From e49990776b744cf23572e77ca5a98e5af13bbb0c Mon Sep 17 00:00:00 2001
From: JustMe <mr.toing@outlook.com>
Date: Fri, 9 Oct 2026 03:54:49 +0800
Subject: [PATCH] feat(display): falling snow in three depth layers with wind,
 mouse and bullet time; appearance panel; dark glass tinted from the
 background [CI SKIP]

---
 web/display/src/App.tsx             |   9 +
 web/display/src/AppearancePanel.tsx | 130 +++++++++++++
 web/display/src/appearance.ts       | 109 +++++++++++
 web/display/src/backgroundTint.ts   |  81 ++++++++
 web/display/src/display.css         | 275 +++++++++++++++++++++++++++
 web/display/src/parallax.ts         |  14 +-
 web/display/src/weather/Weather.tsx |  10 +
 web/display/src/weather/engine.ts   | 277 ++++++++++++++++++++++++++++
 web/display/src/weather/presets.ts  |  93 ++++++++++
 web/shared/theme/tokens.css         |  12 +-
 10 files changed, 1003 insertions(+), 7 deletions(-)
 create mode 100644 web/display/src/AppearancePanel.tsx
 create mode 100644 web/display/src/appearance.ts
 create mode 100644 web/display/src/backgroundTint.ts
 create mode 100644 web/display/src/weather/Weather.tsx
 create mode 100644 web/display/src/weather/engine.ts
 create mode 100644 web/display/src/weather/presets.ts

diff --git a/web/display/src/App.tsx b/web/display/src/App.tsx
index e946799..86a6cf4 100644
--- a/web/display/src/App.tsx
+++ b/web/display/src/App.tsx
@@ -6,7 +6,12 @@ import { SourceButton, ThemeToggle } from '@shared/ui'
 import { Compare } from './pages/Compare'
 import { Line } from './pages/Line'
 import { Overview } from './pages/Overview'
+import { useBackgroundTint } from './backgroundTint'
 import { useBackgroundParallax } from './parallax'
+import { Weather } from './weather/Weather'
+import { AppearancePanel } from './AppearancePanel'
+import { useAppearanceVars } from './appearance'
+import { snow } from './weather/presets'
 
 function LineRoute() {
   const { id } = useParams()
@@ -16,12 +21,15 @@ function LineRoute() {
 export function App() {
   const background = useRef<HTMLDivElement>(null)
   useBackgroundParallax(background)
+  useBackgroundTint()
+  useAppearanceVars()
   const location = useLocation()
   const ipv6 = location.pathname.endsWith('~ipv6') || new URLSearchParams(location.search).get('ip_version') === 'ipv6'
   const familyQuery = ipv6 ? '?ip_version=ipv6' : ''
   return (
     <>
       <div ref={background} className="bg-layer" aria-hidden="true" />
+      <Weather preset={snow} />
       <header className="topbar">
         <div className="inner">
           <NavLink to={`/${familyQuery}`} className="brand">
@@ -46,6 +54,7 @@ export function App() {
         <Route path="/compare" element={<Compare />} />
         <Route path="*" element={<Navigate to="/" replace />} />
       </Routes>
+      <AppearancePanel />
       <footer className="site-foot">
         国家和运营商由 <a href="https://ip.007995.xyz/" target="_blank" rel="noreferrer">ip.007995.xyz</a> 查询
         <BuildFooter />
diff --git a/web/display/src/AppearancePanel.tsx b/web/display/src/AppearancePanel.tsx
new file mode 100644
index 0000000..d944bb1
--- /dev/null
+++ b/web/display/src/AppearancePanel.tsx
@@ -0,0 +1,130 @@
+import { useEffect, useRef, useState } from 'react'
+import { APPEARANCE_DEFAULTS, APPEARANCE_RANGES, resetAppearance, setAppearance, useAppearance, type AppearanceSettings } from './appearance'
+
+type Tab = 'weather' | 'background'
+
+type SliderName = keyof typeof APPEARANCE_RANGES
+
+interface Slider {
+  name: SliderName
+  label: string
+  /** 数值怎么显示：默认是百分比。 */
+  format?: (value: number) => string
+}
+
+const percent = (value: number) => `${Math.round(value * 100)}%`
+
+const WEATHER_SLIDERS: Slider[] = [
+  { name: 'density', label: '数量' },
+  { name: 'speed', label: '速度' },
+  { name: 'wind', label: '风力' },
+  { name: 'size', label: '大小' },
+  { name: 'blur', label: '虚化' },
+  { name: 'opacity', label: '透明度' },
+]
+
+const WEATHER_SWITCHES: { name: 'mouse' | 'bullet'; label: string; hint: string }[] = [
+  { name: 'mouse', label: '鼠标拨动', hint: '鼠标经过时把雪推开、带起风' },
+  { name: 'bullet', label: '子弹时间', hint: '鼠标停住时，周围的雪慢下来' },
+]
+
+const BACKGROUND_SLIDERS: Slider[] = [
+  { name: 'bgBlur', label: '模糊', format: (value) => `${value}px` },
+  { name: 'parallax', label: '晃动' },
+]
+
+const WEATHER_KEYS: (keyof AppearanceSettings)[] = ['enabled', 'density', 'speed', 'wind', 'size', 'blur', 'opacity', 'bullet', 'mouse']
+const BACKGROUND_KEYS: (keyof AppearanceSettings)[] = ['bgBlur', 'parallax']
+
+function SliderRow({ slider, settings, disabled }: { slider: Slider; settings: AppearanceSettings; disabled?: boolean }) {
+  const { name, label, format = percent } = slider
+  return (
+    <label className="appearance-row">
+      <span>{label}</span>
+      <input type="range" {...APPEARANCE_RANGES[name]} value={settings[name]} disabled={disabled} onChange={(event) => setAppearance({ [name]: Number(event.target.value) })} />
+      <output>{format(settings[name])}</output>
+    </label>
+  )
+}
+
