App icon and a lavender Stretching palette

A lotus inside a dry-brush ensō, with a small plate in the gap and a small
barbell as the lifting hint. Drawn by tools/icon/make_icon.py and wired up
with flutter_launcher_icons; the launch screen uses the icon's lavender.
Stretching Mode moves from sage/teal to the icon's lavender and violet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

GLOSSARY.md

@@ -11,7 +11,7 @@ app: design, Exercise Library, Plans and History. The last-used Mode is remember
 _Avoid_: Tab, section, category
 
 **Stretching Mode**:
-The calm Mode: light design, sage/teal, rounded shapes, slow transitions.
+The calm Mode: light design, lavender and violet, rounded shapes, slow transitions.
 
 **Workout Mode**:
 The energetic Mode: dark design, orange/red on near-black, bold type, snappy transitions.

android/app/src/main/res/drawable-v21/launch_background.xml

@@ -1,12 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Modify this file to customize your launch splash screen -->
+<!-- The launch screen: the app icon's lavender mist, until Flutter draws its first frame. -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="?android:colorBackground" />
-
-    <!-- You can insert your own image assets here -->
-    <!-- <item>
-        <bitmap
-            android:gravity="center"
-            android:src="@mipmap/launch_image" />
-    </item> -->
+    <item android:drawable="@color/launch_background" />
 </layer-list>

android/app/src/main/res/drawable/launch_background.xml

@@ -1,12 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Modify this file to customize your launch splash screen -->
+<!-- The launch screen: the app icon's lavender mist, until Flutter draws its first frame. -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@android:color/white" />
-
-    <!-- You can insert your own image assets here -->
-    <!-- <item>
-        <bitmap
-            android:gravity="center"
-            android:src="@mipmap/launch_image" />
-    </item> -->
+    <item android:drawable="@color/launch_background" />
 </layer-list>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@color/ic_launcher_background"/>
+  <foreground>
+      <inset
+          android:drawable="@drawable/ic_launcher_foreground"
+          android:inset="16%" />
+  </foreground>
+</adaptive-icon>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="launch_background">#F1EEF6</color>
+	<color name="ic_launcher_background">#F1EEF6</color>
+</resources>

docs/adr/0002-library-ui-and-player.md

@@ -13,7 +13,7 @@ Status: Accepted (2026-10-28)
    Stretching = hold, both-sides flag, rounds. Workout Steps can be grouped into Supersets.
 5. **Library browsing**: search + muscle/equipment/level filters, reused as the Plan exercise picker.
 6. **Structure & design**: Mode switch at top; per-mode tabs Plans · Library · History.
-   Stretching = calm/light (sage/teal, rounded, slow). Workout = dark/energetic (orange/red, bold, snappy).
+   Stretching = calm/light (lavender/violet since ADR 0007, first sage/teal; rounded, slow). Workout = dark/energetic (orange/red, bold, snappy).
    Last-used mode is remembered.
 7. **Player cues**: Visual cues (countdown ring, accent pulse, next cards, auto-advance, screen kept on)
    plus a gentle, non-annoying sound. No vibration.

docs/adr/0007-app-icon.md

@@ -0,0 +1,23 @@
+# ADR 0007 — App icon: a lotus in a Zen circle, with a hint of lifting
+
+Status: Accepted (2026-10-29)
+
+1. **Motif**: a lotus inside an ensō (Zen brush circle). Yoga and calm lead; lifting is only a hint:
+   a small weight plate floating in the circle's open gap, and a small barbell under the lotus.
+2. **Brush**: the ensō is painted counter-clockwise from the top, with its gap at the upper right.
+   It starts round and solid with calm, nearly smooth edges, then runs dry: pale streaks open inside
+   the stroke and the bristles give out at different points, so the tail frays out close to the plate.
+   The circle is never closed.
+3. **Colours**: a calm purple palette: lavender mist ground `#F1EEF6`, muted violet `#6B5B95` for the
+   ensō and the lotus's centre petal, light violet `#A496C8` for the side petals, and a soft apricot
+   `#E98A6F` only for the plate and the barbell.
+4. **Stretching follows the icon**: Stretching Mode's palette moved from sage/teal to the same lavender
+   and violet, so the app and its icon match. Workout keeps its dark ember design.
+5. **Style**: flat shapes, no text, no gradients or outlines.
+6. **Format**: Android adaptive icon (foreground on a solid lavender background, masked by the launcher)
+   plus a legacy square PNG, wired up with `flutter_launcher_icons` as in CookIT.
+7. **Launch screen**: the Android launch background uses the same lavender mist as the icon.
+
+The icon is generated by `tools/icon/make_icon.py` (seeded, so it redraws identically): run it, then
+`dart run flutter_launcher_icons`. Rejected along the way: a dumbbell or barbell as the main element,
+a plate closing the circle's gap, a seated figure, and heavier, more textured brush strokes.

