Redmine

This patch updates the visual design of the default theme header to make it lighter and better balanced.

The current header feels visually heavy because the main menu is tightly coupled with the primary blue header area. This makes the header look larger than necessary and gives it a dated impression.

This patch addresses that by giving the main menu its own background color and presenting it as a bar-style navigation area, rather than leaving it visually merged with the blue header background. It also slims down the blue header area and reduces its visual weight. This makes both the header and the main menu easier to scan while keeping the familiar structure of the default theme.

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