.signup-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 30px 0 56px;
}

.signup-intro {
  max-width: 760px;
  margin-bottom: 20px;
}

.how-it-works-link {
  display: inline-block;
  margin: 14px 0 0;
  padding: 10px 12px;
  border-left: 4px solid #005B8F;
  background: #eef7fb;
  border-radius: 6px;
  color: #24465d;
  font-weight: 700;
}

.how-it-works-link a {
  color: #005B8F;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.kicker {
  color: var(--primary);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-size: .85rem;
}

.signup-intro h1,
.confirmation-card h1 {
  margin: 0 0 10px;
  color: #123850;
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.signup-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 22px;
  align-items: start;
}

.form-main {
  display: grid;
  gap: 16px;
}

.form-section,
.estimate-panel,
.form-alert,
.confirmation-card {
  background: #fff;
  border: 1px solid rgba(0, 63, 99, .12);
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .05);
  padding: 20px;
}

.form-section h2,
.estimate-panel h2 {
  margin: 0 0 10px;
  color: #123850;
  font-size: 1.3rem;
}

.section-help,
.fine-print {
  color: #526273;
  font-size: .95rem;
  line-height: 1.45;
}

.strong {
  font-weight: 800;
  color: #123850;
}

.field-grid {
  display: grid;
  gap: 14px;
}

.field-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field-grid.three {
  grid-template-columns: 1.3fr .5fr .7fr;
}

label {
  display: block;
  font-weight: 800;
  color: #17283a;
}

label:not(.choice-card) > span {
  color: #d73525;
}

input,
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid rgba(0, 63, 99, .22);
  border-radius: 6px;
  padding: 10px 12px;
  font: inherit;
}

label > input,
label > select {
  margin-top: 6px;
}

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

.choice-card {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(0, 63, 99, .18);
  border-radius: 8px;
  padding: 13px;
  background: #f8fbfd;
}

.choice-card input {
  width: 18px;
  min-height: 18px;
}

.same-student-note {
  display: none;
  background: #eef7fb;
  color: #123850;
  border-left: 4px solid var(--primary);
  padding: 12px;
  border-radius: 6px;
  font-weight: 700;
}

.check-row {
  display: grid;
  grid-template-columns: 20px 1fr;
  align-items: start;
}

.check-row input {
  width: 18px;
  min-height: 18px;
  margin-top: 3px;
}

.check-row small {
  grid-column: 2;
  color: #526273;
  font-weight: 600;
}

.signup-sidebar {
  display: grid;
  gap: 12px;
  position: sticky;
  top: 16px;
}

.sandbox-operator-card {
  padding: 14px 16px;
  border: 1px solid rgba(0, 63, 99, .18);
  border-left: 4px solid #005B8F;
  border-radius: 6px;
  background: #f6fafc;
  box-shadow: 0 3px 10px rgba(0, 0, 0, .035);
}

.sandbox-operator-card h2 {
  margin: 0;
  color: #123850;
  font-size: 1rem;
}

.sandbox-operator-card > p {
  margin: 4px 0 12px;
  color: #526273;
  font-size: .82rem;
}

.sandbox-control {
  position: relative;
  min-width: 0;
  min-height: 30px;
  margin: 8px 0 0;
  padding: 5px 104px 5px 0;
  border: 0;
}

.sandbox-control legend {
  max-width: 175px;
  padding: 0;
  color: #17283a;
  font-size: .84rem;
  font-weight: 800;
  line-height: 20px;
}

.sandbox-toggle {
  position: absolute;
  top: 0;
  right: 0;
  display: inline-grid;
  grid-template-columns: repeat(2, 46px);
  overflow: hidden;
  border: 1px solid rgba(0, 63, 99, .24);
  border-radius: 5px;
  background: #fff;
}

.sandbox-toggle label {
  position: relative;
  cursor: pointer;
}

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

.sandbox-toggle span {
  display: grid;
  min-height: 28px;
  place-items: center;
  color: #526273;
  font-size: .75rem;
  font-weight: 900;
}

.sandbox-toggle label + label span {
  border-left: 1px solid rgba(0, 63, 99, .16);
}

.sandbox-toggle input:checked + span {
  background: #FD3B26;
  color: #fff;
}

.sandbox-toggle input:focus-visible + span {
  position: relative;
  z-index: 1;
  outline: 3px solid #005B8F;
  outline-offset: -3px;
}

.estimate-panel {
  position: static;
}

#estimateLines {
  display: grid;
  gap: 8px;
  margin: 16px 0;
}

#estimateLines div,
.estimate-total,
.confirm-items li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid #e6edf2;
  padding: 8px 0;
}

.estimate-total {
  font-size: 1.1rem;
  color: #123850;
}

button[type="submit"] {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 6px;
  background: #FD3B26;
  color: #fff;
  font-weight: 900;
  font-size: 1rem;
  cursor: pointer;
}

.form-alert {
  border-left: 5px solid #FD3B26;
  margin-bottom: 18px;
}

.form-alert.success {
  border-color: #1e8b54;
  background: #eefaf3;
}

.confirm-list {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 10px 18px;
}

.confirm-list dt {
  color: #526273;
  font-weight: 800;
}

.confirm-list dd {
  margin: 0;
  font-weight: 800;
  color: #123850;
}

.confirm-items {
  list-style: none;
  padding: 0;
}

@media (max-width: 900px) {
  .signup-grid,
  .field-grid.two,
  .field-grid.three,
  .choice-row {
    grid-template-columns: 1fr;
  }

  .estimate-panel {
    position: static;
  }

  .signup-sidebar {
    position: static;
  }
}