lib/src/design/zen_style.dart

@@ -74,16 +74,17 @@ class ZenStyle extends ThemeExtension<ZenStyle> {
   static const stretching = ZenStyle(
     mode: Mode.stretching,
     brightness: Brightness.light,
-    background: Color(0xFFEDF3EF),
+    // Lavender mist and a muted violet, as in the app icon.
+    background: Color(0xFFF1EEF6),
     surface: Color(0xFFFFFFFF),
-    surfaceSoft: Color(0xFFDCEAE2),
-    ink: Color(0xFF1E3832),
-    inkMuted: Color(0xFF587069),
-    accent: Color(0xFF2E8B80),
-    accentEnd: Color(0xFF2E8B80),
+    surfaceSoft: Color(0xFFE4DEEF),
+    ink: Color(0xFF2A2338),
+    inkMuted: Color(0xFF6A6279),
+    accent: Color(0xFF6B5B95),
+    accentEnd: Color(0xFF6B5B95),
     onAccent: Color(0xFFFFFFFF),
-    line: Color(0xFFA8C9B4),
-    navBar: Color(0xFFD3E5DA),
+    line: Color(0xFFC3B8DA),
+    navBar: Color(0xFFE0D9EC),
     radius: 28,
     controlRadius: 999,
     motion: Duration(milliseconds: 700),

pubspec.lock

@@ -17,6 +17,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "8.1.1"
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      sha256: "0d58d1fa1fddf6588251ccf2819f3fb3b6d0452c1b2813ac7413a05592bfbefe"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.5.2"
   args:
     dependency: transitive
     description:
@@ -294,6 +302,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_launcher_icons:
+    dependency: "direct dev"
+    description:
+      name: flutter_launcher_icons
+      sha256: "10f13781741a2e3972126fae08393d3c4e01fa4cd7473326b94b72cf594195e7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.14.4"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -397,6 +413,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.2"
+  image:
+    dependency: transitive
+    description:
+      name: image
+      sha256: "89ed75b2f8231fe676808c5564f9590d728024ded7ac782a7ed8474f1c95b72a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.12.0"
   intl:
     dependency: "direct main"
     description:
@@ -613,6 +637,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.5.3"
+  posix:
+    dependency: transitive
+    description:
+      name: posix
+      sha256: "613646d076944f3acc125830af935b48d4b8a57a388691547bbfd25b434f4d63"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.5.4"
   provider:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -31,6 +31,7 @@ dev_dependencies:
   drift_dev: ^2.31.0
   build_runner: ^2.15.1
   sqlite3: ^2.9.4
+  flutter_launcher_icons: ^0.14.4
 
 flutter:
   uses-material-design: true
@@ -84,3 +85,12 @@ flutter:
           weight: 600
         - asset: assets/fonts/Barlow-Bold.ttf
           weight: 700
+
+# Drawn by tools/icon/make_icon.py; regenerate with `dart run flutter_launcher_icons`.
+flutter_launcher_icons:
+  android: true
+  ios: false
+  image_path: assets/icon/icon.png
+  adaptive_icon_background: "#F1EEF6"
+  adaptive_icon_foreground: assets/icon/icon_foreground.png
+  min_sdk_android: 21

