.sudoku-heading{text-align:center;margin:8px 0 35px}.sudoku-heading .eyebrow{justify-content:center;font-size:9px}.sudoku-heading h1{margin:12px 0 8px;font-size:35px}.sudoku-heading h1 span{color:var(--purple);letter-spacing:-.5px;margin-left:8px;font-size:23px;font-weight:500}.sudoku-heading p{font-size:13px}.play-layout{grid-template-columns:minmax(0,570px) minmax(250px,1fr);align-items:start;gap:65px;max-width:980px;margin:0 auto 65px;display:grid}.play-panel{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;min-width:0;padding:25px 28px}.game-topbar{justify-content:space-between;align-items:center;gap:10px;margin-bottom:17px;display:flex}.difficulty-control{align-items:center;gap:9px;display:flex}.difficulty-control label{color:var(--muted);font-size:11px}.difficulty-control select{-webkit-appearance:none;appearance:none;-webkit-text-fill-color:var(--ink);background-image:linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);border:1px solid var(--line);background-position:calc(100% - 13px),calc(100% - 9px);background-repeat:no-repeat;background-size:4px 4px;background-color:var(--soft);color:var(--ink);border-radius:8px;max-width:150px;min-height:40px;padding:7px 25px 7px 9px;font-size:12px}.timer-group{color:var(--muted);align-items:center;gap:8px;display:flex}#timer{font-variant-numeric:tabular-nums;min-width:42px;color:var(--ink);font-size:14px}.pause-button{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:8px;place-items:center;width:36px;height:36px;margin-left:2px;display:grid}.pause-button:hover{background:var(--soft)}.board-shell{aspect-ratio:1;width:100%;position:relative}.sudoku-board{border:2px solid var(--ink);background:var(--surface);border-radius:5px;grid-template-rows:repeat(9,minmax(0,1fr));width:100%;height:100%;display:grid;overflow:hidden}.sudoku-row{grid-template-columns:repeat(9,minmax(0,1fr));min-height:0;display:grid}.sudoku-cell{border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface);color:var(--purple);font-variant-numeric:tabular-nums;isolation:isolate;border-radius:0;place-items:center;min-width:0;min-height:0;padding:0;font-size:clamp(19px,2.3vw,27px);line-height:1;display:grid;position:relative}.sudoku-cell:nth-child(3n):not(:last-child){border-right:2px solid var(--board-line)}.sudoku-cell:last-child{border-right:0}.sudoku-row:nth-child(3n):not(:last-child) .sudoku-cell{border-bottom:2px solid var(--board-line)}.sudoku-row:last-child .sudoku-cell{border-bottom:0}.sudoku-cell.given{color:var(--ink);font-weight:700}.sudoku-cell.related{background:var(--related)}.sudoku-cell.same-number{background:var(--same);font-weight:750}.sudoku-cell.selected{background:var(--selected);box-shadow:inset 0 0 0 2px var(--purple);z-index:1}.sudoku-cell.conflict{color:var(--error);text-underline-offset:4px;text-decoration:underline wavy}.conflict-mark{font-size:8px;font-weight:800;line-height:1;display:none;position:absolute;top:2px;right:3px}.sudoku-cell.conflict .conflict-mark{display:block}.sudoku-cell:hover{background:var(--related)}.sudoku-cell.selected:hover{background:var(--selected)}.sudoku-cell:focus-visible{outline:3px solid var(--purple);outline-offset:-3px;z-index:2}.sudoku-cell:active{transform:none!important}.cell-notes{color:var(--muted);grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);font-size:clamp(8px,1vw,11px);line-height:1.15;display:grid;position:absolute;inset:3px}.cell-notes>span{place-items:center;display:grid}.board-overlay{z-index:4;background:var(--surface);border:2px solid var(--ink);text-align:center;border-radius:5px;flex-direction:column;justify-content:center;align-items:center;padding:16px;display:flex;position:absolute;inset:0}.board-overlay h2{margin:12px 0 