style(discover): tighten hero section and restyle search bar

app/(main)/page.tsx

@@ -15,27 +15,30 @@ export default function HomePage() {
 
   return (
     <div className="container mx-auto py-8 px-4 space-y-12">
-      <section className="py-16 md:py-24 text-center">
+      <section className="pb-8 pt-12 lg:pb-12 lg:pt-20 text-center">
         <div className="space-y-8 max-w-3xl mx-auto">
           <div className="space-y-4">
-            <h1 className="text-4xl md:text-6xl font-bold tracking-tighter leading-tight">
+            <h1
+              className="mb-3 text-3xl font-bold tracking-tight text-foreground lg:text-5xl"
+              style={{ fontFamily: "'Space Grotesk', sans-serif" }}
+            >
               找到你的<span className="text-primary">游戏搭档</span>
             </h1>
-            <p className="text-lg md:text-xl text-muted-foreground leading-relaxed">
+            <p className="mb-8 text-base text-muted-foreground lg:text-lg">
               找人一起打游戏，从这里开始
             </p>
           </div>
 
           <div id="discover-search" className="w-full max-w-2xl mx-auto">
-            <form method="get" action="/search" className="relative flex items-center w-full">
+            <form action="/search" className="relative flex items-center w-full max-w-xl mx-auto">
               <Search className="absolute left-4 h-5 w-5 text-muted-foreground z-10" />
               <Input
                 type="text"
                 name="q"
                 placeholder="搜索陪玩、店铺、游戏..."
-                className="w-full h-14 pl-12 pr-32 rounded-full text-base shadow-sm bg-background"
+                className="w-full h-12 pl-12 pr-24 rounded-xl border-border bg-card text-base shadow-[var(--shadow-card)] transition-shadow focus:shadow-[var(--shadow-card-hover)]"
               />
-              <Button type="submit" size="lg" className="absolute right-1.5 rounded-full px-8 h-11">
+              <Button type="submit" className="absolute right-1.5 rounded-lg px-6 h-9">
                 搜索
               </Button>
             </form>