diff --git a/src/components/AppNumberInput.vue b/src/components/AppNumberInput.vue
new file mode 100644
index 0000000..bc1c0bf
--- /dev/null
+++ b/src/components/AppNumberInput.vue
@@ -0,0 +1,135 @@
+<script setup lang="ts">
+import { ref, computed } from 'vue'
+import { Minus, Plus } from 'lucide-vue-next'
+
+interface Props {
+  modelValue: number
+  min?: number
+  max?: number
+  step?: number
+  precision?: number
+  prefix?: string
+  suffix?: string
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  min: 0,
+  max: Infinity,
+  step: 1,
+  precision: 0,
+  prefix: '',
+  suffix: '',
+})
+
+const emit = defineEmits<{
+  'update:modelValue': [value: number]
+}>()
+
+const isEditing = ref(false)
+const editValue = ref('')
+const inputRef = ref<HTMLInputElement | null>(null)
+
+const displayValue = computed(() => {
+  return props.modelValue.toFixed(props.precision)
+})
+
+function setValue(val: number) {
+  const clamped = Math.min(props.max, Math.max(props.min, val))
+  const rounded = parseFloat(clamped.toFixed(props.precision))
+  emit('update:modelValue', rounded)
+}
+
+function increment() {
+  setValue(props.modelValue + props.step)
+}
+
+function decrement() {
+  setValue(props.modelValue - props.step)
+}
+
+// ── Press-and-hold ───────────────────────────────────────────────
+let holdTimeout: ReturnType<typeof setTimeout> | null = null
+let holdInterval: ReturnType<typeof setInterval> | null = null
+
+function startHold(action: () => void) {
+  action()
+  holdTimeout = setTimeout(() => {
+    holdInterval = setInterval(action, 80)
+  }, 400)
+}
+
+function stopHold() {
+  if (holdTimeout) { clearTimeout(holdTimeout); holdTimeout = null }
+  if (holdInterval) { clearInterval(holdInterval); holdInterval = null }
+}
+
+// ── Inline editing ───────────────────────────────────────────────
+function startEdit() {
+  isEditing.value = true
+  editValue.value = displayValue.value
+  setTimeout(() => inputRef.value?.select(), 0)
+}
+
+function commitEdit() {
+  isEditing.value = false
+  const parsed = parseFloat(editValue.value)
+  if (!isNaN(parsed)) {
+    setValue(parsed)
+  }
+}
+
+function cancelEdit() {
+  isEditing.value = false
+}
+</script>
+
+<template>
+  <div class="flex items-center gap-2">
+    <button
+      type="button"
+      @mousedown.prevent="startHold(decrement)"
+      @mouseup="stopHold"
+      @mouseleave="stopHold"
+      @touchstart.prevent="startHold(decrement)"
+      @touchend="stopHold"
+      class="w-8 h-8 flex items-center justify-center border border-border-visible rounded-lg text-text-secondary hover:text-text-primary hover:bg-bg-elevated transition-colors disabled:opacity-40 disabled:cursor-not-allowed shrink-0"
+      :disabled="modelValue <= min"
+    >
+      <Minus class="w-3.5 h-3.5" :stroke-width="2" />
+    </button>
+
+    <div
+      v-if="!isEditing"
+      @click="startEdit"
+      class="min-w-[4rem] text-center text-[0.8125rem] font-mono text-text-primary cursor-text select-none"
+    >
+      <span v-if="prefix" class="text-text-tertiary">{{ prefix }}</span>
+      {{ displayValue }}
+      <span v-if="suffix" class="text-text-tertiary ml-0.5">{{ suffix }}</span>
+    </div>
+    <input
+      v-else
+      ref="inputRef"
+      v-model="editValue"
+      type="text"
+      inputmode="decimal"
+      class="w-20 text-center px-1 py-0.5 bg-bg-inset border border-accent rounded-lg text-[0.8125rem] font-mono text-text-primary focus:outline-none"
+      @blur="commitEdit"
+      @keydown.enter="commitEdit"
+      @keydown.escape="cancelEdit"
+    />
+
+    <button
+      type="button"
+      @mousedown.prevent="startHold(increment)"
+      @mouseup="stopHold"
+      @mouseleave="stopHold"
+      @touchstart.prevent="startHold(increment)"
+      @touchend="stopHold"
+      class="w-8 h-8 flex items-center justify-center border border-border-visible rounded-lg text-text-secondary hover:text-text-primary hover:bg-bg-elevated transition-colors disabled:opacity-40 disabled:cursor-not-allowed shrink-0"
+      :disabled="modelValue >= max"
+    >
+      <Plus class="w-3.5 h-3.5" :stroke-width="2" />
+    </button>
+  </div>
+</template>