.sudoku-page{max-width:1120px;margin:0 auto;padding:34px 14px 70px;color:#252a31}
.sudoku-hero{text-align:center;margin:0 auto 24px;max-width:820px}
.sudoku-kicker{display:inline-flex;align-items:center;padding:6px 12px;border:1px solid #d8dadd;border-radius:999px;background:#f4f4f2;color:#646970;font-size:13px;font-weight:800}
.sudoku-hero h1{margin:10px 0 8px;font-size:36px;line-height:1.25;font-weight:900}
.sudoku-hero p{margin:0;color:#737982;line-height:1.85}
.sudoku-panel{background:#fff;border:1px solid #d9dce0;border-radius:24px;box-shadow:0 14px 40px rgba(35,39,45,.07)}
.sudoku-setup{max-width:760px;margin:0 auto;padding:30px}
.setup-top{display:flex;justify-content:space-between;align-items:center;gap:18px}
.setup-label{color:#777d84;font-size:14px;font-weight:700}
.setup-top h2{margin:5px 0 0;font-size:28px}
.difficulty-badge{border:1px solid #d8dadd;background:#f6f6f4;border-radius:12px;padding:9px 13px;font-weight:900;color:#50565d}
.difficulty-slider-wrap{margin:30px 0 15px}
.difficulty-slider{appearance:none;width:100%;height:7px;border-radius:99px;background:#d9dcdf;outline:none}
.difficulty-slider::-webkit-slider-thumb{appearance:none;width:28px;height:28px;border-radius:50%;background:#343a40;border:4px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.2);cursor:pointer}
.difficulty-slider::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:#343a40;border:4px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.2);cursor:pointer}
.difficulty-labels{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-top:10px;color:#777d84;font-size:12px;font-weight:700;text-align:center}
.difficulty-info{min-height:26px;margin:20px auto;color:#686e75;text-align:center;line-height:1.7}
.sudoku-btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:12px;border:1px solid #cfd2d6;background:#fff;color:#33383e;font:inherit;font-weight:800;text-decoration:none;cursor:pointer;transition:.15s ease}
.sudoku-btn:hover{transform:translateY(-1px);background:#f7f7f6}
.sudoku-btn:focus-visible,.number-key:focus-visible,.sudoku-cell:focus-visible,.notes-toggle:focus-visible{outline:3px solid #9ca3af;outline-offset:2px}
.sudoku-btn-primary{background:#343a40;color:#fff;border-color:#343a40;min-width:190px}
.sudoku-btn-primary:hover{background:#24282c}
.sudoku-btn-secondary{background:#ece8dc;border-color:#d8d0bd;color:#4c4330}
.sudoku-btn-light{background:#f5f5f3}
.sudoku-btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.sudoku-game{padding:22px}
.game-toolbar{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:20px}
.toolbar-stat{border:1px solid #e0e2e5;background:#f8f8f6;border-radius:14px;padding:10px 13px;text-align:center}
.toolbar-stat span{display:block;color:#7a7f86;font-size:12px;font-weight:700;margin-bottom:4px}
.toolbar-stat strong{font-size:18px}
.sudoku-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px;align-items:start}
.board-column{min-width:0}
.sudoku-board{width:min(100%,650px);aspect-ratio:1;margin:0 auto;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);border:3px solid #363b40;border-radius:14px;overflow:hidden;background:#fff}
.sudoku-cell{position:relative;min-width:0;min-height:0;padding:0;border:0;border-left:1px solid #d7dade;border-top:1px solid #d7dade;background:#fff;color:#252a30;font:900 clamp(18px,4vw,31px)/1 Arial,sans-serif;cursor:pointer}
.sudoku-cell:nth-child(9n+1){border-left:0}
.sudoku-cell:nth-child(-n+9){border-top:0}
.sudoku-cell.border-right{border-right:0;border-left:3px solid #555b61}
.sudoku-cell.border-bottom{border-bottom:3px solid #555b61}
.sudoku-cell.given{background:#f1f2f0;color:#292e34}
.sudoku-cell.user-value{color:#4b5158}
.sudoku-cell.related{background:#f5f5f2}
.sudoku-cell.selected{background:#e6e3da}
.sudoku-cell.same-number{background:#ebe8df}
.sudoku-cell.mistake{background:#f3dddd!important;color:#8b3030;animation:sudoku-shake .16s linear 2}
.cell-notes{display:grid;grid-template-columns:repeat(3,1fr);position:absolute;inset:5px;font-size:clamp(8px,1.3vw,12px);line-height:1;color:#777d83;font-weight:800}
.cell-notes span{display:flex;align-items:center;justify-content:center}
.board-actions{display:flex;justify-content:center;gap:9px;flex-wrap:wrap;margin-top:16px}
.sudoku-side-panel{display:grid;gap:12px}
.side-card{border:1px solid #e0e2e5;background:#fafaf8;border-radius:16px;padding:16px}
.side-card h3{margin:0 0 10px;font-size:17px}
.side-card ul{margin:0;padding:0 18px 0 0;color:#696f76;line-height:1.8;font-size:13px}
.number-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}
.number-key{height:48px;border:1px solid #d4d7da;border-radius:10px;background:#fff;font-size:20px;font-weight:900;cursor:pointer;color:#30353a}
.number-key:hover{background:#f0f0ee}
.note-head{display:flex;justify-content:space-between;align-items:center;gap:10px}
.note-head h3{margin:0}
.note-card p{margin:8px 0 0;color:#777d84;font-size:12px;line-height:1.6}
.notes-toggle{border:1px solid #cfd2d6;border-radius:9px;background:#fff;padding:7px 11px;font:inherit;font-weight:800;cursor:pointer}
.notes-toggle[aria-pressed="true"]{background:#e8e5dc;border-color:#bdb7a9}
.sudoku-result{max-width:760px;margin:0 auto;padding:38px 25px;text-align:center}
.result-icon{width:72px;height:72px;display:grid;place-items:center;margin:0 auto 15px;border-radius:50%;background:#ecebe5;font-size:34px;font-weight:900}
.sudoku-result h2{margin:10px 0 8px;font-size:32px}
.sudoku-result p{color:#6d737a;line-height:1.8}
.result-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:25px 0}
.result-stats div{border:1px solid #e0e2e5;border-radius:14px;background:#fafaf8;padding:13px 8px}
.result-stats strong{display:block;font-size:22px}
.result-stats span{display:block;margin-top:4px;color:#777d84;font-size:12px}
.result-actions{display:flex;justify-content:center;gap:9px;flex-wrap:wrap}
@keyframes sudoku-shake{0%,100%{transform:translateX(0)}50%{transform:translateX(3px)}}
@media(max-width:900px){.sudoku-layout{grid-template-columns:1fr}.sudoku-side-panel{grid-template-columns:repeat(2,minmax(0,1fr))}.number-pad-card{grid-column:span 1}}
@media(max-width:620px){.sudoku-page{padding:24px 8px 55px}.sudoku-hero h1{font-size:29px}.sudoku-setup{padding:22px 15px}.setup-top h2{font-size:24px}.difficulty-labels{font-size:10px}.sudoku-game{padding:12px}.game-toolbar{grid-template-columns:repeat(2,1fr)}.sudoku-board{border-radius:9px}.sudoku-cell.border-right{border-right:0;border-left-width:2px}.sudoku-cell.border-bottom{border-bottom-width:2px}.sudoku-side-panel{grid-template-columns:1fr}.result-stats{grid-template-columns:repeat(2,1fr)}}