Bevel

Activity log

A docket of what an agent did: thoughts, actions, questions, responses and errors, each timed. Questions waiting on you are highlighted.

Two agents on a matter

Entries arrive as the agents work. Who acted is a plain Name tag.

Harbor Street lease

Thought
Research
The notice clause is probably in section 9.
Action
Research
Opened lease.pdf, page 14.

Installation

Add with the CLI

  1. Once per project, add the Bevel registry to components.json.

    components.json
    {
  "registries": {
    "@bevel": "https://bevel-ui.vercel.app/r/{name}.json"
  }
}

  2. Add Activity log. This brings in the Bevel foundation, installs cn, and merges the styles into your global CSS.

    Terminal
    npx shadcn@latest add @bevel/activity-log
Install manually

  1. Install the dependencies.

    Terminal
    pnpm add cn

  2. Add the Bevel foundation, if you haven't already. Light, depth, materials, motion and shape tokens, plus the utilities components use to apply them.

    styles/bevel.css
    /*
 * Bevel foundation. Every component builds on these tokens and utilities;
 * component stylesheets only add their own palettes and shapes.
 *
 * Layers:
 *   1. Light     one source, above and slightly in front of the screen.
 *   2. Depth     named elevations built from the light: recessed, flush,
 *                raised, pressed, object.
 *   3. Material  a surface recipe (leather, plastic, metal) that reads
 *                --bevel-material and --bevel-material-edge.
 *   4. Motion    two curves, a spring, and durations named by purpose.
 *   5. Shape     radii, stitching, and the type scale for amounts.
 */

:root {
  /* 1. Light */
  --bevel-highlight: oklch(1 0 0 / 0.22);
  --bevel-highlight-strong: oklch(1 0 0 / 0.35);
  --bevel-shade: oklch(0 0 0 / 0.32);
  --bevel-shade-strong: oklch(0 0 0 / 0.5);
  --bevel-cast: oklch(0.25 0.03 50 / 0.22);
  /* Stamped into a surface: shaded on the upper inner edge, lit below. */
  --bevel-deboss: 0 -1px 0 oklch(0 0 0 / 0.45), 0 1px 0 oklch(1 0 0 / 0.12);

  /* 3. Material defaults; components and variants override these. */
  --bevel-material: oklch(0.47 0.085 52);
  --bevel-material-edge: oklch(0.3 0.06 44);
  --bevel-material-recess: oklch(0.2 0.008 260); /* neutral dark; materials set their own */
  --bevel-grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .7 0 0 0 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
  --bevel-grain-size: 180px;

  /* 2. Depth */
  --bevel-depth-recessed:
    inset 0 1px 2px var(--bevel-shade-strong),
    0 1px 0 var(--bevel-highlight);
  --bevel-depth-flush:
    inset 0 1px 0 var(--bevel-highlight),
    inset 0 -1px 0 var(--bevel-shade);
  --bevel-depth-raised:
    inset 0 1px 0 var(--bevel-highlight),
    0 1px 0 var(--bevel-material-edge),
    0 2px 0 var(--bevel-material-edge),
    0 3px 5px var(--bevel-shade);
  --bevel-depth-pressed:
    inset 0 1px 2px var(--bevel-shade),
    0 1px 0 var(--bevel-highlight);
  /* A whole object resting on the page. */
  --bevel-depth-object:
    inset 0 1px 0 var(--bevel-highlight),
    inset 0 -1px 0 var(--bevel-shade),
    0 0 0 1px var(--bevel-material-edge),
    0 1px 1px var(--bevel-cast),
    0 6px 12px -2px var(--bevel-cast),
    0 18px 32px -8px var(--bevel-cast);
  /* The shadow under a loose object, for filter: drop-shadow(). */
  --bevel-depth-cast-sm: 0 4px 6px var(--bevel-cast);
  /* A thin object (a card) lying on another surface. */
  --bevel-depth-sheet:
    inset 0 1px 0 var(--bevel-highlight-strong),
    inset 0 0 0 1px oklch(0 0 0 / 0.12),
    0 -1px 2px oklch(0 0 0 / 0.18);

