:root{--ink:#172239;--muted:#667085;--line:#27344e;--paper:#fbfaf6;--card:#fff;--blue:#0b5cad;--amber:#d89b20;--amber-dark:#8a5d00;--wash:#edf4fb;--shadow:0 14px 40px rgba(23,34,57,.08)}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif}button,select{font:inherit;color:inherit}button:focus-visible,select:focus-visible{outline:3px solid #57a0e6;outline-offset:2px}.app-shell{max-width:1440px;margin:auto;padding:28px 34px 46px;min-height:100vh}
.masthead{display:grid;grid-template-columns:1fr auto auto;gap:28px;align-items:end;border-bottom:1px solid #d9d9d2;padding:0 4px 20px;margin-bottom:22px}.eyebrow,.section-label{font-size:12px;text-transform:uppercase;letter-spacing:.18em;font-weight:700;color:var(--amber-dark);margin:0 0 7px}.masthead h1{font-size:38px;letter-spacing:-.035em;margin:0;line-height:1}.masthead h1 span{color:var(--blue)}.tagline{margin:8px 0 0;color:var(--muted);font-size:16px}.puzzle-picker label{display:block;font-size:10px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.12em;margin-bottom:5px}.puzzle-picker select{min-width:190px;border:1px solid #cfd4dc;border-radius:9px;background:#fff;padding:9px 34px 9px 11px;font-weight:700}.progress{text-align:right;display:flex;align-items:flex-end;gap:9px}.progress strong{font-size:30px;line-height:.9}.progress small{font-size:15px;color:var(--muted)}.progress span{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.game-layout{display:grid;grid-template-columns:minmax(570px,1fr) minmax(340px,430px);gap:30px;align-items:start}.board-column,.side-panel>section{background:var(--card);border:1px solid #deded8;box-shadow:var(--shadow)}.board-column{border-radius:22px;padding:16px 20px 20px}.toolbar{display:flex;gap:9px;align-items:center;justify-content:flex-end}.toolbar button,.actions button{border:1px solid #ced3db;background:#fff;border-radius:9px;padding:8px 13px;cursor:pointer;font-weight:700;font-size:13px}.toolbar button:hover,.toolbar button.active{background:var(--ink);border-color:var(--ink);color:#fff}.mode-switch{display:flex;border-radius:10px;background:#eef0f4;padding:3px;margin-right:auto}.mode-switch button{border:0;background:transparent}.toolbar button:disabled{opacity:.35;cursor:not-allowed}.notes-key{font-size:11px;color:var(--muted);white-space:nowrap}
.board-wrap{display:flex;justify-content:center;min-height:510px}.board{width:min(100%,630px);height:auto;max-height:560px;touch-action:manipulation}.cell polygon{fill:#fbfcfe;stroke:var(--line);stroke-width:1.8;cursor:pointer;transition:fill .12s}.cell.in-region polygon{fill:#f2f7fc}.cell:hover polygon{fill:#e6f0fa}.cell.selected polygon{fill:#d8e9f8;stroke:var(--blue);stroke-width:3}.cell.fixed polygon{fill:#f8fbff}.cell-letter{text-anchor:middle;dominant-baseline:middle;font-size:25px;font-weight:700;fill:#18243b;pointer-events:none}.cell.fixed .cell-letter{fill:var(--blue)}.cell-notes{text-anchor:middle;dominant-baseline:middle;font-size:11px;font-weight:700;letter-spacing:.6px;fill:#8a650f;pointer-events:none}.centre{cursor:pointer}.centre>circle:first-child{fill:transparent;stroke:transparent;stroke-width:3}.centre.selected>circle:first-child{stroke:#76a8d6;fill:#dfeefa}.centre-core{fill:var(--line);stroke:#fff;stroke-width:1}.centre.boundary .centre-core{fill:var(--amber);stroke:var(--amber-dark)}
.letter-pad{display:grid;grid-template-columns:repeat(14,1fr);gap:5px;max-width:720px;margin:2px auto 13px}.letter-pad button{min-width:0;border:1px solid #d4d8df;background:#fff;border-radius:6px;padding:8px 2px;cursor:pointer;font-size:12px;font-weight:700}.letter-pad button:hover{background:var(--wash);border-color:#8db6da}.letter-pad button:disabled{opacity:.3;cursor:not-allowed}.letter-pad .erase{grid-column:span 2;background:#f4f2ec}.status{min-height:42px;border-radius:10px;background:#f1f4f7;padding:11px 14px;text-align:center;color:#445166;font-size:14px}.status.success{background:#e5f5e9;color:#145b2b;font-weight:700}.actions{display:flex;gap:9px;justify-content:center;margin-top:13px}.actions .check{background:var(--blue);color:#fff;border-color:var(--blue);padding-inline:24px}.actions .reset{font-weight:400}
