feat: guida utente in-app e fix grafici Convertitore

- DocsPanel: pannello documentazione slide-from-right con nav a pill,
  IntersectionObserver per sezione attiva, card con step numerati e callout tip
- InfoPanel: bottone "Guida" emette open-docs invece di aprire link esterno
- App: integra DocsPanel con v-model showDocs
- Converter: fix capitalize food names (capFirst invece di text-transform),
  simmetria visiva input/output (stesso underline e font-size 1.6rem),
  rimosso CSS morto (doppio align-items, doppio background, visibility hack)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/App.vue

@@ -14,7 +14,8 @@
       </svg>
     </button>
 
-    <InfoPanel v-model="showInfo" />
+    <InfoPanel v-model="showInfo" @open-docs="showDocs = true" />
+    <DocsPanel v-model="showDocs" />
   </div>
 </template>
 
@@ -22,12 +23,14 @@
 import { ref } from 'vue'
 import BottomNav    from './components/BottomNav.vue'
 import InfoPanel    from './components/InfoPanel.vue'
+import DocsPanel    from './components/DocsPanel.vue'
 import MealPlanner  from './pages/MealPlanner.vue'
 import Converter    from './pages/Converter.vue'
 import ShoppingList from './pages/ShoppingList.vue'
 
-const page = ref('meal')
+const page     = ref('meal')
 const showInfo = ref(false)
+const showDocs = ref(false)
 </script>
 
