Added some navigation

site/index.html

@@ -320,6 +320,65 @@
     <!-- Skip to main content link for keyboard users -->
     <a href="#main" class="skip-link">Skip to main content</a>
 
+    <!-- Nav Section -->
+    <nav id="nav" class="nav" aria-label="Main navigation">
+      <input
+        type="checkbox"
+        id="nav-toggle"
+        class="nav-toggle-input"
+        aria-hidden="true"
+        hidden
+      />
+      <div class="mobile-nav-header">
+        <span class="mobile nav-header-logo">
+          <img
+            src="/assets/wordmark.svg"
+            alt="mifi Ventures"
+            width="250"
+            height="33"
+          />
+        </span>
+        <label
+          for="nav-toggle"
+          class="nav-toggle"
+          aria-label="Toggle navigation"
+        >
+          <span class="nav-toggle-inner">
+            <span class="nav-toggle-line"></span>
+            <span class="nav-toggle-line"></span>
+            <span class="nav-toggle-line"></span>
+          </span>
+        </label>
+      </div>
+      <div class="nav-menu container">
+        <span class="nav-header-logo desktop">
+          <img
+            src="/assets/wordmark.svg"
+            alt="mifi Ventures"
+            width="250"
+            height="33"
+          />
+        </span>
+        <ul class="nav-list">
+          <li class="nav-item">
+            <a href="#what-we-do" class="nav-link">Services</a>
+          </li>
+          <li class="nav-item">
+            <a href="#impact" class="nav-link">Impact</a>
+          </li>
+          <li class="nav-item">
+            <a href="#how-we-work" class="nav-link">Process</a>
+          </li>
+          <li class="nav-item">
+            <a href="#schedule" class="nav-link">Contact</a>
+          </li>
+        </ul>
+        <div class="nav-item nav-back-to-top">
+          <a href="#header" class="nav-link">Back to top</a>
+        </div>
+      </div>
+    </nav>
+
     <!-- Header + Hero Section -->
     <header id="header" class="hero">
       <div class="container">

site/script.js

@@ -5,7 +5,7 @@
 
 (function() {
   'use strict';
-  
+
   // Update copyright year to current year
   // Script runs with defer, so DOM is always ready
   const yearElement = document.getElementById('copyright-year');

site/styles.css

@@ -352,6 +352,285 @@ a:focus-visible {
   background-color: var(--color-bg-alt);
 }
 
