diff --git a/apps/web/src/oj/learn/components/ExerciseDebug.vue b/apps/web/src/oj/learn/components/ExerciseDebug.vue
index c553500..8b5a7a1 100644
--- a/apps/web/src/oj/learn/components/ExerciseDebug.vue
+++ b/apps/web/src/oj/learn/components/ExerciseDebug.vue
@@ -101,7 +101,7 @@ function reset() {
         <span style="color: #bbb; width: 22px; text-align: right; flex-shrink: 0">
           {{ idx + 1 }}
         </span>
-        <span v-html="lineHtml[idx]" style="white-space: pre" />
+        <span v-html="lineHtml[idx]" style="white-space: pre; min-width: 0; overflow-x: auto" />
       </div>
     </n-space>
 
diff --git a/apps/web/src/oj/learn/components/ExerciseFill.vue b/apps/web/src/oj/learn/components/ExerciseFill.vue
index 1b8d305..2e7432a 100644
--- a/apps/web/src/oj/learn/components/ExerciseFill.vue
+++ b/apps/web/src/oj/learn/components/ExerciseFill.vue
@@ -96,6 +96,10 @@ function inputWidth(idx: number): string {
         v-else
         :value="userInputs[seg.index]"
         :disabled="allCorrect"
+        autocapitalize="off"
+        autocorrect="off"
+        autocomplete="off"
+        spellcheck="false"
         :style="{
           width: inputWidth(seg.index),
           fontFamily: 'var(--learn-code-font)',
diff --git a/apps/web/src/oj/learn/components/ExerciseGroup.vue b/apps/web/src/oj/learn/components/ExerciseGroup.vue
index e9d1afa..ebddaaf 100644
--- a/apps/web/src/oj/learn/components/ExerciseGroup.vue
+++ b/apps/web/src/oj/learn/components/ExerciseGroup.vue
@@ -13,12 +13,15 @@ const data = computed(() => props.exercise.data as ExerciseGroupData)
 const order = ref<number[]>([]) // item 的稳定展示顺序（初始乱序）
 const placement = ref<number[]>([]) // placement[itemIdx] = 桶下标，-1 表示在池中
 const dragIdx = ref<number | null>(null)
+// 手机上没有 HTML5 拖放（触屏不触发 dragstart），所以再给一条点选的路：先点项目、再点分组
+const pickedIdx = ref<number | null>(null)
 const submitted = ref(false)
 
 function init() {
   order.value = shuffle(data.value.items.map((_, i) => i))
   placement.value = Array(data.value.items.length).fill(-1)
   dragIdx.value = null
+  pickedIdx.value = null
   submitted.value = false
 }
 
@@ -32,6 +35,7 @@ const locked = computed(() => submitted.value && allCorrect.value)
 function onDragStart(i: number) {
   if (locked.value) return
   dragIdx.value = i
+  pickedIdx.value = null
 }
 
 function dropTo(bucket: number) {
@@ -41,6 +45,25 @@ function dropTo(bucket: number) {
   submitted.value = false
 }
 
+// 手机上分组框不大，点分组时多半点在框里已有的项目上 —— 这时算「放进它所在的分组」，
+// 只有点同一区域里的另一项才是换选
+function onItemClick(i: number) {
+  if (locked.value) return
+  const picked = pickedIdx.value
+  if (picked !== null && picked !== i && placement.value[picked] !== placement.value[i]) {
+    onAreaClick(placement.value[i])
+    return
+  }
+  pickedIdx.value = picked === i ? null : i
+}
+
+function onAreaClick(bucket: number) {
+  if (locked.value || pickedIdx.value === null) return
+  placement.value[pickedIdx.value] = bucket
+  pickedIdx.value = null
+  submitted.value = false
+}
+
 const poolItems = computed(() => order.value.filter((i) => placement.value[i] === -1))
 function itemsIn(bucket: number): number[] {
   return order.value.filter((i) => placement.value[i] === bucket)
@@ -56,6 +79,17 @@ function chipStyle(i: number): Record<string, string> {
   const color =
     status === "correct" ? "#18a058" : status === "wrong" ? "#d03050" : "var(--learn-control-line)"
   const plain = color === "var(--learn-control-line)"
+  if (pickedIdx.value === i) {
+    return {
+      padding: "5.5px 11.5px",
+      borderRadius: "6px",
+      border: "2px solid #2080f0",
+      background: "rgba(32,128,240,0.08)",
+      cursor: "pointer",
+      userSelect: "none",
+      fontSize: "15px",
+    }
+  }
   return {
     padding: "6px 12px",
     borderRadius: "6px",
@@ -86,7 +120,7 @@ function reset() {
       {{ data.question }}
     </p>
     <p style="color: var(--learn-muted); font-size: 13px; margin: 0 0 12px">
-      把下面的项目拖到对应的分组里，可在分组间拖动调整。
+      把下面的项目拖到对应的分组里，也可以先点项目、再点分组。
     </p>
 