 <style scoped>

src/components/DocsPanel.vue

@@ -0,0 +1,505 @@
+<template>
+  <Transition name="slide-right">
+    <div v-if="modelValue" class="docs-panel" role="dialog" aria-label="Guida utente">
+
+      <!-- Header sticky: back arrow + titolo centrato + spacer bilanciante -->
+      <div class="docs-header">
+        <button class="btn-back" @click="$emit('update:modelValue', false)" aria-label="Torna indietro">
+          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+            <polyline points="15 18 9 12 15 6"/>
+          </svg>
+        </button>
+        <span class="docs-title">Guida</span>
+        <!-- spacer identico al btn-back per centrare il titolo -->
+        <div aria-hidden="true" class="header-spacer" />
+      </div>
+
+      <!-- Pill nav scrollabile — IntersectionObserver aggiorna la pill attiva -->
+      <div class="section-nav" role="tablist" aria-label="Sezioni">
+        <button
+          v-for="s in sections"
+          :key="s.id"
+          :class="['nav-pill', { active: activeSection === s.id }]"
+          role="tab"
+          :aria-selected="activeSection === s.id"
+          @click="scrollToSection(s.id)"
+        >{{ s.label }}</button>
+      </div>
+
+      <!-- Contenuto scorrevole -->
+      <div class="docs-scroll" ref="scrollEl">
+
+        <!-- ── Pasti ──────────────────────────────── -->
+        <section data-section="pasti">
+          <div class="section-head">
+            <span class="section-icon" aria-hidden="true">
+              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                <rect x="3" y="4" width="18" height="18" rx="2"/>
+                <line x1="16" y1="2" x2="16" y2="6"/><line x1="8" y1="2" x2="8" y2="6"/>
+                <line x1="3" y1="10" x2="21" y2="10"/>
+              </svg>
+            </span>
+            <h2 class="section-heading">Pasti</h2>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Aggiungere un alimento</h3>
+            <ol class="steps">
+              <li>Tocca il giorno per espandere la card</li>
+              <li>Scegli il pasto: <strong>Colazione</strong>, <strong>Pranzo</strong> o <strong>Cena</strong></li>
+              <li>Scrivi il nome nel campo di testo</li>
+              <li>Premi <kbd>+</kbd> o Invio per aggiungerlo</li>
+            </ol>
+          </div>
+
+          <div class="doc-card tip">
+            <p class="tip-label" aria-hidden="true">
+              <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+                <circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12.01" y2="8"/><line x1="12" y1="12" x2="12" y2="16"/>
+              </svg>
+              Suggerimento
+            </p>
+            <p>Premi <strong>Genera lista della spesa</strong> in fondo alla pagina per importare automaticamente tutti gli alimenti della settimana, senza duplicati.</p>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Rimuovere un alimento</h3>
+            <p>Tocca il pulsante <strong>×</strong> a destra dell'elemento.</p>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Salvataggio automatico</h3>
+            <p>I dati vengono salvati automaticamente sul dispositivo. Non serve premere nessun tasto.</p>
+          </div>
+        </section>
+
+        <!-- ── Converti ───────────────────────────── -->
+        <section data-section="converti">
+          <div class="section-head">
+            <span class="section-icon" aria-hidden="true">
+              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                <polyline points="17 1 21 5 17 9"/>
+                <path d="M3 11V9a4 4 0 014-4h14"/>
+                <polyline points="7 23 3 19 7 15"/>
+                <path d="M21 13v2a4 4 0 01-4 4H3"/>
+              </svg>
+            </span>
+            <h2 class="section-heading">Converti</h2>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Come usarlo</h3>
+            <ol class="steps">
+              <li>Cerca l'alimento nel campo (es. <em>pollo</em>, <em>riso</em>)</li>
+              <li>Seleziona il metodo di cottura dall'elenco</li>
+              <li>Inserisci il peso in grammi</li>
+              <li>Il risultato appare in tempo reale</li>
+              <li>Premi <strong>⇄</strong> per invertire crudo ↔ cotto</li>
+            </ol>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Alimenti disponibili</h3>
+            <div class="category-table" role="list">
+              <div class="cat-row" v-for="cat in categories" :key="cat.label" role="listitem">
+                <span class="cat-label">{{ cat.label }}</span>
+                <span class="cat-items">{{ cat.items }}</span>
+              </div>
+            </div>
+            <div class="methods-row" aria-label="Metodi di cottura disponibili">
+              <span class="method-chip" v-for="m in cookingMethods" :key="m">{{ m }}</span>
+            </div>
+          </div>
+        </section>
+
+        <!-- ── Spesa ──────────────────────────────── -->
+        <section data-section="spesa">
+          <div class="section-head">
+            <span class="section-icon" aria-hidden="true">
