diff --git a/.gitignore b/.gitignore
index e947f30..4587307 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,4 @@ node_modules/
 # OMC runtime state
 .omc/
 logs/
+.claude/
\ No newline at end of file
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 6786acf..cdf5fa0 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -111,3 +111,142 @@ CalendarMonthView (顶层屏幕)
 **折叠动画：** `CalendarViewModel.collapseProgress` 控制 0f(月)↔1f(周) 过渡。`BottomCard` 捕获垂直拖拽，释放时超过 50% 则弹簧动画吸附到最近状态。完全折叠后 `WeekPager` 替代 `CalendarPager` 实现高效单周分页。
 
 **分页映射：** 两个 Pager 均使用 `Int.MAX_VALUE` 页数，中心页为 `Int.MAX_VALUE / 2`。页码到日期为算术转换，无索引列表。两者均跳过初始 `snapshotFlow` 发射 (`.drop(1)`) 以保留首次渲染时的"今日"选中。
+
+## 性能排查（Perfetto / Systrace）
+
+项目使用 `composeTraceBeginSection` / `composeTraceEndSection` 在关键代码段插入 trace marker，Android 上会被记录到系统 trace 中。iOS 为空操作。
+
+已有的 trace section：
+- `MonthView:Compose` / `YearView:Compose` — 顶层重组耗时
+- `YearView→MonthView` / `MonthView→YearView` — 年视图切换动画
+- `YearGridView:$year` / `generateMiniMonthDays:$year-$month` — 年网格渲染
+- `getMonthDays:$year-$month` — 月网格数据生成
+
+### 分析折叠器卡顿的方法
+
+1. **录制 trace**：Android Studio → Profiler → CPU → 选择 "Trace Java Methods" 或命令行：
+   ```bash
+   adb shell perfetto -c - --txt \<<EOF
+   buffers: { size_kb: 65536 }
+   data_sources: {
+     config {
+       name: "linux.ftrace"
+       ftrace_config {
+         ftrace_events: "ftrace/print"
+         ftrace_events: "sched/sched_switch"
+         buffer_size_kb: 8192
+       }
+     }
+   }
+   data_sources: {
+     config {
+       name: "android.packages_list"
+     }
+   }
+   duration_ms: 10000
+   EOF
+   ```
+
+2. **用 Python 分析 trace**（无需 Perfetto UI）：
+
+   ```python
+   def read_varint(data, offset):
+       result = 0; shift = 0
+       while offset < len(data):
+           byte = data[offset]
+           result |= (byte & 0x7F) << shift
+           offset += 1
+           if not (byte & 0x80): break
+           shift += 7
+       return result, offset
+
+   def parse_trace(path):
+       with open(path, 'rb') as f:
+           data = f.read()
+
+       # 1) 读取所有 TracePacket
+       packets = []
+       offset = 0
+       while offset < len(data):
+           if data[offset] != 0x0a:
+               offset += 1; continue
+           offset += 1
+           try:
+               length, new_offset = read_varint(data, offset)
+               if 0 < length < 1_000_000 and new_offset + length <= len(data):
+                   packets.append(data[new_offset:new_offset + length])
+                   offset = new_offset + length
+               else:
+                   offset = new_offset
+           except:
+               offset += 1
+
+       # 2) 在 ftrace_events 中搜索自定义 marker
+       events = []
+       for pkt in packets:
+           # 找 field 2 (ftrace_events bundle)
+           po = 0
+           while po < len(pkt):
+               if po >= len(pkt): break
+               tag = pkt[po]; po += 1
+               fn = tag >> 3; wt = tag & 0x07
+               if wt == 0:
+                   _, po = read_varint(pkt, po)
+               elif wt == 2:
+                   length, po = read_varint(pkt, po)
+                   chunk = pkt[po:po + length]
+                   if fn == 2:
+                       # 扫描 bundle 内的 FtraceEvent (field 1, 0x0a)
+                       eo = 0
+                       while eo < len(chunk):
+                           if chunk[eo] != 0x0a:
+                               eo += 1; continue
+                           eo += 1
+                           try:
+                               el, eno = read_varint(chunk, eo)
+                               if el > 0 and eno + el <= len(chunk):
+                                   evt = chunk[eno:eno + el]
+                                   # 提取 timestamp (field 1, varint)
+                                   if len(evt) > 1 and evt[0] == 0x08:
+                                       ts, _ = read_varint(evt, 1)
+                                       # 搜索 marker 字符串
+                                       for pat in [b'BC:', b'VM:', b'MonthView:']:
+                                           idx = evt.find(pat)
+                                           if idx >= 0:
+                                               me = idx
+                                               while me < len(evt) and 32 <= evt[me] < 127:
+                                                   me += 1
+                                               name = evt[idx:me].decode()
+                                               events.append((ts, name))
+                                               break
+                                   eo = eno + el
+                               else:
+                                   eo = eno
+                           except:
+                               eo += 1
+                   po += length
+               elif wt in (1, 5):
+                   po += 8 if wt == 1 else 4
+               else:
+                   break
+
+       events.sort()
+       return events
+
+   # 使用
+   events = parse_trace('cpu-perfetto-xxxx.trace')
+   for ts, name in events:
+       print(f"{ts}: {name}")
+   ```
+
+3. **关注点**：
+   - **触摸事件间隔**：统计相邻 `BC:delta` marker 的时间差。理想间隔 ≤16ms；若出现 >33ms 说明丢帧，>100ms 说明触摸断流。
+   - **重组耗时**：`VM:collapseProgress` → `MonthView:Compose` 的间隔，应在亚毫秒级。
+   - **ViewModel → Compose 延迟**：从 `snapTo` 调用到下一帧重组完成的间隔。
+
+### 已知排查结论（2026-05-19）
+
+对折叠器 trace 的分析显示：
+- **重组本身很快**（VM progress → Compose 约 500μs），不是卡顿来源。
+- **触摸事件采样间隔不均匀**是主要问题。某些拖拽序列中出现 30-50ms 的触摸事件间隔，偶尔有 >100ms 的断流。这属于系统/模拟器层的事件分发问题，而非 Compose 代码问题。
+- 若在真机上复现，建议检查是否有 CPU 抢占或手指短暂离屏。
diff --git a/androidApp/build.gradle.kts b/androidApp/build.gradle.kts
index 5f63ce9..25c2209 100644
--- a/androidApp/build.gradle.kts
+++ b/androidApp/build.gradle.kts
@@ -14,11 +14,55 @@ android {
         targetSdk = libs.versions.android.targetSdk.get().toInt()
         versionCode = 1
         versionName = "1.0"
+
+        ndk {
+            abiFilters += listOf("arm64-v8a", "armeabi-v7a")
+        }
     }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+
+    buildFeatures {
+        buildConfig = false
+    }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
     }
+
+    packaging {
+        resources {
+            excludes += listOf(
+                "/META-INF/{AL2.0,LGPL2.1}",
+                "/META-INF/LICENSE*",
+                "/META-INF/NOTICE*",
+                "META-INF/DEPENDENCIES",
+                "**/*.kotlin_metadata",
+                "**/*.kotlin_module",
+            )
+            pickFirsts += listOf(
+                "META-INF/INDEX.LIST",
+                "META-INF/io.netty.versions.properties",
+            )
+        }
+    }
+
+    bundle {
+        language { enableSplit = true }
+        density { enableSplit = true }
+        abi { enableSplit = true }
+    }
 }
 