.side-panel{display:grid;gap:15px}.side-panel>section{border-radius:18px;padding:20px 22px}.side-panel h2{font-size:20px;margin:0 0 8px}.side-panel h3{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin:18px 0 8px}.how-to p,.quiet{font-size:14px;line-height:1.55;color:#526074;margin:0}.legend{display:flex;gap:18px;margin-top:14px;font-size:12px;color:var(--muted)}.legend span{display:flex;align-items:center;gap:7px}.legend i{display:block;width:10px;height:10px;border-radius:50%}.six-dot{background:var(--line)}.four-dot{background:var(--amber);border:1px solid var(--amber-dark)}.region-card{border-top:4px solid #79a9d4!important}.shortlist{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}.shortlist button{border:1px solid #d2d7df;background:#fff;border-radius:999px;padding:6px 9px;cursor:pointer;font-size:11px;letter-spacing:.04em}.shortlist button.chosen{background:#fff3d6;border-color:var(--amber);color:#5e4308;font-weight:700}.bank-heading{display:flex;justify-content:space-between;align-items:flex-start}.bank-heading span{font-size:12px;color:var(--muted);background:#f1f3f5;padding:5px 8px;border-radius:99px}.word-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}.word-grid.six{grid-template-columns:repeat(2,1fr)}.word-grid button{border:0;background:#f4f5f6;border-radius:5px;padding:7px 5px;text-align:left;cursor:pointer;font-size:12px;letter-spacing:.05em}.word-grid button:hover{background:#e7eef5}.word-grid button.used{text-decoration:line-through;color:#9aa0aa;background:#fafafa}footer{display:flex;justify-content:space-between;align-items:center;margin-top:24px;padding:14px 4px;color:var(--muted);font-size:11px}footer button{border:0;background:none;color:var(--muted);text-decoration:underline;cursor:pointer}
.tester-identity{margin-top:13px;border-top:1px solid #e2e4e8;padding-top:9px;color:var(--muted);font-size:11px}.tester-identity summary{cursor:pointer;font-weight:700;color:#526074}.tester-identity summary span{font-weight:400}.tester-identity label{display:block;margin:9px 0 4px}.tester-identity input{width:100%;border:1px solid #cfd4dc;border-radius:7px;background:#fff;padding:7px 8px;font-size:12px}.tester-identity small{display:block;margin-top:5px;line-height:1.35}
@media(max-width:1050px){.masthead{grid-template-columns:1fr auto}.progress{display:none}.game-layout{grid-template-columns:1fr}.side-panel{grid-template-columns:1fr 1fr}.word-bank{grid-column:1/-1}.board-wrap{min-height:0}}@media(max-width:650px){.app-shell{padding:18px 12px 30px}.masthead{grid-template-columns:1fr;gap:16px;align-items:start}.masthead h1{font-size:30px}.tagline{font-size:14px}.puzzle-picker select{width:100%}.game-layout{gap:14px}.board-column{padding:12px 7px 16px;border-radius:14px}.toolbar{padding:0 5px}.toolbar button{padding:7px 9px}.notes-key{display:none}.board{width:100%;max-height:none}.letter-pad{grid-template-columns:repeat(9,1fr);padding:0 5px}.letter-pad .erase{grid-column:span 2}.side-panel{grid-template-columns:1fr}.word-bank{grid-column:auto}.side-panel>section{border-radius:14px}}
.mode-switch button:hover,.mode-switch button.active{background:var(--ink);color:#fff}

/* Navigation, puzzle identity and modal surfaces. */
.masthead{grid-template-columns:minmax(220px,1fr) auto auto auto;gap:clamp(12px,2vw,28px)}
.top-nav{display:flex;gap:5px;align-items:center}.top-nav button{border:0;background:transparent;border-radius:8px;padding:8px 10px;color:var(--muted);font-size:13px;font-weight:700;cursor:pointer}.top-nav button:hover,.top-nav .nav-primary{background:var(--ink);color:#fff}.puzzle-strip{display:flex;justify-content:space-between;align-items:center;flex:0 0 auto;border-bottom:1px solid #e2e4e8;padding:0 2px 8px;margin-bottom:5px}.puzzle-strip div{display:flex;align-items:center;gap:8px}.puzzle-strip span{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}.puzzle-strip strong{font-size:15px}.puzzle-strip em{font-style:normal;font-size:10px;font-weight:700;background:#edf4fb;color:var(--blue);border-radius:99px;padding:4px 7px}.puzzle-strip>span{font-weight:700}.actions .share{background:#fff;color:var(--blue);border-color:#8db6da}
.modal{width:min(92vw,560px);max-height:min(88vh,760px);overflow:auto;border:1px solid #d9dde4;border-radius:20px;background:#fff;color:var(--ink);padding:27px 29px;box-shadow:0 24px 80px rgba(23,34,57,.25)}.modal::backdrop{background:rgba(14,22,39,.54);backdrop-filter:blur(2px)}.modal h2{margin:0 0 13px;font-size:25px;line-height:1.15}.modal h3{margin:22px 0 10px}.modal p{color:#526074;line-height:1.55}.modal-close{position:absolute;right:13px;top:10px;border:0;background:transparent;font-size:28px;color:var(--muted);cursor:pointer}.wide-modal{width:min(94vw,880px)}.primary,.modal button.primary{border:1px solid var(--blue);border-radius:9px;background:var(--blue);color:#fff;padding:9px 15px;font-weight:700;cursor:pointer}.full-button{width:100%;margin-top:12px}.tutorial-step{display:none}.tutorial-step.active{display:block}.tutorial-example{display:flex;align-items:center;justify-content:center;gap:8px;margin:22px 0}.tutorial-example span{display:grid;place-items:center;width:42px;height:42px;background:#f2f7fc;border:1px