:root{--paper: #f4efe3;--paper-raised: #ede6d2;--paper-card: #efe8d6;--paper-inset: #f7f1e1;--hairline: #d9cfb8;--hairline-strong: #c9bb9c;--hairline-strong-2: #b5a98d;--ink: #1c1710;--ink-2: #4a4130;--ink-2b: #6b6050;--ink-3: #8a7e6b;--ink-3b: #a79a80;--accent: #9e2b25;--accent-hover: #7c1f1a;--accent-dark: #c25048;--night: #1c1811;--night-raised: #211c13;--night-raised-2: #241e14;--night-hairline: #3a3222;--night-hairline-2: #4a4130;--night-top: #0a0805;--cream: #f1eada;--cream-2: #ede6da;--cream-muted: #a99c82;--cream-muted-2: #857a63;--cream-mono: #c4b99f;--green: #4e7a34;--green-dark: #8fb35b;--green-live: #1e7a5a;--inacc: #c08a1e;--sq-light: #f0e6cf;--sq-dark: #a98f6c;--ink-hover: #2a2117;--row-hover: #ece4cd;--font-serif: "Newsreader", Georgia, "Times New Roman", serif;--font-sans: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--font-mono: "Courier Prime", "Courier New", ui-monospace, monospace;--maxw: 1200px;--pad-x: 32px}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:74px;-webkit-text-size-adjust:100%}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}h1,h2,h3,p{margin:0}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}svg{display:block}img{max-width:100%;display:block}:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}.dark :focus-visible{outline-color:var(--accent-dark)}.skip-link{position:absolute;left:12px;top:-60px;z-index:200;background:var(--ink);color:var(--paper);font-family:var(--font-sans);font-size:12px;font-weight:600;letter-spacing:.08em;padding:10px 16px;border-radius:7px;transition:top .15s ease}.skip-link:focus{top:12px;color:var(--paper)}@keyframes 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var(--pad-x)}.nav__brand{display:flex;align-items:center;gap:11px}.brand-tile{width:30px;height:30px;border-radius:8px;background:var(--ink);display:flex;align-items:center;justify-content:center;overflow:hidden;flex:none}.wordmark{font-family:var(--font-serif);font-size:22px;font-weight:600;color:var(--ink)}.wordmark__dot{color:var(--accent)}.nav__links{display:flex;gap:18px;flex:1;justify-content:center;font-family:var(--font-sans);font-size:11px;letter-spacing:.12em;font-weight:600}.nav__link{color:var(--ink-2b);padding:6px 2px;white-space:nowrap;transition:color .15s ease}.nav__link:hover{color:var(--ink)}.nav__right{display:flex;align-items:center;gap:14px;margin-left:auto}.nav__meta{font-family:var(--font-mono);font-size:10px;color:var(--ink-3);letter-spacing:.05em;white-space:nowrap}.nav__cta{font-family:var(--font-sans);font-size:10.5px;letter-spacing:.1em;font-weight:600;color:var(--paper);background:var(--accent);border-radius:7px;padding:9px 15px;white-space:nowrap;transition:filter .15s ease}.nav__cta:hover{color:var(--paper);filter:brightness(1.12)}.hero{display:flex;flex-direction:column;align-items:center;padding:84px var(--pad-x) 0 var(--pad-x);background:var(--paper)}.hero__head{max-width:880px;display:flex;flex-direction:column;align-items:center;gap:22px;text-align:center}.hero__eyebrow{display:flex;align-items:center;gap:10px}.hero__eyebrow-rule{width:22px;height:1px;background:var(--accent)}.hero__h1{font-family:var(--font-serif);font-size:66px;font-weight:600;color:var(--ink);line-height:1.04;letter-spacing:-.01em;text-wrap:balance}.hero__sub{font-family:var(--font-sans);font-size:17px;color:var(--ink-2b);line-height:1.6;max-width:660px;text-wrap:pretty}.hero__cta-group{display:flex;flex-direction:column;align-items:center;gap:10px;padding-top:6px}.italic{font-style:italic}.btn-ink{display:flex;align-items:center;gap:10px;font-family:var(--font-sans);font-size:12px;letter-spacing:.1em;font-weight:600;color:var(--paper);background:var(--ink);border-radius:9px;padding:15px 28px;box-shadow:0 12px 28px #1c171047;transition:background .15s ease}.btn-ink:hover{color:var(--paper);background:var(--ink-hover)}.btn-accent{display:flex;align-items:center;gap:10px;font-family:var(--font-sans);font-size:12px;letter-spacing:.1em;font-weight:600;color:var(--paper);background:var(--accent);border-radius:9px;padding:15px 28px;box-shadow:0 12px 28px #1c17103d;transition:filter .15s