doormile_customer_app/lib/ui/tokens.dart

import 'package:flutter/material.dart';

/// Design tokens. Every colour, radius, shadow and text style in the app comes
/// from here — screens never hardcode a value.
///
/// Direction (2026-09-15 rebuild, from the 14-screen design):
///
/// **Edges, not elevation.** Surfaces are separated by a 1px warm hairline and
/// a 10pt radius, not by a shadow. The only shadows left in the system are the
/// crimson glow under the one committing action on a screen, the float under a
/// control that genuinely hovers over a map, and the sheet lift. A screen that
/// drops shadows everywhere has no way left to say "this one matters".
///
/// **One accent, three intensities.** Crimson fills the header and the primary
/// action, washes (`brandSoft` over `brandLine`) carry supporting information,
/// and everything else is warm neutral. There is no second hue competing for
/// meaning — `ok` survives only for the delivered state, `danger` only for
/// destructive text.
///
/// **Poppins for voice, Geist Mono for data.** Headings run at w800 with tight
/// negative tracking; anything a customer might read back aloud or check
/// digit-by-digit — a booking reference, a phone number, a fare, a plate, a
/// countdown — is set in mono so the glyphs line up and a transposed character
/// is visible.
class DmColors {
  DmColors._();

  // ── Brand ────────────────────────────────────────────────────────────────
  /// The mark's single colour.
  ///
  /// Briefly brightened to a vermilion on 2026-09-23 to match a reference
  /// design and put straight back. The palette is not up for redesign — the
  /// reference's *layout* is what the app is being drawn against, and the
  /// oxblood carries it perfectly well.
  static const brand = Color(0xFF8F0F06);

  /// Pressed state, and brand text sitting on a [brandSoft] wash where the
  /// full brand would vibrate against the tint.
  static const brandPress = Color(0xFF730C05);
  static const brandDeep = brandPress;

  /// The lit edge of the sphere and of the primary button's gradient. Named
  /// rather than repeated as a literal in three files.
  static const brandLit = Color(0xFFA6180B);

  /// What the launch fills the screen with, before anything else exists.
  ///
  /// ── Why this is not [brand] ──
  ///
  /// It is the launcher icon's own crimson, and it matches on purpose: the
  /// customer taps a red tile and the screen fills with that same red, which
  /// reads as one continuous gesture rather than as an app starting up. [brand]
  /// is the UI's red and is four shades deeper; using it here would make the
  /// tap and the screen after it two different colours for no reason a customer
  /// could name.
  ///
  /// The two never appear together — the splash has inverted to white before a
  /// single piece of UI is drawn.
  ///
  /// Mirrored in `android/app/src/main/res/values/colors.xml` as `dm_splash_bg`
  /// and in `ios/Runner/Base.lproj/LaunchScreen.storyboard`, because the window
  /// is painted this colour from process start — long before Flutter can.
  static const splash = Color(0xFFBD0921);

  /// Tint behind selected options, wash cards and brand chips.
  static const brandSoft = Color(0xFFFBF3F2);

  /// The wash's own edge, and the outline on quiet brand buttons.
  static const brandLine = Color(0xFFF0DEDC);

  // ── Ink — warm neutrals, never pure black ────────────────────────────────
  static const ink = Color(0xFF191716);
  static const ink2 = Color(0xFF5C5654);
  static const ink3 = Color(0xFF6E6864);
  static const ink4 = Color(0xFFB4AEAA);

  // ── Surfaces ─────────────────────────────────────────────────────────────
  /// The page canvas. White.
  ///
  /// ── This has been both, and the trade is real ──
  ///
  /// It was `#F7F6F4`, then deepened to `#F1F0EC` on 2026-09-23 so a white
  /// card would sit *on* something and the 1px edge could go quiet. That
  /// worked, and it also made every screen read as slightly dull — which is
  /// the note that brought it here.
  ///
  /// You cannot have a white page and borderless cards: one of them has to do
  /// the separating. On white, [DmCard] is held by its border and
  /// [DmShadow.card] rather than by contrast, which is the iOS and Revolut
  /// shape rather than the Airbnb one. That is the choice, made deliberately.
  ///
  /// Everything that needs to read as *recessed* — filled inputs, the
  /// segmented groove, a sunken card — moved to [surfaceAlt] and [groove],
  /// which are the only tokens still darker than the page.
  static const canvas = Color(0xFFFFFFFF);
  static const surface = Color(0xFFFFFFFF);

