Header: make mobile responsive

src/components/Header.astro

@@ -4,7 +4,7 @@ import { SITE_TITLE } from '../consts';
 ---
 
 <header style="width: 100%" class="font-sans sticky top-0 md:static bg-white underline-offset-4 z-40">
-    <nav>
+    <nav class="wide-screen">
         <div class="flex items-center space-x-8">
             <HeaderLink href="/"><img style="padding: 2px;" src="/favicon.avif" /></HeaderLink>
             <HeaderLink href="/blog">Blog</HeaderLink>
@@ -12,9 +12,7 @@ import { SITE_TITLE } from '../consts';
             <HeaderLink href="/llama">Llama</HeaderLink>
             <HeaderLink href="/meow">Meow</HeaderLink>
         </div>
-        <div class="fun-quote" style="margin: 0">
+        <div class="fun-quote text-2xl">ReLUwU activated</div>
-            <span style="font-family: var(--font-title);" class="text-2xl">ReLUwU activated</span>
-        </div>
         <div class="social-links flex space-x-8 items-center">
             <HeaderLink href="https://github.com/aizuko">GitHub</HeaderLink>
             <HeaderLink href="/contact">Contact</HeaderLink>
@@ -26,10 +24,31 @@ import { SITE_TITLE } from '../consts';
             </HeaderLink>
         </div>
     </nav>
+    <nav class="narrow-screen">
+        <div class="fun-quote">
+            <a href="/">ReLUwU activated</a>
+        </div>
+        <input id="menu-toggle" type="checkbox">
+        <label class="menu-button-container" for="menu-toggle">
+            <div class="menu-button"></div>
+        </label>
+        <ul class="menu">
+            <li><HeaderLink href="/">Home</HeaderLink></li>
+            <li><HeaderLink href="/blog">Blog</HeaderLink></li>
+            <li><HeaderLink href="/unix">Unix</HeaderLink></li>
+            <li><HeaderLink href="/llama">Llama</HeaderLink></li>
+            <li><HeaderLink href="/meow">Meow</HeaderLink></li>
+            <li><HeaderLink href="/contact">Contact</HeaderLink></li>
+            <li><HeaderLink href="/akemi_resume.pdf">Resume</HeaderLink></li>
+        </ul>
+    </nav>
 </header>
 
 <style>
-    header nav {
+    /*****************************************
+     * Full-width navigation bar.
+     ****************************************/
+    header nav.wide-screen {
         display: flex;
         flex-direction: row;
         justify-content: space-between;
@@ -39,18 +58,155 @@ import { SITE_TITLE } from '../consts';
         justify-items: center;
         align-items: center;
     }
-    header nav div {
+    header nav.wide-screen div {
         display: flex;
         flex: 1;
         justify-content: center;
     }
-    header nav div:first-child {
+    header nav.wide-screen div:first-child {
         justify-content: flex-start;
     }
-    header nav div:last-child {
+    header nav.wide-screen div:last-child {
         justify-content: flex-end;
     }
-    header nav img {
+    header nav.wide-screen img {
         height: 48px;
     }
+    header nav.wide-screen .fun-quote {
+        margin: 0;
+        font-family: var(--font-title);
+    }
+
+    /*****************************************
+     * Sandwich-style navigation bar.
+     ****************************************/
+    header nav.narrow-screen {
+        background-color: black;
+        color: white;
+        font-family: var(--font-sans);
+        font-weight: 600;
+        display: flex;
+        flex-direction: row;
+        justify-content: space-between;
+        padding: 14px 24px;
+        font-size: 1.125rem;
+        user-select: none;
+        justify-items: center;
+        align-items: center;
+    }
+    header nav.narrow-screen .fun-quote {
+        font-family: var(--font-title);
+        margin: 0;
+    }
+
+    /*****************************************
+     * Sandwich menu code adapted from:
+     * https://codepen.io/alvarotrigo/pen/MWEJEWG
+     ****************************************/
+    /* Toggle menu allows for clicking, but isn't diplayed */
+    header nav.narrow-screen #menu-toggle {
+        display: none;
+    }
+    header nav.narrow-screen #menu-toggle:checked
+    + .menu-button-container .menu-button::before {
+        margin-top: 0px;
+        transform: rotate(45deg);
+    }
+    header nav.narrow-screen #menu-toggle:checked
+    + .menu-button-container .menu-button {
+        background: rgba(255, 255, 255, 0);
+    }
+    header nav.narrow-screen #menu-toggle:checked
+    + .menu-button-container .menu-button::after {
+        margin-top: 0px;
+        transform: rotate(-45deg);
+    }
+    /* Actual sandwich menu visual - consists of 3 horizontal boxes */
+    header nav.narrow-screen .menu-button-container {
+        display: flex;
+        height: 100%;
+        width: 30px;
+        cursor: pointer;
+        flex-direction: column;
+        justify-content: center;
+        align-items: center;
+    }
+    header nav.narrow-screen .menu-button,
+    header nav.narrow-screen .menu-button::before,
+    header nav.narrow-screen .menu-button::after {
+        display: block;
+        background-color: #fff;
+        position: absolute;
+        height: 4px;
+        width: 30px;
+        transition: transform 400ms cubic-bezier(0.23, 1, 0.32, 1);
+        border-radius: 2px;
+    }
+    header nav.narrow-screen .menu-button::before {
+        content: '';
+        margin-top: -8px;
+    }
+    header nav.narrow-screen .menu-button::after {
+        content: '';
+        margin-top: 8px;
+    }
+    /* The dropdown menu after clicking the visual */
+    header nav.narrow-screen .menu {
+        position: absolute;
+        top: 0;
+        margin-top: 50px;
+        left: 0;
+        flex-direction: column;
+        width: 100%;
+        justify-content: center;
+        align-items: center;
+    }
+    header nav.narrow-screen #menu-toggle ~ .menu li {
+        height: 0;
+        margin: 0;
+        padding: 0;
+        border: 0;
+        transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1);
+    }
+    header nav.narrow-screen #menu-toggle:checked ~ .menu li {
+        border: 1px solid black;
+        height: 2.5em;
+        padding: 0.5em;
+        transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1);
+    }
+    header nav.narrow-screen .menu > li {
+        display: flex;
+        justify-content: center;
+        margin: 0;
+        padding: 0.5em 0;
+        width: 100%;
+        color: white;
+        background-color: black;
+    }
+    header nav.narrow-screen .menu > li:not(:last-child) {
+        border-bottom: 1px solid black;
+    }
+
+    /*****************************************
+     * >>>> Header breakpoints <<<<
+     * 1100px: remove center quote
+     * 760px: collapse into sandwich
+     *
+     * Note: {min,max}-width is inclusive
+     ****************************************/
+    @media (max-width: 1100px) {
+        header nav.wide-screen .fun-quote {
+            display: none;
+        }
+    }
+    @media (min-width: 761px) {
+        header nav.narrow-screen {
+            display: none;
+        }
+    }
+    @media (max-width: 760px) {
+        header nav.wide-screen {
+            display: none;
+        }
+    }
 </style>