+              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                <path d="M6 2L3 6v14a2 2 0 002 2h14a2 2 0 002-2V6l-3-4z"/>
+                <line x1="3" y1="6" x2="21" y2="6"/>
+                <path d="M16 10a4 4 0 01-8 0"/>
+              </svg>
+            </span>
+            <h2 class="section-heading">Spesa</h2>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Aggiungere un elemento</h3>
+            <p>Scrivi il nome nel campo in alto e premi <kbd>+</kbd> o Invio.</p>
+          </div>
+
+          <div class="doc-card tip">
+            <p class="tip-label" aria-hidden="true">
+              <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+                <circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12.01" y2="8"/><line x1="12" y1="12" x2="12" y2="16"/>
+              </svg>
+              Suggerimento
+            </p>
+            <p>Vai alla tab <strong>Pasti</strong> e premi <strong>Genera lista della spesa</strong> per importare automaticamente gli alimenti pianificati.</p>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Spuntare un elemento</h3>
+            <p>Tocca la casella a sinistra. Gli elementi completati vengono spostati in una sezione separata con testo barrato.</p>
+          </div>
+
+          <div class="doc-card">
+            <h3 class="card-title">Rimuovere / svuotare</h3>
+            <p>Tocca <strong>×</strong> per rimuovere un elemento singolo, oppure <strong>Svuota lista</strong> in fondo per eliminare tutto (richiede conferma).</p>
+          </div>
+        </section>
+
+        <div class="docs-footer">BitePlan · v{{ version }} · Davide Grilli</div>
+
+      </div>
+    </div>
+  </Transition>
+</template>
+
+<script setup>
+import { ref, watch, nextTick, onUnmounted } from 'vue'
+import pkg from '../../package.json'
+
+const props = defineProps({ modelValue: Boolean })
+defineEmits(['update:modelValue'])
+
+const version = pkg.version
+const scrollEl = ref(null)
+const activeSection = ref('pasti')
+let observer = null
+
+const sections = [
+  { id: 'pasti',    label: 'Pasti'    },
+  { id: 'converti', label: 'Converti' },
+  { id: 'spesa',    label: 'Spesa'    },
+]
+
+const categories = [
+  { label: 'Cereali e pasta', items: 'Riso (4 varietà), pasta, farro, orzo, quinoa, cous cous' },
+  { label: 'Legumi secchi',   items: 'Ceci, fagioli, lenticchie' },
+  { label: 'Verdure',         items: 'Carote, zucchine, patate, spinaci, broccoli, asparagi e altri' },
+  { label: 'Carni',           items: 'Pollo petto, tacchino fesa, hamburger, vitello' },
+  { label: 'Pesce',           items: 'Tonno, merluzzo, spigola, sogliola' },
+  { label: 'Uova',            items: 'Uovo al tegamino, frittata' },
+]
+
+const cookingMethods = ['Bollitura', 'Padella', 'Forno', 'Friggitrice ad aria']
+
+watch(() => props.modelValue, async (open) => {
+  if (open) {
+    await nextTick()
+    setupObserver()
+    activeSection.value = 'pasti'
+    scrollEl.value?.scrollTo({ top: 0 })
+  } else {
+    observer?.disconnect()
+    observer = null
+  }
+})
+
+function setupObserver() {
+  if (!scrollEl.value) return
+  observer?.disconnect()
+  // rootMargin: entra in zona attiva quando la sezione raggiunge il 20% dall'alto del container
+  observer = new IntersectionObserver(
+    (entries) => {
+      const visible = entries.filter(e => e.isIntersecting)
+      if (visible.length) activeSection.value = visible[0].target.dataset.section
+    },
+    { root: scrollEl.value, rootMargin: '0px 0px -65% 0px', threshold: 0 }
+  )
+  scrollEl.value.querySelectorAll('[data-section]').forEach(el => observer.observe(el))
+}
+
+function scrollToSection(id) {
+  const el = scrollEl.value?.querySelector(`[data-section="${id}"]`)
+  if (el) el.scrollIntoView({ behavior: 'smooth', block: 'start' })
+}
+
+onUnmounted(() => observer?.disconnect())
+</script>
+
+<style scoped>
+/* ── Panel container ─────────────────────────── */
+.docs-panel {
+  position: fixed;
+  inset: 0;
+  max-width: 480px;
+  margin: 0 auto;
+  background: var(--color-bg);
+  z-index: 300;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+/* ── Animazione slide da destra ──────────────── */
+/* enter ease-out: risposta immediata, decelera all'arrivo (feel nativo) */
+.slide-right-enter-active { transition: transform 320ms cubic-bezier(0.25, 1, 0.5, 1); }
+/* leave ease-in: parte lentamente, accelera — chiusura decisa */
+.slide-right-leave-active { transition: transform 240ms cubic-bezier(0.55, 0, 1, 0.45); }
+.slide-right-enter-from,
+.slide-right-leave-to     { transform: translateX(100%); }
+
+/* ── Header ──────────────────────────────────── */
+.docs-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  /* safe-area-inset-top: evita sovrapposizione con status bar su iOS */
+  padding: calc(env(safe-area-inset-top, 0px) + 10px) 8px 10px;
+  background: var(--color-surface);
+  border-bottom: 1px solid var(--color-border);
+  flex-shrink: 0;
+}
+
+.btn-back {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 44px;
+  min-width: 44px;
+  background: none;
+  color: var(--color-primary);
+  border-radius: var(--radius-sm);
+  padding: 0;
