feat(binary): add full binary simulator with unsigned and two’s complement modes

- Introduce new Binary Simulator page with adjustable bit width (4–16 bits)
- Support unsigned and two’s complement representations with live conversion
- Add left/right shift operations and custom binary/denary input
- Implement accessible bulb-and-switch UI with MD3-inspired styling
- Add seven-segment display font assets for realistic number output
- Establish shared base layout, styles, and tooling for future simulators

Signed-off-by: Alexander Lyall <alex@adcm.uk>
This commit is contained in:
2025-12-14 16:57:31 +00:00
parent 7a694bf400
commit 50829688e3
113 changed files with 6769 additions and 6663 deletions

1
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---
import astroLogo from '../assets/astro.svg';
import background from '../assets/background.svg';
---
<div id="container">
<img id="background" src={background.src} alt="" fetchpriority="high" />
<main>
<section id="hero">
<a href="https://astro.build"
><img src={astroLogo.src} width="115" height="48" alt="Astro Homepage" /></a
>
<h1>
To get started, open the <code><pre>src/pages</pre></code> directory in your project.
</h1>
<section id="links">
<a class="button" href="https://docs.astro.build">Read our docs</a>
<a href="https://astro.build/chat"
>Join our Discord <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 127.14 96.36"
><path
fill="currentColor"
d="M107.7 8.07A105.15 105.15 0 0 0 81.47 0a72.06 72.06 0 0 0-3.36 6.83 97.68 97.68 0 0 0-29.11 0A72.37 72.37 0 0 0 45.64 0a105.89 105.89 0 0 0-26.25 8.09C2.79 32.65-1.71 56.6.54 80.21a105.73 105.73 0 0 0 32.17 16.15 77.7 77.7 0 0 0 6.89-11.11 68.42 68.42 0 0 1-10.85-5.18c.91-.66 1.8-1.34 2.66-2a75.57 75.57 0 0 0 64.32 0c.87.71 1.76 1.39 2.66 2a68.68 68.68 0 0 1-10.87 5.19 77 77 0 0 0 6.89 11.1 105.25 105.25 0 0 0 32.19-16.14c2.64-27.38-4.51-51.11-18.9-72.15ZM42.45 65.69C36.18 65.69 31 60 31 53s5-12.74 11.43-12.74S54 46 53.89 53s-5.05 12.69-11.44 12.69Zm42.24 0C78.41 65.69 73.25 60 73.25 53s5-12.74 11.44-12.74S96.23 46 96.12 53s-5.04 12.69-11.43 12.69Z"
></path></svg
>
</a>
</section>
</section>
</main>
<a href="https://astro.build/blog/astro-5/" id="news" class="box">
<svg width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg"
><path
d="M24.667 12c1.333 1.414 2 3.192 2 5.334 0 4.62-4.934 5.7-7.334 12C18.444 28.567 18 27.456 18 26c0-4.642 6.667-7.053 6.667-14Zm-5.334-5.333c1.6 1.65 2.4 3.43 2.4 5.333 0 6.602-8.06 7.59-6.4 17.334C13.111 27.787 12 25.564 12 22.666c0-4.434 7.333-8 7.333-16Zm-6-5.333C15.111 3.555 16 5.556 16 7.333c0 8.333-11.333 10.962-5.333 22-3.488-.774-6-4-6-8 0-8.667 8.666-10 8.666-20Z"
fill="#111827"></path></svg
>
<h2>What's New in Astro 5.0?</h2>
<p>
From content layers to server islands, click to learn more about the new features and
improvements in Astro 5.0
</p>
</a>
</div>
<style>
#background {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: -1;
filter: blur(100px);
}
#container {
font-family: Inter, Roboto, 'Helvetica Neue', 'Arial Nova', 'Nimbus Sans', Arial, sans-serif;
height: 100%;
}
main {
height: 100%;
display: flex;
justify-content: center;
}
#hero {
display: flex;
align-items: start;
flex-direction: column;
justify-content: center;
padding: 16px;
}
h1 {
font-size: 22px;
margin-top: 0.25em;
}
#links {
display: flex;
gap: 16px;
}
#links a {
display: flex;
align-items: center;
padding: 10px 12px;
color: #111827;
text-decoration: none;
transition: color 0.2s;
}
#links a:hover {
color: rgb(78, 80, 86);
}
#links a svg {
height: 1em;
margin-left: 8px;
}
#links a.button {
color: white;
background: linear-gradient(83.21deg, #3245ff 0%, #bc52ee 100%);
box-shadow:
inset 0 0 0 1px rgba(255, 255, 255, 0.12),
inset 0 -2px 0 rgba(0, 0, 0, 0.24);
border-radius: 10px;
}
#links a.button:hover {
color: rgb(230, 230, 230);
box-shadow: none;
}
pre {
font-family:
ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, 'DejaVu Sans Mono',
monospace;
font-weight: normal;
background: linear-gradient(14deg, #d83333 0%, #f041ff 100%);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
margin: 0;
}
h2 {
margin: 0 0 1em;
font-weight: normal;
color: #111827;
font-size: 20px;
}
p {
color: #4b5563;
font-size: 16px;
line-height: 24px;
letter-spacing: -0.006em;
margin: 0;
}
code {
display: inline-block;
background:
linear-gradient(66.77deg, #f3cddd 0%, #f5cee7 100%) padding-box,
linear-gradient(155deg, #d83333 0%, #f041ff 18%, #f5cee7 45%) border-box;
border-radius: 8px;
border: 1px solid transparent;
padding: 6px 8px;
}
.box {
padding: 16px;
background: rgba(255, 255, 255, 1);
border-radius: 16px;
border: 1px solid white;
}
#news {
position: absolute;
bottom: 16px;
right: 16px;
max-width: 300px;
text-decoration: none;
transition: background 0.2s;
backdrop-filter: blur(50px);
}
#news:hover {
background: rgba(255, 255, 255, 0.55);
}
@media screen and (max-height: 368px) {
#news {
display: none;
}
}
@media screen and (max-width: 768px) {
#container {
display: flex;
flex-direction: column;
}
#hero {
display: block;
padding-top: 10%;
}
#links {
flex-wrap: wrap;
}
#links a.button {
padding: 14px 18px;
}
#news {
right: 16px;
left: 16px;
bottom: 2.5rem;
max-width: 100%;
}
h1 {
line-height: 1.5;
}
}
</style>

