Stackline: developer-platform website reconstruction
Build a substantial four-page developer-SaaS study named Stackline. This replaces an older one-page concept with a complete product narrative and working local playground. Deliver index.html, playground.html, docs.html, and pricing.html with original branding, copy, geometric graphics, complete interactions, and local assets. Keep the existing stackline URL and catalog identity so existing library links continue to work.
Research and visual direction
Study the live reference at https://resend.com/, discovered through https://saaspo.com/pages/resend-landing-page. The observed reference uses a black technical canvas, a large two-line serif hero, a dimensional product sculpture, language-selectable code, explicit test-mode examples, large interface demonstrations, documentation, and pricing. Its desktop hero was inspected at 1280px wide: heading approximately96px with96px line height and400 weight, left alignment around88px from the edge, and a large three-dimensional object occupying the right side. Python language selection was exercised. Do not copy the reference logo, sculpture, illustrations, code, customer list, claims, or writing.
Translate the general developer-product hierarchy into an original deployment-preview concept. Stackline's object is four layered infrastructure plates, not the reference's cube. Its useful demo simulates a preview pipeline locally rather than sending email. Its code examples use a deliberately fictional .example endpoint. Its palette includes quiet mint signals on deep charcoal. The goal is to recreate the reference's level of depth and structure while giving this product an independent identity and behavior.
Avoid the earlier failure mode of a generic photograph plus short text and a token calculator. The homepage needs a substantial interactive hero graphic, a large code window, meaningful product demonstrations, environment context, practical questions, and a deliberate closing section. Every main action must lead to a real complete page or change an actual interface state. Do not add fake sign-in, customer logos, testimonials, compliance badges, or made-up performance claims to fill space.
Shared design system
Use a dark canvas #080b0c, supporting panel #101617, raised surface #172022, rules #2b3738, main text #edf2ee, muted text #9eada9, and mint accent #b4e6d5. The entire site has one coherent dark identity. Do not add a theme toggle that has no corresponding theme. The accent identifies clear status and meaningful boundaries; it is not a decorative glow on every element.
Use locally hosted Geist Variable for navigation, body copy, forms, controls, tables, and product-interface text. Use locally hosted DM Serif Display for the major narrative headings. This is a deliberate all-serif display system, not a random italic word mixed into a sans-serif line. Include both font licenses. Use a system monospace stack for code and log output. Preload the display face, use font-display swap, and verify that the file is TrueType before declaring its source format.
Desktop horizontal rails are6.25% of viewport width, with an80px header. Major sections have approximately100px vertical padding. Header navigation is compact13px type with30px gaps. Primary actions have a minimum48px height,7px corners, clear light-on-dark or dark-on-light contrast, and a small directional arrow. Other surfaces use5–10px radii according to their role. Keep dividers thin and shadows restrained. Do not put essential low-contrast text below readable sizes.
At widths below800px, use5% horizontal rails,70px navigation,65px section spacing, and stacked major layouts. At500px, the navigation becomes a real Menu button and panel. It exposes aria-expanded, references the menu ID, closes with Escape, and restores focus. All pages include a visible-on-focus skip link, one h1, main content, labeled navigation, and a footer linking to documentation, pricing, credits, and ProtoSites.
Homepage opening and dimensional graphic
The hero is a two-column layout, slightly wider on the text side, with a minimum height near650px. Its headline is “Deployment, considered.” on two intentional lines, roughly62–106px depending on width, with1.03 line height and tight tracking. Explain the benefit in a short paragraph about a clear build, a useful check, and a preview ready for a conversation. The main action is Try the playground. The secondary action opens Documentation.
Construct the right-side visual in native CSS: a300px square stack under perspective, rotated roughly58degrees on the X axis and-35degrees around Z. Four square plates have dark layered surfaces, fine mint-grey edges, an inset grid, and a small illuminated indicator line. Their depth offset is30px per layer. An Inspect the layers button changes the spacing to65px per layer; a second press brings them together. Use aria-pressed and a label reflecting the next action. This is an actual user-controlled visual state, not an endless autoplay decoration.