+  transition: background var(--transition);
+}
+
+.btn-back:active {
+  background: var(--color-primary-muted);
+  opacity: 1;
+}
+
+.docs-title {
+  font-size: 1rem;
+  font-weight: 700;
+  color: var(--color-text);
+  letter-spacing: -0.01em;
+}
+
+/* spacer uguale al btn-back per centrare il titolo otticamente */
+.header-spacer { width: 44px; }
+
+/* ── Navigazione sezioni (pill) ──────────────── */
+.section-nav {
+  display: flex;
+  gap: 6px;
+  padding: 10px 16px;
+  overflow-x: auto;
+  scrollbar-width: none;
+  background: var(--color-surface);
+  border-bottom: 1px solid var(--color-border);
+  flex-shrink: 0;
+}
+
+.section-nav::-webkit-scrollbar { display: none; }
+
+.nav-pill {
+  flex-shrink: 0;
+  font-size: 0.85rem;
+  font-weight: 600;
+  padding: 0 14px;
+  min-height: 32px;
+  border-radius: var(--radius-full);
+  background: var(--color-bg);
+  color: var(--color-muted);
+  border: 1px solid var(--color-border);
+  transition: background var(--transition), color var(--transition), border-color var(--transition);
+}
+
+.nav-pill.active {
+  background: var(--color-primary);
+  color: #fff;
+  border-color: var(--color-primary);
+}
+
+/* ── Scroll container ────────────────────────── */
+.docs-scroll {
+  flex: 1;
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+  padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 40px);
+}
+
+/* ── Section header ──────────────────────────── */
+section { padding-top: 4px; }
+section + section { margin-top: 8px; }
+
+.section-head {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 24px 16px 10px;
+}
+
+.section-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  /* quadratino con sfondo primario muted — identifica visivamente la sezione */
+  background: var(--color-primary-muted);
+  border-radius: var(--radius-sm);
+  color: var(--color-primary);
+  flex-shrink: 0;
+}
+
+.section-heading {
+  font-size: 1.1rem;
+  font-weight: 800;
+  letter-spacing: -0.02em;
+  color: var(--color-text);
+}
+
+/* ── Card contenuto ──────────────────────────── */
+.doc-card {
+  margin: 0 16px 8px;
+  background: var(--color-surface);
+  border-radius: var(--radius);
+  padding: 14px 16px;
+  border: 1px solid var(--color-border);
+  box-shadow: var(--shadow-sm);
+  font-size: 0.9rem;
+  line-height: 1.55;
+  color: var(--color-text);
+}
+
+.card-title {
+  font-size: 0.82rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  color: var(--color-muted);
+  margin-bottom: 8px;
+}
+
+/* ── Card tip / suggerimento ─────────────────── */
+/* border-left accent: segnala contenuto accessorio senza competere con le card */
+.doc-card.tip {
+  background: var(--color-primary-muted);
+  border-color: transparent;
+  border-left: 3px solid var(--color-primary);
+  box-shadow: none;
+}
+
+.tip-label {
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  font-size: 0.72rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.07em;
+  color: var(--color-primary);
+  margin-bottom: 6px;
+}
+
+/* ── Lista numerata con badge ────────────────── */
+/* counter CSS invece di <span> inline: mantiene semantica <ol> accessibile */
+.steps {
+  list-style: none;
+  counter-reset: steps;
+  display: flex;
+  flex-direction: column;
+  gap: 9px;
+  margin-top: 8px;
+}
+
+.steps li {
+  counter-increment: steps;
+  display: flex;
+  align-items: flex-start;
+  gap: 10px;
+  font-size: 0.9rem;
+  line-height: 1.5;
+}
+
+.steps li::before {
+  content: counter(steps);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 22px;
+  height: 22px;
+  background: var(--color-primary);
+  color: #fff;
+  border-radius: 50%;
+  font-size: 0.7rem;
+  font-weight: 700;
+  flex-shrink: 0;
+  margin-top: 2px;
+}
+
+/* ── Kbd inline ──────────────────────────────── */
+kbd {
+  display: inline-flex;
+  align-items: center;
+  padding: 1px 7px;
+  background: var(--color-bg);
+  border: 1px solid var(--color-border);
+  border-radius: 5px;
+  font-family: inherit;
+  font-size: 0.85em;
+  font-weight: 600;
+  color: var(--color-text);
+}
+
+/* ── Tabella categorie alimenti ──────────────── */
+.category-table {
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  overflow: hidden;
+  margin-top: 10px;
+}
+
+.cat-row {
+  display: flex;
+  align-items: baseline;
+  gap: 8px;
+  padding: 9px 12px;
+  border-bottom: 1px solid var(--color-border);
+  font-size: 0.86rem;
+}
+
+.cat-row:last-child { border-bottom: none; }
+
+.cat-label {
+  font-weight: 600;
+  color: var(--color-text);
+  flex-shrink: 0;
+  min-width: 110px;
+}
+
+.cat-items { color: var(--color-muted); font-size: 0.82rem; }
+
+/* ── Chip metodi cottura ─────────────────────── */
+.methods-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-top: 12px;
+}
+
+.method-chip {
+  font-size: 0.78rem;
+  font-weight: 600;
+  padding: 3px 10px;
+  background: var(--color-bg);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-full);
+  color: var(--color-muted);
+}
+
+/* ── Footer ──────────────────────────────────── */
+.docs-footer {
+  margin: 24px 16px 0;
+  text-align: center;
+  font-size: 0.78rem;
+  color: var(--color-muted);
+  opacity: 0.6;
+}
+</style>

