:root{--cream-50: #fbf7ef;--cream-100: #f5efe4;--cream-200: #ece3d2;--cream-300: #d9cdb6;--ink-900: #2a2623;--ink-700: #4a433c;--ink-500: #5c564f;--ink-300: #5c564f;--sage-900: #1f4d40;--sage-700: #2f6b5a;--sage-500: #4a8f7b;--sage-100: #dfeae4;--clay-700: #8a3d28;--clay-500: #b96a4a;--clay-100: #f1dfd4;--gold-500: #c79a3c;--gold-100: #f3e6c3;--font-display: "Fraunces", Georgia, "Times New Roman", serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--space-7: 3rem;--space-8: 4rem;--space-9: 6rem;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 20px;--shadow-card: 0 1px 2px rgba(42, 38, 35, .04), 0 8px 24px rgba(42, 38, 35, .06);--shadow-card-hover: 0 2px 4px rgba(42, 38, 35, .06), 0 16px 32px rgba(42, 38, 35, .1);--shadow-board: 0 2px 4px rgba(42, 38, 35, .05), 0 20px 48px rgba(42, 38, 35, 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1rem);max-height:calc(100vh - 1rem)}.rc{max-height:calc(100vh - 1rem);border-radius:18px}.rc-head{grid-template-columns:minmax(0,1fr) 84px;align-items:start;padding:3.1rem var(--space-4) var(--space-4);gap:var(--space-3)}.rc-head:after{left:var(--space-4);right:var(--space-4)}.rc-eyebrow{font-size:.62rem;letter-spacing:.14em}.rc-seal{width:84px;height:84px;margin:.35rem 0 0;justify-self:end}.rc-seal-word{font-size:.8rem;padding:0 6px}.rc-title{font-size:1.7rem}.rc-headline{font-size:1rem}.rc-close{top:var(--space-3);right:var(--space-3);width:32px;height:32px}.rc-body{padding:var(--space-4) var(--space-4) var(--space-3);gap:var(--space-4)}.rc-move-strip{grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}.rc-move{padding:var(--space-2) 2px;border-radius:9px}.rc-move-san{font-size:.98rem}.rc-move-band-label{display:none}.rc-move-reply{font-size:.64rem}.rc-sparkline,.rc-grid{grid-template-columns:1fr}.rc-facts{grid-template-columns:repeat(2,minmax(0,1fr))}.rc-foot{padding:var(--space-3) var(--space-4) var(--space-4)}.rc-btn{min-width:0;flex:1 1 100%}}[data-board=classic] .cm-chessboard .board .square.white{fill:#ecdab9}[data-board=classic] .cm-chessboard .board .square.black{fill:#c5a076}[data-board=classic] .cm-chessboard .board .border{fill:#c5a076;stroke:#c5a076}[data-board=classic] .cm-chessboard .coordinates .coordinate.white{fill:#b5936d}[data-board=classic] .cm-chessboard .coordinates .coordinate.black{fill:#eeddbf}[data-board=walnut] .cm-chessboard .board .square.white{fill:url(#f15m-walnut-light)}[data-board=walnut] .cm-chessboard .board .square.black{fill:url(#f15m-walnut-dark)}[data-board=walnut] .cm-chessboard .board .border{fill:#5e3f23;stroke:#5e3f23}[data-board=walnut] .cm-chessboard .coordinates .coordinate.white{fill:#6b4727}[data-board=walnut] .cm-chessboard .coordinates .coordinate.black{fill:#f0dcba}[data-board=walnut] .cm-chessboard .markers .marker-dot circle{fill:#3b2a18}[data-board=slate] .cm-chessboard .board .square.white{fill:url(#f15m-slate-light)}[data-board=slate] .cm-chessboard .board .square.black{fill:url(#f15m-slate-dark)}[data-board=slate] .cm-chessboard .board .border{fill:#4a5661;stroke:#4a5661}[data-board=slate] .cm-chessboard .coordinates .coordinate.white{fill:#4e5c68}[data-board=slate] .cm-chessboard .coordinates .coordinate.black{fill:#e6ecf0}[data-board=slate] .cm-chessboard .markers .marker-dot circle{fill:#1f6f7a}[data-board=marble] .cm-chessboard .board .square.white{fill:url(#f15m-marble-light)}[data-board=marble] .cm-chessboard .board .square.black{fill:url(#f15m-marble-dark)}[data-board=marble] .cm-chessboard .board .border{fill:#8f9b93;stroke:#8f9b93}[data-board=marble] .cm-chessboard .coordinates .coordinate.white{fill:#6f7b74}[data-board=marble] .cm-chessboard .coordinates .coordinate.black{fill:#fff}[data-board=marble] .cm-chessboard .markers .marker-dot circle{fill:#2f6b5a}[data-board=tournament] .cm-chessboard .board .square.white{fill:#eeeed2}[data-board=tournament] .cm-chessboard .board .square.black{fill:#769656}[data-board=tournament] .cm-chessboard .board .border{fill:#5c7a42;stroke:#5c7a42}[data-board=tournament] .cm-chessboard .coordinates .coordinate.white{fill:#5f7d45}[data-board=tournament] .cm-chessboard .coordinates .coordinate.black{fill:#f0f0d0}[data-board=tournament] .cm-chessboard .markers .marker-dot circle{fill:#2b3f1e}[data-board=porcelain] .cm-chessboard .board .square.white{fill:#e4ecf3}[data-board=porcelain] .cm-chessboard .board .square.black{fill:#7f9db9}[data-board=porcelain] .cm-chessboard .board .border{fill:#5f7f9c;stroke:#5f7f9c}[data-board=porcelain] .cm-chessboard .coordinates .coordinate.white{fill:#44617b}[data-board=porcelain] .cm-chessboard .coordinates .coordinate.black{fill:#f4f8fb}[data-board=porcelain] .cm-chessboard .markers .marker-dot circle{fill:#1f4a6e}[data-board=obsidian] .cm-chessboard .board .square.white{fill:url(#f15m-obsidian-light)}[data-board=obsidian] .cm-chessboard .board .square.black{fill:url(#f15m-obsidian-dark)}[data-board=obsidian] .cm-chessboard .board .border{fill:#2d343c;stroke:#2d343c}[data-board=obsidian] .cm-chessboard .coordinates .coordinate.white{fill:#2a3139}[data-board=obsidian] .cm-chessboard .coordinates .coordinate.black{fill:#d6dde3}[data-board=obsidian] .cm-chessboard .markers .marker-dot circle{fill:#d9b45a}.board-preview{display:block;width:100%;height:auto;border-radius:6px;overflow:hidden}[data-theme=midnight]{color-scheme:dark;--cream-50: #121816;--cream-100: #1a221f;--cream-200: #26302b;--cream-300: #37443d;--ink-900: #efe9dc;--ink-700: #d3cbbb;--ink-500: #ada48f;--ink-300: #a39a88;--sage-900: #e4cf98;--sage-700: #c3a661;--sage-500: #8fb3a0;--sage-100: #233129;--clay-700: #e6a58a;--clay-500: #cf8a69;--clay-100: #3a2a24;--gold-500: #d9b45a;--gold-100: #3a3222;--shadow-card: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);--shadow-card-hover: 0 2px 4px rgba(0, 0, 0, .35), 0 16px 32px rgba(0, 0, 0, .45);--shadow-board: 0 2px 4px rgba(0, 0, 0, .4), 0 24px 60px rgba(0, 0, 0, .55);--surface: #1c2521;--rc-ink: #efe9dc;--rc-ink-2: #1f4d40;--rc-ink-soft: rgba(239, 233, 220, .7);--rc-paper: #1a2320;--rc-paper-2: #161e1b;--rc-paper-deep: #202b26;--rc-gold: #d9b45a;--rc-cream-text: #f6efe2}[data-theme=midnight] .hero-board,[data-theme=midnight] .opening-card,[data-theme=midnight] .qblock,[data-theme=midnight] .how-steps li,[data-theme=midnight] .center-hud-score,[data-theme=midnight] .position-reading .rc-fact,[data-theme=midnight] .rc-fact,[data-theme=midnight] .rc-card,[data-theme=midnight] .rc-move,[data-theme=midnight] .rc-habit{background:var(--surface)}[data-theme=midnight] .rc-card{box-shadow:none}[data-theme=midnight] .rc-reflect{background:#202b26}[data-theme=midnight] .rc-next{background:#c3a6610f;border-color:#c3a66138}[data-theme=midnight] .rc{border-color:#d9b45a59}[data-theme=midnight] .rc-spark-dot{fill:#1a2320}[data-theme=midnight] .rc-foot .btn-primary{background:var(--gold-500);border-color:var(--gold-500);color:#141a17}[data-theme=midnight] .rc-foot .btn-primary:hover{background:#e8c56d;border-color:#e8c56d}[data-theme=midnight] .btn-primary,[data-theme=midnight] .site-nav .nav-btn-browse,[data-theme=midnight] #btnHint.btn-primary.btn-sm,[data-theme=midnight] .hint-steps li:before,[data-theme=midnight] .overlay-btn[aria-pressed=true],[data-theme=midnight] .hint-next:hover{color:#141a17}[data-theme=midnight] .btn-primary:hover,[data-theme=midnight] .site-nav .nav-btn-browse:hover,[data-theme=midnight] .site-nav .nav-btn-browse:focus-visible{background:var(--sage-900);border-color:var(--sage-900);color:#141a17}[data-theme=midnight] .help-modal::backdrop,[data-theme=midnight] .report-modal::backdrop{background:#0009}[data-theme=midnight] .scorecard-cell.medal-gold,[data-theme=midnight] .scorecard-cell.medal-silver,[data-theme=midnight] .scorecard-cell.medal-bronze{color:#141a17}[data-theme=midnight] .center-hud{background:var(--cream-100)}[data-theme=midnight] .logo-mark{color:var(--sage-700)}[data-theme=midnight] .site-header{border-bottom:1px solid var(--cream-200)}[data-theme=gallery]{--cream-50: #ffffff;--cream-100: #f4f4f2;--cream-200: #e4e4e1;--cream-300: #c9c9c5;--ink-900: #111111;--ink-700: #2b2b2b;--ink-500: #5a5a5a;--ink-300: #5f5f5f;--sage-900: #111111;--sage-700: #c5301f;--sage-500: #c5301f;--sage-100: #fbe9e6;--clay-700: #8a1c12;--clay-500: #b8362a;--clay-100: #f7e3e0;--gold-500: #111111;--gold-100: #ececea;--font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--radius-sm: 0;--radius-md: 0;--radius-lg: 0;--shadow-card: none;--shadow-card-hover: none;--shadow-board: none;--rc-ink: #111111;--rc-ink-2: #111111;--rc-ink-soft: rgba(17, 17, 17, .6);--rc-paper: #ffffff;--rc-paper-2: #f7f7f5;--rc-paper-deep: #efefec;--rc-gold: #c5301f;--rc-gold-soft: rgba(17, 17, 17, .35);--rc-gold-faint: rgba(17, 17, 17, .14);--rc-cream-text: #ffffff;--rc-cream-muted: rgba(255, 255, 255, .72);--rc-sage: #111111}[data-theme=gallery] h1,[data-theme=gallery] h2,[data-theme=gallery] h3,[data-theme=gallery] h4,[data-theme=gallery] .rc-title,[data-theme=gallery] .logo-text{font-weight:700;letter-spacing:-.035em}[data-theme=gallery] .rc-headline,[data-theme=gallery] .rc-closing,[data-theme=gallery] .rc-seal-word,[data-theme=gallery] .rc-habit,[data-theme=gallery] .rc-reflect-list