 dependencies {
diff --git a/androidApp/proguard-rules.pro b/androidApp/proguard-rules.pro
new file mode 100644
index 0000000..540142c
--- /dev/null
+++ b/androidApp/proguard-rules.pro
@@ -0,0 +1,20 @@
+# Kotlin Metadata (required for KMP)
+-keep class kotlin.Metadata { *; }
+-keepattributes *Annotation*, Signature, InnerClasses, EnclosingMethod
+
+# kotlinx.datetime
+-keep class kotlinx.datetime.** { *; }
+
+# tyme4kt (Chinese traditional calendar)
+-keep class cn.tyme.** { *; }
+
+# Compose runtime reflective lookups
+-keep class androidx.compose.runtime.** { *; }
+
+# ViewModel (used by CalendarViewModel)
+-keep class * extends androidx.lifecycle.ViewModel { *; }
+
+# Keep entry point composables referenced by string name
+-keepclassmembers class * {
+    @androidx.compose.runtime.Composable <methods>;
+}
diff --git a/androidApp/src/main/AndroidManifest.xml b/androidApp/src/main/AndroidManifest.xml
index 26403a7..298cd22 100644
--- a/androidApp/src/main/AndroidManifest.xml
+++ b/androidApp/src/main/AndroidManifest.xml
@@ -7,7 +7,7 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@android:style/Theme.Material.Light.NoActionBar">
+        android:theme="@style/Theme.YaYa">
         <activity
             android:exported="true"
             android:name=".MainActivity">
diff --git a/androidApp/src/main/res/values-night/themes.xml b/androidApp/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000..ab14fc2
--- /dev/null
+++ b/androidApp/src/main/res/values-night/themes.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.YaYa" parent="@android:style/Theme.Material.NoActionBar" />
+</resources>
diff --git a/androidApp/src/main/res/values/themes.xml b/androidApp/src/main/res/values/themes.xml
new file mode 100644
index 0000000..3832c72
--- /dev/null
+++ b/androidApp/src/main/res/values/themes.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.YaYa" parent="@android:style/Theme.Material.Light.NoActionBar" />
+</resources>
diff --git a/gradle.properties b/gradle.properties
index 9c2f0cf..4177846 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,11 +6,14 @@ kotlin.daemon.jvmargs=-Xmx3072M
 org.gradle.jvmargs=-Xmx4096M -Dfile.encoding=UTF-8
 org.gradle.configuration-cache=true
 org.gradle.caching=true
+org.gradle.parallel=true
+org.gradle.daemon=true
 
 #Android
 android.nonTransitiveRClass=true
 android.useAndroidX=true
 android.uniquePackageNames=false
 android.dependency.useConstraints=true
-android.r8.strictFullModeForKeepRules=false
+android.r8.strictFullModeForKeepRules=true
 android.generateSyncIssueWhenLibraryConstraintsAreEnabled=false
+android.enableR8.fullMode=true
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 559e70d..997fd04 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -14,7 +14,8 @@ junit = "4.13.2"
 kotlin = "2.3.21"
 material3 = "1.10.0-alpha05"
 kotlinx-datetime = "0.8.0"
-tyme4kt = "1.4.4"
+tyme4kt = "1.4.5"
+sketch = "4.4.0"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
@@ -30,6 +31,9 @@ compose-uiToolingPreview = { module = "org.jetbrains.compose.ui:ui-tooling-previ
 kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version.ref = "kotlinx-datetime" }
 kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version = "1.11.0" }
 tyme4kt = { module = "cn.6tail:tyme4kt", version.ref = "tyme4kt" }
+sketch-compose = { module = "io.github.panpf.sketch4:sketch-compose", version.ref = "sketch" }
+sketch-animated-gif = { module = "io.github.panpf.sketch4:sketch-animated-gif", version.ref = "sketch" }
+sketch-compose-resources = { module = "io.github.panpf.sketch4:sketch-compose-resources", version.ref = "sketch" }
 
 [plugins]
 androidApplication = { id = "com.android.application", version.ref = "agp" }
diff --git a/shared/build.gradle.kts b/shared/build.gradle.kts
index 433742c..e087e53 100644
--- a/shared/build.gradle.kts
+++ b/shared/build.gradle.kts
@@ -46,6 +46,9 @@ kotlin {
             implementation(libs.androidx.lifecycle.runtimeCompose)
             implementation(libs.kotlinx.datetime)
             implementation(libs.tyme4kt)
+            implementation(libs.sketch.compose)
+            implementation(libs.sketch.animated.gif)
+            implementation(libs.sketch.compose.resources)
         }
         commonTest.dependencies {
             implementation(libs.kotlin.test)
diff --git a/shared/src/androidMain/kotlin/plus/rua/project/ComposeTrace.android.kt b/shared/src/androidMain/kotlin/plus/rua/project/ComposeTrace.android.kt
index af5faa7..a3f9403 100644
--- a/shared/src/androidMain/kotlin/plus/rua/project/ComposeTrace.android.kt
+++ b/shared/src/androidMain/kotlin/plus/rua/project/ComposeTrace.android.kt
@@ -2,6 +2,18 @@ package plus.rua.project
 
 import android.os.Trace
 
-actual fun composeTraceBeginSection(name: String) = Trace.beginSection(name)
+actual fun composeTraceBeginSection(name: String) {
+    try {
+        Trace.beginSection(name)
+    } catch (_: RuntimeException) {
+        // Trace API 在 host test 中未 stub；忽略
+    }
+}
 
-actual fun composeTraceEndSection() = Trace.endSection()
\ No newline at end of file
+actual fun composeTraceEndSection() {
+    try {
+        Trace.endSection()
+    } catch (_: RuntimeException) {
+        // Trace API 在 host test 中未 stub；忽略
+    }
+}
\ No newline at end of file
diff --git a/shared/src/commonMain/composeResources/drawable/puppy_1.gif b/shared/src/commonMain/composeResources/drawable/puppy_1.gif
new file mode 100644
index 0000000..6a044ba
Binary files /dev/null and b/shared/src/commonMain/composeResources/drawable/puppy_1.gif differ
diff --git a/shared/src/commonMain/composeResources/files/puppy_1.gif b/shared/src/commonMain/composeResources/files/puppy_1.gif
new file mode 100644
index 0000000..6a044ba
Binary files /dev/null and b/shared/src/commonMain/composeResources/files/puppy_1.gif differ
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/App.kt b/shared/src/commonMain/kotlin/plus/rua/project/App.kt
index c5693f4..2d87d1a 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/App.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/App.kt
@@ -1,18 +1,22 @@
 package plus.rua.project
 
+import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
 import plus.rua.project.ui.CalendarMonthView
 
