style(welcome): 优化移动端响应式布局和样式细节

public/static/common/css/welcome.css

@@ -10,7 +10,6 @@ p {
 }
 
 .container {
-    width: 100%;
     padding-right: 15px;
     padding-left: 15px;
     margin-right: auto;
@@ -757,20 +756,116 @@ footer a {
     }
 }
 
-@media (max-width:768px) {
+@media (max-width: 768px) {
+    /* Header adjustments */
     header {
-        padding: 10px;
+        padding: 10px 15px;
+        flex-direction: column;
+        align-items: center;
+    }
+
+    .logo-box {
+        width: 100%;
+        justify-content: center;
+        margin-bottom: 10px;
+    }
+
+    header .right {
+        width: 100%;
+        justify-content: center;
+        flex-direction: column;
+    }
+
+    .navbar {
+        margin-right: 0;
+        width: 100%;
+        justify-content: center;
+        flex-wrap: wrap;
+        padding: 5px 0;
+    }
+
+    .navbar-item {
+        margin: 5px 10px !important;
+        font-size: 14px;
+    }
+
+    .github-btns {
+        margin-top: 10px;
+        display: flex;
+        justify-content: center;
+    }
+
+    /* Hero Section */
+    .home-main {
+        margin-top: 40px;
+    }
+
+    .title {
+        padding-bottom: 60px;
+    }
+
+    .title .logo {
+        width: 80px;
+        height: 104px; /* Maintain aspect ratio approx */
+        margin-bottom: 30px;
+        background-size: contain;
+    }
+
+    .title .name {
+        width: 200px;
+        height: 200px;
+        background-size: contain;
+    }
+
+    .title .desc {
+        font-size: 16px;
+        line-height: 26px;
+        padding: 0 20px;
+        margin-bottom: 30px;
+    }
+
+    .title .operation {
+        flex-direction: column;
+        gap: 15px;
+    }
+
+    .title .operation button,
+    .title .operation a {
+        margin-left: 0;
+        width: 80%;
+        max-width: 300px;
+    }
+
+    /* Introduction Section */
+    .introduction {
+        padding: 40px 15px 60px;
+    }
+
+    .part-title .text {
+        font-size: 24px;
+    }
+
+    .introduction .bottom {
+        margin-top: 40px;
     }
 
     .introduction .bottom .item {
-        width: 80%;
+        width: 100%;
+        margin: 15px 0;
     }
 
-    .footer-nav-box {
-        width: 95%;
+    /* Footer */
+    footer {
+        flex-direction: column;
+        padding: 30px 15px;
+        height: auto;
     }
 
-    .footer-proto-box {
-        width: 95%;
+    footer .container {
+        text-align: center;
+    }
+    
+    .footer-nav-box, .footer-proto-box {
+        width: 100%;
     }
 }