:root{color-scheme:light;--paper:#f2f0e8;--ink:#173a34;--muted:#5c6f68;--line:#ccd5cb;--green:#285c4b;--light:#e8efe6;--accent:#f1df85;--white:#fffef9;--error:#a8312d}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:15px;line-height:1.5}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.42}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #b25a19;outline-offset:4px}button{touch-action:manipulation}a{color:inherit}button,select{-webkit-tap-highlight-color:transparent}.masthead{max-width:1200px;margin:auto;padding:28px 36px 24px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:11px;letter-spacing:2px;text-decoration:none;font-weight:800;font-size:13px}.brand-mark{font-size:29px;line-height:1}.header-note{font-family:Georgia,serif;font-style:italic;color:var(--muted);font-size:17px}main{max-width:1200px;margin:auto;padding:37px 36px 0}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:29px;gap:18px}.eyebrow{font-size:10px;font-weight:800;letter-spacing:1.8px;display:block}.page-heading h1{font-family:Georgia,'Times New Roman',serif;font-size:42px;font-weight:400;line-height:1.15;letter-spacing:-1.2px;margin:9px 0 0}.quiet-badge{white-space:nowrap;font-size:12px;color:var(--muted);padding-bottom:5px}.quiet-badge span{font-size:8px;margin-right:5px;color:var(--green)}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:52px;align-items:start}.play-area{max-width:650px}.puzzle-topline{display:flex;align-items:center;justify-content:space-between;font-size:12px;margin-bottom:12px;gap:10px}.puzzle-topline>div{display:flex;gap:10px;align-items:center}.level-label{font-weight:bold;background:var(--light);padding:5px 10px;border:1px solid var(--line);border-radius:4px}.puzzle-topline #clue-label{color:var(--muted)}.progress{font-variant-numeric:tabular-nums;color:var(--muted);white-space:nowrap}.board-wrap{position:relative}.board{border:2px solid var(--ink);background:var(--white);width:100%;aspect-ratio:1;display:grid;grid-template-rows:repeat(9,minmax(0,1fr));box-shadow:0 6px 16px #183c3408}.board-row{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));min-height:0}.cell{background:var(--white);padding:0;border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);color:#245d71;font-size:clamp(22px,3vw,34px);font-weight:400;position:relative;min-width:0;min-height:0;line-height:1;outline-offset:-4px!important;display:flex;align-items:center;justify-content:center}.cell:disabled{opacity:1}.cell[data-col="2"],.cell[data-col="5"]{border-right:2px solid var(--ink)}.cell[data-col="8"]{border-right:0}.board-row:nth-child(3) .cell,.board-row:nth-child(6) .cell{border-bottom:2px solid var(--ink)}.board-row:nth-child(9) .cell{border-bottom:0}.cell.peer{background:#f0f3eb}.cell.same{background:#d6e3d6}.cell.given{font-weight:700;color:var(--ink)}.cell.selected{background:var(--accent);box-shadow:inset 0 0 0 2px #9a8019;z-index:1}.cell.conflict{color:var(--error)}.cell.conflict:after{content:'!';position:absolute;right:3px;top:3px;font-size:10px;font-weight:700}.cell.wrong{box-shadow:inset 0 0 0 2px var(--error)}.cell .pencil{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:88%;height:86%;font-size:clamp(8px,1.1vw,12px);color:#496456;font-weight:400;line-height:1}.pencil span{display:flex;align-items:center;justify-content:center}.selection{margin:9px 0 13px;text-align:center;font-size:12px;min-height:18px;color:var(--muted)}.number-pad{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:7px}.number-button{background:var(--white);border:1px solid #bac9bc;border-radius:6px;color:var(--ink);font-family:Georgia,serif;font-size:26px;min-height:57px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;line-height:1}.number-button small{font-family:Arial,sans-serif;font-size:9px;color:var(--muted)}.number-button:hover:not(:disabled){background:var(--light)}.notes-active .number-button{font-family:Arial,sans-serif;font-size:20px;border-style:dashed}.