 /**
- * 应用入口 Composable，包裹 CalendarMonthView 并提供 MaterialTheme。
+ * 应用入口 Composable，根据系统主题切换明暗 ColorScheme 并包裹 CalendarMonthView。
  */
 @Composable
 @Preview(name = "Calendar App")
 fun App() {
-    MaterialTheme {
+    val colorScheme = if (isSystemInDarkTheme()) darkColorScheme() else lightColorScheme()
+    MaterialTheme(colorScheme = colorScheme) {
         CalendarMonthView(modifier = Modifier)
     }
 }
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/CalendarViewModel.kt b/shared/src/commonMain/kotlin/plus/rua/project/CalendarViewModel.kt
index eeb795a..0d99b69 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/CalendarViewModel.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/CalendarViewModel.kt
@@ -106,7 +106,8 @@ class CalendarViewModel(
     }
 
     /**
-     * 切换年视图。仅在展开态可用。
+     * 切换年视图。折叠态下保持折叠（`isCollapsed` 不变），
+     * 月视图层以折叠形态参与缩放转场；从年视图返回时仍是周视图。
      *
      * 切换瞬间立即翻转 isYearView，让对应方向的目标视图立刻接管渲染，
      * 当前视图被直接移除；动画只作用在目标视图的 scale/alpha 上。
@@ -114,13 +115,6 @@ class CalendarViewModel(
     fun toggleYearView() {
         yearViewJob?.cancel()
         yearViewJob = coroutineScope.launch {
-            // 折叠态先展开回月视图，再切换年视图
-            if (isCollapsed) {
-                _collapseAnimatable.animateTo(
-                    0f, spring(dampingRatio = 0.8f, stiffness = 400f)
-                )
-                isCollapsed = false
-            }
             if (isYearView) {
                 // 年 → 月：先启动动画（年视图开始淡出），等一帧后翻转 isYearView（月视图开始组合）
                 composeTraceBeginSection("YearView→MonthView")
@@ -186,8 +180,9 @@ class CalendarViewModel(
      * @param delta 拖拽增量，已归一化到 [0,1] 区间
      */
     fun onDrag(delta: Float) {
+        val old = _collapseAnimatable.value
         coroutineScope.launch {
-            val new = (_collapseAnimatable.value + delta).coerceIn(0f, 1f)
+            val new = (old + delta).coerceIn(0f, 1f)
             _collapseAnimatable.snapTo(new)
         }
     }
@@ -203,9 +198,9 @@ class CalendarViewModel(
         coroutineScope.launch {
             val progress = _collapseAnimatable.value
             val shouldCollapse = when {
-                velocityDpPerSec > FLING_VELOCITY_THRESHOLD_DP -> true   // 快速上滑→折叠
-                velocityDpPerSec < -FLING_VELOCITY_THRESHOLD_DP -> false // 快速下滑→展开
-                else -> progress > COLLAPSE_THRESHOLD                    // 慢速按 progress 判断
+                velocityDpPerSec > FLING_VELOCITY_THRESHOLD_DP -> true
+                velocityDpPerSec < -FLING_VELOCITY_THRESHOLD_DP -> false
+                else -> progress > COLLAPSE_THRESHOLD
             }
             if (shouldCollapse) {
                 _collapseAnimatable.animateTo(
@@ -228,8 +223,9 @@ class CalendarViewModel(
      * @param delta 拖拽增量，已归一化到 [0,1] 区间
      */
     fun onExpandDrag(delta: Float) {
+        val old = _collapseAnimatable.value
         coroutineScope.launch {
-            val new = (_collapseAnimatable.value + delta).coerceIn(0f, 1f)
+            val new = (old + delta).coerceIn(0f, 1f)
             _collapseAnimatable.snapTo(new)
         }
     }
@@ -245,9 +241,9 @@ class CalendarViewModel(
         coroutineScope.launch {
             val progress = _collapseAnimatable.value
             val shouldExpand = when {
-                velocityDpPerSec < -FLING_VELOCITY_THRESHOLD_DP -> true  // 快速下滑→展开
-                velocityDpPerSec > FLING_VELOCITY_THRESHOLD_DP -> false  // 快速上滑→保持折叠
-                else -> progress < 1f - COLLAPSE_THRESHOLD                    // 慢速按 progress 判断
+                velocityDpPerSec < -FLING_VELOCITY_THRESHOLD_DP -> true
+                velocityDpPerSec > FLING_VELOCITY_THRESHOLD_DP -> false
+                else -> progress < 1f - COLLAPSE_THRESHOLD
             }
             if (shouldExpand) {
                 _collapseAnimatable.animateTo(
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/ui/AnimatedGif.kt b/shared/src/commonMain/kotlin/plus/rua/project/ui/AnimatedGif.kt
new file mode 100644
index 0000000..9270b9c
--- /dev/null
+++ b/shared/src/commonMain/kotlin/plus/rua/project/ui/AnimatedGif.kt
@@ -0,0 +1,23 @@
+package plus.rua.project.ui
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import com.github.panpf.sketch.AsyncImage
+
+/**
+ * 显示动画 GIF 图片。
+ *
+ * @param modifier 应用于图片的 Modifier
+ * @param contentDescription 无障碍描述
+ */
+@Composable
+fun AnimatedGif(
+    modifier: Modifier = Modifier,
+    contentDescription: String? = null,
+) {
+    AsyncImage(
+        uri = "compose.resource://files/puppy_1.gif",
+        contentDescription = contentDescription,
+        modifier = modifier,
+    )
+}
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/ui/BottomCard.kt b/shared/src/commonMain/kotlin/plus/rua/project/ui/BottomCard.kt
index d4b9ccf..0a3d2b4 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/ui/BottomCard.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/ui/BottomCard.kt
@@ -2,14 +2,20 @@ package plus.rua.project.ui
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.detectVerticalDragGestures
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -17,12 +23,20 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import kotlinx.datetime.LocalDate
 import plus.rua.project.CalendarViewModel
 
 /**
  * 底部卡片，折叠状态下支持垂直拖拽触发折叠动画。
  *
+ * 卡片顶部显示拖拽把手，下方展示选中日期信息：
+ * 左侧为相对今天的天数描述（A）和公历日期（B），
+ * 右侧为农历日期（C）。
+ *
  * @param viewModel 日历 ViewModel，用于读取折叠状态和驱动拖拽
+ * @param selectedDate 当前选中的日期
+ * @param today 今天的日期
  * @param dragRangePx 拖拽手势映射范围（像素），progress 从 0→1 对应手指移动此距离。
  *   应设为折叠时日历实际高度变化量 (weeks-1)×rowHeight，使拖拽跟手。
  * @param modifier 外部布局修饰符
@@ -30,10 +44,17 @@ import plus.rua.project.CalendarViewModel
 @Composable
 fun BottomCard(
     viewModel: CalendarViewModel,
+    selectedDate: LocalDate,
+    today: LocalDate,
     dragRangePx: Float,
     modifier: Modifier = Modifier
 ) {
     val density = LocalDensity.current
+    val relativeDesc = relativeDayDescription(selectedDate, today)
+
+    @Suppress("DEPRECATION") // monthNumber 无替代 API，kotlinx-datetime 尚未提供新接口
+    val solarDesc = "${selectedDate.monthNumber}月${selectedDate.day}日"
+    val lunarDesc = formatLunarDate(selectedDate)
 
