.backend-contact-panel,
.backend-lab {
  margin: clamp(2rem, 5vw, 4rem) 0;
  border: 1px solid var(--border, #d4d4d4);
  border-radius: 1.5rem;
  background: var(--card, #fff);
  color: var(--foreground, #111);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: 0 18px 50px rgba(0, 0, 0, .07);
}

.backend-section-heading,
.backend-lab-heading { max-width: 48rem; margin-bottom: 1.5rem; }
.backend-section-heading > span { font-size: .75rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.backend-section-heading h2,
.backend-lab-heading h1 { margin: .45rem 0 .65rem; }
.backend-section-heading p,
.backend-lab-heading p { color: var(--muted-foreground, #666); }

.backend-form { display: grid; gap: 1rem; }
.backend-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.backend-form label { display: grid; gap: .45rem; font-size: .9rem; font-weight: 650; }
.backend-form label small { color: var(--muted-foreground, #666); font-weight: 400; }
.backend-form input:not([type="checkbox"]),
.backend-form select,
.backend-form textarea {
  width: 100%;
  border: 1px solid var(--border, #cfcfcf);
  border-radius: .8rem;
  background: var(--background, #fff);
  color: inherit;
  padding: .8rem .9rem;
  font: inherit;
}
.backend-form textarea { resize: vertical; }
.backend-form input:focus,
.backend-form select:focus,
.backend-form textarea:focus { outline: 2px solid currentColor; outline-offset: 2px; }
.backend-consent { grid-template-columns: auto 1fr !important; align-items: start; font-weight: 500 !important; }
.backend-consent input { margin-top: .2rem; }
.contact-backend-consent { display: grid; gap: .55rem; margin-top: .25rem; font-size: .82rem; color: var(--muted-foreground, #666); }
.backend-form-actions { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.backend-form-actions p { margin: 0; color: var(--muted-foreground, #666); }
.backend-form-actions .success { color: inherit; font-weight: 650; }
.backend-form-actions .error,
.contact-form-actions .success,
.contact-form-actions .error,
.backend-notice.error { color: inherit; font-weight: 650; }

#lab-loading { margin: clamp(2rem, 5vw, 4rem); color: var(--muted-foreground, #666); }
.backend-lab { margin: 1.25rem clamp(1rem, 3vw, 2.5rem) 3rem; }
.backend-notice { border: 1px solid var(--border, #d4d4d4); border-radius: 1rem; padding: .9rem 1rem; margin-bottom: 1rem; background: var(--muted, #f4f4f4); }
.backend-notice.success { font-weight: 650; }
.backend-notice a { color: inherit; text-decoration: underline; font-weight: 700; }
.backend-lab-tabs { display: flex; gap: .5rem; flex-wrap: wrap; border-bottom: 1px solid var(--border, #d4d4d4); padding-bottom: .8rem; margin-bottom: 1.25rem; }
.backend-lab-tabs button,
.backend-history-head button,
.backend-history-card button,
.backend-report-links .lab-button {
  border: 1px solid var(--border, #bbb);
  border-radius: 999px;
  background: transparent;
  color: inherit;
  padding: .65rem 1rem;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  text-decoration: none;
}
.backend-lab-tabs button.active { background: var(--foreground, #111); color: var(--background, #fff); }
.backend-site-summary { padding: .8rem 1rem; border-left: 3px solid currentColor; margin-bottom: 1.2rem; color: var(--muted-foreground, #555); }
.backend-job-empty { min-height: 10rem; display: grid; place-content: center; color: var(--muted-foreground, #666); }
.backend-job-status { text-transform: capitalize; }
.backend-lab progress { width: 100%; height: .8rem; accent-color: var(--foreground, #111); }
.backend-metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; margin: 1.25rem 0; }
.backend-metrics article { border: 1px solid var(--border, #d4d4d4); border-radius: 1rem; padding: 1rem; display: grid; gap: .25rem; }
.backend-metrics strong { font-size: 1.35rem; }
.backend-metrics small { color: var(--muted-foreground, #666); }
.backend-report-links { display: flex; gap: .65rem; flex-wrap: wrap; margin-top: 1rem; }
.backend-history-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.backend-history-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .75rem; align-items: center; border-top: 1px solid var(--border, #d4d4d4); padding: 1rem 0; }
.backend-history-card > div:first-child { display: grid; gap: .25rem; }
.backend-history-card small { color: var(--muted-foreground, #666); }
.backend-history-card .backend-report-links { grid-column: 1 / -1; margin-top: 0; }

@media (max-width: 760px) {
  .backend-form-grid,
  .backend-metrics { grid-template-columns: 1fr; }
  .backend-history-card { grid-template-columns: 1fr; }
  .backend-lab { margin-inline: .75rem; }
}