:root{color-scheme:light;--page:#f5f7fb;--surface:#fff;--surface2:#f4f7fb;--ink:#1b2e46;--muted:#6e7b8e;--accent:#176a74;--accent-dark:#0f535b;--aqua:#dff4ef;--line:#dbe3ed;--grid:#344c61;--box:#283c52;--cell:#fff;--peer:#eff7f7;--same:#d4eeee;--selected:#b8e5d9;--errors:#f8c2b9;--given:#202e40;--input:#236575;--cage:#69798a;--shadow:0 16px 48px rgba(26,46,76,.08);--radius:18px}
*{box-sizing:border-box}html{background:var(--page);-webkit-text-size-adjust:100%}body{margin:0;color:var(--ink);background:var(--page);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Arial,sans-serif}button,input{font:inherit}button{cursor:pointer;-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible{outline:3px solid #f2a568;outline-offset:2px}button:disabled{opacity:.37;cursor:not-allowed}a{color:var(--accent);text-decoration:none}.site-shell{max-width:1100px;margin:auto;padding:0 23px 54px}.site-top{display:flex;align-items:center;justify-content:space-between;min-height:67px;border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-size:15px;letter-spacing:.1em;font-weight:760}.brand b{color:var(--accent)}.brand-icon{height:34px;width:34px;border-radius:11px;background:var(--ink);color:#acebdd;display:grid;place-items:center;font-size:12px;letter-spacing:-1.5px}.all-games{font-size:13px;font-weight:700}.masthead{display:flex;justify-content:space-between;align-items:center;padding:22px 0 21px}.eyebrow,.side-eyebrow{font-weight:800;color:var(--accent);font-size:10px;letter-spacing:.14em}.masthead h1{font-weight:780;font-size:clamp(26px,4vw,35px);letter-spacing:-.035em;line-height:1.1;margin:5px 0}.masthead p{font-size:13px;color:var(--muted);margin:6px 0 0}.icon-plain{background:transparent;border:1px solid var(--line);border-radius:10px;padding:9px 12px;color:var(--muted);font-weight:700}.header-help{font-size:13px}.header-help span{font-size:12px;margin-left:6px}.game-layout{display:grid;grid-template-columns:minmax(0,585px) minmax(240px,1fr);align-items:start;gap:22px}.game-card,.side-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius)}.game-card{padding:17px;}.mode-tabs{display:grid;grid-template-columns:1fr 1fr;gap:4px;border-radius:12px;background:var(--surface2);padding:4px}.mode-tabs button{border:none;background:transparent;color:var(--muted);border-radius:9px;padding:12px 7px;font-weight:740;font-size:13px;white-space:nowrap}.mode-tabs button[aria-selected="true"]{color:var(--ink);background:var(--surface);box-shadow:0 2px 8px rgba(30,50,75,.11)}.tab-icon{font-size:18px;vertical-align:-1px;margin-right:5px;color:var(--accent)}.tab-check{color:var(--accent);padding-left:5px}.day-strip{display:flex;align-items:center;gap:5px;padding:17px 0 10px}.step-button{background:var(--surface2);border:1px solid var(--line);border-radius:10px;color:var(--ink);height:37px;min-width:35px;font-size:26px;line-height:1}.day-info{text-align:center;flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.day-info strong{font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.day-info span{font-size:11px;color:var(--muted)}.calendar-button{padding:9px 10px;border:1px solid var(--line);border-radius:10px;background:var(--surface2);color:var(--ink);font-size:12px;font-weight:700;white-space:nowrap}.calendar-button span{margin-left:4px}.grid-meta{display:flex;align-items:center;justify-content:space-between;min-height:30px;margin:0 1px 9px}.difficulty-group{display:flex;align-items:center;gap:9px}.difficulty-tag{display:inline-block;background:var(--aqua);border-radius:30px;color:var(--accent-dark);font-size:11px;font-weight:750;padding:5px 