  /// Filled inputs, quiet chips, tiles, skeleton bases, the "sunken" card and
  /// the sunken treatment for a disabled primary action.
  ///
  /// With a white canvas this is the *only* thing that makes a surface read as
  /// recessed, so it carries more weight than it used to. It was within a
  /// point of the old canvas, which is why the groove below had to exist at
  /// all; on white it does its own job again.
  static const surfaceAlt = Color(0xFFF4F2EF);

  /// The bed a segmented control's chosen segment is raised out of.
  ///
  /// A step below [surfaceAlt], which is within a point of the canvas and so
  /// drew no groove at all on a sheet. A segment only reads as *raised* if
  /// there is something visible for it to be raised out of.
  static const groove = Color(0xFFE7E4E0);

  /// Barely-there divider between rows inside one card.
  static const hairline = Color(0xFFF1EFEC);

  /// A card's own edge — the workhorse of this design.
  static const border = Color(0xFFE8E5E2);

  // ── On-brand text ────────────────────────────────────────────────────────
  /// Secondary text on a crimson field. Not white-at-opacity: a tinted rose
  /// keeps its warmth where translucent white goes grey and dirty.
  static const onBrand2 = Color(0xFFFFD9D4);

  /// Tertiary text on a crimson field.
  static const onBrand3 = Color(0xFFFFD1CB);

  /// Recessed track inside the header (the segmented control's bed).
  static const onBrandSunken = Color(0x24000000);

  /// A control resting on the crimson field.
  static const onBrandRaise = Color(0x2EFFFFFF);

  // ── Semantic ─────────────────────────────────────────────────────────────
  static const ok = Color(0xFF0A6B56);
  static const okSoft = Color(0xFFE2F4EF);
  static const danger = Color(0xFFB3231F);

  /// "You are here" on a map. Deliberately not the brand crimson — on a map
  /// crimson means the pickup pin, and blue is the convention every customer
  /// already reads as their own position.
  static const locationDot = Color(0xFF1B6EF3);
  static const locationHalo = Color(0x241B6EF3);

  static const scrim = Color(0x80191716);

  // Backwards-compatible aliases used across the widget layer.
  static const bg = canvas;
  static const surface2 = surfaceAlt;
  static const line = hairline;
  static const lineStrong = border;
}

class DmRadius {
  DmRadius._();

  // Every corner was opened up on 2026-09-22. At 8–12 the app measured
  // correct and looked like a form: a screen of tight rectangles, which is
  // exactly the "boxy" the redesign was called in to fix. Four points across
  // the scale is the difference between a panel and a card, and it costs
  // nothing but the token.

  /// Tiles, chips, the small square that holds a glyph.
  static const xs = 10.0;

  /// Buttons, fields, icon buttons. The design's most-used corner.
  static const sm = 12.0;

  /// Cards and every panel that holds rows.
  static const md = 18.0;

  /// A card that stands alone on the canvas rather than in a stack of rows.
  /// Wider than [md] because a shadowed card with no edge needs the corner to
  /// carry the shape the border used to.
  static const card = 20.0;

  /// A chip: a status pill, a tier badge, a stat tile's glyph well.
  static const chip = 8.0;

  /// Sheets' grabber area, the segmented control, the header's bottom sweep.
  static const lg = 16.0;

  /// Bottom sheets and the auth sheet that overlaps the hero. Moved with the
  /// scale — at 16 it had collided with [lg], and a sheet that shares a corner
  /// with the cards inside it has stopped being a separate surface.
  static const xl = 20.0;

  /// The brand header's bottom corners.
  static const header = 26.0;

  static const pill = 999.0;

  /// A primary bar's corner. Softer than a field's, because the committing
  /// action is the one element on a screen allowed to look like an object
  /// rather than part of the form.
  static const book = 16.0;

  static BorderRadius all(double r) => BorderRadius.circular(r);
}

class DmSpace {
  DmSpace._();

  /// Horizontal page padding.
  ///
  /// 24 once, when the header was a crimson field and the canvas held loose
  /// rows. On a page of white cards it left a broad margin down both sides and
  /// the cards read as narrower than the screen — the reference designs this
  /// was drawn against run their cards to within about a finger of the edge.
  static const pad = 16.0;
  static const headerPad = 16.0;

