:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-hover: #243044;
  --border: #2d3a4d;
  --text: #e7ecf3;
  --muted: #8b9cb3;
  --accent: #4d9fff;
  --accent-dim: #2a6fbf;
  --success: #3ecf8e;
  --warn: #f0b429;
  --error: #f07178;
  --radius: 10px;
  --font: "SF Pro Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "SF Mono", "Consolas", "Liberation Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font: 15px/1.55 var(--font);
  color: var(--text);
  background: radial-gradient(1200px 800px at 20% -10%, #1a2a44 0%, var(--bg) 55%);
}

.demo-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.demo-header {
  margin-bottom: 24px;
}

.demo-header h1 {
  margin: 0 0 8px;
  font-size: 1.65rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.demo-header p {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
}

.demo-badge {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(77, 159, 255, 0.12);
  border: 1px solid rgba(77, 159, 255, 0.35);
  border-radius: 999px;
}

.demo-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 900px) {
  .demo-grid--split {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.demo-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.demo-panel h2 {
  margin: 0 0 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.demo-panel--wide {
  grid-column: 1 / -1;
}

.demo-panel--wide > .demo-grid {
  gap: 20px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  background: rgba(0, 0, 0, 0.15);
  transition: border-color 0.15s, background 0.15s;
  cursor: pointer;
}

.dropzone:hover,
.dropzone:focus-within,
.dropzone--drag {
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.06);
}

.dropzone strong {
  display: block;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.dropzone span {
  font-size: 0.85rem;
  color: var(--muted);
}

.dropzone input[type="file"] {
  position: absolute;
  width: 0.1px;
  height: 0.1px;
  opacity: 0;
  overflow: hidden;
  z-index: -1;
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: #2c3d54;
  border-color: var(--accent-dim);
}

.btn--primary {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.demo-status {
  margin-top: 14px;
  padding: 10px 12px;
  font-size: 0.85rem;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  color: var(--muted);
}

.demo-status--busy {
  color: var(--warn);
  border-color: rgba(240, 180, 41, 0.35);
}

.demo-status--done {
  color: var(--success);
  border-color: rgba(62, 207, 142, 0.35);
}

.demo-status--error {
  color: var(--error);
  border-color: rgba(240, 113, 120, 0.35);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.metric {
  padding: 10px 12px;
  background: rgba(0, 0, 0, 0.18);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.metric dt {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.metric dd {
  margin: 4px 0 0;
  font-size: 1.05rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.table-wrap {
  overflow: auto;
  max-height: min(420px, 50vh);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 8px;
}

table.demo-events {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

table.demo-events th,
table.demo-events td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

table.demo-events th {
  position: sticky;
  top: 0;
  background: var(--surface-hover);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  z-index: 1;
}

table.demo-events tbody tr {
  cursor: pointer;
  transition: background 0.1s;
}

table.demo-events tbody tr:hover {
  background: rgba(77, 159, 255, 0.08);
}

table.demo-events tbody tr.is-selected {
  background: rgba(77, 159, 255, 0.16);
}

table.demo-events .col-idx {
  width: 48px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

table.demo-events .col-sum {
  font-family: var(--mono);
  font-size: 0.78rem;
  word-break: break-all;
}

pre.demo-json {
  margin: 0;
  padding: 14px;
  max-height: min(480px, 55vh);
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-word;
}

.demo-json {
  margin: 0;
  padding: 14px;
  max-height: min(480px, 55vh);
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  border: 1px solid var(--border);
  white-space: normal;
}

.inspect-toolbar {
  display: flex;
  gap: 8px;
  margin: -2px 0 10px;
}

.inspect-toolbar .btn {
  padding: 5px 10px;
  font-size: 0.75rem;
}

.inspect-block {
  margin: 0;
}

.inspect-block > summary {
  cursor: pointer;
  color: var(--accent);
  user-select: none;
  margin: 0 0 4px;
}

.inspect-body {
  margin-left: 12px;
  border-left: 1px dashed var(--border);
  padding-left: 10px;
}

.inspect-row {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  margin: 3px 0;
}

.inspect-key {
  color: #9ec6ff;
  white-space: nowrap;
  flex: 0 0 auto;
}

.inspect-row > :not(.inspect-key) {
  flex: 1 1 auto;
  min-width: 0;
  align-self: flex-start;
}

.inspect-row > .inspect-block {
  width: 100%;
}

.inspect-string {
  color: #e9c46a;
}

.inspect-null {
  color: var(--muted);
}

.inspect-binary {
  margin: 4px 0 6px;
}

.inspect-hex {
  margin: 6px 0;
  padding: 8px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--border);
  border-radius: 6px;
  white-space: pre-wrap;
  word-break: break-all;
}

.inspect-more {
  margin-top: 4px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-hover);
  color: var(--text);
  font: inherit;
  font-size: 0.74rem;
  cursor: pointer;
}

.inspect-more:hover {
  border-color: var(--accent);
}

.demo-hint {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--muted);
}

.demo-hint code {
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 1px 6px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 4px;
}