.investment-calculator-shell {
  display: grid;
  gap: 16px;
}

.calculator-intro,
.calculator-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.calculator-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.calculator-tab {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 8px 12px;
  background: var(--surface);
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.calculator-tab:hover,
.calculator-tab[aria-selected="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.calculator-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, .72fr);
  gap: 14px;
  align-items: stretch;
}

.calculator-form,
.calculator-result {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 16px;
}

.calculator-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.calculator-field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.calculator-field label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.calculator-field input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 11px;
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.calculator-field input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-color: var(--accent);
}

.calculator-result {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}

.calculator-result span,
.calculator-result small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.calculator-result strong {
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.calculator-result .calculator-secondary {
  font-size: 15px;
  font-weight: 700;
}

.calculator-result .is-positive { color: var(--up); }
.calculator-result .is-negative { color: var(--down); }

.calculator-guide {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.calculator-guide article {
  border-left: 3px solid var(--accent);
  padding: 10px 12px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

@media (max-width: 760px) {
  .calculator-panel,
  .calculator-guide {
    grid-template-columns: 1fr;
  }

  .calculator-form {
    grid-template-columns: 1fr 1fr;
    padding: 13px;
  }
}

@media (max-width: 420px) {
  .calculator-form {
    grid-template-columns: 1fr;
  }

  .calculator-tab {
    padding: 7px 10px;
    font-size: 12px;
  }
}