tools/icon/make_icon.py

@@ -0,0 +1,236 @@
+"""Draws the ZenXercise app icon: a lotus inside a dry-brush ensō, with a hint of lifting.
+
+Usage: python make_icon.py [output folder]   (default: assets/icon)
+
+Writes icon.png (legacy square icon on the lavender ground) and icon_foreground.png
+(transparent adaptive-icon foreground, kept inside the launcher's safe zone).
+Everything is drawn at 4x and scaled down, which smooths the edges. All randomness is
+seeded, so the icon is identical on every run.
+"""
+
+from __future__ import annotations
+
+import math
+import random
+import sys
+from pathlib import Path
+
+from PIL import Image, ImageDraw
+
+SIZE = 1024
+SCALE = 4
+# Stretching's palette.
+GROUND = (241, 238, 246, 255)  # Lavender mist: the icon's background and the launch screen
+VIOLET = (107, 91, 149, 255)  # The ensō and the lotus's centre petal
+VIOLET_LIGHT = (164, 150, 200, 255)  # Side petals: a tonal step of the violet
+APRICOT = (233, 138, 111, 255)  # The lifting hint only: the plate and the small barbell
+
+
+def _s(v: float) -> float:
+    return v * SCALE
+
+
+class _Noise:
+    """Smooth 1-D value noise in -1..1."""
+
+    def __init__(self, seed: int, size: int = 512):
+        rng = random.Random(seed)
+        self.values = [rng.uniform(-1, 1) for _ in range(size)]
+
+    def __call__(self, x: float) -> float:
+        i = math.floor(x)
+        f = x - i
+        a = self.values[i % len(self.values)]
+        b = self.values[(i + 1) % len(self.values)]
+        return a + (b - a) * (1 - math.cos(math.pi * f)) / 2
+
+
+def dry_brush_enso(
+    draw: ImageDraw.ImageDraw, cx: float, cy: float, r: float, width: float, gap_deg: float, gap_at: float
+):
+    """An ensō painted counter-clockwise from beside the gap.
+
+    The opening of [gap_deg] degrees is centred on [gap_at] (degrees, 0 = right, counter-clockwise).
+    The brush lands with a round start and calm, nearly smooth edges; from halfway it runs dry:
+    its bristles stop overlapping, so pale streaks open inside the stroke, and the bristles give
+    out at different points, fraying the tail.
+    """
+    serration, nicks, swell, wander = _Noise(3), _Noise(29), _Noise(11), _Noise(19)
+    rng = random.Random(13)
+    start = math.radians(gap_at + gap_deg / 2)
+    sweep = math.radians(360 - gap_deg)
+    dry = 0.5  # Where the brush starts to run out of ink.
+
+    def angle(t: float) -> float:
+        return start + sweep * t
+
+    def centre(t: float) -> float:
+        return r * (1 + 0.01 * wander(t * 3))
+
+    def stroke_width(t: float) -> float:
+        return width * (0.93 + 0.1 * swell(t * 3.5)) * (1 - 0.28 * (max(0.0, t - dry) / (1 - dry)) ** 1.6)
+
+    def point(t: float, d: float) -> tuple[float, float]:
+        a = angle(t)
+        return (_s(cx + d * math.cos(a)), _s(cy - d * math.sin(a)))
+
+    def ragged(t: float, side: int) -> float:
+        """A faint irregularity on both edges, and the rare small nick on the outside."""
+        fine = 0.006 * serration(t * 40 + side * 31) + 0.002 * serration(t * 120 + side * 77)
+        nick = max(0.0, nicks(t * 9 + side * 5) - 0.8) * (0.03 if side > 0 else 0.0)
+        return (fine - nick) * min(1.0, t / 0.08)
+
+    steps = 1400
+    # Solid body, overlapping the bristles where they take over, with a round start.
+    ts = [i * (dry + 0.06) / steps for i in range(steps + 1)]
