:root {
  --bg: #0b0d12;
  --fg: #e8ecf4;
  --dim: #8a93a6;
  --accent: #6f8cff;
  --card: rgba(18, 21, 30, 0.92);
  --line: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 -apple-system, "SF Pro SC", "PingFang SC", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}

#stage { display: block; width: 100vw; height: 100vh; touch-action: none; }

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 35%, #171b26 0%, #0b0d12 70%);
  z-index: 20;
}

.card {
  width: min(88vw, 380px);
  padding: 28px 26px 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
  text-align: center;
  backdrop-filter: blur(12px);
}

.card h1 { margin: 0 0 6px; font-size: 26px; font-weight: 600; letter-spacing: 0.08em; }
.sub { margin: 0 0 20px; color: var(--dim); font-size: 13px; min-height: 20px; }

.buttons { display: grid; gap: 10px; }

button {
  appearance: none;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--fg);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}
button:hover:not(:disabled) { background: rgba(255, 255, 255, 0.1); }
button:disabled { opacity: 0.34; cursor: default; }
button.primary { background: var(--accent); border-color: transparent; color: #fff; font-weight: 500; }
button.primary:hover:not(:disabled) { background: #8099ff; }

.hint { margin: 14px 0 0; color: var(--dim); font-size: 11.5px; line-height: 1.6; }
.hint.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; word-break: break-all; }

.panel {
  position: fixed;
  left: 16px;
  bottom: 16px;
  width: min(90vw, 320px);
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  backdrop-filter: blur(12px);
  z-index: 10;
}

.row { display: flex; align-items: center; gap: 10px; margin-bottom: 9px; }
.row:last-of-type { margin-bottom: 0; }
.label { width: 34px; flex: none; color: var(--dim); font-size: 12px; }
.value { color: var(--fg); font-size: 12px; font-variant-numeric: tabular-nums; }
.row .value:last-child { margin-left: auto; }

input[type="range"] {
  flex: 1;
  appearance: none;
  height: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.16);
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.buttons-row { gap: 8px; margin-top: 12px; }
.buttons-row button { flex: 1; padding: 9px 10px; font-size: 13px; }

.toast {
  position: fixed;
  left: 50%;
  top: 22px;
  transform: translateX(-50%);
  max-width: 86vw;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  font-size: 13px;
  z-index: 30;
  backdrop-filter: blur(12px);
}

.hidden { display: none !important; }