11px}.today-tag{font-size:10px;letter-spacing:.08em;color:var(--muted);font-weight:800}.clock-group button{border:0;background:transparent;color:var(--ink);font-weight:780;font-variant-numeric:tabular-nums;padding:4px 3px;display:flex;gap:6px;align-items:center}.clock-group button:first-letter{color:var(--muted)}.board-wrap{position:relative;width:100%;aspect-ratio:1;max-width:550px;margin:auto}.sudoku-board{position:relative;display:grid;width:100%;height:100%;grid-template-columns:repeat(9,minmax(0,1fr));grid-template-rows:repeat(9,minmax(0,1fr));border:3px solid var(--box);background:var(--cell);border-radius:3px;touch-action:none;user-select:none;-webkit-user-select:none;overflow:hidden}.cell{position:relative;display:flex;align-items:center;justify-content:center;min-width:0;min-height:0;background:var(--cell);border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:0;color:var(--ink);isolation:isolate;border-radius:0}.cell.box-right{border-right:3px solid var(--box)}.cell.box-bottom{border-bottom:3px solid var(--box)}.cell:last-child{border-right:0}.cell.is-peer{background:var(--peer)}.cell.is-same{background:var(--same)}.cell.is-selected{background:var(--selected)}.cell.is-incorrect{background:var(--errors)}.cell.is-conflict{box-shadow:inset 0 0 0 2px #d86c63}.cell.is-given .digit{color:var(--given);font-weight:800}.cell .digit{color:var(--input);font-size:clamp(19px,3vw,30px);font-weight:600;line-height:1;z-index:2;pointer-events:none}.cell .center-notes{position:absolute;inset:22% 3% 12%;display:flex;align-items:center;justify-content:center;align-content:center;flex-wrap:wrap;gap:0px 2px;color:var(--accent-dark);font-weight:650;font-size:clamp(8px,1.12vw,12px);line-height:1.25;pointer-events:none;z-index:2}.cell .corner-notes{position:absolute;inset:4% 3%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-template-rows:repeat(3,1fr);align-items:center;justify-items:center;font-size:clamp(7px,1vw,10px);font-weight:690;color:var(--ink);line-height:1;pointer-events:none;z-index:2}.cell .corner-notes span{opacity:.82}.cell .corner-notes .empty{opacity:0}.cell .cage-num{position:absolute;top:2px;left:3px;z-index:3;font-size:clamp(7px,.95vw,10px);font-weight:780;line-height:1;color:var(--accent-dark);pointer-events:none}.cell .cage-border{position:absolute;inset:2px;z-index:2;pointer-events:none;border:1px dashed transparent}.cell.cage-top .cage-border{border-top-color:var(--cage)}.cell.cage-right .cage-border{border-right-color:var(--cage)}.cell.cage-bottom .cage-border{border-bottom-color:var(--cage)}.cell.cage-left .cage-border{border-left-color:var(--cage)}.cell[data-color="1"]{--cell:#f2d3d4}.cell[data-color="2"]{--cell:#ffedc9}.cell[data-color="3"]{--cell:#d9f1c9}.cell[data-color="4"]{--cell:#d2e8fe}.cell[data-color="5"]{--cell:#e5d8fb}.cell[data-color="6"]{--cell:#f8d8ee}.cell[data-color="7"]{--cell:#bdf3ec}.cell[data-color="8"]{--cell:#fce2be}.cell[data-color="9"]{--cell:#dcdedc}.cell.has-cage-label .corner-notes{top:28%;bottom:2%}.cell[data-color]:not([data-color="0"]){background:var(--cell)}.cell.is-selected{outline:2px solid var(--accent);outline-offset:-2px;z-index:4}.pause-cover{position:absolute;inset:0;z-index:6;display:flex;align-items:center;justify-content:center;flex-direction:column;background:var(--surface);border:2px solid var(--grid);text-align:center}.pause-cover[hidden]{display:none}.pause-cover>span{font-size:49px;color:var(--accent)}.pause-cover h2{font-size:23px;margin:13px 0 4px}.pause-cover