:root {
  --nkb-ink: #1a1c1a;
  --nkb-muted: #5d6470;
  --nkb-line: rgba(32, 27, 20, 0.08);
  --nkb-line-strong: rgba(32, 27, 20, 0.14);
  --nkb-surface: rgba(255, 252, 248, 0.96);
  --nkb-surface-soft: rgba(244, 243, 241, 0.92);
  --nkb-surface-strong: #ffffff;
  --nkb-primary: #001f3f;
  --nkb-success: #2f7c56;
  --nkb-danger: #ba1a1a;
  --nkb-accent: #b57944;
  --nkb-shadow: 0 12px 32px rgba(0, 6, 19, 0.06);
  --nkb-radius: 18px;
  --nkb-radius-sm: 12px;
  --nkb-mono: "SFMono-Regular", Consolas, monospace;
}

.hidden {
  display: none !important;
}

.status-text {
  min-height: 18px;
  font-size: 12px;
  line-height: 1.45;
  color: var(--nkb-muted);
}

.status-text.error {
  color: var(--nkb-danger);
}

.status-text.success {
  color: var(--nkb-success);
}

.tab-button.active {
  opacity: 1 !important;
  background: #ffffff !important;
  color: var(--nkb-primary) !important;
  border-color: var(--nkb-primary) !important;
  box-shadow: 0 10px 24px rgba(0, 31, 63, 0.08);
}

[data-usage-window].active {
  background: #e9e8e5 !important;
  color: var(--nkb-primary) !important;
}

.human-check-shell {
  display: grid;
  gap: 8px;
}

.human-check-frame {
  min-height: 84px;
  padding: 10px 12px;
  border-radius: var(--nkb-radius);
  border: 1px solid var(--nkb-line);
  background: var(--nkb-surface-strong);
  display: grid;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.human-check-frame > div,
.human-check-frame iframe {
  max-width: 100%;
}

.detail-list,
.device-list,
.ledger-list,
.session-list,
.log-list {
  display: grid;
  gap: 12px;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 14px;
  border-radius: var(--nkb-radius-sm);
  border: 1px solid var(--nkb-line);
  background: var(--nkb-surface);
}

.detail-row strong {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nkb-muted);
}

.detail-row span {
  color: var(--nkb-ink);
  font-size: 14px;
  text-align: right;
  word-break: break-word;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(32, 27, 20, 0.06);
  color: var(--nkb-muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tag.ok {
  background: rgba(47, 124, 86, 0.12);
  color: var(--nkb-success);
}

.tag.bad {
  background: rgba(186, 26, 26, 0.12);
  color: var(--nkb-danger);
}

.ledger-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.device-item,
.session-item,
.log-item,
.ledger-row {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--nkb-radius);
  border: 1px solid var(--nkb-line);
  background: var(--nkb-surface);
  box-shadow: var(--nkb-shadow);
}

.device-item header,
.session-item header,
.ledger-row header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.device-item strong,
.session-item strong,
.ledger-row strong {
  font-size: 14px;
  color: var(--nkb-ink);
}

.device-item small,
.session-item small,
.ledger-row small,
.log-item small {
  color: var(--nkb-muted);
  font-size: 12px;
}

.device-item small + small,
.session-item small + small {
  margin-top: -4px;
}

.ledger-row {
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.ledger-row:hover {
  transform: translateY(-1px);
  border-color: rgba(0, 31, 63, 0.18);
}

.ledger-row.selected {
  border-color: rgba(0, 31, 63, 0.3);
  background: linear-gradient(180deg, rgba(225, 236, 247, 0.72), rgba(255, 251, 245, 0.96));
}

.ledger-row-title {
  display: grid;
  gap: 4px;
}

.ledger-row-title strong {
  color: var(--nkb-primary);
}

.ledger-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.mini-stat {
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 14px;
  background: var(--nkb-surface-soft);
  border: 1px solid rgba(32, 27, 20, 0.06);
}

.mini-stat strong {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nkb-muted);
}

.mini-stat span {
  font-size: 13px;
  font-weight: 700;
  color: var(--nkb-ink);
}

.ledger-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.compact-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--nkb-line-strong);
  background: rgba(255, 255, 255, 0.78);
  color: var(--nkb-ink);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
}

.compact-button.primary {
  background: rgba(0, 31, 63, 0.1);
  color: var(--nkb-primary);
}

.compact-button.danger {
  color: var(--nkb-danger);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.meta-grid article {
  padding: 14px 16px;
  border-radius: var(--nkb-radius);
  border: 1px solid var(--nkb-line);
  background: var(--nkb-surface);
}

.meta-grid strong {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nkb-muted);
}

.meta-grid span {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  color: var(--nkb-ink);
  word-break: break-word;
}

.table-wrapper {
  overflow: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 12px 10px;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nkb-muted);
  border-bottom: 1px solid var(--nkb-line);
}

.data-table td {
  font-size: 13px;
  border-bottom: 1px solid rgba(32, 27, 20, 0.06);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.chart-shell {
  display: grid;
  gap: 10px;
}

.chart-frame {
  position: relative;
  min-height: 320px;
  padding: 20px 16px 10px 56px;
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(245, 239, 230, 0.72));
  border: 1px solid var(--nkb-line);
}

.chart-y-axis {
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 32px;
  width: 52px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-end;
  padding-right: 12px;
  color: var(--nkb-muted);
  font-size: 11px;
}

.chart-grid-lines {
  position: absolute;
  inset: 18px 16px 32px 56px;
  display: grid;
  grid-template-rows: repeat(4, 1fr);
}

.chart-grid-lines span {
  border-top: 1px solid rgba(32, 27, 20, 0.08);
}

.chart-bars {
  position: relative;
  z-index: 1;
  min-height: 260px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22px, 1fr));
  gap: 8px;
  align-items: end;
}

.chart-column {
  display: grid;
  gap: 8px;
  align-items: end;
  justify-items: center;
}

.chart-bar-rail {
  width: 100%;
  height: 220px;
  display: flex;
  align-items: end;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(0, 31, 63, 0.04), rgba(0, 31, 63, 0.12));
  overflow: hidden;
}

.chart-bar-fill {
  width: 100%;
  height: var(--chart-bar-height, 0%);
  min-height: 0;
  border-radius: 999px;
  background: linear-gradient(180deg, #d4ad83, var(--nkb-accent));
  transition: height 180ms ease;
}

.chart-bar-value,
.chart-bar-label {
  font-size: 11px;
  color: var(--nkb-muted);
}

.chart-bar-value {
  font-weight: 700;
  color: var(--nkb-ink);
}

.mono {
  font-family: var(--nkb-mono);
  font-size: 11px;
  white-space: pre-wrap;
  word-break: break-word;
}

.log-item .mono {
  padding: 10px 12px;
  border-radius: var(--nkb-radius-sm);
  background: rgba(0, 31, 63, 0.06);
}

.empty {
  padding: 18px;
  border-radius: var(--nkb-radius);
  border: 1px dashed rgba(32, 27, 20, 0.16);
  color: var(--nkb-muted);
  background: rgba(255, 255, 255, 0.55);
}

@media (max-width: 900px) {
  .ledger-summary,
  .meta-grid {
    grid-template-columns: 1fr;
  }
}