Add fluid typography scale and responsive headings

app/blog/[slug]/page.tsx

@@ -9,6 +9,8 @@ import { PostToc } from '@/components/post-toc';
 import { ScrollReveal } from '@/components/scroll-reveal';
 import { PostCard } from '@/components/post-card';
 import { PostStorylineNav } from '@/components/post-storyline-nav';
+import { SectionDivider } from '@/components/section-divider';
+import { FooterCue } from '@/components/footer-cue';
 
 export function generateStaticParams() {
   return allPosts.map((post) => ({
@@ -48,77 +50,87 @@ export default function BlogPostPage({ params }: Props) {
           <PostToc />
         </aside>
         <div className="flex-1 space-y-6">
-          <ScrollReveal>
-            <header className="mb-2 space-y-2">
-              {post.published_at && (
-                <p className="text-xs text-slate-500 dark:text-slate-500">
-                  {new Date(post.published_at).toLocaleDateString(
-                    siteConfig.defaultLocale
-                  )}
-                </p>
-              )}
-              <h1 className="text-2xl font-bold leading-tight text-slate-900 sm:text-3xl dark:text-slate-50">
-                {post.title}
-              </h1>
-              {post.tags && (
-                <div className="flex flex-wrap gap-2 pt-1">
-                  {post.tags.map((t) => (
-                    <Link
-                      key={t}
-                      href={`/tags/${encodeURIComponent(
-                        t.toLowerCase().replace(/\s+/g, '-')
-                      )}`}
-                      className="rounded-full bg-accent-soft px-2 py-0.5 text-xs text-accent-textLight transition hover:bg-accent hover:text-white dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700"
-                    >
-                      #{t}
-                    </Link>
-                  ))}
-                </div>
-              )}
-            </header>
-          </ScrollReveal>
+          <SectionDivider>
+            <ScrollReveal>
+              <header className="mb-2 space-y-2">
+                {post.published_at && (
+                  <p className="type-small text-slate-500 dark:text-slate-500">
+                    {new Date(post.published_at).toLocaleDateString(
+                      siteConfig.defaultLocale
+                    )}
+                  </p>
+                )}
+                <h1 className="type-display font-bold leading-tight text-slate-900 dark:text-slate-50">
+                  {post.title}
+                </h1>
+                {post.tags && (
+                  <div className="flex flex-wrap gap-2 pt-1">
+                    {post.tags.map((t) => (
+                      <Link
+                        key={t}
+                        href={`/tags/${encodeURIComponent(
+                          t.toLowerCase().replace(/\s+/g, '-')
+                        )}`}
+                        className="tag-chip rounded-full bg-accent-soft px-2 py-0.5 text-xs text-accent-textLight dark:bg-slate-800 dark:text-slate-100"
+                      >
+                        #{t}
+                      </Link>
+                    ))}
+                  </div>
+                )}
+              </header>
+            </ScrollReveal>
+          </SectionDivider>
 
-          <ScrollReveal>
-            <article className="prose prose-lg prose-slate max-w-none dark:prose-dark">
-              {post.feature_image && (
-                // feature_image is stored as "../assets/xyz", serve from "/assets/xyz"
-                // eslint-disable-next-line @next/next/no-img-element
-                <img
-                  src={post.feature_image.replace('../assets', '/assets')}
-                  alt={post.title}
-                  className="my-4 rounded"
-                />
-              )}
-              <div dangerouslySetInnerHTML={{ __html: post.body.html }} />
-            </article>
-          </ScrollReveal>
+          <SectionDivider>
+            <ScrollReveal>
+              <article className="prose prose-lg prose-slate max-w-none dark:prose-dark">
+                {post.feature_image && (
+                  // feature_image is stored as "../assets/xyz", serve from "/assets/xyz"
+                  // eslint-disable-next-line @next/next/no-img-element
+                  <img
+                    src={post.feature_image.replace('../assets', '/assets')}
+                    alt={post.title}
+                    className="my-4 rounded"
+                  />
+                )}
+                <div dangerouslySetInnerHTML={{ __html: post.body.html }} />
+              </article>
+            </ScrollReveal>
+          </SectionDivider>
 