     Surface(
         modifier = modifier
@@ -80,16 +101,52 @@ fun BottomCard(
         color = MaterialTheme.colorScheme.surfaceVariant,
         shadowElevation = 4.dp
     ) {
-        Box(modifier = Modifier.fillMaxSize()) {
+        Column(modifier = Modifier.fillMaxSize()) {
+            // 拖拽把手
             Box(
                 modifier = Modifier
-                    .align(Alignment.TopCenter)
                     .padding(top = 8.dp, bottom = 8.dp)
                     .clip(RoundedCornerShape(2.dp))
                     .background(MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.4f))
                     .fillMaxWidth(0.15f)
                     .height(4.dp)
+                    .align(Alignment.CenterHorizontally)
             )
+            Spacer(modifier = Modifier.height(8.dp))
+            // A / B / C 信息行
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 20.dp),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                // 左侧：A（相对天数）和 B（公历日期）在同一行
+                Row(
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = relativeDesc,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        fontSize = 14.sp
+                    )
+                    Spacer(modifier = Modifier.width(6.dp))
+                    Text(
+                        text = solarDesc,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        fontSize = 14.sp
+                    )
+                }
+                // 右侧：C（农历日期）
+                Text(
+                    text = lunarDesc,
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    fontSize = 14.sp
+                )
+            }
         }
     }
 }
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarMonthView.kt b/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarMonthView.kt
index 11d6366..bf31745 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarMonthView.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarMonthView.kt
@@ -23,6 +23,7 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.pager.HorizontalPager
 import androidx.compose.foundation.pager.PagerDefaults
 import androidx.compose.foundation.pager.rememberPagerState
+import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
@@ -311,6 +312,8 @@ fun CalendarMonthView(
                 if (cardHeightPx > 0) {
                     BottomCard(
                         viewModel = viewModel,
+                        selectedDate = viewModel.selectedDate,
+                        today = today,
                         dragRangePx = dragRangePx,
                         modifier = Modifier
                             .fillMaxWidth()
@@ -392,6 +395,7 @@ fun CalendarMonthView(
             modifier = Modifier
                 .align(Alignment.BottomStart)
                 .padding(start = 24.dp, bottom = 32.dp),
+            shape = CircleShape,
             containerColor = MaterialTheme.colorScheme.primaryContainer,
             contentColor = MaterialTheme.colorScheme.onPrimaryContainer
         ) {
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarUtils.kt b/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarUtils.kt
index 7afce9d..3482094 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarUtils.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/ui/CalendarUtils.kt
@@ -1,7 +1,9 @@
 package plus.rua.project.ui
 
+import com.tyme.solar.SolarDay
 import kotlinx.datetime.DatePeriod
 import kotlinx.datetime.LocalDate
+import kotlinx.datetime.daysUntil
 import kotlinx.datetime.minus
 import kotlinx.datetime.number
 import kotlinx.datetime.plus
@@ -10,7 +12,7 @@ import kotlinx.datetime.plus
 const val START_PAGE = Int.MAX_VALUE / 2
 
 /** 折叠判定阈值：折叠时 progress > 此值触发，展开时 progress < (1-此值) 触发 */
-const val COLLAPSE_THRESHOLD = 0.25f
+const val COLLAPSE_THRESHOLD = 0.08f
 