The transformation transition lasts around650ms with a calm cubic-bezier curve. Reduced motion removes the transition while keeping both states usable. Do not add a continuous rotation that requires the visitor to chase the image. On tablets, reduce the sculpture to250px; on phones, use210px and an approximately330px visual region. Prevent the transformed artwork from causing document overflow. The sculpture is decorative and hidden from assistive technology; the control has an explicit name.
Keep a matching original code-drawn geometric hero.webp for the library thumbnail. Its purpose is a portable thumbnail, not a photograph or an additional product feature. Credits must distinguish CSS artwork and code-drawn raster illustration from licensed photography. Remove unused legacy Stackline images from the new downloadable folder so the package contains only relevant assets.
Language-selectable integration section
After the opening, add a thin capability rail containing four concise ideas: explicit requests, separate environments, visible checks, and complete examples. Use standard locally rendered Lucide icons with their license included. Then introduce the integration section with a large centered display heading and a narrow explanatory paragraph.
The code demonstration is a substantial window up to roughly1050px wide, with a toolbar, language buttons, copy action, code content, and explanatory aside. Provide JavaScript, Python, and cURL examples of the same conceptual preview request. The code must be original and must clearly say the .example endpoint is illustrative. Do not present a nonexistent SDK as an installable package. No code is executed when a visitor selects or copies a language.
Language buttons use aria-pressed and a visible selected state. Selecting one updates the textContent of the code block, preserving whitespace. The copy button copies the currently selected example, reports success only after the clipboard promise resolves, and gives a useful selection instruction if clipboard access is unavailable. Code remains selectable in all states. Do not use innerHTML to render untrusted input or unnecessarily implement a custom syntax highlighter.
The desktop code window has approximately1.65-to-one columns. Its right-side explanation uses a concise contract statement and a small example response. This aside is supporting product context, not a separate feature card. At800px and below, place it underneath the code. Long lines wrap safely with overflow-wrap support. Keep code around13px on desktop and11px on very small screens, with generous line height. The footer of the window states that the concept endpoint is not live and links to the actual documentation page.
Product demonstrations and environments
The next section explains confidence through visible details. Use two substantial side-by-side panels with a shared outer border. One shows the four preview stages, each with a clear status. The other shows an event trail from source ready to preview ready. These are illustrative snapshots; their links lead to the real simulator and state-model documentation. The full simulator, rather than decorative sample text, is where success, failure, and cancellation are exercised.
Avoid three equal generic feature cards. The two panels have different visual content but share spacing, type hierarchy, border weight, and icon treatment. On mobile they stack and the dividing border changes orientation. Their descriptions are short and concrete. A later environment section uses a split narrative and actual preview/staging rows. Each row has a link to playground.html with its environment query parameter, so the selected environment is reflected when the visitor arrives.
The final homepage questions explain what the playground does, whether the examples are a real SDK, how failure recovery works, and whether pricing is real. Use native details and summary. Close with a large display statement and a working playground action. Do not include an invented company address, status service, or real customer proof.
Complete local playground
The playground has a page introduction and a two-column application surface. The330px left side contains a form for project name, environment, and simulation outcome. Project names must start with a lowercase letter and contain3–32 lowercase letters, digits, or hyphens. Use a required input, a pattern, maxlength, and a useful validation title. The environment selector offers Preview and Staging. The outcome selector offers Success and Failed checks.
The right side contains a clear run status, four stage rows, a readable log, and a structured result area. The four stages are Read the source, Build the preview, Run the checks, and Prepare the handoff. Use the exact stage descriptions supplied below. Every stage begins Waiting, changes to Running, and reaches Complete unless the run fails or is cancelled. Text states accompany color and icons so status is never color-only.
Submitting captures the current inputs and creates one AbortController for the run. Disable the run action while active and enable Cancel run. Each local stage waits approximately350ms before completing, making the progression inspectable without a long fake loading sequence. This is a real simulation state machine; label it as such. No network request, repository access, file upload, deployment, or account operation occurs.
