diff --git a/style.css b/style.css
index 940369c..13aacdf 100644
--- a/style.css
+++ b/style.css
@@ -1,9 +1,31 @@
+/* ==============================
+ 共通
+============================== */
 body {
   margin: 0;
-  font-family: sans-serif;
+  font-family: "Hiragino Sans", "Helvetica Neue", Arial, sans-serif;
 }
 
-/* index */
+.fadeIn {
+  animation: fadeIn 0.5s ease-out;
+}
+.fadeInUp {
+  animation: fadeInUp 0.6s ease-out;
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
+@keyframes fadeInUp {
+  from { opacity: 0; transform: translateY(20px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+/* ==============================
+ index.html
+============================== */
 body.index-page {
   background: linear-gradient(135deg, #9be2ff, #c7f5d9);
   min-height: 100vh;
@@ -16,44 +38,116 @@
 .index-container {
   width: 90%;
   max-width: 420px;
-  background: #fff;
-  padding: 20px;
-  border-radius: 14px;
-  box-shadow: 0 3px 16px rgba(0,0,0,0.15);
+  padding: 25px;
+  background: white;
+  border-radius: 18px;
+  box-shadow: 0 12px 28px rgba(0,0,0,0.15);
+  text-align: center;
 }
 
-/* map */
+.index-container input[type="text"] {
+  width: 100%;
+  padding: 12px;
+  margin-top: 12px;
+  border-radius: 10px;
+  border: 2px solid #ddd;
+  font-size: 17px;
+}
+
+.start-btn {
+  width: 100%;
+  margin-top: 16px;
+  padding: 12px;
+  border-radius: 10px;
+  background: #4ba3ff;
+  border: none;
+  color: white;
+  font-size: 18px;
+}
+
+/* ==============================
+ map4.html
+============================== */
+
 body.map-page {
-  background: #eef6ff;
-  padding: 15px;
+  background: linear-gradient(135deg, #d7efff, #e8ffef);
+  padding: 20px;
+}
+
+/* 上のカード */
+.map-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.card {
+  background: white;
+  padding: 16px;
+  border-radius: 16px;
+  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
+  margin-bottom: 20px;
+}
+
+/* PC: 横並び / スマホ: 縦並び */
+.map-body {
+  display: flex;
+  flex-direction: column;
+  gap: 20px;
+}
+
+@media (min-width: 900px) {
+  .map-body {
+    flex-direction: row;
+  }
+  .member-area {
+    width: 30%;
+  }
+  .map-area {
+    width: 70%;
+  }
+}
+
+/* 地図（中央ズレ対策） */
+#map-wrapper {
+  padding: 0;
+  margin: 0;
 }
 
 #map {
   width: 100%;
-  height: 480px;
-  border-radius: 10px;
-  box-shadow: 0 3px 12px rgba(0,0,0,0.15);
-}
-
-/* member list */
-.card {
-  padding: 16px;
-  background: #fff;
+  height: 500px;
   border-radius: 14px;
-  box-shadow: 0 3px 12px rgba(0,0,0,0.1);
-  margin-top: 20px;
+  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
 }
 
+/* メンバー一覧 */
 #memberList {
   list-style: none;
   padding: 0;
+  margin: 0;
 }
 
 #memberList li {
-  padding: 10px;
+  padding: 12px;
+  margin-bottom: 12px;
   background: #f2f6ff;
-  margin-bottom: 8px;
+  border-radius: 12px;
   border-left: 5px solid #4ba3ff;
   cursor: pointer;
-  border-radius: 8px;
+  transition: 0.2s;
+}
+
+#memberList li:hover {
+  transform: translateX(4px);
+}
+
+/* 退出ボタン */
+.exit-btn {
+  padding: 8px 14px;
+  background: #ff6b6b;
+  color: white;
+  border: none;
+  border-radius: 10px;
+  cursor: pointer;
 }