ease}.btn-accent:hover{color:var(--paper);filter:brightness(1.1)}.tech-line{font-family:var(--font-mono);font-size:10.5px;color:var(--ink-3);letter-spacing:.05em}.hero__mock-img{margin-top:58px;width:1100px;max-width:calc(100vw - 64px);height:auto;display:block;border-radius:13px 13px 0 0;box-shadow:0 -30px 80px #1c171024,0 0 0 10px #1c17100a}.mock{margin-top:58px;width:1100px;max-width:calc(100vw - 64px);min-width:0;display:flex;flex-direction:column;background:var(--paper);border-radius:13px 13px 0 0;overflow:hidden;border:1px solid var(--ink-hover);border-bottom:none;box-shadow:0 -30px 80px #1c171024,0 0 0 10px #1c17100a}.mock__scroll{overflow-x:auto;overscroll-behavior-x:contain;max-width:100%}.mock__bar{display:flex;align-items:center;gap:16px;height:42px;padding:0 16px;background:var(--paper-raised);border-bottom:1px solid var(--hairline);flex:none}.mock__lights{display:flex;gap:7px;width:56px;flex:none}.mock__light{width:11px;height:11px;border-radius:50%;border:1px solid rgba(42,33,23,.25)}.mock__wordmark{font-family:var(--font-serif);font-size:17px;font-weight:600;color:var(--ink)}.mock__nav{display:flex;gap:20px;flex:1;justify-content:center;font-family:var(--font-sans);font-size:9.5px;letter-spacing:.12em;font-weight:600}.mock__nav-item{color:var(--ink-2b);padding:12px 2px 10px}.mock__nav-item--active{color:var(--ink);border-bottom:2px solid var(--accent)}.mock__run{font-family:var(--font-sans);font-size:9px;letter-spacing:.1em;font-weight:600;color:var(--paper);border-radius:6px;padding:6px 11px;background:var(--accent)}.mock__body{display:grid;grid-template-columns:216px 1fr 256px;min-height:0;min-width:760px}.mock__col-left{display:flex;flex-direction:column;gap:12px;padding:16px;border-right:1px solid var(--hairline)}.mock__label{font-family:var(--font-sans);font-size:8.5px;letter-spacing:.14em;font-weight:700;color:var(--ink-3)}.mock__opening-title{font-family:var(--font-serif);font-size:14px;font-weight:500;color:var(--ink);line-height:1.3}.mock__opening-meta{font-family:var(--font-mono);font-size:9px;color:var(--ink-2b)}.wdl-summary{display:flex;height:18px;border-radius:4px;overflow:hidden;border:1px solid var(--hairline-strong-2);font-family:var(--font-mono);font-size:9px;font-weight:700}.wdl-summary>span{display:flex;align-items:center;justify-content:center}.wdl-w{background:var(--paper-inset);color:var(--ink-2)}.wdl-d{background:var(--hairline-strong);color:#3a3226}.wdl-l{background:#3a3226;color:var(--hairline)}.mock__exp-rows{display:flex;flex-direction:column}.exp-row{display:grid;grid-template-columns:56px 1fr 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var(--hairline-strong-2);border-radius:3px;overflow:hidden;display:flex;flex-direction:column;background:#2e271c}.eval__white{height:54%;background:var(--paper-inset);border-top:1.5px solid var(--accent)}.eval__num{font-family:var(--font-mono);font-size:9px;font-weight:700;color:var(--ink-2)}.mock__col-right{display:flex;flex-direction:column;border-left:1px solid var(--hairline)}.mock__engine{display:flex;flex-direction:column;gap:8px;padding:14px 16px;border-bottom:1px solid var(--hairline)}.mock__engine-head{display:flex;align-items:center;justify-content:space-between}.mock__engine-name{display:flex;align-items:center;gap:7px;font-family:var(--font-sans);font-size:8.5px;letter-spacing:.14em;font-weight:700;color:var(--ink)}.mock__engine-depth{font-family:var(--font-mono);font-size:8.5px;color:var(--ink-3)}.dot{border-radius:50%;display:inline-block;flex:none}.dot--live-green{width:6px;height:6px;background:var(--green-live)}.line-row{display:grid;grid-template-columns:44px 1fr;align-items:center;gap:8px}.line-row__ev{font-family:var(--font-mono);font-size:10px;font-weight:700;color:var(--ink);background:#eae2cc;border:1px solid var(--hairline-strong);border-radius:4px;padding:2px 0;text-align:center}.line-row__pv{font-family:var(--font-mono);font-size:10px;color:var(--ink-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mock__moves{display:flex;flex-direction:column;padding:10px 8px;flex:1}.move-row{display:grid;grid-template-columns:24px 1fr 