p{font-size:13px;color:var(--muted)}.solid-btn{background:var(--accent);border:0;border-radius:10px;color:white;padding:12px 20px;font-weight:700}.game-status{font-size:12px;color:var(--muted);min-height:39px;display:flex;align-items:center;justify-content:center;text-align:center;padding:7px 4px}.game-status.is-warning{color:#b9483b}.game-status.is-success{color:var(--accent-dark);font-weight:750}.tool-modes{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin-bottom:8px}.mode-button{display:flex;align-items:center;justify-content:center;gap:7px;background:var(--surface2);border:1px solid var(--line);border-radius:9px;color:var(--muted);min-height:44px;padding:5px 2px;font-size:12px;font-weight:720}.mode-button .mode-icon{font-size:17px;color:var(--muted);line-height:1}.mode-button .corner-icon{font-size:11px;align-self:center}.mode-button .centre-icon{font-size:10px}.mode-button .colour-icon{color:#c38cbf}.mode-button.is-active{background:var(--aqua);border-color:var(--accent);color:var(--accent-dark)}.mode-button.is-active .mode-icon{color:var(--accent-dark)}.number-pad{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:4px}.number-pad button{position:relative;border:1px solid var(--line);border-radius:10px;background:var(--surface2);color:var(--ink);font-size:23px;font-weight:680;min-height:51px;padding:2px 0;touch-action:manipulation;user-select:none}.number-pad button .remaining{position:absolute;right:3px;bottom:2px;font-size:9px;font-weight:600;color:var(--muted)}.number-pad button.is-highlighted{background:var(--aqua);border-color:var(--accent)}.number-pad button.is-locked{box-shadow:inset 0 0 0 2px var(--accent)}.number-pad button[data-color="1"]{background:#f2d3d4}.number-pad button[data-color="2"]{background:#ffedc9}.number-pad button[data-color="3"]{background:#d9f1c9}.number-pad button[data-color="4"]{background:#d2e8fe}.number-pad button[data-color="5"]{background:#e5d8fb}.number-pad button[data-color="6"]{background:#f8d8ee}.number-pad button[data-color="7"]{background:#bdf3ec}.number-pad button[data-color="8"]{background:#fce2be}.number-pad button[data-color="9"]{background:#dcdedc}.action-tools{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:4px;border-top:1px solid var(--line);padding-top:13px;margin-top:13px}.action-tools button{border:0;border-radius:8px;background:transparent;color:var(--muted);font-size:11px;font-weight:750;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-height:46px;padding:3px 0}.action-tools button span{font-size:21px;line-height:1;color:var(--ink)}.action-tools button[aria-pressed="true"]{color:var(--accent-dark);background:var(--aqua)}.sidebar{display:flex;flex-direction:column;gap:15px}.side-card{padding:23px}.side-card h2{font-size:21px;line-height:1.25;margin:13px 0 9px;letter-spacing:-.02em}.side-card p{font-size:13px;color:var(--muted);line-height:1.65;margin:0}.text-btn{border:0;padding:12px 0 0;background:transparent;color:var(--accent);font-size:12px;font-weight:800}.text-btn span{padding-left:5px}.progress-grid{display:grid;grid-template-columns:1fr 1fr;margin-top:17px;gap:6px}.progress-grid>div{display:flex;flex-direction:column;gap:4px}.progress-grid b{font-size:28px;letter-spacing:-.05em}.progress-grid span{font-size:11px;color:var(--muted)}.side-card p.side-small{border-top:1px solid var(--line);padding-top:14px;margin-top:19px;font-size:11px;line-height:1.6}.quick-tools>button{width:100%;display:grid;align-items:center;grid-template-columns:27px 1fr 12px;gap:10px;text-align:left;background:transparent;border:0;color:var(--ink);font-weight:700;font-size:12px;padding:16px 