:root{color-scheme:dark;--ink:#f2f7f3;--muted:#9ba9a0;--night:#07100b;--panel:#101c15;--line:#2c4436;--lime:#c9f45b;--mint:#6ed8a4;--display:"Arial Black","Helvetica Neue",Arial,sans-serif;--body:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*{box-sizing:border-box}html{min-width:280px;background:var(--night)}body{min-height:100vh;margin:0;color:var(--ink);background:radial-gradient(circle at 82% 5%,rgba(110,216,164,.11),transparent 30rem),var(--night);font-family:var(--body);line-height:1.5}a{color:inherit}button{color:inherit;font:inherit}.site-header,main,footer{width:min(1060px,calc(100% - 40px));margin-inline:auto}.site-header{display:flex;align-items:center;justify-content:space-between;min-height:78px;border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;gap:11px;font-weight:850;text-decoration:none}.brand-mark{display:grid;width:34px;height:34px;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:.13em;text-transform:uppercase}.site-header p span,.eyebrow{color:var(--mint)}.intro{display:grid;grid-template-columns:1fr minmax(260px,400px);gap:60px;align-items:end;padding:58px 0 36px}.intro>p{margin-bottom:3px;color:var(--muted)}.eyebrow{margin:0 0 10px;font-size:.72rem;font-weight:850;letter-spacing:.18em;text-transform:uppercase}h1,h2,p{margin-top:0}h1{margin-bottom:0;font-family:var(--display);font-size:clamp(3.4rem,8vw,6.4rem);line-height:.86;letter-spacing:-.07em}.game-shell{max-width:700px;margin-inline:auto;overflow:hidden;background:var(--panel);border:1px solid var(--line);border-radius:17px}.mode{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border-bottom:1px solid var(--line)}.mode button{display:grid;gap:1px;min-height:58px;padding:10px 16px;text-align:left;background:var(--panel);border:0;cursor:pointer}.mode button[aria-pressed="true"]{color:var(--night);background:var(--mint)}.mode strong{font-size:.82rem}.mode span{color:var(--muted);font-size:.66rem}.mode button[aria-pressed="true"] span{color:#194834}.scorebar{display:grid;grid-template-columns:auto 1fr auto auto;gap:14px;align-items:center;padding:12px 14px}.scorebar>div{display:grid;grid-template-columns:auto auto;gap:0 7px;align-items:center}.scorebar small{color:var(--muted);font-size:.58rem;font-weight:800;text-transform:uppercase}.scorebar strong{grid-column:2;color:var(--lime);font:850 1.25rem/1 ui-monospace,SFMono-Regular,Menlo,monospace}.scorebar p{margin:0;color:var(--muted);font-size:.72rem;text-align:center}.scorebar button{min-height:40px;padding:0 12px;background:transparent;border:1px solid #4c6255;border-radius:8px;font-size:.72rem;font-weight:800;cursor:pointer}.scorebar button:hover,.scorebar button:focus-visible{color:var(--night);background:var(--lime);border-color:var(--lime)}.disc{display:block;width:clamp(21px,5vw,37px);aspect-ratio:1;border-radius:50%;box-shadow:inset 2px 3px 5px rgba(255,255,255,.2),0 3px 5px rgba(0,0,0,.35)}.disc--black{background:#080a09;border:1px solid #46524b}.disc--white{background:#f2f0e8;border:1px solid #fff}.board{display:grid;grid-template-columns:repeat(8,1fr);gap:2px;aspect-ratio:1;padding:clamp(6px,1.3vw,12px);background:#213c2d;border-top:1px solid #405d4b;touch-action:manipulation}.cell{position:relative;display:grid;aspect-ratio:1;padding:0;place-items:center;background:#2d684b;border:0;cursor:pointer}.cell::before{content:"";position:absolute;inset:0;border:1px solid rgba(4,16,9,.42)}.cell--legal::after{content:"";position:absolute;width:17%;aspect-ratio:1;background:var(--lime);border-radius:50%;box-shadow:0 0 12px rgba(201,244,91,.6)}.cell:hover,.cell:focus-visible{outline:3px solid var(--lime);outline-offset:-3px;z-index:2}.cell--last{background:#397b5a}.cell .disc{width:75%;transition:transform 180ms ease}.board--thinking .cell{cursor:wait}.rules{display:grid;grid-template-columns:1fr 1fr;gap:clamp(50px,9vw,110px);padding:90px 0}.rules h2{margin:0;font-family:var(--display);font-size:clamp(2rem,4vw,3.8rem);line-height:.98;letter-spacing:-.05em}.rules>p{margin:0;color:var(--muted)}footer{display:flex;justify-content:space-between;padding:28px 0 42px;color:var(--muted);border-top:1px solid var(--line);font-size:.8rem}footer a{color:var(--ink);font-weight:750;text-decoration:none}footer p{margin:0}@media(max-width:680px){.site-header,main,footer{width:min(100% - 20px,620px)}.site-header{min-height:64px}.intro{grid-template-columns:1fr;gap:18px;padding:38px 0 27px}.game-shell{border-radius:12px}.scorebar{grid-template-columns:auto auto 1fr;gap:8px}.scorebar p{grid-column:1/-1;grid-row:2}.scorebar button{justify-self:end}.board{padding:6px;gap:1px}.rules{grid-template-columns:1fr;gap:22px;padding:72px 0 82px}}@media(max-width:430px){.intro h1{font-size:clamp(3rem,16vw,4.3rem)}.mode button{padding:9px 10px}.scorebar{padding:9px}.scorebar .disc{width:23px}.rules{padding-top:68px}footer{display:block}footer p{margin-top:6px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}