-          <ScrollReveal>
-            <PostStorylineNav
-              current={post}
-              newer={neighbors.newer}
-              older={neighbors.older}
-            />
-          </ScrollReveal>
+          <FooterCue />
+
+          <SectionDivider>
+            <ScrollReveal>
+              <PostStorylineNav
+                current={post}
+                newer={neighbors.newer}
+                older={neighbors.older}
+              />
+            </ScrollReveal>
+          </SectionDivider>
 
           {relatedPosts.length > 0 && (
-            <ScrollReveal>
-              <section className="space-y-4 rounded-xl border border-slate-200 bg-white/80 p-4 shadow-sm dark:border-slate-800 dark:bg-slate-900/50">
-                <div className="flex items-center justify-between gap-2">
-                  <h2 className="text-base font-semibold text-slate-900 dark:text-slate-50">
-                    相關文章
-                  </h2>
-                  <p className="text-xs text-slate-500 dark:text-slate-400">
-                    為你挑選相似主題
-                  </p>
-                </div>
-                <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
-                  {relatedPosts.map((related) => (
-                    <PostCard key={related._id} post={related} showTags={false} />
-                  ))}
-                </div>
-              </section>
-            </ScrollReveal>
+            <SectionDivider>
+              <ScrollReveal>
+                <section className="space-y-4 rounded-xl border border-slate-200 bg-white/80 p-4 shadow-sm dark:border-slate-800 dark:bg-slate-900/50">
+                  <div className="flex items-center justify-between gap-2">
+                    <h2 className="type-subtitle font-semibold text-slate-900 dark:text-slate-50">
+                      相關文章
+                    </h2>
+                    <p className="type-small text-slate-500 dark:text-slate-400">
+                      為你挑選相似主題
+                    </p>
+                  </div>
+                  <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+                    {relatedPosts.map((related) => (
+                      <PostCard key={related._id} post={related} showTags={false} />
+                    ))}
+                  </div>
+                </section>
+              </ScrollReveal>
+            </SectionDivider>
           )}
         </div>
       </div>

app/blog/page.tsx

@@ -11,10 +11,10 @@ export default function BlogIndexPage() {
   return (
     <section className="space-y-4">
       <header className="space-y-1">
-        <h1 className="text-lg font-semibold text-slate-900 dark:text-slate-50">
+        <h1 className="type-title font-semibold text-slate-900 dark:text-slate-50">
           所有文章
         </h1>
-        <p className="text-xs text-slate-500 dark:text-slate-400">
+        <p className="type-small text-slate-500 dark:text-slate-400">
           繼續往下滑，慢慢逛逛。
         </p>
       </header>

app/page.tsx

@@ -9,17 +9,17 @@ export default function HomePage() {
   return (
     <section className="space-y-6">
       <header className="space-y-1 text-center">
-        <h1 className="text-2xl font-bold text-slate-900 sm:text-3xl dark:text-slate-50">
+        <h1 className="type-title font-bold text-slate-900 dark:text-slate-50">
           {siteConfig.name} 的最新動態
         </h1>
-        <p className="text-sm text-slate-600 dark:text-slate-300">
+        <p className="type-small text-slate-600 dark:text-slate-300">
           {siteConfig.tagline}
         </p>
       </header>
 
       <div>
         <div className="mb-3 flex items-baseline justify-between">
-          <h2 className="text-sm font-semibold uppercase tracking-wide text-slate-500 dark:text-slate-400">
+          <h2 className="type-small font-semibold uppercase tracking-[0.4em] text-slate-500 dark:text-slate-400">
             最新文章
           </h2>
           <Link

