:root{font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#283b39;background:#f7f7f2;font-synthesis:none;font-size:14px;--ink: #283b39;--muted: #606c66;--accent: #5c55a3;--line: #dce1da;--lavender: #eeedf7;--paper: #fff;--yellow: #f7e5a4}*{box-sizing:border-box}body{margin:0}button,input,a{-webkit-tap-highlight-color:transparent}button,a,input{touch-action:manipulation}button,input{font:inherit}button{color:inherit;cursor:pointer}button{border:0;background:none}button:disabled{cursor:default;opacity:.4}a{color:inherit;text-decoration:none}button,a,label{-webkit-user-select:none;user-select:none}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:4px}::selection{background:#dcd8f5;color:#283b39}input{accent-color:var(--accent);caret-color:var(--accent)}html{scrollbar-color:#c7ccc4 #f7f7f2;scroll-behavior:smooth;scroll-padding-top:24px}h1,h2,h3,h4,p{margin:0}h1,h2,h3{text-wrap:balance}p{line-height:1.7}button{transition:background .16s,color .16s,box-shadow .16s}svg{flex-shrink:0}.icon{width:20px;height:20px;vertical-align:middle}.site-header{height:100px;max-width:1264px;padding:0 48px;margin:0 auto;display:flex;align-items:center;border-bottom:1px solid var(--line);gap:64px}.brand{display:flex;align-items:center;gap:11px;font-family:Georgia,serif;font-size:25px;letter-spacing:-1px;white-space:nowrap}.brand-icon{width:36px;height:36px;color:var(--accent)}.brand-light{color:#606c66}.site-header nav{display:flex;align-self:stretch;align-items:center;gap:30px;font-size:13px;font-weight:500}.site-header nav a,.site-header nav button{height:100%;display:flex;align-items:center;padding:0 1px;border-bottom:2px solid transparent;color:var(--muted)}.site-header nav .nav-active{color:var(--ink);border-bottom-color:var(--accent)}.site-header nav button:hover{color:var(--accent)}.header-note{margin-left:auto;color:var(--muted);font-family:Georgia,serif;font-style:italic;font-size:14px}main{max-width:1120px;margin:0 auto;padding:43px 40px 0}.intro{display:flex;justify-content:space-between;align-items:center;margin-bottom:42px;gap:24px}.intro h1{font-family:Georgia,serif;font-size:38px;font-weight:400;letter-spacing:-1.1px;line-height:1.25}.intro h1 em{color:var(--accent);font-weight:400}.intro p{color:var(--muted);margin-top:10px;font-size:14px}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:1px solid var(--line);border-radius:8px;padding:13px 18px;min-height:46px;font-size:13px;font-weight:600;line-height:1.3;background:var(--paper)}.button:hover{background:#f0f1eb}.new-game{white-space:nowrap}.new-game .icon{width:17px;height:17px}.primary{background:var(--accent);color:#fff;border-color:transparent;min-height:48px}.primary:hover{background:#4c458c}.primary .icon:last-child:not(:first-child){margin-left:auto;width:17px}.primary .icon:first-child:not(:last-child){width:19px}.wide{width:100%}.workspace{display:grid;grid-template-columns:minmax(0,530px) minmax(0,354px);gap:64px;justify-content:space-between}.game-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px;gap:12px}.game-heading>div:first-child{display:flex;align-items:center;gap:12px}.game-heading h2{font-size:16px;font-weight:600;letter-spacing:-.3px}.difficulty{font-size:11px;font-weight:500;color:#426556;background:#e9efe7;padding:5px 9px;border-radius:5px}.timer-wrap{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums;white-space:nowrap}.timer-wrap>.icon{width:15px;height:15px}.icon-button{width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px}.icon-button:hover{background:#e8e9e1}.icon-button .icon{width:17px;height:17px}.board-frame{position:relative;margin-left:15px}.column-labels{position:absolute;display:grid;grid-template-columns:repeat(9,1fr);top:-20px;left:0;right:0;font-size:9px;color:#637063;text-align:center}.row-labels{position:absolute;display:grid;grid-template-rows:repeat(9,1fr);left:-20px;top:0;bottom:0;font-size:9px;color:#637063;align-items:center;width:12px;text-align:center}#board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));border:2px