shadcn/typeset — Introducing shadcn/typeset

import React from "react";
import {
  AbsoluteFill,
  Easing,
  Sequence,
  Series,
  interpolate,
  useCurrentFrame,
  useVideoConfig,
} from "remotion";
import {
  TransitionSeries,
  linearTiming,
  type TransitionPresentation,
  type TransitionPresentationComponentProps,
} from "@remotion/transitions";
import { loadFont as loadSans } from "@remotion/google-fonts/Geist";
import { loadFont as loadMono } from "@remotion/google-fonts/GeistMono";
import { loadFont as loadSerif } from "@remotion/google-fonts/Lora";

import { ScaleDownFade } from "@/components/remocn/scale-down-fade";
import { ShortSlideRight } from "@/components/remocn/short-slide-right";
import { LineByLineSlide } from "@/components/remocn/line-by-line-slide";
import { RolodexFlip } from "@/components/remocn/rolodex-flip";

import { ShaderSimplexNoise } from "@/components/remocn/shader-simplex-noise";
import { ShaderDithering } from "@/components/remocn/shader-dithering";
import { ShaderSmokeRing } from "@/components/remocn/shader-smoke-ring";

// Geist regular only — the whole video never goes above weight 400, except
// inside the RAW "browser defaults" document, where the bold serif heading is
// the pain itself (a diegetic browser default, not our design).
const { fontFamily: SANS_FAMILY } = loadSans("normal", {
  subsets: ["latin"],
  weights: ["400"],
});
const { fontFamily: MONO_FAMILY } = loadMono("normal", {
  subsets: ["latin"],
  weights: ["400"],
});
// Lora appears exactly once — the docs' own typeset-reading example.
const { fontFamily: SERIF_FAMILY } = loadSerif("normal", {
  subsets: ["latin"],
  weights: ["400"],
});

const SANS = `${SANS_FAMILY}, -apple-system, BlinkMacSystemFont, sans-serif`;
const MONO = `${MONO_FAMILY}, ui-monospace, SFMono-Regular, monospace`;
const SERIF = `${SERIF_FAMILY}, Georgia, serif`;

// shadcn's own monochrome: zinc-950 canvas, ink foreground. The only color in
// the video lives inside shader covers — the same muted vaporwave set as the
// introducing-shadcn cut (deep plum, dusty rose).
const ZINC = "#09090b";
const INK = "#fafafa";
const MUTED = "rgba(250,250,250,0.62)";
const FAINT = "rgba(250,250,250,0.4)";

const PLUM = "#3d2547";
const ROSE = "#6b4054";

// The document page — a light surface so rendered markdown reads as a page.
const PAGE = "#ffffff";
const PAGE_INK = "#18181b";
const PAGE_MUTED = "#52525b";
const PAGE_HAIR = "#e4e4e7";

const clampOpts = {
  extrapolateLeft: "clamp" as const,
  extrapolateRight: "clamp" as const,
};

// ---------------------------------------------------------------------------
// Scene timings (frames @ 30fps). Transitions overlap.
// ---------------------------------------------------------------------------
const ELEMENT_BEAT = 30; // one element hard cut
// The last beat holds longer: the crossfade out overlaps its tail, so Code
// needs its own clean read time before the next scene rides in.
const ELEMENT_TAIL = 18;
const S_ELEMENTS = ELEMENT_BEAT * 5 + ELEMENT_TAIL;
const S_STYLED = 105; //  "You've styled them for the blog" (word swaps)
// Long enough that the line gets a full clean read BEFORE the smoke cover
// (72f) rides out over its tail.
const S_FIGHT = 130; //   "Every time, the same fight — sizing and spacing"
const S_MEET = 130; //    "This is shadcn/typeset"
const S_TAGLINE = 80; //  "Typography for HTML — from blog posts to streaming chat"
const S_ONCE = 66; //     "Style it once"
// Typed class="typeset" → the document breathes into set type. The morph
// lands around frame 79; a short beat of set-type read follows, then the
// hard cut into the controls scene keeps the document moving.
const S_ONECLASS = 112;
const S_CONTROLS = 200; //size / leading / flow flip, the document reflows live
const S_RHYTHM = 66; //   "We call it rhythm"
const PRESET_BEAT = 70; //one preset hard cut
const S_PRESETS = PRESET_BEAT * 3; // docs / chat / reading
const S_STREAM_TITLE = 62; // "Built for streaming"
const S_STREAM = 165; //  the chat reply streams block by block
const S_STREAM_CLAIM = 76; // "New blocks land — earlier ones never move"
const S_PILLARS = 100; // three claims accumulate
const S_YOURS = 70; //    "And the file is yours"
const S_OUTRO = 150; //   smoke ring → shadcn/typeset + motto