app/tags/page.tsx

@@ -21,11 +21,11 @@ export default function TagIndexPage() {
 
   return (
     <section className="space-y-4">
-      <h1 className="flex items-center gap-2 text-lg font-semibold text-slate-900 dark:text-slate-50">
+      <h1 className="type-title flex items-center gap-2 font-semibold text-slate-900 dark:text-slate-50">
         <FontAwesomeIcon icon={faTags} className="h-5 w-5 text-slate-400" />
         標籤索引
       </h1>
-      <p className="text-xs text-slate-500 dark:text-slate-400">
+      <p className="type-small text-slate-500 dark:text-slate-400">
         目前共有 {tags.length} 個標籤。
       </p>
       <div className="flex flex-wrap gap-3 text-xs">
@@ -35,7 +35,7 @@ export default function TagIndexPage() {
             <Link
               key={tag}
               href={`/tags/${slug}`}
-              className={`rounded-full px-3 py-1 shadow-sm transition-transform transition-shadow duration-200 ease-out hover:-translate-y-0.5 hover:shadow-md ${color}`}
+              className={`tag-chip rounded-full px-3 py-1 shadow-sm transition-transform transition-shadow duration-200 ease-out hover:-translate-y-0.5 hover:shadow-md ${color}`}
             >
               <span className="mr-1">{tag}</span>
               <span className="opacity-70">({count})</span>

components/footer-cue.tsx

@@ -0,0 +1,43 @@
+'use client';
+
+import { useEffect, useRef, useState } from 'react';
+
+export function FooterCue() {
+  const ref = useRef<HTMLDivElement | null>(null);
+  const [active, setActive] = useState(false);
+
+  useEffect(() => {
+    const el = ref.current;
+    if (!el) return;
+
+    if (!('IntersectionObserver' in window)) {
+      setActive(true);
+      return;
+    }
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            setActive(true);
+          }
+        });
+      },
+      { threshold: 0.2 }
+    );
+
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, []);
+
+  return (
+    <div ref={ref} className="flex flex-col items-center gap-2 py-4 text-[11px] uppercase tracking-[0.3em] text-slate-400 dark:text-slate-500">
+      <span className="text-xs">即將展開</span>
+      <span
+        className={`h-10 w-px overflow-hidden rounded-full bg-gradient-to-b from-transparent via-accent to-transparent transition-[height,opacity] duration-500 ease-snappy ${
+          active ? 'opacity-80' : 'h-4 opacity-30'
+        }`}
+      />
+    </div>
+  );
+}

components/hero.tsx

@@ -64,11 +64,12 @@ export function Hero() {
       <div className="pointer-events-none absolute -bottom-20 right-[-3rem] h-44 w-44 rounded-full bg-indigo-300/35 blur-3xl mix-blend-soft-light motion-safe:animate-float-soft dark:bg-indigo-500/25" />
 
       <div className="relative flex items-center gap-4 motion-safe:animate-fade-in-up">
-        <div className="flex h-16 w-16 items-center justify-center rounded-full bg-slate-900 text-2xl font-semibold text-slate-50 shadow-md transition-transform duration-300 ease-out group-hover:scale-105 dark:bg-slate-100 dark:text-slate-900">
+        <div className="flex h-16 w-16 items-center justify-center rounded-full bg-slate-900 text-xl font-semibold text-slate-50 shadow-md transition-transform duration-300 ease-out group-hover:scale-105 dark:bg-slate-100 dark:text-slate-900">
           {initial}
         </div>
         <div>
-          <h1 className="text-2xl font-bold tracking-tight sm:text-3xl">
+          <h1 className="hero-title type-display font-bold tracking-tight">
+            <span className="hero-title__sweep" aria-hidden="true" />
             {name}
           </h1>
           <div className="mt-1">

components/right-sidebar.tsx

@@ -103,7 +103,7 @@ export function RightSidebar() {
                   <Link
                     key={tag}
                     href={`/tags/${slug}`}
-                    className={`${sizeClass} rounded-full bg-accent-soft px-2 py-0.5 text-accent-textLight transition hover:bg-accent hover:text-white dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700`}
+                    className={`${sizeClass} tag-chip rounded-full bg-accent-soft px-2 py-0.5 text-accent-textLight transition hover:bg-accent hover:text-white dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700`}
                   >
                     {tag}
                   </Link>