If Failed checks is selected, stop at the checks stage, mark it Failed, explain the illustrative missing-build-output problem in the log, and leave later stages Waiting. Do not produce a ready address after a failure. When Success is selected, complete all stages and show a JSON result with project, environment, status ready, a .example address, and localSimulation true. Display the address as sample text, not a misleading link to a supposedly deployed website.
Cancel run aborts the active local wait. The active stage becomes Cancelled, the log states that nothing was deployed, and no ready result is created. Remove abort listeners after a successful timer completion and clear timers on abort. Always restore controls in a finally block after success, failure, or cancellation. Prevent overlapping runs by checking whether a controller already exists. A new run clears old logs/results and resets every stage before starting.
Read the environment query parameter defensively. Only preview and staging are accepted; unknown values use the normal default. Keep selected project values on the page after a run so the visitor can change the outcome and explore recovery. On phones, stack the form above the output and let the whole document scroll. Do not create inaccessible nested scroll regions or place essential status beneath fixed overlays.
Documentation page
The documentation is a complete original explanation of the concept. Use a small sticky section index on desktop and a wrapping normal-flow index on phones. Cover Overview, Request shape, Run states, Failure and cancellation, and Usage assumptions. Every anchor points to a real heading. Include the full conceptual JavaScript request, a table describing the four stages, and concrete explanations of how failure and cancellation behave.
Be explicit that the .example host is reserved for illustration and that the snippet is not a working remote API. The documentation should connect the code shape to the local simulator without misleading users about backend availability. Explain that a cancellation cannot leave a remote deployment running because no remote deployment exists in this study. Include real links to the playground and pricing calculator. Avoid empty documentation tabs or boilerplate pages whose only content is a heading.
Transparent usage calculator
The pricing page demonstrates an original illustrative usage model. Provide two native range controls: monthly builds from0 to5000 in100-build steps, and monthly transfer from0 to200GB in5GB steps. Default to1000 builds and20GB. Show the current value beside each labeled control. Keep the controls keyboard-accessible through native range behavior.
The monthly base is $15. Include the first200 builds and10GB. Additional builds cost $0.015 each; additional transfer costs $0.10 perGB. Calculate each extra amount using max(0, usage minus included quantity), and round the final total to cents. At the default values, build overage is $12, transfer overage is $1, and total is $28. At or below the included usage, total stays $15. At5000 builds and200GB, total is $106.
Show the total prominently and present the three line items separately. Explain the assumptions directly below the calculator. State that values are illustrative USD before taxes and no subscription or payment is created. Do not add a checkout button. Keep the pricing page a useful complete explanation, with a link back to the playground for visitors who want to explore the concept.
Motion, assets, and delivery
Motion belongs to real interactions: the layered hero inspection, language changes, visible simulator stages, and a progressive code-window arrival. A CSS view timeline can move the code window upward35px as it enters. Unsupported browsers show the final layout normally. Respect prefers-reduced-motion in every animated surface. Keep text fully readable throughout and avoid opacity effects that temporarily reduce contrast below acceptable levels.
Deliver the four HTML pages, CSS/JavaScript source through the builder, exact sample records, local font files and licenses, Lucide license, original thumbnail art, asset credits, and this detailed reconstruction prompt. The individual download must work after extraction without a package installation or external image service. Native page links should resolve relative to the folder; the collection pack rewrites the ProtoSites return link to its offline gallery.
Verify the user journeys proportionally but completely: hero-layer toggle, all language examples and copy feedback, project-name validation, environment deep links, success/failure/cancel/retry, correct result context, no overlapping runs, usage calculations at default and boundary values, mobile navigation/Escape, documentation anchors, and all page links/assets. Check320px and390px widths as well as desktop. Run syntax, TypeScript, scoped lint, serializer/calculation tests where useful, archive integrity, and production build. Use local performance/accessibility audits to identify real failures. Report observed outcomes honestly and keep this existing-entry rebuild separate from the count of newly added sites.
