diff --git a/assets/main.scss b/assets/main.scss
index c1216e5..7df4a75 100644
--- a/assets/main.scss
+++ b/assets/main.scss
@@ -10,6 +10,7 @@ body {
 
 .container {
     @apply max-w-7xl mx-auto px-4 grid grid-cols-12 items-center;
+
     &.min-w-full {
         @apply px-0;
     }
@@ -92,7 +93,6 @@ a[href^="#"] {
 
     &-image {
         @apply col-span-full xl:col-span-4 flex justify-center items-center;
-        min-height: 50vh;
     }
 }
 
@@ -129,7 +129,7 @@ label {
 }
 
 input {
-    @apply bg-gray-50 border border-gray-300 text-gray-900 rounded focus:ring-blue-500 focus:border-blue-500 text-lg p-2.5 dark:bg-gray-700 dark:border-gray-600 dark:placeholder-gray-400 dark:text-white dark:focus:ring-blue-500 dark:focus:border-blue-500 disabled:bg-neutral disabled:cursor-not-allowed;
+    @apply bg-gray-50 border border-gray-300 text-gray-900 rounded focus:ring-blue-500 focus:border-blue-500 text-lg p-2.5 dark:bg-gray-700 dark:border-gray-600 dark:placeholder-gray-400 dark:text-white dark:focus:ring-blue-500 dark:focus:border-blue-500 disabled:bg-neutral disabled:cursor-not-allowed invalid:border-pink-500 invalid:text-pink-600 focus:invalid:border-pink-500 focus:invalid:ring-pink-500;
 }
 
 textarea {
diff --git a/components/calcModels.vue b/components/calcModels.vue
index e4fabdb..6e30f6e 100644
--- a/components/calcModels.vue
+++ b/components/calcModels.vue
@@ -34,7 +34,7 @@ const { hasFinishLoading, progress, items } = await useProgress()
             <Suspense>
                 <ModelParametric />
             </Suspense>
-            <TresDirectionalLight :position="[70, 60, 70]" :intensity="10" color="#fdf5ca" cast-shadow />
+            <TresDirectionalLight :position="[80, 70, 60]" :intensity="10" color="#fdf5ca" cast-shadow />
         </TresCanvas>
     </div>
 </template>
diff --git a/components/calcValues.vue b/components/calcValues.vue
index 66645f2..6b8f8d4 100644
--- a/components/calcValues.vue
+++ b/components/calcValues.vue
@@ -6,34 +6,46 @@ const lamelle_color = useState('lamelle_color', () => '#C2B078')
 
 const parametric = {
     length: {
-        min: 100,
+        min: 400,
         max: 2400,
-        step: 10,
+        step: 50,
     },
     total_length: {
-        min: 0.1,
-        step: 0.1,
+        min: 0.4,
+        step: 0.05,
     },
     height: {
-        min: 220,
+        min: 675,
         max: 2400,
         step: 115,
     }
 }
 const form_state = reactive({
     length: fence_section.value * 1000,
-    height: lamelles_count.value * parametric.height.step,
+    fence_length: 100,
+    height: 100 + lamelles_count.value * parametric.height.step,
     total_length: fence_section.value,
     total_length_mm: fence_section.value * 1000,
     full_sections: 1,
     extra_section: 0
 })
+const form_errors = reactive({
+    length: false,
+    height: false,
+    total_length: false,
+})
+const form_refs = {
+    length: ref(),
+    height: ref(),
+    total_length: ref(),
+}
 const auto_section_width = ref<boolean>(false)
 