const T_SMOKE = 84; //    smoke-ring cover blooming through the cut
const T_DITHER = 40; //   dusty-rose dither dissolve (held mid-frame)
const T_X = 14; //        crossfade
const T_BLUR = 16; //     blur crossfade

// Readability scrim over the backdrop shader.
const Scrim: React.FC<{ strength?: number }> = ({ strength = 1 }) => (
  <AbsoluteFill
    style={{
      background: `radial-gradient(120% 120% at 50% 42%, rgba(9,9,11,${
        0.3 * strength
      }) 0%, rgba(9,9,11,${0.78 * strength}) 100%)`,
    }}
  />
);

// ===========================================================================
// The shared document — the same rendered-markdown page travels through the
// one-class snap, the rhythm controls, and the preset montage. `flow` is in
// em of `size`, exactly like --typeset-flow.
// ===========================================================================
const DOC_HEADING = "Working with rhythm";
const DOC_PARA =
  "Three values set the whole document — the size of the body, the leading between lines, and the flow between blocks.";
const DOC_LIST = ["One CSS file, no package", "Streaming-stable appends"];
const DOC_TABLE: Array<[string, string]> = [
  ["size", "1em"],
  ["leading", "1.75"],
  ["flow", "1.25em"],
];

const lerp = (a: number, b: number, t: number) => a + (b - a) * t;

// One font layer of the document. Geometry (sizes, line heights, margins,
// paddings) comes in SHARED between layers, so two stacked layers always have
// identical box heights — only letterforms, colors, weights, and border
// paints differ. That's what makes the raw→typeset crossfade morph clean.
const DocLayer: React.FC<{
  raw: boolean;
  serif: boolean;
  size: number;
  leading: number;
  flowPx: number;
  width: number;
  rawGeo: number; // 1 = cramped raw geometry, 0 = set geometry
  showList: boolean;
  showTable: boolean;
  opacity: number;
  absolute: boolean;
}> = ({
  raw,
  serif,
  size,
  leading,
  flowPx,
  width,
  rawGeo,
  showList,
  showTable,
  opacity,
  absolute,
}) => {
  const family = raw
    ? "Georgia, 'Times New Roman', serif"
    : serif
      ? SERIF
      : SANS;
  const cellPad = `${lerp(6, 3, rawGeo)}px ${lerp(2, 6, rawGeo)}px`;
  const listIndent = lerp(6, 30, rawGeo);
  const listGap = lerp(size * 0.35, 0, rawGeo);
  const dotSize = Math.max(4, size * lerp(0.3, 0.36, rawGeo));
  const hair = raw ? "#999999" : PAGE_HAIR;
  // Same border-box on both layers: the raw grid paints all four sides, the
  // set layer paints only the bottom rule — the rest stay transparent.
  const cellBorder = (bottomOnly: boolean) =>
    bottomOnly
      ? `1px solid transparent`
      : `1px solid ${hair}`;

