Task 5: Build FloatingNav component with active section tracking

- Created useActiveSection hook using IntersectionObserver for scroll tracking
- Built FloatingNav with Framer Motion animated indicator dot
- Added section IDs to App.tsx for scroll targets
- Added scrollbar-hide utility and smooth scroll to index.css

src/App.tsx

@@ -2,6 +2,7 @@ import { useState } from 'react'
 import type { Phase } from './types'
 import { BootSequence } from './components/BootSequence'
 import { ECGAnimation } from './components/ECGAnimation'
+import { FloatingNav } from './components/FloatingNav'
 
 function App() {
   const [phase, setPhase] = useState<Phase>('boot')
@@ -17,24 +18,56 @@ function App() {
       )}
       
       {phase === 'content' && (
-        <main className="max-w-[1000px] mx-auto px-8">
+        <>
-          <section className="min-h-screen flex flex-col justify-center items-center text-center py-20">
+          <FloatingNav />
-            <h1 className="font-primary font-bold text-5xl text-heading">Andy Charlwood</h1>
+          <main className="max-w-[1000px] mx-auto px-8">
-            <p className="text-muted mt-2">Deputy Head of Population Health &amp; Data Analysis</p>
+            <section id="about" className="min-h-screen flex flex-col justify-center items-center text-center py-20">
-            <span className="inline-block mt-2 px-4 py-1 border border-teal rounded-full text-xs text-teal font-medium">
+              <h1 className="font-primary font-bold text-5xl text-heading">Andy Charlwood</h1>
-              Norwich, UK
+              <p className="text-muted mt-2">Deputy Head of Population Health &amp; Data Analysis</p>
-            </span>
+              <span className="inline-block mt-2 px-4 py-1 border border-teal rounded-full text-xs text-teal font-medium">
-            <p className="mt-6 max-w-[560px] text-text">
+                Norwich, UK
-              GPhC Registered Pharmacist specialising in medicines optimisation, population health analytics, and NHS efficiency programmes.
+              </span>
-            </p>
+              <p className="mt-6 max-w-[560px] text-text">
-          </section>
+                GPhC Registered Pharmacist specialising in medicines optimisation, population health analytics, and NHS efficiency programmes.
-          
+              </p>
-          <section className="py-20">
+            </section>
-            <h2 className="font-primary text-2xl font-bold text-heading text-center mb-8">
+            
-              Components will be built in subsequent tasks
+            <section id="skills" className="py-20">
-            </h2>
+              <h2 className="font-primary text-2xl font-bold text-heading text-center mb-8">
-          </section>
+                Skills
-        </main>
+              </h2>
+              <p className="text-muted text-center">Skills section will be built in Task 7</p>
+            </section>
+
+            <section id="experience" className="py-20">
+              <h2 className="font-primary text-2xl font-bold text-heading text-center mb-8">
+                Experience
+              </h2>
+              <p className="text-muted text-center">Experience section will be built in Task 8</p>
+            </section>
+
+            <section id="education" className="py-20">
+              <h2 className="font-primary text-2xl font-bold text-heading text-center mb-8">
+                Education
+              </h2>
+              <p className="text-muted text-center">Education section will be built in Task 9</p>
+            </section>
+
+            <section id="projects" className="py-20">
+              <h2 className="font-primary text-2xl font-bold text-heading text-center mb-8">
+                Projects
+              </h2>
+              <p className="text-muted text-center">Projects section will be built in Task 9</p>
+            </section>
+
+            <section id="contact" className="py-20">
+              <h2 className="font-primary text-2xl font-bold text-heading text-center mb-8">
+                Contact
+              </h2>
+              <p className="text-muted text-center">Contact section will be built in Task 9</p>
+            </section>
+          </main>
+        </>
       )}
     </div>
   )

