:root {
  --g8-bg: #0b1020;
  --g8-panel: rgba(255, 255, 255, 0.06);
  --g8-panel-2: rgba(255, 255, 255, 0.10);
  --g8-text: rgba(255, 255, 255, 0.92);
  --g8-muted: rgba(255, 255, 255, 0.65);
  --g8-accent: #77e3ff;
  --g8-danger: #ff5b6a;
  --g8-border: rgba(255, 255, 255, 0.14);
}

html, body {
  background: radial-gradient(1200px 600px at 20% 0%, rgba(119, 227, 255, 0.20), transparent 55%),
              radial-gradient(900px 600px at 80% 10%, rgba(255, 91, 106, 0.14), transparent 55%),
              var(--g8-bg);
  color: var(--g8-text);
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

#main-content {
  padding: 24px 12px 40px;
}

.g8-shell {
  max-width: 1100px;
  margin: 0 auto;
}

.g8-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 10px 18px;
}

.g8-title {
  margin: 0;
  letter-spacing: -0.02em;
  font-size: 28px;
}

.g8-subtitle {
  margin: 8px 0 0;
  color: var(--g8-muted);
  font-size: 14px;
}

.g8-stats {
  display: flex;
  gap: 10px;
}

.g8-stat {
  background: var(--g8-panel);
  border: 1px solid var(--g8-border);
  border-radius: 12px;
  padding: 8px 10px;
  min-width: 84px;
}

.g8-k {
  display: block;
  font-size: 11px;
  color: var(--g8-muted);
}

.g8-v {
  display: block;
  font-weight: 700;
  font-size: 16px;
}

.g8-main {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 16px;
  align-items: start;
  padding: 0 10px;
}

@media (max-width: 980px) {
  .g8-main {
    grid-template-columns: 1fr;
  }
  .g8-stats {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}

.g8-canvas-wrap {
  position: relative;
  background: var(--g8-panel);
  border: 1px solid var(--g8-border);
  border-radius: 16px;
  overflow: hidden;
  padding: 10px;
}

canvas#g8-canvas {
  width: 100%;
  height: auto;
  display: block;
  background: rgba(0, 0, 0, 0.20);
  border-radius: 12px;
  touch-action: none; /* prevent scroll on swipe */
}

.g8-side {
  display: grid;
  gap: 12px;
}

.g8-panel {
  background: var(--g8-panel);
  border: 1px solid var(--g8-border);
  border-radius: 16px;
  padding: 14px 14px 12px;
}

.g8-panel h3 {
  margin: 0 0 10px;
  font-size: 14px;
}

.g8-panel ul {
  margin: 0;
  padding-left: 18px;
  color: var(--g8-muted);
  font-size: 13px;
  line-height: 1.5;
}

.g8-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 10px 0;
  color: var(--g8-muted);
  font-size: 13px;
}

.g8-row input[type="range"] {
  width: 170px;
}

.g8-row select {
  width: 170px;
  padding: 6px 8px;
  border-radius: 10px;
  border: 1px solid var(--g8-border);
  background: rgba(0,0,0,0.25);
  color: var(--g8-text);
}

.g8-btn {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(119, 227, 255, 0.14);
  color: var(--g8-text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
}

.g8-btn:hover {
  background: rgba(119, 227, 255, 0.20);
}

.g8-btn:active {
  transform: translateY(1px);
}

.g8-btn-secondary {
  background: rgba(255, 255, 255, 0.08);
}

.g8-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
}

.g8-overlay.hidden {
  display: none;
}

.g8-overlay-card {
  width: min(420px, calc(100% - 24px));
  background: rgba(15, 20, 34, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 16px;
  padding: 16px 16px 14px;
}

.g8-overlay-title {
  margin: 0 0 8px;
}

.g8-overlay-msg {
  margin: 0 0 14px;
  color: var(--g8-muted);
}

.g8-overlay-actions {
  display: grid;
  gap: 10px;
}

.g8-overlay-hint {
  margin: 12px 0 0;
  color: rgba(255,255,255,0.55);
  font-size: 12px;
  text-align: center;
}