solid #52615c;background:#fff;border-radius:3px;overflow:hidden;aspect-ratio:1}.grid-row{display:contents}.cell{position:relative;padding:0;display:flex;align-items:center;justify-content:center;border-radius:0;border:0;border-right:1px solid #dce1da;border-bottom:1px solid #dce1da;background:#fff;min-width:0;min-height:0;font-size:28px;font-weight:450;font-variant-numeric:tabular-nums;line-height:1}.cell:nth-child(9){border-right:0}.grid-row:last-child .cell{border-bottom:0}.cell.box-right{border-right:2px solid #75817a}.cell.box-bottom{border-bottom:2px solid #75817a}.cell.related{background:#f5f6f2}.cell.entered{color:var(--accent)}.cell.matching{background:#e7e3f4;color:#4d468e}.cell.hint-source{background:#e3dff4;color:#4d468e}.cell.hint-target{background:var(--yellow);color:#53411e}.cell.selected{background:#dedaf3;box-shadow:inset 0 0 0 2px var(--accent);z-index:1}.cell.hint-target.selected{background:var(--yellow);box-shadow:inset 0 0 0 2px #9f7c2a}.cell.invalid{color:#a7343d;background:#fbecef}.cell.invalid:after{content:"";position:absolute;width:14px;height:2px;bottom:7px;background:#a7343d}.cell:focus{outline:0}.cell:focus-visible{outline:3px solid var(--accent);outline-offset:-3px;z-index:2}.candidates{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:100%;height:100%;padding:4px;color:#64716b;font-size:10px;line-height:1}.candidates span{display:flex;align-items:center;justify-content:center}.candidates .eliminate{color:#a7343d;text-decoration:line-through;font-weight:700}.candidates .candidate-focus{font-weight:700;color:#4d468e}.board-status{display:flex;justify-content:space-between;gap:12px;font-size:10px;color:var(--muted);padding:12px 0 15px 15px;min-height:43px}.board-status>span:last-child{display:flex;align-items:center;gap:8px;white-space:nowrap}.progress-track{width:48px;height:3px;background:#e1e4dc;border-radius:4px;overflow:hidden}.progress-track i{display:block;height:100%;background:var(--accent)}.tools{margin-left:15px;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:8px 0;gap:6px}.tools button{display:flex;align-items:center;justify-content:center;gap:7px;font-size:12px;padding:10px 2px;border-radius:6px;min-height:44px}.tools .icon{width:18px;height:18px}.tools button:hover{background:#ebece5}.tools button[aria-pressed=true]{background:var(--lavender);color:var(--accent)}.tools small{font-size:8px;letter-spacing:.03em;margin-left:2px;font-weight:600;color:#637063}.tools [aria-pressed=true] small{color:var(--accent)}.number-pad{display:grid;grid-template-columns:repeat(9,1fr);gap:6px;margin:16px 0 0 15px}.number-pad button{height:64px;border-radius:8px;background:#eeefe9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}.number-pad button:hover{background:#e2def0}.number-pad button>span{font-size:25px;color:var(--accent);font-variant-numeric:tabular-nums}.number-pad button>small{font-size:9px;color:var(--muted);font-variant-numeric:tabular-nums}.number-pad .digit-complete{background:#f0f1eb}.number-pad.pencil-mode button{box-shadow:inset 0 0 0 1px #c8c2df}.number-pad.pencil-mode button>span{font-size:20px}.board-options{display:flex;align-items:center;justify-content:space-between;margin:18px 0 0 15px;gap:10px;font-size:10px;color:var(--muted)}.switch-label{position:relative;display:flex;align-items:center;gap:7px;cursor:pointer;min-height:30px}.switch-label input{position:absolute;opacity:0;width:30px;height:20px;left:0;margin:0}.switch{width:27px;height:16px;background:#d8dcd3;border-radius:10px;position:relative;pointer-events:none}.switch:after{content:"";position:absolute;left:3px;top:3px;width:10px;height:10px;background:#fff;border-radius:50%;box-shadow:0 1px 2px #283b3922}.switch-label input:checked+.switch{background:var(--accent)}.switch-label input:checked+.switch:after{left:14px}.switch-label input:focus-visible+.switch{outline:3px solid var(--accent);outline-offset:3px}.saved{display:flex;align-items:center;gap:4px;white-space:nowrap}.saved .icon{width:12px;height:12px}.coach-panel{background:#eeedf5;padding:25px 28px 23px;border-radius:12px;min-height:488px}.coach-heading{display:flex;align-items:center;gap:9px;margin-bottom:24px}.coach-heading h2{font-size:13px;font-weight:600;color:#514e70}.coach-symbol{width:29px;height:29px;border:1px solid #d2cde5;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--accent)}.coach-symbol .icon{width:17px;height:17px}.online-dot{margin-left:auto;width:6px;height:6px;background:#8a84b4;border-radius:50%}.coach-panel h3{font-family:Georgia,serif;font-weight:400;font-size:32px;line-height:1.2;letter-spacing:-.6px;color:#353449;margin-bottom:14px}.coach-panel p{font-size:12px;color:#66627c;line-height:1.85}.coach-art{height:176px;position:relative;display:flex;align-items:center;justify-content:center;padding-bottom:21px}.art-grid{width:111px;height:111px;display:grid;grid-template-columns:repeat(3,1fr);transform:rotate(-7deg);background:#fff;border:1px solid #c9c4de;border-radius:4px;box-shadow:3px 8px 17px #58526b0c}.art-grid>span{display:flex;align-items:center;justify-content:center;border-right:1px solid #dfdce9;border-bottom:1px solid #dfdce9;color:#6e657f;font-size:17px}.art-grid>span:nth-child(3n){border-right:0}.art-grid>span:nth-child(n+7){border-bottom:0}.art-grid .art-focus{background:var(--yellow);color:#76602c;font-family:Georgia,serif;font-size:25px}.art-grid .art-notes{font-size:8px;letter-spacing:3px;line-height:1.8}.aha-spark{position:absolute;left:calc(50% + 59px);top:29px;color:#8175b3;transform:rotate(15deg)}.aha-spark .icon{width:25px;height:25px}.art-caption{position:absolute;bottom:11px;font-family:Georgia,serif;font-style:italic;color:#686079;font-size:12px;transform:rotate(-4deg)}.coach-panel .coach-reassurance{font-size:10px;text-align:center;margin-top:10px;color:#686079;line-height:1.5}.coach-footnote{display:flex;justify-content:center;align-items:flex-start;gap:9px;padding:23px 2px 21px}.coach-footnote>.icon{width:17px;height:17px;color:#738a74;margin-top:3px}.coach-footnote p{font-size:11px;line-height:1.8;color:#63705f}.shortcut-link{border-top:1px solid var(--line);width:100%;display:flex;gap:8px;align-items:center;padding:16px 0;font-size:11px;color:var(--muted)}.shortcut-link>.icon{width:17px;height:17px}.shortcut-link>span{margin-left:auto;border:1px solid #d9ded4;border-radius:4px;width:20px;height:20px;display:grid;place-items:center;font-size:10px}.shortcut-link:hover{color:var(--accent)}.hint-tag{display:inline-flex;align-items:center;gap:10px;background:#e0dced;color:#5c5480;padding:6px 9px;border-radius:5px;font-size:10px;font-weight:600;margin-bottom:18px}.hint-tag .icon{width:13px;height:13px}.hint-content{animation:hint-reveal .3s cubic-bezier(.16,1,.3,1)}.hint-content h3{font-size:27px}.nudge-note{font-size:12px;color:#68617f;line-height:1.8;margin:24px 0;background:#ffffff70;border-radius:8px;padding:16px}.dismiss{display:flex!important;margin:15px auto 0!important;font-size:11px!important;color:#665d7e!important}.hint-explanation{margin-top:15px;margin-bottom:23px}.hint-explanation>p{font-size:13px}.hint-legend{display:flex;gap:12px;font-size:9px;color:#6d6680;margin-top:17px;flex-wrap:wrap}.hint-legend span{display:flex;align-items:center;gap:5px}.hint-legend i{width:9px;height:9px;border-radius:2px;display:inline-block}.legend-source{background:#c9bfe9}.legend-target{background:#edcf72}.why{margin-top:24px;padding-top:18px;border-top:1px solid #dcd8e8}.why h4{font-size:11px;font-weight:600;color:#504965;margin-bottom:6px}.why p{font-size:11px}.coach-complete>.icon{width:44px;height:44px;color:var(--accent);margin-bottom:20px}.coach-complete h3{font-size:34px}.completion-count{display:flex;align-items:center;gap:14px;font-family:Georgia,serif;color:var(--accent);font-size:45px;margin:22px 0}.completion-count