feat: integrate platform backend and application interfaces

admin/src/pages/Login/index.module.less

@@ -1,26 +1,57 @@
 .loginWrapper {
   height: 100vh;
+  min-height: 100dvh;
   display: flex;
   flex-direction: column;
   background-size: cover;
-  background-position: 100%;
+  background-position: center;
+  background-image: url('../../assets/image/admin-login-background.webp');
+  overflow-x: hidden;
+  overflow-y: auto;
   position: relative;
+  &::before,
+  &::after {
+    content: '';
+    position: absolute;
+    pointer-events: none;
+    z-index: 0;
+  }
+  // The supplied artwork already provides the visual structure; keep the
+  // legacy geometric decorations from competing with its focal subject.
+  &::before,
+  &::after { display: none; }
   &.dark {
     background-color: var(--td-bg-color-page);
-    background-image: url('assets/image/assets-login-bg-black.png');
+    background-image: linear-gradient(rgba(14, 27, 52, 0.72), rgba(14, 27, 52, 0.72)), url('../../assets/image/admin-login-background.webp');
+    &::before { border-color: rgba(111, 146, 255, 0.22); background: rgba(111, 146, 255, 0.08); }
+    &::after { border-color: rgba(102, 212, 174, 0.18); }
   }
   &.light {
-    background-color: white;
-    background-image: url('assets/image/assets-login-bg-white.png');
+    background-color: #f7f9fc;
+    background-image: url('../../assets/image/admin-login-background.webp');
+    &::before { border-color: rgba(54, 91, 220, 0.14); background: rgba(54, 91, 220, 0.045); }
+    &::after { border-color: rgba(35, 161, 125, 0.12); }
   }
+  &::before { width: 58vw; height: 58vw; right: -20vw; top: -25vw; border: 1px solid; border-radius: 34%; transform: rotate(24deg); }
+  &::after { width: 34vw; height: 34vw; right: 12vw; bottom: -21vw; border: 1px solid; border-radius: 50%; }
 }
 
-.loginContainer {
+.loginContent {
   position: absolute;
   top: 22%;
   left: 5%;
-  min-height: 500px;
+  width: min(400px, calc(100vw - 10%));
+  min-height: 0;
   line-height: 22px;
+  z-index: 1;
+  /* 仅负责定位；登录页主体直接落在背景图左侧，不创建卡片层。 */
+  background: none;
+  border: 0;
+  box-shadow: none;
+}
+
+.titleContainer {
+  text-align: left;
 }
 
 .title {
@@ -33,6 +64,7 @@
 
 .subTitle {
   margin-top: 16px;
+  text-align: left;
 }
 
 .tip {
@@ -58,6 +90,34 @@
   left: 5%;
   bottom: 64px;
   color: var(--td-text-color-secondary);
+  z-index: 1;
+}
+
+@media screen and (max-width: 700px) {
+  .loginWrapper {
+    height: 100dvh;
+    min-height: 100dvh;
+    overflow-x: hidden;
+    overflow-y: auto;
+    // Keep the desktop left-side composition; the artwork remains a full-page
+    // background and the form stays directly on its quiet left half.
+    background-position: left center;
+    background-size: auto 100%;
+    background-attachment: initial;
+  }
+
+  .title {
+    font-size: 30px;
+    line-height: 38px;
+  }
+
+  .copyright {
+    right: auto;
+    bottom: 64px;
+    left: 5%;
+    text-align: left;
+  }
+
 }
 
 @media screen and (max-height: 762px) {