src/components/FloatingNav.tsx

@@ -0,0 +1,68 @@
+import { useCallback } from 'react'
+import { motion } from 'framer-motion'
+import { useActiveSection } from '@/hooks/useActiveSection'
+
+interface NavLink {
+  id: string
+  label: string
+}
+
+const navLinks: NavLink[] = [
+  { id: 'about', label: 'About' },
+  { id: 'skills', label: 'Skills' },
+  { id: 'experience', label: 'Experience' },
+  { id: 'education', label: 'Education' },
+  { id: 'projects', label: 'Projects' },
+  { id: 'contact', label: 'Contact' },
+]
+
+export function FloatingNav() {
+  const activeSection = useActiveSection()
+
+  const scrollToSection = useCallback((sectionId: string) => {
+    const element = document.getElementById(sectionId)
+    if (element) {
+      element.scrollIntoView({ behavior: 'smooth' })
+    }
+  }, [])
+
+  return (
+    <motion.nav
+      className="fixed top-4 left-1/2 -translate-x-1/2 z-[100] max-w-[600px] w-auto bg-white rounded-full py-2 px-6 shadow-md flex items-center gap-1 border border-border overflow-x-auto scrollbar-hide"
+      initial={{ opacity: 0, y: -20 }}
+      animate={{ opacity: 1, y: 0 }}
+      transition={{ duration: 0.5, ease: 'easeOut' }}
+    >
+      {navLinks.map((link) => {
+        const isActive = activeSection === link.id
+        
+        return (
+          <button
+            key={link.id}
+            onClick={() => scrollToSection(link.id)}
+            className={`
+              relative font-secondary text-[13px] font-medium py-1.5 px-3.5 rounded-full
+              transition-colors duration-300 ease-out whitespace-nowrap
+              ${isActive 
+                ? 'text-teal font-semibold' 
+                : 'text-muted hover:text-teal hover:bg-teal-light'
+              }
+            `}
+          >
+            {link.label}
+            {isActive && (
+              <motion.span
+                className="absolute bottom-0 left-1/2 -translate-x-1/2 w-1 h-1 rounded-full bg-teal"
+                layoutId="navIndicator"
+                initial={{ opacity: 0, scale: 0 }}
+                animate={{ opacity: 1, scale: 1 }}
+                exit={{ opacity: 0, scale: 0 }}
+                transition={{ duration: 0.2, ease: 'easeOut' }}
+              />
+            )}
+          </button>
+        )
+      })}
+    </motion.nav>
+  )
+}

src/hooks/useActiveSection.ts

@@ -0,0 +1,58 @@
+import { useEffect, useState, useRef, useCallback } from 'react'
+
+const SECTION_IDS = ['about', 'skills', 'experience', 'education', 'projects', 'contact'] as const
+
+type SectionId = typeof SECTION_IDS[number]
+
+export function useActiveSection(): SectionId {
+  const [activeSection, setActiveSection] = useState<SectionId>('about')
+  const observerRef = useRef<IntersectionObserver | null>(null)
+  const visibleSectionsRef = useRef<Map<string, number>>(new Map())
+
+  const handleIntersect = useCallback((entries: IntersectionObserverEntry[]) => {
+    entries.forEach((entry) => {
+      const sectionId = entry.target.id
+      if (SECTION_IDS.includes(sectionId as SectionId)) {
+        if (entry.isIntersecting) {
+          visibleSectionsRef.current.set(sectionId, entry.intersectionRatio)
+        } else {
+          visibleSectionsRef.current.delete(sectionId)
+        }
+      }
+    })
+
+    const visibleEntries = Array.from(visibleSectionsRef.current.entries())
+    if (visibleEntries.length > 0) {
+      visibleEntries.sort((a, b) => {
+        const indexA = SECTION_IDS.indexOf(a[0] as SectionId)
+        const indexB = SECTION_IDS.indexOf(b[0] as SectionId)
+        return indexA - indexB
+      })
+      
+      const topSection = visibleEntries[0][0] as SectionId
+      setActiveSection(topSection)
+    }
+  }, [])
+
+  useEffect(() => {
+    observerRef.current = new IntersectionObserver(handleIntersect, {
+      rootMargin: '-20% 0px -70% 0px',
+      threshold: [0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1],
+    })
+
+    SECTION_IDS.forEach((id) => {
+      const element = document.getElementById(id)
+      if (element && observerRef.current) {
+        observerRef.current.observe(element)
+      }
+    })
+
+    return () => {
+      if (observerRef.current) {
+        observerRef.current.disconnect()
+      }
+    }
+  }, [handleIntersect])
+
+  return activeSection
+}

src/index.css

@@ -65,3 +65,16 @@ body {
 .animate-seed-pulse {
   animation: seedPulse 0.6s ease-in-out infinite;
 }
+
+.scrollbar-hide {
+  -ms-overflow-style: none;
+  scrollbar-width: none;
+}
+
+.scrollbar-hide::-webkit-scrollbar {
+  display: none;
+}
+
+html {
+  scroll-behavior: smooth;
+}