.auth-card { max-width: 400px; margin: 3rem auto; }
.field { margin-bottom: 1rem; }
.field label {
  display: block; margin-bottom: .25rem;
  color: var(--c-muted); font-size: .85rem; font-weight: 500;
}
.field input,
.field select,
.field textarea {
  width: 100%; padding: .55rem .75rem; border: 1px solid var(--c-border);
  border-radius: var(--radius); background: var(--c-surface);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--c-accent); outline: 2px solid #93c5fd; outline-offset: 0;
}
form .btn { margin-top: .5rem; }
.data-table.compact td, .data-table.compact th { padding: .35rem .6rem; }
.data-table.kv th { width: 200px; text-align: left; background: #f8fafc; color: var(--c-muted); font-weight: 500; }
.entity-form .form-section {
  border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 1rem 1.25rem; margin: 1rem 0; background: #fafbfc;
}
.entity-form legend { padding: 0 .5rem; font-weight: 600; color: var(--c-accent); }
.entity-form .row { display: flex; gap: 1rem; flex-wrap: wrap; }
.entity-form .row .field { flex: 1 1 200px; }
.entity-form .full { width: 100%; }
.entity-form .checkbox-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .35rem;
}
.entity-form .checkbox-grid label { display: flex; align-items: center; gap: .35rem; }
.form-actions { display: flex; gap: .5rem; margin-top: 1rem; }
.btn.danger { background: var(--c-error-bg); color: var(--c-error); border-color: var(--c-error-bg); }
.btn.danger:hover { background: #fecaca; border-color: #fecaca; }
.actions a.danger { color: var(--c-error); }
.cat-preview { background: #fef3c7; border: 1px solid #fcd34d; border-radius: var(--radius); padding: .75rem 1rem; margin: 0 0 1rem; }
.cat-preview label { display: block; margin-bottom: .35rem; font-weight: 600; }
.field.required > label::before { content: "(*) "; color: var(--c-error, #b91c1c); font-weight: 600; }
.aircraft-form-card { padding: 0; overflow: hidden; }
.form-topbar { display: flex; justify-content: space-between; align-items: flex-start;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--c-border); gap: 1rem; }
.form-topbar h1 { margin: 0; font-size: 1.25rem; }
.form-topbar .meta { margin: .15rem 0 0; }
.topbar-actions { display: flex; gap: .4rem; }
.form-tabs { display: flex; gap: .15rem; padding: 0 1.25rem;
  border-bottom: 1px solid var(--c-border); background: #fafbfc; flex-wrap: wrap; }
.form-tabs .tab { background: none; border: 0; padding: .65rem .95rem;
  cursor: pointer; color: var(--c-muted); font-size: .9rem; font-family: inherit;
  border-bottom: 2px solid transparent; font-weight: 500; }
.form-tabs .tab:hover { color: var(--c-text); }
.form-tabs .tab.active { color: var(--c-accent); border-bottom-color: var(--c-accent); }
.tab-panels { padding: 1rem 1.25rem 4.5rem; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.form-savebar { position: sticky; bottom: 0; background: var(--c-surface);
  padding: .75rem 1.25rem; border-top: 1px solid var(--c-border);
  display: flex; gap: .5rem; box-shadow: 0 -4px 12px rgba(15,23,42,.05); }
.form-cols { display: grid; gap: 0 1rem; }
.form-cols > * { min-width: 0; }
.form-cols > * .form-section { margin: 0 0 1rem; }
@media (min-width: 960px) { .form-cols { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

.info-grid { display: grid; gap: .75rem 1rem; grid-template-columns: 1fr; }
.info-grid .field { margin: 0; }
@media (min-width: 640px)  { .info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 960px)  { .info-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 1280px) { .info-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

/* Unit toggle + metric/US twin-input visibility per `data-units` on fieldset. */
.units-toggle { display: flex; align-items: center; gap: .35rem; margin: 0 0 .75rem; flex-wrap: wrap; font-size: .85rem; }
.units-toggle .btn-link { padding: .15rem .55rem; border: 1px solid var(--c-border); border-radius: 4px; background: var(--c-surface); color: var(--c-fg); cursor: pointer; }
.units-toggle .btn-link.active { background: var(--c-accent); color: #fff; border-color: var(--c-accent); }
.units-toggle .units-note { color: var(--c-muted); font-size: .8rem; margin-left: .25rem; }

/* Mode-driven visibility — metric input is the form field; US is the twin. */
.info-fieldset[data-units="metric"] .info-us { display: none; }
.info-fieldset[data-units="us"] .info-metric { display: none; }
.info-fieldset[data-units="both"] .info-metric,
.info-fieldset[data-units="both"] .info-us { display: block; margin-top: .25rem; }
.info-fieldset[data-units="both"] .info-metric { margin-top: 0; }