Refine storyline rail to minimalist arrow layout

components/post-storyline-nav.tsx

@@ -1,6 +1,5 @@
 import Link from 'next/link';
 import type { Post } from 'contentlayer/generated';
-import { siteConfig } from '@/lib/config';
 
 interface Props {
   current: Post;
@@ -12,8 +11,8 @@ interface StationConfig {
   key: 'older' | 'current' | 'newer';
   label: string;
   post?: Post;
-  hint: string;
   rel?: 'prev' | 'next';
+  subtitle: string;
 }
 
 export function PostStorylineNav({ current, newer, older }: Props) {
@@ -22,32 +21,33 @@ export function PostStorylineNav({ current, newer, older }: Props) {
       key: 'older',
       label: '上一站',
       post: older,
-      hint: older ? `發表於 ${formatDate(older.published_at)}` : '沒有更早的文章',
+      subtitle: older ? '回顧這篇' : '到達起點',
       rel: 'prev'
     },
     {
       key: 'current',
       label: '你在這裡',
       post: current,
-      hint: current.published_at ? formatDate(current.published_at) : '草稿'
+      subtitle: '正在閱讀'
     },
     {
       key: 'newer',
       label: '下一站',
       post: newer,
-      hint: newer ? `發表於 ${formatDate(newer.published_at)}` : '還沒有新文章',
+      subtitle: newer ? '繼續前往' : '尚無新章',
       rel: 'next'
     }
   ];
 
   return (
     <nav aria-label="文章導覽" className="relative mt-10">
-      <div className="relative overflow-hidden rounded-[32px] border border-slate-200/70 bg-gradient-to-r from-white via-slate-50 to-white p-6 shadow-lg dark:border-slate-800/70 dark:from-slate-900 dark:via-slate-900/80 dark:to-slate-900">
-        <div className="pointer-events-none absolute inset-0 opacity-60">
-          <div className="absolute left-6 right-6 top-1/2 hidden h-px -translate-y-1/2 bg-gradient-to-r from-transparent via-blue-500/30 to-transparent md:block" />
-          <div className="absolute left-1/2 top-1/2 hidden h-56 w-56 -translate-x-1/2 -translate-y-1/2 rounded-full bg-blue-500/15 blur-3xl dark:bg-blue-400/15 md:block" />
+      <div className="relative overflow-hidden rounded-[32px] border border-slate-200/70 bg-gradient-to-r from-white via-slate-50 to-white px-6 py-10 shadow-lg dark:border-slate-800/70 dark:from-slate-900 dark:via-slate-900/80 dark:to-slate-900">
+        <div className="pointer-events-none absolute inset-x-10 top-1/2 hidden -translate-y-1/2 items-center gap-3 text-slate-300 dark:text-slate-600 md:flex">
+          <span className="h-0 w-0 border-y-[7px] border-y-transparent border-r-[14px] border-r-current" />
+          <span className="flex-1 border-t border-dashed border-current" />
+          <span className="h-0 w-0 rotate-180 border-y-[7px] border-y-transparent border-r-[14px] border-r-current" />
         </div>
-        <div className="relative grid gap-6 md:grid-cols-3">
+        <div className="relative grid gap-8 md:grid-cols-3">
           {stations.map((station) => (
             <Station key={station.key} station={station} />
           ))}
@@ -58,23 +58,17 @@ export function PostStorylineNav({ current, newer, older }: Props) {
 }
 
 function Station({ station }: { station: StationConfig }) {
-  const { post, label, hint, key, rel } = station;
+  const { post, label, rel, subtitle, key } = station;
   const isCurrent = key === 'current';
 
