调整UI结构，优化密码设置逻辑

static/style.css

@@ -40,14 +40,14 @@ body {
     border: 1px solid rgba(255, 255, 255, 0.06);
     border-radius: 32px;
     box-shadow: 0 40px 80px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.05);
-    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
+    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
     overflow: hidden;
 }
 
 /* 登录态尺寸：800x650 */
 .app-container:not(.is-logged-in) {
-    width: 800px;
-    height: 650px;
+    width: 600px;
+    height: 450px;
 }
 
 /* 登录后尺寸：1600x900（响应式） */
@@ -64,34 +64,34 @@ body {
     flex-direction: column;
     justify-content: center;
     align-items: center;
-    padding: 48px 64px;
+    padding: 32px 48px;
 }
 
 .login-header {
     display: flex;
     align-items: center;
     gap: 12px;
-    margin-bottom: 40px;
+    margin-bottom: 24px;
 }
 
 .login-icon {
-    font-size: 36px;
+    font-size: 28px;
 }
 
 .login-header h1 {
-    font-size: 28px;
+    font-size: 22px;
     font-weight: 300;
-    letter-spacing: 6px;
+    letter-spacing: 4px;
     color: rgba(255, 255, 255, 0.85);
     text-transform: lowercase;
 }
 
 .login-form {
     width: 100%;
-    max-width: 400px;
+    max-width: 340px;
     display: flex;
     flex-direction: column;
-    gap: 20px;
+    gap: 14px;
 }
 
 .input-group {
@@ -108,13 +108,13 @@ body {
 }
 
 .input-group input {
-    height: 56px;
+    height: 44px;
     padding: 0 20px;
     background: rgba(255, 255, 255, 0.04);
     border: 1px solid rgba(255, 255, 255, 0.08);
     border-radius: 12px;
     color: #fff;
-    font-size: 16px;
+    font-size: 14px;
     transition: border-color 0.3s;
     outline: none;
 }
@@ -128,12 +128,12 @@ body {
 }
 
 .login-btn {
-    height: 56px;
-    margin-top: 12px;
+    height: 44px;
+    margin-top: 6px;
     background: linear-gradient(135deg, #63e2b7, #3b9e8a);
     border: none;
     border-radius: 12px;
-    font-size: 16px;
+    font-size: 14px; 
     font-weight: 600;
     color: #0a0a0f;
     cursor: pointer;
@@ -773,4 +773,42 @@ body {
 .btn-confirm:hover {
     transform: scale(1.02);
     box-shadow: 0 4px 16px rgba(99, 226, 183, 0.2);
+}
+
+/* ===== 旋转圈过渡 ===== */
+.loading-ring {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    width: 48px;
+    height: 48px;
+    border: 3px solid rgba(255, 255, 255, 0.04);
+    border-top: 3px solid #63e2b7;
+    border-radius: 50%;
+    animation: spin 0.8s linear infinite;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.3s;
+    z-index: 5;
+}
+
+.loading-ring.visible {
+    opacity: 1;
+}
+
+@keyframes spin {
+    to {
+        transform: translate(-50%, -50%) rotate(360deg);
+    }
+}
+
+/* 主内容默认透明，登录后淡入 */
+.main-panel {
+    opacity: 0;
+    transition: opacity 0.3s ease;
+}
+
+.main-panel.visible {
+    opacity: 1;
 }