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---
const { mode = "unsigned", defaultBits = 8 } = Astro.props;
// For unsigned: min 1 bit, max 16 bits (tweak if you want)
const minBits = 4;
const maxBits = 16;
const initialBits = Math.min(Math.max(defaultBits, minBits), maxBits);
---
<section class="binary-sim" data-mode={mode} data-bits={initialBits}>
<div class="top">
<div class="left-brand">
<!-- Replace with your logo/img -->
<div class="brand-box" aria-hidden="true">Computing:Box</div>
</div>
<div class="display" aria-live="polite">
<div class="label">DENARY</div>
<div id="denaryNumber" class="value">0</div>
<div class="label">BINARY</div>
<div id="binaryNumber" class="value mono">00000000</div>
</div>
<div class="actions">
<button class="btn" type="button" data-action="custom-binary">Custom Binary</button>
<button class="btn" type="button" data-action="custom-denary">Custom Denary</button>
<button class="btn" type="button" data-action="shift-left">Left Shift</button>
<button class="btn" type="button" data-action="shift-right">Right Shift</button>
<div class="bits-control">
<div class="bits-title">Bits</div>
<div class="bits-buttons">
<button class="btn small" type="button" data-action="bits-minus" aria-label="Decrease bits"></button>
<span id="bitsCount" class="bits-count">{initialBits}</span>
<button class="btn small" type="button" data-action="bits-plus" aria-label="Increase bits">+</button>
</div>
</div>
</div>
</div>
<div id="bitsRow" class="bits-row" aria-label="Binary bit switches"></div>
</section>
<script is:inline>
(() => {
const root = document.currentScript.closest(".binary-sim");
const bitsRow = root.querySelector("#bitsRow");
const binaryEl = root.querySelector("#binaryNumber");
const denaryEl = root.querySelector("#denaryNumber");
const bitsCountEl = root.querySelector("#bitsCount");
let bitCount = parseInt(root.dataset.bits || "8", 10);
const minBits = 4;
const maxBits = 16;
// state: array of 0/1, MSB at index 0
let bits = new Array(bitCount).fill(0);
function placeValues(n) {
// unsigned place values: [2^(n-1), ..., 2^0]
return Array.from({ length: n }, (_, i) => 2 ** (n - 1 - i));
}
function bitsToDenary(bitsArr) {
const pv = placeValues(bitsArr.length);
return bitsArr.reduce((acc, b, i) => acc + (b ? pv[i] : 0), 0);
}
function render() {
const binaryStr = bits.join("");
binaryEl.textContent = binaryStr;
denaryEl.textContent = String(bitsToDenary(bits));
bitsCountEl.textContent = String(bitCount);
const pv = placeValues(bitCount);
bitsRow.innerHTML = pv.map((value, i) => {
const id = `bit_${bitCount}_${i}`;
const checked = bits[i] === 1 ? "checked" : "";
return `
<div class="bit-col">
<div class="bulb ${bits[i] ? "on" : "off"}" aria-hidden="true"></div>
<div class="place">${value}</div>
<label class="switch" for="${id}">
<input id="${id}" type="checkbox" ${checked} data-index="${i}">
<span class="slider" aria-hidden="true"></span>
<span class="sr-only">Toggle bit value ${value}</span>
</label>
</div>
`;
}).join("");
}
function setBitsFromBinaryString(str) {
// allow shorter input; pad left
const clean = (str || "").trim();
if (!/^[01]+$/.test(clean) || clean.length > bitCount) return false;
const padded = clean.padStart(bitCount, "0");
bits = padded.split("").map(c => c === "1" ? 1 : 0);
return true;
}
function setBitsFromDenary(num) {
if (!Number.isInteger(num)) return false;
const max = (2 ** bitCount) - 1;
if (num < 0 || num > max) return false;
const bin = num.toString(2).padStart(bitCount, "0");
bits = bin.split("").map(c => c === "1" ? 1 : 0);
return true;
}
function shiftLeft() {
bits = bits.slice(1).concat(0);
}
function shiftRight() {
bits = [0].concat(bits.slice(0, -1));
}
function resizeBits(newCount) {
const clamped = Math.max(minBits, Math.min(maxBits, newCount));
if (clamped === bitCount) return;
// keep value as best as possible: preserve LSBs when resizing
const currentBinary = bits.join("");
bitCount = clamped;
bits = new Array(bitCount).fill(0);
const take = currentBinary.slice(-bitCount);
setBitsFromBinaryString(take);
}
// Switch input handler
bitsRow.addEventListener("change", (e) => {
const input = e.target;
if (!(input instanceof HTMLInputElement)) return;
const idx = parseInt(input.dataset.index || "-1", 10);
