login-card .btn-lg {
        font-size: 1.08rem !important;
    }
    .login-card .form-control {
        padding: 0.7rem 0.7rem !important;
    }
    .login-card .btn-lg {
        padding: 0.7rem !important;
    }
    .login-card p.text-center.text-muted {
        font-size: 0.98rem !important;
        margin-top: 1.5rem !important;
    }
}