:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --testo: #1c1c1e;
  --secondario: #6e6e73;
  --bordo: #e5e5ea;
  --accento: #1f9d55;
  --accento-tenue: #e3f5ea;
  --pericolo: #d93025;
  --raggio: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --testo: #f2f2f7;
    --secondario: #98989f;
    --bordo: #2c2c2e;
    --accento: #34c26b;
    --accento-tenue: #12301f;
    --pericolo: #ff5f57;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--testo);
  font: 17px/1.35 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 12px) 16px calc(env(safe-area-inset-bottom) + 96px);
}

h1 { font-size: 34px; font-weight: 700; letter-spacing: -0.02em; margin: 8px 4px 16px; }

.vista { display: none; }
.vista.attiva { display: block; }

.card {
  background: var(--card);
  border-radius: var(--raggio);
  padding: 14px 16px;
  margin-bottom: 16px;
}

.etichetta { font-size: 13px; color: var(--secondario); text-transform: uppercase; letter-spacing: 0.03em; }
.nota { font-size: 13px; color: var(--secondario); }
.centro { text-align: center; }
.nascosto { display: none !important; }

/* Prezzo di riferimento */
.riferimento { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.rif-prezzo { font-size: 28px; font-weight: 600; font-variant-numeric: tabular-nums; margin: 2px 0; }
.rif-prezzo small { font-size: 15px; color: var(--secondario); font-weight: 400; }

/* Form */
.form { padding: 0 16px; }
.form label {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  min-height: 52px; border-top: 1px solid var(--bordo);
}
.form label:first-child { border-top: 0; }
.form input {
  border: 0; background: transparent; color: var(--testo); font: inherit;
  text-align: right; width: 7.5em; padding: 12px 0; outline: none;
  font-variant-numeric: tabular-nums;
}
.con-unita { display: flex; align-items: center; gap: 6px; }
.con-unita em { font-style: normal; color: var(--secondario); }

/* Risultato */
.risultato .riga {
  display: flex; justify-content: space-between; padding: 6px 0;
  color: var(--secondario); font-variant-numeric: tabular-nums;
}
.risultato .riga strong { color: var(--testo); font-weight: 500; }
.da-parte {
  margin-top: 10px; padding: 14px; border-radius: 12px;
  background: var(--accento-tenue); text-align: center;
}
.da-parte span { font-size: 14px; color: var(--accento); font-weight: 600; }
#out-risparmio { font-size: 44px; font-weight: 700; color: var(--accento); font-variant-numeric: tabular-nums; }

/* Bottoni */
button { font: inherit; cursor: pointer; }
.primario {
  width: 100%; border: 0; border-radius: var(--raggio); padding: 16px;
  background: var(--accento); color: #fff; font-weight: 600;
}
.primario:disabled { opacity: 0.4; }
.secondario {
  width: 100%; border: 0; border-radius: var(--raggio); padding: 14px; margin-top: 10px;
  background: var(--accento-tenue); color: var(--accento); font-weight: 600;
}
.link { background: none; border: 0; color: var(--accento); padding: 4px 0; font-size: 16px; cursor: pointer; }

/* Riepilogo */
.riepilogo { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.tile { background: var(--card); border-radius: var(--raggio); padding: 12px 14px; min-width: 0; }
.tile span { display: block; font-size: 13px; color: var(--secondario); }
.tile strong { font-size: 20px; font-variant-numeric: tabular-nums; }
.tile.evidenza { grid-column: span 3; background: var(--accento); color: #fff; }
.tile.evidenza span { color: rgba(255, 255, 255, 0.85); }
.tile.evidenza strong { font-size: 32px; }

/* Lista */
.mese { font-size: 13px; color: var(--secondario); text-transform: uppercase; margin: 18px 4px 6px; display: flex; justify-content: space-between; }
.gruppo { background: var(--card); border-radius: var(--raggio); overflow: hidden; }
.voce { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--bordo); }
.voce:last-child { border-bottom: 0; }
.voce .info { flex: 1; min-width: 0; }
.voce .titolo { font-weight: 500; font-variant-numeric: tabular-nums; }
.voce .dettaglio { font-size: 13px; color: var(--secondario); }
.voce .importo { font-weight: 600; font-variant-numeric: tabular-nums; }
.versato {
  border: 1.5px solid var(--accento); background: transparent; color: var(--accento);
  border-radius: 999px; padding: 4px 10px; font-size: 13px; white-space: nowrap;
}
.versato.si { background: var(--accento); color: #fff; }
.elimina { background: none; border: 0; color: var(--secondario); font-size: 20px; padding: 0 0 0 4px; line-height: 1; }
.vuoto { color: var(--secondario); text-align: center; padding: 24px 12px; }

.azioni { display: flex; justify-content: space-around; margin-top: 24px; margin-bottom: 8px; }

/* Tab bar */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0;
  display: flex; justify-content: center; gap: 48px;
  padding: 8px 16px calc(env(safe-area-inset-bottom) + 6px);
  background: color-mix(in srgb, var(--card) 85%, transparent);
  -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px);
  border-top: 1px solid var(--bordo);
}
.tab {
  background: none; border: 0; color: var(--secondario);
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  font-size: 11px; min-width: 72px;
}
.tab svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tab.attiva { color: var(--accento); }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom) + 84px);
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--testo); color: var(--bg); padding: 10px 18px; border-radius: 999px;
  font-size: 15px; transition: opacity 0.2s, transform 0.2s; white-space: nowrap;
}
.toast.visibile { opacity: 1; transform: translate(-50%, 0); }