if (idx < 0) return;
bits[idx] = input.checked ? 1 : 0;
render();
});
// Button actions
root.querySelector(".actions").addEventListener("click", (e) => {
const btn = e.target.closest("button[data-action]");
if (!btn) return;
const action = btn.dataset.action;
if (action === "custom-binary") {
const entered = prompt(`Enter a ${bitCount}-bit binary value (0s and 1s):`, bits.join(""));
if (entered === null) return;
if (!setBitsFromBinaryString(entered)) {
alert(`Invalid binary. Use only 0 and 1, up to ${bitCount} digits.`);
return;
}
render();
}
if (action === "custom-denary") {
const max = (2 ** bitCount) - 1;
const entered = prompt(`Enter a denary value (0 to ${max}):`, String(bitsToDenary(bits)));
if (entered === null) return;
const num = Number.parseInt(entered, 10);
if (!setBitsFromDenary(num)) {
alert(`Invalid denary. Enter a whole number from 0 to ${max}.`);
return;
}
render();
}
if (action === "shift-left") { shiftLeft(); render(); }
if (action === "shift-right") { shiftRight(); render(); }
if (action === "bits-minus") { resizeBits(bitCount - 1); render(); }
if (action === "bits-plus") { resizeBits(bitCount + 1); render(); }
});
// initial
render();
})();
</script>
<style>
/* Layout */
.binary-sim {
padding: 2rem 1rem 3rem;
}
.top {
display: grid;
grid-template-columns: 260px 1fr 220px;
gap: 1.5rem;
align-items: start;
}
@media (max-width: 980px) {
.top {
grid-template-columns: 1fr;
}
.actions {
display: grid;
grid-template-columns: 1fr 1fr;
}
}
/* Brand placeholder */
.brand-box {
width: 180px;
height: 180px;
border-radius: 12px;
display: grid;
place-items: center;
font-weight: 700;
opacity: 0.9;
border: 1px solid rgba(255,255,255,0.08);
background: rgba(255,255,255,0.04);
}
/* Display */
.display {
text-align: center;
padding: 1rem;
}
.label {
letter-spacing: 0.12em;
opacity: 0.85;
margin-top: 0.5rem;
}
.value {
font-size: 3rem;
line-height: 1.1;
margin: 0.25rem 0 0.75rem;
font-weight: 700;
}
.mono {
font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}
/* Buttons */
.actions {
display: flex;
flex-direction: column;
gap: 0.75rem;
}
.btn {
border: 0;
border-radius: 10px;
padding: 0.75rem 1rem;
font-weight: 600;
cursor: pointer;
background: rgba(255,255,255,0.08);
color: inherit;
}
.btn:hover { background: rgba(255,255,255,0.12); }
.btn.small {
padding: 0.45rem 0.75rem;
border-radius: 10px;
}
.bits-control {
margin-top: 0.25rem;
padding-top: 0.5rem;
border-top: 1px solid rgba(255,255,255,0.08);
}
.bits-title { opacity: 0.8; margin-bottom: 0.35rem; }
.bits-buttons {
display: flex;
align-items: center;
gap: 0.5rem;
}
.bits-count {
min-width: 2ch;
text-align: center;
font-weight: 700;
}
/* Bits row */
.bits-row {
margin-top: 2rem;
display: grid;
grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
gap: 1.25rem;
align-items: end;
}
.bit-col {
text-align: center;
padding: 0.5rem 0.25rem;
}
.place {
margin: 0.5rem 0 0.5rem;
font-size: 2rem;
font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}
/* Bulb */
.bulb {
width: 26px;
height: 26px;
margin: 0 auto 0.25rem;
border-radius: 50%;
border: 1px solid rgba(255,255,255,0.15);
}
.bulb.off { opacity: 0.15; }
.bulb.on { opacity: 1; }
/* Light switch (accessible checkbox) */
.switch {
display: inline-flex;
align-items: center;
justify-content: center;
width: 64px;
height: 36px;
position: relative;
}
.switch input {
position: absolute;
opacity: 0;
width: 1px;
height: 1px;
}
.slider {
width: 64px;
height: 36px;
border-radius: 999px;
background: rgba(255,255,255,0.10);
border: 1px solid rgba(255,255,255,0.14);
position: relative;
transition: transform 120ms ease, background 120ms ease;
}
.slider::after {
content: "";
position: absolute;
top: 4px;
left: 4px;
width: 28px;
height: 28px;
border-radius: 999px;
background: rgba(255,255,255,0.85);
transition: transform 120ms ease;
}
.switch input:checked + .slider {
background: rgba(255,255,255,0.18);
}
.switch input:checked + .slider::after {
transform: translateX(28px);
}
/* focus */
.switch input:focus-visible + .slider {
outline: 3px solid rgba(255,255,255,0.35);
outline-offset: 2px;
}
.sr-only {
position: absolute;
width: 1px; height: 1px;
padding: 0; margin: -1px;
overflow: hidden; clip: rect(0,0,0,0);
white-space: nowrap; border: 0;
}
</style>