Final browser refinements
Use the HTML pattern [a-z](?:[a-z0-9]|-){2,31} for the project field. Keeping the hyphen outside the character class avoids Unicode-set pattern parsing differences in current browsers. At narrow widths the display heading uses clamp(48px,15.5vw,62px), and hero grid children have min-width:0; verify actual glyph bounds, not only document scroll width. Range controls have explicit labels and separate output elements so the native sliders retain accessible names. Disable context inputs while a simulation runs, and restore them for every terminal outcome. Reduced motion removes the visual stage delays while retaining the complete state flow.
Exact request examples and stage records
{
"examples": {
"javascript": "// Concept request. This endpoint is illustrative.\nconst response = await fetch(\n 'https://api.stackline.example/previews',\n {\n method: 'POST',\n headers: { 'Content-Type': 'application/json' },\n body: JSON.stringify({\n project: 'fieldnotes',\n environment: 'preview',\n branch: 'feature/new-direction'\n })\n }\n);\n\nconst preview = await response.json();",
"python": "# Concept request. This endpoint is illustrative.\nimport json\nfrom urllib.request import Request, urlopen\n\npayload = json.dumps({\n 'project': 'fieldnotes',\n 'environment': 'preview',\n 'branch': 'feature/new-direction'\n}).encode()\n\nrequest = Request(\n 'https://api.stackline.example/previews',\n data=payload,\n headers={'Content-Type': 'application/json'}\n)\n# Do not execute: example endpoint only.",
"curl": "# Concept request. This endpoint is illustrative.\ncurl https://api.stackline.example/previews \\\n --request POST \\\n --header 'Content-Type: application/json' \\\n --data '{\n \"project\": \"fieldnotes\",\n \"environment\": \"preview\",\n \"branch\": \"feature/new-direction\"\n }'\n\n# Explore the local simulator to see a response."
},
"stages": [
{
"id": "source",
"name": "Read the source",
"detail": "Resolve the selected project and environment."
},
{
"id": "build",
"name": "Build the preview",
"detail": "Assemble the illustrative application bundle."
},
{
"id": "checks",
"name": "Run the checks",
"detail": "Evaluate the selected simulation outcome."
},
{
"id": "ready",
"name": "Prepare the handoff",
"detail": "Create an example address and response."
}
]
}
Reference interaction handler
const estimateUsage = function estimateUsage(builds, bandwidth) {
const base = 15;
const buildCost = Math.max(0, builds - 200) * 0.015;
const bandwidthCost = Math.max(0, bandwidth - 10) * 0.1;
return {
base,
buildCost,
bandwidthCost,
total: Math.round((base + buildCost + bandwidthCost) * 100) / 100,
};
};
const data = JSON.parse(document.getElementById('stackline-data').textContent);
const reduced = matchMedia('(prefers-reduced-motion: reduce)');
const layerButton = document.getElementById('inspect-layers');
layerButton?.addEventListener('click', () => {
const expanded = layerButton.getAttribute('aria-pressed') !== 'true';
layerButton.setAttribute('aria-pressed', String(expanded));
document.querySelector('.stack-art').classList.toggle('expanded', expanded);
layerButton.textContent = expanded
? 'Bring layers together'
: 'Inspect the layers';
});
const code = document.getElementById('code-example');
if (code) {
document.querySelectorAll('[data-language]').forEach((button) =>
button.addEventListener('click', () => {
code.textContent = data.examples[button.dataset.language];
document
.querySelectorAll('[data-language]')
.forEach((item) =>
item.setAttribute('aria-pressed', String(item === button)),
);
document.getElementById('code-status').textContent = '';
}),
);
document.getElementById('copy-code').addEventListener('click', async () => {
try {
await navigator.clipboard.writeText(code.textContent);
document.getElementById('code-status').textContent =
'Concept request copied.';
} catch {
document.getElementById('code-status').textContent =
'Select the code to copy it. Clipboard access is unavailable.';
}
});
}
const form = document.getElementById('simulation-form');
if (form) {
const initialEnvironment = new URLSearchParams(location.search).get(
'environment',
);