src/components/InfoPanel.vue

@@ -32,16 +32,15 @@
           <span class="info-label">Licenza</span>
           <span class="info-value">EUPL v1.2</span>
         </div>
-        <div class="info-row">
-          <span class="info-label">Documentazione</span>
-          <a class="info-link" href="https://docs.biteplan.example.com" target="_blank" rel="noopener">
+        <button class="info-row info-row--btn" @click="$emit('open-docs')" aria-label="Apri guida">
+          <span class="info-label">Guida</span>
+          <span class="info-link">
             Apri
-            <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
-              <path d="M18 13v6a2 2 0 01-2 2H5a2 2 0 01-2-2V8a2 2 0 012-2h6"/>
-              <polyline points="15 3 21 3 21 9"/><line x1="10" y1="14" x2="21" y2="3"/>
+            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
+              <polyline points="9 18 15 12 9 6"/>
             </svg>
-          </a>
-        </div>
+          </span>
+        </button>
       </div>
 
     </div>
@@ -52,7 +51,7 @@
 import pkg from '../../package.json'
 import appIcon from '../../assets/icon-only.png'
 defineProps({ modelValue: Boolean })
-defineEmits(['update:modelValue'])
+defineEmits(['update:modelValue', 'open-docs'])
 const version = pkg.version
 </script>
 
@@ -150,6 +149,16 @@ const version = pkg.version
 
 .info-row:last-child { border-bottom: none; }
 
+/* riga cliccabile: reset button, mantiene layout identico alle righe statiche */
+.info-row--btn {
+  width: 100%;
+  min-height: unset;
+  border-radius: 0;
+  background: var(--color-surface);
+  text-align: left;
+}
+.info-row--btn:active { background: var(--color-bg); opacity: 1; }
+
 .info-label {
   font-size: 0.9rem;
   color: var(--color-text);

src/pages/Converter.vue

@@ -27,7 +27,7 @@
           class="result-item"
           @click="selectItem(r)"
         >
-          <span class="result-food">{{ r.food }}</span>
+          <span class="result-food">{{ capFirst(r.food) }}</span>
           <span class="result-method">{{ capFirst(r.method) }}</span>
         </li>
       </ul>
@@ -37,7 +37,7 @@
     <div v-if="selected" class="converter-card">
       <div class="card-top">
         <div class="food-info">
-          <span class="food-name">{{ selected.food }}</span>
+          <span class="food-name">{{ capFirst(selected.food) }}</span>
           <span class="food-sep">·</span>
           <span class="food-method">{{ capFirst(selected.method) }}</span>
         </div>
@@ -64,7 +64,7 @@
           </div>
         </div>
 
