:root{ --cinnabar:#d8412f; --gold:#e7b53c; --ink:#0a2026; --paper:#f3ead6; }
  *{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
  html,body{margin:0;height:100%;background:var(--ink);
    font-family:"PingFang TC","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;
    color:var(--paper);overflow:hidden;}
  body{display:flex;align-items:center;justify-content:center;}
  #wrap{position:relative;width:100%;max-width:960px;height:min(42dvh,56.25vw);margin:0 auto;
    background:#0b3a44;overflow:hidden;box-shadow:0 0 40px rgba(0,0,0,.6);}
  canvas{display:block;width:100%;height:100%;touch-action:none;}
  #rotateNotice{display:none;}

  #hud{position:absolute;top:0;left:0;right:0;padding:9px 12px;display:flex;
    align-items:flex-start;justify-content:space-between;pointer-events:none;
    text-shadow:0 1px 2px rgba(0,0,0,.55);}
  #scoreBox{font-weight:800;}
  #score{font-size:24px;color:var(--gold);line-height:1;}
  #combo{font-size:13px;color:#ffd;opacity:0;transition:opacity .15s;margin-top:2px;}
  #combo.on{opacity:1;}
  #levelBox{text-align:center;flex:1;margin:0 8px;}
  #lvName{font-size:14px;font-weight:800;}
  #lvBarWrap{height:5px;width:100%;max-width:150px;margin:4px auto 0;border-radius:4px;background:rgba(0,0,0,.4);overflow:hidden;}
  #lvBar{height:100%;width:0;background:var(--gold);transition:width .2s ease;}
  #lvNum{font-size:11px;opacity:.85;margin-top:3px;font-weight:700;}
  #hpBox{text-align:right;font-weight:700;}
  #hpBox .label{font-size:11px;opacity:.9;margin-bottom:3px;}
  #hpBox .label b{color:#ffd089;}
  #hpbar{height:12px;width:118px;border-radius:7px;background:rgba(0,0,0,.35);border:1px solid rgba(255,255,255,.25);overflow:hidden;}
  #hpfill{height:100%;width:100%;border-radius:7px;background:linear-gradient(90deg,#e7b53c,#d8412f);transition:width .15s ease;}

  #restartBtn{position:absolute;top:60px;right:12px;display:none;pointer-events:auto;
    align-items:center;gap:5px;background:rgba(10,32,38,.62);color:var(--paper);
    border:1px solid rgba(231,181,60,.65);border-radius:999px;padding:7px 13px;
    font-size:12.5px;font-weight:800;cursor:pointer;backdrop-filter:blur(2px);}
  #restartBtn:active{transform:scale(.95);}

  .overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
    text-align:center;padding:12px 18px;background:radial-gradient(120% 90% at 50% 10%,rgba(15,94,107,.55),rgba(10,32,38,.96));}
  .overlay.hidden{display:none;}
  .title{font-size:28px;font-weight:800;color:var(--gold);margin:0 0 2px;letter-spacing:2px;
    text-shadow:0 2px 0 var(--cinnabar),0 4px 12px rgba(0,0,0,.6);}
  .title--small{font-size:24px;}
  .subtitle{font-size:12px;opacity:.9;margin:0 0 6px;line-height:1.35;}
  .legend{display:grid;grid-template-columns:repeat(5,1fr);gap:4px 9px;font-size:10.5px;margin:2px 0 8px;text-align:left;width:100%;max-width:820px;}
  .legend div{display:flex;align-items:center;gap:5px;min-width:0;}
  .legend span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
  .legend img{width:21px;height:auto;flex:0 0 auto;}
  .btn{appearance:none;border:none;cursor:pointer;background:var(--cinnabar);color:#fff;font-weight:800;font-size:18px;
    padding:10px 34px;border-radius:999px;letter-spacing:2px;box-shadow:0 4px 0 #9c2a1d,0 8px 20px rgba(0,0,0,.4);
    transition:transform .06s ease,box-shadow .06s ease;}
  .btn:active{transform:translateY(3px);box-shadow:0 1px 0 #9c2a1d,0 3px 10px rgba(0,0,0,.4);}
  .btn:focus-visible{outline:3px solid var(--gold);outline-offset:3px;}
  .final{font-size:18px;margin:2px 0;}
  .final b{color:var(--gold);font-size:30px;}
  .best{font-size:13px;opacity:.8;margin:6px 0 18px;}
  .hint{font-size:11px;opacity:.7;margin-top:8px;}

  @media (max-width:640px){
    .overlay{padding:8px 10px;}
    .title{font-size:22px;}
    .subtitle{font-size:10px;margin-bottom:4px;}
    .legend{grid-template-columns:repeat(3,1fr);gap:3px 6px;font-size:9px;max-width:420px;margin-bottom:6px;}
    .legend img{width:18px;}
    .btn{font-size:14px;padding:7px 24px;}
    .hint{font-size:9px;margin-top:5px;}
  }

  @media (pointer:coarse) and (orientation:portrait){
    #wrap{visibility:hidden;}
    #rotateNotice{position:fixed;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;
      padding:24px;background:#0a2026;color:var(--paper);text-align:center;}
    #rotateNotice h2{margin:0 0 8px;color:var(--gold);font-size:28px;letter-spacing:1px;}
    #rotateNotice p{margin:0;font-size:15px;opacity:.86;}
  }

  @media (pointer:coarse) and (orientation:landscape){
    body{align-items:stretch;justify-content:stretch;}
    #wrap{width:100vw;max-width:none;height:100dvh;margin:0;box-shadow:none;}
    .overlay{padding:10px 18px;}
    .legend{grid-template-columns:repeat(5,1fr);max-width:820px;font-size:10px;}
  }