/* ================================================================
   Wapel.app — Design Tokens (Fintech Minimal)
   Ispirazione: Stripe / Apple / Revolut. Superfici bianche pulite,
   angoli morbidi, ombre leggerissime, un solo colore d'accento
   (ambra/bronzo satinato) riservato al Flow. Font di sistema per
   massime prestazioni e coerenza nativa su ogni dispositivo.
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* --- Superfici --- */
  --bg: #F8F9FA;               /* sfondo app: grigio chiarissimo quasi bianco */
  --bg-elevated: #FFFFFF;      /* card: bianco puro */
  --bg-sunken: #F1F3F5;        /* incavi, hover neutri, input */

  /* --- Testo --- */
  --ink: #0F1419;              /* testo primario, alto contrasto */
  --ink-muted: #6B7280;        /* testo secondario */
  --ink-faint: #9CA3AF;        /* testo terziario / placeholder */

  /* --- Brand --- */
  --primary: #0B5FFF;          /* blu fintech elettrico — azioni primarie */
  --primary-hover: #0A52DE;
  --primary-ink: #FFFFFF;
  --accent-flow: #C88A3D;      /* oro ambrato caldo / bronzo satinato — SOLO Flow */
  --accent-flow-soft: #FBF1E1;
  --error: #E5484D;
  --error-soft: #FDEEEE;
  --success: #12A150;
  --success-soft: #E9F9EF;

  /* --- Bordi --- */
  --border: #E7E9EC;
  --border-strong: #D6D9DE;

  /* --- Tipografia --- */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* --- Raggi e ombre --- */
  --radius: 16px;
  --radius-sm: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(15, 20, 25, 0.04), 0 1px 1px rgba(15, 20, 25, 0.03);
  --shadow-md: 0 4px 16px rgba(15, 20, 25, 0.06), 0 2px 6px rgba(15, 20, 25, 0.04);
  --shadow-lg: 0 12px 32px rgba(15, 20, 25, 0.10), 0 4px 12px rgba(15, 20, 25, 0.05);

  /* --- Spaziatura --- */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;

  /* --- Transizioni --- */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 150ms var(--ease);
  --transition-base: 220ms var(--ease);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B0F19;              /* modalità scura profonda */
    --bg-elevated: #131826;
    --bg-sunken: #1A2030;
    --ink: #F5F6F8;
    --ink-muted: #9CA6B8;
    --ink-faint: #6B7688;
    --primary: #4C8DFF;
    --primary-hover: #6BA0FF;
    --primary-ink: #0B0F19;
    --accent-flow: #E0A94C;
    --accent-flow-soft: rgba(224, 169, 76, 0.12);
    --error: #FF6369;
    --error-soft: rgba(255, 99, 105, 0.12);
    --success: #34D97C;
    --success-soft: rgba(52, 217, 124, 0.12);
    --border: #232A3B;
    --border-strong: #2E3648;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.32);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.40);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: flex;
  justify-content: center;
  padding: var(--space-3) var(--space-2) var(--space-4);
}

#app {
  width: 100%;
  max-width: 420px;
}

/* --- Focus visibile (accessibilità) --- */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --- Card commerciante --- */
.merchant-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-3);
  text-align: center;
}

.merchant-id {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

.merchant-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 4px 0 var(--space-3);
}

/* --- Vasetto Flow (elemento firma) --- */
.flow-jar-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}

.flow-jar {
  width: 116px;
  height: 136px;
}

.flow-jar-fill {
  transition: height 0.6s var(--ease);
}

.flow-balance-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--accent-flow);
}

.flow-balance-label {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--ink-muted);
}

/* --- Input importo --- */
.amount-field {
  margin: var(--space-3) 0 var(--space-2);
}

.amount-field label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-muted);
  margin-bottom: var(--space-1);
}

.amount-input-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  background: var(--bg-sunken);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-1);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.amount-input-row:focus-within {
  border-color: var(--primary);
  background: var(--bg-elevated);
}

.amount-input-row.has-error {
  border-color: var(--error);
  background: var(--error-soft);
}

.amount-currency {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  color: var(--ink-faint);
}

#amountInput {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.02em;
  width: 100%;
  text-align: center;
  border: none;
  background: transparent;
  color: var(--ink);
}

#amountInput:focus { outline: none; }

.field-hint {
  text-align: center;
  font-size: 13px;
  color: var(--ink-muted);
  margin-top: var(--space-1);
  min-height: 18px;
}

.field-hint.error { color: var(--error); font-weight: 500; }

/* --- Anteprima calcolo (SOLO stima, non autoritativa — vedi app.js) --- */
.preview-box {
  background: var(--accent-flow-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  margin-bottom: var(--space-3);
  text-align: center;
}

.preview-flow-amount {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--accent-flow);
}

.preview-label {
  font-size: 13px;
  color: var(--ink-muted);
}

/* --- Bottoni --- */
.btn-primary {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--primary-ink);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.btn-primary:hover:not(:disabled) { background: var(--primary-hover); box-shadow: var(--shadow-md); }
.btn-primary:active:not(:disabled) { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }

/* --- Stati: caricamento, errore, successo --- */
.state-screen {
  text-align: center;
  padding: var(--space-4) var(--space-2);
}

.state-screen .headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
}

.state-screen .subline {
  color: var(--ink-muted);
  font-size: 15px;
}

.state-screen.is-error .headline { color: var(--error); }
.state-screen.is-success .flow-net-final {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--accent-flow);
  margin: var(--space-2) 0;
}