0;border-bottom:1px solid var(--line)}.quick-tools>button:last-child{border-bottom:0}.quick-tools>button>span:first-child{font-size:20px;color:var(--accent)}.quick-tools button small{display:block;font-size:11px;font-weight:400;color:var(--muted);margin-top:3px}.side-note{font-size:11px;line-height:1.7;color:var(--muted);padding:4px 12px}.side-note strong{color:var(--accent)}.modal-dialog{background:var(--surface);border:1px solid var(--line);border-radius:17px;color:var(--ink);box-shadow:0 20px 75px rgba(12,27,47,.26);width:min(93vw,510px);max-height:min(85vh,850px);padding:0;overscroll-behavior:contain}.modal-dialog::backdrop{background:rgba(18,32,52,.52)}.dialog-top{display:flex;justify-content:space-between;align-items:center;padding:21px 21px 14px;border-bottom:1px solid var(--line)}.dialog-top h2{font-size:21px;margin:0;letter-spacing:-.02em}.dialog-top button{border:0;background:var(--surface2);border-radius:8px;width:32px;height:32px;color:var(--ink)}.modal-body{padding:21px;overflow:auto;max-height:calc(85vh - 78px);font-size:13px;line-height:1.6;color:var(--ink)}.modal-body p{margin:4px 0 12px}.modal-body h3{font-size:15px;margin:22px 0 4px}.modal-body li{padding:3px 0}.modal-body ul{padding-left:23px;margin:10px 0 17px}.modal-body small,.modal-muted{color:var(--muted)}.modal-body .button-row{display:flex;gap:9px;flex-wrap:wrap;justify-content:flex-end;margin-top:18px}.modal-body .secondary-btn{border:1px solid var(--line);background:var(--surface2);color:var(--ink);border-radius:9px;padding:10px 15px;font-weight:750}.modal-body .danger-btn{background:#b74440;color:white;border:0;border-radius:9px;padding:10px 15px;font-weight:750}.archive-month{font-size:12px;letter-spacing:.08em;font-weight:800;color:var(--muted);margin:17px 0 8px}.archive-list{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:5px}.archive-list button{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:2px;border:1px solid var(--line);background:var(--surface2);border-radius:8px;color:var(--ink);min-height:46px;font-weight:700;font-size:13px}.archive-list button small{font-size:11px;line-height:1;color:var(--accent)}.archive-list button.is-current{border-color:var(--accent);background:var(--aqua)}.archive-list button .day-dot{min-height:10px;font-size:10px}.settings-row{display:flex;justify-content:space-between;align-items:center;padding:11px 0;gap:10px;border-bottom:1px solid var(--line);font-weight:680}.settings-row small{display:block;font-weight:400;color:var(--muted);margin-top:2px}.settings-row select{border:1px solid var(--line);border-radius:7px;padding:7px 11px;background:var(--surface2);color:var(--ink);font-weight:700}.settings-row input{accent-color:var(--accent);min-width:20px;min-height:20px}.success-panel{text-align:center}.success-panel>span{font-size:50px;color:var(--accent)}.success-panel h3{font-size:22px;margin:8px 0}.hint-box{background:var(--surface2);border:1px solid var(--line);border-radius:9px;padding:13px}.kbd{font-family:monospace;background:var(--surface2);border-radius:4px;padding:2px 5px;border:1px solid var(--line);font-size:11px}body.dark{color-scheme:dark;--page:#101925;--surface:#1a2736;--surface2:#243448;--ink:#eef4f7;--muted:#a2b2c4;--accent:#9de3d5;--accent-dark:#a5efe1;--aqua:#1b4a4b;--line:#3b4b5d;--grid:#8298ae;--box:#cad7e5;--cell:#203044;--peer:#293f4b;--same:#28565d;--selected:#376f6b;--errors:#6e3640;--given:#f1f7fb;--input:#97e1dd;--cage:#a6c3d1;--shadow:0 12px 50px rgba(0,0,0,.1)}body.dark .number-pad button[data-color]:not([data-color="0"]){color:#102030}body.dark .cell[data-color]:not([data-color="0"]) .digit{color:#24384a}body.dark .cell[data-color]:not([data-color="0"]) .corner-notes,body.dark .cell[data-color]:not([data-color="0"]) .center-notes{color:#24384a}
