Citation

pnpm add @base-ui/react cn

/*
 * 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);
}

"use client"

import * as React from "react"
import { Popover as PopoverPrimitive } from "@base-ui/react/popover"
import { cn } from "cn"
import { Stamp } from "@/components/ui/stamp"

/** A cited source. Wraps a trigger (the exhibit sticker) and the passage it opens. */
function Citation(props: PopoverPrimitive.Root.Props) {
  return <PopoverPrimitive.Root data-slot="citation" {...props} />
}

type CitationTriggerProps = PopoverPrimitive.Trigger.Props & {
  /** Sticker colour: yellow (the default), blue, or white. */
  tone?: "yellow" | "blue" | "white"
  /** The printed prefix on the sticker. */
  abbreviation?: string
  /** The prefix in full, read by screen readers instead of the abbreviation. */
  label?: string
}

/**
 * The exhibit sticker, inline in text: "Ex. 4". Read as "Exhibit 4". Opens
 * the source on click, Enter or Space.
 */
function CitationTrigger({
  className,
  tone = "yellow",
  abbreviation = "Ex.",
  label = "Exhibit",
  children,
  ...props
}: CitationTriggerProps) {
  return (
    <PopoverPrimitive.Trigger
      data-slot="citation-trigger"
      data-tone={tone}
      className={cn(
        "mx-0.5 inline-flex -translate-y-px rotate-(--citation-tilt) items-baseline gap-0.5 rounded-(--bevel-radius-xs) bg-(--citation-sticker) px-1 py-px align-baseline text-(length:--citation-size) leading-none font-bold text-(--bevel-sticker-foreground) shadow-(--bevel-depth-sheet) outline-none select-none",
        "cursor-pointer transition-[translate,rotate] duration-(--bevel-duration-small) ease-(--bevel-ease-out) motion-reduce:transition-none",
        "hover:-translate-y-0.5 data-popup-open:rotate-0 data-popup-open:-translate-y-0.5",
        "focus-visible:ring-2 focus-visible:ring-(--bevel-pen-blue)/60 focus-visible:ring-offset-1",
        "forced-colors:border forced-colors:border-[ButtonText]",
        className
      )}
      {...props}
    >
      <span aria-hidden className="text-(length:--citation-abbreviation-size) tracking-(--bevel-tracking-print) uppercase">
        {abbreviation}
      </span>
      <span className="sr-only">{label} </span>
      <span className="tabular-nums">{children}</span>
    </PopoverPrimitive.Trigger>
  )
}

/** The paper slip the sticker opens. Grows from the sticker. */
function CitationContent({
  className,
  children,
  side = "bottom",
  align = "start",
  sideOffset = 8,
  ...props
}: PopoverPrimitive.Popup.Props &
  Pick<PopoverPrimitive.Positioner.Props, "side" | "align" | "sideOffset">) {
  return (
    <PopoverPrimitive.Portal>
      <PopoverPrimitive.Positioner side={side} align={align} sideOffset={sideOffset} className="z-50">
        <PopoverPrimitive.Popup
          data-slot="citation-content"
          className={cn(
            "bevel-paper flex w-80 max-w-[calc(100vw-2rem)] origin-(--transform-origin) flex-col gap-2 rounded-(--bevel-radius-xs) p-4 text-sm outline-none",
            "transition-[scale,opacity] duration-(--bevel-duration-small) ease-(--bevel-ease-out) motion-reduce:transition-none",
            "data-starting-style:scale-(--citation-pop-scale) data-starting-style:opacity-0 data-ending-style:scale-(--citation-pop-scale) data-ending-style:opacity-0",
            className
          )}
          {...props}
        >
          {children}
        </PopoverPrimitive.Popup>
      </PopoverPrimitive.Positioner>
    </PopoverPrimitive.Portal>
  )
}

/** The source's name. Titles the slip for screen readers. */
function CitationSource({ className, ...props }: PopoverPrimitive.Title.Props) {
  return (
    <PopoverPrimitive.Title
      data-slot="citation-source"
      className={cn("font-semibold text-(--bevel-paper-foreground)", className)}
      {...props}
    />
  )
}

/** Where in the source: page, paragraph, clause. */
function CitationLocation({ className, ...props }: React.ComponentProps<"p">) {
  return (
    <p
      data-slot="citation-location"
      className={cn("font-mono text-(length:--bevel-fine) text-(--bevel-paper-muted)", className)}
      {...props}
    />
  )
}

/** The quoted passage, highlighted as if marked up by hand. */
function CitationQuote({ className, children, ...props }: React.ComponentProps<"blockquote">) {
  return (
    <blockquote
      data-slot="citation-quote"
      className={cn(
        "border-l-2 border-(--bevel-paper-rule) pl-3 leading-relaxed text-(--bevel-paper-foreground)",
        className
      )}
      {...props}
    >
      <mark className="box-decoration-clone bg-(--citation-highlight) px-0.5 text-inherit">
        {children}
      </mark>
    </blockquote>
  )
}

const statusStamp = {
  verified: { tone: "green", text: "Verified" },
  caution: { tone: "amber", text: "Caution" },
  unverified: { tone: "red", text: "Unverified" },
} as const

type CitationStatusProps = Omit<React.ComponentProps<typeof Stamp>, "tone" | "children"> & {
  /** Whether the source checks out. Always shown in words, never colour alone. */
  status: keyof typeof statusStamp
  /** Replace the stamped word. */
  children?: React.ReactNode
}

function CitationStatus({ status, className, children, ...props }: CitationStatusProps) {
  const stamp = statusStamp[status]
  return (
    <Stamp
      data-citation-status={status}
      tone={stamp.tone}
      className={cn("self-start", className)}
      {...props}
    >
      {children ?? stamp.text}
    </Stamp>
  )
}

/** Close the slip, or link onward to the full document. */
function CitationFooter({ className, ...props }: React.ComponentProps<"div">) {
  return (
    <div
      data-slot="citation-footer"
      className={cn("mt-1 flex items-center justify-between gap-3", className)}
      {...props}
    />
  )
}

export {
  Citation,
  CitationTrigger,
  CitationContent,
  CitationSource,
  CitationLocation,
  CitationQuote,
  CitationStatus,
  CitationFooter,
}
export type { CitationTriggerProps, CitationStatusProps }

/*
 * Citation: an exhibit sticker in the text that opens the cited passage on
 * a paper slip. Builds on bevel.css (sticker, paper, ink, motion).
 */

:root {
  --citation-tilt: -2deg;
  --citation-size: 0.75em; /* the sticker, relative to the text it sits in */
  --citation-abbreviation-size: 0.8em;
  --citation-highlight: oklch(0.93 0.13 100 / 0.75); /* highlighter over the quoted passage */
  --citation-sticker-blue: oklch(0.86 0.06 240);
  --citation-sticker-white: oklch(0.97 0.004 90);
  --citation-pop-scale: 0.96; /* the slip starts slightly small, from the sticker */
}

[data-slot="citation-trigger"] {
  --citation-sticker: var(--bevel-sticker);
}
[data-slot="citation-trigger"][data-tone="blue"] {
  --citation-sticker: var(--citation-sticker-blue);
}
[data-slot="citation-trigger"][data-tone="white"] {
  --citation-sticker: var(--citation-sticker-white);
}

@import "./bevel.css";
@import "./citation.css";