feat(frontend): update icon, logo and text

4 files changed, 18 insertions, 11 deletions

diff --git a/README.md b/README.md
index 80fea52..da42eee 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,9 @@
 
 # これは何？
 
-2026-03-20 から 2026-03-22 にかけて開催された [PHPerKaigi 2026](https://phperkaigi.jp/2026/) の中の企画、PHPer コードバトルのシステムです。
+2026-03-20 から 2026-03-22 にかけて開催される [PHPerKaigi 2026](https://phperkaigi.jp/2026/) の中の企画、PHPer コードバトルのシステムです。
 
-[サイトはこちら (現在は新規にプレイすることはできません)](https://t.nil.ninja/phperkaigi/2026/code-battle/)
+[サイトはこちら (現在プレイできるのは、予選イベントに参加している方のみです)](https://t.nil.ninja/phperkaigi/2026/code-battle/)
 
 
 # サンドボックス化の仕組み
diff --git a/frontend/app/pages/IndexPage.tsx b/frontend/app/pages/IndexPage.tsx
index 03e135b..7a1da4c 100644
--- a/frontend/app/pages/IndexPage.tsx
+++ b/frontend/app/pages/IndexPage.tsx
@@ -15,18 +15,17 @@ export default function IndexPage() {
 			/>
 			<div className="text-center">
 				<div className="font-bold text-transparent bg-clip-text bg-phperkaigi">
-					<div className="text-6xl">Swift Code Battle</div>
+					<div className="text-6xl">PHPER CODE BATTLE</div>
 				</div>
 			</div>
 			<div className="mx-2">
 				<BorderedContainer>
 					<p className="text-gray-900 max-w-prose">
-						Swift コードバトルは指示された動作をする Swift
-						コードをより短く書けた方が勝ち、という 1 対 1
-						の対戦コンテンツです。9/6
-						に実施された予選を勝ち抜いたプレイヤーによるトーナメント形式での
-						コードバトルを 9/19 (金) day0
-						に実施します。ここでは短いコードが正義です！
+						PHPer コードバトルは指示された動作をする PHP
+						コードをより短く書けた方が勝ち、という 1 対 1 の対戦コンテンツです。
+						3/20 の day 0 と 3/21 の day 1 では、2/28
+						に実施されたオフライン予選と、当日まで開催しているオンライン予選を勝ち抜いたプレイヤーによるトーナメント形式での
+						PHPer コードバトルを実施します。ここでは短いコードが正義です！
 						可読性も保守性も放り投げた、イベントならではのコードをお楽しみください！
 					</p>
 				</BorderedContainer>
diff --git a/frontend/public/favicon.svg b/frontend/public/favicon.svg
index 64bcbbf..379978d 100644
--- a/frontend/public/favicon.svg
+++ b/frontend/public/favicon.svg
@@ -1 +1,4 @@
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diff --git a/frontend/public/logo.svg b/frontend/public/logo.svg
index 643bcff..8ee599e 100644
--- a/frontend/public/logo.svg
+++ b/frontend/public/logo.svg
@@ -1 +1,6 @@
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