:root {
  --bg: #101418;
  --bg-panel: #171d24;
  --bg-input: #0c1014;
  --border: #2a333e;
  --text: #d7dee6;
  --text-dim: #8a96a3;
  --accent: #4fd1c5;
  --accent-dim: #2c6f68;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px 28px 10px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 2px;
  font-weight: 800;
}

header .accent { color: var(--accent); }

header .title p {
  margin: 2px 0 0;
  color: var(--text-dim);
  font-size: 13px;
}

header .meta {
  display: flex;
  gap: 18px;
  align-items: baseline;
  font-size: 13px;
  color: var(--text-dim);
}

header .meta a {
  color: var(--accent);
  text-decoration: none;
}

main {
  display: flex;
  gap: 20px;
  padding: 20px 28px 32px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.stage {
  flex: 1 1 620px;
  min-width: 320px;
}

.canvas-wrap {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #000;
}

canvas#view {
  display: block;
  width: 100%;
  height: auto;
  cursor: crosshair;
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  justify-content: center;
  background: rgba(16, 20, 24, 0.88);
  transition: opacity 0.3s;
}

.overlay.hidden { opacity: 0; pointer-events: none; }

.overlay p { color: var(--text-dim); font-size: 13px; margin: 0; }

.spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--accent-dim);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.statusbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-dim);
}

#status { min-width: 200px; }
#status.error { color: #fc8181; }

.progress {
  flex: 1;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  overflow: hidden;
}

#progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.15s ease;
}

.hint {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.8;
}

kbd {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 11px;
  font-family: inherit;
}

.panel {
  flex: 0 1 300px;
  min-width: 260px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.group {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}

.group label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.group select {
  width: 100%;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 14px;
  outline: none;
}

.group select:focus { border-color: var(--accent); }

.row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.description {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
  min-height: 2.5em;
}

.toggles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 10px;
}

.toggles label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  margin: 4px 0 0;
  cursor: pointer;
}

.toggles input { accent-color: var(--accent); }

/* advanced panel */

.advanced summary {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}

.advanced summary::marker { color: var(--accent); }

.advanced[open] summary { margin-bottom: 10px; }

.slider-row {
  display: grid;
  grid-template-columns: 1fr 84px 34px;
  align-items: center;
  gap: 8px;
  margin: 7px 0;
}

.slider-row label {
  font-size: 12.5px;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slider-row input[type="range"] {
  width: 100%;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-input);
  border-radius: 2px;
  outline: none;
  padding: 0;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.slider-row input[type="range"]::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.slider-row .value {
  font-size: 12px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.actions { display: flex; flex-direction: column; gap: 8px; }

.actions button {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.actions button:hover { border-color: var(--accent); color: var(--accent); }

.panel footer p {
  margin: 0;
  font-size: 11.5px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* benchmark page */

.scoreboard {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-top: 14px;
  padding: 16px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.score-big {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

#score-value {
  font-size: 44px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.score-unit {
  color: var(--text-dim);
  font-size: 14px;
}

.score-details {
  font-size: 12.5px;
  color: var(--text-dim);
  text-align: center;
}

.checkline {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  cursor: pointer;
}

.checkline input { accent-color: var(--accent); }

.actions button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 600;
}

.actions button.primary:hover { color: var(--bg); opacity: 0.9; }

.actions button.subtle {
  font-size: 12px;
  padding: 6px 10px;
  color: var(--text-dim);
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11.5px;
  color: var(--text-dim);
}

.history-table th, .history-table td {
  text-align: left;
  padding: 3px 6px 3px 0;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.history-table th { color: var(--text-dim); font-weight: 600; }
.history-table td:last-child { color: var(--accent); font-weight: 600; }

@media (max-width: 900px) {
  main { padding: 14px; }
  .panel { flex: 1 1 100%; }
  header { padding: 14px 16px 8px; }
}