  /// Minimum touch target.
  static const tap = 48.0;

  /// Primary button height.
  static const button = 54.0;

  /// Field height — matched to [button] so a form and its action share a rhythm.
  static const field = 54.0;
}

class DmShadow {
  DmShadow._();

  /// Under the one committing action on a screen, and under a selected slot.
  static const lift = [
    BoxShadow(
      color: Color(0x808F0F06),
      blurRadius: 24,
      spreadRadius: -12,
      offset: Offset(0, 10),
    ),
  ];

  /// A smaller version of [lift] for chips and half-width controls.
  static const liftSm = [
    BoxShadow(
      color: Color(0xA68F0F06),
      blurRadius: 16,
      spreadRadius: -8,
      offset: Offset(0, 7),
    ),
  ];

  /// A card resting on the canvas.
  ///
  /// ── Why the cards stopped having edges ──
  ///
  /// Every surface in this app was separated by a 1px hairline, which is
  /// honest and cheap and, repeated eight times down a screen, reads as a
  /// wireframe: the outline is the loudest thing about an object whose whole
  /// job is to be quiet and hold something else.
  ///
  /// Two very soft layers do it instead — a wide, faint ambient wash and a
  /// short contact shadow just under the shape. Neither is visible as a
  /// shadow; together they lift the white off the warm canvas so the card is
  /// read as *nearer* rather than as *outlined*. That is the difference
  /// between a premium consumer surface and a bordered panel, and it costs
  /// nothing but two `BoxShadow`s.
  static const card = [
    BoxShadow(
      color: Color(0x0D1F1A17),
      blurRadius: 22,
      spreadRadius: -10,
      offset: Offset(0, 8),
    ),
    BoxShadow(
      color: Color(0x081F1A17),
      blurRadius: 3,
      spreadRadius: -1,
      offset: Offset(0, 1),
    ),
  ];

  /// A card the customer has to act on, or the one live thing in a list.
  /// The same two layers, a third again as deep.
  static const cardRaised = [
    BoxShadow(
      color: Color(0x141F1A17),
      blurRadius: 30,
      spreadRadius: -12,
      offset: Offset(0, 10),
    ),
    BoxShadow(
      color: Color(0x0B1F1A17),
      blurRadius: 4,
      spreadRadius: -1,
      offset: Offset(0, 2),
    ),
  ];

  /// Controls that genuinely float over content — map buttons, map chips.
  static const float = [
    BoxShadow(
      color: Color(0x0D191716),
      blurRadius: 2,
      offset: Offset(0, 1),
    ),
  ];

  static const sheet = [
    BoxShadow(
      color: Color(0x2E191716),
      blurRadius: 40,
      spreadRadius: -20,
      offset: Offset(0, -8),
    ),
  ];

  // Aliases kept for existing call sites.
  static const two = float;
  static const three = sheet;
}

/// Clearance for the floating tab bar.
///
/// ── It was being counted twice ──
///
/// Every root padded its foot by `MediaQuery.paddingOf(context).bottom + 74`,
/// on the reasoning that the inset is the device's home indicator and 74 is
/// the bar floating over it. That is not what the body is handed. `Scaffold`
/// with `extendBody: true` **replaces** the body's bottom padding with the
/// laid-out height of the `bottomNavigationBar` — the bar's own SafeArea, its
/// 10 of padding and its 62 of pill, all of it. Measured: a 34pt device inset
/// and this bar gives the body `padding.bottom = 106`, which is the bar
/// exactly.
///
/// So the roots were clearing the bar, and then clearing it again. It cost 74
/// points of empty canvas under the last card on Home, Orders and Account —
/// enough that Home's caption had nowhere to go while a hole sat under the
/// form.
///
/// The inset is the clearance. [gap] is the air between the last card and the
/// top of the pill, which is a design decision rather than a measurement.
double dmTabBarClear(BuildContext context, {double gap = 12}) =>
    MediaQuery.paddingOf(context).bottom + gap;

class DmMotion {
  DmMotion._();
  static const fast = Duration(milliseconds: 140);
  static const base = Duration(milliseconds: 250);
  static const slow = Duration(milliseconds: 460);
  static const ease = Curves.easeOutCubic;

  /// The bottom nav's travelling pill — a touch of overshoot, which reads as
  /// the indicator catching up rather than teleporting.
  static const glide = Cubic(0.34, 1.06, 0.36, 1);