8px;font-size:23px}.board-overlay p{max-width:240px;margin-bottom:22px;font-size:11px}.board-overlay .button{min-height:42px;padding:10px 20px;font-size:12px}.game-feedback{color:var(--muted);justify-content:space-between;align-items:start;gap:12px;min-height:34px;margin:14px 0 17px;font-size:10px;display:flex}.game-feedback>span:last-child{white-space:nowrap;flex-shrink:0}.game-feedback .error{color:var(--error)}.game-tools{grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:18px;display:grid}.game-tools button{background:var(--soft);border:1px solid var(--line);color:var(--ink);border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:6px;min-height:67px;font-size:11px;display:flex}.game-tools button:not(:disabled):hover{background:var(--purple-soft)}.game-tools button[aria-pressed=true]{background:var(--purple-soft);border-color:var(--purple);color:var(--purple)}.tool-state{background:var(--line);color:var(--ink);border-radius:3px;margin-left:3px;padding:1px 4px;font-size:8px}.number-pad{grid-template-columns:repeat(9,minmax(0,1fr));gap:6px;display:grid}.number-pad button{background:var(--purple-soft);color:var(--purple);border:1px solid #0000;border-radius:8px;min-height:47px;padding:7px 0;font-size:23px;font-weight:600}.number-pad button:not(:disabled):hover{border-color:var(--purple)}.game-bottom-controls{justify-content:space-between;gap:12px;margin-top:21px;display:flex}.game-bottom-controls .button{gap:9px;min-height:43px;padding:10px 19px;font-size:12px}.secondary{background:var(--surface);border-color:var(--line);color:var(--muted)}.secondary:hover{background:var(--soft);color:var(--ink)}.save-status{text-align:center;margin-top:22px;font-size:10px}.save-status svg{margin-right:4px}.save-status.error{color:var(--error)}.keyboard-help{text-align:center;color:var(--muted);margin-top:10px;font-size:9px;line-height:1.9}.game-sidebar{padding-top:36px}.sidebar-label{color:var(--purple);letter-spacing:1.6px;font-size:8px;font-weight:700}.game-sidebar>h2{margin:13px 0 18px;font-size:27px;line-height:1.65}.game-sidebar>p{max-width:270px;margin-bottom:29px;font-size:12px;line-height:2}.sidebar-rule{align-items:start;gap:13px;margin-bottom:25px;display:flex}.sidebar-rule>span{color:var(--purple);background:var(--purple-soft);border-radius:8px;flex-shrink:0;place-items:center;width:28px;height:28px;font-size:10px;display:grid}.sidebar-rule h3{margin:3px 0 5px;font-size:12px}.sidebar-rule p{font-size:11px;line-height:1.8}.sidebar-guide{color:var(--purple);align-items:center;gap:13px;margin-top:30px;font-size:11px;display:flex}.storage-note{border-top:1px solid var(--line);color:var(--muted);align-items:start;gap:10px;margin-top:35px;padding-top:20px;display:flex}.storage-note p{font-size:10px;line-height:1.9}.game-dialog{background:var(--surface);color:var(--ink);border:1px solid var(--line);text-align:center;border-radius:22px;width:min(410px,100% - 32px);max-height:90dvh;padding:30px;overflow:auto;box-shadow:0 20px 80px #0003}.game-dialog::backdrop{backdrop-filter:blur(4px);background:#17192e88}.game-dialog h2{margin:8px 0 13px;font-size:24px}.game-dialog p{font-size:12px;line-height:1.9}.dialog-buttons{justify-content:center;gap:12px;margin-top:25px;display:flex}.dialog-buttons button{gap:0;min-height:43px;padding:11px 18px;font-size:12px}.share-button{color:var(--purple);background:0 0;border:0;min-height:44px;margin-top:22px;font-size:12px;text-decoration:underline}.share-status{min-height:23px;margin-top:8px!important;font-size:11px!important}#win-details{background:var(--soft);border:1px solid var(--line);white-space:pre-line;border-radius:10px;margin-top:18px;padding:13px;font-size:13px;line-height:2}.sudoku-guide{border-top:1px solid