+function SwitchRow({ label, hint, checked, disabled, onChange, master }: { label: string; hint?: string; checked: boolean; disabled?: boolean; onChange: (checked: boolean) => void; master?: boolean }) {
+  return (
+    <label className={`appearance-row appearance-row-switch${master ? ' appearance-master' : ''}`} title={hint}>
+      <span>{label}</span>
+      <span className="appearance-switch">
+        <input type="checkbox" checked={checked} disabled={disabled} onChange={(event) => onChange(event.target.checked)} />
+        <span />
+      </span>
+    </label>
+  )
+}
+
+/**
+ * 右下角的「外观」：一个小按钮，点开是分类的设置面板，改动立刻生效并记在浏览器里。
+ * 分类：「下雪」（雪的数量、速度、风力等）和「背景」（背景的额外模糊、跟着鼠标晃动的幅度）。
+ */
+export function AppearancePanel() {
+  const settings = useAppearance()
+  const [open, setOpen] = useState(false)
+  const [tab, setTab] = useState<Tab>('weather')
+  const root = useRef<HTMLDivElement>(null)
+
+  useEffect(() => {
+    if (!open) return
+    const outside = (event: PointerEvent) => {
+      if (root.current && !root.current.contains(event.target as Node)) setOpen(false)
+    }
+    const escape = (event: KeyboardEvent) => {
+      if (event.key === 'Escape') setOpen(false)
+    }
+    document.addEventListener('pointerdown', outside)
+    document.addEventListener('keydown', escape)
+    return () => {
+      document.removeEventListener('pointerdown', outside)
+      document.removeEventListener('keydown', escape)
+    }
+  }, [open])
+
+  const keys = tab === 'weather' ? WEATHER_KEYS : BACKGROUND_KEYS
+  const changed = keys.some((name) => settings[name] !== APPEARANCE_DEFAULTS[name])
+
+  return (
+    <div ref={root} className="appearance">
+      <div className="appearance-panel" data-open={open} role="dialog" aria-label="外观设置" aria-hidden={!open}>
+        <div className="appearance-tabs" data-tab={tab} role="tablist">
+          <button type="button" role="tab" aria-selected={tab === 'weather'} tabIndex={open ? 0 : -1} onClick={() => setTab('weather')}>
+            下雪
+          </button>
+          <button type="button" role="tab" aria-selected={tab === 'background'} tabIndex={open ? 0 : -1} onClick={() => setTab('background')}>
+            背景
+          </button>
+        </div>
+        {tab === 'weather' ? (
+          <div className="appearance-body" key="weather" data-off={!settings.enabled}>
+            <SwitchRow master label="下雪" checked={settings.enabled} onChange={(enabled) => setAppearance({ enabled })} />
+            {WEATHER_SLIDERS.map((slider) => (
+              <SliderRow key={slider.name} slider={slider} settings={settings} disabled={!settings.enabled} />
+            ))}
+            {WEATHER_SWITCHES.map(({ name, label, hint }) => (
+              <SwitchRow key={name} label={label} hint={hint} checked={settings[name]} disabled={!settings.enabled} onChange={(checked) => setAppearance({ [name]: checked })} />
+            ))}
+          </div>
+        ) : (
+          <div className="appearance-body" key="background">
+            {BACKGROUND_SLIDERS.map((slider) => (
+              <SliderRow key={slider.name} slider={slider} settings={settings} />
+            ))}
+          </div>
+        )}
+        <button type="button" className="appearance-reset" disabled={!changed} tabIndex={open ? 0 : -1} onClick={() => resetAppearance(keys)}>
+          恢复默认
+        </button>
+      </div>
+      <button type="button" className="appearance-fab" aria-label="外观设置" aria-expanded={open} title="外观设置" onClick={() => setOpen(!open)}>
+        <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" aria-hidden="true">
+          <path d="M12 2v20M3.3 7l17.4 10M3.3 17L20.7 7M9 3.8l3 2.4 3-2.4M9 20.2l3-2.4 3 2.4" />
+        </svg>
+      </button>
+    </div>
+  )
+}
diff --git a/web/display/src/appearance.ts b/web/display/src/appearance.ts
new file mode 100644
index 0000000..a557c32
--- /dev/null
+++ b/web/display/src/appearance.ts
@@ -0,0 +1,109 @@
+import { useEffect, useSyncExternalStore } from 'react'
+
+/**
+ * 展示页右下角「外观」里能调的参数：都是相对默认值的倍数（1 = 原样），存在浏览器里。
+ * 分两类：天气（雪，见 weather/）和背景（模糊、跟着鼠标晃动）。
+ */
+export interface AppearanceSettings {
+  /** 下雪的总开关。 */
+  enabled: boolean
+  /** 数量。 */
+  density: number
+  /** 下落速度。 */
+  speed: number
+  /** 风力（风的大小和鼠标带起的风）。 */
+  wind: number
+  /** 粒子大小。 */
+  size: number
+  /** 虚化程度（1 是预设原样，小于 1 更清晰，大于 1 更糊）。 */
+  blur: number
+  /** 透明度。 */
+  opacity: number
+  /** 子弹时间（鼠标停住时周围变慢）。 */
+  bullet: boolean
+  /** 鼠标拨动雪。 */
+  mouse: boolean
+  /** 背景在预先模糊的基础上再模糊多少（像素，0 是不再模糊）。 */
+  bgBlur: number
+  /** 背景跟着鼠标晃动的幅度（0 是不动，1 是默认）。 */
+  parallax: number
+}
+
+export const APPEARANCE_DEFAULTS: AppearanceSettings = {
+  enabled: true,
+  density: 1,
+  speed: 1,
+  wind: 1,
+  size: 1,
+  blur: 1,
+  opacity: 1,
+  bullet: true,
+  mouse: true,
+  bgBlur: 0,
+  parallax: 1,
+}
+
+/** 每个滑块的范围（和 AppearanceSettings 里同名的数值项对应）。 */
+export const APPEARANCE_RANGES = {
+  density: { min: 0.2, max: 3, step: 0.05 },
+  speed: { min: 0.3, max: 3, step: 0.05 },
+  wind: { min: 0, max: 3, step: 0.05 },
+  size: { min: 0.5, max: 2.5, step: 0.05 },
+  blur: { min: 0, max: 2, step: 0.05 },
+  opacity: { min: 0.2, max: 2.5, step: 0.05 },
+  bgBlur: { min: 0, max: 30, step: 1 },
