:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:#17201b;--bg:#f7f4ef;--surface:#fffdf8;--surface-strong:#f0eadf;--ink:#17201b;--muted:#5d665f;--border:#80776a;--heavy:#1d2a22;--accent:#1f6f5b;--accent-dark:#165544;--selected:#f6d36f;--related:#eee7dc;--same:#d9eadf;--error:#9c3b2f;--error-bg:#f7ddd7;--shadow:0 18px 45px rgba(42,34,22,.12);background:#f7f4ef;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;line-height:1.5}*{box-sizing:border-box}body{background:var(--bg);min-width:320px;min-height:100vh;margin:0}button{font:inherit;touch-action:manipulation}.app-shell{width:min(100%,56rem);min-height:100vh;margin:0 auto;padding:max(1rem,min(3vw,2rem))}.topbar{justify-content:space-between;align-items:end;gap:1rem;margin-bottom:1rem;display:flex}h1{letter-spacing:0;margin:0;font-size:max(2.2rem,min(6vw,3.8rem));line-height:1}.topbar p{color:var(--muted);margin:.35rem 0 0;font-size:max(1rem,min(2.5vw,1.18rem))}.difficulty-badge{background:var(--surface);color:var(--muted);border:1px solid #c8c0b4;border-radius:8px;align-items:baseline;gap:.28rem;margin:0;padding:.42rem .65rem;font-size:.78rem;font-weight:700;display:inline-flex}.difficulty-badge strong{color:var(--ink);font-size:1rem;font-weight:800;line-height:1}.game-area{grid-template-columns:minmax(0,1fr) minmax(18rem,22rem);align-items:start;gap:max(1rem,min(3vw,1.5rem));display:grid}.board-wrap{aspect-ratio:1;border:3px solid var(--heavy);background:var(--heavy);box-shadow:var(--shadow);border-radius:8px;overflow:hidden}.board{aspect-ratio:1;background:var(--heavy);grid-template-columns:repeat(9,1fr);gap:1px;height:100%;display:grid}.cell{background:var(--surface);min-width:0;min-height:0;color:var(--accent-dark);cursor:pointer;border:1px solid #bbb2a5;border-top:0;border-left:0;place-items:center;font-size:max(1.45rem,min(7vw,2.55rem));font-weight:750;line-height:1;display:grid;position:relative}.cell:nth-child(3n){border-right:3px solid var(--heavy)}.cell:nth-child(n+19):nth-child(-n+27),.cell:nth-child(n+46):nth-child(-n+54){border-bottom:3px solid var(--heavy)}.cell:nth-child(9n){border-right:0}.cell:nth-child(n+73){border-bottom:0}.cell.fixed{color:var(--ink);background:#faf7ef;font-weight:900}.cell.related{background:var(--related)}.cell.same-number{background:var(--same)}.cell.selected{z-index:1;background:var(--selected);outline-offset:-4px;outline:4px solid #111914}.cell.incorrect{background:var(--error-bg);color:var(--error);text-underline-offset:.18em;text-decoration:underline;text-decoration-thickness:.16em}.cell em{background:var(--error);color:#fff;letter-spacing:0;border-radius:50%;place-items:center;width:max(.78rem,min(3vw,1rem));height:max(.78rem,min(3vw,1rem));font-size:max(.42rem,min(1.5vw,.6rem));font-style:normal;font-weight:900;display:grid;position:absolute;top:.16rem;right:.16rem}.controls{gap:1rem;display:grid}.status{border-left:5px solid var(--accent);background:var(--surface);min-height:3.5rem;color:var(--ink);border-radius:8px;margin:0;padding:.85rem 1rem;font-size:1.08rem;font-weight:700;box-shadow:0 8px 22px rgba(42,34,22,.08)}.numbers{grid-template-columns:repeat(3,1fr);gap:.55rem;display:grid}.number-button,.action-button{border:2px solid var(--heavy);background:var(--surface);min-height:3.7rem;color:var(--ink);box-shadow:0 3px 0 var(--heavy);cursor:pointer;border-radius:8px;font-weight:900}.number-button{min-height:4.55rem;font-size:2rem}.action-button{padding:.65rem .8rem;font-size:1.05rem}.number-button:active,.action-button:active{box-shadow:0 1px 0 var(--heavy);transform:translateY(2px)}.number-button:focus-visible{outline:4px solid var(--selected);outline-offset:3px}.action-button:focus-visible{outline:4px solid var(--selected);outline-offset:3px}.cell:focus-visible{outline:4px solid var(--selected);outline-offset:3px}.actions{grid-template-columns:1fr 1fr;gap:.65rem;display:grid}.action-button.primary{background:var(--accent);color:#fff}.action-button.quiet{color:#4d554f;box-shadow:none;background:0 0;border-color:#8b8478}.dialog-backdrop{z-index:5;background:rgba(23,32,27,.32);place-items:end center;padding:1rem;display:grid;position:fixed;top:0;bottom:0;left:0;right:0}.new-game-dialog{border:2px solid var(--heavy);background:var(--surface);width:min(100%,24rem);box-shadow:var(--shadow);border-radius:8px;padding:1rem}.new-game-dialog h2{margin:0 0 .75rem;font-size:1.25rem;line-height:1.1}.difficulty-options{grid-template-columns:repeat(3,1fr);gap:.5rem;display:grid}.difficulty-option,.dialog-cancel{border:2px solid var(--heavy);background:var(--surface);min-height:3rem;color:var(--ink);box-shadow:0 3px 0 var(--heavy);cursor:pointer;font:inherit;border-radius:8px;font-weight:900}.difficulty-option:focus-visible{outline:4px solid var(--selected);outline-offset:3px}.dialog-cancel:focus-visible{outline:4px solid var(--selected);outline-offset:3px}.dialog-cancel{color:#4d554f;width:100%;box-shadow:none;border-color:#8b8478;margin-top:.65rem}@media (max-width:760px){body{overflow:hidden}.app-shell{grid-template-rows:auto minmax(0,1fr);height:100dvh;min-height:0;padding:.55rem .85rem;display:grid}.topbar{flex-direction:column;align-items:stretch;gap:.28rem;margin-bottom:.45rem}h1{font-size:max(1.65rem,min(7.2vw,2.15rem))}.topbar p{margin-top:.12rem;font-size:.9rem;line-height:1.25}.difficulty-badge{width:fit-content;min-width:0;padding:.24rem .48rem;font-size:.72rem}.difficulty-badge strong{font-size:.9rem}.game-area{grid-template-rows:auto auto;grid-template-columns:1fr;align-content:start;gap:.42rem;min-height:0}.board-wrap{justify-self:center;width:min(100%,100dvh - 21.5rem);min-width:17.25rem}.controls{gap:.38rem}.numbers{grid-template-columns:repeat(9,1fr);gap:.24rem}.number-button{min-height:2.55rem;padding:0;font-size:1.18rem}.actions{grid-template-columns:1fr 1fr;gap:.36rem}.action-button{min-height:2.55rem;padding:.28rem .45rem;font-size:.88rem}.status{text-overflow:ellipsis;white-space:nowrap;min-height:2.28rem;padding:.42rem .62rem;font-size:.88rem;overflow:hidden}.dialog-backdrop{padding:.75rem}.new-game-dialog{padding:.85rem}}@media (max-width:400px){.app-shell{padding:.45rem .6rem}.cell{font-size:max(1.12rem,min(7.6vw,1.9rem))}.board-wrap{width:min(100%,100dvh - 20.8rem);min-width:0}.number-button,.action-button{min-height:2.35rem}.action-button{font-size:.84rem}}