/* ================================================================
   Wapel.app — Design Tokens
   Direzione: economia locale circolare, token di scambio fisico,
   "Flow" come liquido che riempie/svuota un vasetto di valore.
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700&family=IBM+Plex+Mono:wght@500;600&family=Inter:wght@400;500;600&display=swap');

:root {
  /* Colore */
  --bg: #EDEFE6;
  --bg-elevated: #F7F8F2;
  --ink: #1B2A22;
  --ink-muted: #5B6B60;
  --primary: #3D6B4F;
  --primary-ink: #F7F8F2;
  --accent-flow: #C98A2E;
  --error: #B3432B;
  --border: #D3D8C8;

  /* Tipografia */
  --font-display: 'Fraunces', serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-ui: 'Inter', sans-serif;

  /* Layout */
  --radius: 20px;
  --radius-sm: 12px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14201B;
    --bg-elevated: #1C2A23;
    --ink: #EDEFE6;
    --ink-muted: #93A398;
    --primary: #5C9773;
    --primary-ink: #0E1712;
    --accent-flow: #E0A94C;
    --border: #2C3B32;
  }
}

* { 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;
}

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: 3px solid var(--accent-flow);
  outline-offset: 2px;
}

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

.merchant-id {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

.merchant-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 28px;
  line-height: 1.15;
  margin: var(--space-1) 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: 120px;
  height: 140px;
}

.flow-jar-fill {
  transition: height 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.flow-balance-number {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  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: 14px;
  color: var(--ink-muted);
  margin-bottom: var(--space-1);
}

.amount-input-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  border-bottom: 2px solid var(--border);
  padding-bottom: var(--space-1);
}

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

.amount-currency {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--ink-muted);
}

#amountInput {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 600;
  width: 100%;
  text-align: center;
  border: none;
  background: transparent;
  color: var(--ink);
}

.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); }

/* --- Anteprima calcolo (SOLO stima, non autoritativa — vedi app.js) --- */
.preview-box {
  background: var(--bg-elevated);
  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: 32px;
  font-weight: 600;
  color: var(--primary);
}

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

/* --- Bottone conferma --- */
.btn-primary {
  width: 100%;
  padding: 18px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--primary-ink);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 17px;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

/* --- 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-size: 24px;
  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: 40px;
  font-weight: 600;
  color: var(--accent-flow);
  margin: var(--space-2) 0;
}