+  parallax: { min: 0, max: 1.5, step: 0.05 },
+} as const
+
+const KEY = 'moshiro.appearance'
+const listeners = new Set<() => void>()
+
+function load(): AppearanceSettings {
+  try {
+    const saved = JSON.parse(localStorage.getItem(KEY) ?? '{}') as Partial<AppearanceSettings>
+    const merged: Record<string, unknown> = { ...APPEARANCE_DEFAULTS }
+    for (const name of Object.keys(APPEARANCE_DEFAULTS) as (keyof AppearanceSettings)[]) {
+      const value = saved[name]
+      if (typeof value === typeof APPEARANCE_DEFAULTS[name]) merged[name] = value
+    }
+    return merged as unknown as AppearanceSettings
+  } catch {
+    return { ...APPEARANCE_DEFAULTS }
+  }
+}
+
+let current = load()
+
+export const getAppearance = () => current
+
+export function setAppearance(patch: Partial<AppearanceSettings>) {
+  current = { ...current, ...patch }
+  try {
+    localStorage.setItem(KEY, JSON.stringify(current))
+  } catch {
+    // 存不了（隐私模式等）就只在这次打开期间有效
+  }
+  listeners.forEach((listener) => listener())
+}
+
+export const resetAppearance = (keys: (keyof AppearanceSettings)[]) =>
+  setAppearance(Object.fromEntries(keys.map((name) => [name, APPEARANCE_DEFAULTS[name]])) as Partial<AppearanceSettings>)
+
+export function subscribeAppearance(listener: () => void): () => void {
+  listeners.add(listener)
+  return () => listeners.delete(listener)
+}
+
+export const useAppearance = () => useSyncExternalStore(subscribeAppearance, getAppearance)
+
+/** 把背景的额外模糊写进 <html> 的 --bg-filter（display.css 里 .bg-layer 用它；不模糊的时候是 none，不给浏览器多一层滤镜）。 */
+export function useAppearanceVars() {
+  useEffect(() => {
+    const apply = () => {
+      const blur = getAppearance().bgBlur
+      document.documentElement.style.setProperty('--bg-filter', blur > 0 ? `blur(${blur}px)` : 'none')
+    }
+    apply()
+    return subscribeAppearance(apply)
+  }, [])
+}
diff --git a/web/display/src/backgroundTint.ts b/web/display/src/backgroundTint.ts
new file mode 100644
index 0000000..af034b7
--- /dev/null
+++ b/web/display/src/backgroundTint.ts
@@ -0,0 +1,81 @@
+import { useEffect } from 'react'
+import bgLight from './assets/bg.jpg'
+import bgDark from './assets/bg-dark.jpg'
+
+/** 取样的缩略图大小：背景本来就是预先模糊过的，缩得很小就够算平均色。 */
+const SAMPLE_WIDTH = 32
+const SAMPLE_HEIGHT = 18
+
+/** 一张图的平均颜色（0–255 的 r、g、b），按每个像素的亮度加权过轻：太亮的高光（衣服、头发的亮部）不要把整体拉亮。 */
+function averageColor(image: HTMLImageElement): [number, number, number] | null {
+  const canvas = document.createElement('canvas')
+  canvas.width = SAMPLE_WIDTH
+  canvas.height = SAMPLE_HEIGHT
+  const context = canvas.getContext('2d', { willReadFrequently: true })
+  if (!context) return null
+  context.drawImage(image, 0, 0, SAMPLE_WIDTH, SAMPLE_HEIGHT)
+  const { data } = context.getImageData(0, 0, SAMPLE_WIDTH, SAMPLE_HEIGHT)
+  let r = 0
+  let g = 0
+  let b = 0
+  let weight = 0
+  for (let i = 0; i < data.length; i += 4) {
+    const luma = (data[i] * 0.299 + data[i + 1] * 0.587 + data[i + 2] * 0.114) / 255
+    const w = 1 - 0.6 * luma
+    r += data[i] * w
+    g += data[i + 1] * w
+    b += data[i + 2] * w
+    weight += w
+  }
+  return weight > 0 ? [r / weight, g / weight, b / weight] : null
+}
+
+/** rgb（0–255）转 hsl（h 0–360，s、l 0–1）。 */
+function toHsl(r: number, g: number, b: number): [number, number, number] {
+  const red = r / 255
+  const green = g / 255
+  const blue = b / 255
+  const max = Math.max(red, green, blue)
+  const min = Math.min(red, green, blue)
+  const l = (max + min) / 2
+  if (max === min) return [0, 0, l]
+  const d = max - min
+  const s = l > 0.5 ? d / (2 - max - min) : d / (max + min)
+  const h = max === red ? (green - blue) / d + (green < blue ? 6 : 0) : max === green ? (blue - red) / d + 2 : (red - green) / d + 4
+  return [h * 60, s, l]
+}
+
+/**
+ * 暗色下玻璃的颜色，和盖在背景图上的底色，都从当前背景图自己的平均色算出来：
+ * 色相照搬图里的，饱和度打个折（免得发艳、发蓝），亮度压到很暗。写进 <html> 的 --bg-tint（玻璃）和 --bg-veil-tint（底色），
+ * tokens.css 里暗色的 --glass-tint / --glass-veil 用它们；切换主题时重新取。亮色不用这个。
+ */
+export function useBackgroundTint() {
+  useEffect(() => {
+    const root = document.documentElement
+    const images = new Map<string, HTMLImageElement>()
+    const apply = (url: string) => {
+      const image = images.get(url)
+      const average = image && averageColor(image)
+      if (!average) return
+      const [h, s] = toHsl(...average)
+      root.style.setProperty('--bg-tint', `hsl(${h.toFixed(0)} ${(s * 55).toFixed(0)}% 13%)`)
+      root.style.setProperty('--bg-veil-tint', `hsl(${h.toFixed(0)} ${(s * 45).toFixed(0)}% 8%)`)
+    }
+    const update = () => {
+      const url = root.dataset.theme === 'dark' ? bgDark : bgLight
+      if (images.has(url)) {
+        apply(url)
+        return
+      }
+      const image = new Image()
+      images.set(url, image)
+      image.onload = () => apply(url)
+      image.src = url
+    }
+    update()
+    const observer = new MutationObserver(update)
+    observer.observe(root, { attributes: true, attributeFilter: ['data-theme'] })
+    return () => observer.disconnect()
+  }, [])
+}
diff --git a/web/display/src/display.css b/web/display/src/display.css