 /** 滑动偏移插值阈值：abs(offsetFraction) > 此值时启用插值 */
 const val OFFSET_FRACTION_THRESHOLD = 0.01f
@@ -130,3 +132,40 @@ fun pageToWeekMonday(page: Int, initial: LocalDate): LocalDate {
     val offset = page - START_PAGE
     return initial.plus(DatePeriod(days = offset * 7))
 }
+
+/**
+ * 计算选中日期相对于今天的天数描述。
+ *
+ * 例如今天 19 日，选中 18 日返回"昨天"，17 日返回"2天前"，
+ * 20 日返回"明天"，21 日返回"2天后"，选中当天返回"今天"。
+ *
+ * @param selectedDate 选中日期
+ * @param today 今天日期
+ * @return 相对天数描述
+ */
+fun relativeDayDescription(selectedDate: LocalDate, today: LocalDate): String {
+    val diff = today.daysUntil(selectedDate)
+    return when {
+        diff == 0 -> "今天"
+        diff == -1 -> "昨天"
+        diff == 1 -> "明天"
+        diff < 0 -> "${-diff}天前"
+        else -> "${diff}天后"
+    }
+}
+
+/**
+ * 将公历日期格式化为农历日期字符串。
+ *
+ * 格式为"农历{月}{日}"，例如"农历四月初三"。
+ *
+ * @param date 公历日期
+ * @return 农历日期描述
+ */
+@Suppress("DEPRECATION") // monthNumber 无替代 API，kotlinx-datetime 尚未提供新接口
+fun formatLunarDate(date: LocalDate): String {
+    val solarDay = SolarDay.fromYmd(date.year, date.monthNumber, date.day)
+    val lunarDay = solarDay.getLunarDay()
+    val lunarMonth = lunarDay.getLunarMonth()
+    return "农历${lunarMonth.getName()}${lunarDay.getName()}"
+}
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/ui/DayCell.kt b/shared/src/commonMain/kotlin/plus/rua/project/ui/DayCell.kt
index a8071a4..c6562bf 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/ui/DayCell.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/ui/DayCell.kt
@@ -5,7 +5,6 @@ import androidx.compose.animation.core.FastOutSlowInEasing
 import androidx.compose.animation.core.animateFloat
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.core.updateTransition
-import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Box
@@ -274,10 +273,8 @@ fun DayCell(
             }
             val shiftLabel = if (shiftKind == ShiftKind.WORK) "班" else "休"
             val shiftAlpha = if (isCurrentMonth) 1f else 0.38f
-            // 右上角(默认)沿用法定调休视觉:surface 背景 + 彩色文字;
+            // 右上角(默认)无背景,文字直接浮在单元格上;
             // 左上角(showLegalHoliday=true 时)用实心胶囊,与右上角法定调休区分。
-            val shiftBgColor =
-                if (showLegalHoliday) shiftAccentColor else MaterialTheme.colorScheme.surface
             val shiftFgColor = if (showLegalHoliday) shiftOnAccentColor else shiftAccentColor
             val shiftAlignment = if (showLegalHoliday) Alignment.TopStart else Alignment.TopEnd
             val shiftPadding = if (showLegalHoliday) {
@@ -295,7 +292,6 @@ fun DayCell(
                     .align(shiftAlignment)
                     .zIndex(1f)
                     .then(shiftPadding)
-                    .background(shiftBgColor.copy(alpha = shiftAlpha), CircleShape)
                     .padding(horizontal = 2.dp)
             )
         }
@@ -310,7 +306,6 @@ fun DayCell(
                     .align(Alignment.TopEnd)
                     .zIndex(1f)
                     .padding(top = 1.dp, end = 2.dp)
-                    .background(MaterialTheme.colorScheme.surface, CircleShape)
                     .padding(horizontal = 2.dp)
             )
         }
diff --git a/shared/src/commonMain/kotlin/plus/rua/project/ui/YearGridView.kt b/shared/src/commonMain/kotlin/plus/rua/project/ui/YearGridView.kt
index b84e7ad..d4a129a 100644
--- a/shared/src/commonMain/kotlin/plus/rua/project/ui/YearGridView.kt
+++ b/shared/src/commonMain/kotlin/plus/rua/project/ui/YearGridView.kt
@@ -112,7 +112,11 @@ fun YearGridView(
             listOf(
                 (month to true) to textMeasurer.measure(
                     text,
-                    TextStyle(fontSize = 10.sp, color = colors.titleSelected, fontWeight = FontWeight.Bold)
+                    TextStyle(
+                        fontSize = 10.sp,
+                        color = colors.titleSelected,
+                        fontWeight = FontWeight.Bold
+                    )
                 ),
                 (month to false) to textMeasurer.measure(
                     text,
diff --git a/shared/src/commonTest/kotlin/plus/rua/project/CalendarViewModelStateTest.kt b/shared/src/commonTest/kotlin/plus/rua/project/CalendarViewModelStateTest.kt
new file mode 100644
index 0000000..540a028
--- /dev/null
+++ b/shared/src/commonTest/kotlin/plus/rua/project/CalendarViewModelStateTest.kt
@@ -0,0 +1,365 @@
+package plus.rua.project
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.datetime.Clock
+import kotlinx.datetime.Instant
+import kotlinx.datetime.LocalDate
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertNotNull
+import kotlin.test.assertNull
+import kotlin.test.assertTrue
+
+private class StateTestFixedClock(private val instant: Instant) : Clock {
+    override fun now(): Instant = instant
+}
+
+/**
+ * 覆盖 [CalendarViewModel] 中与日期选择、年视图、班次、拖拽 progress 等
+ * 同步可观察状态相关的逻辑。
+ *
+ * 动画完成的最终状态（例如 [CalendarViewModel.isCollapsed] 在 spring
+ * 动画结束后的取值）需要 MonotonicFrameClock 驱动，不在本测试集合范围内。
+ */
+class CalendarViewModelStateTest {
+
+    // 固定 today = 2026/5/15
+    private val fixedInstant = Instant.parse("2026-05-15T00:00:00Z")
+    private val testClock = StateTestFixedClock(fixedInstant)
+
+    private fun createViewModel(): CalendarViewModel {
+        val scope = CoroutineScope(Dispatchers.Unconfined)
+        return CalendarViewModel(coroutineScope = scope, clock = testClock)
+    }
+
+    // ---- 初始状态 ----
+
+    @Test
+    fun init_selectedDateIsToday() {
+        val vm = createViewModel()
+        assertEquals(LocalDate(2026, 5, 15), vm.selectedDate)
+    }
+
+    @Test
+    fun init_isCollapsedDefaultsFalse() {
+        assertFalse(createViewModel().isCollapsed)
+    }
+
+    @Test
+    fun init_collapseProgressDefaultsZero() {
+        assertEquals(0f, createViewModel().collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun init_isYearViewDefaultsFalse() {
+        assertFalse(createViewModel().isYearView)
+    }
+
+    @Test
+    fun init_yearViewProgressDefaultsZero() {
+        assertEquals(0f, createViewModel().yearViewProgress, 0.001f)
+    }
+
+    @Test
+    fun init_yearViewYearDefaultsToTodayYear() {
+        assertEquals(2026, createViewModel().yearViewYear)
+    }
+
+    @Test
+    fun init_showLegalHolidayDefaultsFalse() {
+        assertFalse(createViewModel().showLegalHoliday)
+    }
+
+    @Test
+    fun init_shiftPatternHasDefault() {
+        val pattern = createViewModel().shiftPattern
+        assertNotNull(pattern)
+        assertEquals(LocalDate(2026, 5, 15), pattern.anchorDate)
+        assertEquals(4, pattern.cycle.size)
+    }
+
+    @Test
+    fun init_currentMonthMatchesToday() {
+        assertEquals(5, createViewModel().currentMonth)
+    }
+
+    @Test
+    fun init_currentYearMatchesToday() {
+        assertEquals(2026, createViewModel().currentYear)