@media(max-width:800px){.site-shell{max-width:620px;padding:0 13px 36px}.site-top{min-height:49px}.masthead{padding:13px 1px 13px}.masthead h1{font-size:26px;margin:3px 0}.masthead p{display:none}.eyebrow{font-size:9px}.header-help{padding:5px 9px}.header-help span{display:none}.game-layout{grid-template-columns:1fr;gap:14px}.sidebar{display:grid;grid-template-columns:1fr 1fr;gap:12px}.sidebar .game-overview{display:none}.side-note{grid-column:1/-1}.side-card{padding:16px}.game-card{padding:12px}.day-strip{padding-top:10px}.all-games{font-size:11px}.side-card h2{font-size:17px}.side-card p{font-size:12px}}
@media(max-width:470px){.site-shell{padding:0 9px 30px}.site-top{min-height:43px}.masthead{padding:9px 5px 8px}.masthead h1{font-size:24px}.eyebrow{font-size:8px}.brand{font-size:12px}.brand-icon{width:27px;height:27px;border-radius:8px}.mode-tabs button{padding:8px 5px;font-size:12px}.game-card{padding:9px}.day-strip{padding:8px 0 6px}.step-button{height:31px;min-width:29px;font-size:22px}.day-info strong{font-size:12px}.day-info span{font-size:10px}.calendar-button{height:31px;padding:5px 8px}.calendar-button span{display:none}.grid-meta{margin-bottom:6px}.difficulty-tag{font-size:10px;padding:4px 9px}.board-wrap{width:100%}.cell .digit{font-size:clamp(19px,5vw,27px)}.cell .center-notes{font-size:clamp(8px,2.2vw,10px);gap:0 1px}.cell .corner-notes{font-size:clamp(8px,2.1vw,10px)}.cell .cage-num{font-size:clamp(8px,2.05vw,10px)}.game-status{min-height:31px;padding:5px 0;font-size:11px}.mode-button{min-height:40px;gap:5px;font-size:11px}.mode-button .mode-icon{font-size:15px}.number-pad{gap:3px}.number-pad button{min-height:47px;border-radius:7px;font-size:21px}.action-tools{margin-top:9px;padding-top:8px}.action-tools button{min-height:41px;font-size:10px;gap:4px}.action-tools button span{font-size:19px}.sidebar{grid-template-columns:1fr 1fr}.side-card{padding:13px}.progress-grid b{font-size:23px}.side-card p.side-small{font-size:10px;margin-top:12px;padding-top:10px}.quick-tools>button{padding:10px 0;grid-template-columns:18px 1fr 9px;gap:5px;font-size:11px}.quick-tools>button>span:first-child{font-size:16px}.quick-tools button small{font-size:9px}.side-eyebrow{font-size:9px}}
@media(max-width:360px){.mode-button{font-size:10px;gap:3px}.mode-button .mode-icon{font-size:13px}.today-tag{display:none}.number-pad button{min-height:42px;font-size:18px}.day-info strong{font-size:11px}.cell .cage-num{font-size:7px}}
@media(prefers-reduced-motion:no-preference){button{transition:background-color .12s,border-color .12s}}@media print{.site-top,.masthead,.tool-modes,.number-pad,.action-tools,.sidebar,.game-status{display:none}.game-layout{display:block}.game-card{box-shadow:none;border:0}.site-shell{max-width:640px}.sudoku-board{border-color:#111}.cell{color:#111}}

/* v2 — Uncle Logic brand, concise weekly calendar, and high-contrast dark solver */
.brand{display:inline-flex;align-items:center;background:#0c1729;padding:2px 8px 2px 3px;border-radius:12px;line-height:0;overflow:hidden}
.brand img{display:block;width:210px;height:auto;max-width:100%}
.site-top{min-height:74px}
.masthead{padding:18px 0 17px}
.masthead h1{margin:0}
.game-card{overflow:hidden}
.calendar-widget{padding:10px 0 8px}
.calendar-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 7px}
