:root{
    --panel:rgba(12,18,28,.78);
    --line:rgba(120,170,255,.20);
    --txt:#e9eefc;
    --dim:#8ea3c6;
    --ok:#38e08a;
    --warn:#ffb648;
    --bad:#ff5d6c;
  }
  *{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
  html,body{margin:0;height:100%;overflow:hidden;background:#0a0f18;color:var(--txt);
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
    user-select:none;-webkit-user-select:none;
    position:fixed;inset:0;width:100%;touch-action:none;overscroll-behavior:none;
    -webkit-overflow-scrolling:auto}
  #scene{display:block;position:fixed;inset:0;width:100%;height:100%;touch-action:none}

  .hud{position:fixed;left:12px;top:calc(12px + env(safe-area-inset-top));z-index:6;pointer-events:none}
  .card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:9px 12px;
    backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);min-width:150px;
    box-shadow:0 8px 24px rgba(0,0,0,.4)}
  .card .tt{font-size:11px;letter-spacing:.14em;color:#7ea2d6;margin-bottom:3px}
  .grid{display:grid;grid-template-columns:auto auto;gap:0 10px;font-size:12px;color:var(--dim)}
  .grid b{color:#e9eefc;font-weight:650;font-variant-numeric:tabular-nums;font-size:14px;text-align:right}

  .project{position:fixed;right:12px;top:calc(12px + env(safe-area-inset-top));z-index:6;
    background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:9px 13px;
    backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:12px;color:var(--dim);
    line-height:1.6;text-align:right;max-width:44vw}
  .project b{display:block;color:#cfe0ff;font-size:13px}
  .project .tag{display:inline-block;margin-top:5px;padding:2px 9px;border-radius:999px;
    background:rgba(56,224,138,.16);color:var(--ok);font-size:11px}

  #toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(190px + env(safe-area-inset-bottom));
    z-index:7;padding:8px 16px;border-radius:999px;background:var(--panel);border:1px solid var(--line);
    font-size:13px;color:var(--ok);opacity:0;transition:opacity .18s;pointer-events:none}
  #toast.show{opacity:1}
  #toast.bad{color:var(--bad);border-color:rgba(255,93,108,.4)}
  #err{position:fixed;left:12px;right:12px;bottom:calc(232px + env(safe-area-inset-bottom));z-index:30;
    background:rgba(110,20,30,.94);border:1px solid rgba(255,93,108,.6);color:#ffdfe3;font-size:12px;
    padding:9px 12px;border-radius:10px;display:none;line-height:1.5}

  /* 左：方向盘 */
  #steer{position:fixed;left:16px;bottom:calc(18px + env(safe-area-inset-bottom));z-index:8;
    width:138px;height:138px;touch-action:none}
  #wheel{width:100%;height:100%;touch-action:none;cursor:grab;filter:drop-shadow(0 10px 18px rgba(0,0,0,.45))}
  #wheel:active{cursor:grabbing}
  #steer .lbl{position:absolute;left:50%;bottom:-16px;transform:translateX(-50%);font-size:11px;
    color:#6f86a8;white-space:nowrap}

  /* 右：踏板与视角 */
  #pads{position:fixed;right:16px;bottom:calc(18px + env(safe-area-inset-bottom));z-index:8;
    display:grid;grid-template-columns:74px 74px;gap:10px}
  .pad{height:64px;border-radius:18px;border:1px solid var(--line);color:#cfe0ff;font-size:13px;
    font-weight:600;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
    background:linear-gradient(180deg,rgba(30,44,68,.92),rgba(13,20,32,.95));
    box-shadow:0 10px 22px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.06);
    touch-action:none;transition:transform .07s,background .12s}
  .pad .ico{font-size:18px;line-height:1}
  .pad:active,.pad.on{transform:translateY(2px) scale(.97);
    background:linear-gradient(180deg,rgba(56,224,138,.26),rgba(18,46,36,.95));
    color:#dcffec;border-color:rgba(56,224,138,.5)}
  .pad.tall{height:64px}
  .pad.brake:active,.pad.brake.on{background:linear-gradient(180deg,rgba(255,93,108,.28),rgba(52,18,24,.95));
    color:#ffdfe3;border-color:rgba(255,93,108,.5)}

  #overlay{position:fixed;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;
    background:radial-gradient(120% 80% at 50% 0%,rgba(20,34,58,.72),rgba(6,10,18,.95));
    backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);padding:18px}
  #overlay.hide{display:none}
  .panel{max-height:calc(100vh - 36px);overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;
    width:min(470px,100%);background:linear-gradient(180deg,rgba(22,33,54,.97),rgba(11,18,30,.99));
    border:1px solid rgba(120,170,255,.24);border-radius:22px;padding:24px 22px;text-align:center;
    box-shadow:0 30px 70px rgba(0,0,0,.6)}
  .panel h1{margin:0 0 6px;font-size:21px}
  .panel .sub{color:var(--dim);font-size:13px;line-height:1.7;margin-bottom:16px}
  .tips{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0 18px;text-align:left}
  .tips div{background:rgba(255,255,255,.045);border:1px solid rgba(120,170,255,.14);
    border-radius:10px;padding:8px 10px;font-size:12px;color:var(--dim);line-height:1.5}
  .tips b{color:#c9dcfb}
  .cta{width:100%;border:0;border-radius:14px;padding:14px;font-size:16px;font-weight:700;color:#04220f;
    background:linear-gradient(180deg,#57f0a4,#22c873);cursor:pointer;box-shadow:0 12px 26px rgba(34,200,115,.3)}
  .cta:active{transform:translateY(1px)}
  .cta.alt{display:block;text-align:center;text-decoration:none;margin-top:10px;
    background:transparent;color:#8ef0b4;border:1px solid rgba(87,240,164,.5);
    box-shadow:none;font-size:15px}
  .result{font-size:38px;font-weight:800;color:var(--ok);margin:6px 0 2px;font-variant-numeric:tabular-nums}
  .stat{color:var(--dim);font-size:13px;line-height:1.9}
  @media (max-width:420px){
    #steer{width:118px;height:118px}
    #pads{grid-template-columns:66px 66px;gap:8px}
    .pad{height:58px;border-radius:16px}
    .project{max-width:40vw;font-size:11px}
  }
  @media (min-width:980px){
    #pads{grid-template-columns:86px 86px}
    .pad{height:70px}
  }

  /* 后视镜 */
  #mirrors{position:fixed;inset:0;pointer-events:none;z-index:5;display:none}
  #mirrors.on{display:block}
  #mirrors .mf{position:absolute;border:2px solid rgba(150,195,255,.5);border-radius:12px;
    box-shadow:0 0 0 1px rgba(4,10,20,.75),0 8px 22px rgba(0,0,0,.5);overflow:hidden;
    pointer-events:auto;cursor:pointer}
  #mirrors .mf i{position:absolute;left:10px;top:6px;font-style:normal;font-size:11px;letter-spacing:.12em;
    color:rgba(206,228,255,.85);text-shadow:0 1px 3px rgba(0,0,0,.85)}