:root{color-scheme:dark;--paper: #181f1d;--ink: #e1e8df;--muted: #adb9ad;--accent: #e49a79;--line: #46564d;--header: #202923;--surface: #242e29;--hover: #344238;--strong: #b7d0aa;--on-strong: #18231a;--result: #2f473b;--on-result: #edf2e7;--result-muted: #c9d8c6;--track: #3b4b41;--track-border: #81917f;--tick: #9dab94;--error: #ffad97;--option-selected: #344a3c;--option-border: #829d76;--table-header: #242e29;--table-stripe: #202923;--table-hover: #344a3c;--board-frame: #344038;--board-dark: #344b3d;--board-light: #64725c;--board-piece: #e1e8df;--board-shadow: #18241c;font-family:Segoe UI,system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}:root[data-theme=light]{color-scheme:light;--paper: #f8f6f0;--ink: #233a31;--muted: #606b61;--accent: #a94f36;--line: #dcded2;--header: #f0efe6;--surface: #fffdf8;--hover: #e4e7dc;--strong: #233a31;--on-strong: #f8f6f0;--result: #233a31;--on-result: #f8f6f0;--result-muted: #d8dfd4;--track: #e5e7df;--track-border: #a7afa6;--tick: #899486;--error: #a23e2a;--option-selected: #e5eadf;--option-border: #9aaa93;--table-header: #efeee5;--table-stripe: #f1f2e9;--table-hover: #d1ddc5;--board-frame: #e9e5d8;--board-dark: #8b9e83;--board-light: #dedfca;--board-piece: #233a31;--board-shadow: #f8f6f0}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;grid-template-columns:250px minmax(0,1fr);grid-template-rows:1fr auto}a{color:inherit}a:focus-visible{outline:3px solid var(--accent);outline-offset:5px}main,.site-footer{grid-column:2;width:min(1120px,calc(100% - 64px));min-width:0;margin-inline:auto}main{grid-row:1;scroll-margin-top:20px}.site-footer{grid-row:2}.site-header{grid-column:1;grid-row:1 / 3;position:sticky;top:0;align-self:start;height:100vh;height:100dvh;display:flex;flex-direction:column;gap:44px;padding:28px 20px;border-right:1px solid var(--line);background:var(--header);z-index:10}.brand{display:flex;align-items:center;gap:12px;font-weight:750;font-size:26px;letter-spacing:-1px;text-decoration:none}.brand-mark{font-size:34px}.brand-dot{color:var(--accent)}.navigation-content{flex:1;min-height:0;display:flex;flex-direction:column;gap:24px;overflow-y:auto;padding:6px;margin:-6px}.navigation-heading{color:var(--muted);font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;margin:0 0 14px 12px}.navigation-items{list-style:none;padding:0;margin:0;display:grid;gap:6px}.navigation-link{display:flex;align-items:center;gap:12px;min-height:44px;padding:11px 12px;border-radius:5px;font-size:14px;text-decoration:none}.navigation-link:hover{background:var(--hover)}.navigation-link[aria-current=page]{background:var(--strong);color:var(--on-strong)}.navigation-icon{width:20px;height:20px;flex-shrink:0}.navigation-empty{margin:20px 12px;color:var(--muted);font-size:13px;line-height:1.65}.account-navigation{margin-top:auto;border-top:1px solid var(--line);padding-top:16px}.hero{min-height:500px;display:grid;grid-template-columns:1.3fr 1fr;align-items:center;gap:clamp(28px,4vw,70px);padding-block:70px}.eyebrow{color:var(--accent);font-size:11px;font-weight:750;letter-spacing:2px;margin:0 0 20px}h1{font-family:Georgia,Times New Roman,serif;font-size:clamp(38px,4.7vw,58px);line-height:1.14;font-weight:400;letter-spacing:-2px;margin:0 0 24px}.lede{font-size:17px;line-height:1.7;color:var(--muted);max-width:420px}.button{display:inline-flex;align-items:center;gap:26px;margin-top:20px;padding:15px 20px;background:var(--strong);color:var(--on-strong);border-radius:4px;text-decoration:none;font-size:14px}.board-art{width:100%;max-width:360px;aspect-ratio:1;display:grid;place-items:center;border:12px solid var(--board-frame);border-radius:6px;background:conic-gradient(var(--board-dark) 25%,var(--board-light) 0 50%,var(--board-dark) 0 75%,var(--board-light) 0) 0 0 / 25% 25%;box-shadow:12px 14px 0 