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}.tool{border:0;background:transparent;color:var(--ink);padding:10px 3px;border-radius:5px;min-height:44px;font-size:12px}.tool>span:first-child{font-size:19px;vertical-align:middle;margin-right:4px}.tool:hover:not(:disabled){background:#e4e9df}.tool[aria-pressed=true]{background:var(--green);color:white}.mode-label{font-size:10px}.status{border-top:1px solid var(--line);margin:12px 0 0;padding:12px 0;min-height:47px;font-size:13px;color:var(--muted)}.status.error{color:var(--error)}.keyboard-help{font-size:11px;color:var(--muted);margin:10px 0 0}.sidebar{display:flex;flex-direction:column;gap:16px}.side-card{background:var(--white);border:1px solid var(--line);padding:22px;border-radius:8px}.side-card h2{font-family:Georgia,serif;font-weight:400;font-size:24px;margin:6px 0 16px;line-height:1.2}.side-card fieldset{padding:0;border:0;margin:0}.level-option{display:flex;align-items:center;gap:10px;padding:12px 10px;border:1px solid var(--line);border-radius:5px;margin-bottom:8px;cursor:pointer}.level-option:has(input:checked){background:var(--light);border-color:var(--green)}.level-option input{accent-color:var(--green);margin:0;width:16px;height:16px}.level-option strong{font-size:13px;display:block}.level-option small{display:block;font-size:11px;color:var(--muted);margin-top:1px}.level-dots{margin-left:auto;font-size:9px;white-space:nowrap;letter-spacing:2px}.tiny{font-size:11px!important;color:var(--muted);line-height:1.5!important;margin:10px 0 14px}.primary{border:1px solid var(--green);border-radius:5px;background:var(--green);color:#fffef9;padding:12px 16px;font-size:13px;font-weight:600;min-height:44px;display:flex;justify-content:space-between;gap:12px;align-items:center}.new-game .primary{width:100%;margin-top:16px}.primary:hover:not(:disabled),.small-primary:hover{background:#194b3c}.secondary{border:1px solid #aebfb1;background:transparent;color:var(--ink);padding:9px 12px;border-radius:5px;min-height:42px;font-size:12px;font-weight:600}.secondary:hover:not(:disabled){background:var(--light)}.help-actions,.save-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.help-card h2{font-size:21px;margin-top:0}.text-button{border:0;background:transparent;color:var(--green);text-decoration:underline;text-underline-offset:3px;font-size:12px;padding:8px 0;min-height:36px}.save-card{background:transparent}.save-title{display:flex;align-items:center;gap:9px}.save-title>span{font-size:27px}.save-title h2{font-size:21px;margin:0}.save-card>p{font-size:12px;margin:10px 0 16px;line-height:1.6}.save-card #save-status{margin:6px 0 0;overflow-wrap:anywhere}.hint-panel{background:#fff6d5;border:1px solid #d4bd64;padding:18px;border-radius:6px;margin:3px 0 14px}.hint-panel p{font-size:14px;margin:7px 0 13px}.hint-panel>div{display:flex;gap:20px;align-items:center}.small-primary{background:var(--green);border:0;border-radius:4px;color:white;padding:10px 15px;font-size:12px;min-height:40px}.complete{background:var(--light);border:1px solid #a9c2a9;border-radius:6px;padding:20px;display:flex;gap:16px;margin:8px 0}.complete h2{font:26px Georgia,serif;margin:0 0 6px}.complete p{font-size:13px;margin:0}.completion-mark{font-size:30px}.how-to{display:grid;grid-template-columns:1fr 1fr 1fr;gap:32px;margin-top:45px;padding:30px 0 34px;border-top:1px solid var(--line)}.how-to h2{font:25px/1.2 Georgia,serif;max-width:240px;margin:9px 0}.how-to p{font-size:13px;line-height:1.7;color:var(--muted);margin:0}footer{max-width:1200px;padding:23px 36px 30px;border-top:1px