fix: adjust canvas layout after nav removal

Move canvas floating panels up and align logo/icon styling with the left rail navigation.

app/canvas/[id]/page.tsx

@@ -459,7 +459,7 @@ export default function CanvasEditorPage({ params }: PageProps) {
         </div>
 
         {/* 2. Floating Header (Top Left) */}
-        <div className="absolute top-16 left-4 z-20 flex items-center gap-2 bg-background/80 backdrop-blur-md border rounded-xl p-1.5 shadow-sm">
+        <div className="absolute top-4 left-4 z-20 flex items-center gap-2 bg-background/80 backdrop-blur-md border rounded-xl p-1.5 shadow-sm">
            <Tooltip>
              <TooltipTrigger asChild>
                <Button variant="ghost" size="icon" onClick={() => router.push('/')} className="rounded-lg h-8 w-8">
@@ -510,7 +510,7 @@ export default function CanvasEditorPage({ params }: PageProps) {
 
         {/* 3. Floating Actions (Top Right) */}
         {!isPanelOpen && (
-          <div className="absolute top-16 right-4 z-20 flex items-center gap-2">
+          <div className="absolute top-4 right-4 z-20 flex items-center gap-2">
              <div className="bg-background/80 backdrop-blur-md border rounded-xl p-1.5 shadow-sm flex items-center gap-1">
                 {/* Panel Toggle */}
                 <Tooltip>
@@ -532,7 +532,7 @@ export default function CanvasEditorPage({ params }: PageProps) {
 
         {/* 4. Floating Sidebar (Right) */}
         <div className={cn(
-            "absolute top-16 right-4 bottom-4 z-10 w-[400px] transition-all duration-300 ease-in-out",
+            "absolute top-4 right-4 bottom-4 z-10 w-[400px] transition-all duration-300 ease-in-out",
             isPanelOpen ? "translate-x-0 opacity-100" : "translate-x-[120%] opacity-0 pointer-events-none"
         )}>
             <div className="h-full w-full rounded-2xl border bg-background/95 backdrop-blur-md shadow-2xl overflow-hidden flex flex-col">

components/top-navbar.tsx

@@ -121,8 +121,10 @@ export function TopNavbar({
     }
   };
 
-  // 决定显示哪个 LOGO
+  // 决定显示哪个 LOGO（浅色用普通，深色用暗色）
-  const displayLogo = (siteLogoDark && siteLogoDark.trim() !== "") ? siteLogoDark : siteLogo;
+  const displayLogo = resolvedTheme === "dark"
+    ? (siteLogoDark && siteLogoDark.trim() !== "" ? siteLogoDark : siteLogo)
+    : (siteLogo && siteLogo.trim() !== "" ? siteLogo : siteLogoDark);
 
   const getShortLabel = (label: string) => {
     const trimmed = label.trim();
@@ -309,7 +311,7 @@ export function TopNavbar({
             window.location.href = "/featured";
           }}
         >
-          <Sparkles className="h-5 w-5 text-yellow-400" />
+          <Sparkles className="h-5 w-5" />
           <span className={navLabelClass}>{getShortLabel("AI精选")}</span>
         </a>
 
@@ -324,7 +326,7 @@ export function TopNavbar({
                 type="button"
                 title="功能教程"
               >
-                <PlayCircle className="h-5 w-5 text-green-400" />
+                <PlayCircle className="h-5 w-5" />
                 <span className={navLabelClass}>{getShortLabel("功能教程")}</span>
               </Button>
             </DropdownMenuTrigger>
@@ -383,7 +385,7 @@ export function TopNavbar({
                 type="button"
                 title="精选榜单"
               >
-                <Trophy className="h-5 w-5 text-orange-400" />
+                <Trophy className="h-5 w-5" />
                 <span className={navLabelClass}>{getShortLabel("精选榜")}</span>
               </Button>
             </DropdownMenuTrigger>
@@ -453,7 +455,7 @@ export function TopNavbar({
           type="button"
           title="无限画布"
         >
-          <LayoutGrid className="h-5 w-5 text-purple-400" />
+          <LayoutGrid className="h-5 w-5" />
           <span className={navLabelClass}>{getShortLabel("无限画布")}</span>
         </button>