-        <button class="btn-swap" @click="swapDirection" :title="direction === 'rawToCooked' ? 'Inverti direzione' : 'Inverti direzione'">
+        <button class="btn-swap" @click="swapDirection" aria-label="Inverti direzione">
           <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
             <polyline points="17 1 21 5 17 9"/>
             <path d="M3 11V9a4 4 0 014-4h14"/>
@@ -73,12 +73,12 @@
           </svg>
         </button>
 
-        <div class="calc-side output-side" :class="{ 'has-result': result !== null }">
+        <div class="calc-side output-side">
           <div class="calc-label">{{ direction === 'rawToCooked' ? 'cotto' : 'crudo' }}</div>
           <div class="calc-output">
             <span v-if="result !== null" class="output-value">{{ result }}</span>
             <span v-else class="output-placeholder">—</span>
-            <span class="calc-unit" :class="{ visible: result !== null }">g</span>
+            <span v-if="result !== null" class="calc-unit">g</span>
           </div>
         </div>
       </div>
@@ -206,7 +206,7 @@ function swapDirection() {
 
 .result-item:last-child { border-bottom: none; }
 .result-item:active { background: var(--color-bg); }
-.result-food { font-weight: 600; text-transform: capitalize; }
+.result-food { font-weight: 600; }
 .result-method { font-size: 0.85rem; color: var(--color-muted); }
 
 /* ── converter card ───────────────────────────────── */
@@ -231,12 +231,11 @@ function swapDirection() {
   gap: 6px;
 }
 
-.food-name { font-weight: 700; font-size: 1rem; text-transform: capitalize; }
+.food-name { font-weight: 700; font-size: 1rem; }
 .food-sep  { color: var(--color-border); font-size: 1.1rem; }
 .food-method { font-size: 0.9rem; color: var(--color-muted); }
 
 .btn-reset {
-  background: none;
   color: var(--color-primary);
   font-size: 0.85rem;
   font-weight: 600;
@@ -284,7 +283,7 @@ function swapDirection() {
 
 /* override globale per input dentro la card */
 .calc-input {
-  font-size: 1.5rem;
+  font-size: 1.6rem;
   font-weight: 700;
   letter-spacing: -0.02em;
   border: none;
@@ -308,6 +307,8 @@ function swapDirection() {
   font-size: 1rem;
   font-weight: 600;
   color: var(--color-muted);
+  align-self: flex-end;
+  padding-bottom: 6px;
 }
 
 /* bottone swap centrale */
@@ -332,33 +333,31 @@ function swapDirection() {
   opacity: 1;
 }
 
-/* colonna output */
-.output-side .calc-output {
+/* colonna output: underline visivo per simmetria con il lato input */
+.calc-output {
   display: flex;
-  align-items: baseline;
+  align-items: center;
   gap: 4px;
   min-height: 44px;
-  align-items: center;
+  border-bottom: 2px solid var(--color-border);
+  padding-bottom: 4px;
 }
 
 .output-value {
-  font-size: 2rem;
+  font-size: 1.6rem;
   font-weight: 800;
   letter-spacing: -0.03em;
   color: var(--color-primary);
+  line-height: 1;
 }
 
 .output-placeholder {
-  font-size: 2rem;
+  font-size: 1.6rem;
   font-weight: 300;
   color: var(--color-border);
+  line-height: 1;
 }
 
-/* nasconde "g" finché non c'è un risultato */
-.calc-unit { visibility: hidden; }
-.calc-input-wrap .calc-unit,
-.has-result .calc-unit { visibility: visible; }
-
 /* ── footer card ─────────────────────────────────── */
 .card-footer {
   padding: 10px 16px 14px;