:root{
    --mono:'IBM Plex Mono',monospace;
    --disp:'Space Grotesk',sans-serif;
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    background:
      linear-gradient(var(--grid) 1px, transparent 1px) 0 0/32px 32px,
      linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0/32px 32px,
      var(--bg);
    color:var(--ink); font-family:var(--mono); min-height:100vh;
    display:flex; align-items:center; justify-content:center; padding:24px;
  }
  .wrap{max-width:480px; width:100%;}
  .brand-eyebrow{font-size:11px;letter-spacing:.14em;color:var(--line);text-transform:uppercase;text-align:center;}
  h1{font-family:var(--disp);font-weight:700;font-size:24px;margin:6px 0 4px;text-align:center;}
  .tagline{font-size:12.5px;color:var(--ink-dim);text-align:center;margin:0 0 20px;}

  .frame{position:relative;background:var(--panel);border:1px solid var(--line-dim);border-radius:3px;padding:18px;}
  .frame::before,.frame::after,.tick-bl,.tick-br{content:"";position:absolute;width:12px;height:12px;border-color:var(--line);border-style:solid;}
  .frame::before{top:-1px;left:-1px;border-width:2px 0 0 2px;}
  .frame::after{top:-1px;right:-1px;border-width:2px 2px 0 0;}
  .tick-bl{bottom:-1px;left:-1px;border-width:0 0 2px 2px;}
  .tick-br{bottom:-1px;right:-1px;border-width:0 2px 2px 0;}

  .grid{display:grid;grid-template-columns:repeat(5,1fr);gap:5px;}
  .cell{
    aspect-ratio:1; background:var(--panel-2); border:1px solid var(--line-dim); border-radius:2px;
    display:flex; align-items:center; justify-content:center; text-align:center;
    font-size:9px; line-height:1.25; padding:4px; cursor:pointer; user-select:none;
    transition:background .3s, border-color .3s, transform .15s;
  }
  .cell:hover{border-color:var(--line); transform:scale(1.03);}
  .cell.marked{background:rgba(111,231,179,.16); border-color:var(--ok); color:var(--ok); font-weight:600;}
  .cell.free{background:rgba(255,159,90,.14); border-color:var(--drill); color:var(--drill); font-weight:700; font-size:11px;}

  .stats-row{display:flex; justify-content:space-between; align-items:baseline; margin-top:16px;}
  .stat-label{font-size:11px;color:var(--ink-dim);text-transform:uppercase;letter-spacing:.06em;}
  .stat-value{font-family:var(--disp);font-weight:700;font-size:22px;color:var(--ok);}

  .bingo-banner{
    position:fixed; top:50%; left:50%; transform:translate(-50%,-50%) scale(0.8);
    background:var(--drill); color:#2A1200; font-family:var(--disp); font-weight:700; font-size:42px;
    padding:20px 46px; border-radius:6px; letter-spacing:.08em; z-index:50;
    opacity:0; pointer-events:none; transition:opacity .25s, transform .25s;
    box-shadow:0 0 0 4px #2A1200, 0 20px 60px rgba(0,0,0,.6);
  }
  .bingo-banner.show{opacity:1; transform:translate(-50%,-50%) scale(1);}
  .hint{font-size:11px;color:var(--ink-dim);text-align:center;margin-top:14px;}