index 77c96dd..6aa954d 100644
--- a/web/display/src/display.css
+++ b/web/display/src/display.css
@@ -1012,6 +1012,8 @@
   background-size: cover;
   background-position: center;
   pointer-events: none;
+  /* 在预先模糊的基础上再模糊多少，右下角「外观」里调；默认 none */
+  filter: var(--bg-filter, none);
 }
 
 :root {
@@ -1382,3 +1384,276 @@ input {
   height: 20px;
   flex: none;
 }
+
+/* 天气（雪、雨）：铺满窗口，和背景图同一层（在背景图后面画、所有内容的下面），不接收鼠标；所以卡片的毛玻璃会把它一起模糊，不会挡住任何组件 */
+.weather-layer {
+  position: fixed;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  z-index: -1;
+  pointer-events: none;
+  /* 滤色：粒子只会把背后的图提亮，边缘羽化的地方自然融进图里 */
+  mix-blend-mode: screen;
+}
+
+@media (max-width: 640px), ((pointer: coarse) and (max-width: 900px)) {
+  .weather-layer {
+    display: none;
+  }
+}
+
+/* ── 右下角的「外观」：玻璃小按钮，点开是带分类的设置面板（亚克力同一套变量）；手机上不画雪也不能晃背景，这个也不显示 ── */
+.appearance {
+  position: fixed;
+  right: 16px;
+  bottom: 16px;
+  z-index: 35;
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 10px;
+}
+
+.appearance-fab {
+  display: grid;
+  place-items: center;
+  width: 40px;
+  height: 40px;
+  padding: 0;
+  border: 0;
+  border-radius: 50%;
+  color: var(--app-ink-muted);
+  background: var(--glass-bg);
+  backdrop-filter: var(--glass-filter);
+  box-shadow:
+    inset 0 0 0 1px var(--glass-ring),
+    inset 0 1px 0 var(--glass-top),
+    var(--glass-drop);
+  cursor: pointer;
+  transition: color 0.15s;
+}
+
+.appearance-fab svg {
+  transition: transform 0.35s cubic-bezier(0.34, 1.4, 0.64, 1);
+}
+
+.appearance-fab:hover,
+.appearance-fab[aria-expanded='true'] {
+  color: var(--app-ink);
+}
+
+.appearance-fab[aria-expanded='true'] svg {
+  transform: rotate(60deg);
+}
+
+/* 面板：从按钮的位置（右下角）展开 / 收起；一直在 DOM 里，用 data-open 切换，这样收起的时候也有动画 */
+.appearance-panel {
+  width: 300px;
+  padding: 14px 16px 16px;
+  border-radius: var(--r-card);
+  background: var(--glass-bg);
+  backdrop-filter: var(--glass-filter);
+  box-shadow:
+    inset 0 0 0 1px var(--glass-ring),
+    inset 0 1px 0 var(--glass-top),
+    var(--glass-drop);
+  color: var(--app-ink);
+  font-size: 13px;
+  transform-origin: bottom right;
+  transition:
+    opacity 0.22s ease,
+    transform 0.28s cubic-bezier(0.2, 0.9, 0.3, 1.15),
+    visibility 0s linear 0.28s;
+}
+
+.appearance-panel[data-open='false'] {
+  opacity: 0;
+  visibility: hidden;
+  transform: translateY(10px) scale(0.92);
+  pointer-events: none;
+}
+
+.appearance-panel[data-open='true'] {
+  opacity: 1;
+  visibility: visible;
+  transform: none;
+  transition-delay: 0s;
+}
+
+.appearance-tabs {
+  position: relative;
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  margin-bottom: 12px;
+  padding: 3px;
+  border-radius: var(--r-pill);
+  background: color-mix(in srgb, var(--app-ink) 8%, transparent);
+}
+
+/* 选中的那一格的底：随选中的分类滑过去 */
+.appearance-tabs::before {
+  content: '';
+  position: absolute;
+  top: 3px;
+  bottom: 3px;
+  left: 3px;
+  width: calc(50% - 3px);
+  border-radius: var(--r-pill);
+  background: var(--app-card);
+  box-shadow: 0 1px 3px color-mix(in srgb, var(--glass-shade) 25%, transparent);
+  transform: translateX(var(--tab-offset, 0));
+  transition: transform 0.28s cubic-bezier(0.3, 0.9, 0.3, 1.1);
+}
+
+.appearance-tabs[data-tab='background']::before {
+  --tab-offset: 100%;
+}
+
+.appearance-tabs button {
+  position: relative;
+  padding: 5px 0;
+  border: 0;
+  border-radius: var(--r-pill);
+  color: var(--app-ink-muted);
+  background: none;
+  cursor: pointer;
+  transition: color 0.2s;
+}
+
+.appearance-tabs button[aria-selected='true'] {
+  color: var(--app-ink);
+  font-weight: 600;
+}
+
+/* 切换分类时内容淡入、轻轻上浮；每一行再错开一点 */
+.appearance-body {
+  display: grid;
+  gap: 9px;
+}
+
+.appearance-body > * {
+  animation: appearance-in 0.32s ease both;
+}
+
+.appearance-body > :nth-child(2) { animation-delay: 0.03s; }
+.appearance-body > :nth-child(3) { animation-delay: 0.06s; }
+.appearance-body > :nth-child(4) { animation-delay: 0.09s; }
+.appearance-body > :nth-child(5) { animation-delay: 0.12s; }
+.appearance-body > :nth-child(6) { animation-delay: 0.15s; }
+.appearance-body > :nth-child(7) { animation-delay: 0.18s; }
+.appearance-body > :nth-child(8) { animation-delay: 0.21s; }
+.appearance-body > :nth-child(9) { animation-delay: 0.24s; }
+
+@keyframes appearance-in {
+  from {
+    opacity: 0;
+    transform: translateY(6px);
+  }
+}
+
+.appearance-body[data-off='true'] .appearance-row:not(.appearance-master) {
+  opacity: 0.45;
+  pointer-events: none;
+}
+
+.appearance-row {
+  display: grid;
+  grid-template-columns: 52px 1fr 44px;
+  align-items: center;
+  gap: 8px;
+  transition: opacity 0.2s;
+}
+
+.appearance-row-switch {
+  grid-template-columns: 1fr auto;
+}
+
+.appearance-row output {
+  text-align: right;
+  color: var(--app-ink-muted);
+  font-variant-numeric: tabular-nums;
+}
+
+.appearance-row input[type='range'] {
+  width: 100%;
+  accent-color: var(--app-primary);
+}
+
+.appearance-switch {
+  position: relative;
+  display: inline-block;
+  width: 34px;
+  height: 20px;
+}
+
+.appearance-switch input {
+  position: absolute;
+  inset: 0;
+  margin: 0;
+  opacity: 0;