  /* 4. Motion */
  --bevel-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --bevel-ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  /* Underdamped spring, ~8% overshoot. Pure CSS; pair with --bevel-duration-move or longer. */
  --bevel-ease-spring: linear(0, 0.06, 0.202, 0.38, 0.561, 0.723, 0.856, 0.955, 1.023, 1.062, 1.081, 1.083, 1.075, 1.062, 1.047, 1.032, 1.019, 1.009, 1.002, 0.997, 0.994, 0.993, 0.993, 0.994, 1);
  --bevel-duration-press: 100ms; /* a control giving under a finger */
  --bevel-duration-small: 200ms; /* hover lifts, tabs, small state changes */
  --bevel-duration-move: 300ms; /* objects moving: cards, drawers */
  --bevel-duration-ambient: 520ms; /* whole-scene changes: lighting */
  --bevel-stagger: 30ms;
  --bevel-lift: 3px; /* how far an object rises on hover */
  --bevel-perspective: 30rem; /* viewing distance for parts that turn in 3D (covers, flaps) */
  /* Unchosen items in a group sit back in shadow. */
  --bevel-dim: 0.82;

  /* 5. Shape */
  --bevel-radius-xs: 0.25rem;
  --bevel-radius-sm: 0.5rem;
  --bevel-radius-md: 0.625rem;
  --bevel-radius-lg: 1rem;
  --bevel-radius-xl: 1.5rem;
  --bevel-stitch-width: 1.5px;
  --bevel-stitch-inset: 0.375rem;
  /* Amounts: the figure, its secondary parts (currency, cents), labels, fine print. */
  --bevel-amount: 2.25rem;
  --bevel-amount-minor: 1.25rem;
  --bevel-label: 0.75rem;
  --bevel-fine: 0.6875rem;
  --bevel-tracking-label: 0.08em; /* stamped labels */
  --bevel-tracking-print: 0.06em; /* printed marks on cards */

  /* Paper and ink */
  --bevel-paper: oklch(0.975 0.008 85);
  --bevel-paper-foreground: oklch(0.28 0.02 260);
  --bevel-paper-muted: oklch(0.48 0.015 260);
  --bevel-paper-rule: oklch(0.78 0.04 240 / 0.45);
  --bevel-paper-margin: oklch(0.68 0.14 25 / 0.45);
  --bevel-fibre: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9 .35' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .18 0 0 0 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23f)'/%3E%3C/svg%3E");
  /* Ink soaks unevenly: mostly solid with pale specks. Used as a mask. */
  --bevel-ink-texture: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='i'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -2.4 0 0 0 2.1'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23i)'/%3E%3C/svg%3E");
  --bevel-ink-red: oklch(0.52 0.19 27);
  --bevel-ink-blue: oklch(0.44 0.14 262);
  --bevel-ink-green: oklch(0.5 0.12 155);
  --bevel-ink-black: oklch(0.3 0.01 260);
  --bevel-ink-amber: oklch(0.55 0.13 65);

  /* Brass and ivory: instrument hardware and dial faces */
  --bevel-brass: oklch(0.76 0.11 82);
  --bevel-brass-edge: oklch(0.52 0.08 70);
  --bevel-ivory: oklch(0.95 0.025 90);
  --bevel-ivory-foreground: oklch(0.25 0.015 60);
  --bevel-needle: oklch(0.55 0.2 27);

  /* Desk stationery: legal pads, pens, pencils, exhibit stickers */
  --bevel-pad: oklch(0.95 0.075 98); /* yellow legal pad */
  --bevel-pad-foreground: oklch(0.27 0.03 255);
  --bevel-pad-rule: oklch(0.72 0.06 235 / 0.45);
  --bevel-pad-margin: oklch(0.62 0.16 25 / 0.55);
  --bevel-pen-red: oklch(0.52 0.2 27); /* correcting pen */
  --bevel-pen-blue: oklch(0.42 0.15 262); /* writing pen */
  --bevel-pencil: oklch(0.55 0.01 260); /* not written in ink yet */
  --bevel-sticker: oklch(0.9 0.12 95); /* exhibit sticker */
  --bevel-sticker-foreground: oklch(0.26 0.03 70);
  /* Handwriting. Bring a marker font (e.g. Permanent Marker) for the full effect; these are fallbacks. */
  --bevel-font-marker: "Permanent Marker", "Marker Felt", "Chalkboard SE", ui-rounded, "Arial Rounded MT Bold", system-ui, sans-serif;
}