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---
// src/layouts/BaseLayout.astro
const { title = "Computing:Box" } = Astro.props;
---
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>{title}</title>
<link rel="stylesheet" href="/styles.css" />
<link rel="stylesheet" href="/fonts/DSEG7Classic-Regular.css">
</head>
<body>
<slot />
</body>
</html>

22
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width" />
<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
<meta name="generator" content={Astro.generator} />
<title>Astro Basics</title>
</head>
<body>
<slot />
</body>
</html>
<style>
html,
body {
margin: 0;
width: 100%;
height: 100%;
}
</style>

293
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---
let initialBits = 8;
---
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>Binary | Computing:Box</title>
<style>
:root{
--bg:#1f2027;
--text:#e8e8ee;
--muted:#a9acb8;
--accent:#33ff7a;
--accent-dim:rgba(51,255,122,.2);
--line:rgba(255,255,255,.12);
}
@font-face{
font-family:"DSEG7";
src:url("/fonts/DSEG7Classic-Regular.woff") format("woff"),
url("/fonts/DSEG7Classic-Regular.ttf") format("truetype");
}
body{
margin:0;
background:var(--bg);
color:var(--text);
font-family:system-ui,Segoe UI,Roboto,Arial;
}
.wrap{
max-width:1200px;
margin:auto;
padding:32px 20px 60px;
text-align:center;
}
.label{
letter-spacing:.18em;
color:var(--muted);
font-weight:700;
}
.num{
font-family:"DSEG7",monospace;
color:var(--accent);
text-shadow:0 0 18px var(--accent-dim);
}
.den{
font-size:64px;
}
.bin{
font-size:44px;
letter-spacing:.12em;
margin-bottom:12px;
}
.controls{
display:flex;
gap:10px;
justify-content:center;
flex-wrap:wrap;
margin:16px 0;
}
.btn{
background:rgba(255,255,255,.08);
border:1px solid rgba(255,255,255,.15);
color:#fff;
padding:10px 14px;
border-radius:12px;
cursor:pointer;
font-weight:700;
}
.panel{
margin-top:20px;
display:flex;
gap:24px;
justify-content:center;
flex-wrap:wrap;
}
.card{
background:rgba(255,255,255,.04);
border:1px solid var(--line);
border-radius:14px;
padding:14px 16px;
min-width:220px;
text-align:left;
}
.card h4{
margin:0 0 8px;
font-size:13px;
letter-spacing:.14em;
color:var(--muted);
}
.bits{
margin-top:28px;
padding-top:24px;
border-top:1px solid var(--line);
display:flex;
justify-content:center;
gap:20px;
flex-wrap:wrap;
}
.bit{
display:flex;
flex-direction:column;
align-items:center;
gap:8px;
}
/* bulb */
.bulb{
width:22px;
height:22px;
border-radius:50%;
background:rgba(255,255,255,.08);
border:1px solid rgba(255,255,255,.12);
}
.bulb.on{
background:#ffd86b;
box-shadow:0 0 18px rgba(255,216,107,.7);
}
/* SAME SWITCH USED EVERYWHERE */
.switch{
position:relative;
width:56px;
height:32px;
}
.switch input{opacity:0;width:0;height:0;}
.slider{
position:absolute;
inset:0;
background:rgba(255,255,255,.15);
border-radius:999px;
transition:.2s;
}
.slider::before{
content:"";
position:absolute;
width:26px;
height:26px;
left:3px;
top:3px;
background:white;
border-radius:50%;
transition:.2s;
}
