Refactor styles and components for improved UI consistency

- Updated login page layout by removing unnecessary classes.
- Redesigned 404 not found page with new layout and styles.
- Enhanced public pages with consistent font styling and hover effects.
- Improved ranking page header styling for better readability.
- Updated rules page with consistent font and link styles.
- Enhanced statistics page header styling.
- Refined global CSS variables for better theme consistency.
- Updated button styles for improved interaction feedback.
- Enhanced table styles for better readability and interaction.
- Updated Tailwind configuration to include new font families.

src/components/LanguageWarning.astro

@@ -2,7 +2,7 @@
 import {t} from "astro-i18n";
 ---
 
-<div class="bg-yellow-100 border-l-4 border-yellow-500 text-yellow-700 p-4" role="alert">
-    <p class="font-bold">{t("warning.title")}</p>
-    <p>{t("warning.text")}</p>
+<div class="border-l-2 border-amber-500 bg-amber-500/5 p-4" role="alert">
+    <p class="font-bold text-amber-400" style="font-family: 'Barlow Condensed', sans-serif; letter-spacing: 0.1em; text-transform: uppercase;">{t("warning.title")}</p>
+    <p class="text-gray-400 text-sm">{t("warning.text")}</p>
 </div>