:root {
  --glass: rgba(10, 16, 30, 0.72);
  --glass-brd: rgba(120, 170, 255, 0.28);
  --txt: #e8f0ff;
  --sub: #9fb4d8;
  --acc: #58b0ff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #04060c; }
body {
  font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--txt);
  user-select: none;
}
#gl { position: fixed; inset: 0; width: 100%; height: 100%; display: block; }
#fatal {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: #10131c; color: #ff7b7b; font-size: 18px; z-index: 99; padding: 40px; text-align: center;
}
.hidden { display: none !important; }

/* 顶栏 */
#topbar {
  position: fixed; top: 14px; left: 18px; right: 18px; display: flex; align-items: center;
  gap: 18px; z-index: 10; pointer-events: none;
}
#topbar h1 { font-size: 19px; font-weight: 700; letter-spacing: 1px; text-shadow: 0 2px 12px rgba(0,0,0,.8); }
#topbar h1 span { font-size: 13px; font-weight: 400; color: var(--sub); margin-left: 6px; }
#tabs { display: flex; gap: 8px; pointer-events: auto; }
#tabs button {
  background: var(--glass); border: 1px solid var(--glass-brd); color: var(--txt);
  padding: 8px 16px; border-radius: 999px; font-size: 14px; cursor: pointer;
  backdrop-filter: blur(10px); transition: all .18s;
}
#tabs button:hover { border-color: var(--acc); }
#tabs button.active { background: linear-gradient(135deg, rgba(88,176,255,.35), rgba(140,110,255,.3)); border-color: var(--acc); box-shadow: 0 0 18px rgba(88,176,255,.35); }

/* 底部面板 */
#panel {
  position: fixed; left: 50%; bottom: 14px; transform: translateX(-50%);
  width: min(880px, calc(100vw - 28px));
  background: var(--glass); border: 1px solid var(--glass-brd); border-radius: 16px;
  backdrop-filter: blur(14px); padding: 12px 16px 14px; z-index: 10;
  box-shadow: 0 8px 32px rgba(0,0,0,.45);
}
#item-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
#item-bar .label { font-size: 12px; color: var(--sub); margin-right: 6px; white-space: nowrap; }
#item-bar .item {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  background: rgba(255,255,255,.06); border: 1px solid transparent; border-radius: 12px;
  padding: 6px 12px; cursor: pointer; color: var(--txt); min-width: 66px;
  transition: all .15s; font-family: inherit;
}
#item-bar .item .emoji { font-size: 24px; line-height: 1.1; filter: drop-shadow(0 2px 4px rgba(0,0,0,.5)); }
#item-bar .item .nm { font-size: 12px; color: var(--sub); }
#item-bar .item:hover { border-color: var(--glass-brd); background: rgba(255,255,255,.1); }
#item-bar .item.active { border-color: var(--acc); background: rgba(88,176,255,.22); box-shadow: 0 0 14px rgba(88,176,255,.3); }
#item-bar .item.active .nm { color: #fff; }

#sliders { display: flex; gap: 18px; margin-top: 10px; flex-wrap: wrap; }
#sliders .row { flex: 1; min-width: 200px; }
#sliders label { font-size: 12px; color: var(--sub); display: block; margin-bottom: 4px; }
#sliders label b { color: var(--acc); font-size: 13px; }
#sliders input[type=range] { width: 100%; accent-color: var(--acc); cursor: pointer; }

#info {
  margin-top: 10px; font-size: 12px; line-height: 1.7; color: var(--sub);
  border-top: 1px solid rgba(120,170,255,.15); padding-top: 8px;
}

/* HUD（左上读数） */
#hud {
  position: fixed; top: 66px; left: 18px; z-index: 9; font-size: 12.5px; line-height: 1.9;
  color: #eaf3ff; background: var(--glass); border: 1px solid var(--glass-brd);
  border-radius: 12px; padding: 10px 14px; backdrop-filter: blur(10px);
  text-shadow: 0 1px 4px rgba(0,0,0,.6); max-width: 420px;
}

/* 地面视图按钮 */
#ground-btns {
  position: fixed; right: 18px; bottom: 18px; z-index: 10; display: flex; gap: 8px;
}
#ground-btns button {
  background: var(--glass); border: 1px solid var(--glass-brd); color: var(--txt);
  padding: 9px 14px; border-radius: 999px; font-size: 13px; cursor: pointer;
  backdrop-filter: blur(10px); transition: all .18s;
}
#ground-btns button:hover { border-color: var(--acc); }

#hint {
  position: fixed; bottom: 12px; left: 50%; transform: translateX(-50%);
  font-size: 11px; color: rgba(220,235,255,.55); z-index: 5; pointer-events: none;
  text-shadow: 0 1px 6px rgba(0,0,0,.8); white-space: nowrap;
}
@media (max-width: 720px) {
  #hint { display: none; }
  #hud { max-width: calc(100vw - 36px); font-size: 11.5px; }
  #topbar h1 span { display: none; }
}