:root {
  --long-accent: #0b57d0;
  --long-surface: #f8fbff;
  --long-muted: #475569;
  --long-border: #d9e2ec;
  --long-strong: #0f172a;
  --long-chip: #eef2ff;
  --long-chip-border: #c7d2fe;
  --long-chip-text: #312e81;
}
:root.dark {
  --long-surface: #0b1323;
  --long-muted: #cbd5e1;
  --long-border: #1f2937;
  --long-strong: #e2e8f0;
  --long-chip: #111827;
  --long-chip-border: #1f2937;
  --long-chip-text: #c7d2fe;
}

.long-add-sub header .eyebrow {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--long-accent);
  font-weight: 800;
  margin-bottom: 6px;
}

.long-grid {
  display: grid;
  gap: 16px;
}
.long-grid.two-col {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  align-items: start;
}
.long-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.long-field {
  background: var(--long-surface);
  border: 1px solid var(--long-border);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.long-field .label {
  font-weight: 700;
  color: var(--long-strong);
}
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--long-border);
  background: #fff;
  font-weight: 700;
  color: var(--long-strong);
}
.pill input {
  margin: 0;
}

.long-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.long-actions .button {
  min-width: 120px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0;
}
.chip {
  border: 1px solid var(--long-chip-border);
  background: var(--long-chip);
  color: var(--long-chip-text);
  padding: 8px 12px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}
.chip:hover {
  border-color: var(--long-accent);
  color: var(--long-accent);
}

.result-panel {
  background: linear-gradient(180deg, rgba(11, 87, 208, 0.06) 0%, rgba(11, 87, 208, 0.02) 100%);
  border: 1px solid var(--long-border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 12px 36px rgba(11, 87, 208, 0.12);
}
.result-value {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--long-strong);
  word-break: break-word;
}
.result-note {
  color: var(--long-muted);
}

.layout-shell {
  background: #fff;
  border: 1px solid var(--long-border);
  border-radius: 12px;
  padding: 10px;
  overflow-x: auto;
}
.steps-list {
  padding-left: 18px;
  line-height: 1.5;
}
.steps-list li.active-step {
  background: rgba(11, 87, 208, 0.1);
  border-radius: 8px;
  padding: 6px;
}

.step-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}
.long-note {
  color: var(--long-muted);
}

.is-teacher .layout-shell {
  border-width: 2px;
}
.is-teacher .steps-list li.active-step {
  border: 2px solid var(--long-accent);
}

@media (min-width: 1080px) {
  .long-grid.two-col {
    grid-template-columns: minmax(360px, 520px) 1fr;
  }
}