/* =========================================================================
   Calcolatore ROI M2D — palette derivata da www.m2d.tech
   Nero/antracite + bianco come base, arancio come unico accento di brand.
   ========================================================================= */
:root {
  --m2d-black: #121212;
  --m2d-black-soft: #1c1c1c;
  --m2d-header: #252b2d;
  --m2d-border-dark: #333333;
  --m2d-white: #ffffff;
  --m2d-gray-100: #f6f6f7;
  --m2d-gray-200: #e7e7e7;
  --m2d-gray-400: #aaaaaa;
  --m2d-gray-600: #888888;
  --m2d-gray-800: #333333;
  --m2d-orange: #ff600a;
  --m2d-orange-hover: #e0560c;
  --m2d-orange-soft: rgba(255, 96, 10, 0.1);
  --m2d-orange-soft-strong: rgba(255, 96, 10, 0.18);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Courier New", Courier, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--m2d-gray-100);
  color: var(--m2d-gray-800);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p { margin: 0; }

button, input, select {
  font-family: inherit;
  font-size: inherit;
}

a { color: var(--m2d-orange); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

/* ---------------------------------------------------------------------
   Masthead — logo di brand, scorre normalmente (non sticky)
   --------------------------------------------------------------------- */
.masthead {
  background: var(--m2d-black);
  padding: 18px 24px;
}

.masthead__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.masthead__logo {
  height: 40px;
  width: auto;
  display: block;
}

.lang-switch {
  color: var(--m2d-gray-400);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid var(--m2d-border-dark);
  border-radius: var(--radius-sm);
}

.lang-switch:hover {
  color: var(--m2d-white);
  border-color: var(--m2d-gray-400);
}

/* ---------------------------------------------------------------------
   Bottoni
   --------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.05s ease;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--m2d-orange);
  color: var(--m2d-white);
  box-shadow: 0 4px 16px rgba(255, 96, 10, 0.35);
}

.btn--primary:hover { background: var(--m2d-orange-hover); }
.btn--primary:disabled {
  background: var(--m2d-gray-400);
  box-shadow: none;
  cursor: not-allowed;
}

.btn--block { width: 100%; }

/* ---------------------------------------------------------------------
   Hero — finitura "vetrina"
   --------------------------------------------------------------------- */
.hero {
  background: linear-gradient(180deg, var(--m2d-black) 0%, var(--m2d-black-soft) 100%);
  color: var(--m2d-white);
  padding: 56px 24px 64px;
}

.hero__inner {
  max-width: 1100px;
  margin: 0 auto;
}

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--m2d-orange);
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  max-width: 720px;
  margin-bottom: 18px;
}

.hero__lead {
  font-size: 17px;
  color: var(--m2d-gray-400);
  max-width: 640px;
}

.hero__lead em {
  color: var(--m2d-white);
  font-style: italic;
}

/* ---------------------------------------------------------------------
   Layout principale a due colonne
   --------------------------------------------------------------------- */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 96px;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 32px;
  align-items: start;
}

.calc-col { min-width: 0; }

.cockpit-col {
  position: sticky;
  top: 76px;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .cockpit-col { position: static; order: -1; margin-bottom: 8px; }
}

.step { margin-bottom: 40px; }

.step__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 6px;
}

.step h2 {
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.step__num {
  font-size: 14px;
  font-weight: 800;
  color: var(--m2d-gray-400);
}

.step__hint {
  color: var(--m2d-gray-600);
  font-size: 14px;
  margin: 6px 0 18px;
}

/* ---------------------------------------------------------------------
   01 — Griglia scenari
   --------------------------------------------------------------------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (max-width: 540px) {
  .scenario-grid { grid-template-columns: 1fr; }
}

.scenario-card {
  position: relative;
  text-align: left;
  background: var(--m2d-white);
  border: 1.5px solid var(--m2d-gray-200);
  border-radius: var(--radius-md);
  padding: 16px 44px 16px 16px;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.scenario-card:hover { border-color: var(--m2d-gray-400); }