+    }
+
+    // ---- selectDate ----
+
+    @Test
+    fun selectDate_updatesSelectedDate() {
+        val vm = createViewModel()
+        vm.selectDate(LocalDate(2026, 6, 1))
+        assertEquals(LocalDate(2026, 6, 1), vm.selectedDate)
+    }
+
+    @Test
+    fun selectDate_currentMonthFollowsSelection() {
+        val vm = createViewModel()
+        vm.selectDate(LocalDate(2026, 8, 20))
+        assertEquals(8, vm.currentMonth)
+        assertEquals(2026, vm.currentYear)
+    }
+
+    @Test
+    fun selectDate_yearFollowsSelection() {
+        val vm = createViewModel()
+        vm.selectDate(LocalDate(2027, 1, 1))
+        assertEquals(2027, vm.currentYear)
+        assertEquals(1, vm.currentMonth)
+    }
+
+    @Test
+    fun selectDate_pastDate_updatesCorrectly() {
+        val vm = createViewModel()
+        vm.selectDate(LocalDate(2020, 12, 31))
+        assertEquals(LocalDate(2020, 12, 31), vm.selectedDate)
+        assertEquals(12, vm.currentMonth)
+        assertEquals(2020, vm.currentYear)
+    }
+
+    // ---- incrementYear / decrementYear ----
+
+    @Test
+    fun incrementYear_increasesYearViewYear() {
+        val vm = createViewModel()
+        vm.incrementYear()
+        assertEquals(2027, vm.yearViewYear)
+    }
+
+    @Test
+    fun decrementYear_decreasesYearViewYear() {
+        val vm = createViewModel()
+        vm.decrementYear()
+        assertEquals(2025, vm.yearViewYear)
+    }
+
+    @Test
+    fun incrementDecrementYear_consecutiveCalls() {
+        val vm = createViewModel()
+        repeat(5) { vm.incrementYear() }
+        assertEquals(2031, vm.yearViewYear)
+        repeat(3) { vm.decrementYear() }
+        assertEquals(2028, vm.yearViewYear)
+    }
+
+    @Test
+    fun incrementYear_doesNotAffectSelectedDate() {
+        val vm = createViewModel()
+        val before = vm.selectedDate
+        vm.incrementYear()
+        assertEquals(before, vm.selectedDate)
+    }
+
+    // ---- selectMonthFromYearView ----
+
+    @Test
+    fun selectMonthFromYearView_sameYearOtherMonth_setsFirstDayOfMonth() {
+        val vm = createViewModel()
+        vm.selectMonthFromYearView(8)
+        assertEquals(LocalDate(2026, 8, 1), vm.selectedDate)
+    }
+
+    @Test
+    fun selectMonthFromYearView_currentYearAndMonth_setsToToday() {
+        val vm = createViewModel()
+        // yearViewYear = 2026, today.month = 5
+        vm.selectMonthFromYearView(5)
+        assertEquals(LocalDate(2026, 5, 15), vm.selectedDate)
+    }
+
+    @Test
+    fun selectMonthFromYearView_otherYear_setsFirstDay() {
+        val vm = createViewModel()
+        vm.incrementYear() // yearViewYear = 2027
+        vm.selectMonthFromYearView(5)
+        assertEquals(LocalDate(2027, 5, 1), vm.selectedDate)
+    }
+
+    @Test
+    fun selectMonthFromYearView_setsIsYearViewFalse() {
+        val vm = createViewModel()
+        vm.selectMonthFromYearView(3)
+        assertFalse(vm.isYearView)
+    }
+
+    @Test
+    fun selectMonthFromYearView_january() {
+        val vm = createViewModel()
+        vm.selectMonthFromYearView(1)
+        assertEquals(LocalDate(2026, 1, 1), vm.selectedDate)
+    }
+
+    @Test
+    fun selectMonthFromYearView_december() {
+        val vm = createViewModel()
+        vm.selectMonthFromYearView(12)
+        assertEquals(LocalDate(2026, 12, 1), vm.selectedDate)
+    }
+
+    // ---- shiftKindAt ----
+
+    @Test
+    fun shiftKindAt_anchorDate_returnsWork() {
+        // default pattern: anchor 2026-05-15, cycle WORK/WORK/OFF/OFF
+        val vm = createViewModel()
+        assertEquals(ShiftKind.WORK, vm.shiftKindAt(LocalDate(2026, 5, 15)))
+    }
+
+    @Test
+    fun shiftKindAt_dayAfterAnchor_returnsWork() {
+        val vm = createViewModel()
+        assertEquals(ShiftKind.WORK, vm.shiftKindAt(LocalDate(2026, 5, 16)))
+    }
+
+    @Test
+    fun shiftKindAt_twoDaysAfterAnchor_returnsOff() {
+        val vm = createViewModel()
+        assertEquals(ShiftKind.OFF, vm.shiftKindAt(LocalDate(2026, 5, 17)))
+    }
+
+    @Test
+    fun shiftKindAt_nullPattern_returnsNull() {
+        val vm = createViewModel()
+        vm.shiftPattern = null
+        assertNull(vm.shiftKindAt(LocalDate(2026, 5, 15)))
+    }
+
+    @Test
+    fun shiftKindAt_customPattern_usesNewPattern() {
+        val vm = createViewModel()
+        vm.shiftPattern = ShiftPattern(
+            anchorDate = LocalDate(2026, 5, 15),
+            cycle = listOf(ShiftKind.OFF, ShiftKind.WORK)
+        )
+        assertEquals(ShiftKind.OFF, vm.shiftKindAt(LocalDate(2026, 5, 15)))
+        assertEquals(ShiftKind.WORK, vm.shiftKindAt(LocalDate(2026, 5, 16)))
+        assertEquals(ShiftKind.OFF, vm.shiftKindAt(LocalDate(2026, 5, 17)))
+    }
+
+    // ---- showLegalHoliday ----
+
+    @Test
+    fun showLegalHoliday_canBeToggled() {
+        val vm = createViewModel()
+        assertFalse(vm.showLegalHoliday)
+        vm.showLegalHoliday = true
+        assertTrue(vm.showLegalHoliday)
+        vm.showLegalHoliday = false
+        assertFalse(vm.showLegalHoliday)
+    }
+
+    // ---- onDrag: 折叠拖拽（同步路径：snapTo）----
+
+    @Test
+    fun onDrag_positiveDelta_increasesProgress() {
+        val vm = createViewModel()
+        vm.onDrag(0.3f)
+        assertEquals(0.3f, vm.collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun onDrag_accumulatesAcrossCalls() {
+        val vm = createViewModel()
+        vm.onDrag(0.2f)
+        vm.onDrag(0.3f)
+        assertEquals(0.5f, vm.collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun onDrag_clampsAtOne() {
+        val vm = createViewModel()
+        vm.onDrag(0.8f)
+        vm.onDrag(0.8f)
+        assertEquals(1f, vm.collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun onDrag_clampsAtZeroWhenNegativeFromZero() {
+        val vm = createViewModel()
+        vm.onDrag(-0.3f)
+        assertEquals(0f, vm.collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun onDrag_negativeAfterPositive_canDecrease() {
+        val vm = createViewModel()
+        vm.onDrag(0.5f)
+        vm.onDrag(-0.2f)
+        assertEquals(0.3f, vm.collapseProgress, 0.001f)
+    }
+
+    // ---- onExpandDrag: 展开拖拽 ----
+
+    @Test
+    fun onExpandDrag_updatesProgress() {
+        val vm = createViewModel()
+        // 先把 progress 推到 1
+        vm.onDrag(1f)
+        assertEquals(1f, vm.collapseProgress, 0.001f)
+        // 展开方向：delta 为负
+        vm.onExpandDrag(-0.4f)
+        assertEquals(0.6f, vm.collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun onExpandDrag_clampsAtZero() {
+        val vm = createViewModel()
+        vm.onDrag(0.5f)
+        vm.onExpandDrag(-1f)
+        assertEquals(0f, vm.collapseProgress, 0.001f)
+    }
+
+    @Test
+    fun onExpandDrag_clampsAtOne() {
+        val vm = createViewModel()
+        vm.onExpandDrag(2f)