solid var(--line);clip-path:polygon(50% 0,100% 100%,0 100%);font-weight:700;padding-top:12px}.tutorial-example b{margin-left:10px;color:var(--blue)}.boundary-demo{height:92px;display:flex;justify-content:center;align-items:center;gap:0}.boundary-demo i{display:block;width:54px;height:48px;background:#f7f9fc;border:2px solid var(--line);clip-path:polygon(0 0,100% 50%,0 100%)}.boundary-demo i:last-child{transform:rotate(180deg)}.boundary-demo strong{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--amber);color:#fff;z-index:1}.tutorial-promise{font-weight:700;color:var(--ink)!important;text-align:center}.tutorial-actions{display:flex;align-items:center;justify-content:space-between;margin-top:20px}.tutorial-actions button:not(.primary),.completion-actions button,.archive-filters button{border:1px solid #cfd4dc;border-radius:8px;background:#fff;padding:8px 12px;cursor:pointer}.tutorial-actions button:disabled{opacity:.35}.tutorial-actions span{color:var(--blue);letter-spacing:4px}.archive-filters{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:15px}.archive-filters button.active{background:var(--ink);color:#fff}.archive-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.archive-card{position:relative;border:1px solid #d7dce3;border-radius:12px;background:#fff;padding:13px;text-align:left;cursor:pointer}.archive-card:hover{border-color:#79a9d4;background:#f6faff}.archive-card.solved{background:#f0f8f2;border-color:#9ecaaa}.archive-card strong,.archive-card span{display:block}.archive-card strong{font-size:13px;margin:5px 0}.archive-card span{font-size:10px;color:var(--muted)}.archive-card i{position:absolute;right:9px;top:8px;color:#238347;font-style:normal}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.stat-grid div{background:#f3f5f7;border-radius:12px;padding:14px 7px;text-align:center}.stat-grid strong,.stat-grid span{display:block}.stat-grid strong{font-size:25px}.stat-grid span{font-size:10px;color:var(--muted);margin-top:5px}.badge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.badge{border:1px solid #d9dde4;border-radius:12px;padding:11px;opacity:.45}.badge.earned{opacity:1;background:#fff6de;border-color:#e1ad43}.badge strong,.badge span{display:block}.badge span{font-size:11px;color:var(--muted);margin-top:3px}.help-list{padding-left:22px;color:#526074}.help-list li{margin:9px 0;line-height:1.4}.modal form label{display:block;font-size:12px;font-weight:700;margin:12px 0}.modal select,.modal textarea{display:block;width:100%;margin-top:5px;border:1px solid #cfd4dc;border-radius:8px;background:#fff;padding:9px;font:inherit}.form-status{text-align:center;font-size:12px}.completion-modal{text-align:center}.completion-mark{font-size:42px;color:var(--amber);margin:0!important}.earned-badge{display:inline-block;background:#fff1c8;border:1px solid #e1ad43;border-radius:99px;padding:8px 13px;font-weight:700;margin:7px 0 17px}.completion-actions{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
@media(max-width:1050px){.masthead{grid-template-columns:minmax(180px,1fr) auto auto}.progress{display:none}.top-nav button{padding-inline:7px}.archive-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:700px){.masthead{grid-template-columns:1fr;gap:11px}.top-nav{order:3;width:100%;justify-content:space-between}.top-nav button{flex:1}.puzzle-picker{order:2}.puzzle-strip{padding-inline:5px}.archive-grid{grid-template-columns:repeat(2,1fr)}.stat-grid{grid-template-columns:repeat(2,1fr)}.modal{padding:24px 18px}.legend{flex-wrap:wrap}}
.help-links{display:flex;justify-content:center;gap:12px;margin-top:14px}.help-links button{border:0;background:transparent;color:var(--blue);text-decoration:underline;cursor:pointer}
.greybrow-link{display:block;margin-top:14px;padding-top:11px;border-top:1px solid #e2e4e8;color:var(--blue);font-size:12px;font-weight:700;text-align:center;text-decoration:none}.greybrow-link:hover{text-decoration:underline}.greybrow-link span{margin-left:3px}.share-cake{width:150px;margin:2px auto 12px}.share-cake svg{display:block;width:100%;height:auto}.completion-modal .earned-badge{display:block;width:max-content;max-width:100%;margin-inline:auto}
.brand-line{display:flex;align-items:center;gap:13px}.edition-switch{display:inline-flex;overflow:hidden;flex:0 0 auto;border:1px solid #cfd4dc;border-radius:8px;background:#fff;font-size:10px}.edition-switch a,.edition-switch strong{padding:6px 8px;text-decoration:none}.edition-switch strong{color:#fff;background:var(--ink)}.edition-switch a{color:var(--muted)}.three-dot{background:var(--amber);border:1px solid var(--amber-dark)}