.switch input:checked + .slider{
background:rgba(51,255,122,.4);
}
.switch input:checked + .slider::before{
transform:translateX(24px);
background:var(--accent);
}
</style>
</head>
<body>
<main class="wrap">
<div class="label">DENARY</div>
<div id="denary" class="num den">0</div>
<div class="label">BINARY</div>
<div id="binary" class="num bin">00000000</div>
<div class="controls">
<button class="btn" id="customBinary">Custom Binary</button>
<button class="btn" id="customDenary">Custom Denary</button>
<button class="btn" id="shiftL">Left Shift</button>
<button class="btn" id="shiftR">Right Shift</button>
</div>
<div class="panel">
<div class="card">
<h4>MODE</h4>
Unsigned
<label class="switch">
<input type="checkbox" id="mode">
<span class="slider"></span>
</label>
Twos complement
</div>
<div class="card">
<h4>BIT WIDTH</h4>
<input id="bitCount" type="number" min="4" max="64" value="8"
style="width:100%;padding:6px;border-radius:8px;border:none;">
</div>
</div>
<section class="bits" id="bits"></section>
</main>
<script type="module">
let bits = 8;
let twos = false;
let state = [];
const bitsEl = document.getElementById("bits");
function build(){
state = Array(bits).fill(false);
bitsEl.innerHTML = "";
for(let i=bits-1;i>=0;i--){
const val = 2**i;
const div = document.createElement("div");
div.className="bit";
div.innerHTML=`
<div class="bulb" id="b${i}"></div>
<div class="num">${val}</div>
<label class="switch">
<input type="checkbox" data-i="${i}">
<span class="slider"></span>
</label>`;
bitsEl.appendChild(div);
}
document.querySelectorAll('[data-i]').forEach(sw=>{
sw.onchange=()=>{state[sw.dataset.i]=sw.checked;update();}
});
update();
}
function update(){
let n=0;
state.forEach((on,i)=>{
if(on) n+=2**i;
document.getElementById(`b${i}`).classList.toggle("on",on);
});
if(twos && state[bits-1]) n-=2**bits;
document.getElementById("denary").textContent=n;
document.getElementById("binary").textContent=
state.slice().reverse().map(b=>b?1:0).join("");
}
document.getElementById("mode").onchange=e=>{
twos=e.target.checked;
update();
};
document.getElementById("bitCount").onchange=e=>{
const v=Math.max(4,Math.min(64,Number(e.target.value)));
bits=v;
build();
};
document.getElementById("shiftL").onclick=()=>{
state.shift();state.push(false);update();
};
document.getElementById("shiftR").onclick=()=>{
state.pop();state.unshift(false);update();
};
document.getElementById("customBinary").onclick=()=>{
const v=prompt(`Enter ${bits}-bit binary`);
if(!v||!/^[01]+$/.test(v))return;
const p=v.padStart(bits,"0").slice(-bits);
state=p.split("").reverse().map(b=>b==="1");
build();
};
document.getElementById("customDenary").onclick=()=>{
const max=twos?(2**(bits-1)-1):(2**bits-1);
const min=twos?-(2**(bits-1)):0;
const n=Number(prompt(`Enter ${min} to ${max}`));
if(isNaN(n)||n<min||n>max)return;
let val=n<0?n+2**bits:n;
state=Array(bits).fill(false);
for(let i=0;i<bits;i++){
if(val>=2**i){state[i]=true;val-=2**i;}
}
build();
};
build();
</script>
</body>
</html>

