feat: カードのデザインを統一

Author: staticWagomU

2025/src/components/KeynoteSpeakers.astro

@@ -10,7 +10,7 @@
       <div class="mx-auto h-1 w-16 bg-emerald-500"></div>
     </div>
     <div
-      class="mx-auto max-w-2xl border border-gray-100 bg-white p-8 text-center"
+      class="mx-auto max-w-2xl rounded-lg border border-emerald-100 bg-card p-8 text-center"
     >
       <svg
         xmlns="http://www.w3.org/2000/svg"

2025/src/components/Schedule.astro

@@ -7,7 +7,7 @@
       <div class="mx-auto h-1 w-16 bg-emerald-500"></div>
     </div>
     <div
-      class="mx-auto max-w-2xl border border-gray-100 bg-white p-8 text-center shadow-sm"
+      class="mx-auto max-w-2xl border border-emerald-100 bg-card p-8 text-center text-card-foreground shadow-sm"
     >
       <svg
         xmlns="http://www.w3.org/2000/svg"

2025/src/components/Venue.astro

@@ -10,8 +10,7 @@ import VenueMap from "@/components/VenueMap.astro";
     </div>
     <div class="grid items-center gap-6 md:grid-cols-2">
       <div
-        class="rounded-lg border bg-card text-card-foreground shadow-sm"
-        data-v0-t="card"
+        class="rounded-lg border border-emerald-100 bg-card text-card-foreground shadow-sm"
       >
         <div class="p-4">
           <h3 class="mb-3 text-lg font-semibold md:text-xl">