if (['preview', 'staging'].includes(initialEnvironment))
document.getElementById('environment').value = initialEnvironment;
let controller = null;
const run = document.getElementById('run-preview');
const cancel = document.getElementById('cancel-preview');
const log = document.getElementById('run-log');
const status = document.getElementById('run-status');
const markStage = (id, state) => {
const node = document.querySelector(`[data-stage="${id}"]`);
node.dataset.state = state;
node.querySelector('.stage-status').textContent = state;
};
function wait(signal) {
return new Promise((resolve) => {
if (signal.aborted) {
resolve(false);
return;
}
const timer = setTimeout(
() => {
signal.removeEventListener('abort', abort);
resolve(true);
},
reduced.matches ? 0 : 350,
);
function abort() {
clearTimeout(timer);
resolve(false);
}
signal.addEventListener('abort', abort, { once: true });
});
}
form.addEventListener('submit', async (event) => {
event.preventDefault();
if (controller || !form.reportValidity()) return;
const project = document.getElementById('project-name').value.trim();
const environment = document.getElementById('environment').value;
const outcome = document.getElementById('outcome').value;
controller = new AbortController();
const signal = controller.signal;
form
.querySelectorAll('input,select')
.forEach((control) => (control.disabled = true));
run.disabled = true;
cancel.disabled = false;
log.textContent = 'LOCAL SIMULATION\n';
document.getElementById('run-result').textContent = '';
status.textContent = 'Simulation running';
data.stages.forEach((stage) => markStage(stage.id, 'Waiting'));
try {
for (const stage of data.stages) {
markStage(stage.id, 'Running');
log.textContent += '> ' + stage.name + '\n';
if (!(await wait(signal))) {
markStage(stage.id, 'Cancelled');
status.textContent = 'Simulation cancelled';
log.textContent += 'Stopped locally. Nothing deployed.\n';
return;
}
if (stage.id === 'checks' && outcome === 'fail') {
markStage(stage.id, 'Failed');
status.textContent = 'Sample checks failed';
log.textContent +=
'Example validation error: missing build output.\nChoose Success and run again to explore recovery.\n';
return;
}
markStage(stage.id, 'Complete');
}
const result = {
project,
environment,
status: 'ready',
address: `https://${project}-${environment}.example/`,
localSimulation: true,
};
document.getElementById('run-result').textContent = JSON.stringify(
result,
null,
2,
);
status.textContent = 'Sample preview ready';
log.textContent +=
'All local stages complete. No remote deployment occurred.\n';
} finally {
controller = null;
form
.querySelectorAll('input,select')
.forEach((control) => (control.disabled = false));
run.disabled = false;
cancel.disabled = true;
}
});
cancel.addEventListener('click', () => controller?.abort());
}
const builds = document.getElementById('build-usage');
if (builds) {
const bandwidth = document.getElementById('bandwidth-usage');
const money = (value) => '$' + value.toFixed(2);
function update() {
const result = estimateUsage(Number(builds.value), Number(bandwidth.value));
document.getElementById('build-value').textContent =
builds.value + ' builds';
document.getElementById('bandwidth-value').textContent =
bandwidth.value + ' GB';
document.getElementById('estimate-base').textContent = money(result.base);
document.getElementById('estimate-builds').textContent = money(
result.buildCost,
);
document.getElementById('estimate-bandwidth').textContent = money(
result.bandwidthCost,
);
document.getElementById('estimate-total').textContent = money(result.total);
}
builds.addEventListener('input', update);
bandwidth.addEventListener('input', update);
update();
}
const menu = document.getElementById('menu-toggle');
menu.addEventListener('click', () => {
const open = menu.getAttribute('aria-expanded') !== 'true';
menu.setAttribute('aria-expanded', String(open));
document.getElementById('main-nav').classList.toggle('open', open);
menu.textContent = open ? 'Close' : 'Menu';
});
document.addEventListener('keydown', (event) => {
if (event.key === 'Escape' && menu.getAttribute('aria-expanded') === 'true') {
menu.click();
menu.focus();
}
});