重构前端公共布局与基础样式

src/assets/main.css

@@ -1,35 +1,45 @@
-@import './base.css';
+@import "./base.css";
 
 #app {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  font-weight: normal;
+  width: 100%;
 }
 
-a,
-.green {
+a {
+  color: var(--green-700);
   text-decoration: none;
-  color: hsla(160, 100%, 37%, 1);
-  transition: 0.4s;
-  padding: 3px;
 }
 
-@media (hover: hover) {
-  a:hover {
-    background-color: hsla(160, 100%, 37%, 0.2);
-  }
+a:hover {
+  color: var(--green-800);
 }
 
-@media (min-width: 1024px) {
-  body {
-    display: flex;
-    place-items: center;
-  }
-
-  #app {
-    display: grid;
-    grid-template-columns: 1fr 1fr;
-    padding: 0 2rem;
-  }
+.page-title {
+  margin: 0;
+  font-size: clamp(24px, 3vw, 34px);
+  line-height: 1.2;
+  letter-spacing: 0.4px;
+}
+
+.page-subtitle {
+  margin: 10px 0 0;
+  color: var(--text-secondary);
+  font-size: 15px;
+}
+
+.surface-card {
+  background: var(--surface-strong);
+  border: 1px solid var(--border-soft);
+  border-radius: 18px;
+  box-shadow: var(--shadow-soft);
+}
+
+.fade-up-enter-active,
+.fade-up-leave-active {
+  transition: opacity 0.22s ease, transform 0.22s ease;
+}
+
+.fade-up-enter-from,
+.fade-up-leave-to {
+  opacity: 0;
+  transform: translateY(8px);
 }