:root{color-scheme:dark;--ink:#f5f6ed;--muted:#aab4ae;--night:#07100d;--panel:#121c17;--line:#2d4137;--lime:#c9f45b;--mint:#70d7aa;--display:"Arial Black","Helvetica Neue",Arial,sans-serif;--body:Inter,system-ui,sans-serif}*{box-sizing:border-box}html{min-width:280px;background:var(--night)}body{margin:0;color:var(--ink);background:radial-gradient(circle at 80% 4%,rgba(201,244,91,.1),transparent 30rem),var(--night);font-family:var(--body);line-height:1.5}a{color:inherit}button{font:inherit}.site-header,main,footer{width:min(850px,calc(100% - 36px));margin:auto}.site-header{display:flex;align-items:center;justify-content:space-between;min-height:78px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;font-weight:850;text-decoration:none}.brand span{display:grid;width:34px;aspect-ratio:1;place-items:center;color:var(--night);background:var(--lime);border-radius:9px;font-family:var(--display)}.site-header p{margin:0;color:var(--muted);font-size:.7rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.intro{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:end;padding:50px 0 30px}.intro>p{margin:0;color:var(--muted)}.eyebrow{margin:0 0 8px;color:var(--mint);font-size:.72rem;font-weight:850;letter-spacing:.16em;text-transform:uppercase}h1,h2,p{margin-top:0}h1{margin-bottom:0;font:clamp(3.5rem,9vw,6rem)/.84 var(--display);letter-spacing:-.07em}.game-shell{padding:14px;background:var(--panel);border:1px solid var(--line);border-radius:18px}.toolbar{display:grid;grid-template-columns:auto 1fr auto auto;gap:12px;align-items:center}.toolbar>div{display:grid}.toolbar small{color:var(--muted);font-size:.56rem;font-weight:850;text-transform:uppercase}.toolbar strong{color:var(--lime);font:900 1.2rem/1 ui-monospace,monospace}.toolbar p{margin:0;color:var(--muted);font-size:.76rem;text-align:center}.toolbar button{min-height:40px;padding:0 12px;color:var(--ink);background:#0d1511;border:1px solid #506157;border-radius:8px;font-weight:800;cursor:pointer}.board{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;width:min(570px,100%);aspect-ratio:1;margin:16px auto 2px;padding:16px;background:#09110e;border:1px solid var(--line);border-radius:15px;touch-action:manipulation}.cell{position:relative;border:1px solid #34483e;border-radius:12px;background:#18231e;cursor:pointer}.cell::after{content:"";position:absolute;inset:28%;background:#26372f;border-radius:50%;transition:all .12s}.cell.on{background:#2b3a21;border-color:#8baa3f;box-shadow:inset 0 0 20px rgba(201,244,91,.13)}.cell.on::after{inset:20%;background:var(--lime);box-shadow:0 0 18px rgba(201,244,91,.65)}.cell:hover,.cell:focus-visible{border-color:var(--mint)}.cell:disabled{cursor:default}.rules{display:grid;grid-template-columns:1fr 1.15fr;gap:65px;padding:70px 0}.rules h2{font:clamp(2rem,5vw,3.5rem)/.95 var(--display);letter-spacing:-.05em}.rules p{color:var(--muted)}footer{display:flex;justify-content:space-between;padding:24px 0 38px;border-top:1px solid var(--line);color:var(--muted);font-size:.78rem}footer a{font-weight:800;text-decoration:none}footer p{margin:0}@media(max-width:650px){.intro{display:block;padding:36px 0 24px}.intro>p{margin-top:16px}.toolbar{grid-template-columns:auto 1fr auto}.toolbar p{grid-column:1/-1;grid-row:2}.toolbar button{padding:0 8px;font-size:.7rem}.board{gap:5px;padding:9px}.cell{border-radius:8px}.rules{display:block;padding:48px 0}.rules>div+div{margin-top:22px}footer{display:block}footer p{margin-top:8px}}