:root, :root.light {
  color-scheme: light dark;

  /* default light mode values */
  --body-bg: #fbfbfc;
  --surface-bg: #ffffff;
  --border-soft: rgba(0, 0, 0, 0.18);
  --muted-soft: rgba(0, 0, 0, 0.55);
  --block-stroke: rgba(180, 180, 180, 1);
  --block-top: #e7e9ee;
  --block-side: #c7ccd5;
  --accent: gray;
  --text-color: black;
  --block-to-block-link-color: black;
  --block-description-link-color: gray;
  --block-description-bg: #f8f9fa;
  --block-miner-color: rgb(122, 122, 122);
  --node-indicatior-stroke: black;

  --tip-status-color-active: #79FF00;
  --tip-status-color-invalid: #CC203B;
  --tip-status-color-valid-fork: #3CACB5;
  --tip-status-color-valid-headers: #FF69B4;
  --tip-status-color-headers-only: #FF8800;
}

/* automatic dark mode */
/* keep the rules in sync with the manual dark mode below! */
@media (prefers-color-scheme: dark) {
  :root {
    --body-bg: #18191c;
    --surface-bg: #232427;
    --border-soft: rgba(255, 255, 255, 0.2);
    --muted-soft: rgba(255, 255, 255, 0.6);
    --block-stroke: rgba(255, 255, 255, 0.28);
    --block-top: #34353c;
    --block-side: #15161a;
    --accent: #f7931a;
    --text-color: white;
    --block-to-block-link-color: white;
    --block-description-link-color: lightgray;
    --block-description-bg: #f8f9fa;
    --node-indicatior-stroke: black;
    --block-miner-color: rgb(172, 172, 172);

    --tip-status-color-active: #79FF00;
    --tip-status-color-invalid: #CC203B;
    --tip-status-color-valid-fork: #3CACB5;
    --tip-status-color-valid-headers: #FF69B4;
    --tip-status-color-headers-only: #FF8800;
  }
  svg.invert, img.invert, .btn-close {
    -webkit-filter: invert(100%); /* safari 6.0 - 9.0 */
    filter: invert(100%);
  }
}

/* manual dark mode */
/* keep the rules in sync with the automatic dark mode above! */
:root.dark {
  --body-bg: #18191c;
  --surface-bg: #232427;
  --border-soft: rgba(255, 255, 255, 0.2);
  --muted-soft: rgba(255, 255, 255, 0.6);
  --block-stroke: rgba(255, 255, 255, 0.28);
  --block-top: #34353c;
  --block-side: #15161a;
  --accent: #f7931a;
  --text-color: white;
  --block-to-block-link-color: white;
  --block-description-link-color: lightgray;
  --block-description-bg: #f8f9fa;
  --node-indicatior-stroke: black;
  --block-miner-color: rgb(172, 172, 172);

  --tip-status-color-active: #79FF00;
  --tip-status-color-invalid: #CC203B;
  --tip-status-color-valid-fork: #3CACB5;
  --tip-status-color-valid-headers: #FF69B4;
  --tip-status-color-headers-only: #FF8800;
  svg.invert, img.invert, .btn-close {
    -webkit-filter: invert(100%); /* safari 6.0 - 9.0 */
    filter: invert(100%);
  }
}

body {
  background: var(--body-bg);
  color: var(--text-color);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.card {
  background: var(--surface-bg);
}

h1, h2, h3, h4, h5, h6, p, label, span, hr, a,
.h1, .h2, .h3, .h4, .h5, .h6 {
  color: var(--text-color);
}

.border {
  border-color: var(--border-soft) !important;
}

.text-muted-soft {
  color: var(--muted-soft) !important;
}

/* let native-styled selects adopt the surface colors */
.form-select {
  background-color: var(--surface-bg);
  color: var(--text-color);
  border-color: var(--border-soft);
  border-radius: 0;
}