+  cursor: pointer;
+}
+
+.appearance-switch span {
+  position: absolute;
+  inset: 0;
+  border-radius: 10px;
+  background: color-mix(in srgb, var(--app-ink) 22%, transparent);
+  pointer-events: none;
+  transition: background 0.2s;
+}
+
+.appearance-switch span::after {
+  content: '';
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 16px;
+  height: 16px;
+  border-radius: 50%;
+  background: var(--app-card);
+  transition: transform 0.25s cubic-bezier(0.34, 1.4, 0.64, 1);
+}
+
+.appearance-switch input:checked + span {
+  background: var(--app-primary);
+}
+
+.appearance-switch input:checked + span::after {
+  transform: translateX(14px);
+}
+
+.appearance-reset {
+  margin-top: 12px;
+  width: 100%;
+  padding: 6px 0;
+  border: 0;
+  border-radius: var(--r-pill);
+  color: var(--app-ink-muted);
+  background: color-mix(in srgb, var(--app-ink) 8%, transparent);
+  cursor: pointer;
+  transition: opacity 0.2s;
+}
+
+.appearance-reset:disabled {
+  opacity: 0.4;
+  cursor: default;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .appearance-panel,
+  .appearance-tabs::before,
+  .appearance-body > *,
+  .appearance-fab svg,
+  .appearance-switch span::after {
+    animation: none;
+    transition: none;
+  }
+}
+
+@media (max-width: 640px), ((pointer: coarse) and (max-width: 900px)) {
+  .appearance {
+    display: none;
+  }
+}
diff --git a/web/display/src/parallax.ts b/web/display/src/parallax.ts
index 1e2a805..8c32442 100644
--- a/web/display/src/parallax.ts
+++ b/web/display/src/parallax.ts
@@ -1,9 +1,12 @@
 import { useEffect, type RefObject } from 'react'
+import { getAppearance } from './appearance'
 
 /** 指针在窗口里的位置带来的偏移上限（像素）：鼠标停在窗口边缘时背景偏这么多。 */
 const POSITION_SHIFT = 30
 /** 鼠标移动时额外的晃动上限（像素）：移得越快晃得越多，停下来就慢慢回到位置对应的偏移。两项加起来不能超过 display.css 里背景层向外多出来的边距（130px）。 */
 const SWAY_MAX = 90
+/** 背景最多偏移多少像素（要比 display.css 里背景层向外多出来的边距 130px 小，否则会露边；设置里把幅度调大时靠它兜底）。 */
+const MAX_OFFSET = 125
 /** 每移动 1 像素，晃动增加多少像素。 */
 const SWAY_GAIN = 0.8
 /** 晃动每一帧衰减到多少：越接近 1，晃得越久。 */
@@ -40,7 +43,7 @@ export function useBackgroundParallax(layer: RefObject<HTMLElement | null>) {
       const targetY = baseY + swayY
       x += (targetX - x) * EASE
       y += (targetY - y) * EASE
-      element.style.transform = `translate3d(${x.toFixed(2)}px, ${y.toFixed(2)}px, 0)`
+      element.style.transform = `translate3d(${Math.max(-MAX_OFFSET, Math.min(MAX_OFFSET, x)).toFixed(2)}px, ${Math.max(-MAX_OFFSET, Math.min(MAX_OFFSET, y)).toFixed(2)}px, 0)`
       const moving = Math.abs(targetX - x) > 0.05 || Math.abs(targetY - y) > 0.05 || Math.abs(swayX) > 0.05 || Math.abs(swayY) > 0.05
       frame = moving ? requestAnimationFrame(step) : 0
     }
@@ -50,12 +53,13 @@ export function useBackgroundParallax(layer: RefObject<HTMLElement | null>) {
     const clamp = (value: number) => Math.max(-SWAY_MAX, Math.min(SWAY_MAX, value))
     const move = (event: PointerEvent) => {
       // 位置：指针在窗口里的位置换成 -1 到 1（背景朝同一个方向偏移，想要反方向就把符号取反）
-      baseX = ((event.clientX / window.innerWidth) * 2 - 1) * POSITION_SHIFT
-      baseY = ((event.clientY / window.innerHeight) * 2 - 1) * POSITION_SHIFT
+      const amount = getAppearance().parallax
+      baseX = ((event.clientX / window.innerWidth) * 2 - 1) * POSITION_SHIFT * amount
+      baseY = ((event.clientY / window.innerHeight) * 2 - 1) * POSITION_SHIFT * amount
       // 晃动：这一次移动了多远，就再推背景一把
       if (lastX !== null && lastY !== null) {
-        swayX = clamp(swayX + (event.clientX - lastX) * SWAY_GAIN)
-        swayY = clamp(swayY + (event.clientY - lastY) * SWAY_GAIN)
+        swayX = clamp(swayX + (event.clientX - lastX) * SWAY_GAIN * amount)
+        swayY = clamp(swayY + (event.clientY - lastY) * SWAY_GAIN * amount)
       }
       lastX = event.clientX
       lastY = event.clientY
diff --git a/web/display/src/weather/Weather.tsx b/web/display/src/weather/Weather.tsx
new file mode 100644
index 0000000..a824bd7
--- /dev/null
+++ b/web/display/src/weather/Weather.tsx
@@ -0,0 +1,10 @@
+import { useRef } from 'react'
+import { useWeather } from './engine'
+import type { Preset } from './presets'
+
+/** 整页的天气画布（雪、雨……）：preset 换一个就换一种天气，见 presets.ts。 */
+export function Weather({ preset }: { preset: Preset }) {
+  const canvas = useRef<HTMLCanvasElement>(null)
+  useWeather(canvas, preset)
+  return <canvas ref={canvas} className="weather-layer" aria-hidden="true" />
+}
diff --git a/web/display/src/weather/engine.ts b/web/display/src/weather/engine.ts
new file mode 100644
index 0000000..b557852
--- /dev/null
+++ b/web/display/src/weather/engine.ts
@@ -0,0 +1,277 @@
+import { useEffect, type RefObject } from 'react'
+import type { Layer, Preset } from './presets'
+import { getAppearance, subscribeAppearance } from '../appearance'
+
+/** 手机和窄屏不画。 */
+const PHONE = '(max-width: 640px), ((pointer: coarse) and (max-width: 900px))'
+/** 单帧最长的时间步（秒）：切回标签页等造成长时间没画时，别让粒子一下子跳很远。 */
+const MAX_STEP = 0.05
+
+/** 风：每隔一阵（1.5–6 秒）随机换一个目标风速（像素/秒，正是向右，负是向左），偶尔来一阵很大的阵风；实际风速慢慢追上目标，所以是「一阵一阵」的。 */
+const GUST_CHANCE = 0.15
+/** 风向偏向左边（自右向左吹）的概率：剩下的偶尔反向吹一下。 */
+const LEFT_BIAS = 0.85
+const WIND_INTERVAL = [1.5, 6] as const