+    outer = [point(t, centre(t) + stroke_width(t) * (0.5 + ragged(t, 1))) for t in ts]
+    inner = [point(t, centre(t) - stroke_width(t) * (0.5 + ragged(t, -1))) for t in ts]
+    draw.polygon(outer + inner[::-1], fill=VIOLET)
+    a0, w0, d0 = angle(0.0), stroke_width(0.0), centre(0.0)
+    x0, y0 = cx + d0 * math.cos(a0), cy - d0 * math.sin(a0)
+    draw.ellipse([_s(x0 - w0 / 2), _s(y0 - w0 / 2), _s(x0 + w0 / 2), _s(y0 + w0 / 2)], fill=VIOLET)
+
+    # Bristles from the dry point on.
+    count = 15
+    for k in range(count):
+        frac = -0.5 + (k + 0.5) / count
+        edge = abs(frac) * 2
+        ink = rng.random()
+        end = 0.95 - 0.05 * rng.random() - 0.16 * edge**1.6  # Edge bristles give out sooner.
+        skips = []
+        for _ in range(rng.randint(0, 2)):
+            s0 = dry + 0.22 + rng.random() * max(0.0, end - dry - 0.3)
+            skips.append((s0, s0 + 0.008 + rng.random() * 0.025 * (1.2 - ink)))
+        phase = rng.random() * math.tau
+
+        def edges(t: float) -> tuple[float, float]:
+            w = stroke_width(t)
+            dried = max(0.0, (t - dry) / (end - dry))
+            # Full overlap while inked; separating as the bristle dries out.
+            half = 0.5 / count * (1.8 - 1.25 * dried ** (0.7 + ink)) * max(0.0, min(1.0, (end - t) / 0.12)) ** 0.8
+            # Lifting off the paper and touching down again: taper into and out of each skip.
+            for a, b in skips:
+                near = max(a - t, t - b, 0.0)
+                half *= min(1.0, near / 0.018) ** 0.7
+            splay = w * 0.005 * dried * math.sin(2 * math.pi * 6 * t + phase)
+            mid = centre(t) + w * frac + splay
+            # Never past the stroke's own edges, so the body hands over without a step.
+            top = min(mid + w * half, centre(t) + w * (0.5 + ragged(t, 1)))
+            bottom = max(mid - w * half, centre(t) - w * (0.5 + ragged(t, -1)))
+            return top, min(bottom, top)
+
+        run: list[float] = []
+
+        def flush():
+            if len(run) > 1:
+                draw.polygon([point(t, edges(t)[0]) for t in run] + [point(t, edges(t)[1]) for t in reversed(run)], fill=VIOLET)
+            run.clear()
+
+        for i in range(steps + 1):
+            t = dry + (end - dry) * i / steps
+            if any(a <= t <= b for a, b in skips):
+                flush()
+            else:
+                run.append(t)
+        flush()
+
+
+def plate(draw: ImageDraw.ImageDraw, cx: float, cy: float, r: float, ground):
+    """A weight plate seen from the front: a disc with a centre hole."""
+    draw.ellipse([_s(cx - r), _s(cy - r), _s(cx + r), _s(cy + r)], fill=APRICOT)
+    hole = r * 0.3
+    draw.ellipse([_s(cx - hole), _s(cy - hole), _s(cx + hole), _s(cy + hole)], fill=ground)
+
+
+class Pen:
+    """Draws in 1024-unit coordinates around the centre, shrunk by [scale]."""
+
+    def __init__(self, draw: ImageDraw.ImageDraw, scale: float):
+        self.draw = draw
+        self.scale = scale
+
+    def p(self, x: float, y: float) -> tuple[float, float]:
+        c = SIZE / 2
+        return (_s(c + (x - c) * self.scale), _s(c + (y - c) * self.scale))
+
+    def w(self, v: float) -> float:
+        return _s(v * self.scale)
+
+    def circle(self, x, y, r, fill):
+        cx, cy = self.p(x, y)
+        rr = self.w(r)
+        self.draw.ellipse([cx - rr, cy - rr, cx + rr, cy + rr], fill=fill)
+
