Page structure

tier 2 — classes

The parts that hold a page together: the title row, section breaks, editorial asides, and a block of code or output.

Page head

Heading, an optional supporting line, and the actions that apply to the whole page. It wraps rather than shrinking the title, so on a narrow screen the actions drop below the heading instead of truncating it.

Approval queue

Items the AI proposed and is waiting on a human decision for.

<div class="page-head">
    <div class="page-head-text">
        <h1>Approval queue</h1>
        <p>Items the AI proposed and is waiting on a human decision for.</p>
    </div>
    <div class="page-head-actions">
        <button class="btn" type="button"><i class="ri-refresh-line"></i> Refresh</button>
        <button class="btn btn-primary" type="button"><i class="ri-check-double-line"></i> Approve all</button>
    </div>
</div>

Dividers

A rule between sections. Use it when two blocks are related but distinct, whitespace when they are merely sequential, and a card when one of them is an object in its own right.

Above the rule.

Below it.

Escalation

After a labelled break.

Callouts

An editorial aside inside prose — a note, a caveat, a worked example — permanent, and about the content. Its two neighbours are about something else: .alert is about the page right now and .card-warning about one card's own data, and an alert that never goes away trains people to ignore alerts.

Times are UTC Every timestamp in this console is UTC, including the SLA countdown. The clock in your header is local.

Approving a reservation writes to the warehouse immediately. There is no undo, only a follow-up correction.

Informational .callout-info — background reading that changes nothing the reader has to do.

.callout-danger — a permanent hazard in the content itself, not a failure of the page. Reserve it: a page of red callouts is a page nobody reads.

Tip Hold Shift while approving to skip the confirmation for the rest of the session.

<div>
    <div class="callout">
        <i class="ri-information-line"></i>
        <div class="callout-body">
            <span class="callout-title">Times are UTC</span>
            Every timestamp in this console is UTC, including the SLA countdown. The
            clock in your header is local.
        </div>
    </div>
    <div class="callout callout-warn">
        <i class="ri-alert-line"></i>
        <div class="callout-body">
            Approving a reservation writes to the warehouse immediately. There is no undo, only
            a follow-up correction.
        </div>
    </div>
    <div class="callout callout-info">
        <i class="ri-information-line"></i>
        <div class="callout-body">
            <span class="callout-title">Informational</span>
            <code>.callout-info</code> — background reading that changes nothing the reader
            has to do.
        </div>
    </div>
    <div class="callout callout-danger">
        <i class="ri-error-warning-line"></i>
        <div class="callout-body">
            <code>.callout-danger</code> — a permanent hazard in the content itself, not a
            failure of the page. Reserve it: a page of red callouts is a page nobody reads.
        </div>
    </div>
    <div class="callout callout-go">
        <i class="ri-lightbulb-line"></i>
        <div class="callout-body">
            <span class="callout-title">Tip</span>
            Hold <kbd>Shift</kbd> while approving to skip the confirmation for the rest of
            the session.
        </div>
    </div>
</div>

Code blocks

For a command, a payload, a stack trace — anything the reader wants verbatim, with a copy button that appears on hover and stays visible where there is no hover to speak of. No syntax highlighting, and there will not be any; the block scrolls sideways rather than wrapping, because a wrapped command no longer copies correctly by eye.

dotnet add package Sedna.UI
dotnet restore

order.json

{
  "number": "ORD-4209",
  "priority": 3,
  "assignment_group": "EU-Central",
  "reservation": { "action": "reroute", "confidence": 0.87 }
}

            <div style="display:flex; flex-direction:column; gap:16px">
                <div class="code-block">
                    <button class="code-block-copy" type="button" data-copy-target>
                        <i class="ri-file-copy-line"></i> Copy
                    </button>
                    <pre><code>dotnet add package Sedna.UI
dotnet restore</code></pre>
                </div>
                <div class="code-block">
                    <div class="code-block-head">
                        <span>order.json</span>
                        <button class="code-block-copy" type="button" data-copy-target>
                            <i class="ri-file-copy-line"></i> Copy
                        </button>
                    </div>
                    <pre><code>{
  "number": "ORD-4209",
  "priority": 3,
  "assignment_group": "EU-Central",
  "reservation": { "action": "reroute", "confidence": 0.87 }
}</code></pre>
                </div>
            </div>

Several files, in a card

Live — switch files. When one thing is two files — a page and the dialog it opens — put them in a card with tabs, one code block per panel. Add .code-block--flush to each block: the card already draws the frame, and the block's own border inside it is a second one.