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---
import Welcome from '../components/Welcome.astro';
import Layout from '../layouts/Layout.astro';
// Welcome to Astro! Wondering what to do next? Check out the Astro documentation at https://docs.astro.build
// Don't want to use any of this? Delete everything in this file, the `assets`, `components`, and `layouts` directories, and start fresh.
---
<Layout>
<Welcome />
</Layout>

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let bits = [128,64,32,16,8,4,2,1];
let state = Array(8).fill(0);
const denaryEl = document.getElementById("denaryNumber");
const binaryEl = document.getElementById("binaryNumber");
const bitEls = document.querySelectorAll(".bit");
bitEls.forEach((el, i) => {
el.addEventListener("click", () => {
state[i] = state[i] ? 0 : 1;
el.classList.toggle("on");
update();
});
});
function update() {
const denary = state.reduce((sum, bit, i) => sum + bit * bits[i], 0);
denaryEl.textContent = denary;
binaryEl.textContent = state.join("");
}
function requestBinary() {
const input = prompt("Enter 8-bit binary:");
if (!/^[01]{8}$/.test(input)) return;
state = input.split("").map(Number);
bitEls.forEach((el,i)=>el.classList.toggle("on",state[i]));
update();
}
function requestDenary() {
const input = parseInt(prompt("Enter denary (0255)"),10);
if (isNaN(input) || input < 0 || input > 255) return;
let value = input;
state = bits.map(b => {
if (value >= b) {
value -= b;
return 1;
}
return 0;
});
bitEls.forEach((el,i)=>el.classList.toggle("on",state[i]));
update();
}
function shiftBinary(dir) {
if (dir === "left") state.shift(), state.push(0);
if (dir === "right") state.pop(), state.unshift(0);
bitEls.forEach((el,i)=>el.classList.toggle("on",state[i]));
update();
}
update();