+    def limb(self, points, width, fill):
+        """A thick stroke through [points] with round ends and joints."""
+        pts = [self.p(x, y) for x, y in points]
+        self.draw.line(pts, fill=fill, width=int(self.w(width)), joint="curve")
+        for x, y in points:
+            self.circle(x, y, width / 2, fill)
+
+    def bar(self, x0, x1, y, thickness, fill, plates=1.0):
+        """A horizontal barbell: the bar, a big and a small plate at each end, sized by [plates]."""
+        self.limb([(x0, y), (x1, y)], thickness, fill)
+        for side, end in ((-1, x0), (1, x1)):
+            for offset, w, h in ((-28 * plates, 34 * plates, 120 * plates), (4 * plates, 24 * plates, 84 * plates)):
+                px = end - side * offset
+                a, b = self.p(px - w / 2, y - h / 2)
+                c, d = self.p(px + w / 2, y + h / 2)
+                self.draw.rounded_rectangle([a, b, c, d], radius=self.w(w / 2.4), fill=fill)
+
+    def petal(self, bx, by, length, width, angle_deg, fill):
+        """An almond-shaped petal growing from (bx, by) towards [angle_deg] (90 = up)."""
+        a = math.radians(angle_deg)
+        ux, uy = math.cos(a), -math.sin(a)
+        nx, ny = -uy, ux
+        left, right = [], []
+        steps = 80
+        for i in range(steps + 1):
+            t = i / steps
+            half = width / 2 * math.sin(math.pi * t) ** 0.75 * (1 - 0.25 * t)
+            x, y = bx + ux * length * t, by + uy * length * t
+            left.append(self.p(x + nx * half, y + ny * half))
+            right.append(self.p(x - nx * half, y - ny * half))
+        self.draw.polygon(left + right[::-1], fill=fill)
+
+
+def lotus(pen: Pen, base: float) -> None:
+    """Five petals growing from (512, [base]): a deep centre, lighter sides."""
+    for angle, length, width, fill in (
+        (162, 250, 150, VIOLET_LIGHT),
+        (18, 250, 150, VIOLET_LIGHT),
+        (128, 300, 160, VIOLET_LIGHT),
+        (52, 300, 160, VIOLET_LIGHT),
+        (90, 360, 190, VIOLET),
+    ):
+        pen.petal(512, base, length, width, angle, fill)
+
+
+def draw_icon(ground, scale: float) -> Image.Image:
+    """The motif on [ground]; [scale] shrinks it to fit the adaptive safe zone."""
+    image = Image.new("RGBA", (SIZE * SCALE, SIZE * SCALE), ground)
+    draw = ImageDraw.Draw(image)
+    c = SIZE / 2
+    r = 300 * scale
+    plate_at = 58  # Upper right, in the ensō's open gap.
+    # The stroke starts 29° past the plate and runs on until its dry tail gives out close to it.
+    dry_brush_enso(draw, c, c, r, 74 * scale, gap_deg=44, gap_at=plate_at + 7)
+    lotus(Pen(draw, scale * 0.7), base=660)
+    Pen(draw, scale * 0.7).bar(382, 642, 730, 16, APRICOT, plates=0.5)
+    a = math.radians(plate_at)
+    plate(draw, c + r * math.cos(a), c - r * math.sin(a), 46 * scale, ground)
+    return image.resize((SIZE, SIZE), Image.LANCZOS)
+
+
+def main() -> None:
+    out = Path(sys.argv[1]) if len(sys.argv) > 1 else Path(__file__).resolve().parents[2] / "assets" / "icon"
+    out.mkdir(parents=True, exist_ok=True)
+    # Legacy icon: full bleed on the lavender ground.
+    draw_icon(GROUND, 1.0).save(out / "icon.png")
+    # Adaptive foreground: transparent, shrunk into the central safe zone (about 61% of the canvas).
+    draw_icon((0, 0, 0, 0), 0.68).save(out / "icon_foreground.png")
+    print(f"icon -> {out}")
+
+
+if __name__ == "__main__":
+    main()