.isto-checkout {
  max-width: 820px;
  margin: 40px auto;
  background: #fff;
  border: 1px solid rgba(24, 56, 41, 0.18);
  border-radius: 16px;
  padding: 20px;
}

.isto-checkout__title {
  margin: 0 0 16px;
  font-size: 28px;
  color: #183829;
}

.isto-checkout__errors {
  background: #fff3f3;
  border: 1px solid rgba(220, 53, 69, 0.3);
  color: #842029;
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 16px;
}

.isto-fieldset {
  border: 1px solid rgba(24, 56, 41, 0.18);
  border-radius: 12px;
  padding: 14px;
  margin: 0 0 16px;
}

.isto-fieldset__legend {
  font-weight: 700;
  color: #183829;
  margin-bottom: 10px;
}

.isto-radio {
  display: flex;
  gap: 10px;
  align-items: center;
  margin: 8px 0;
}

.isto-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.isto-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.isto-field__label {
  font-size: 14px;
  color: #363a45;
}

.isto-field input,
.isto-field select {
  height: 42px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid rgba(24, 56, 41, 0.25);
  outline: none;
}

.isto-field input[readonly] {
  background: #f7f8f8;
}

.isto-field--full {
  grid-column: 1 / -1;
}

.isto-hint {
  font-size: 13px;
  color: #46545b;
  margin-top: 8px;
}

.isto-actions {
  display: flex;
  justify-content: flex-end;
}

.isto-btn {
  height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: 10px;
  background: #183829;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

@media (max-width: 720px) {
  .isto-grid {
    grid-template-columns: 1fr;
  }
}

.isto-checkout-summary {
  background: #f6f8f7;
  border: 1px solid rgba(24, 56, 41, 0.15);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 16px;
}

.isto-checkout-summary__title {
  font-weight: 700;
  color: #183829;
  margin: 0 0 8px;
  font-size: 16px;
}

.isto-checkout-summary__meta {
  margin: 0;
  font-size: 14px;
  color: #363a45;
  line-height: 1.5;
}

.isto-checkout-summary__change {
  display: inline-block;
  margin-top: 10px;
  font-size: 14px;
}

.isto-checkout-totals {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(24, 56, 41, 0.15);
}

.isto-checkout-totals__title {
  font-weight: 700;
  color: #183829;
  margin-bottom: 10px;
  font-size: 15px;
}

.isto-checkout-totals__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 14px;
  color: #363a45;
  margin: 6px 0;
}

.isto-checkout-totals__row--sum {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(24, 56, 41, 0.2);
  font-weight: 700;
  color: #183829;
  font-size: 16px;
}