.calendar-nav strong{font-size:13px;font-weight:770;letter-spacing:.015em;text-align:center;white-space:nowrap;color:var(--ink);font-variant-numeric:tabular-nums}
.calendar-nav .step-button{width:32px;height:30px;min-width:32px;font-size:21px;border-radius:8px}
.week-rail{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:5px;touch-action:pan-y}
.week-day-button{position:relative;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:3px;border:1px solid var(--line);border-radius:10px;min-width:0;min-height:59px;background:var(--surface2);color:var(--ink);font-variant-numeric:tabular-nums;padding:7px 2px 9px}
.week-day-button .week-day-name{font-size:10px;font-weight:680;color:var(--muted);line-height:1}
.week-day-button .week-day-number{font-size:19px;font-weight:760;line-height:1.1}
.week-day-button .week-complete{position:absolute;right:3px;top:3px;font-size:11px;line-height:1;color:var(--accent);font-weight:850}
.week-day-button.is-current{border-color:var(--accent);background:var(--aqua);box-shadow:inset 0 0 0 1px var(--accent)}
.week-day-button.is-current .week-day-name{color:var(--accent-dark)}
.week-day-button.is-today:not(.is-current){border-bottom:3px solid var(--accent)}
.week-day-button:disabled{opacity:.46;background:transparent}
.week-day-button:disabled .week-day-number{font-weight:570}
.selected-date{color:var(--muted);font-size:11px;font-weight:650}
.today-tag{font-size:9px}
.action-tools{grid-template-columns:repeat(5,minmax(0,1fr))}
.number-pad button.is-exhausted[data-color="0"]{background:#e1e6eb;color:#758393;border-color:#c6d0da;box-shadow:none;filter:grayscale(1)}
.number-pad button.is-exhausted.is-highlighted{outline:1px solid var(--accent);outline-offset:-2px}
.progress-card{padding-bottom:22px}
.progress-grid{margin-top:13px}
.quick-tools>button{padding:14px 0}
.quick-tools>button span[aria-hidden="true"]:first-child{font-weight:800;text-align:center}
.cell{border-right-color:var(--cell-line,var(--line));border-bottom-color:var(--cell-line,var(--line))}
body.dark{
  color-scheme:dark;
  --page:#0b1422;--surface:#142338;--surface2:#203249;
  --ink:#f6f9ff;--muted:#bacada;--accent:#82e7d3;
  --accent-dark:#cffcf3;--aqua:#1d4e51;
  --line:#3c5169;--cell-line:#64809a;--grid:#a6c4d9;
  --box:#d6e6f4;--cell:#192d42;--peer:#284056;
  --same:#28615f;--selected:#2d6e70;--errors:#713745;
  --given:#f7fbff;--input:#9cf7e2;--cage:#b7cadc;
  --shadow:0 14px 44px rgba(0,0,0,.22)
}
body.dark .cell .digit{font-weight:700}
body.dark .cell.is-given .digit{font-weight:800}
body.dark .cell .corner-notes{color:#f0f7ff}
body.dark .cell .center-notes{color:#d1fff4}
body.dark .cell.is-conflict{box-shadow:inset 0 0 0 2px #ff928f}
body.dark .game-status.is-warning{color:#ffb7b0}
body.dark .game-status.is-success{color:#a0f9c8}
body.dark .mode-button.is-active{color:#e5fff9}
body.dark .mode-button.is-active .mode-icon{color:#e5fff9}
body.dark .mode-tabs button[aria-selected="true"]{box-shadow:0 2px 9px rgba(0,0,0,.35)}
body.dark .number-pad button{font-weight:760}
body.dark .number-pad button.is-exhausted[data-color="0"]{background:#253346;color:#8293a6;border-color:#42546b;box-shadow:none}
body.dark .solid-btn{color:#102830}
body.dark .number-pad button[data-color]:not([data-color="0"]){color:#142537}
body.dark .cell[data-color]:not([data-color="0"]) .digit{color:#182a3c}
body.dark .cell[data-color]:not([data-color="0"]) .corner-notes,
body.dark .cell[data-color]:not([data-color="0"]) .center-notes{color:#182a3c}
body.dark .cell[data-color]:not([data-color="0"]) .cage-num{color:#0e4b55}
