Features

import type { ReactNode } from "react";

// The parts every panel in this kit is made of. The corners of what is inside follow the panel's own.
const air = {
  panel: "flex w-(--tui-feature-card-width) max-w-full flex-col gap-(--tui-feature-card-gap) rounded-(--tui-feature-card-radius) bg-(--tui-feature-card-bg) p-(--tui-feature-card-padding) font-(family-name:--tui-font) text-(length:--tui-feature-card-font-size) leading-none text-(--tui-feature-card-fg) shadow-(--tui-feature-card-shadow)",
  head: "flex h-9 shrink-0 items-center justify-between gap-3 px-3 text-[0.93em] font-medium text-(--tui-feature-card-muted)",
  chip: "inline-flex h-5 min-w-5 shrink-0 items-center justify-center rounded-md bg-(--tui-feature-card-well) px-1.5 text-[0.8em] font-medium text-(--tui-feature-card-muted) tabular-nums",
  well: "rounded-[calc(var(--tui-feature-card-radius)_-_var(--tui-feature-card-padding))] bg-(--tui-feature-card-well)",
  detail: "text-[0.93em] leading-snug text-(--tui-feature-card-muted)",
  focus: "outline-none focus-visible:[outline:2px_solid_var(--tui-ring)] focus-visible:[outline-offset:2px]",
};

export interface FeaturesProps {
  /** A quiet label over the tiles. */
  label?: ReactNode;
  /** A small figure or key at the end of the label. */
  count?: ReactNode;
  /** A Feature for each thing. */
  children: ReactNode;
  className?: string;
}

/** What the product does, a tile to each thing, in one floating panel. */
export function Features({ label, count, children, className }: FeaturesProps) {
  return (
    <div data-slot="features" className={[air.panel, className].filter(Boolean).join(" ")}>
      {(label || count) && (
        <div className={air.head}>
          {label}
          {count && <span className={air.chip}>{count}</span>}
        </div>
      )}
      <ul className="m-0 grid list-none gap-(--tui-feature-card-gap) p-0 [grid-template-columns:repeat(var(--tui-feature-card-columns),minmax(0,1fr))]">{children}</ul>
    </div>
  );
}

export interface FeatureProps {
  /** A small drawing at the top of the tile. */
  icon?: ReactNode;
  title: ReactNode;
  /** A line under the title. Leave it out and the tile is an icon over a word. */
  children?: ReactNode;
  /** Somewhere to go. The whole tile becomes a link. */
  href?: string;
}

/** One thing the product does. With only an icon and a title it is centred, like a tool in a tray; with a line under it, it reads from the left. */
export function Feature({ icon, title, children, href }: FeatureProps) {
  const tile = ["flex h-full flex-col gap-2.5 p-(--tui-feature-card-tile-padding) text-(--tui-feature-card-fg) no-underline transition-colors duration-(--tui-duration)", children ? "items-start" : "items-center text-center", air.well, href ? "hover:bg-(--tui-feature-card-well-hover) " + air.focus : ""].join(" ");
  const inner = (
    <>
      {icon && (
        <span aria-hidden className="flex [&_svg]:size-(--tui-feature-card-icon-size)">
          {icon}
        </span>
      )}
      <span className="font-medium">{title}</span>
      {children && <span className={air.detail}>{children}</span>}
    </>
  );
  return (
    <li data-slot="feature">
      {href ? (
        <a href={href} className={tile}>
          {inner}
        </a>
      ) : (
        <div className={tile}>{inner}</div>
      )}
    </li>
  );
}

:root {
  color-scheme: light;
  --tui-bg: #ffffff;
  --tui-fg: #0a0a0a;
  --tui-muted: #f5f5f5;
  --tui-muted-fg: #737373;
  --tui-border: #e5e5e5;
  --tui-primary: #171717;
  --tui-primary-fg: #fafafa;
  --tui-ring: #a3a3a3;
  --tui-success: #16a34a;
  --tui-warning: #d97706;
  --tui-danger: #dc2626;
  --tui-radius: 8px;
  --tui-border-width: 1px;
  --tui-space: 4px;
  --tui-shadow: none;
  --tui-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --tui-text: 14px;
  --tui-duration: 150ms;

  /* Features */
  --tui-feature-card-width: 460px;
  --tui-feature-card-padding: calc(var(--tui-space) * 2);
  --tui-feature-card-gap: calc(var(--tui-space) * 1.5);
  --tui-feature-card-radius: calc(var(--tui-radius) * 3.25);
  --tui-feature-card-font-size: var(--tui-text);
  --tui-feature-card-bg: light-dark(var(--tui-bg), color-mix(in oklab, var(--tui-bg) 90%, var(--tui-fg)));
  --tui-feature-card-shadow: 0 0 0 1px color-mix(in srgb, var(--tui-fg) 5%, transparent), 0 2px 6px rgb(0 0 0 / 0.04), 0 16px 40px rgb(0 0 0 / 0.1);
  --tui-feature-card-fg: var(--tui-fg);
  --tui-feature-card-muted: var(--tui-muted-fg);
  --tui-feature-card-well: color-mix(in srgb, light-dark(var(--tui-bg), color-mix(in oklab, var(--tui-bg) 90%, var(--tui-fg))) 94%, var(--tui-fg));
  --tui-feature-card-well-hover: color-mix(in srgb, light-dark(var(--tui-bg), color-mix(in oklab, var(--tui-bg) 90%, var(--tui-fg))) 90%, var(--tui-fg));
  --tui-feature-card-columns: 2;
  --tui-feature-card-tile-padding: calc(var(--tui-space) * 4);
  --tui-feature-card-icon-size: 20px;
}

.dark,
[data-theme="dark"] {
  color-scheme: dark;
  --tui-bg: #0a0a0a;
  --tui-fg: #fafafa;
  --tui-muted: #1c1c1c;
  --tui-muted-fg: #a3a3a3;
  --tui-border: #2a2a2a;
  --tui-primary: #fafafa;
  --tui-primary-fg: #171717;
  --tui-ring: #737373;
  --tui-success: #22c55e;
  --tui-warning: #f59e0b;
  --tui-danger: #ef4444;
}