.dark {
  --bevel-highlight: oklch(1 0 0 / 0.14);
  /* Paper under dim light, not inverted: it's still paper. */
  --bevel-paper: oklch(0.88 0.008 85);
  --bevel-ivory: oklch(0.86 0.022 90);
  --bevel-pad: oklch(0.86 0.07 98);
  --bevel-cast: oklch(0 0 0 / 0.55);
}

/* Depth */
@utility bevel-recessed {
  background-color: var(--bevel-material-recess);
  box-shadow: var(--bevel-depth-recessed);
}
@utility bevel-flush {
  box-shadow: var(--bevel-depth-flush);
}
@utility bevel-raised {
  background-color: color-mix(in oklch, var(--bevel-material), white 7%);
  background-image: linear-gradient(to bottom, var(--bevel-highlight), transparent 60%);
  box-shadow: var(--bevel-depth-raised);
}
@utility bevel-pressed {
  background-color: color-mix(in oklch, var(--bevel-material), black 4%);
  background-image: none;
  box-shadow: var(--bevel-depth-pressed);
}
@utility bevel-object {
  box-shadow: var(--bevel-depth-object);
}

/* Materials */
@utility bevel-leather {
  background-color: var(--bevel-material);
  background-image:
    var(--bevel-grain),
    linear-gradient(to bottom, var(--bevel-highlight), transparent 28%, transparent 72%, var(--bevel-shade));
  background-size: var(--bevel-grain-size) var(--bevel-grain-size), 100% 100%;
  background-blend-mode: soft-light, normal;
}
@utility bevel-plastic {
  background-color: var(--bevel-material);
  background-image:
    linear-gradient(115deg, var(--bevel-highlight-strong), transparent 40%),
    linear-gradient(to bottom, transparent 25%, oklch(0 0 0 / 0.45));
  box-shadow: var(--bevel-depth-sheet);
}
@utility bevel-metal {
  background-color: var(--bevel-material);
  background-image:
    linear-gradient(to bottom, var(--bevel-highlight-strong), transparent 45%, var(--bevel-shade) 100%),
    repeating-linear-gradient(90deg, oklch(1 0 0 / 0.06) 0 1px, transparent 1px 3px);
  box-shadow:
    inset 0 0 0 1px oklch(0 0 0 / 0.25),
    inset 0 1px 0 var(--bevel-highlight-strong);
}

/* Details */
@utility bevel-deboss {
  text-shadow: var(--bevel-deboss);
}
@utility bevel-stitch {
  border-color: var(--bevel-stitch, oklch(0.88 0.05 82 / 0.8));
  border-style: dashed;
  border-width: var(--bevel-stitch-width);
  filter: drop-shadow(0 1px 0 var(--bevel-shade));
}
/* A lit fill sitting in a recess (meters, progress). Colour from --bevel-fill. */
@utility bevel-fill {
  background-color: var(--bevel-fill);
  background-image: linear-gradient(to bottom, oklch(1 0 0 / 0.55), transparent 55%, oklch(0 0 0 / 0.18));
  box-shadow: 0 0 6px -1px var(--bevel-fill);
}
/* A small indicator light. Colour from --bevel-led. */
@utility bevel-led {
  background-color: var(--bevel-led);
  background-image: radial-gradient(circle at 35% 30%, oklch(1 0 0 / 0.85), transparent 45%);
  box-shadow:
    0 0 6px var(--bevel-led),
    inset 0 -1px 1px oklch(0 0 0 / 0.35),
    0 1px 0 var(--bevel-highlight);
}

/* Paper: a sheet resting on the surface, with fibre in it. */
@utility bevel-paper {
  background-color: var(--bevel-paper);
  background-image: var(--bevel-fibre);
  background-size: 240px 240px;
  color: var(--bevel-paper-foreground);
  box-shadow:
    0 1px 1px var(--bevel-cast),
    0 6px 14px -4px var(--bevel-cast);
}
/* Ink on paper: multiplies into the surface and soaks unevenly. Colour from --bevel-ink. */
@utility bevel-ink {
  color: var(--bevel-ink, var(--bevel-ink-red));
  border-color: currentColor;
  mix-blend-mode: multiply;
  mask-image: var(--bevel-ink-texture);
  mask-size: 160px 160px;
}
/* Glass over an instrument window: one reflection from the light above. Put on an overlay element. */
@utility bevel-glass {
  pointer-events: none;
  background-image: linear-gradient(165deg, var(--bevel-highlight-strong) 0%, transparent 38%, transparent 70%, var(--bevel-shade) 100%);
}