     <div
@@ -102,6 +136,7 @@ function reset() {
       }"
       @dragover.prevent
       @drop="dropTo(-1)"
+      @click="onAreaClick(-1)"
     >
       <span v-if="poolItems.length === 0" style="color: var(--learn-muted); font-size: 13px">
         （已全部归类）
@@ -112,6 +147,7 @@ function reset() {
         draggable="true"
         :style="chipStyle(i)"
         @dragstart="onDragStart(i)"
+        @click.stop="onItemClick(i)"
       >
         {{ data.items[i] }}
       </div>
@@ -135,6 +171,7 @@ function reset() {
         }"
         @dragover.prevent
         @drop="dropTo(b)"
+        @click="onAreaClick(b)"
       >
         <p style="font-weight: 600; margin: 0 0 8px; text-align: center; font-size: 14px">
           {{ bucket }}
@@ -146,6 +183,7 @@ function reset() {
             draggable="true"
             :style="chipStyle(i)"
             @dragstart="onDragStart(i)"
+            @click.stop="onItemClick(i)"
           >
             {{ data.items[i] }}
           </div>
diff --git a/apps/web/src/oj/learn/components/ExercisePredict.vue b/apps/web/src/oj/learn/components/ExercisePredict.vue
index ee62d9b..def0911 100644
--- a/apps/web/src/oj/learn/components/ExercisePredict.vue
+++ b/apps/web/src/oj/learn/components/ExercisePredict.vue
@@ -81,6 +81,7 @@ function reset() {
       :rows="3"
       :disabled="submitted && allCorrect"
       placeholder="在这里输入程序会打印的内容"
+      :input-props="{ autocapitalize: 'off', autocorrect: 'off', spellcheck: false }"
       style="font-family: var(--learn-code-font)"
     />
 
diff --git a/apps/web/src/oj/learn/components/ExerciseSort.vue b/apps/web/src/oj/learn/components/ExerciseSort.vue
index 871ea63..bd7a9a6 100644
--- a/apps/web/src/oj/learn/components/ExerciseSort.vue
+++ b/apps/web/src/oj/learn/components/ExerciseSort.vue
@@ -24,6 +24,7 @@ function init() {
     ;[shuffled[0], shuffled[1]] = [shuffled[1], shuffled[0]]
   }
   lines.value = shuffled
+  pickedIdx.value = null
   submitted.value = false
 }
 
@@ -31,19 +32,37 @@ onMounted(init)
 watch(() => props.exercise.id, init)
 
 const dragIdx = ref<number | null>(null)
+// 手机上没有 HTML5 拖放（触屏不触发 dragstart），所以再给一条点选的路：先点一行、再点它该去的位置
+const pickedIdx = ref<number | null>(null)
 
 function onDragStart(idx: number) {
   dragIdx.value = idx
+  pickedIdx.value = null
+}
+
+function moveLine(from: number, to: number) {
+  if (from === to) return
+  const newLines = [...lines.value]
+  const [moved] = newLines.splice(from, 1)
+  newLines.splice(to, 0, moved)
+  lines.value = newLines
+  submitted.value = false
 }
 
 function onDrop(targetIdx: number) {
-  if (dragIdx.value === null || dragIdx.value === targetIdx) return
-  const newLines = [...lines.value]
-  const [moved] = newLines.splice(dragIdx.value, 1)
-  newLines.splice(targetIdx, 0, moved)
-  lines.value = newLines
+  if (dragIdx.value === null) return
+  moveLine(dragIdx.value, targetIdx)
   dragIdx.value = null
-  submitted.value = false
+}
+
+function onLineClick(idx: number) {
+  if (submitted.value && allCorrect.value) return
+  if (pickedIdx.value === null) {
+    pickedIdx.value = idx
+    return
+  }
+  moveLine(pickedIdx.value, idx)
+  pickedIdx.value = null
 }
 
 function lineStatus(idx: number): "correct" | "wrong" | "default" {
@@ -86,19 +105,24 @@ const lineHtml = computed<string[]>(() => highlightLines(data.value.lines, props
           gap: '10px',
           padding: '8px 12px',
           borderRadius: '6px',
-          border: `1.5px ${submitted ? 'solid' : 'dashed'} ${
-            lineStatus(idx) === 'correct'
-              ? '#18a058'
-              : lineStatus(idx) === 'wrong'
-                ? '#d03050'
-                : 'var(--learn-control-line)'
-          }`,
+          border:
+            pickedIdx === idx
+              ? '2px solid #2080f0'
+              : `1.5px ${submitted ? 'solid' : 'dashed'} ${
+                  lineStatus(idx) === 'correct'
+                    ? '#18a058'
+                    : lineStatus(idx) === 'wrong'
+                      ? '#d03050'
+                      : 'var(--learn-control-line)'
+                }`,
           background:
-            lineStatus(idx) === 'correct'
-              ? 'rgba(24,160,88,0.08)'
-              : lineStatus(idx) === 'wrong'
-                ? 'rgba(208,48,80,0.07)'
-                : 'transparent',
+            pickedIdx === idx
+              ? 'rgba(32,128,240,0.08)'
+              : lineStatus(idx) === 'correct'
+                ? 'rgba(24,160,88,0.08)'
+                : lineStatus(idx) === 'wrong'
+                  ? 'rgba(208,48,80,0.07)'
+                  : 'transparent',
           cursor: 'grab',
           fontFamily: 'var(--learn-code-font)',
           userSelect: 'none',
@@ -106,9 +130,13 @@ const lineHtml = computed<string[]>(() => highlightLines(data.value.lines, props
         @dragstart="onDragStart(idx)"
         @dragover.prevent
         @drop="onDrop(idx)"
+        @click="onLineClick(idx)"
       >
         <span style="color: #bbb; cursor: grab">⠿</span>
-        <span v-html="lineHtml[line.originalIdx]" style="white-space: pre" />
+        <span
+          v-html="lineHtml[line.originalIdx]"
+          style="white-space: pre; min-width: 0; overflow-x: auto"
+        />
       </div>
     </n-space>