  /// Screen transitions. An emphasised decelerate: it leaves quickly and
  /// settles slowly, so a push feels driven at the start and arrived-at by the
  /// end. `easeOutCubic` is too even across a distance this short — it reads
  /// as a constant-speed slide.
  static const enter = Cubic(0.05, 0.7, 0.1, 1);
}

/// Poppins for voice, Geist Mono for data.
///
/// ── Why the sans styles look different from the mono ones ──
///
/// Poppins has no variable release. Google Fonts ships it as static cuts only,
/// so the sans styles below set `fontWeight` and nothing else: there is no
/// `wght` axis to move, and `fontVariations` on a static font is ignored in
/// silence, which is worse than useless — it reads as if it were doing the
/// work. `pubspec.yaml` declares one file per weight and Flutter matches on the
/// enum. Geist Mono is still variable and its three styles still carry the axis.
///
/// Only the four weights the design uses are bundled — 500, 600, 700, 800 —
/// because each one is a separate ~155 KB file. Asking for w900 anywhere would
/// not fail; Flutter would quietly synthesise it from Bold, and it would look
/// like it.
///
/// ── Every weight is one step lighter than it was ──
///
/// Poppins is a geometric face built on near-circles, and it carries far more
/// ink at the same nominal weight than the humanist faces before it. Styles
/// that were w900 are w800, w800 are w700, w700 are w600. Set at the old
/// numbers the headings looked inflated rather than strong.
///
/// ── And the tracking is deeper again ──
///
/// The opposite correction from the last face. Poppins is wide, round and has
/// generous default sidebearings, so display sizes need pulling in harder than
/// anything this app has used — the header runs at −1.2. Body sizes stay near
/// zero, because the same roundness is what makes it legible small and tracking
/// it in takes that back. Tracking belongs to a typeface, not to a design.
class DmText {
  DmText._();

  /// ── Switzer → Plus Jakarta Sans (2026-09-24) ──
  ///
  /// Both are variable neo-grotesques and the swap is a one-line change, but
  /// two things come with it. Plus Jakarta's humanist curves and taller
  /// x-height give the place names the editorial weight the reference design
  /// has, and — the practical part — **it carries the rupee glyph**, which
  /// Switzer does not. Every amount in this app was set in Geist Mono for that
  /// reason alone; the ones that are prices rather than data can now be type.
  ///
  /// Its axis is wght 200–800, so every weight the design uses is real rather
  /// than synthesised.
  static const _f = 'PlusJakartaSans';
  static const _mono = 'GeistMono';

  // The weight axis. Switzer and Geist Mono both ship as one variable file, so
  // a style has to move `wght` to change weight — `fontWeight` alone picks the
  // nearest named instance and, on a single-file VF, that is always the
  // default. Both are set on every style: the axis does the work, the enum
  // keeps the semantics (and the system-font fallback) correct.
  //
  // This came back when Poppins left. Poppins has no variable release, so for
  // one release the sans styles carried `fontWeight` alone and this block was
  // the mono's private business.
  static const _w500 = [FontVariation('wght', 500)];
  static const _w600 = [FontVariation('wght', 600)];
  static const _w700 = [FontVariation('wght', 700)];
  static const _w800 = [FontVariation('wght', 800)];

  // Letter spacing is quoted in em by the design and converted here at each
  // size, because -0.035em is a different number of pixels on a 31pt display
  // head than on a 15pt row title, and splitting the difference would soften
  // exactly the heads that are supposed to feel tight.

  // ── Display ──────────────────────────────────────────────────────────────

  /// Screen-dominating statement — "Pickup booked", "Arun is 12 minutes away".
  static const display = TextStyle(
    fontFamily: _f, fontSize: 31, height: 1.1,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -1.1, color: DmColors.ink,
  );

  /// The largest line on a screen: the name on Home, the title of a tab root.
  ///
  /// It was white, because it was written for a crimson header. That header is
  /// a canvas now and every caller was overriding the colour back to ink, so
  /// the white was a trap waiting for the first caller who did not.
  static const headerTitle = TextStyle(
    fontFamily: _f, fontSize: 34, height: 1.0,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -1.4, color: DmColors.ink,
  );

  /// Screen headings on a canvas.
  static const title = TextStyle(
    fontFamily: _f, fontSize: 25, height: 1.16,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -0.8, color: DmColors.ink,
  );