/* Material families: one per screen. Set on the screen's container. */
[data-bevel-family="leather"] {
  --bevel-cast: oklch(0.25 0.03 50 / 0.22);
}
[data-bevel-family="paper"] {
  --bevel-cast: oklch(0.3 0.01 250 / 0.16);
}
.dark :is([data-bevel-family="leather"], [data-bevel-family="paper"]) {
  --bevel-cast: oklch(0 0 0 / 0.55);
}

/*
 * Ruled paper: rules every --bevel-rule-height and a margin line at
 * --bevel-rule-margin. Set --bevel-sheet for the paper colour. The ruling
 * scrolls with the content.
 */
@utility bevel-ruled {
  background-color: var(--bevel-sheet, var(--bevel-paper));
  background-image:
    linear-gradient(
      to right,
      transparent calc(var(--bevel-rule-margin) - 1px),
      var(--bevel-sheet-margin, var(--bevel-paper-margin)) calc(var(--bevel-rule-margin) - 1px) calc(var(--bevel-rule-margin) + 1px),
      transparent calc(var(--bevel-rule-margin) + 1px)
    ),
    repeating-linear-gradient(
      to bottom,
      transparent 0 calc(var(--bevel-rule-height) - 1px),
      var(--bevel-sheet-rule, var(--bevel-paper-rule)) calc(var(--bevel-rule-height) - 1px) var(--bevel-rule-height)
    ),
    var(--bevel-fibre);
  background-size: 100% 100%, 100% 100%, 240px 240px;
  background-attachment: local;
  color: var(--bevel-paper-foreground);
  box-shadow:
    0 1px 1px var(--bevel-cast),
    0 6px 14px -4px var(--bevel-cast);
}

  3. Copy activity-log.tsx into components/ui.

    components/activity-log.tsx
    "use client"

import * as React from "react"
import { cn } from "cn"

/** A docket of what an agent did. Give it an aria-label. */
function ActivityLog({ className, ...props }: React.ComponentProps<"section">) {
  return (
    <section
      data-slot="activity-log"
      className={cn("bevel-paper flex w-full flex-col rounded-(--bevel-radius-xs) text-sm", className)}
      {...props}
    />
  )
}

function ActivityLogTitle({ className, ...props }: React.ComponentProps<"h3">) {
  return (
    <h3
      data-slot="activity-log-title"
      className={cn(
        "border-b border-(--bevel-paper-rule) px-4 py-3 text-(length:--bevel-label) font-semibold tracking-(--bevel-tracking-label) uppercase",
        className
      )}
      {...props}
    />
  )
}

const LogContext = React.createContext<{ mountedRef: React.RefObject<boolean> }>({
  mountedRef: { current: false },
})

type ActivityLogEntriesProps = React.ComponentProps<"div"> & {
  /** Keep the newest entry in view, but only if the reader was already at the bottom. */
  stickToBottom?: boolean
}

/**
 * The entries, oldest first. A live log: screen readers hear new entries
 * politely. Scrolls once it's taller than --activity-log-height.
 */
function ActivityLogEntries({ className, stickToBottom = true, children, ...props }: ActivityLogEntriesProps) {
  const ref = React.useRef<HTMLDivElement>(null)
  const atBottom = React.useRef(true)
  const mountedRef = React.useRef(false)
  const count = React.Children.count(children)

  React.useEffect(() => {
    mountedRef.current = true
  }, [])

  React.useLayoutEffect(() => {
    const el = ref.current
    if (el && stickToBottom && atBottom.current) el.scrollTop = el.scrollHeight
  }, [count, stickToBottom])

  const context = React.useMemo(() => ({ mountedRef }), [])

  return (
    <LogContext value={context}>
      <div
        ref={ref}
        role="log"
        tabIndex={0}
        data-slot="activity-log-entries"
        onScroll={(event) => {
          const el = event.currentTarget
          atBottom.current = el.scrollHeight - el.scrollTop - el.clientHeight < 8
        }}
        className={cn(
          "max-h-(--activity-log-height) overflow-y-auto overscroll-contain rounded-b-(--bevel-radius-xs) outline-none focus-visible:ring-2 focus-visible:ring-(--bevel-pen-blue)/40",
          className
        )}
        {...props}
      >
        {children}
      </div>
    </LogContext>
  )
}

type ActivityLogKind = "thought" | "action" | "question" | "response" | "error"

const kindText: Record<ActivityLogKind, string> = {
  thought: "Thought",
  action: "Action",
  question: "Question",
  response: "Response",
  error: "Error",
}

type ActivityLogEntryProps = React.ComponentProps<"div"> & {
  kind?: ActivityLogKind
  /** When it happened, as shown. Pass a dateTime for machines. */
  time?: React.ReactNode
  dateTime?: string
}

