:root{
    --ink:#171717;
    --paper:#FFF7EC;
    --paper2:#FFFDF8;
    --pink:#FF8FE0;
    --yellow:#FFCF3F;
    --mint:#3EE7A8;
    --red:#FF6161;
    --blue:#7C9BFF;
    --shadow: 4px 4px 0 var(--ink);
    --shadow-sm: 2px 2px 0 var(--ink);
  }
  *{box-sizing:border-box; -webkit-tap-highlight-color: transparent;}
  html,body{margin:0; padding:0; width:100%; height:100%; overflow:hidden; background:var(--paper); font-family:'Inter',sans-serif; color:var(--ink);}

  #bg-decor{position:fixed; inset:0; z-index:0; overflow:hidden; pointer-events:none;}
  .blob{position:absolute; border-radius:50%; opacity:.55; filter:blur(0px);}
  .blob.b1{width:260px; height:260px; background:var(--yellow); top:-80px; left:-80px; border:3px solid var(--ink); opacity:.5;}
  .blob.b2{width:220px; height:220px; background:var(--blue); bottom:-70px; right:-60px; border:3px solid var(--ink); opacity:.45;}
  .blob.b3{width:140px; height:140px; background:var(--mint); top:60%; left:-50px; border:3px solid var(--ink); opacity:.4;}
  .blob.b4{width:120px; height:120px; background:var(--pink); top:10%; right:8%; border:3px solid var(--ink); opacity:.4; display:none;}

  #canvas-holder{position:fixed; inset:0; z-index:1;}
  canvas{display:block; touch-action:none;}

  .hidden{display:none !important;}

  /* ---------- shared card / button look ---------- */
  .card{
    background:var(--paper2);
    border:3px solid var(--ink);
    border-radius:16px;
    box-shadow:var(--shadow);
  }
  .btn{
    font-family:'Space Grotesk',sans-serif;
    font-weight:700;
    font-size:15px;
    letter-spacing:.2px;
    background:var(--paper2);
    border:3px solid var(--ink);
    border-radius:12px;
    box-shadow:var(--shadow-sm);
    padding:12px 20px;
    cursor:pointer;
    color:var(--ink);
    transition:transform .08s ease;
    user-select:none;
  }
  .btn:active{ transform:translate(2px,2px); box-shadow:0 0 0 var(--ink); }
  .btn.primary{ background:var(--pink); }
  .btn.yellow{ background:var(--yellow); }
  .btn.mint{ background:var(--mint); }
  .btn.small{ padding:8px 12px; font-size:13px; border-radius:10px; box-shadow:2px 2px 0 var(--ink);}
  .btn.icon{ width:46px; height:46px; padding:0; display:flex; align-items:center; justify-content:center; font-size:18px; border-radius:12px;}

  /* ---------- screens ---------- */
  .screen{
    position:fixed; inset:0; z-index:20;
    display:flex; align-items:center; justify-content:center;
    padding:20px;
  }
  .panel{
    max-width:460px; width:100%;
    padding:34px 30px 30px;
    text-align:center;
    position:relative;
  }
  .logo-tag{
    display:inline-block; background:var(--ink); color:var(--paper2);
    font-family:'Space Grotesk'; font-weight:700; font-size:12px;
    letter-spacing:2px; padding:5px 10px; border-radius:8px; margin-bottom:14px;
  }
  h1.title{
    font-family:'Space Grotesk', sans-serif; font-weight:700;
    font-size:44px; line-height:1; margin:0 0 6px;
    letter-spacing:-1px;
  }
  h1.title span{ color:var(--pink); -webkit-text-stroke:1.5px var(--ink); }
  .tagline{ font-size:15px; font-weight:500; color:#4a4a4a; margin:0 0 22px; }

  .diff-row{ display:flex; gap:12px; margin-bottom:22px; }
  .diff-card{
    flex:1; border:3px solid var(--ink); border-radius:14px; padding:14px 8px;
    cursor:pointer; background:var(--paper2); box-shadow:var(--shadow-sm);
    transition:transform .1s ease;
  }
  .diff-card:hover{ transform:translateY(-3px); }
  .diff-card.selected{ background:var(--yellow); }
  .diff-card .n{ font-family:'Space Grotesk'; font-weight:700; font-size:22px; }
  .diff-card .lbl{ font-size:12px; font-weight:800; text-transform:uppercase; letter-spacing:.5px; margin-top:2px;}
  .diff-card .sub{ font-size:11px; color:#555; margin-top:4px; }

