Bevel

Mixer strip

One channel of a mixing console per agent or source: its name, mute and solo keys, and a motorized fader that an orchestrator can move and you can take. For balancing subagents, models or data sources.

Subagents on a console

A lead agent rebalances effort as it goes. Take a fader to override it; mute pauses a subagent, solo runs one alone.

Running: Research, Code, Tests, Docs

Built from

Mixer strip is made of components that also work on their own.

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 Mixer strip. This brings in Motorized fader and the Bevel foundation, installs @base-ui/react and cn, and merges the styles into your global CSS.

    Terminal
    npx shadcn@latest add @bevel/mixer-strip
Install manually

  1. Install the dependencies.

    Terminal
    pnpm add @base-ui/react 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. Install the components Mixer strip is built from: Motorized fader.

  4. Copy mixer-strip.tsx into components/ui.

    components/mixer-strip.tsx
    "use client"

import * as React from "react"
import { Toggle } from "@base-ui/react/toggle"
import { cn } from "cn"
import { MotorizedFader, type MotorizedFaderProps } from "@/components/ui/motorized-fader"

type MixerStripContextValue = { name: string; muted: boolean }

const MixerStripContext = React.createContext<MixerStripContextValue | null>(null)

function useMixerStrip() {
  const context = React.useContext(MixerStripContext)
  if (!context) throw new Error("MixerStrip parts must be inside <MixerStrip>")
  return context
}

/** A row of strips: one console. */
function Mixer({ className, ...props }: React.ComponentProps<"div">) {
  return (
    <div
      role="group"
      data-slot="mixer"
      className={cn("flex max-w-full gap-1 overflow-x-auto p-1", className)}
      {...props}
    />
  )
}

type MixerStripProps = React.ComponentProps<"div"> & {
  /** The channel's name: an agent, a source, a model. Names the group and its controls. */
  name: string
  /** Dims the strip. Pass the same value as MixerStripMute's pressed. */
  muted?: boolean
}

/** One channel: a name, mute and solo, and a fader. */
function MixerStrip({ className, name, muted = false, children, ...props }: MixerStripProps) {
  return (
    <MixerStripContext value={{ name, muted }}>
      <div
        role="group"
        aria-label={name}
        data-slot="mixer-strip"
        data-muted={muted ? "" : undefined}
        className={cn(
          "bevel-metal flex w-20 shrink-0 flex-col items-center gap-2 rounded-(--bevel-radius-sm) px-2 py-3",
          className
        )}
        {...props}
      >
        {children}
      </div>
    </MixerStripContext>
  )
}

/** The scribble strip: the channel's name, lit. */
function MixerStripName({ className, ...props }: React.ComponentProps<"p">) {
  const { name } = useMixerStrip()
  return (
    <p
      aria-hidden
      data-slot="mixer-strip-name"
      className={cn(
        "w-full truncate rounded-(--bevel-radius-xs) bg-(--mixer-strip-scribble) px-1 py-1 text-center font-mono text-xs text-(--mixer-strip-scribble-foreground) shadow-(--bevel-depth-recessed)",
        "transition-opacity duration-(--bevel-duration-small) in-data-muted:opacity-40 motion-reduce:transition-none",
        className
      )}
      {...props}
    >
      {name}
    </p>
  )
}

const keyClass = cn(
  "bevel-raised h-7 w-full rounded-(--bevel-radius-xs) text-(length:--bevel-fine) font-black tracking-(--bevel-tracking-label) text-(--bevel-ivory) uppercase outline-none",
  "transition-[translate,box-shadow] duration-(--bevel-duration-press) ease-(--bevel-ease-out) motion-reduce:transition-none",
  "data-pressed:translate-y-px data-pressed:text-(--mixer-strip-lit-foreground)",
  "focus-visible:ring-3 focus-visible:ring-ring/60 data-disabled:opacity-50"
)

/** Mute: a toggle, named “Mute <name>”. */
function MixerStripMute({ className, ...props }: Toggle.Props) {
  const { name } = useMixerStrip()
  return (
    <Toggle aria-label={`Mute ${name}`} data-slot="mixer-strip-mute" className={cn(keyClass, className)} {...props}>
      M
    </Toggle>
  )
}

/** Solo: a toggle, named “Solo <name>”. What solo silences is up to you. */
function MixerStripSolo({ className, ...props }: Toggle.Props) {
  const { name } = useMixerStrip()
  return (
    <Toggle aria-label={`Solo ${name}`} data-slot="mixer-strip-solo" className={cn(keyClass, className)} {...props}>
      S
    </Toggle>
  )
}

/** The channel's motorized fader, named “<name> level”. */
function MixerStripFader({ className, ...props }: MotorizedFaderProps) {
  const { name } = useMixerStrip()
  return (
    <MotorizedFader
      aria-label={`${name} level`}
      className={cn("transition-opacity duration-(--bevel-duration-small) in-data-muted:opacity-60 motion-reduce:transition-none", className)}
      {...props}
    />
  )
}

export { Mixer, MixerStrip, MixerStripName, MixerStripMute, MixerStripSolo, MixerStripFader }
export type { MixerStripProps }

  5. Copy mixer-strip.css into your styles.

    styles/mixer-strip.css
    /*
 * Mixer strip: one channel of a console, per agent or source. A name on
 * the scribble strip, mute and solo keys, and a motorized fader.
 * Builds on bevel.css (metal, raised, led) and motorized-fader.css.
 */

:root {
  --mixer-strip-panel: oklch(0.32 0.01 260);
  --mixer-strip-panel-edge: oklch(0.22 0.01 260);
  --mixer-strip-key: oklch(0.42 0.01 260);
  --mixer-strip-mute: oklch(0.62 0.22 27);
  --mixer-strip-solo: oklch(0.84 0.16 90);
  --mixer-strip-lit-foreground: oklch(0.2 0.02 60);
  --mixer-strip-scribble: oklch(0.2 0.02 230);
  --mixer-strip-scribble-foreground: oklch(0.88 0.08 230);
}

[data-slot="mixer-strip"] {
  --bevel-material: var(--mixer-strip-panel);
  --bevel-material-edge: var(--mixer-strip-panel-edge);
}
[data-slot="mixer-strip-mute"],
[data-slot="mixer-strip-solo"] {
  --bevel-material: var(--mixer-strip-key);
}
[data-slot="mixer-strip-mute"][data-pressed] {
  --bevel-material: var(--mixer-strip-mute);
}
[data-slot="mixer-strip-solo"][data-pressed] {
  --bevel-material: var(--mixer-strip-solo);
}

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

    globals.css
    @import "./bevel.css";
@import "./mixer-strip.css";

Anatomy

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

Anatomy
<Mixer aria-label="Subagents">
  <MixerStrip name="Research" muted={muted}>
    <MixerStripName />
    <MixerStripMute pressed={muted} onPressedChange={setMuted} />
    <MixerStripSolo pressed={solo} onPressedChange={setSolo} />
    <MixerStripFader value={share} onValueChange={setShare} changedBy={by} />
  </MixerStrip>
</Mixer>

Parts

PartRendersWhat it does
Mixerdiv (group)A row of strips; scrolls sideways when narrow. Give it an aria-label.
MixerStripdiv (group)name labels the group and every control in it. muted dims it.
MixerStripNamepThe lit scribble strip with the name.
MixerStripMuteToggle“Mute Research”. Lit red when pressed.
MixerStripSoloToggle“Solo Research”. Lit yellow when pressed. What solo silences is up to you.
MixerStripFaderMotorizedFader“Research level”. Takes every MotorizedFader prop.