rewrite checkbox component as non-functional

src/components/checkbox/checkbox.vue

@@ -0,0 +1,63 @@
+<template>
+  <label class="checkbox">
+    <input type="checkbox" :checked="value" @change="$emit('input', $event.target.checked)">
+    <i class="checkbox-indicator" />
+    <span><slot></slot></span>
+  </label>
+</template>
+
+<script>
+export default {
+  props: ['value']
+}
+</script>
+
+<style lang="scss">
+.checkbox {
+  position: relative;
+  display: inline-block;
+  padding-left: 1.2em;
+  min-height: 1.2em;
+
+  &-indicator::before {
+    position: absolute;
+    left: 0;
+    top: 0;
+    display: block;
+    content: '✔';
+    transition: color 200ms;
+    width: 1.1em;
+    height: 1.1em;
+    border-radius: $fallback--checkboxRadius;
+    border-radius: var(--checkboxRadius, $fallback--checkboxRadius);
+    box-shadow: 0px 0px 2px black inset;
+    box-shadow: var(--inputShadow);
+    background-color: $fallback--fg;
+    background-color: var(--input, $fallback--fg);
+    vertical-align: top;
+    text-align: center;
+    line-height: 1.1em;
+    font-size: 1.1em;
+    color: transparent;
+    overflow: hidden;
+    box-sizing: border-box;
+  }
+
+  input[type=checkbox] {
+    display: none;
+
+    &:checked + .checkbox-indicator::before {
+      color: $fallback--text;
+      color: var(--text, $fallback--text);
+    }
+
+    &:disabled + .checkbox-indicator::before {
+      opacity: .5;
+    }
+  }
+
+  & > span {
+    margin-left: .5em;
+  }
+}
+</style>