  return (
    <div
      style={{
        position: absolute ? "absolute" : "relative",
        inset: absolute ? 0 : undefined,
        width,
        fontFamily: family,
        fontSize: size,
        lineHeight: leading,
        color: raw ? "#111111" : PAGE_MUTED,
        textAlign: "left",
        opacity,
      }}
    >
      <div
        style={{
          fontSize: size * 1.5,
          lineHeight: 1.25,
          color: raw ? "#000000" : PAGE_INK,
          fontWeight: raw ? 700 : 400,
          marginBottom: flowPx,
        }}
      >
        {DOC_HEADING}
      </div>
      <div>{DOC_PARA}</div>
      {showList ? (
        <div
          style={{
            marginTop: flowPx,
            display: "flex",
            flexDirection: "column",
            gap: listGap,
            paddingLeft: listIndent,
          }}
        >
          {DOC_LIST.map((item) => (
            <div
              key={item}
              style={{ display: "flex", alignItems: "center", gap: 11 }}
            >
              <span
                style={{
                  width: dotSize,
                  height: dotSize,
                  borderRadius: 999,
                  background: raw ? "#111111" : "#a1a1aa",
                  flexShrink: 0,
                }}
              />
              {item}
            </div>
          ))}
        </div>
      ) : null}
      {showTable ? (
        <table
          style={{
            marginTop: flowPx,
            borderCollapse: "collapse",
            width: "100%",
            fontSize: size * 0.94,
          }}
        >
          <thead>
            <tr>
              {["Control", "Default"].map((h) => (
                <th
                  key={h}
                  style={{
                    textAlign: "left",
                    fontWeight: raw ? 700 : 400,
                    color: raw ? "#000000" : PAGE_INK,
                    padding: cellPad,
                    border: cellBorder(!raw),
                    borderBottom: `1px solid ${hair}`,
                  }}
                >
                  {h}
                </th>
              ))}
            </tr>
          </thead>
          <tbody>
            {DOC_TABLE.map(([control, value]) => (
              <tr key={control}>
                <td
                  style={{
                    padding: cellPad,
                    border: cellBorder(!raw),
                    borderBottom: `1px solid ${raw ? hair : PAGE_HAIR}`,
                  }}
                >
                  {control}
                </td>
                <td
                  style={{
                    padding: cellPad,
                    fontFamily: raw ? family : MONO,
                    fontSize: raw ? undefined : size * 0.88,
                    border: cellBorder(!raw),
                    borderBottom: `1px solid ${raw ? hair : PAGE_HAIR}`,
                  }}
                >
                  {value}
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      ) : null}
    </div>
  );
};

const Doc: React.FC<{
  mode: "sans" | "serif";
  size: number;
  leading: number;
  flow: number;
  width: number;
  showList?: boolean;
  showTable?: boolean;
  /** 1 = raw browser-default paint (Georgia, bold, solid borders), 0 = set.
   *  Between the two, both font layers render stacked and crossfade. */
  rawMix?: number;
  /** 1 = cramped raw geometry (indents, cell padding), 0 = set geometry. */
  rawGeo?: number;
}> = ({
  mode,
  size,
  leading,
  flow,
  width,
  showList = true,
  showTable = true,
  rawMix = 0,
  rawGeo = 0,
}) => {
  const flowPx = size * flow;
  const shared = {
    serif: mode === "serif",
    size,
    leading,
    flowPx,
    width,
    rawGeo,
    showList,
    showTable,
  };

  return (
    <div style={{ position: "relative", width }}>
      {rawMix > 0.001 ? (
        <DocLayer {...shared} raw opacity={rawMix} absolute={false} />
      ) : null}
      {rawMix < 0.999 ? (
        <DocLayer
          {...shared}
          raw={false}
          opacity={1 - rawMix}
          absolute={rawMix > 0.001}
        />
      ) : null}
    </div>
  );
};

const Page: React.FC<{
  children: React.ReactNode;
  padding?: number | string;
  radius?: number;
}> = ({ children, padding = 30, radius = 14 }) => (
  <div
    style={{
      background: PAGE,
      borderRadius: radius,
      padding,
    }}
  >
    {children}
  </div>
);

// ===========================================================================
// Scene 1 — The elements. Five hard beats, each one word set as the element
// it names: the type IS the demo.
// ===========================================================================
const ElementEnter: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const frame = useCurrentFrame();
  const opacity = interpolate(frame, [0, 7], [0, 1], clampOpts);
  const x = interpolate(frame, [0, 10], [40, 0], {
    ...clampOpts,
    easing: Easing.out(Easing.cubic),
  });
  const blur = interpolate(frame, [0, 7], [6, 0], clampOpts);
  return (
    <AbsoluteFill style={{ alignItems: "center", justifyContent: "center" }}>
      <div
        style={{
          opacity,
          transform: `translateX(${x}px)`,
          filter: `blur(${blur}px)`,
          fontFamily: SANS,
          fontWeight: 400,
          color: INK,
        }}
      >
        {children}
      </div>
    </AbsoluteFill>
  );
};

const Greek: React.FC<{ w: number; h?: number; o?: number }> = ({
  w,
  h = 5,
  o = 0.2,
}) => (