var(--board-frame);transform:rotate(-5deg)}.board-knight{font-size:clamp(140px,17vw,220px);line-height:1;color:var(--board-piece);text-shadow:3px 4px 0 var(--board-shadow)}.coming-next{padding-block:42px 64px;border-top:1px solid var(--line)}h2{font-family:Georgia,Times New Roman,serif;font-size:32px;font-weight:400;margin:0 0 14px}.coming-next>p:not(.eyebrow){max-width:660px;font-size:15px;color:var(--muted);line-height:1.7}.tool-themes{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:38px}.tool-themes article{border-top:1px solid var(--line);padding-top:20px}.theme-number{color:var(--accent);font-size:12px}h3{font-size:17px;font-weight:600;margin:16px 0 10px}.tool-themes p{font-size:14px;color:var(--muted);line-height:1.6}.site-footer{border-top:1px solid var(--line);padding-block:16px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px 20px;font-size:12px;color:var(--muted)}.footer-links{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:4px 20px;margin-left:auto}.footer-links a{display:inline-flex;align-items:center;min-height:44px;text-underline-offset:3px}.footer-links a:hover,.footer-links a[aria-current=page]{color:var(--ink)}.legal-page{max-width:760px;margin-inline:auto;padding-block:52px 64px;font-size:15px;line-height:1.75;overflow-wrap:anywhere}.legal-page section{margin-block:32px}.legal-page [id]{scroll-margin-top:24px}.legal-navigation{display:flex;flex-wrap:wrap;gap:4px 24px;border-block:1px solid var(--line);padding-block:8px}.legal-navigation a{display:inline-flex;align-items:center;min-height:44px;text-underline-offset:3px}.legal-language{margin-left:auto}.legal-page>section+section{border-top:1px solid var(--line);padding-top:32px}.legal-page h2{font-size:28px;line-height:1.3}.legal-page h3{line-height:1.5}.legal-page p{margin-block:14px}.legal-page li+li{margin-top:8px}.legal-contact{font-style:normal}.legal-draft{padding:16px 20px;border:1px solid var(--accent);border-radius:5px;background:var(--surface)}.legal-missing{color:var(--muted)}.skip-link{position:fixed;top:-100px;left:20px;padding:12px;background:var(--strong);color:var(--on-strong);z-index:20}.skip-link:focus{top:10px}.elo-tool,.dwz-tool{max-width:800px;margin-inline:auto;padding-block:52px 64px}.dwz-tool{max-width:640px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}.tool-heading{margin-bottom:32px}.tool-heading h1{margin-bottom:14px}.rating-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.rating-cards--pair{grid-template-columns:repeat(2,minmax(0,1fr))}.rating-card{display:flex;flex-direction:column;min-width:0;padding:24px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.rating-card label{display:block;margin-bottom:20px;font-size:14px;font-weight:600}.rating-card input[type=number],.rating-card output{display:block;width:100%;min-width:0;font-family:inherit;font-size:clamp(30px,3.3vw,42px);font-weight:650;font-variant-numeric:tabular-nums;line-height:1.25;letter-spacing:-1.5px}.rating-card input[type=number]{padding:4px 0;border:0;border-bottom:2px solid var(--line);border-radius:0;color:var(--ink);background:transparent}.rating-card input[type=number]{appearance:textfield;-moz-appearance:textfield}.rating-card input[type=number]::-webkit-inner-spin-button,.rating-card input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.rating-card input[type=number]:focus-visible,.rating-slider-widget:focus-visible{outline:2px solid var(--accent);outline-offset:5px}.rating-card input[aria-invalid=true]{border-bottom-color:var(--accent)}.rating-slider-control{--slider-thumb-size: 16px;margin-top:auto;padding-top:20px}.rating-slider-widget{position:relative}.rating-slider{appearance:none;display:block;width:100%;height:24px;margin:0;padding:0;border:0;background:transparent;cursor:pointer}.rating-slider::-webkit-slider-runnable-track{box-sizing:border-box;height:6px;border:0;border-radius:3px;box-shadow:inset 