 const changeParametres = () => {
     const lamelles = Math.floor(form_state.height / parametric.height.step)
     lamelles_count.value = lamelles
     fence_section.value = form_state.length * 0.001
+
     for (const key in form_state) {
         if (parametric.hasOwnProperty(key) && parametric[key].max) {
             if (form_state[key] > parametric[key].max) {
@@ -46,30 +58,31 @@ const changeParametres = () => {
             }
         }
     }
+
     form_state.total_length_mm = form_state.total_length * 1000
     if (auto_section_width.value) {
-        // form_state.length
-        // if (form_state.total_length_mm % form_state.length) {
         let w = parametric.length.max
         while (((form_state.total_length_mm % w) > 0) && w > (parametric.length.min + parametric.length.step * 10)) {
             w -= parametric.length.step
         }
         form_state.length = w
-        // }
-
     }
     if (form_state.total_length_mm < form_state.length) {
         form_state.length = form_state.total_length_mm
     }
-    form_state.full_sections = Math.ceil(form_state.total_length_mm / form_state.length)
-    if (form_state.total_length_mm % form_state.length) {
-        form_state.extra_section = (form_state.total_length_mm % form_state.length).toFixed(0)
+
+    const t_f = (form_state.total_length_mm - form_state.fence_length)
+    const i_f = (form_state.length - form_state.fence_length)
+    form_state.full_sections = Math.floor(t_f / i_f)
+    if (t_f % i_f) {
+        form_state.extra_section = Math.round(t_f % i_f)
     } else {
         form_state.extra_section = 0
     }
 
-    if (form_state.extra_section < parametric.length.min) {
-        console.log('eh')
+    form_refs.total_length.value.setCustomValidity('')
+    if (form_state.extra_section && form_state.extra_section < parametric.length.min) {
+        form_refs.total_length.value.setCustomValidity('Расчет невозможен')
     }
 }
 
@@ -100,6 +113,7 @@ const autoSectionWidth = () => {
 const predefLamelleColors = ['#474B4E', '#705335', '#FDF4E3', '#2F4538']
 const predefPillarColors = ['#474B4E', '#6A5D4D', '#F4F4F4', '#2F4538']
 
+watch(form_state, changeParametres, { deep: true })
 watch(form_state, changeParametres, { deep: true })
 
 const calc_text = computed(() => {
@@ -124,7 +138,7 @@ const toggleModal = () => {
                     <Icon type="button" @click="increment('length', -1)" name="mdi:minus-circle-outline"
                         :class="auto_section_width ? `disabled` : ''" />
                     <input id="length" type="number" v-bind="parametric.length" v-model="form_state.length"
-                        :disabled="auto_section_width" />
+                        :disabled="auto_section_width" :ref="form_refs.length" />
                     <Icon type="button" @click="increment('length', 1)" name="mdi:plus-circle-outline"
                         :class="auto_section_width ? `disabled` : ''" />
                     <Icon name="mdi:calculator-variant" @click="autoSectionWidth" />
@@ -132,7 +146,8 @@ const toggleModal = () => {
                 <div class="form-item">
                     <label for="height">Высота забора, мм</label>
                     <Icon type="button" @click="increment('height', -1)" name="mdi:minus-circle-outline" />
-                    <input id="height" type="number" v-bind="parametric.height" v-model="form_state.height" />
+                    <input id="height" type="number" v-bind="parametric.height" v-model="form_state.height"
+                        :ref="form_refs.height" />
                     <Icon type="button" @click="increment('height', 1)" name="mdi:plus-circle-outline" />
                 </div>
             </div>
@@ -160,7 +175,7 @@ const toggleModal = () => {
                     <label for="total_length">Общая длина забора, м</label>
                     <Icon type="button" @click="increment('total_length', -1)" name="mdi:minus-circle-outline" />
                     <input type="number" id="total_length" v-bind="parametric.total_length"
-                        v-model="form_state.total_length" />
+                        v-model="form_state.total_length" :ref="form_refs.total_length" />
                     <Icon type="button" @click="increment('total_length', 1)" name="mdi:plus-circle-outline" />
                 </div>
                 <div class="form-item grow">
@@ -169,9 +184,8 @@ const toggleModal = () => {
                 </div>
             </div>
             <p>
-                <button class="not-prose" @click="toggleModal">Купить прямо сейчас</button>
+                <button @click="toggleModal">Купить прямо сейчас</button>
             </p>
-
         </form>
     </div>
 </template>
\ No newline at end of file