1fr;align-items:center;gap:4px;font-family:var(--font-mono);font-size:11px;color:var(--ink)}.move-row__n{color:var(--ink-3b);font-size:9.5px;padding:3px 0 3px 8px}.move-row__w{padding:3px 8px;border-radius:4px}.move-row__b{padding:3px 8px}.move-mark{font-weight:700}.mock__accuracy{display:flex;align-items:baseline;gap:8px;padding:10px 8px 4px;border-top:1px solid 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var(--pad-x)}.studio__head{display:flex;flex-direction:column;gap:14px;max-width:720px}.h2{font-family:var(--font-serif);font-weight:600;line-height:1.1;letter-spacing:-.01em;color:var(--ink)}.h2--dark{color:var(--cream)}.studio__h2{font-size:42px}.studio__intro{font-family:var(--font-sans);font-size:15.5px;color:var(--cream-muted);line-height:1.6;text-wrap:pretty}.studio__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.tool-card{display:flex;flex-direction:column;gap:12px;background:var(--night-raised-2);border:1px solid var(--night-hairline);border-radius:13px;padding:24px 24px 22px;transition:border-color .15s 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var(--pad-x)}.repertoire__copy{display:flex;flex-direction:column;gap:18px}.repertoire__h2{font-size:44px;line-height:1.08;text-wrap:balance}.section-lead{font-family:var(--font-sans);font-size:15.5px;color:var(--ink-2b);line-height:1.65;text-wrap:pretty}.diamond-points{display:grid;grid-template-columns:1fr 1fr;gap:10px 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18px}.known-card__body{display:flex;flex-direction:column;gap:2px}.known-card__title{font-family:var(--font-serif);font-size:15px;font-weight:600;color:var(--ink)}.known-card__meta{font-family:var(--font-mono);font-size:9px;color:var(--ink-3);letter-spacing:.04em}.weak-card{flex:1;display:flex;flex-direction:column;justify-content:center;gap:5px;background:var(--paper-card);border:1px solid var(--hairline);border-radius:12px;padding:16px 18px}.weak-card__label{display:flex;align-items:center;gap:7px;font-family:var(--font-sans);font-size:9px;letter-spacing:.13em;font-weight:700;color:var(--accent)}.weak-card__quote{font-family:var(--font-serif);font-style:italic;font-size:13.5px;color:var(--ink);line-height:1.45}.explorer{background:var(--paper-raised);border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline)}.explorer__inner{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:430px 1fr;gap:64px;align-items:center;padding:96px var(--pad-x)}.explorer__aside{display:flex;flex-direction:column;gap:12px}.najdorf-card{display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--hairline-strong);border-radius:14px;padding:22px;box-shadow:0 24px 54px #1c17101f}.najdorf-card__head{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:2px 12px;padding-bottom:12px}.najdorf-card__title{font-family:var(--font-serif);font-size:17px;font-weight:600;color:var(--ink)}.najdorf-card__meta{font-family:var(--font-mono);font-size:9.5px;color:var(--ink-3)}.najdorf-row{display:grid;grid-template-columns:64px 1fr 52px;align-items:center;gap:10px;padding:7px 6px;border-radius:6px;transition:background .12s 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var(--hairline-strong)}.najdorf-card__transp{font-family:var(--font-mono);font-size:9px;color:var(--ink-3)}.explorer__caption{font-family:var(--font-serif);font-style:italic;font-size:13.5px;color:var(--ink-2b);text-align:center}.explorer__copy{display:flex;flex-direction:column;gap:18px}.explorer__h2{font-size:44px;line-height:1.08;text-wrap:balance}.serif-inline{font-style:italic;font-family:var(--font-serif)}.two-points{display:grid;grid-template-columns:1fr 1fr;gap:10px 24px}.stat-cards{display:flex;gap:14px;padding-top:4px}.stat-card{flex:1;display:flex;flex-direction:column;gap:3px;background:var(--paper);border:1px solid var(--hairline-strong);border-radius:11px;padding:16px 20px}.stat-card__num{font-family:var(--font-serif);font-size:30px;font-weight:600;color:var(--ink);line-height:1}.stat-card__label{font-family:var(--font-mono);font-size:9.5px;color:var(--ink-3);letter-spacing:.05em}.engines{background:var(--paper)}.engines__inner{max-width:var(--maxw);margin:0 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