var(--line);padding:55px 0 45px;scroll-margin-top:25px}.guide-title{text-align:center;margin-bottom:36px}.guide-title .eyebrow{justify-content:center;font-size:9px}.guide-title h2{margin:12px 0 10px;font-size:28px}.guide-title p{font-size:12px}.guide-content{grid-template-columns:1fr 1fr;gap:50px;max-width:1000px;margin:auto;display:grid}.guide-content h3{letter-spacing:-.2px;margin:25px 0 13px;font-size:17px}.guide-content article>h3:first-child{margin-top:0}.guide-content p,.guide-content li{color:var(--muted);font-size:13px;line-height:2}.guide-content p+p{margin-top:15px}.guide-content ol{padding-left:20px}.guide-content strong{color:var(--ink)}.faq-section{max-width:850px;margin:0 auto 75px;padding-top:25px}.faq-section>.eyebrow{justify-content:center;font-size:9px}.faq-section>h2{text-align:center;margin:12px 0 28px;font-size:27px}.faq-list{border-top:1px solid var(--line)}.faq-list details{border-bottom:1px solid var(--line)}.faq-list summary{cursor:pointer;justify-content:space-between;align-items:center;gap:20px;padding:20px 2px;font-size:13px;font-weight:600;list-style:none;display:flex}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary svg{color:var(--muted)}.faq-list details[open] summary svg{transform:rotate(180deg)}.faq-list details>p{padding:0 20px 22px 2px;font-size:12px;line-height:2}@media (width<=900px){.play-layout{grid-template-columns:minmax(0,540px) minmax(210px,1fr);gap:30px}.play-panel{padding:20px}.game-sidebar>h2{font-size:23px}.game-tools{gap:7px}.number-pad{gap:4px}.number-pad button{font-size:21px}.guide-content{gap:30px}}@media (width<=760px){.sudoku-heading{margin:0 0 25px}.sudoku-heading h1{font-size:29px}.sudoku-heading h1 span{font-size:20px}.sudoku-heading p{font-size:12px}.play-layout{max-width:520px;margin-bottom:35px;display:block}.play-panel{border-radius:14px;padding:20px 16px}.game-sidebar{padding:30px 9px 0}.sidebar-label,.game-sidebar>h2,.game-sidebar>p,.sidebar-rule,.storage-note{display:none}.sidebar-guide{justify-content:center;margin:0}.sudoku-cell{font-size:clamp(20px,6vw,28px)}.cell-notes{font-size:clamp(8px,2vw,11px);inset:2px}.number-pad button{min-height:47px;font-size:23px}.game-topbar{gap:7px}.timer-group{gap:5px}.difficulty-control{gap:7px}.difficulty-control select{padding-left:6px;padding-right:23px;font-size:11px}.difficulty-control label{font-size:10px}.game-feedback{gap:8px;margin-block:12px;font-size:9px}.game-tools button{min-height:62px;font-size:10px}.game-tools{margin-bottom:15px}.game-bottom-controls .button{padding-inline:15px;font-size:11px}.game-bottom-controls{margin-top:18px}.keyboard-help{font-size:8px}.sudoku-guide{padding-block:35px}.guide-title h2{font-size:25px}.guide-content{grid-template-columns:1fr;gap:25px}.guide-content p,.guide-content li{font-size:13px}.guide-content h3{font-size:17px}.faq-section{margin-bottom:45px}.faq-list summary{padding-block:17px;font-size:12px}.board-overlay h2{font-size:21px}}@media (width<=374px){.play-panel{padding:15px 10px}.difficulty-control label{display:none}.difficulty-control select{max-width:130px}.timer-group{gap:4px}.number-pad{gap:3px}.number-pad button{min-height:44px;font-size:21px}.game-tools{gap:6px}.game-feedback{font-size:8px}.sudoku-cell{font-size:20px}.conflict-mark{font-size:7px;right:2px}.cell-notes{font-size:8px;inset:1px}.sudoku-heading h1{font-size:27px}.game-bottom-controls .button{padding-inline:12px}.board-overlay p{margin-bottom:15px;font-size:10px}.board-overlay>svg{height:55px}.board-overlay h2{margin-top:7px}}.difficulty-control select option{color:var(--ink);background:var(--soft)}html[data-theme=dark] #difficulty{color:#efeff6;-webkit-text-fill-color:#efeff6;color-scheme:dark;background-color:#282b38}