0 0 0 1px var(--track-border);background:linear-gradient(to right,var(--strong) var(--slider-progress, 0%),var(--track) var(--slider-progress, 0%))}.rating-slider::-webkit-slider-thumb{appearance:none;box-sizing:border-box;width:var(--slider-thumb-size);height:var(--slider-thumb-size);margin-top:-5px;border:0;border-radius:50%;background:var(--strong)}.rating-slider::-moz-range-track{box-sizing:border-box;height:6px;border:0;border-radius:3px;box-shadow:inset 0 0 0 1px var(--track-border);background:linear-gradient(to right,var(--strong) var(--slider-progress, 0%),var(--track) var(--slider-progress, 0%))}.rating-slider::-moz-range-thumb{box-sizing:border-box;width:var(--slider-thumb-size);height:var(--slider-thumb-size);border:0;border-radius:50%;background:var(--strong)}.rating-slider::-moz-range-progress{background:transparent}.slider-ticks,.slider-bounds{margin-inline:calc(var(--slider-thumb-size) / 2)}.slider-ticks{position:absolute;top:18px;left:0;right:0;height:6px;pointer-events:none}.slider-tick{position:absolute;width:1px;height:4px;background:var(--tick);transform:translate(-50%)}.slider-tick--anchor{height:6px;background:var(--muted)}.slider-bounds{position:relative;height:14px;margin-top:4px;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.slider-bounds span{position:absolute;transform:translate(-50%)}.slider-bounds span:first-child{left:0}.slider-bounds span:last-child{left:100%}.slider-quarter{left:25%}.slider-three-quarter{left:75%}.result-card{background:var(--result);color:var(--on-result);border-color:var(--result)}.result-card output{padding-block:4px}.rating-difference{margin:14px 0 0;font-size:12px;color:var(--result-muted)}.field-error{color:var(--error);font-size:12px;line-height:1.5;margin:12px 0 0}.field-error:empty{display:none}.score-explanation{color:var(--muted);font-size:13px;line-height:1.65;margin:20px 0 0}.elo-lookup{margin-top:48px;padding-top:32px;border-top:1px solid var(--line)}.lookup-heading{display:flex;align-items:start;justify-content:space-between;flex-wrap:wrap;gap:20px;margin-bottom:24px}.lookup-heading h2{font-size:28px}.lookup-heading p{color:var(--muted);font-size:13px;line-height:1.6;margin:0}.interval-switch{border:0;padding:0;margin:0;min-width:0}.interval-switch legend{color:var(--muted);font-size:12px;margin-bottom:10px}.interval-options{display:flex;flex-wrap:wrap;gap:8px}.interval-options label{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:5px;padding:10px 12px;font-size:13px;cursor:pointer;background:var(--surface)}.interval-options label:has(input:checked){background:var(--option-selected);border-color:var(--option-border)}.interval-options input{accent-color:var(--strong);margin:0}.lookup-tables{display:grid;grid-template-columns:repeat(2,minmax(0,256px));justify-content:center;align-items:start;gap:24px}.elo-table{width:100%;table-layout:fixed;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}.elo-table caption{text-align:left;color:var(--muted);font-size:12px;padding-bottom:14px;line-height:1.6}.elo-table th,.elo-table td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left}.elo-table th{color:var(--muted);font-size:12px;font-weight:600;background:var(--table-header)}.elo-table th:first-child,.elo-table td:first-child{text-align:right}.elo-table tr:nth-child(2n){background:var(--table-stripe)}.elo-table tbody tr:hover{background:var(--table-hover)}.table-note{font-size:12px;line-height:1.65;color:var(--muted);margin:18px 0 0}.header-heading{display:flex;flex-direction:column;gap:20px}.theme-control{display:flex;flex-shrink:0;align-items:center;justify-content:space-between;gap:10px;padding-top:16px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.theme-control[hidden]{display:none}.theme-control