:root{color-scheme:dark;--ink:#f5f5ee;--muted:#aab4ae;--night:#09110e;--panel:#131d18;--line:#2e4138;--lime:#c9f45b;--blue:#64c9e8;--gold:#ffbc5e;--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(100,201,232,.11),transparent 30rem),var(--night);font-family:var(--body);line-height:1.5}a{color:inherit}button,select{font:inherit}.site-header,main,footer{width:min(900px,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(--blue);font-size:.72rem;font-weight:850;letter-spacing:.16em;text-transform:uppercase}h1,h2,p{margin-top:0}h1{margin-bottom:0;font:clamp(3.3rem,8vw,5.8rem)/.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 auto 1fr auto auto;gap:12px;align-items:center}.toolbar label,.toolbar>div{display:grid;color:var(--muted);font-size:.55rem;font-weight:850;text-transform:uppercase}.toolbar strong{font:900 1.2rem/1 ui-monospace,monospace}.toolbar>div:nth-of-type(1) strong{color:var(--blue)}.toolbar>div:nth-of-type(2) strong{color:var(--gold)}.toolbar p{margin:0;color:var(--muted);font-size:.75rem;text-align:center}.toolbar select,.toolbar button{min-height:40px;padding:0 11px;color:var(--ink);background:#0d1511;border:1px solid #506157;border-radius:8px;font-weight:800}.board{display:grid;grid-template-columns:repeat(4,1fr 5fr) 1fr;grid-template-rows:repeat(4,1fr 5fr) 1fr;width:min(620px,100%);aspect-ratio:1;margin:18px auto 4px;padding:12px;background:#0b1410;border:1px solid var(--line);border-radius:14px;touch-action:manipulation}.dot{z-index:3;align-self:center;justify-self:center;width:13px;aspect-ratio:1;background:#e7ece7;border-radius:50%;box-shadow:0 0 0 3px #26372f}.edge{position:relative;z-index:2;padding:0;background:transparent;border:0;cursor:pointer}.edge::before{content:"";position:absolute;background:#34483e;border-radius:5px}.edge.h::before{inset:calc(50% - 4px) 0;height:8px}.edge.v::before{inset:0 calc(50% - 4px);width:8px}.edge:not(.drawn):hover::before,.edge:not(.drawn):focus-visible::before{background:var(--lime)}.edge.drawn::before{background:#e8eee8}.edge:disabled{cursor:default}.box{margin:3px;border-radius:8px}.box.zero{background:rgba(100,201,232,.45)}.box.one{background:rgba(255,188,94,.48)}.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:700px){.intro{display:block;padding:36px 0 24px}.intro>p{margin-top:16px}.toolbar{grid-template-columns:1fr auto auto}.toolbar p{grid-column:1/-1;grid-row:2}.toolbar button{grid-column:1/-1}.board{padding:7px}.dot{width:10px}.edge.h::before{inset:calc(50% - 3px) 0;height:6px}.edge.v::before{inset:0 calc(50% - 3px);width:6px}.rules{display:block;padding:48px 0}.rules>div+div{margin-top:22px}footer{display:block}footer p{margin-top:8px}}