Crush the cookies into fine crumbs, mix with the melted butter, and press firmly into the bottom of a springform pan. Refrigerate for 30 minutes.
Melt the dark chocolate over a double boiler, then let it cool to room temperature.
Whip the heavy cream until stiff peaks form. Add the sugar and vanilla extract, then gently fold in the melted chocolate.
Soak the gelatin sheets in cold water for 5 minutes. Dissolve in a small amount of warm water. Let it cool slightly, then stir it into the chocolate cream.
Pour the chocolate mousse over the prepared cookie base and smooth the top. Refrigerate for 2 hours, or until set.
For the berry mousse, purée the mixed berries and strain to remove the seeds. Fold in the whipped cream and the remaining sugar.
Pour the berry mousse over the chocolate layer and smooth the top. Refrigerate for an additional 3 hours.
Before serving, decorate the cake with fresh berries and chocolate shavings.
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