.tool {
  --tool-radius: 20px;
  --tool-field-radius: 12px;
  --tool-ring: rgba(37, 99, 235, 0.18);
  --tool-ok: #16a34a;
  --tool-ok-bg: #ecfdf3;
  --tool-bad: #dc2626;
  --tool-bad-bg: #fef2f2;
  --tool-warn: #b45309;
  --tool-warn-bg: #fffbeb;
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--tool-radius);
  box-shadow: 0 1px 2px rgba(28, 25, 23, 0.04), 0 12px 32px -12px rgba(28, 25, 23, 0.12);
  padding: 28px;
  margin: 32px 0;
}

.tool h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 20px;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.tool h2 + p {
  margin: -12px 0 20px;
  color: var(--c-text-secondary);
}

.tool__step {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c-brand), #7c3aed);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 800;
}

.tool__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
}

.tool__grid--compact {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.tool__field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  border: 0;
}

.tool__label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--c-text-secondary);
  padding: 0;
}

.tool__input {
  position: relative;
  display: flex;
  align-items: center;
}

.tool__input input,
.tool__field > input {
  width: 100%;
  min-width: 0;
  height: 50px;
  padding: 0 16px;
  font: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-text);
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--tool-field-radius);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  -moz-appearance: textfield;
  appearance: textfield;
}

.tool__field > input {
  font-size: 1rem;
  font-weight: 600;
}

.tool__input input::-webkit-outer-spin-button,
.tool__input input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.tool__input input:hover,
.tool__field > input:hover {
  border-color: #d6d3d1;
}

.tool__input input:focus,
.tool__field > input:focus {
  outline: none;
  background: var(--c-surface);
  border-color: var(--c-brand);
  box-shadow: 0 0 0 4px var(--tool-ring);
}

.tool__input input:invalid {
  border-color: var(--tool-bad);
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.12);
}

.tool__input--money::before,
.tool__input--percent::after {
  position: absolute;
  font-weight: 700;
  color: #a8a29e;
  pointer-events: none;
}

.tool__input--money::before {
  content: "$";
  left: 16px;
}

.tool__input--money input {
  padding-left: 32px;
}

.tool__input--percent::after {
  content: "%";
  right: 16px;
}

.tool__input--percent input {
  padding-right: 36px;
}

.segmented {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--c-border-light);
  border: 1.5px solid var(--c-border);
  border-radius: var(--tool-field-radius);
  min-height: 50px;
}

.segmented label {
  flex: 1;
  position: relative;
  display: flex;
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented span {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 6px 10px;
  border-radius: 9px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.segmented span:hover {
  color: var(--c-text);
}

.segmented input:checked + span {
  background: var(--c-surface);
  color: var(--c-brand);
  box-shadow: 0 1px 3px rgba(28, 25, 23, 0.12);
}

.segmented input:focus-visible + span {
  box-shadow: 0 0 0 3px var(--tool-ring);
}

.tool__results {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.tool__result {
  flex: 1 1 150px;
  padding: 16px 18px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.tool__result span {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-text-secondary);
}

.tool__result strong {
  display: inline-block;
  margin-top: 2px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  transition: color 0.25s ease;
}

.tool__result--hero {
  flex-basis: 100%;
  padding: 22px 24px;
  border: 0;
  color: #fff;
  background: radial-gradient(circle at 100% 0%, rgba(255, 255, 255, 0.18), transparent 45%), linear-gradient(135deg, var(--c-brand), #4f46e5 60%, #7c3aed);
  box-shadow: 0 12px 28px -12px rgba(79, 70, 229, 0.6);
}

.tool__result--hero span {
  color: rgba(255, 255, 255, 0.82);
}

.tool__result--hero strong {
  font-size: clamp(2rem, 7vw, 2.75rem);
}

.tool__result--negative {
  background: var(--tool-bad-bg);
  border-color: #fecaca;
}