+        assertEquals(1f, vm.collapseProgress, 0.001f)
+    }
+
+    // ---- getMonthDays 与 selectedDate 配合 ----
+
+    @Test
+    fun getMonthDays_updatesIsSelectedAfterSelectDate() {
+        val vm = createViewModel()
+        vm.selectDate(LocalDate(2026, 5, 20))
+        val days = vm.getMonthDays(2026, 5)
+        val selectedCell = days.first { it.isSelected }
+        assertEquals(20, selectedCell.date.day)
+    }
+
+    @Test
+    fun getMonthDays_noCellSelectedInOtherMonth() {
+        val vm = createViewModel()
+        // selectedDate 默认是今天(5/15)，不在 2026/8 月内（含跨月填充也不可能）
+        val days = vm.getMonthDays(2026, 8)
+        assertTrue(days.none { it.isSelected })
+    }
+
+    @Test
+    fun getMonthDays_todayCellAlwaysReflectsTodayClock() {
+        val vm = createViewModel()
+        // 即便选中其他日期，isToday 依然根据 clock 注入的 today
+        vm.selectDate(LocalDate(2026, 5, 20))
+        val days = vm.getMonthDays(2026, 5)
+        val todayCell = days.first { it.isToday }
+        assertEquals(15, todayCell.date.day)
+    }
+
+    @Test
+    fun getMonthDays_returnsMultipleOfSeven() {
+        val vm = createViewModel()
+        // 任何月份，cells 数都应该是 7 的倍数
+        for (month in 1..12) {
+            val size = vm.getMonthDays(2026, month).size
+            assertEquals(0, size % 7, "Month 2026/$month size=$size not multiple of 7")
+            assertTrue(size in 28..42, "Month 2026/$month size=$size out of [28, 42]")
+        }
+    }
+}
diff --git a/shared/src/commonTest/kotlin/plus/rua/project/ShiftPatternTest.kt b/shared/src/commonTest/kotlin/plus/rua/project/ShiftPatternTest.kt
new file mode 100644
index 0000000..1958796
--- /dev/null
+++ b/shared/src/commonTest/kotlin/plus/rua/project/ShiftPatternTest.kt
@@ -0,0 +1,179 @@
+package plus.rua.project
+
+import kotlinx.datetime.LocalDate
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNull
+
+class ShiftPatternTest {
+
+    private val anchor = LocalDate(2026, 5, 15)
+    private val twoOnTwoOff = ShiftPattern(
+        anchorDate = anchor,
+        cycle = listOf(ShiftKind.WORK, ShiftKind.WORK, ShiftKind.OFF, ShiftKind.OFF)
+    )
+
+    // ---- kindAt: 锚点与同周期内 ----
+
+    @Test
+    fun kindAt_anchorDate_returnsFirstInCycle() {
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(anchor))
+    }
+
+    @Test
+    fun kindAt_oneAfterAnchor_returnsSecondInCycle() {
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 5, 16)))
+    }
+
+    @Test
+    fun kindAt_twoAfterAnchor_returnsThirdInCycle() {
+        assertEquals(ShiftKind.OFF, twoOnTwoOff.kindAt(LocalDate(2026, 5, 17)))
+    }
+
+    @Test
+    fun kindAt_threeAfterAnchor_returnsFourthInCycle() {
+        assertEquals(ShiftKind.OFF, twoOnTwoOff.kindAt(LocalDate(2026, 5, 18)))
+    }
+
+    // ---- kindAt: 周期循环 ----
+
+    @Test
+    fun kindAt_fourAfterAnchor_wrapsToCycleStart() {
+        // (5/19 - 5/15) % 4 = 0
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 5, 19)))
+    }
+
+    @Test
+    fun kindAt_eightAfterAnchor_wrapsTwice() {
+        // (5/23 - 5/15) % 4 = 0
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 5, 23)))
+    }
+
+    @Test
+    fun kindAt_oneCycleLater_idx2_returnsOff() {
+        // (5/21 - 5/15) % 4 = 2
+        assertEquals(ShiftKind.OFF, twoOnTwoOff.kindAt(LocalDate(2026, 5, 21)))
+    }
+
+    @Test
+    fun kindAt_manyCyclesLater_correctlyWraps() {
+        // 100天后: (100) % 4 = 0
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 8, 23)))
+    }
+
+    // ---- kindAt: 锚点之前的日期（负差值处理）----
+
+    @Test
+    fun kindAt_oneDayBeforeAnchor_returnsLastInCycle() {
+        // -1 mod 4 = 3 -> OFF (cycle[3])
+        assertEquals(ShiftKind.OFF, twoOnTwoOff.kindAt(LocalDate(2026, 5, 14)))
+    }
+
+    @Test
+    fun kindAt_twoDaysBeforeAnchor_returnsThirdInCycle() {
+        // -2 mod 4 = 2 -> OFF (cycle[2])
+        assertEquals(ShiftKind.OFF, twoOnTwoOff.kindAt(LocalDate(2026, 5, 13)))
+    }
+
+    @Test
+    fun kindAt_threeDaysBeforeAnchor_returnsSecondInCycle() {
+        // -3 mod 4 = 1 -> WORK (cycle[1])
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 5, 12)))
+    }
+
+    @Test
+    fun kindAt_fourDaysBeforeAnchor_returnsFirstInCycle() {
+        // -4 mod 4 = 0 -> WORK (cycle[0])
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 5, 11)))
+    }
+
+    @Test
+    fun kindAt_manyDaysBeforeAnchor_correctlyWraps() {
+        // -100 mod 4 = 0 -> WORK
+        assertEquals(ShiftKind.WORK, twoOnTwoOff.kindAt(LocalDate(2026, 2, 4)))
+    }
+
+    // ---- kindAt: 边界情况 ----
+
+    @Test
+    fun kindAt_emptyCycle_returnsNull() {
+        val pattern = ShiftPattern(anchorDate = anchor, cycle = emptyList())
+        assertNull(pattern.kindAt(anchor))
+        assertNull(pattern.kindAt(LocalDate(2026, 5, 16)))
+        assertNull(pattern.kindAt(LocalDate(2026, 5, 14)))
+    }
+
+    @Test
+    fun kindAt_singleElementCycle_alwaysReturnsThatElement() {
+        val pattern = ShiftPattern(anchorDate = anchor, cycle = listOf(ShiftKind.WORK))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(anchor))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 20)))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 1, 1)))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2027, 12, 31)))
+    }
+
+    @Test
+    fun kindAt_singleOffCycle_alwaysReturnsOff() {
+        val pattern = ShiftPattern(anchorDate = anchor, cycle = listOf(ShiftKind.OFF))
+        assertEquals(ShiftKind.OFF, pattern.kindAt(anchor))
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2030, 6, 15)))
+    }
+
+    // ---- kindAt: 多样化周期 ----
+
+    @Test
+    fun kindAt_threeOnOneOffCycle() {
+        // 4 day cycle: WORK WORK WORK OFF
+        val pattern = ShiftPattern(
+            anchorDate = anchor,
+            cycle = listOf(ShiftKind.WORK, ShiftKind.WORK, ShiftKind.WORK, ShiftKind.OFF)
+        )
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 15))) // 0
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 16))) // 1
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 17))) // 2
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 18)))  // 3
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 19))) // 0
+    }
+
+    @Test
+    fun kindAt_weekCycle_returnsCorrectDay() {
+        // 7天周期：4天上班3天休息
+        val pattern = ShiftPattern(
+            anchorDate = anchor,
+            cycle = listOf(
+                ShiftKind.WORK, ShiftKind.WORK, ShiftKind.WORK, ShiftKind.WORK,
+                ShiftKind.OFF, ShiftKind.OFF, ShiftKind.OFF
+            )
+        )
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 18))) // idx 3
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 19)))  // idx 4
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 21)))  // idx 6
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 22))) // idx 0 (next cycle)