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/* src/styles/base.css */
@import "./md3-tokens.css";
html, body{ height:100%; }
body{
margin:0;
font-family: var(--font-sans);
background: var(--md-surface-2);
color: var(--md-on-surface);
}
a{ color: var(--md-primary); text-decoration: none; }
a:hover{ text-decoration: underline; }
.container{
max-width: 1100px;
margin: 0 auto;
padding: 16px;
}
.card{
background: var(--md-surface);
border: 1px solid var(--md-outline);
border-radius: var(--radius-2);
box-shadow: var(--shadow-1);
padding: 16px;
}
.btn{
display:inline-flex;
gap:8px;
align-items:center;
justify-content:center;
border-radius: 999px;
border: 1px solid var(--md-outline);
background: var(--md-surface);
color: var(--md-on-surface);
padding: 10px 14px;
font-weight: 600;
cursor: pointer;
}
.btn:hover{ filter: brightness(0.98); }
.btn:focus{ outline:none; box-shadow: var(--md-focus); }
.btn-primary{
background: var(--md-primary);
color: var(--md-on-primary);
border-color: transparent;
}
.badge{
display:inline-block;
padding: 2px 10px;
border-radius: 999px;
font-size: 12px;
border: 1px solid var(--md-outline);
background: var(--md-surface-2);
}
code, pre{ font-family: var(--font-mono); }

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.binary-container {
max-width: 1100px;
margin: auto;
padding: 2rem;
color: #e0e0e0;
}
.display {
text-align: center;
}
.label {
font-size: 1.2rem;
opacity: 0.7;
}
.number {
font-size: 3rem;
margin-bottom: 1rem;
color: #00ff66;
}
.controls {
margin-top: 1rem;
}
.controls button {
margin: 0.25rem;
padding: 0.6rem 1rem;
font-size: 1rem;
}
.bits {
display: grid;
grid-template-columns: repeat(8, 1fr);
gap: 1rem;
margin-top: 3rem;
}
.bit {
width: 40px;
height: 80px;
background: #333;
border-radius: 20px;
position: relative;
cursor: pointer;
}
.bit::after {
content: "";
width: 32px;
height: 32px;
background: #555;
border-radius: 50%;
position: absolute;
bottom: 6px;
left: 4px;
transition: all 0.2s ease;
}
.bit.on {
background: #00c853;
}
.bit.on::after {
bottom: 42px;
background: #eaffea;
}

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@font-face {
font-family: "DSEG7";
src: url("/fonts/DSEG7Classic-Regular.ttf") format("truetype");
font-weight: normal;
font-style: normal;
}
.dseg {
font-family: "DSEG7", monospace;
letter-spacing: 0.15em;
}

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/* src/styles/md3-tokens.css */
/* MD3-inspired tokens tuned for education: high readability, clear contrast, calm surfaces */
:root{
/* Typography */
--font-sans: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
--font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
/* Spacing + shape */
--radius-1: 10px;
--radius-2: 16px;
--radius-3: 22px;
--shadow-1: 0 1px 2px rgba(0,0,0,.08), 0 2px 8px rgba(0,0,0,.06);
/* Color roles (keep simple) */
--md-surface: #ffffff;
--md-surface-2: #f6f7fb;
--md-on-surface: #111318;
--md-primary: #2f6fed; /* calm blue */
--md-on-primary: #ffffff;
--md-secondary: #5a5f72; /* muted */
--md-on-secondary: #ffffff;
--md-tertiary: #0f766e; /* teal for "practical" tools */
--md-on-tertiary: #ffffff;
--md-outline: #d7dbe7;
--md-success: #1a7f37;
--md-warning: #b54708;
--md-danger: #b42318;
/* Focus ring for accessibility */
--md-focus: 0 0 0 3px rgba(47,111,237,.28);
}
@media (prefers-color-scheme: dark){
:root{
--md-surface: #0b0e14;
--md-surface-2: #121725;
--md-on-surface: #e8eaf2;
--md-primary: #9bb6ff;
--md-on-primary: #0b0e14;
--md-secondary: #b8bccd;
--md-on-secondary: #0b0e14;
--md-tertiary: #4fd1c5;
--md-on-tertiary: #0b0e14;
--md-outline: #2b3244;
--md-focus: 0 0 0 3px rgba(155,182,255,.25);
}
}