.scenario-card.is-selected {
  border-color: var(--m2d-orange);
  box-shadow: 0 0 0 1px var(--m2d-orange);
  background: var(--m2d-orange-soft);
}

.scenario-card__title {
  font-weight: 700;
  font-size: 15px;
  color: var(--m2d-gray-800);
}

.scenario-card__subtitle {
  font-size: 13px;
  color: var(--m2d-gray-600);
  margin-top: 2px;
}

.scenario-card__check {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--m2d-gray-400);
  background: var(--m2d-white);
  display: flex;
  align-items: center;
  justify-content: center;
}

.scenario-card.is-selected .scenario-card__check {
  border-color: var(--m2d-orange);
  background: var(--m2d-orange);
  color: var(--m2d-white);
}

.scenario-card__check svg { width: 12px; height: 12px; display: none; }
.scenario-card.is-selected .scenario-card__check svg { display: block; }

/* ---------------------------------------------------------------------
   Mode toggle (Prudente / Realistico / Ottimistico)
   --------------------------------------------------------------------- */
.mode-toggle {
  display: inline-flex;
  background: var(--m2d-gray-200);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}

.mode-toggle button {
  border: none;
  background: transparent;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--m2d-gray-600);
  cursor: pointer;
}

.mode-toggle button.is-active {
  background: var(--m2d-black);
  color: var(--m2d-white);
}

/* ---------------------------------------------------------------------
   02 — Card di dettaglio scenario
   --------------------------------------------------------------------- */
.detail-card {
  background: var(--m2d-white);
  border: 1px solid var(--m2d-gray-200);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.detail-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
}

.detail-card__title { font-weight: 700; font-size: 15px; }
.detail-card__subtitle { font-size: 13px; color: var(--m2d-gray-600); margin-top: 2px; }

.detail-card__amount {
  font-weight: 800;
  color: var(--m2d-orange);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.detail-card__toggle {
  background: none;
  border: none;
  color: var(--m2d-gray-600);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 4px 8px;
}

.detail-card__body {
  padding: 4px 18px 20px;
  border-top: 1px solid var(--m2d-gray-200);
}

.detail-card__desc {
  font-size: 13px;
  color: var(--m2d-gray-600);
  margin: 14px 0;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 14px;
}

@media (max-width: 540px) {
  .field-grid { grid-template-columns: 1fr; }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--m2d-gray-600);
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.field label .unit { color: var(--m2d-gray-400); font-weight: 500; }

.field input,
.field select {
  border: 1.5px solid var(--m2d-gray-200);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  font-size: 14px;
  color: var(--m2d-gray-800);
  background: var(--m2d-white);
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--m2d-orange);
}

.field--assumption input { border-style: dashed; }

.empty-state {
  background: var(--m2d-white);
  border: 1.5px dashed var(--m2d-gray-200);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  color: var(--m2d-gray-600);
  font-size: 14px;
}

/* ---------------------------------------------------------------------
   Riepilogo formule (trasparenza di calcolo)
   --------------------------------------------------------------------- */
.summary-box {
  background: var(--m2d-white);
  border: 1px solid var(--m2d-gray-200);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-card);
}

.summary-box__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--m2d-gray-100);
}

.summary-box__row:last-of-type { border-bottom: none; }

.summary-box__row-label { font-size: 13px; font-weight: 600; }
.summary-box__row-formula {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--m2d-gray-600);
  flex: 1;
  text-align: left;
  padding: 0 10px;
}
.summary-box__row-value {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--m2d-orange);
  white-space: nowrap;
}

.summary-box__total {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 2px solid var(--m2d-gray-800);
}

.summary-box__total-label { font-weight: 700; font-size: 14px; }
.summary-box__total-sub { font-size: 12px; color: var(--m2d-gray-600); }
.summary-box__total-value { font-size: 20px; font-weight: 800; }

/* ---------------------------------------------------------------------
   Cockpit — pannello destro sticky
   --------------------------------------------------------------------- */
.cockpit {
  background: var(--m2d-black);
  color: var(--m2d-white);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.cockpit__field span {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 700;
  color: var(--m2d-gray-400);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.cockpit__field em { color: var(--m2d-gray-600); font-style: normal; }