+/** 实际风速追上目标的时间常数（秒）：越大风越「绵」。 */
+const WIND_EASE_SECONDS = 1.1
+
+/**
+ * 和鼠标的互动：
+ * - 鼠标横向快速移动，会把粒子向同一个方向吹（鼠标速度 × MOUSE_WIND，叠加在风上，之后慢慢散去）；
+ * - 鼠标在窗口左边、右边，粒子会轻轻往那一侧飘一点（MOUSE_LEAN 像素/秒，在最边上时的值）；
+ * - 鼠标附近 MOUSE_RADIUS 像素内的粒子会被推开。
+ */
+const MOUSE_WIND = 0.35
+const MOUSE_WIND_MAX = 380
+const MOUSE_WIND_FADE_SECONDS = 0.7
+const MOUSE_LEAN = 45
+const MOUSE_RADIUS = 130
+const MOUSE_PUSH = 900
+
+/**
+ * 子弹时间：鼠标在一个点上停住超过 BULLET_DWELL_SECONDS 秒，以它为中心 BULLET_RADIUS 像素内的雪就慢下来（中心最慢，只有 BULLET_SLOWEST 倍速，往外渐渐恢复），
+ * 看起来像时间在那一小块地方几乎停住；鼠标一动，慢动作就散开（BULLET_EASE_SECONDS 是进入和退出的快慢）。鼠标停住的时候不再拨动雪，只是慢下来。
+ */
+const BULLET_DWELL_SECONDS = 0.25
+const BULLET_RADIUS = 260
+const BULLET_SLOWEST = 0.08
+const BULLET_EASE_SECONDS = 0.35
+
+interface Particle {
+  layer: number
+  size: number
+  x: number
+  y: number
+  /** 下落速度的随机系数，以及忽快忽慢的相位和频率。 */
+  fall: number
+  pulse: number
+  pulseFreq: number
+  /** 水平速度（像素/秒），被风吹着慢慢追上风速 × 这个粒子自己吃风的系数。 */
+  vx: number
+  /** 被鼠标推开的额外速度（像素/秒），会衰减。 */
+  px: number
+  py: number
+  /** 这个粒子自己的时钟（秒）：在子弹时间里走得慢，晃动和忽快忽慢也跟着慢。 */
+  clock: number
+  lift: number
+  amp: number
+  freq: number
+  phase: number
+}
+
+const random = (min: number, max: number) => min + Math.random() * (max - min)
+const clamp = (value: number, limit: number) => Math.max(-limit, Math.min(limit, value))
+
+/**
+ * 天气（雪、雨……）的引擎：一块铺满窗口的画布，放在背景图的上面、所有内容的下面（和背景同一层），不接收鼠标。
+ * - 粒子分远、中、近三层（见 preset.layers），每层大小、速度、透明度、虚化程度、吃风的多少都不同，近景最糊最大，远景最小最淡，有景深；
+ * - 每个粒子下落速度各不相同、还会忽快忽慢；风是随机的一阵一阵（方向、大小、间隔都随机，偶尔有阵风）；鼠标会拨动粒子、带起风（见 MOUSE_*）；
+ * - 颜色取自令牌 --weather-core / --weather-halo（亮色、暗色各一套），切换主题时自动换；
+ * - 帧率跟着显示器走（每个显示帧画一次，位置按真实经过的时间算，165 Hz 的屏幕上速度也一样）；
+ *   开了「减少动态效果」，或者在手机和窄屏上，就不画；窗口大小变了就重新排布。
+ */
+export function useWeather(canvasRef: RefObject<HTMLCanvasElement | null>, preset: Preset) {
+  useEffect(() => {
+    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return
+    const phone = window.matchMedia(PHONE)
+    const canvas = canvasRef.current
+    const context = canvas?.getContext('2d')
+    if (!canvas || !context) return
+
+    let width = 0
+    let height = 0
+    let ratio = 1
+    let particles: Particle[] = []
+    let settings = getAppearance()
+    let sprites: HTMLCanvasElement[] = preset.layers.map((layer) => preset.makeSprite('#ffffff', '#ffffff', layer))
+    let frame = 0
+    let last = 0
+    let time = 0
+    let wind = 0
+    let windTarget = 0
+    let windChangeAt = 0
+    // 鼠标：位置（CSS 像素，没动过为 null）、上一次的位置和时间（算速度用）、鼠标带起的风
+    let pointerX: number | null = null
+    let pointerY = 0
+    let lastPointer: { x: number; t: number } | null = null
+    let mouseWind = 0
+    // 子弹时间：鼠标最后一次动是什么时候（秒，引擎自己的时钟）、慢动作现在有多强（0–1）
+    let lastMoveAt = 0
+    let bullet = 0
+
+    const tuned = (layer: Layer): Layer => ({ ...layer, blur: Math.max(0, Math.min(1, layer.blur + (settings.blur - 1) * 0.6)) })
+    const readColors = () => {
+      const style = getComputedStyle(document.documentElement)
+      const core = style.getPropertyValue('--weather-core').trim() || '#ffffff'
+      const halo = style.getPropertyValue('--weather-halo').trim() || '#ffffff'
+      sprites = preset.layers.map((layer) => preset.makeSprite(core, halo, tuned(layer)))
+    }
+    const spawn = (layer: number, anywhere: boolean): Particle => {
+      const spec = preset.layers[layer]
+      return {
+        layer,
+        size: random(spec.size[0], spec.size[1]) * settings.size,
+        x: random(0, width),
+        y: anywhere ? random(0, height) : -spec.size[1] * 3,
+        fall: random(0.55, 1.7),
+        pulse: random(0, Math.PI * 2),
+        pulseFreq: random(0.25, 0.8),
+        vx: wind * spec.wind,
+        px: 0,
+        py: 0,
+        clock: 0,
+        lift: random(0.6, 1.4),
+        amp: random(5, 18) * (layer + 1) * 0.6,
+        freq: random(0.3, 0.9),
+        phase: random(0, Math.PI * 2),
+      }
+    }
+    // 新粒子从顶上落下：不一定从哪一块，右上最多（风大多向左吹，吹着吹着就到了画面中间），中上、左上少一些
+    const spawnX = () => {
+      const pick = Math.random()
+      if (pick < 0.5) return random(width * 0.65, width * 1.5)
+      if (pick < 0.8) return random(width * 0.3, width * 0.65)
+      return random(0, width * 0.3)
+    }
+    const respawn = (particle: Particle) => Object.assign(particle, spawn(particle.layer, false), { x: spawnX() })
+    const layout = () => {
+      ratio = Math.min(window.devicePixelRatio || 1, 2)
+      width = window.innerWidth
+      height = window.innerHeight
+      canvas.width = Math.round(width * ratio)
+      canvas.height = Math.round(height * ratio)
+      const total = Math.round(Math.max(preset.minParticles, Math.min(preset.maxParticles, Math.round((width * height) / preset.areaPerParticle))) * settings.density)
+      particles = []
+      preset.layers.forEach((spec, layer) => {
+        for (let i = 0; i < Math.round(total * spec.share); i++) particles.push(spawn(layer, true))
+      })
+    }
+    const blow = () => {
+      // 随机方向、随机大小；一成多的时候是阵风（风速大得多）；有时候几乎无风
+      const strength = Math.random() < GUST_CHANCE ? random(0.45, 1) * preset.wind.gust : random(0, 1) * preset.wind.normal
