Introduce env-driven accent color system and apply to links, icons, and tags

components/hero.tsx

@@ -78,9 +78,9 @@ export function Hero() {
                   href={item.href}
                   target="_blank"
                   rel="noopener noreferrer"
-                  className="flex items-center gap-2 rounded-full bg-white/80 px-3 py-1 shadow-sm ring-1 ring-slate-200 hover:bg-slate-50 dark:bg-slate-900/80 dark:ring-slate-700"
+                  className="flex items-center gap-2 rounded-full bg-white/80 px-3 py-1 shadow-sm ring-1 ring-slate-200 hover:bg-accent-soft dark:bg-slate-900/80 dark:ring-slate-700"
                 >
-                  <FontAwesomeIcon icon={item.icon} className="h-3.5 w-3.5" />
+                  <FontAwesomeIcon icon={item.icon} className="h-3.5 w-3.5 text-accent" />
                   <span>{item.label}</span>
                 </a>
               ))}

components/post-list-item.tsx

@@ -15,14 +15,6 @@ export function PostListItem({ post }: Props) {
   const excerpt =
     post.description || post.custom_excerpt || post.body?.raw?.slice(0, 120);
 
-  const tagColorClasses = [
-    'bg-rose-100 text-rose-700 dark:bg-rose-900/60 dark:text-rose-200',
-    'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/60 dark:text-emerald-200',
-    'bg-sky-100 text-sky-700 dark:bg-sky-900/60 dark:text-sky-200',
-    'bg-amber-100 text-amber-700 dark:bg-amber-900/60 dark:text-amber-200',
-    'bg-violet-100 text-violet-700 dark:bg-violet-900/60 dark:text-violet-200'
-  ];
-
   return (
     <li>
       <article className="group flex gap-4 rounded-lg border border-slate-200/70 bg-white/80 p-4 transition hover:bg-slate-50 dark:border-slate-800 dark:bg-slate-900/80 dark:hover:bg-slate-900">
@@ -44,26 +36,22 @@ export function PostListItem({ post }: Props) {
               )}
             </p>
           )}
-          <h2 className="text-base font-semibold leading-snug text-slate-900 group-hover:text-blue-600 sm:text-lg dark:text-slate-50 dark:group-hover:text-blue-400">
+          <h2 className="text-base font-semibold leading-snug text-slate-900 hover:text-accent sm:text-lg dark:text-slate-50 dark:hover:text-accent">
             <Link href={post.url}>{post.title}</Link>
           </h2>
           {post.tags && post.tags.length > 0 && (
             <div className="flex flex-wrap gap-2 pt-0.5">
-              {post.tags.slice(0, 4).map((t, i) => {
-                const color =
-                  tagColorClasses[i % tagColorClasses.length];
-                return (
-                  <Link
-                    key={t}
-                    href={`/tags/${encodeURIComponent(
-                      t.toLowerCase().replace(/\s+/g, '-')
-                    )}`}
-                    className={`rounded-full px-2 py-0.5 text-[11px] transition ${color}`}
-                  >
-                    #{t}
-                  </Link>
-                );
-              })}
+              {post.tags.slice(0, 4).map((t) => (
+                <Link
+                  key={t}
+                  href={`/tags/${encodeURIComponent(
+                    t.toLowerCase().replace(/\s+/g, '-')
+                  )}`}
+                  className="rounded-full bg-accent-soft px-2 py-0.5 text-[11px] text-accent-textLight transition hover:bg-accent dark:text-accent-textDark"
+                >
+                  #{t}
+                </Link>
+              ))}
             </div>
           )}
           {excerpt && (

components/right-sidebar.tsx

@@ -59,7 +59,7 @@ export function RightSidebar() {
               )}
             </Link>
             {socialItems.length > 0 && (
-              <div className="flex items-center gap-3 text-base text-slate-500 dark:text-slate-400">
+              <div className="flex items-center gap-3 text-base text-accent-textLight dark:text-accent-textDark">
                 {socialItems.map((item) => (
                   <a
                     key={item.key}
@@ -67,7 +67,7 @@ export function RightSidebar() {
                     target="_blank"
                     rel="noopener noreferrer"
                     aria-label={item.label}
-                    className="transition hover:text-slate-800 dark:hover:text-slate-100"
+                    className="transition hover:text-accent"
                   >
                     <FontAwesomeIcon icon={item.icon} className="h-4 w-4" />
                   </a>
@@ -121,7 +121,7 @@ export function RightSidebar() {
             <div className="mt-2 text-right text-[11px]">
               <Link
                 href="/tags"
-                className="text-slate-500 hover:text-blue-600 dark:text-slate-400 dark:hover:text-blue-400"
+                className="text-slate-500 hover:text-accent dark:text-slate-400 dark:hover:text-accent"
               >
                 查看全部標籤 →
               </Link>

components/theme-toggle.tsx

@@ -20,7 +20,7 @@ export function ThemeToggle() {
   return (
     <button
       type="button"
-      className="inline-flex h-8 w-8 items-center justify-center rounded-full text-slate-500 transition hover:bg-slate-100 hover:text-slate-800 dark:text-slate-400 dark:hover:bg-slate-800 dark:hover:text-slate-100"
+      className="inline-flex h-8 w-8 items-center justify-center rounded-full text-accent-textLight transition hover:bg-accent-soft hover:text-accent dark:text-accent-textDark dark:hover:bg-slate-800 dark:hover:text-accent"
       onClick={() => setTheme(next)}
       aria-label={theme === 'dark' ? '切換為淺色主題' : '切換為深色主題'}
     >