+    }
+
+    // ---- ShiftPattern: 元数据 ----
+
+    @Test
+    fun shiftPattern_defaultNameIsChinese() {
+        val pattern = ShiftPattern(anchorDate = anchor, cycle = listOf(ShiftKind.WORK))
+        assertEquals("默认", pattern.name)
+    }
+
+    @Test
+    fun shiftPattern_customNameIsPreserved() {
+        val pattern = ShiftPattern(
+            anchorDate = anchor,
+            cycle = listOf(ShiftKind.WORK),
+            name = "夜班"
+        )
+        assertEquals("夜班", pattern.name)
+    }
+
+    @Test
+    fun shiftPattern_dataClassEquality() {
+        val a = ShiftPattern(anchor, listOf(ShiftKind.WORK, ShiftKind.OFF))
+        val b = ShiftPattern(anchor, listOf(ShiftKind.WORK, ShiftKind.OFF))
+        assertEquals(a, b)
+        assertEquals(a.hashCode(), b.hashCode())
+    }
+}
diff --git a/shared/src/commonTest/kotlin/plus/rua/project/ui/CalendarUtilsExtraTest.kt b/shared/src/commonTest/kotlin/plus/rua/project/ui/CalendarUtilsExtraTest.kt
new file mode 100644
index 0000000..cfd9f0a
--- /dev/null
+++ b/shared/src/commonTest/kotlin/plus/rua/project/ui/CalendarUtilsExtraTest.kt
@@ -0,0 +1,170 @@
+package plus.rua.project.ui
+
+import kotlinx.datetime.LocalDate
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+/**
+ * 测试 CalendarUtils 中尚未被 [CalendarUtilsTest] 覆盖的函数：
+ * - [calculateWeeksCountForPage]
+ * - [relativeDayDescription]
+ * - [formatLunarDate]
+ */
+class CalendarUtilsExtraTest {
+
+    // ---- calculateWeeksCountForPage ----
+
+    @Test
+    fun calculateWeeksCountForPage_centerPage_returnsCurrentMonthRows() {
+        // today = 2026/5/15 (May), May 2026 has 5 rows
+        val today = LocalDate(2026, 5, 15)
+        assertEquals(calculateWeeksCount(2026, 5), calculateWeeksCountForPage(START_PAGE, today))
+    }
+
+    @Test
+    fun calculateWeeksCountForPage_forwardOnePage_returnsNextMonthRows() {
+        // From May 2026, +1 -> June 2026
+        val today = LocalDate(2026, 5, 15)
+        assertEquals(
+            calculateWeeksCount(2026, 6),
+            calculateWeeksCountForPage(START_PAGE + 1, today)
+        )
+    }
+
+    @Test
+    fun calculateWeeksCountForPage_backwardOnePage_returnsPreviousMonthRows() {
+        // From May 2026, -1 -> April 2026
+        val today = LocalDate(2026, 5, 15)
+        assertEquals(
+            calculateWeeksCount(2026, 4),
+            calculateWeeksCountForPage(START_PAGE - 1, today)
+        )
+    }
+
+    @Test
+    fun calculateWeeksCountForPage_crossYearForward() {
+        // From December 2026, +1 -> January 2027
+        val today = LocalDate(2026, 12, 10)
+        assertEquals(
+            calculateWeeksCount(2027, 1),
+            calculateWeeksCountForPage(START_PAGE + 1, today)
+        )
+    }
+
+    @Test
+    fun calculateWeeksCountForPage_crossYearBackward() {
+        // From January 2026, -1 -> December 2025
+        val today = LocalDate(2026, 1, 10)
+        assertEquals(
+            calculateWeeksCount(2025, 12),
+            calculateWeeksCountForPage(START_PAGE - 1, today)
+        )
+    }
+
+    @Test
+    fun calculateWeeksCountForPage_twelvePagesForward_returnsSameMonthOfNextYear() {
+        val today = LocalDate(2026, 5, 15)
+        // +12 -> May 2027
+        assertEquals(
+            calculateWeeksCount(2027, 5),
+            calculateWeeksCountForPage(START_PAGE + 12, today)
+        )
+    }
+
+    // ---- relativeDayDescription ----
+
+    @Test
+    fun relativeDayDescription_today_returnsToday() {
+        val today = LocalDate(2026, 5, 19)
+        assertEquals("今天", relativeDayDescription(today, today))
+    }
+
+    @Test
+    fun relativeDayDescription_yesterday_returnsYesterday() {
+        val today = LocalDate(2026, 5, 19)
+        val yesterday = LocalDate(2026, 5, 18)
+        assertEquals("昨天", relativeDayDescription(yesterday, today))
+    }
+
+    @Test
+    fun relativeDayDescription_tomorrow_returnsTomorrow() {
+        val today = LocalDate(2026, 5, 19)
+        val tomorrow = LocalDate(2026, 5, 20)
+        assertEquals("明天", relativeDayDescription(tomorrow, today))
+    }
+
+    @Test
+    fun relativeDayDescription_twoDaysBefore_returnsXDaysAgo() {
+        val today = LocalDate(2026, 5, 19)
+        assertEquals("2天前", relativeDayDescription(LocalDate(2026, 5, 17), today))
+    }
+
+    @Test
+    fun relativeDayDescription_twoDaysAfter_returnsXDaysLater() {
+        val today = LocalDate(2026, 5, 19)
+        assertEquals("2天后", relativeDayDescription(LocalDate(2026, 5, 21), today))
+    }
+
+    @Test
+    fun relativeDayDescription_aWeekBefore_returnsCorrectDays() {
+        val today = LocalDate(2026, 5, 19)
+        assertEquals("7天前", relativeDayDescription(LocalDate(2026, 5, 12), today))
+    }
+
+    @Test
+    fun relativeDayDescription_thirtyDaysAfter_returnsCorrectDays() {
+        val today = LocalDate(2026, 5, 1)
+        assertEquals("30天后", relativeDayDescription(LocalDate(2026, 5, 31), today))
+    }
+
+    @Test
+    fun relativeDayDescription_crossMonthBackward_returnsCorrectDays() {
+        val today = LocalDate(2026, 5, 2)
+        assertEquals("3天前", relativeDayDescription(LocalDate(2026, 4, 29), today))
+    }
+
+    @Test
+    fun relativeDayDescription_crossYearForward_returnsCorrectDays() {
+        val today = LocalDate(2025, 12, 30)
+        assertEquals("5天后", relativeDayDescription(LocalDate(2026, 1, 4), today))
+    }
+
+    // ---- formatLunarDate ----
+
+    @Test
+    fun formatLunarDate_startsWithLunarPrefix() {
+        val result = formatLunarDate(LocalDate(2026, 5, 19))
+        assertTrue(result.startsWith("农历"), "Expected to start with '农历', got: $result")
+    }
+
+    @Test
+    fun formatLunarDate_january1_2026_returnsCorrectLunar() {
+        // 2026/1/1 公历 -> 2025年农历十一月十二
+        val result = formatLunarDate(LocalDate(2026, 1, 1))
+        assertTrue(result.startsWith("农历"), "Expected '农历' prefix, got: $result")
+        // 验证不是空字符串
+        assertTrue(result.length > 2, "Lunar date description should contain month and day")
+    }
+
+    @Test
+    fun formatLunarDate_lunarNewYear2026_returnsFirstDayOfFirstMonth() {
+        // 2026年农历正月初一 = 2026/2/17 公历
+        val result = formatLunarDate(LocalDate(2026, 2, 17))
+        assertEquals("农历正月初一", result)
+    }
+
+    @Test
+    fun formatLunarDate_anyDate_containsMonthAndDayNames() {
+        // 仅验证格式：农历 + 月 + 日
+        for (day in listOf(
+            LocalDate(2026, 3, 1),
+            LocalDate(2026, 6, 30),
+            LocalDate(2026, 12, 25)
+        )) {
+            val result = formatLunarDate(day)
+            assertTrue(result.startsWith("农历"), "Expected '农历' prefix for $day, got: $result")
+            assertTrue(result.length >= 5, "Result for $day too short: $result")
+        }
+    }
+}