  .start-btn{ width:100%; font-size:18px; padding:16px; border-radius:14px; }

  .howto-link{
    margin-top:16px; font-size:13px; font-weight:700; text-decoration:underline;
    cursor:pointer; display:inline-block;
  }

  /* ---------- HUD ---------- */
  #hud{ position:fixed; inset:0; z-index:10; pointer-events:none; }
  .hud-top{
    position:absolute; top:16px; left:16px; right:16px;
    display:flex; justify-content:space-between; align-items:flex-start;
    gap:8px; flex-wrap:nowrap;
  }
  .stat{
    pointer-events:auto; flex:0 0 auto;
    padding:10px 16px; border-radius:14px; min-width:70px; text-align:center;
  }
  .stat .v{ font-family:'Space Grotesk'; font-weight:700; font-size:20px; line-height:1;}
  .stat .k{ font-size:10px; font-weight:800; text-transform:uppercase; letter-spacing:.6px; color:#555; margin-top:3px;}
  .hud-center-group{
    flex:0 0 auto; display:flex; flex-direction:column; align-items:center; gap:6px;
  }
  .hud-actions{ display:flex; gap:6px; pointer-events:auto; }
  .hud-center{
    pointer-events:auto; padding:8px 16px; border-radius:14px; text-align:center;
  }
  .hud-center .v{font-family:'Space Grotesk'; font-weight:700; font-size:18px;}
  .hud-center .k{font-size:10px; font-weight:800; text-transform:uppercase; letter-spacing:.6px; color:#555;}

  #hint-toast{
    position:absolute; top:112px; left:50%; transform:translateX(-50%);
    pointer-events:none; font-size:13px; font-weight:700; background:var(--ink); color:var(--paper2);
    padding:8px 14px; border-radius:10px; opacity:0; transition:opacity .35s ease;
    white-space:nowrap;
  }
  #hint-toast.show{ opacity:1; }

  /* ---------- bottom controls ---------- */
  #controls{
    position:fixed; bottom:18px; left:0; right:0;
    display:flex; justify-content:center; align-items:center; gap:10px;
    pointer-events:none; z-index:10;
  }
  #controls .btn{ pointer-events:auto; }
  .dpad{ display:flex; gap:8px; align-items:center; }

  /* ---------- win modal ---------- */
  #win-modal .panel{ max-width:420px; }
  .confetti-wrap{ position:fixed; inset:0; z-index:19; pointer-events:none; overflow:hidden; }
  .confetti-piece{ position:absolute; top:-30px; font-size:22px; will-change:transform; }

  .stats-row{ display:flex; gap:10px; margin:18px 0 22px; }
  .stats-row .card{ flex:1; padding:14px 6px; }
  .stats-row .v{ font-family:'Space Grotesk'; font-weight:700; font-size:24px; }
  .stats-row .k{ font-size:10px; font-weight:800; text-transform:uppercase; letter-spacing:.5px; color:#555; margin-top:2px;}

  .btn-row{ display:flex; gap:10px; }
  .btn-row .btn{ flex:1; }

  @media (max-width:480px){
    h1.title{ font-size:34px; }
    .panel{ padding:26px 18px 22px; }
    .stat{ padding:7px 10px; min-width:54px;}
    .stat .v{ font-size:15px; }
    .stat .k{ font-size:8.5px; }
    .hud-center{ padding:6px 10px; }
    .hud-center .v{ font-size:14px; }
    .hud-actions{ gap:5px; }
    .btn.icon{ width:38px; height:38px; font-size:15px; border-radius:10px; }
    #hint-toast{ font-size:11px; padding:6px 10px; top:104px; }
    .dpad{ gap:6px; }
  }
  @media (max-width:360px){
    .stat{ min-width:46px; padding:6px 8px; }
    .stat .k{ display:none; }
    .btn.icon{ width:34px; height:34px; font-size:14px; }
    .dpad{ gap:4px; }
  }