+      windTarget = (Math.random() < LEFT_BIAS ? -1 : 1) * strength * (Math.random() < 0.12 ? 0.1 : 1)
+      windChangeAt = time + random(WIND_INTERVAL[0], WIND_INTERVAL[1])
+    }
+    const draw = (now: number) => {
+      frame = requestAnimationFrame(draw)
+      const frameDt = Math.min((now - (last || now)) / 1000, MAX_STEP)
+      last = now
+      const dt = frameDt
+      time += dt
+      if (time >= windChangeAt) blow()
+      wind += (windTarget - wind) * (1 - Math.exp(-dt / WIND_EASE_SECONDS))
+      mouseWind *= Math.exp(-dt / MOUSE_WIND_FADE_SECONDS)
+      // 鼠标在窗口左边/右边时，整体向那一侧轻轻偏一点
+      const lean = pointerX === null ? 0 : (pointerX / width - 0.5) * 2 * MOUSE_LEAN
+      const blowing = (wind + mouseWind + lean) * settings.wind
+      const dwelling = settings.bullet && pointerX !== null && time - lastMoveAt > BULLET_DWELL_SECONDS
+      bullet += ((dwelling ? 1 : 0) - bullet) * (1 - Math.exp(-dt / BULLET_EASE_SECONDS))
+
+      context.setTransform(ratio, 0, 0, ratio, 0, 0)
+      context.clearRect(0, 0, width, height)
+      for (const particle of particles) {
+        const spec = preset.layers[particle.layer]
+        // 子弹时间：离鼠标越近，这个粒子的时间走得越慢
+        let pace = 1
+        if (bullet > 0.001 && pointerX !== null) {
+          const near = 1 - Math.min(1, Math.hypot(particle.x - pointerX, particle.y - pointerY) / BULLET_RADIUS)
+          pace = 1 - bullet * (1 - BULLET_SLOWEST) * near * near * (3 - 2 * near)
+        }
+        const dt = frameDt * pace
+        particle.clock += dt
+        // 下落：层的速度 × 这个粒子自己的随机系数 × 忽快忽慢（±25%）；阵风还会带一点上升或下压的扰动
+        const speed = spec.speed * settings.speed * particle.fall * (1 + 0.25 * Math.sin(particle.pulse + particle.clock * particle.pulseFreq))
+        // 水平：被风吹着，速度慢慢追上「风速 × 这一层吃风的程度 × 这个的系数」
+        const wanted = blowing * spec.wind * particle.lift
+        particle.vx += (wanted - particle.vx) * (1 - Math.exp(-dt / 0.6))
+        // 鼠标拨动：离鼠标越近推得越狠，推开的速度很快衰减
+        if (settings.mouse && pointerX !== null && !dwelling) {
+          const dx = particle.x - pointerX
+          const dy = particle.y - pointerY
+          const distance = Math.hypot(dx, dy)
+          if (distance < MOUSE_RADIUS && distance > 0.5) {
+            const power = (1 - distance / MOUSE_RADIUS) ** 2 * MOUSE_PUSH * dt
+            particle.px += (dx / distance) * power
+            particle.py += (dy / distance) * power
+          }
+        }
+        particle.px *= Math.exp(-dt / 0.45)
+        particle.py *= Math.exp(-dt / 0.45)
+        const vy = speed + (windTarget - wind) * 0.04 * particle.lift + particle.py
+        const vx = particle.vx + particle.px
+        particle.y += vy * dt
+        particle.x += vx * dt
+        if (particle.y > height + particle.size * 3) {
+          respawn(particle)
+          continue
+        }
+        // 出了左右边就绕到另一边（右边多留了半个窗口：风向左吹，粒子从右边外面进来）
+        const span = width * 1.5 + 80
+        if (particle.x < -40) particle.x += span
+        else if (particle.x > width * 1.5 + 40) particle.x -= span
+        const x = particle.x + Math.sin(particle.phase + particle.clock * particle.freq) * particle.amp
+        preset.draw(context, sprites[particle.layer], x, particle.y, particle.size, Math.min(1, spec.alpha * settings.opacity), vx, vy)
+      }
+    }
+
+    const start = () => {
+      if (frame || phone.matches || !settings.enabled) return
+      last = 0
+      layout()
+      frame = requestAnimationFrame(draw)
+    }
+    const stop = () => {
+      cancelAnimationFrame(frame)
+      frame = 0
+      context.clearRect(0, 0, canvas.width, canvas.height)
+    }
+    // 手机和窄屏：不画（转屏、拖窗口变宽变窄时跟着开关）
+    const toggle = () => (phone.matches ? stop() : start())
+    const move = (event: PointerEvent) => {
+      const stamp = performance.now()
+      if (lastPointer) {
+        const seconds = Math.max((stamp - lastPointer.t) / 1000, 0.008)
+        mouseWind = clamp(mouseWind + ((event.clientX - lastPointer.x) / seconds) * MOUSE_WIND * 0.25, MOUSE_WIND_MAX)
+      }
+      lastMoveAt = time
+      lastPointer = { x: event.clientX, t: stamp }
+      pointerX = event.clientX
+      pointerY = event.clientY
+    }
+    const leave = () => {
+      pointerX = null
+      lastPointer = null
+    }
+    const resize = () => {
+      if (!phone.matches) layout()
+    }
+
+    // 设置变了：开关、数量、大小要重新排布，虚化要重做贴图，其余（速度、风、透明度等）下一帧自然读到新值
+    const changed = () => {
+      const before = settings
+      settings = getAppearance()
+      if (!settings.enabled) return stop()
+      if (!before.enabled) return start()
+      if (before.blur !== settings.blur) readColors()
+      if (before.density !== settings.density || before.size !== settings.size) layout()
+    }
+    const unsubscribe = subscribeAppearance(changed)
+    readColors()
+    start()
+    phone.addEventListener('change', toggle)
+    const observer = new MutationObserver(readColors)
+    observer.observe(document.documentElement, { attributes: true, attributeFilter: ['data-theme'] })
+    window.addEventListener('resize', resize)
+    window.addEventListener('pointermove', move, { passive: true })