span{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px}.pause-cover{position:absolute;inset:0;background:#f5f4ed;z-index:5;display:grid;place-items:center;text-align:center}.pause-cover[hidden]{display:none}.pause-cover .icon{color:var(--accent);width:32px;height:32px}.pause-cover h3{font-family:Georgia,serif;font-size:27px;font-weight:400;margin:15px 0 8px}.pause-cover p{color:var(--muted);font-size:13px;margin-bottom:23px}.pause-cover .button .icon{width:17px;height:17px;color:#fff}.techniques{margin-top:50px;padding-top:29px;border-top:1px solid var(--line);padding-bottom:37px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.section-heading h2{font-family:Georgia,serif;font-weight:400;font-size:21px;letter-spacing:-.3px}.section-heading p{font-size:11px;color:var(--muted);margin-top:6px}.text-button{color:var(--accent);display:inline-flex;align-items:center;gap:8px;padding:5px 0;font-size:11px;font-weight:500;line-height:1.5}.text-button:hover{text-decoration:underline;text-underline-offset:4px}.text-button .icon{width:16px;height:16px}.technique-list{display:grid;grid-template-columns:repeat(4,1fr);margin-top:24px;gap:26px}.technique-item{display:flex;align-items:center;padding:0;text-align:left;gap:13px}.technique-item:hover strong{color:var(--accent)}.technique-copy{display:flex;flex-direction:column;gap:6px}.technique-copy strong{font-size:12px;font-weight:600}.technique-copy small{font-size:10px;color:var(--muted)}.technique-item>.icon{width:13px;height:13px;margin-left:auto;color:#929b90}.technique-diagram{width:46px;height:46px;border:1px solid #d4d9cf;display:grid;grid-template-columns:repeat(3,1fr);flex-shrink:0;gap:1px;background:#dde1d8;border-radius:4px;overflow:hidden}.technique-diagram i{background:#f9f9f5;display:grid;place-items:center;font-size:9px;font-style:normal;color:var(--accent);font-weight:500}.technique-diagram .lit{background:#e1dcef}.technique-diagram.t-1 .lit{font-size:6px}.technique-diagram.t-2 .lit{background:#ede3b9;color:#716231}.technique-diagram.t-3 .lit{background:#deeadf;color:#4d7055}footer{border-top:1px solid var(--line);max-width:1168px;margin:0 auto;padding:23px 24px 30px;display:flex;justify-content:space-between;align-items:center;color:#63705f;font-size:10px;gap:14px}footer>span:last-child{display:flex;gap:4px;align-items:center}footer em{font-family:Georgia,serif;font-size:12px;color:var(--accent)}footer .footer-dot{margin:0 10px}footer button{padding:2px;color:var(--muted);font-size:10px}footer button:hover{color:var(--accent)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);z-index:30;color:#fff;background:#30463e;box-shadow:0 5px 24px #243b3929;border-radius:10px;padding:15px 22px;font-size:13px;line-height:1.6;max-width:calc(100vw - 32px);width:max-content;pointer-events:none}.toast[hidden]{display:none}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;padding:0;margin:-1px;clip:rect(0,0,0,0);white-space:nowrap;border:0}dialog{border:0;border-radius:16px;background:#fcfcf8;color:var(--ink);width:500px;max-width:calc(100vw - 28px);max-height:calc(100dvh - 40px);padding:28px 32px 32px;box-shadow:0 18px 80px #26363030;overscroll-behavior:contain}dialog::backdrop{background:#283b3966}body:has(dialog[open]){overflow:hidden}.dialog-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;color:var(--muted);font-size:11px}.dialog-top>span{display:flex;gap:9px;align-items:center}.dialog-top>span>.icon{width:17px;height:17px;color:var(--accent)}dialog h2{font-family:Georgia,serif;font-size:32px;font-weight:400;letter-spacing:-.5px;line-height:1.2;margin-bottom:15px}dialog>p{font-size:13px;color:var(--muted);margin-bottom:18px}dialog h3{font-size:14px;font-weight:600;margin:23px 0 7px}.shortcuts{margin:22px 0;font-size:11px}.shortcuts>div{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:10px 0;gap:15px}.shortcuts dd{margin:0;color:var(--muted)}kbd{font-family:inherit;border:1px solid #d9ded4;background:#f1f2ec;border-radius:4px;padding:3px 