重构样式文件：将多个样式文件合并，更新变量命名空间，优化导入结构，提升代码可维护性和一致性。

src/@core/scss/template/_mixins.scss

@@ -1,5 +1,6 @@
 @use "sass:map";
 @use "vuetify/lib/styles/settings" as vuetify_settings;
+@use "@styles/variables/_vuetify.scss" as vuetify;
 
 @mixin avatar-font-sizes($map: $avatar-sizes) {
   @each $sizeName, $multiplier in vuetify_settings.$size-scales {
@@ -11,3 +12,90 @@
     }
   }
 }
+
+@mixin elevation($z, $important: false) {
+  box-shadow: map.get(vuetify.$shadow-key-umbra, $z), map.get(vuetify.$shadow-key-penumbra, $z), map.get(vuetify.$shadow-key-ambient, $z) if($important, !important, null);
+}
+
+@mixin before-pseudo() {
+  position: relative;
+
+  &::before {
+    position: absolute;
+    border-radius: inherit;
+    background: currentcolor;
+    block-size: 100%;
+    content: "";
+    inline-size: 100%;
+    inset: 0;
+    opacity: 0;
+    pointer-events: none;
+  }
+}
+
+@mixin bordered-skin($component, $border-property: "border", $important: false) {
+  #{$component} {
+    box-shadow: none !important;
+    #{$border-property}: 1px solid rgba(var(--v-border-color), var(--v-border-opacity)) if($important, !important, null);
+  }
+}
+
+@mixin selected-states($selector) {
+  #{$selector} {
+    opacity: calc(var(--v-selected-opacity) * var(--v-theme-overlay-multiplier));
+  }
+
+  &:hover
+  #{$selector} {
+    opacity: calc(var(--v-selected-opacity) + var(--v-hover-opacity) * var(--v-theme-overlay-multiplier));
+  }
+
+  &:focus-visible
+  #{$selector} {
+    opacity: calc(var(--v-selected-opacity) + var(--v-focus-opacity) * var(--v-theme-overlay-multiplier));
+  }
+
+  @supports not selector(:focus-visible) {
+    &:focus {
+      #{$selector} {
+        opacity: calc(var(--v-selected-opacity) + var(--v-focus-opacity) * var(--v-theme-overlay-multiplier));
+      }
+    }
+  }
+}
+
+@mixin push-anchors() {
+  :target {
+    scroll-margin-block-start: 90px;
+  }
+}
+
+@mixin xs {
+  @media (width >= 0) and (width <= 599.98px) {
+    @content;
+  }
+}
+
+@mixin sm {
+  @media (width >= 600px) and (width <= 959.98px) {
+    @content;
+  }
+}
+
+@mixin md {
+  @media (width >= 960px) and (width <= 1279.98px) {
+    @content;
+  }
+}
+
+@mixin lg {
+  @media (width >= 1280px) and (width <= 1919.98px) {
+    @content;
+  }
+}
+
+@mixin xl {
+  @media (width >= 1920px) {
+    @content;
+  }
+}