-  const base = `group flex flex-col gap-3 rounded-3xl px-4 py-5 transition duration-300 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-400/60 dark:focus-visible:ring-blue-300/70 ${
-    isCurrent
-      ? 'bg-white/80 shadow-md ring-1 ring-blue-200/60 dark:bg-slate-900/80 dark:ring-blue-500/20'
-      : 'bg-white/60 shadow-sm hover:-translate-y-0.5 hover:shadow-lg dark:bg-slate-900/70'
-  }`;
-
-  const circle = (
+  const capsule = (
     <span
-      className={`flex h-12 w-12 items-center justify-center rounded-full border text-xs font-semibold uppercase tracking-[0.3em] ${
+      className={`flex h-14 w-14 items-center justify-center rounded-full border-2 text-[11px] font-semibold uppercase tracking-[0.35em] transition duration-300 ${
         isCurrent
-          ? 'border-blue-500 bg-blue-500 text-white shadow-[0_0_0_8px_rgba(59,130,246,0.15)]'
+          ? 'border-blue-500 bg-blue-500 text-white shadow-[0_0_20px_rgba(59,130,246,0.35)]'
           : post
             ? 'border-slate-300 bg-white text-slate-500 dark:border-slate-700 dark:bg-slate-900'
-            : 'border-dashed border-slate-300 text-slate-300 dark:border-slate-700'
+            : 'border-dashed border-slate-300 text-slate-400 dark:border-slate-700'
       }`}
     >
       {label === '下一站' ? 'NEXT' : label === '上一站' ? 'PREV' : 'NOW'}
@@ -83,40 +77,33 @@ function Station({ station }: { station: StationConfig }) {
 
   if (!post) {
     return (
-      <div className={`${base} cursor-default opacity-60`}> 
-        {circle}
-        <p className="text-sm text-slate-500 dark:text-slate-400">{hint}</p>
+      <div className="flex flex-col items-center gap-3 text-center text-slate-400">
+        {capsule}
+        <p className="text-xs tracking-[0.35em] uppercase">{label}</p>
+        <p className="text-base font-semibold text-slate-400">{subtitle}</p>
       </div>
     );
   }
 
   return (
-    <Link href={post.url} rel={rel} className={`${base} text-slate-900 dark:text-slate-100`}>
-      <div className="flex items-center gap-4">
-        {circle}
-        <div className="text-xs uppercase tracking-[0.35em] text-slate-400 dark:text-slate-500">
+    <Link
+      href={post.url}
+      rel={rel}
+      className="group flex flex-col items-center gap-3 text-center text-slate-900 transition duration-300 hover:-translate-y-1 hover:text-blue-600 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-400 dark:text-slate-50"
+    >
+      <span className="relative flex items-center">
+        {capsule}
+        <span className={`absolute inset-x-2 top-full mt-2 h-1 rounded-full transition ${isCurrent ? 'bg-blue-500/70' : 'bg-transparent group-hover:bg-blue-400/60'}`} />
+      </span>
+      <p className="text-[11px] uppercase tracking-[0.4em] text-slate-400 dark:text-slate-500">
         {label}
-        </div>
-      </div>
-      <p className="text-lg font-semibold leading-snug tracking-tight text-slate-900 transition-colors group-hover:text-blue-600 dark:text-slate-50 dark:group-hover:text-blue-300">
+      </p>
+      <p className="text-lg font-semibold leading-snug tracking-tight">
         {post.title}
       </p>
-      <div className="flex items-center justify-between text-xs text-slate-500 dark:text-slate-400">
-        <span>{hint}</span>
-        <span className="text-sm font-medium text-blue-600 opacity-0 transition group-hover:opacity-100 dark:text-blue-400">
-          {label === '下一站' ? '→ 前往' : label === '上一站' ? '回顧 ←' : '正在閱讀'}
+      <span className="text-xs text-slate-500 transition group-hover:text-blue-500 dark:text-slate-400">
+        {subtitle}
       </span>
-      </div>
     </Link>
   );
 }
-
-function formatDate(input?: string | Date) {
-  if (!input) return '';
-  const date = input instanceof Date ? input : new Date(input);
-  return date.toLocaleDateString(siteConfig.defaultLocale ?? 'zh-TW', {
-    year: 'numeric',
-    month: '2-digit',
-    day: '2-digit'
-  });
-}