@media(max-width:800px){
  .site-top{min-height:63px}
  .brand img{width:175px}
  .masthead{padding:11px 2px 11px}
  .calendar-widget{padding:8px 0 9px}
  .sidebar{grid-template-columns:1fr 1fr;gap:11px}
}
@media(max-width:470px){
  .site-shell{padding:0 9px 30px}
  .site-top{min-height:55px}
  .brand{padding:2px 5px 2px 2px;border-radius:9px}
  .brand img{width:150px}
  .masthead{padding:9px 5px 9px}
  .masthead h1{font-size:23px}
  .calendar-widget{padding:8px 0 7px}
  .calendar-nav{margin-bottom:6px}
  .calendar-nav strong{font-size:12px}
  .calendar-nav .step-button{width:31px;min-width:31px;height:29px}
  .week-rail{gap:3px}
  .week-day-button{min-height:54px;padding:7px 1px;border-radius:7px}
  .week-day-button .week-day-name{font-size:9px}
  .week-day-button .week-day-number{font-size:17px}
  .week-day-button .week-complete{font-size:9px;top:2px;right:2px}
  .selected-date{display:none}
  .action-tools{gap:4px}
  .game-status{min-height:36px}
  .sidebar{gap:8px}
  .side-card{padding:12px}
}
@media(max-width:340px){
  .brand img{width:135px}
  .week-day-button .week-day-number{font-size:16px}
  .week-rail{gap:2px}
}

html.dark{color-scheme:dark;background:#0b1422}

/* v3 — Light by default; Killer dark numbers must not be green on blue. */
.game-status:empty{min-height:5px;padding:0 4px}
body.dark.is-killer{
  --cell:#152538;
  --peer:#223a50;
  --same:#344858;
  --selected:#34566a;
  --input:#fff0da;    /* warm ivory, not green on blue */
  --given:#ffffff;
  --cage:#e4edf6;
  --grid:#c4d5e4;
  --box:#ebf3fc;
}
body.dark.is-killer .cell .digit{font-weight:780;text-shadow:0 1px 1px rgba(0,0,0,.35)}
body.dark.is-killer .cell.is-given .digit{font-weight:850}
body.dark.is-killer .cell .cage-num{color:#ffe4b1;font-weight:850;text-shadow:0 1px 2px #132336}
body.dark.is-killer .cell .corner-notes,
body.dark.is-killer .cell .center-notes{color:#ecf4ff}
body.dark.is-killer .cell[data-color]:not([data-color="0"]) .digit,
body.dark.is-killer .cell[data-color]:not([data-color="0"]) .corner-notes,
body.dark.is-killer .cell[data-color]:not([data-color="0"]) .center-notes{color:#233247;text-shadow:none}
body.dark.is-killer .cell[data-color]:not([data-color="0"]) .cage-num{color:#503e21;text-shadow:none}

.sudoku-heading{display:flex;align-items:center;gap:12px}.sudoku-heading img{width:58px;height:58px;object-fit:contain;border-radius:12px}.sudoku-site-footer{max-width:1100px;margin:0 auto;padding:18px 23px 30px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:18px;font-size:12px;font-weight:650}.sudoku-site-footer a{color:var(--muted)}.sudoku-site-footer a:hover{color:var(--accent)}@media(max-width:470px){.sudoku-heading img{width:40px;height:40px}.sudoku-site-footer{padding:15px 12px 24px;gap:13px}}

.sudoku-guide{max-width:1120px;margin:52px auto 32px;padding:28px;border:1px solid var(--line);border-radius:18px;background:var(--surface);color:var(--ink)}.sudoku-guide h2{margin:0 0 12px;font-size:clamp(1.5rem,3vw,2rem)}.sudoku-guide>p{max-width:75ch;line-height:1.6}.sudoku-guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:22px 0}.sudoku-guide h3{margin:0 0 8px;font-size:1.1rem}.sudoku-guide-grid p{margin:0;line-height:1.55}.sudoku-guide a{color:var(--accent);font-weight:750}@media(max-width:750px){.sudoku-guide{margin:36px 12px 24px;padding:20px}.sudoku-guide-grid{grid-template-columns:1fr;gap:18px}}
.next-daily-countdown strong{display:inline-block;margin-top:6px;color:var(--accent-dark);font-size:clamp(24px,6vw,32px);font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:.04em}