5px;font-size:10px;white-space:nowrap}.fine-print{font-size:11px!important;color:#606c66!important;line-height:1.75!important}.puzzle-choices{display:flex;flex-direction:column;margin:22px 0;gap:8px}.puzzle-choices label{display:flex;align-items:center;gap:12px;padding:15px;border:1px solid var(--line);border-radius:8px;cursor:pointer}.puzzle-choices label:has(input:checked){border-color:var(--accent);background:var(--lavender)}.puzzle-choices label>span{display:flex;flex-direction:column;gap:6px}.puzzle-choices label strong{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600}.puzzle-choices label strong small{font-size:9px;font-weight:400;color:var(--muted)}.puzzle-choices label>span>span{font-size:11px;color:var(--muted)}.puzzle-choices label>.icon{width:18px;height:18px;color:#6e8b73;margin-left:auto}.puzzle-choices input{width:16px;height:16px;margin:0;flex-shrink:0}#new-form>.button{margin-top:18px}.restart-button{display:flex;margin:15px auto 0;color:var(--muted)}.library-dialog{width:610px}.lesson-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:23px 0}.lesson-tabs button{flex:1;padding:12px 5px;border-bottom:2px solid transparent;font-size:12px;color:var(--muted);margin-bottom:-1px}.lesson-tabs button[aria-selected=true]{border-color:var(--accent);color:var(--accent);font-weight:600}.lesson-tabs button:hover{background:#eeedf5}#lesson-content h3{font-family:Georgia,serif;font-size:25px;font-weight:400;margin:19px 0 12px}#lesson-content>p{font-size:13px;line-height:1.85;color:var(--muted)}.lesson-example{display:flex;gap:23px;align-items:center;margin:25px 0;padding:23px;background:#eeedf5;border-radius:10px}.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);width:117px;height:117px;flex-shrink:0;background:#d4cede;gap:1px;border:1px solid #bcb4d0;border-radius:3px;overflow:hidden}.lesson-grid>span{display:flex;justify-content:center;align-items:center;background:#fbfafc;font-size:10px;color:#756d84}.lesson-grid>.lit{background:#dcd5f0;color:#504788;font-weight:600}.lesson-example h4{font-size:12px;margin-bottom:8px}.lesson-example p{font-size:11px;color:#6b637e;line-height:1.8}.lesson-takeaway{display:flex;align-items:flex-start;gap:12px;margin-bottom:20px}.lesson-takeaway>.icon{width:20px;height:20px;color:var(--accent);margin-top:3px}.lesson-takeaway p{font-size:13px;line-height:1.8}#lesson-content>.button{margin-top:24px}@keyframes hint-reveal{0%{clip-path:inset(0 0 5% 0);filter:blur(1px)}to{clip-path:inset(0);filter:blur(0)}}@media(hover:hover){.cell:hover:not(.selected){background:#eae7f3}.number-pad button:active{background:#d5cfea}}@media(min-width:1440px){main{padding-top:52px}.intro{margin-bottom:48px}.site-header{height:104px}.workspace{gap:72px}.techniques{margin-top:58px}}@media(max-width:1000px){.site-header{padding:0 32px;gap:40px}.header-note{display:none}main{padding:34px 32px 0}.intro h1{font-size:32px}.workspace{gap:32px;grid-template-columns:minmax(0,1.25fr) minmax(0,.9fr)}.coach-panel{padding:22px;min-height:470px}.coach-panel h3{font-size:28px}.cell{font-size:25px}.candidates{font-size:8px;padding:2px}.technique-list{gap:18px}.technique-item{gap:9px}.technique-copy small{font-size:9px}.technique-item>.icon{display:none}.technique-diagram{width:40px;height:40px}.number-pad{gap:4px}.number-pad button{height:58px}.game-heading h2{font-size:14px}.game-heading>div:first-child{gap:8px}.board-options,.board-status{font-size:9px}}@media(max-width:760px){.site-header{height:80px;padding:0 24px;gap:24px;justify-content:space-between}.brand{font-size:23px}.brand-icon{width:31px;height:31px}.site-header nav{gap:20px;font-size:12px}.desktop-only{display:none}main{max-width:590px;padding:29px 24px 0}.intro{margin-bottom:33px;align-items:flex-start;gap:10px}.intro h1{font-size:30px;max-width:330px;line-height:1.2}.intro h1 em{display:block;margin-top:2px}.intro p{font-size:12px;max-width:230px;margin-top:11px}.new-game{padding:10px 11px;min-height:40px;margin-top:6px;font-size:11px;gap:5px}.new-game .icon{width:15px}.workspace{grid-template-columns:1fr;gap:29px}.game-heading{margin-bottom:27px}.game-heading