+    document.documentElement.addEventListener('mouseleave', leave)
+    return () => {
+      cancelAnimationFrame(frame)
+      unsubscribe()
+      observer.disconnect()
+      phone.removeEventListener('change', toggle)
+      window.removeEventListener('resize', resize)
+      window.removeEventListener('pointermove', move)
+      document.documentElement.removeEventListener('mouseleave', leave)
+    }
+  }, [canvasRef, preset])
+}
diff --git a/web/display/src/weather/presets.ts b/web/display/src/weather/presets.ts
new file mode 100644
index 0000000..d7c875b
--- /dev/null
+++ b/web/display/src/weather/presets.ts
@@ -0,0 +1,93 @@
+/**
+ * 一层粒子（景深）：远景小、慢、淡；中景居中；近景大、快，但是糊成一团柔光（像对焦在背景上时前面飘过的雪）。
+ * 大小、速度之外，blur 决定边缘有多虚：0 是一个实心的圆点，1 是整个圆都在渐变（没有实心的核）。
+ */
+export interface Layer {
+  /** 大小范围（半径，CSS 像素）。 */
+  size: readonly [number, number]
+  /** 下落速度（像素/秒），每个粒子再乘一个随机系数。 */
+  speed: number
+  alpha: number
+  /** 模糊程度：0 清晰，1 完全虚化。 */
+  blur: number
+  /** 这一层占总数的比例。 */
+  share: number
+  /** 这一层吃多少风（远处的轻、离得远，被风吹得少一点；近处的被吹得多）。 */
+  wind: number
+}
+
+/**
+ * 一种天气（雪、雨……）：引擎只管粒子的位置、风、鼠标，长什么样由预设决定。
+ * 换成雨：新写一个 rain 预设（细长的线、速度快），在 App.tsx 里把 Weather 的 preset 换掉就行，引擎不用动。
+ */
+export interface Preset {
+  layers: readonly Layer[]
+  /** 每多少平方像素一个粒子，以及总数的上下限。 */
+  areaPerParticle: number
+  minParticles: number
+  maxParticles: number
+  /** 风速（像素/秒）：普通风的上限和阵风的上限。 */
+  wind: { normal: number; gust: number }
+  /** 给某一层做一张贴图：--weather-core 是粒子本身，--weather-halo 是外面的光晕（亮色底上用来托出白色）。 */
+  makeSprite(core: string, halo: string, layer: Layer): HTMLCanvasElement
+  /** 画一个在空中的粒子（x、y 是中心；vx、vy 是此刻的速度，雨要用它拉出方向）。 */
+  draw(context: CanvasRenderingContext2D, sprite: HTMLCanvasElement, x: number, y: number, size: number, alpha: number, vx: number, vy: number): void
+}
+
+/** 把任意 CSS 颜色解析成 [r, g, b]（借一个 1×1 的画布）。 */
+function parse(color: string): [number, number, number] {
+  const probe = document.createElement('canvas')
+  probe.width = 1
+  probe.height = 1
+  const context = probe.getContext('2d')
+  if (!context) return [255, 255, 255]
+  context.fillStyle = color
+  context.fillRect(0, 0, 1, 1)
+  const [r, g, b] = context.getImageData(0, 0, 1, 1).data
+  return [r, g, b]
+}
+
+export const snow: Preset = {
+  layers: [
+    { size: [1.2, 2.2], speed: 30, alpha: 0.42, blur: 0.9, share: 0.45, wind: 0.55 },
+    { size: [2.2, 3.8], speed: 56, alpha: 0.55, blur: 0.65, share: 0.35, wind: 0.85 },
+    { size: [7, 14], speed: 98, alpha: 0.34, blur: 0.97, share: 0.2, wind: 1.15 },
+  ],
+  areaPerParticle: 8500,
+  minParticles: 60,
+  maxParticles: 220,
+  wind: { normal: 130, gust: 320 },
+  // 一个柔和的圆点：中间是 core 色（blur 越大这一块越小），往外渐变成 halo 色的光晕，边缘透明
+  makeSprite(core, halo, layer) {
+    const side = 64
+    const sprite = document.createElement('canvas')
+    sprite.width = side
+    sprite.height = side
+    const context = sprite.getContext('2d')
+    if (!context) return sprite
+    const solid = 0.42 * (1 - layer.blur)
+    const [cr, cg, cb] = parse(core)
+    const [hr, hg, hb] = parse(halo)
+    const gradient = context.createRadialGradient(side / 2, side / 2, 0, side / 2, side / 2, side / 2)
+    gradient.addColorStop(0, `rgba(${cr}, ${cg}, ${cb}, 1)`)
+    gradient.addColorStop(solid, `rgba(${cr}, ${cg}, ${cb}, 1)`)
+    // 羽化：从实心的核到边缘，透明度按余弦曲线（两头缓、中间陡）一点点退到 0，颜色同时从 core 过渡到 halo，所以没有一圈生硬的边
+    const steps = 8
+    for (let i = 1; i <= steps; i++) {
+      const u = i / steps
+      const alpha = 0.5 * (1 + Math.cos(Math.PI * u))
+      const r = Math.round(cr + (hr - cr) * u)
+      const g = Math.round(cg + (hg - cg) * u)
+      const b = Math.round(cb + (hb - cb) * u)
+      gradient.addColorStop(solid + (1 - solid) * u, `rgba(${r}, ${g}, ${b}, ${alpha.toFixed(3)})`)
+    }
+    context.fillStyle = gradient
+    context.fillRect(0, 0, side, side)
+    return sprite
+  },
+  draw(context, sprite, x, y, size, alpha) {
+    const radius = size * 2.2
+    context.globalAlpha = alpha
+    context.drawImage(sprite, x - radius, y - radius, radius * 2, radius * 2)
+  },
+}
diff --git a/web/shared/theme/tokens.css b/web/shared/theme/tokens.css
index b89862a..573f15e 100644
--- a/web/shared/theme/tokens.css
+++ b/web/shared/theme/tokens.css
@@ -48,6 +48,10 @@
   --glass-shade: var(--app-shadow); /* 投影 */
   --glass-veil: var(--app-bg);     /* 盖在背景图上的那层底色 */
 
+  /* 雪花的颜色：亮色背景是白的，纯白的雪看不见，所以用偏蓝的灰；暗色就是白色 */
+  --weather-core: #f3f7ff; /* 不用纯白：带一点点冷色的白 */
+  --weather-halo: #bfd0f0; /* 粒子边缘羽化出去的颜色 */
+
   --chart-1: #2a5da8;
   --chart-2: #b9770e;
   --chart-3: #a23e2c;
@@ -78,11 +82,15 @@
   --app-scrim: #000000;
 
   /* 暗色的玻璃：偏蓝紫的冷色深蓝灰（和背景插画的色调一致），描边和上沿反光用白色，投影用带一点蓝的近黑 */
-  --glass-tint: #1b1e2d;
+  /* 暗色的玻璃和盖在背景图上的底色：从背景图自己的平均色算出来（见 display/src/backgroundTint.ts 写进 --bg-tint 的值，压暗、降低饱和度），不再是固定的蓝；没算出来之前用下面的回退色 */
+  --glass-tint: var(--bg-tint, #1d1c24);
   --glass-light: #ffffff;
   --glass-line: #ffffff;
   --glass-shade: #04061a;
-  --glass-veil: #12141d;
+  --glass-veil: var(--bg-veil-tint, #131217);
+
+  --weather-core: #e6edfb;
+  --weather-halo: #b4c4ea;
 
   --app-bg: #181714;
   --app-card: #211f1b;