select{min-height:44px;padding:8px 10px;border:1px solid var(--line);border-radius:5px;font:inherit;color:var(--ink);background:var(--surface);cursor:pointer}.theme-control select:focus-visible{outline:2px solid var(--accent);outline-offset:3px}@media(max-width:960px){.header-heading{flex-direction:row;align-items:center;justify-content:space-between;gap:12px}body{display:block}main,.site-footer{width:calc(100% - 40px)}main,[id],.legal-page [id]{scroll-margin-top:150px}.site-header{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;height:auto;gap:12px;padding:14px 20px 12px;border-right:0;border-bottom:1px solid var(--line)}.header-heading{grid-column:1;grid-row:1}.theme-control{grid-column:2;grid-row:1;padding:0;border:0}.brand{font-size:22px}.brand-mark{font-size:28px}.navigation-content{grid-column:1 / -1;grid-row:2;flex:none;flex-direction:row;overflow-x:auto;overflow-y:hidden;gap:12px;padding:6px;margin:-6px}.tool-navigation{min-width:0;flex-shrink:0}.navigation-heading,.navigation-empty{display:none}.navigation-items{display:flex}.navigation-link{white-space:nowrap}.account-navigation{margin:0;border:0;padding:0;flex-shrink:0}.hero{grid-template-columns:1fr;gap:48px;padding-block:50px}.board-art{width:70%;max-width:270px;margin-inline:auto}.tool-themes{grid-template-columns:1fr;gap:20px}}@media(max-width:600px){.elo-tool,.dwz-tool,.legal-page{padding-block:32px 44px}.rating-cards{grid-template-columns:1fr;gap:12px}.rating-card{padding:20px}.rating-card label{margin-bottom:10px}.rating-card input[type=number],.rating-card output{font-size:42px}.lookup-tables{grid-template-columns:minmax(0,256px);gap:24px}.elo-lookup{margin-top:36px}.elo-table th,.elo-table td{padding:11px 12px}}@media(max-width:360px){.theme-control>span{display:none}}.position-tool{padding-block:54px 64px}.position-layout{display:grid;grid-template-columns:minmax(0,360px) minmax(0,600px);gap:40px;align-items:start}.position-form{display:grid;gap:12px}.position-form label{font-size:15px;font-weight:600}.position-form textarea,.position-form select{width:100%;min-width:0;min-height:44px;padding:12px;border:1px solid var(--line);border-radius:5px;color:var(--ink);background:var(--surface);font:inherit}.position-form textarea{resize:vertical;line-height:1.6;overflow-wrap:anywhere}.position-form textarea:focus-visible,.position-form select:focus-visible,.position-tool button:focus-visible,.position-fen summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.position-form .form-help{margin:0 0 12px}.form-help,.position-credit{color:var(--muted);font-size:13px;line-height:1.65}.position-credit{overflow-wrap:anywhere}.position-tool .button{margin-top:0;min-height:44px;border:0;cursor:pointer;font-family:inherit;justify-content:center}.position-tool .button:disabled{cursor:wait;opacity:.65}.position-preview{display:block;width:100%;max-width:720px;height:auto;border-radius:4px}.position-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:20px}.position-result h2{font-size:24px}.position-fen{font-size:13px;color:var(--muted)}.position-fen summary{min-height:44px;padding-block:12px;cursor:pointer}.position-fen code{display:block;padding:12px;background:var(--surface);overflow-wrap:anywhere;line-height:1.7}.position-empty{min-height:220px;display:grid;place-items:center;border:1px dashed var(--line);border-radius:5px;color:var(--muted);font-size:14px}.position-form .field-error:empty{display:none}.position-form .errorlist{list-style:none;margin:0;padding:0}@media(max-width:1100px){.position-layout{gap:24px;grid-template-columns:minmax(0,300px) minmax(0,1fr)}}@media(max-width:740px){.position-tool{padding-block:32px 44px}.position-layout{grid-template-columns:minmax(0,1fr)}.position-empty{display:none}}