h2{font-size:16px}.timer-wrap{font-size:12px}.cell{font-size:27px}.candidates{font-size:10px;padding:4px}.board-status{font-size:10px}.number-pad{gap:5px}.number-pad button{height:60px}.tools button{font-size:12px}.board-options{font-size:10px}.coach-panel{min-height:0;padding:23px 25px}.coach-heading{margin-bottom:18px}.coach-panel h3{font-size:29px}.coach-panel h3 br{display:none}.coach-panel p{font-size:12px}.coach-art{height:145px}.art-grid{width:93px;height:93px}.art-grid>span{font-size:15px}.art-grid .art-focus{font-size:22px}.aha-spark{left:calc(50% + 50px);top:18px}.art-caption{bottom:7px}.coach-panel .button{margin-top:8px}.coach-footnote{padding:20px 0 12px}.shortcut-link{display:none}.techniques{margin-top:25px;padding-top:28px;padding-bottom:30px}.section-heading{align-items:flex-start;flex-direction:column;gap:8px}.section-heading h2{font-size:22px;max-width:300px}.section-heading p{margin-top:7px}.section-heading .text-button{font-size:11px}.technique-list{grid-template-columns:1fr 1fr;gap:23px 26px;margin-top:25px}.technique-diagram{width:44px;height:44px}.technique-copy strong{font-size:12px}.technique-copy small{font-size:10px}.technique-item>.icon{display:block;width:12px}.technique-item{gap:12px}footer{max-width:542px;margin:0 auto;padding:21px 0 25px;flex-direction:column;gap:10px;font-size:10px}footer>span:last-child{font-size:10px}.board-frame,.tools,.number-pad,.board-options{margin-left:13px}.coach-footnote p{font-size:11px}.hint-content h3{font-size:29px}.hint-explanation>p{font-size:13px}.why p{font-size:12px}.coach-complete>.icon{margin-top:12px}.completion-count{margin:16px 0}}@media(max-width:420px){.site-header{padding:0 19px;height:73px;gap:14px}.brand{font-size:21px;gap:8px}.brand-icon{width:29px;height:29px}.site-header nav{gap:15px;font-size:11px}main{padding:26px 19px 0}.intro h1{font-size:28px}.intro p{font-size:11px;max-width:205px}.new-game{font-size:10px;padding:9px 8px;gap:3px;min-height:37px}.intro{margin-bottom:30px}.new-game .icon{width:13px;height:13px}.game-heading h2{font-size:14px}.difficulty{font-size:10px;padding:4px 7px}.game-heading>div:first-child{gap:8px}.timer-wrap{gap:4px;font-size:11px}.timer-wrap>.icon{width:13px}.timer-wrap .icon-button{width:24px}.cell{font-size:23px}.candidates{font-size:8px;padding:2px}.board-status{font-size:9px;padding-top:11px}.progress-track{width:30px}.tools{gap:1px;padding:6px 0}.tools button{font-size:11px;gap:5px}.tools .icon{width:17px}.tools small{font-size:7px}.number-pad{gap:4px;margin-top:13px}.number-pad button{height:55px;border-radius:6px}.number-pad button>span{font-size:23px}.board-options{margin-top:12px;font-size:9px}.coach-panel{padding:23px}.technique-list{gap:21px 18px}.technique-item{gap:9px}.technique-copy small{font-size:9px}.technique-diagram{width:40px;height:40px}.technique-copy strong{font-size:11px}footer{margin:0 19px}.toast{bottom:16px;font-size:12px;padding:12px 16px}dialog{padding:23px;max-height:calc(100dvh - 28px)}dialog h2{font-size:29px}.lesson-example{gap:15px;padding:16px}.lesson-grid{width:90px;height:90px}.lesson-grid>span{font-size:8px}.lesson-example p{font-size:10px}.puzzle-choices label{padding:13px;gap:9px}.puzzle-choices label strong{font-size:12px}.puzzle-choices label>span>span{font-size:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}.desktop-only{margin-left:.25em}.view-board{display:none}@media(max-width:760px){.view-board{display:flex;margin-top:12px;font-size:11px}}@media(min-width:1001px)and (max-height:960px){.site-header{height:80px}main{max-width:1000px;padding-top:28px}.intro{margin-bottom:28px}.intro h1{font-size:32px}.workspace{grid-template-columns:minmax(0,clamp(380px,calc(100dvh - 465px),480px)) minmax(0,354px);gap:48px}.number-pad{margin-top:12px}.number-pad button{height:54px}.board-options{margin-top:12px}}.coach-title-line{display:block}@media(max-width:760px){.coach-title-line{display:inline}}