html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #ccc;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  user-select: none;
  -webkit-user-select: none;
}

#screen {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  cursor: none;
  outline: none;
}

body.modal #screen { cursor: default; }

/* ---------- 设置菜单（DOM 浮层，按时代换皮） ---------- */
#menu {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.72);
  z-index: 10;
  cursor: default;
}
#menu.open { display: flex; }
#menu .panel {
  min-width: 380px;
  max-width: 520px;
  padding: 22px 26px;
  background: #050505;
  border: 1px solid #555;
  color: #ddd;
  font-size: 15px;
  line-height: 1.7;
}
#menu h2 { margin: 0 0 12px; font-size: 20px; font-weight: normal; letter-spacing: 2px; }
#menu .row { display: flex; align-items: center; gap: 12px; margin: 8px 0; }
#menu .row label { width: 92px; flex: none; }
#menu input[type=range] { flex: 1; accent-color: currentColor; }
#menu .btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
#menu button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid currentColor;
  padding: 4px 12px;
  cursor: pointer;
}
#menu button:hover { background: rgba(255, 255, 255, 0.12); }
#menu button.danger { color: #ff7b7b; }
#menu textarea {
  width: 100%;
  box-sizing: border-box;
  height: 90px;
  margin-top: 10px;
  font: 12px Consolas, monospace;
  background: #000;
  color: inherit;
  border: 1px solid #444;
  resize: vertical;
  display: none;
}
#menu textarea.show { display: block; }
#menu .hint { color: #888; font-size: 13px; margin-top: 10px; }
#menu .stats { color: #999; font-size: 13px; margin-top: 8px; white-space: pre-line; }

/* 时代皮肤 */
#menu.skin-0 .panel { font-family: Consolas, "SimHei", monospace; color: #6dff9b; border-color: #2c7a45; background: #010a04; box-shadow: 0 0 24px rgba(60, 255, 120, 0.15); }
#menu.skin-0.mono .panel { color: #d8d8d8; border-color: #666; background: #050505; box-shadow: none; }
#menu.skin-1 .panel { font-family: "Microsoft YaHei UI", sans-serif; font-weight: 300; color: #dff4ff; border-color: #bfe9ff; background: #000; box-shadow: 0 0 18px rgba(170, 225, 255, 0.35); }
#menu.skin-2 .panel { font-family: SimSun, "NSimSun", monospace; font-size: 16px; color: #fcfcfc; background: #000; border: 4px solid #fcfcfc; outline: 4px solid #000; box-shadow: 0 0 0 8px #3cbcfc; }
#menu.skin-3 .panel { font-family: SimSun, "NSimSun", monospace; font-size: 16px; color: #fff8e0; background: linear-gradient(#20306a, #101838); border: 3px solid #e8d8a0; border-radius: 6px; box-shadow: 0 0 0 3px #3a2a10; }
#menu.skin-4 .panel { color: #eef2ff; background: rgba(24, 26, 40, 0.75); backdrop-filter: blur(18px); border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 18px; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(120, 140, 255, 0.15); }
#menu.skin-4 button { border-radius: 10px; border-color: rgba(255, 255, 255, 0.3); }
#menu.skin-5 .panel { color: #e8ecff; background: rgba(6, 8, 20, 0.7); backdrop-filter: blur(10px); border: 1px solid rgba(180, 200, 255, 0.25); border-radius: 4px; }

/* 结局留言输入 */
#letter {
  position: fixed;
  left: 50%;
  top: 62%;
  transform: translate(-50%, -50%);
  width: min(640px, 80vw);
  display: none;
  z-index: 8;
  text-align: center;
}
#letter.open { display: block; }
#letter input {
  width: 100%;
  box-sizing: border-box;
  font: 22px "Microsoft YaHei UI", sans-serif;
  color: #fff;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  outline: none;
  text-align: center;
  padding: 8px 4px;
  caret-color: #fff;
}
#letter .tip { color: rgba(255, 255, 255, 0.55); font-size: 14px; margin-top: 12px; }

/* 调试面板 */
#debug {
  position: fixed;
  right: 6px;
  top: 6px;
  z-index: 20;
  font: 12px Consolas, monospace;
  color: #0f0;
  background: rgba(0, 0, 0, 0.75);
  border: 1px solid #0a0;
  padding: 6px;
  display: none;
  cursor: default;
  max-width: 260px;
}
#debug.open { display: block; }
#debug button { font: inherit; color: #0f0; background: #010; border: 1px solid #0a0; margin: 2px; cursor: pointer; padding: 1px 5px; }
#debug .line { margin: 3px 0; }