.area-shell {
  min-height: 100vh;
  box-sizing: border-box;

  padding: 28px 18px 70px;

  display: flex;
  flex-direction: column;
  align-items: center;
}

.area-header {
  width: 100%;
  max-width: 760px;
  text-align: center;
}

.area-logo {
  display: block;
  width: min(24vw, 210px);
  height: auto;
  margin: 0 auto;
}

.area-header h1 {
  margin: 20px 0 8px;
  font-size: clamp(30px, 4vw, 44px);
}

.area-intro {
  margin: 0;
  color: #bbb;
  font-size: 16px;
}

.area-card {
  width: min(94vw, 680px);

  margin-top: 34px;
  padding: 24px;

  box-sizing: border-box;

  border: 1px solid #3f3f3f;
  border-radius: 14px;

  background: #0d0d0d;
}

.primary-group label {
  display: block;
  margin-bottom: 8px;

  font-size: 18px;
  font-weight: 700;
}

.primary-input {
  width: 100%;
  box-sizing: border-box;

  padding: 16px;

  border: 1px solid #666;
  border-radius: 10px;

  background: #000;
  color: #fff;

  font-size: 26px;
  font-weight: 700;

  text-align: right;
}

.section-divider {
  height: 1px;
  margin: 24px 0;
  background: #333;
}

.unit-section h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.unit-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;

  align-items: center;

  margin-top: 10px;
}

.unit-row label {
  color: #ddd;
}

.unit-row input {
  width: 100%;
  box-sizing: border-box;

  padding: 11px 12px;

  border: 1px solid #444;
  border-radius: 8px;

  background: #000;
  color: #fff;

  font-size: 17px;
  text-align: right;
}

.clear-button {
  width: 100%;

  margin-top: 24px;
  padding: 13px;

  border: 1px solid #555;
  border-radius: 9px;

  background: #151515;
  color: #fff;

  font-size: 16px;
  font-weight: 700;

  cursor: pointer;
}

.area-back-row {
  margin-top: 28px;
}

.area-back-button {
  display: inline-block;

  padding: 11px 16px;

  border: 1px solid #555;
  border-radius: 8px;

  color: #fff;
  text-decoration: none;
}

.primary-input:focus,
.unit-row input:focus {
  outline: none;
  border-color: #aaa;
  background: #151515;
}

.primary-input:focus {
  border-width: 2px;
}

@media (max-width: 520px) {

  .unit-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

}