+/* ========================================
+   Nav Section
+   ======================================== */
+
+.nav {
+  background-color: var(--color-bg);
+  padding: var(--space-md) 0;
+  position: sticky;
+  text-align: center;
+  top: 0;
+  background-color: var(--color-bg);
+  border-bottom: 1px solid var(--color-border);
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
+  z-index: 100;
+}
+
+.nav .container,
+.nav .nav-menu {
+  display: grid;
+  grid-template-columns: 1fr auto 1fr;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.mobile-nav-header {
+  display: none;
+  justify-content: space-between;
+  align-items: center;
+}
+
+/* Logo recolored to text color via mask (works for <img> SVG in light/dark mode) */
+.nav-header-logo {
+  display: inline-block;
+  max-width: 250px;
+  background-color: var(--color-text);
+  -webkit-mask: url("/assets/wordmark.svg") center / contain no-repeat;
+  mask: url("/assets/wordmark.svg") center / contain no-repeat;
+  padding-left: var(--space-md);
+}
+
+.nav-header-logo img {
+  display: block;
+  max-width: 100%;
+  width: 100%;
+  height: auto;
+  opacity: 0;
+  pointer-events: none;
+}
+
+/* Hamburger toggle: mobile only, animates to X when open */
+.nav-toggle-input {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+.nav-toggle {
+  display: none;
+  align-items: center;
+  justify-content: flex-end;
+  flex: 0 0 auto;
+  padding: var(--space-sm) var(--space-md);
+  width: calc(24px + var(--space-md) + var(--space-md));
+  height: calc(31px + var(--space-sm) + var(--space-sm));
+  cursor: pointer;
+  color: var(--color-text);
+  background: transparent;
+  border: none;
+  border-radius: var(--space-xs);
+  transition: color 0.2s ease, background-color 0.2s ease;
+}
+
+.nav-toggle:hover {
+  color: var(--color-primary);
+}
+
+.nav-toggle:focus-visible {
+  outline: 4px solid var(--color-focus);
+  outline-offset: 4px;
+}
+
+.nav-toggle-inner {
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  width: 24px;
+  height: 18px;
+}
+
+.nav-toggle-line {
+  display: block;
+  width: 100%;
+  height: 2px;
+  background-color: currentColor;
+  border-radius: 1px;
+  transform-origin: center;
+  transition: transform 0.25s ease, opacity 0.2s ease;
+}
+
+/* Hamburger → X when checked */
+.nav-toggle-input:checked
+  ~ .mobile-nav-header
+  .nav-toggle
+  .nav-toggle-line:nth-child(1) {
+  transform: translateY(8px) rotate(45deg);
+}
+
+.nav-toggle-input:checked
+  ~ .mobile-nav-header
+  .nav-toggle
+  .nav-toggle-line:nth-child(2) {
+  opacity: 0;
+}
+
+.nav-toggle-input:checked
+  ~ .mobile-nav-header
+  .nav-toggle
+  .nav-toggle-line:nth-child(3) {
+  transform: translateY(-8px) rotate(-45deg);
+}
+
+/* Mobile: show toggle, collapse menu until opened; menu overlays content via anchor */
+@media (max-width: 768px) {
+  .nav {
+    display: flex;
+    flex-direction: column;
+    align-items: stretch;
+  }
+
+  .nav-toggle {
+    display: flex;
+  }
+
+  .mobile-nav-header {
+    display: flex;
+    anchor-name: --mobile-nav-header;
+  }
+
+  .nav-header-logo.desktop {
+    display: none;
+  }
+
+  .nav .nav-menu {
+    display: flex;
+    flex-direction: column;
+    align-items: stretch;
+    max-height: 0;
+    overflow: hidden;
+    opacity: 0;
+    padding-top: 0;
+    padding-bottom: 0;
+    border-top: none;
+    transition: max-height 0.3s ease, opacity 0.25s ease, padding 0.25s ease;
+  }
+
+  .nav-toggle-input:checked ~ .nav-menu {
+    max-height: 80vh;
+    opacity: 1;
+    padding-top: var(--space-md);
+    padding-bottom: var(--space-md);
+    border-top: 1px solid var(--color-border);
+  }
+
+  /* Overlay: position menu below header so it flows over content (no layout shift) */
+  @supports (top: anchor(bottom)) {
+    .nav .nav-menu {
+      position: fixed;
+      position-anchor: --mobile-nav-header;
+      top: anchor(--mobile-nav-header bottom);
+      left: anchor(--mobile-nav-header left);
+      right: anchor(--mobile-nav-header right);
+      margin: 0;
+      overflow-y: auto;
+      background-color: var(--color-bg);
+      border-bottom: 1px solid var(--color-border);
+      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+      z-index: 99;
+    }
+  }
+
+  .nav-menu .nav-list {
+    flex-direction: column;
+    gap: 0;
+  }
+
+  .nav-menu .nav-item {
+    margin: 0;
+    text-align: center;
+  }
+
+  .nav-menu .nav-item a,
+  .nav-menu .nav-back-to-top a {
+    display: block;
+    padding: var(--space-md);
+  }
+
+  .nav-menu .nav-item a:hover {
+    border-bottom-color: transparent;
+  }
+
+  .nav-list,
+  .nav-item {
+    width: 100%;
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    .nav-toggle-line {
+      transition-duration: 0.01ms;
+    }
+
+    .nav-menu {
+      transition-duration: 0.01ms;
+    }
+  }
+}
+
+.nav-list {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.nav-item {
+  margin: 0 var(--space-md);
+}
+
+/* Back to top + mobile nav logo: hidden until page is scrolled (CSS scroll-driven animation) */
+.nav-back-to-top,
+.nav-header-logo {
+  /* Fallback when scroll-driven animations aren’t supported: always visible */
+  opacity: 1;
+  visibility: visible;
+}
+
+@supports (animation-timeline: scroll()) {
+  .nav-back-to-top,
+  .nav-header-logo {
+    opacity: 0;
+    visibility: hidden;
+    pointer-events: none;
+    animation: nav-reveal-on-scroll linear;
+    animation-timeline: scroll(root block);
+    animation-range: 300px 400px;
+    animation-fill-mode: both;
+  }
+
+  @keyframes nav-reveal-on-scroll {
+    from {
+      opacity: 0;
+      visibility: hidden;
+      pointer-events: none;
+    }
+    to {
+      opacity: 1;
+      visibility: visible;
+      pointer-events: auto;
+    }
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    .nav-back-to-top,
+    .nav-header-logo {
+      animation: none;
+      opacity: 1;
+      visibility: visible;
+      pointer-events: auto;
+    }
+  }
+}
+
 /* ========================================
    Header / Hero Section
    ======================================== */
@@ -773,7 +1052,7 @@ a:focus-visible {
 }
 
 /* ========================================
-   Footer
+   Nav Items / Footer
    ======================================== */
 
 .footer {
@@ -798,6 +1077,7 @@ a:focus-visible {
   align-items: center;
 }
 
+.nav-item a,
 .footer-links a {
   font-size: var(--font-size-medium);
   font-weight: var(--font-weight-medium);
@@ -812,11 +1092,13 @@ a:focus-visible {
   align-items: center;
 }
 
+.nav-item a:hover,
 .footer-links a:hover {
   color: var(--color-primary);
   border-bottom-color: var(--color-primary);
 }
 
+.nav-item a:focus-visible,
 .footer-links a:focus-visible {
   outline: 4px solid var(--color-focus);
   outline-offset: 4px;