.text-color-dark {
  color: black;
}

.link {
  fill: none;
}

path.link.link-block-block {
  stroke: var(--block-to-block-link-color);
  stroke-width: 2px;
  stroke-linejoin: round;
}

path.link.link-block-description {
  stroke: var(--block-description-link-color);
  stroke-width: 1px;
}

text.text-blocks-not-shown {
 fill: var(--text-color);
 text-anchor: middle;
 font-size: 12px;
}

line.countdown-line {
  stroke: var(--text-color);
  stroke-width: 1px;
  stroke-dasharray: 8 6;
}

text.countdown-label {
  fill: var(--text-color);
  font-size: 14px;
}

.countdown-display {
  position: absolute;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--text-color);
  pointer-events: none;
  z-index: 10;
}

rect.block-background {
 fill: var(--surface-bg);
}

/* 3D cube faces behind the front square (fill only; edges drawn once by .block-edges) */
polygon.block-face-top {
 fill: var(--block-top);
}

polygon.block-face-side {
 fill: var(--block-side);
}

/* the cube's top/side/back edges, drawn once so shared edges don't double up */
path.block-edges {
 fill: none;
 stroke: var(--block-stroke);
 stroke-width: 1px;
 stroke-linejoin: round;
}

text.block-text {
 fill: var(--text-color);
 text-anchor: middle;
 font-size: 11px;
}

text.block-miner {
 fill: var(--block-miner-color);
 text-anchor: middle;
 font-size: 10px;
}

rect.block-miner-bg {
 fill: var(--surface-bg);
}

.block {
  cursor: pointer;
}

.block-description {
  cursor: grab;
}

.block-description-background {
  fill: var(--block-description-bg);
  stroke: var(--text-color);
}

/* tip info: stack of colored "Nx status" boxes next to a tip block */
.tip-info-bg {
 stroke: var(--block-stroke);
 stroke-width: 0px;
}

.tip-info-text {
 fill: #1a1a1a;
 font-size: 8px;
 cursor: default;
}

.legend-item {
  color: black;
  padding: 1px 6px;
}

.tip-status-color-background-active { background-color: var(--tip-status-color-active); }
.tip-status-color-background-invalid { background-color: var(--tip-status-color-invalid); color: }
.tip-status-color-background-valid-fork { background-color: var(--tip-status-color-valid-fork); }
.tip-status-color-background-valid-headers { background-color: var(--tip-status-color-valid-headers); }
.tip-status-color-background-headers-only { background-color: var(--tip-status-color-headers-only); }


.tip-status-color-fill-active { fill: var(--tip-status-color-active); color: var(--tip-status-color-active); }
.tip-status-color-fill-invalid { fill: var(--tip-status-color-invalid); color: var(--tip-status-color-invalid); }
.tip-status-color-fill-valid-fork { fill: var(--tip-status-color-valid-fork); color: var(--tip-status-color-valid-fork); }
.tip-status-color-fill-valid-headers { fill: var(--tip-status-color-valid-headers); color: var(--tip-status-color-valid-headers); }
.tip-status-color-fill-headers-only { fill: var(--tip-status-color-headers-only); color: var(--tip-status-color-headers-only); }

#connection-status {
  animation: pulse infinite 5s;
  color: gray;
  vertical-align: text-bottom;
}

@-webkit-keyframes pulse {
  0% {
    opacity: 1;
  }
  40% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
  60% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}

/* ---------------------------------------------------------------------------
   Modern layout
   --------------------------------------------------------------------------- */

.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* compact, sticky top bar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  margin-bottom: 1rem;
  background: color-mix(in srgb, var(--body-bg) 88%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-soft);
}

.app-header .navbar-brand span {
  font-size: 1.25rem;
}

/* toolbar above the visualization: title/description on the left, controls right */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-bottom: 0.75rem;
}

