:root {
  --bg: #0d1117;
  --bg-raised: #151b23;
  --bg-inset: #0a0e14;
  --border: #262d38;
  --border-soft: #1d232c;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --text-faint: #5a6472;
  --green: #3fb950;
  --green-dim: #1f4a2a;
  --orange: #e3922a;
  --orange-dim: #4d3313;
  --blue: #4b8ed8;
  --red: #f85149;
  --red-dim: #3d1618;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-raised);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
  align-self: center;
}

.brand h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand-sub {
  color: var(--text-faint);
  font-size: 12px;
}

.topbar-meta {
  display: flex;
  gap: 22px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 1px;
  font-family: var(--mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.meta-label {
  font-family: inherit;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}

/* ---------- tabs ---------- */

.tabs {
  display: flex;
  gap: 2px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-raised);
}

.tab {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  padding: 10px 14px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: -1px;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  color: var(--text);
  border-bottom-color: var(--blue);
}

.tab-badge {
  background: var(--red);
  color: #fff;
  border-radius: 9px;
  padding: 0 6px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--mono);
}

main {
  padding: 20px 24px 40px;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

/* ---------- banners ---------- */

.banner {
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 13px;
}

.banner-alert {
  background: var(--red-dim);
  border: 1px solid var(--red);
  color: #ffc9c6;
}

/* ---------- client cards ---------- */

.clients {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(520px, 1fr));
  gap: 16px;
}

.client-card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.client-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--border-soft);
}

.client-name {
  font-weight: 600;
  font-size: 14px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-faint);
  flex: none;
}

.status-dot.up {
  background: var(--green);
  box-shadow: 0 0 8px rgba(63, 185, 80, 0.6);
}

.status-dot.down {
  background: var(--red);
  box-shadow: 0 0 8px rgba(248, 81, 73, 0.6);
}

.client-version {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  text-decoration: none;
  white-space: nowrap;
}

.client-version:hover {
  color: var(--text);
  border-color: var(--blue);
}

.client-head-meta {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}

/* ---------- planned clients ---------- */

.planned {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.planned-card {
  background: var(--bg-raised);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 13px 16px;
  opacity: 0.65;
}

.planned-head {
  display: flex;
  align-items: center;
  gap: 9px;
}

.planned-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-dim);
}

.planned-note {
  margin-top: 3px;
  margin-left: 17px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}

.client-error {
  padding: 8px 16px;
  background: var(--red-dim);
  border-bottom: 1px solid var(--border-soft);
  color: #ffc9c6;
  font-family: var(--mono);
  font-size: 11px;
  word-break: break-word;
}

/* ---------- metric rows ---------- */

.metrics {
  display: flex;
  flex-direction: column;
}

.metric {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--border-soft);
}

.metric-tag {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
}

.metric-tag i {
  width: 7px;
  height: 7px;
  border-radius: 2px;
  flex: none;
}

.metric-tag.safe i {
  background: var(--green);
}
.metric-tag.finalized i {
  background: var(--orange);
}
.metric-tag.latest i {
  background: var(--blue);
}

.metric-value {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.metric-number {
  font-family: var(--mono);
  font-size: 19px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.metric-hash {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  cursor: copy;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.metric-hash:hover {
  color: var(--text-dim);
}

.metric-side {
  text-align: right;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  line-height: 1.4;
  white-space: nowrap;
}

.metric-side b {
  display: block;
  color: var(--text-dim);
  font-weight: 400;
}

/* ---------- slot grid ---------- */

.grid-wrap {
  padding: 14px 16px 16px;
  overflow-x: auto;
}

.epoch-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.epoch-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-faint);
  width: 62px;
  flex: none;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.slots {
  display: grid;
  grid-auto-flow: column;
  gap: 2px;
}

.slot {
  display: block;
  width: 11px;
  height: 15px;
  border-radius: 2px;
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  cursor: pointer;
  transition:
    transform 90ms ease,
    box-shadow 90ms ease;
}

.slot:hover,
.slot:focus-visible {
  transform: scale(1.25);
  box-shadow: 0 0 0 1px var(--text);
  outline: none;
}

.slot.finalized {
  background: var(--orange);
  border-color: var(--orange);
}

.slot.safe {
  background: var(--green);
  border-color: var(--green);
}

.slot.proposed {
  background: var(--blue);
  border-color: var(--blue);
  opacity: 0.55;
}

.slot.pending {
  background: var(--border);
  border-color: var(--border);
}

.slot.current {
  border-color: var(--text);
}

.slot.reorged {
  background: var(--red);
  border-color: var(--red);
}

/* ---------- legend ---------- */

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 18px;
  font-size: 11px;
  color: var(--text-faint);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  border: 1px solid var(--border-soft);
  flex: none;
}