  /// Tab-root page titles where no brand header is used.
  static const pageTitle = title;

  /// The heading above a group of cards, and a sheet's own title.
  static const heading = TextStyle(
    fontFamily: _f, fontSize: 18, height: 1.25,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.45, color: DmColors.ink,
  );

  static const sheetTitle = TextStyle(
    fontFamily: _f, fontSize: 21, height: 1.2,
    fontWeight: FontWeight.w800, fontVariations: _w800,
    letterSpacing: -0.65, color: DmColors.ink,
  );

  // ── Rows ─────────────────────────────────────────────────────────────────

  /// A row's own line — `t1` in the design, and the workhorse of the app.
  static const cardTitle = TextStyle(
    fontFamily: _f, fontSize: 15, height: 1.4,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    letterSpacing: -0.2, color: DmColors.ink,
  );

  /// Alias: the same weight of statement, used mid-form.
  static const bodyStrong = cardTitle;

  static const body = TextStyle(
    fontFamily: _f, fontSize: 15, height: 1.5,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.12, color: DmColors.ink,
  );

  /// Supporting line under a row title — `t2`.
  static const small = TextStyle(
    fontFamily: _f, fontSize: 13.5, height: 1.45,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    color: DmColors.ink2,
  );

  /// The quietest line — `t3`. Timestamps, counts, "collected on".
  static const tiny = TextStyle(
    fontFamily: _f, fontSize: 13, height: 1.4,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    color: DmColors.ink3,
  );

  /// Paragraph under a screen heading.
  static const lede = TextStyle(
    fontFamily: _f, fontSize: 14.5, height: 1.55,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    color: DmColors.ink2,
  );

  /// The right-hand value in a settings row.
  static const value = TextStyle(
    fontFamily: _f, fontSize: 13.5, height: 1.4,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink2,
  );

  /// Field labels, tags, chips, inline actions.
  static const label = TextStyle(
    fontFamily: _f, fontSize: 12.5, height: 1.3,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink2,
  );

  static const button = TextStyle(
    fontFamily: _f, fontSize: 16, height: 1.2,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.25,
  );

  /// The text-only action under a primary button ("Back to home").
  static const textButton = TextStyle(
    fontFamily: _f, fontSize: 14.5, height: 1.2,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink2,
  );

  /// Uppercase micro-label above a group — the design's `micro`. Crimson when
  /// it heads brand content, [DmColors.ink3] when it heads a neutral group.
  static const eyebrow = TextStyle(
    fontFamily: _f, fontSize: 10.5, height: 1.3,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    letterSpacing: 1.16, color: DmColors.ink3,
  );

  /// The eyebrow as it appears on the crimson header.
  static const headerEyebrow = TextStyle(
    fontFamily: _f, fontSize: 11.5, height: 1.3,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: 1.84, color: DmColors.onBrand3,
  );

  /// Sentence-case heading above a group of rows.
  static const sectionHead = TextStyle(
    fontFamily: _f, fontSize: 15, height: 1.3,
    fontWeight: FontWeight.w700, fontVariations: _w700,
    letterSpacing: -0.3, color: DmColors.ink,
  );

  /// Alias kept for existing call sites.
  static const groupHead = sectionHead;

  /// Field input text.
  static const field = TextStyle(
    fontFamily: _f, fontSize: 16, height: 1.3,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink,
  );

  // ── Mono: anything checkable digit by digit ──────────────────────────────

  /// References, plates and phone numbers sitting inline in a row.
  static const mono = TextStyle(
    fontFamily: _mono, fontSize: 13, height: 1.4,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.26, color: DmColors.ink3,
  );

  /// Step counters, timers, the smallest data.
  static const monoSm = TextStyle(
    fontFamily: _mono, fontSize: 11.5, height: 1.3,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.23, color: DmColors.ink3,
  );

  /// A booking reference given its own line, or a fare.
  static const monoLg = TextStyle(
    fontFamily: _mono, fontSize: 19, height: 1.2,
    fontWeight: FontWeight.w500, fontVariations: _w500,
    letterSpacing: -0.38, color: DmColors.ink,
  );

  /// The OTP digits.
  static const otp = TextStyle(
    fontFamily: _f, fontSize: 24, height: 1.1,
    fontWeight: FontWeight.w600, fontVariations: _w600,
    color: DmColors.ink,
  );
}