:root{
    --bg:#101214;
    --panel:rgba(0,0,0,.30);
    --line:rgba(255,255,255,.12);
    --text:rgba(255,255,255,.94);
    --muted:rgba(255,255,255,.68);
  }
  *{box-sizing:border-box}
  html,body{
    margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  }
  .seo-visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
  #wrap{position:fixed;inset:0;overflow:hidden;}
  canvas{position:absolute;inset:0;width:100%;height:100%;display:block;background:#171a1d;}
  #ui{
    position:fixed;left:12px;right:12px;bottom:calc(12px + env(safe-area-inset-bottom));
    display:flex;gap:10px;align-items:center;flex-wrap:wrap;z-index:20;
  }
  .btn,.seg,.sliderWrap{
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    background:var(--panel);border:1px solid var(--line);border-radius:999px;color:#fff;
  }
  .btn{
    padding:11px 15px;font-size:13px;cursor:pointer;line-height:1;
  }
  .btn:active{transform:scale(.985)}
  #upload{display:none}
  .seg{display:flex;overflow:hidden}
  .seg button{
    appearance:none;border:none;background:transparent;color:var(--muted);
    padding:10px 14px;font-size:13px;cursor:pointer;
  }
  .seg button.active{color:#fff;background:rgba(255,255,255,.09)}
  .sliderWrap{
    display:flex;align-items:center;gap:10px;padding:7px 12px;
    font-size:12px;color:var(--muted);
  }
  input[type=range]{width:120px;accent-color:#fff}
  .chip{
    padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.07);border:1px solid var(--line);
    font-size:12px;color:var(--muted);
  }
  #status{display:none !important;}
  .spacer{flex:1}

  .demo-back{
    position:fixed;
    left:16px;
    top:calc(16px + env(safe-area-inset-top));
    z-index:30;
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:11px 15px;
    border-radius:999px;
    border:1px solid var(--line);
    background:rgba(0,0,0,.30);
    color:rgba(255,255,255,.92);
    text-decoration:none;
    font-size:13px;
    line-height:1;
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);
    box-shadow:0 12px 36px rgba(0,0,0,.18);
    transition:background .16s ease, transform .16s ease, border-color .16s ease;
  }
  .demo-back:hover{
    background:rgba(255,255,255,.12);
    border-color:rgba(255,255,255,.24);
    transform:translateY(-1px);
  }
  @media (max-width: 800px){
    #ui{gap:8px}
    .sliderWrap{padding:7px 10px}
    input[type=range]{width:96px}
  }