.tool__result--negative strong {
  color: var(--tool-bad);
}

.tool__result--hero.tool__result--negative {
  color: #fff;
  background: linear-gradient(135deg, #ef4444, #b91c1c);
  box-shadow: 0 12px 28px -12px rgba(185, 28, 28, 0.6);
}

.tool__result--hero.tool__result--negative strong {
  color: #fff;
}

.tool__result--ok {
  color: #fff;
  background: linear-gradient(135deg, #22c55e, #15803d);
  box-shadow: 0 12px 28px -12px rgba(21, 128, 61, 0.55);
}

.tool__result--surplus {
  color: #fff;
  background: linear-gradient(135deg, #f59e0b, #b45309);
  box-shadow: 0 12px 28px -12px rgba(180, 83, 9, 0.55);
}

.is-updated {
  animation: tool-pop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes tool-pop {
  0% {
    transform: translateY(4px) scale(0.97);
    opacity: 0.5;
  }

  100% {
    transform: none;
    opacity: 1;
  }
}

.tool__note {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--c-text-secondary);
}

.tool__note:empty {
  display: none;
}

.tool__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.tool__button {
  height: 46px;
  padding: 0 20px;
  font: inherit;
  font-weight: 700;
  color: var(--c-text);
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: var(--tool-field-radius);
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.15s ease, background 0.15s ease;
}

.tool__button:hover {
  border-color: var(--c-text);
}

.tool__button:active {
  transform: scale(0.97);
}

.tool__button--primary {
  color: #fff;
  background: var(--c-text);
  border-color: var(--c-text);
}

.tool__button--primary:hover {
  background: #000;
}

.bills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 360px), 1fr));
  gap: 10px;
}

.bill {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.bill--counted {
  background: #eff6ff;
  border-color: #bfdbfe;
}

.bill__face {
  display: grid;
  place-items: center;
  height: 40px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: #14532d;
  background: repeating-linear-gradient(45deg, #dcfce7, #dcfce7 6px, #bbf7d0 6px, #bbf7d0 12px);
  border: 1px solid #86efac;
}

.bill__subtotal {
  min-width: 84px;
  text-align: right;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-text-secondary);
}

.bill--counted .bill__subtotal {
  color: var(--c-text);
}

.stepper {
  display: flex;
  align-items: center;
  justify-self: center;
  gap: 4px;
}

.stepper button {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  font: inherit;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-text);
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.1s ease, border-color 0.15s ease;
}

.stepper button:hover {
  border-color: var(--c-brand);
  color: var(--c-brand);
}

.stepper button:active {
  transform: scale(0.9);
}

.stepper input {
  width: 52px;
  height: 34px;
  padding: 0;
  text-align: center;
  font: inherit;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  background: transparent;
  border: 0;
  -moz-appearance: textfield;
  appearance: textfield;
}

.stepper input::-webkit-outer-spin-button,
.stepper input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.stepper input:focus {
  outline: 2px solid var(--c-brand);
  border-radius: 6px;
}

.tool__total {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--c-border);
  font-weight: 700;
}

.tool__total strong {
  font-size: 1.3rem;
  font-variant-numeric: tabular-nums;
}

@media (prefers-reduced-motion: reduce) {
  .is-updated {
    animation: none;
  }

  .tool *,
  .tool {
    transition: none !important;
  }
}

@media (max-width: 640px) {
  .tool {
    padding: 20px 16px;
    border-radius: 16px;
  }

  .bill {
    grid-template-columns: 76px 1fr auto;
    gap: 8px;
  }

  .bill__subtotal {
    min-width: 72px;
    font-size: 0.9rem;
  }
}

@media print {
  .tool__actions,
  .stepper button {
    display: none !important;
  }

  .tool {
    box-shadow: none;
    border: 0;
    padding: 0;
  }

  .tool__result--hero,
  .tool__result--ok,
  .tool__result--surplus,
  .tool__result--hero.tool__result--negative {
    color: #000;
    background: none;
    border: 2px solid #000;
    box-shadow: none;
  }

  .tool__result--hero span,
  .tool__result--hero strong,
  .tool__result--hero.tool__result--negative strong {
    color: #000;
  }
}