.swatch-finalized {
  background: var(--orange);
  border-color: var(--orange);
}
.swatch-safe {
  background: var(--green);
  border-color: var(--green);
}
.swatch-proposed {
  background: var(--blue);
  border-color: var(--blue);
  opacity: 0.55;
}
.swatch-pending {
  background: var(--border);
  border-color: var(--border);
}
.swatch-future {
  background: var(--bg-inset);
}

/* ---------- reorg tab ---------- */

.empty-state {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-raised);
  padding: 48px 24px;
  text-align: center;
}

.empty-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--green);
  color: var(--green);
  display: grid;
  place-items: center;
  margin: 0 auto 16px;
  font-size: 20px;
}

.empty-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.empty-sub {
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 12px;
}

.reorg-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.reorg-card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-left: 3px solid var(--red);
  border-radius: 6px;
  padding: 14px 16px;
}

.reorg-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.reorg-type {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--red-dim);
  border: 1px solid var(--red);
  color: #ffc9c6;
  border-radius: 4px;
  padding: 1px 7px;
}

.reorg-client {
  font-weight: 600;
}

.reorg-when {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}

.reorg-note {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 12px;
}

.reorg-hashes {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 4px 14px;
  font-family: var(--mono);
  font-size: 11px;
}

.reorg-hashes dt {
  color: var(--text-faint);
}

.reorg-hashes dd {
  margin: 0;
  word-break: break-all;
}

.hash-old {
  color: var(--orange);
}
.hash-new {
  color: var(--red);
}

/* ---------- reference tab ---------- */

.reference {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 26px;
  max-width: 720px;
}

.reference h2 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
}

.reference h3 {
  margin: 26px 0 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.reference p {
  margin: 0 0 10px;
  color: var(--text-dim);
  line-height: 1.65;
}

.reference-aside {
  color: var(--text-faint) !important;
  font-size: 13px;
}

.reference-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.reference-links li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 11px 14px;
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
}

.reference-links a {
  color: var(--blue);
  text-decoration: none;
  font-size: 14px;
}

.reference-links a:hover {
  text-decoration: underline;
}

.reference-links span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}

/* ---------- footer ---------- */

.footer {
  padding: 12px 24px 24px;
  color: var(--text-faint);
  font-size: 11px;
  font-family: var(--mono);
  display: flex;
  gap: 8px;
  align-items: center;
}

.footer a {
  color: var(--text-faint);
}

.footer-sep {
  opacity: 0.5;
}

/* ---------- responsive ---------- */

/*
 * Grid items default to min-width:auto, so a card would refuse to shrink below
 * the slot grid's intrinsic width and push the whole page into horizontal
 * scroll. Collapsing the floor lets the card track the viewport instead.
 */
.client-card {
  min-width: 0;
}

@media (max-width: 1100px) {
  .clients {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar,
  .tabs,
  main,
  .footer {
    padding-left: 14px;
    padding-right: 14px;
  }

  .topbar-meta {
    gap: 16px;
  }

  /*
   * Fixed 11px cells cannot fit 32 slots on a phone. Rather than hide the
   * epoch behind a sideways scroll, let the cells divide the available width
   * so a whole epoch stays visible at a glance -- which is the point of the
   * view. The label moves above the row to reclaim its 72px.
   */
  .grid-wrap {
    overflow-x: visible;
    padding: 12px 14px 14px;
  }

  .epoch-row {
    display: block;
    margin-bottom: 8px;
  }

  .epoch-label {
    width: auto;
    text-align: left;
    margin-bottom: 3px;
  }

  .slots {
    grid-auto-columns: minmax(0, 1fr);
    gap: 1px;
  }

  .slot {
    width: auto;
    height: 18px;
  }

  /* Value and slot/epoch detail stack instead of competing for one row. */
  .metric {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 4px 10px;
    padding: 10px 14px;
  }

  .metric-number {
    font-size: 17px;
  }

  .metric-side {
    grid-column: 2;
    text-align: left;
    display: flex;
    flex-wrap: wrap;
    gap: 4px 12px;
  }

  .metric-side b {
    display: inline;
  }

  .client-head {
    flex-wrap: wrap;
    row-gap: 2px;
  }

  .client-head-meta {
    margin-left: 0;
    flex-basis: 100%;
  }

  .reorg-hashes {
    grid-template-columns: 1fr;
    gap: 0 0;
  }

  .reorg-hashes dt {
    margin-top: 6px;
  }

  .reorg-when {
    margin-left: 0;
    flex-basis: 100%;
  }

  .legend {
    gap: 10px 14px;
  }
}