:root{--sw-display: "Barlow Condensed", Arial, sans-serif;--sw-body: "Merriweather", Georgia, serif;--sw-steel: #1E2530;--sw-spark: #1A5C82;--sw-purple: #9447D6;--sw-teal: #1FA8AE;--sw-ember: #D4501A;--sw-blue: #2A85C2;--sw-red: #CF2C38;--sw-yellow: #F5C400;--sw-bone: #F2EFE8;--sw-white: #FFFFFF;--sw-text-on-dark: rgba(255,255,255,.85);--sw-text-on-dark-full: #FFFFFF;--sw-text-on-dark-muted: rgba(255,255,255,.6);--sw-radius-md: 8px;--sw-radius-sm: 5px}.ts-display{font-family:var(--sw-display);font-size:4.25rem;font-weight:800;line-height:1;letter-spacing:-1px;color:var(--sw-steel)}.ts-h1{font-family:var(--sw-display);font-size:2.25rem;font-weight:800;line-height:1.1;letter-spacing:-.5px;color:var(--sw-steel)}.ts-h2{font-family:var(--sw-display);font-size:1.375rem;font-weight:700;line-height:1.2;color:var(--sw-steel)}.ts-eyebrow{font-family:var(--sw-display);font-size:1.1875rem;font-weight:700;line-height:1.4;letter-spacing:2.5px;text-transform:uppercase;color:var(--sw-ember)}.ts-body{font-family:var(--sw-body);font-size:.9375rem;font-weight:400;line-height:1.7;color:var(--sw-steel)}.ts-lead{font-family:var(--sw-body);font-size:1.0625rem;font-weight:400;line-height:1.5;color:var(--sw-steel)}.ts-quote{font-family:var(--sw-body);font-size:1.0625rem;font-weight:400;line-height:1.5;font-style:italic;color:var(--sw-steel)}.ts-label{font-family:var(--sw-display);font-size:1.1875rem;font-weight:700;line-height:1.3;letter-spacing:1.5px;text-transform:uppercase;color:var(--sw-steel)}.ts-caption{font-family:var(--sw-body);font-size:.75rem;font-weight:400;line-height:1.5;color:#888}*{box-sizing:border-box;margin:0;padding:0}html{font-size:16px}body{font-family:var(--sw-body);color:var(--sw-steel);background:var(--sw-white);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}a{color:inherit}button{font-family:inherit;cursor:pointer}img{max-width:100%;display:block}input,select,textarea{font-family:inherit}.text-on-dark{color:var(--sw-text-on-dark)!important}.text-on-dark-full{color:var(--sw-text-on-dark-full)!important}.text-on-dark-muted{color:var(--sw-text-on-dark-muted)!important}.sw-hero{background:var(--sw-spark);padding:56px 40px 48px;color:var(--sw-text-on-dark)}.sw-hero-mark{font-family:var(--sw-display);font-size:1.375rem;font-weight:800;letter-spacing:4px;line-height:1}.sw-hero-mark .a{color:var(--sw-text-on-dark-full)}.sw-hero-mark .b{color:var(--sw-ember)}a.sw-mark-link{text-decoration:none;display:inline-block;transition:opacity .15s}a.sw-mark-link:hover{opacity:.85}a.sw-mark-link:focus-visible{outline:2px solid var(--sw-text-on-dark-full);outline-offset:4px;border-radius:3px}.sw-foot{background:var(--sw-spark);padding:18px 40px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}.sw-foot-mark{font-family:var(--sw-display);font-size:14px;font-weight:800;letter-spacing:3px}.sw-foot-mark .a{color:var(--sw-text-on-dark-full)}.sw-foot-mark .b{color:var(--sw-ember)}.sw-foot-tag{font-family:var(--sw-body);font-style:italic;font-size:12px;color:var(--sw-text-on-dark-muted)}.sw-step{background:var(--sw-white);border:1px solid var(--sw-bone);border-radius:var(--sw-radius-md);padding:24px 28px;margin-bottom:18px}.sw-step-active{border:2px solid var(--sw-ember);padding:23px 27px}.sw-step-done{opacity:.5}.sw-step-done .sw-step-num{background:var(--sw-teal)}.sw-step-head{display:flex;align-items:center;gap:14px;margin-bottom:8px}.sw-step-num{width:36px;height:36px;border-radius:50%;background:var(--sw-steel);color:var(--sw-white);display:flex;align-items:center;justify-content:center;font-family:var(--sw-display);font-weight:800;font-size:18px;flex-shrink:0}.sw-step-body{margin-left:50px}.sw-callout{background:var(--sw-bone);border-left:3px solid var(--sw-teal);padding:16px 20px;margin:18px 0;border-radius:0 var(--sw-radius-sm) var(--sw-radius-sm) 0}.sw-callout-purple{border-left-color:var(--sw-purple)}.sw-callout-teal{border-left-color:var(--sw-teal)}.sw-callout-ember{border-left-color:var(--sw-ember)}.sw-callout-blue{border-left-color:var(--sw-blue)}.sw-callout-red{border-left-color:var(--sw-red)}.sw-btn{display:inline-block;font-family:var(--sw-display);font-size:.9375rem;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;padding:14px 28px;border-radius:var(--sw-radius-sm);border:1.5px solid var(--sw-steel);background:transparent;color:var(--sw-steel);text-decoration:none;cursor:pointer;transition:all .15s}.sw-btn:hover{background:var(--sw-bone)}.sw-btn:disabled{opacity:.4;cursor:not-allowed}.sw-btn:disabled:hover{background:transparent}.sw-btn-primary{background:var(--sw-ember);border-color:var(--sw-ember);color:var(--sw-white)}.sw-btn-primary:hover{background:#b0401a;border-color:#b0401a}.sw-btn-primary:disabled:hover{background:var(--sw-ember);border-color:var(--sw-ember)}.sw-btn-success{background:var(--sw-teal);border-color:var(--sw-teal);color:var(--sw-white)}.sw-btn-success:hover{background:#178b91;border-color:#178b91}.sw-btn-on-dark{border-color:var(--sw-text-on-dark);color:var(--sw-text-on-dark-full)}.sw-btn-on-dark:hover{background:#ffffff1a}.sw-btn-subtle{border:none;padding:8px 0;letter-spacing:1px}.sw-btn-subtle:hover{background:transparent;text-decoration:underline}.sw-page{max-width:1100px;margin:0 auto}.sw-body{padding:56px 40px}.sw-section+.sw-section{margin-top:56px}.sw-card{background:var(--sw-white);border:1px solid var(--sw-bone);border-radius:var(--sw-radius-md);padding:28px 32px}.sw-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.sw-grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.sw-input,.sw-textarea,.sw-select{font-family:var(--sw-body);font-size:1rem;width:100%;padding:12px 14px;border:1px solid #d8d4ca;border-radius:var(--sw-radius-sm);background:var(--sw-white);color:var(--sw-steel);transition:border-color .15s}.sw-input:focus,.sw-textarea:focus,.sw-select:focus{outline:none;border-color:var(--sw-ember)}.sw-textarea{resize:vertical;min-height:88px}.sw-field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.sw-field label{font-family:var(--sw-display);font-size:.8125rem;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;color:var(--sw-steel)}@media (max-width: 760px){.sw-grid-3,.sw-grid-2{grid-template-columns:1fr}.sw-body{padding:36px 22px}.sw-hero{padding:40px 22px 36px}.sw-foot{padding:18px 22px}}.home{text-align:center}.home__eyebrow{margin-bottom:14px;color:var(--sw-purple)}.home__title{margin-bottom:12px}.home__sub{margin-bottom:28px}.home__how{text-align:left;max-width:600px;margin:0 auto 32px}.home__pick-label{margin-bottom:6px}.home__cta-row{margin-top:18px}.play-header{display:flex;align-items:center;justify-content:space-between;padding:14px 22px;background:var(--sw-spark);color:var(--sw-text-on-dark)}.play-header__brand{font-size:1.05rem;letter-spacing:3px}.play-header #move-counter-slot{flex:1;display:flex;justify-content:center}.play-header .sw-btn{color:var(--sw-text-on-dark-full);border-color:transparent;font-size:.8rem}.play-header .sw-btn:hover{background:#ffffff14}.play-main{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;max-width:1100px;margin:0 auto;padding:32px 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var(--sw-steel);border-radius:var(--sw-radius-sm);overflow:hidden;background:var(--sw-white)}.board-trail{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:1}.board-ranks{grid-column:1;grid-row:1;display:grid;grid-template-rows:repeat(var(--size),1fr);align-items:center;justify-items:center}.board-files{grid-column:2;grid-row:2;display:grid;grid-template-columns:repeat(var(--size),1fr);align-items:center;justify-items:center}.board-rank,.board-file{font-family:var(--sw-display);font-weight:700;font-size:.875rem;color:var(--sw-steel);opacity:.55}.board-sq{position:relative;border:none;margin:0;padding:0;cursor:pointer;display:flex;align-items:center;justify-content:center;font-family:var(--sw-display);outline:none;transition:background .12s,box-shadow .12s}.board-sq--light{background:var(--sw-white)}.board-sq--dark{background:var(--sw-bone)}.board-sq:hover:not(:disabled){box-shadow:inset 0 0 0 2px var(--sw-purple);z-index:2}.board-sq:focus-visible{box-shadow:inset 0 0 0 3px var(--sw-ember);z-index:3}.board-sq--visited{background:color-mix(in srgb,var(--sw-purple) 15%,var(--sw-white))}.board-sq--visited.board-sq--dark{background:color-mix(in srgb,var(--sw-purple) 18%,var(--sw-bone))}.board-sq--current{background:color-mix(in srgb,var(--sw-purple) 22%,var(--sw-white))}.board-sq--legal:after{content:"";position:absolute;width:28%;height:28%;border-radius:50%;background:var(--sw-purple);opacity:.35;pointer-events:none}.board-sq--hint{animation:hint-pulse 1.2s ease-in-out 3}@keyframes hint-pulse{0%,to{box-shadow:inset 0 0 0 2px transparent}50%{box-shadow:inset 0 0 0 4px var(--sw-ember)}}.board-sq--shake{animation:square-shake .32s ease-in-out}@keyframes 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rgba(30,37,48,.25))}.knight-svg{width:100%;height:100%}.move-counter{display:inline-flex;align-items:baseline;gap:8px;padding:6px 14px;border:1px solid var(--sw-bone);border-radius:999px;background:var(--sw-white)}.move-counter__label{font-size:.75rem;letter-spacing:1.2px;color:var(--sw-steel);opacity:.7}.move-counter__num{font-family:var(--sw-display);font-size:1.125rem;font-weight:700;color:var(--sw-steel)}.move-counter__num strong{color:var(--sw-purple);font-weight:800}.size-picker{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0 28px}.size-picker__card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:16px 10px 14px;background:var(--sw-white);border:1.5px solid var(--sw-bone);border-radius:var(--sw-radius-md);cursor:pointer;transition:border-color .15s,transform .15s;font-family:var(--sw-display)}.size-picker__card:hover{border-color:var(--sw-purple);transform:translateY(-1px)}.size-picker__card--selected{border-color:var(--sw-purple);border-width:2.5px;padding:14.5px 8.5px 12.5px;background:color-mix(in srgb,var(--sw-purple) 6%,var(--sw-white))}.size-picker__mini{width:56px;height:56px;border:1px solid var(--sw-steel)}.size-picker__dim{font-weight:800;font-size:1.1rem;color:var(--sw-steel);letter-spacing:.5px}.size-picker__diff{font-weight:700;font-size:.9rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--sw-purple)}.size-picker__sq{font-family:var(--sw-body);font-size:.75rem;color:var(--sw-steel);opacity:.6}@media (max-width: 600px){.size-picker{grid-template-columns:repeat(2,1fr)}.size-picker__mini{width:48px;height:48px}}.hint-controls .hint-tiers{display:flex;flex-direction:column;gap:4px;margin:6px 0}.hint-tier{display:flex;align-items:center;gap:8px;padding:4px 0;cursor:pointer;font-family:var(--sw-body)}.hint-tier input[type=radio]{accent-color:var(--sw-purple);width:16px;height:16px;cursor:pointer}.hint-tier__label{font-size:.875rem;color:var(--sw-steel)}.hint-controls__help{margin:6px 0 12px;font-style:italic}.hint-controls__btn-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.hint-controls__btn-row .sw-btn{padding:8px 16px;font-size:.75rem}.hint-pips{display:inline-flex;gap:5px;align-items:center}.hint-pip{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--sw-purple)}.hint-pip--used{background:transparent;border:1px solid var(--sw-purple);opacity:.4}.tip-card__head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:6px}.tip-card__shuffle{background:transparent;border:1px solid var(--sw-purple);border-radius:999px;width:24px;height:24px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--sw-purple);font-size:14px;font-weight:800;line-height:1}.tip-card__shuffle:hover{background:var(--sw-purple);color:var(--sw-white)}.tip-card__body{margin:0}.fact-deck__head{width:100%;display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:8px;background:transparent;border:none;padding:0;cursor:pointer;text-align:left}.fact-deck__index{font-family:var(--sw-body);font-size:.7rem;color:var(--sw-steel);opacity:.55}.fact-deck__caret{font-family:var(--sw-display);font-size:14px;color:var(--sw-purple);width:18px;text-align:center}.fact-deck__body{margin-top:12px}.fact-deck__body[hidden]{display:none}.fact-deck__title{margin-bottom:4px;color:var(--sw-purple)}.stuck-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#1e25308c;display:flex;align-items:center;justify-content:center;z-index:50;padding:22px;animation:stuck-fade-in .18s ease-out}@keyframes stuck-fade-in{0%{opacity:0}to{opacity:1}}.stuck-overlay__card{max-width:460px;text-align:center;animation:stuck-pop .22s cubic-bezier(.2,1.4,.3,1)}@keyframes stuck-pop{0%{transform:translateY(8px) scale(.96);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.stuck-overlay__body{margin:10px 0 18px;color:var(--sw-steel)}.stuck-overlay__actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.done__title,.done__sub{animation:done-rise .55s cubic-bezier(.2,1.2,.3,1) both}.done__sub{animation-delay:.1s}@keyframes done-rise{0%{transform:translateY(14px);opacity:0}to{transform:translateY(0);opacity:1}}.done__board .board-trail polyline{stroke-dasharray:var(--len, 600);stroke-dashoffset:var(--len, 600);animation:trail-draw 1.4s ease-out .25s forwards}@keyframes trail-draw{to{stroke-dashoffset:0}}.done__stats{animation:done-rise .5s ease-out 1.4s both}.done-rail{animation:done-rise .5s ease-out 1s both}.done__header-eyebrow{animation:badge-glow 1.6s ease-in-out infinite alternate}@keyframes badge-glow{0%{text-shadow:none}to{text-shadow:0 0 10px color-mix(in srgb,var(--sw-yellow) 60%,transparent)}}.done-main:before,.done-main:after{content:"";position:fixed;top:-10px;width:10px;height:10px;border-radius:2px;pointer-events:none;animation:confetti-fall 2.4s linear .2s 1}.done-main:before{left:25%;background:var(--sw-purple);animation-delay:.15s}.done-main:after{left:70%;background:var(--sw-ember);animation-delay:.45s}@keyframes confetti-fall{0%{transform:translateY(-20px) rotate(0);opacity:1}to{transform:translateY(105vh) rotate(540deg);opacity:.2}}