:root {
  --bg: #0b0f1a;
  --panel: rgba(18, 24, 40, 0.92);
  --accent: #4fd1ff;
  --accent-2: #ff5d8f;
  --text: #e8eefc;
  --muted: #93a0c0;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

#game-shell {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(120% 80% at 50% -10%, #16203a 0%, var(--bg) 60%);
}

#stage {
  position: relative;
  width: min(100vw, 56.25vh); /* 9:16 竖屏 */
  height: min(177.78vw, 100vh);
  max-width: 540px;
  max-height: 960px;
  box-shadow: 0 0 60px rgba(79, 209, 255, 0.08), 0 0 0 1px rgba(255,255,255,0.04);
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #070a12;
  border-radius: 14px;
}

/* 右上角自动移动开关 */
.auto-toggle {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 6;
  padding: 6px 12px;
  min-width: 58px;
  font-size: 12px;
  font-weight: 700;
  font-family: inherit;
  color: var(--muted);
  background: rgba(8, 12, 22, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  cursor: pointer;
  pointer-events: auto;
  transition: all 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}
.auto-toggle:hover { border-color: rgba(124, 192, 252, 0.6); color: var(--text); }
.auto-toggle.on {
  color: #06121f;
  background: linear-gradient(135deg, #4fd1ff, #74c0fc);
  border-color: transparent;
  box-shadow: 0 0 14px rgba(79, 209, 255, 0.5);
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 9, 18, 0.72);
  backdrop-filter: blur(6px);
  border-radius: 14px;
  z-index: 5;
  padding: 18px;
}

.overlay.hidden { display: none; }

.panel {
  width: 100%;
  max-width: 420px;
  background: var(--panel);
  border: 1px solid rgba(79, 209, 255, 0.18);
  border-radius: 18px;
  padding: 28px 22px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  font-size: 13px;
  letter-spacing: 6px;
  color: var(--muted);
  margin: 4px 0 18px;
}

.desc {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 22px;
}

.btn {
  display: inline-block;
  width: 100%;
  padding: 14px 18px;
  margin: 8px 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.2s ease;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(90deg, var(--accent), #3aa0ff);
  border: none;
  color: #04121f;
}

.hint {
  margin-top: 18px;
  font-size: 12px;
  line-height: 1.9;
  color: var(--muted);
}

.stats {
  font-size: 15px;
  line-height: 2;
  color: var(--text);
  margin-bottom: 20px;
}
.stats b { color: var(--accent); }