components/section-divider.tsx

@@ -0,0 +1,53 @@
+'use client';
+
+import { useEffect, useRef, useState, ReactNode } from 'react';
+import clsx from 'clsx';
+
+interface SectionDividerProps {
+  children: ReactNode;
+  className?: string;
+}
+
+export function SectionDivider({ children, className }: SectionDividerProps) {
+  const ref = useRef<HTMLDivElement | null>(null);
+  const [visible, setVisible] = useState(false);
+
+  useEffect(() => {
+    const el = ref.current;
+    if (!el) return;
+
+    if (!('IntersectionObserver' in window)) {
+      setVisible(true);
+      return;
+    }
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            setVisible(true);
+          }
+        });
+      },
+      { threshold: 0.15, rootMargin: '0px 0px -20% 0px' }
+    );
+
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, []);
+
+  return (
+    <div
+      ref={ref}
+      className={clsx('space-y-4', className)}
+    >
+      <span
+        className={clsx(
+          'block h-[2px] w-full origin-left rounded-full bg-gradient-to-r from-slate-200 via-accent-soft to-slate-200 transition-transform duration-500 ease-snappy dark:from-slate-800 dark:to-slate-800',
+          visible ? 'scale-x-100 opacity-100' : 'scale-x-50 opacity-30'
+        )}
+      />
+      {children}
+    </div>
+  );
+}

styles/globals.css

@@ -7,10 +7,22 @@
   --motion-duration-medium: 260ms;
   --motion-ease-snappy: cubic-bezier(0.32, 0.72, 0, 1);
   --card-translate-y: -6px;
+  --line-height-body: clamp(1.5, 0.15vw + 1.45, 1.65);
+
+  font-size: clamp(15px, 0.65vw + 11px, 19px);
+}
+
+@media (min-width: 2560px) {
+  :root {
+    font-size: 20px;
+  }
 }
 
 body {
-  @apply bg-white text-gray-900 transition-colors duration-200 ease-snappy dark:bg-gray-950 dark:text-gray-100 text-[15px] sm:text-base;
+  @apply bg-white text-gray-900 transition-colors duration-200 ease-snappy dark:bg-gray-950 dark:text-gray-100;
+  font-size: 1rem;
+  line-height: var(--line-height-body);
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang TC', 'Noto Sans TC', 'Microsoft JhengHei', 'Noto Sans', sans-serif;
 }
 
 .toc-target-highlight {
@@ -34,6 +46,37 @@ body {
   @apply -translate-y-0.5 shadow-md;
 }
 
+.prose {
+  font-size: clamp(1rem, 0.2vw + 0.9rem, 1.2rem);
+  line-height: var(--line-height-body);
+}
+
+.prose h1 {
+  font-size: clamp(2.2rem, 1.4rem + 2.2vw, 3.4rem);
+  line-height: 1.25;
+}
+
+.prose h2 {
+  font-size: clamp(1.8rem, 1.1rem + 1.6vw, 2.8rem);
+  line-height: 1.3;
+}
+
+.prose h3 {
+  font-size: clamp(1.4rem, 0.9rem + 1vw, 2rem);
+  line-height: 1.35;
+}
+
+.prose p,
+.prose li {
+  font-size: clamp(1rem, 0.2vw + 0.9rem, 1.15rem);
+  line-height: var(--line-height-body);
+}
+
+.prose small,
+.prose figcaption {
+  font-size: clamp(0.85rem, 0.2vw + 0.8rem, 0.95rem);
+}
+
 .prose h1 > a,
 .prose h2 > a,
 .prose h3 > a,
@@ -103,6 +146,31 @@ body {
 }
 
 @layer components {
+  .type-display {
+    font-size: clamp(2.2rem, 1.6rem + 2.4vw, 3.5rem);
+    line-height: 1.2;
+  }
+
+  .type-title {
+    font-size: clamp(1.6rem, 1.1rem + 1.4vw, 2.6rem);
+    line-height: 1.3;
+  }
+
+  .type-subtitle {
+    font-size: clamp(1.25rem, 0.9rem + 1vw, 1.9rem);
+    line-height: 1.35;
+  }
+
+  .type-body {
+    font-size: clamp(1rem, 0.2vw + 0.9rem, 1.15rem);
+    line-height: var(--line-height-body);
+  }
+
+  .type-small {
+    font-size: clamp(0.85rem, 0.2vw + 0.8rem, 0.95rem);
+    line-height: 1.4;
+  }
+
   .motion-card {
     transition: transform var(--motion-duration-medium) var(--motion-ease-snappy),
       box-shadow var(--motion-duration-medium) var(--motion-ease-snappy),