/* ========================
   Input fields
   ======================== */
.field-block {
  margin-bottom: 1.1rem;
}

.field-block label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.field-block input[type="number"] {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.15s;
}

.field-block input[type="number"]:focus {
  outline: none;
  border-color: #aaa;
}

.field-hint {
  margin-top: 0.4rem;
  font-size: 0.76rem;
}

.field-hint a {
  color: var(--text-muted);
}

.form-error {
  margin-top: 0.65rem;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  color: #c0392b;
  text-align: center;
}

.btn-check {
  display: block;
  width: 100%;
  padding: 0.85rem;
  margin-top: 1.5rem;
  background: var(--text);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 0.02em;
  transition: opacity 0.15s;
}

.btn-check:hover {
  opacity: 0.85;
}

/* ========================
   Result
   ======================== */
.months-box {
  padding: 2rem 1.5rem;
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
  margin-bottom: 1.25rem;
}

.months-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.months-value {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.months-state {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breakdown {
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.breakdown-heading {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.breakdown-formula {
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.6;
}

.disclaimer {
  font-size: 0.74rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* ========================
   Save to history
   ======================== */
.history-save,
.history-saved {
  text-align: center;
  margin-bottom: 1.25rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.btn-save-history {
  padding: 0.6rem 1.4rem;
  background: transparent;
  border: 1px solid var(--text);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
}

.btn-save-history:hover {
  background: var(--text);
  color: #fff;
}

.saved-message {
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.history-link {
  font-size: 0.82rem;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.history-link:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .months-value {
    font-size: 1.9rem;
  }
}