后台界面独立

frontend/src/styles/base.css

@@ -81,6 +81,124 @@ a {
   padding: 32px;
 }
 
+.admin-shell {
+  display: grid;
+  min-height: 100vh;
+  grid-template-columns: 260px 1fr;
+  background: #f5f7fb;
+}
+
+.admin-sidebar {
+  display: flex;
+  flex-direction: column;
+  border-right: 1px solid #dfe5ec;
+  background: #111827;
+  padding: 20px 16px;
+  color: #dbe4ee;
+}
+
+.admin-brand {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-height: 44px;
+  color: #ffffff;
+  font-weight: 700;
+}
+
+.admin-nav {
+  display: grid;
+  gap: 6px;
+  margin-top: 28px;
+}
+
+.admin-nav-link {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-height: 42px;
+  border-radius: 8px;
+  padding: 0 12px;
+  color: #b7c3d2;
+}
+
+.admin-nav-link.router-link-active {
+  background: #0f766e;
+  color: #ffffff;
+  font-weight: 600;
+}
+
+.admin-workspace {
+  min-width: 0;
+}
+
+.admin-topbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  min-height: 64px;
+  border-bottom: 1px solid #e4e7ed;
+  background: #ffffff;
+  padding: 0 28px;
+}
+
+.admin-topbar span {
+  display: block;
+  color: #6b7785;
+  font-size: 12px;
+}
+
+.admin-topbar strong {
+  display: block;
+  margin-top: 3px;
+  color: #111827;
+}
+
+.admin-main {
+  min-width: 0;
+  padding: 28px;
+}
+
+.admin-login-shell {
+  display: grid;
+  min-height: 100vh;
+  place-items: center;
+  background:
+    linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(17, 24, 39, 0.08)),
+    #f5f7fb;
+  padding: 24px;
+}
+
+.admin-login-panel {
+  width: min(420px, 100%);
+  border: 1px solid #e4e7ed;
+  border-radius: 8px;
+  background: #ffffff;
+  padding: 28px;
+  box-shadow: 0 20px 60px rgba(17, 24, 39, 0.10);
+}
+
+.admin-login-brand {
+  display: inline-flex;
+  align-items: center;
+  gap: 10px;
+  color: #111827;
+  font-weight: 700;
+}
+
+.admin-login-header {
+  margin: 28px 0 22px;
+}
+
+.admin-login-header h1 {
+  font-size: 30px;
+}
+
+.admin-login-header p:last-child {
+  margin: 10px 0 0;
+  color: #52616f;
+}
+
 .page {
   max-width: 1120px;
 }
@@ -407,6 +525,10 @@ h1 {
     grid-template-columns: 1fr;
   }
 
+  .admin-shell {
+    grid-template-columns: 1fr;
+  }
+
   .sidebar {
     position: sticky;
     top: 0;
@@ -421,10 +543,32 @@ h1 {
     overflow-x: auto;
   }
 
+  .admin-sidebar {
+    position: sticky;
+    top: 0;
+    z-index: 10;
+    border-right: 0;
+    border-bottom: 1px solid #1f2937;
+  }
+
+  .admin-nav {
+    grid-auto-flow: column;
+    grid-auto-columns: max-content;
+    overflow-x: auto;
+  }
+
+  .admin-topbar {
+    padding: 0 16px;
+  }
+
   .main {
     padding: 24px 16px;
   }
 
+  .admin-main {
+    padding: 24px 16px;
+  }
+
   .metric-grid {
     grid-template-columns: 1fr;
   }