.toolbar-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
}

/* small RSS feed pills */
.feed-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.feed-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.6rem;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--muted-soft);
  border: 1px solid var(--border-soft);
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease;
}

/* square corners everywhere to match the block theme */
.badge {
  border-radius: 0 !important;
}

.feed-pill:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.feed-pill img {
  opacity: 0.7;
}

/* the visualization is the centerpiece: keep it large */
.viz {
  display: block;
  width: 100%;
  height: 78vh;
  background: var(--surface-bg);
}

/* wraps the SVG so the recenter button can float over its corner */
.viz-wrap {
  position: relative;
}

.viz-recenter {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 4px 10px;
  font-size: 0.8rem;
  line-height: 1.2;
  color: var(--accent);
  background: var(--surface-bg);
  border: 1px solid var(--block-stroke);
  cursor: pointer;
}

.viz-recenter:hover {
  border-color: var(--accent);
}

/* fields in the block info card / table that copy to the clipboard on click */
.copyable {
  cursor: pointer;
}

.copyable:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

/* transient confirmation toast (clipboard copy) */
.toast-msg {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--surface-bg);
  background: var(--accent);
  border: 1px solid var(--accent);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 1080;
}

.toast-msg.toast-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* horizontal scroll keeps the node table usable on narrow screens */
.node-table-wrap {
  margin-top: 0.6rem;
  overflow-x: auto;
  border: 1px solid var(--border-soft);
}

@media (max-width: 575.98px) {
  .toolbar-controls {
    width: 100%;
  }
  .viz {
    height: 70vh;
  }
}

/* node table: one node per row */
.node-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-bg);
  font-size: 0.95rem;
}

.node-table thead th {
  position: sticky;
  top: 0;
  background: var(--surface-bg);
  text-align: left;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted-soft);
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-soft);
  white-space: nowrap;
}

.node-table td {
  padding: 0.5rem 0.75rem;
  vertical-align: middle;
  border-bottom: 1px solid var(--border-soft);
}

.node-table tbody tr:last-child td {
  border-bottom: none;
}

.node-row {
  transition: background-color 0.15s ease;
}

.node-row:hover {
  background: color-mix(in srgb, var(--accent) 7%, var(--surface-bg));
}

.nt-name {
  min-width: 12rem;
}

.node-status-dot {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  margin-right: 0.4rem;
  vertical-align: middle;
}

.node-status-dot.is-up {
  background: var(--tip-status-color-active);
}

.node-status-dot.is-down {
  background: var(--tip-status-color-invalid);
}

.nt-name-text {
  font-weight: 600;
  vertical-align: middle;
}

.nt-desc {
  color: var(--muted-soft);
  font-size: 0.82rem;
  margin-top: 0.15rem;
  max-width: 22rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.nt-desc.nt-desc-open {
  white-space: normal;
}

.nt-impl {
  white-space: nowrap;
}

.nt-time {
  white-space: nowrap;
}

.nt-num {
  text-align: left;
}

/* solid color chips: same height -> same height-chip color; same tip -> same
   hash-chip color. hues come from the --height-hue / --hash-hue vars on the row. */
.height-chip,
.hash-chip {
  display: inline-block;
  padding: 0.12rem 0.5rem;
  color: #1a1a1a;
  white-space: nowrap;
}

.height-chip {
  background: hsl(var(--height-hue, 0) 68% 74%);
  font-variant-numeric: tabular-nums;
}

.hash-chip {
  background: hsl(var(--hash-hue, 0) 68% 74%);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  cursor: pointer;
}

.hash-chip:hover {
  filter: brightness(0.95);
}

/* the open block-header info card in the visualization */
.block-info-card {
  border-radius: 0 !important;
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}

.block-info-card .card-header {
  background: var(--body-bg);
  font-weight: 600;
}

/* footer */
.app-footer {
  border-top: 1px solid var(--border-soft);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-color);
}

.footer-link:hover {
  color: var(--accent);
}