.cockpit__field input {
  width: 100%;
  background: var(--m2d-black-soft);
  border: 1.5px solid var(--m2d-border-dark);
  border-radius: var(--radius-sm);
  color: var(--m2d-white);
  padding: 12px;
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.cockpit__field input:focus {
  outline: none;
  border-color: var(--m2d-orange);
}

.cockpit__hint {
  font-size: 12px;
  color: var(--m2d-gray-600);
  margin: 8px 0 20px;
}

.cockpit__benefit-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--m2d-gray-400);
  margin-bottom: 6px;
}

.cockpit__benefit-value {
  font-size: 38px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin-bottom: 18px;
}

.cockpit__metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.metric {
  background: var(--m2d-black-soft);
  border: 1px solid var(--m2d-border-dark);
  border-radius: var(--radius-sm);
  padding: 10px 8px;
  text-align: center;
}

.metric span {
  display: block;
  font-size: 17px;
  font-weight: 800;
  color: var(--m2d-orange);
  font-variant-numeric: tabular-nums;
}

.metric small {
  display: block;
  font-size: 9.5px;
  letter-spacing: 0.05em;
  color: var(--m2d-gray-400);
  margin-top: 3px;
}

.cockpit__note {
  font-size: 13px;
  background: var(--m2d-orange-soft);
  border-left: 3px solid var(--m2d-orange);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 14px;
  margin-bottom: 18px;
  color: var(--m2d-gray-200);
}

/* ---------------------------------------------------------------------
   Gate — "ultimo passo" (climax value-first)
   --------------------------------------------------------------------- */
.gate {
  border: 1.5px solid var(--m2d-orange);
  border-radius: var(--radius-md);
  padding: 20px;
  background: var(--m2d-black-soft);
}

.gate__eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--m2d-orange);
  margin-bottom: 8px;
}

.gate h3 {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 8px;
}

.gate > p:not(.gate__eyebrow):not(.gate__micro) {
  font-size: 13px;
  color: var(--m2d-gray-400);
  margin-bottom: 16px;
}

.gate__field {
  width: 100%;
  background: var(--m2d-black);
  border: 1.5px solid var(--m2d-border-dark);
  border-radius: var(--radius-sm);
  color: var(--m2d-white);
  padding: 11px 12px;
  font-size: 14px;
  margin-bottom: 10px;
}

.gate__field:focus {
  outline: none;
  border-color: var(--m2d-orange);
}

.gate__field::placeholder { color: var(--m2d-gray-600); }

.gate__error {
  color: #ff8a5c;
  font-size: 12px;
  margin: -4px 0 10px;
  min-height: 14px;
}

.gate__micro {
  text-align: center;
  font-size: 11.5px;
  color: var(--m2d-gray-600);
  margin-top: 12px;
}

.gate__result { margin-top: 4px; }

.gate__result-headline {
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 10px;
}

.gate__bar-track {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: var(--m2d-border-dark);
  margin: 18px 0 8px;
}

.gate__bar-fill {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  border-radius: 999px;
  background: var(--m2d-orange);
}

.gate__bar-marker {
  position: absolute;
  top: -6px;
  width: 2px;
  height: 20px;
  background: var(--m2d-white);
}

.gate__bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--m2d-gray-600);
}

.cockpit__privacy {
  font-size: 11px;
  color: var(--m2d-gray-600);
  text-align: center;
  margin-top: 16px;
}

.cockpit__privacy a { color: var(--m2d-gray-400); text-decoration: underline; }

/* ---------------------------------------------------------------------
   Footer
   --------------------------------------------------------------------- */
.site-footer {
  background: var(--m2d-black);
  color: var(--m2d-gray-400);
  padding: 36px 24px;
  text-align: center;
  font-size: 13px;
}

.site-footer a { color: var(--m2d-white); font-weight: 700; }

/* toast di errore/successo generico */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--m2d-black);
  color: var(--m2d-white);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.toast.is-visible { opacity: 1; }
.toast.is-error { border: 1px solid #ff8a5c; }