solid var(--line);margin:auto;display:flex;justify-content:space-between;gap:45px}footer>span{font-family:Georgia,serif;font-style:italic;font-size:14px;white-space:nowrap}footer p{font-size:10px;color:var(--muted);max-width:660px;margin:0;line-height:1.7}.loading{position:absolute;inset:0;background:#fffef9f5;display:flex;justify-content:center;align-items:center;gap:12px;font-size:14px}.spinner{height:18px;width:18px;border:2px solid #c9d4c5;border-top-color:var(--green);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}dialog{max-width:440px;width:calc(100% - 36px);background:var(--white);color:var(--ink);padding:28px;border:1px solid var(--line);border-radius:10px;box-shadow:0 20px 60px #14332b30}dialog::backdrop{background:#142e2755}dialog h2{font:27px Georgia,serif;margin:0 0 12px}dialog p{font-size:14px;color:var(--muted);margin:0 0 24px}.dialog-actions{display:flex;justify-content:flex-end;gap:10px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip{position:absolute;left:16px;top:-100px;background:var(--ink);color:white;padding:12px;z-index:100}.skip:focus{top:10px}.noscript{position:fixed;inset:auto 10px 10px;background:#fff6d5;color:var(--ink);padding:20px;border:1px solid #b38d1e;z-index:99}[hidden]{display:none!important}@media(max-width:920px){.game-layout{gap:25px;grid-template-columns:minmax(0,1fr) 285px}.side-card{padding:17px}.page-heading h1{font-size:36px}.masthead{padding:23px 25px}main{padding:27px 25px 0}.number-pad{gap:4px}.number-button{min-height:48px}.tool{font-size:11px}.mode-label{display:none}.puzzle-topline>div{gap:6px}.puzzle-topline #clue-label{font-size:10px}}@media(max-width:720px){.masthead{padding:20px}.header-note{font-size:14px}.brand{font-size:11px;letter-spacing:1.2px;gap:7px}.brand-mark{font-size:25px}main{padding:25px 20px 0}.page-heading{margin-bottom:23px}.page-heading h1{font-size:32px;max-width:270px}.page-heading .eyebrow{font-size:8px;letter-spacing:1.5px}.quiet-badge{display:none}.game-layout{display:flex;flex-direction:column;gap:28px}.play-area{width:100%;max-width:560px;align-self:center}.cell{font-size:clamp(21px,6vw,32px)}.cell .pencil{font-size:clamp(8px,2.2vw,12px)}.puzzle-topline{font-size:11px}.number-button{min-height:52px;font-size:25px}.sidebar{width:100%;display:grid;grid-template-columns:1fr 1fr;align-items:start}.new-game{grid-row:span 2}.save-card{grid-column:2}.side-card{padding:18px}.help-actions,.save-actions{grid-template-columns:1fr}.side-card h2{font-size:22px}.level-option{padding:10px 7px;gap:7px}.level-dots{font-size:8px;letter-spacing:0}.how-to{grid-template-columns:1fr 1fr;margin-top:30px;gap:20px}.how-to>div{grid-column:1/-1}.how-to h2{max-width:none;font-size:26px}.how-to p{font-size:12px}footer{padding:23px 20px;display:block}footer p{margin-top:12px}.keyboard-help{line-height:1.7}.status{font-size:12px}}@media(max-width:400px){main{padding-left:14px;padding-right:14px}.masthead{padding:18px 14px}.header-note{font-size:12px}.page-heading h1{font-size:30px}.sidebar{display:flex}.help-actions,.save-actions{grid-template-columns:1fr 1fr}.side-card{width:100%}.number-pad{gap:3px}.number-button{font-size:24px;min-height:46px}.number-button small{font-size:8px}.tool>span:first-child{margin-right:1px}.how-to{grid-template-columns:1fr}.how-to>div{grid-column:auto}.cell.conflict:after{right:2px;top:2px;font-size:8px}}@media(prefers-reduced-motion:reduce){.spinner{animation:none}}

/* Optional transfer tools stay collapsed so the playing layout remains compact. */
.save-transfer{margin-top:12px}.save-transfer summary{cursor:pointer;font-weight:600;min-height:36px;display:list-item}.save-transfer summary:focus-visible{outline:3px solid #b35800;outline-offset:3px}.save-transfer button{white-space:normal}