.support-frame {
  grid-template-columns: repeat(12, 1fr);
}

.support-page-card {
  grid-column: 1 / span 12;
  padding: 28px 32px;
  box-shadow: 0 1px 3px var(--panel-shadow);
}

.support-page-nav {
  margin-bottom: 16px;
}

.support-active-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin: 20px 0;
  padding: 16px;
  border: 1px solid var(--divider);
  border-radius: 12px;
  background: var(--surface-elevated, rgba(0, 0, 0, 0.03));
}

.support-color-swatch {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--divider);
  flex-shrink: 0;
}

.support-color-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 18px;
  font-weight: 600;
}

.support-consent-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 16px 0;
  font-size: 14px;
}

.support-thread {
  display: grid;
  gap: 10px;
  margin: 16px 0;
  max-height: 360px;
  overflow-y: auto;
}

.support-message {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--divider);
  max-width: 85%;
}

.support-message.user {
  margin-right: auto;
  background: rgba(79, 140, 255, 0.08);
}

.support-message.admin {
  margin-left: auto;
  background: rgba(62, 207, 142, 0.08);
}

.support-message-meta {
  font-size: 12px;
  color: var(--text-muted, #6b7280);
  margin-bottom: 6px;
}

.support-compose {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.support-history-section {
  margin-top: 32px;
}

.support-sheet {
  border: 1px solid var(--divider);
  border-radius: 12px;
  overflow: hidden;
}

.support-sheet-head,
.support-sheet-row {
  display: grid;
  grid-template-columns: minmax(140px, 1.4fr) 72px 88px 40px 72px;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
}

.support-sheet-head {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted, #6b7280);
  background: var(--surface-elevated, rgba(0, 0, 0, 0.03));
  border-bottom: 1px solid var(--divider);
}

.support-sheet-row {
  border-bottom: 1px solid var(--divider);
  cursor: pointer;
}

.support-sheet-row:last-child {
  border-bottom: none;
}

.support-sheet-row:hover {
  background: var(--surface-elevated, rgba(0, 0, 0, 0.03));
}

.support-sheet-row.is-expanded {
  background: var(--surface-elevated, rgba(0, 0, 0, 0.04));
}

.support-color-bar {
  width: 32px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.support-row-detail {
  grid-column: 1 / -1;
  padding: 0 14px 12px;
}

.support-reopen-btn {
  margin-top: 8px;
}

.support-stale-notice {
  margin-bottom: 16px;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--divider);
  background: var(--surface-elevated, rgba(0, 0, 0, 0.03));
}

@media (max-width: 768px) {
  .support-sheet-head,
  .support-sheet-row {
    grid-template-columns: minmax(0, 1.4fr) 56px 72px 32px 64px;
    font-size: 13px;
    gap: 8px;
    padding: 10px;
  }
}

@media (max-width: 480px) {
  .support-page-card {
    padding: 20px 16px;
  }

  .support-active-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .support-sheet-head,
  .support-sheet-row {
    grid-template-columns: 1fr 48px;
    grid-template-rows: auto auto;
  }

  .support-sheet-head span:nth-child(n + 3),
  .support-sheet-row span:nth-child(n + 3) {
    display: none;
  }
}