<button class="btn" type="button" onclick="document.getElementById('reassign').showModal()">
    Reassign ORD-4209
</button>

<dialog class="drawer" id="reassign" aria-labelledby="reassign-title">
    <div class="drawer-header"><h3 id="reassign-title">Reassign ORD-4209</h3></div>
</dialog>

<div class="card">
    <div class="card-head card-head--tabs">
        <div class="tabs" role="tablist" data-tabs aria-label="Reassign an order — files">
            <button class="tab" role="tab" type="button" id="reassign-page" aria-controls="reassign-page-code" aria-selected="true">
                Page.razor
            </button>
            <button class="tab" role="tab" type="button" id="reassign-dialog" aria-controls="reassign-dialog-code" aria-selected="false" tabindex="-1">
                Dialog.razor
            </button>
        </div>
    </div>
    <div class="card-body card-body--flush">
        <div class="tab-panel" role="tabpanel" id="reassign-page-code" aria-labelledby="reassign-page">
            <div class="code-block code-block--flush">
                <button class="code-block-copy" type="button" data-copy-target>
                    <i class="ri-file-copy-line" data-copied-hide></i><span data-copied-hide>Copy</span>
                    <i class="ri-check-line" data-copied-show="ok"></i><span data-copied-show="ok">Copied</span>
                </button>
                <pre tabindex="0" role="group" aria-label="Page.razor"><code>&lt;button class="btn" type="button" onclick="document.getElementById('reassign').showModal()"&gt;
    Reassign ORD-4209
&lt;/button&gt;</code></pre>
            </div>
        </div>
        <div class="tab-panel" role="tabpanel" id="reassign-dialog-code" aria-labelledby="reassign-dialog" hidden>
            <div class="code-block code-block--flush">
                <button class="code-block-copy" type="button" data-copy-target>
                    <i class="ri-file-copy-line" data-copied-hide></i><span data-copied-hide>Copy</span>
                    <i class="ri-check-line" data-copied-show="ok"></i><span data-copied-show="ok">Copied</span>
                </button>
                <pre tabindex="0" role="group" aria-label="Dialog.razor"><code>&lt;dialog class="drawer" id="reassign" aria-labelledby="reassign-title"&gt;
    &lt;div class="drawer-header"&gt;&lt;h3 id="reassign-title"&gt;Reassign ORD-4209&lt;/h3&gt;&lt;/div&gt;
&lt;/dialog&gt;</code></pre>
            </div>
        </div>
    </div>
</div>

A long block, clamped

Live — expand it. .code-block--clamped bounds the block to --code-clamp (360px; 180px here) and scrolls inside it, and the .code-block-lip fades the last visible line so the reader can see there is more. The .code-block-expand button carries data-code-expand, and the script removes the clamp and flips aria-expanded. The label sits in a <span> so the icon survives the swap: data-code-collapse is the wording once open and data-code-expand-label the wording on the way back. Keep tabindex="0" on the <pre>: a scroll container a keyboard cannot reach is a part of the page a keyboard cannot read.

build-runner-04 · job 8841

Unhandled exception. System.InvalidOperationException: The reservation has already been decided.
   at Northwind.Dispatch.Reservations.Decide(ReservationId id, Decision decision) in /src/Dispatch/Reservations.cs:line 148
   at Northwind.Dispatch.Reservations.Reroute(ReservationId id, Region target) in /src/Dispatch/Reservations.cs:line 92
   at Northwind.Dispatch.Api.RerouteEndpoint.Handle(RerouteRequest request, CancellationToken ct) in /src/Dispatch.Api/RerouteEndpoint.cs:line 41
   at Microsoft.AspNetCore.Http.RequestDelegateFactory.ExecuteTaskResult[T](Task`1 task, HttpContext httpContext)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)
--- End of stack trace from previous location ---
   at Northwind.Dispatch.Api.Program.Main(String[] args) in /src/Dispatch.Api/Program.cs:line 22

Request: POST /api/reservations/rsv-20419/reroute
Correlation: 3f9c1a7e-6b2d-4c8e-9a51-0d7e4b2c1f60
Host: orders-console-01
Elapsed: 38 ms

<div class="code-block code-block--clamped" style="--code-clamp: 180px">
    <div class="code-block-head">
        <span>build-runner-04 · job 8841</span>
        <button class="code-block-copy" type="button" data-copy-target>
            <i class="ri-file-copy-line"></i> Copy
        </button>
    </div>
    <pre tabindex="0"><code>Unhandled exception. System.InvalidOperationException: The reservation has already been decided.
   at Northwind.Dispatch.Reservations.Decide(ReservationId id, Decision decision) in /src/Dispatch/Reservations.cs:line 148
   at Northwind.Dispatch.Reservations.Reroute(ReservationId id, Region target) in /src/Dispatch/Reservations.cs:line 92
   at Northwind.Dispatch.Api.RerouteEndpoint.Handle(RerouteRequest request, CancellationToken ct) in /src/Dispatch.Api/RerouteEndpoint.cs:line 41
   at Microsoft.AspNetCore.Http.RequestDelegateFactory.ExecuteTaskResult[T](Task`1 task, HttpContext httpContext)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)
--- End of stack trace from previous location ---
   at Northwind.Dispatch.Api.Program.Main(String[] args) in /src/Dispatch.Api/Program.cs:line 22

Request: POST /api/reservations/rsv-20419/reroute
Correlation: 3f9c1a7e-6b2d-4c8e-9a51-0d7e4b2c1f60
Host: orders-console-01
Elapsed: 38 ms</code></pre>
    <div class="code-block-lip">
        <button class="code-block-expand" type="button" data-code-expand aria-expanded="false"
                data-code-expand-label="Show all 16 lines" data-code-collapse="Show fewer lines">
            <i class="ri-arrow-down-s-line"></i> <span>Show all 16 lines</span>
        </button>
    </div>
</div>