/**
 * One entry: when, what kind, and what. Questions waiting on a person are
 * highlighted. Entries added after the log renders print in.
 */
function ActivityLogEntry({
  className,
  kind = "action",
  time,
  dateTime,
  children,
  ...props
}: ActivityLogEntryProps) {
  const { mountedRef } = React.useContext(LogContext)
  const [prints] = React.useState(() => mountedRef.current)
  return (
    <div
      data-slot="activity-log-entry"
      data-kind={kind}
      data-enter={prints ? "" : undefined}
      className={cn(
        "grid grid-cols-[var(--activity-log-time)_var(--activity-log-kind)_minmax(0,1fr)] items-baseline gap-x-2 border-b border-(--bevel-paper-rule) px-4 py-2.5 last:border-b-0",
        "data-[kind=question]:bg-(--activity-log-question)",
        "transition-[translate,opacity] duration-(--bevel-duration-move) ease-(--bevel-ease-out) motion-reduce:transition-none",
        "data-enter:starting:-translate-y-(--activity-log-print-in) data-enter:starting:opacity-0",
        className
      )}
      {...props}
    >
      <time
        dateTime={dateTime}
        className="font-mono text-(length:--bevel-fine) text-(--bevel-paper-muted) tabular-nums"
      >
        {time}
      </time>
      <span className="text-(length:--bevel-fine) font-bold tracking-(--bevel-tracking-print) text-(--activity-log-ink) uppercase">
        {kindText[kind]}
      </span>
      <div
        className={cn(
          "flex min-w-0 flex-wrap items-baseline gap-x-2 gap-y-1 text-(--bevel-paper-foreground)",
          kind === "thought" && "text-(--bevel-pencil) italic"
        )}
      >
        {children}
      </div>
    </div>
  )
}

export { ActivityLog, ActivityLogTitle, ActivityLogEntries, ActivityLogEntry }
export type { ActivityLogKind, ActivityLogEntryProps }

  4. Copy activity-log.css into your styles.

    styles/activity-log.css
    /*
 * Activity log: a docket of what an agent did, entry by entry. Builds on
 * bevel.css (paper, pens, pencil, ink, motion).
 */

:root {
  --activity-log-height: 22rem; /* the page scrolls past this */
  --activity-log-time: 3.25rem; /* time column */
  --activity-log-kind: 5.5rem; /* kind column */
  --activity-log-print-in: 0.5em;
  --activity-log-question: oklch(0.93 0.1 95 / 0.55); /* a question for you is highlighted */
}

[data-slot="activity-log-entry"] {
  --activity-log-ink: var(--bevel-paper-foreground);
}
[data-slot="activity-log-entry"][data-kind="thought"] {
  --activity-log-ink: var(--bevel-pencil);
}
[data-slot="activity-log-entry"][data-kind="action"] {
  --activity-log-ink: var(--bevel-pen-blue);
}
[data-slot="activity-log-entry"][data-kind="question"] {
  --activity-log-ink: var(--bevel-ink-amber);
}
[data-slot="activity-log-entry"][data-kind="error"] {
  --activity-log-ink: var(--bevel-pen-red);
}

  5. Import the stylesheets after Tailwind in your global CSS, foundation first.

    globals.css
    @import "./bevel.css";
@import "./activity-log.css";

Anatomy

Each part is its own component. Leave out the ones you don't need.

Anatomy
<ActivityLog aria-label="Agent activity">
  <ActivityLogTitle />
  <ActivityLogEntries>
    <ActivityLogEntry kind="action" time="14:02" />
  </ActivityLogEntries>
</ActivityLog>

Parts

PartRendersWhat it does
ActivityLogsectionThe docket page. Give it an aria-label.
ActivityLogEntriesdiv (log)A live log: new entries are announced politely. Scrolls past --activity-log-height and follows new entries only while you're at the bottom.
ActivityLogEntrydivkind: thought, action, question, response or error (shown in words), time and dateTime. Entries added later print in.