li,[data-theme=gallery] .recap-card-word,[data-theme=gallery] .progress-card-word{font-style:normal}[data-theme=gallery] .eyebrow,[data-theme=gallery] .now-learning-label,[data-theme=gallery] .practice-now-label,[data-theme=gallery] .rc-h-eyebrow,[data-theme=gallery] .rc-eyebrow,[data-theme=gallery] .hint-step-label{color:var(--ink-900);letter-spacing:.16em}[data-theme=gallery] .rc-eyebrow{color:#fffc}[data-theme=gallery] .hero-board,[data-theme=gallery] .opening-card,[data-theme=gallery] .qblock,[data-theme=gallery] .practice-choice,[data-theme=gallery] .help-inner,[data-theme=gallery] .rc,[data-theme=gallery] .rc-card,[data-theme=gallery] .rc-fact,[data-theme=gallery] .rc-move,[data-theme=gallery] .position-reading,[data-theme=gallery] .scorecard-cell,[data-theme=gallery] .mobile-tab,[data-theme=gallery] .practice-empty,[data-theme=gallery] .trainer-hero .overlay-toolbar,[data-theme=gallery] .progress-stat,[data-theme=gallery] .coach-late-options{border-color:var(--ink-900);border-radius:0}[data-theme=gallery] .rc:after{display:none}[data-theme=gallery] .rc-head{background:var(--ink-900);border-bottom:2px solid var(--ink-900)}[data-theme=gallery] .rc-head:after{display:none}[data-theme=gallery] .rc-seal-arc{stroke:var(--sage-700);filter:none}[data-theme=gallery] .rc-reflect,[data-theme=gallery] .rc-next,[data-theme=gallery] .rc-habit,[data-theme=gallery] .coach-depth,[data-theme=gallery] .coach-thread,[data-theme=gallery] .your-move,[data-theme=gallery] .decide-banner,[data-theme=gallery] .takeaway-rule,[data-theme=gallery] .stat,[data-theme=gallery] .leitner-row li,[data-theme=gallery] .phase-chip,[data-theme=gallery] .quality-band,[data-theme=gallery] .eco-chip,[data-theme=gallery] .coverage-chip,[data-theme=gallery] .scorecard-streak,[data-theme=gallery] .rc-theme,[data-theme=gallery] .btn-primary,[data-theme=gallery] .btn-ghost,[data-theme=gallery] .site-nav .nav-btn,[data-theme=gallery] .overlay-btn,[data-theme=gallery] .board-chip-browse{border-radius:0}[data-theme=gallery] .btn-primary{background:var(--ink-900);border-color:var(--ink-900)}[data-theme=gallery] .btn-primary:hover{background:var(--sage-700);border-color:var(--sage-700)}[data-theme=gallery] .site-nav .nav-btn-browse{background:var(--ink-900);border-color:var(--ink-900)}[data-theme=gallery] .site-nav .nav-btn-browse:hover,[data-theme=gallery] .site-nav .nav-btn-browse:focus-visible{background:var(--sage-700);border-color:var(--sage-700)}[data-theme=gallery] .site-nav .nav-btn{border-color:var(--ink-900);color:var(--ink-900)}[data-theme=gallery] .site-nav .nav-btn-browse,[data-theme=gallery] .site-nav .nav-btn-browse:hover,[data-theme=gallery] .site-nav .nav-btn-browse:focus-visible{color:#fff}[data-theme=gallery] .coach-panel,[data-theme=gallery] .header-tagline{border-left-color:var(--ink-900)}[data-theme=gallery] .site-header{border-bottom:2px solid var(--ink-900)}[data-theme=gallery] .site-footer{border-top-color:var(--ink-900)}[data-theme=gallery] .hero-board{border:2px solid var(--ink-900)}[data-theme=gallery] .rc-foot .btn-primary{background:var(--ink-900);border-color:var(--ink-900);box-shadow:none}[data-theme=gallery] .rc-foot .btn-primary:hover{background:var(--sage-700);border-color:var(--sage-700)}[data-theme=gallery] .decide-banner{background:var(--ink-900)}[data-theme=gallery] .decide-banner .btn-primary{background:var(--sage-700);border-color:var(--sage-700);color:#fff}[data-theme=gallery] .trust-dot{background:var(--sage-700);box-shadow:none}[data-theme=manuscript]{--cream-50: #f1e6cf;--cream-100: #e9dbbd;--cream-200: #dccaa3;--cream-300: #c8b185;--ink-900: #2b1d12;--ink-700: #4a3826;--ink-500: #6c593f;--ink-300: #6a573f;--sage-900: #5a1616;--sage-700: #7a2323;--sage-500: #a2452e;--sage-100: #ead6bc;--clay-700: #6b2a12;--clay-500: #9a4d2b;--clay-100: #ecd4bf;--gold-500: #b8862b;--gold-100: #ecd9a4;--radius-sm: 3px;--radius-md: 6px;--radius-lg: 8px;--shadow-card: 0 1px 2px rgba(60, 36, 12, .08), 0 10px 24px rgba(60, 36, 12, .12);--shadow-card-hover: 0 2px 4px rgba(60, 36, 12, .1), 0 18px 34px rgba(60, 36, 12, .18);--shadow-board: 0 2px 4px rgba(60, 36, 12, .08), 0 24px 50px rgba(60, 36, 12, .22);--surface: #f8efdc;--rc-ink: #2b1d12;--rc-ink-2: #5a1616;--rc-ink-soft: rgba(43, 29, 18, .7);--rc-paper: #f6ecd6;--rc-paper-2: #efe2c6;--rc-paper-deep: #e9dab8;--rc-gold: #b8862b;--rc-gold-soft: rgba(184, 134, 43, .5);--rc-gold-faint: rgba(184, 134, 43, .22);--rc-sage: #7a2323;--rc-clay: #6b2a12}[data-theme=manuscript] body,[data-theme=manuscript] .page{background:var(--cream-50)}[data-theme=manuscript] h1,[data-theme=manuscript] h2,[data-theme=manuscript] .rc-title,[data-theme=manuscript] .opening-title{font-weight:600;font-style:italic;letter-spacing:-.005em}[data-theme=manuscript] .hero-board,[data-theme=manuscript] .opening-card,[data-theme=manuscript] .qblock,[data-theme=manuscript] .how-steps li,[data-theme=manuscript] .center-hud-score,[data-theme=manuscript] .position-reading .rc-fact{background:var(--surface)}[data-theme=manuscript] .hero-board{border:3px double var(--gold-500);outline:1px solid var(--cream-300);outline-offset:4px}[data-theme=manuscript] .opening-card{border:3px double var(--gold-500)}[data-theme=manuscript] .coach-panel{border-left:3px double var(--sage-700)}[data-theme=manuscript] .header-tagline{border-left:3px double var(--sage-700);font-style:italic}[data-theme=manuscript] .eyebrow,[data-theme=manuscript] .now-learning-label,[data-theme=manuscript] .practice-now-label,[data-theme=manuscript] .rc-h-eyebrow{color:var(--sage-700);letter-spacing:.22em}[data-theme=manuscript] .btn-primary,[data-theme=manuscript] .site-nav .nav-btn-browse{background:var(--sage-700);border:1px solid var(--gold-500);box-shadow:0 0 0 2px var(--surface) inset}[data-theme=manuscript] .btn-ghost{border-color:var(--gold-500)}[data-theme=manuscript] .site-header{border-bottom:3px double var(--gold-500)}[data-theme=manuscript] .site-footer{border-top:3px double var(--gold-500)}[data-theme=manuscript] .rc{border:3px double var(--gold-500)}[data-theme=manuscript] .rc:after{border-color:#b8862b59}[data-theme=manuscript] .rc-head{background:radial-gradient(120% 140% at 100% 0%,rgba(184,134,43,.25),transparent 55%),linear-gradient(160deg,#6e1d1d,#4a1212)}[data-theme=manuscript] .rc-foot .btn-primary{background:var(--sage-700);border-color:var(--gold-500)}[data-theme=manuscript] .decide-banner{background:linear-gradient(160deg,#6e1d1d,#4a1212)}[data-theme=manuscript] .scorecard-cell.filled{border-color:var(--gold-500)}[data-theme=glacier]{--cream-50: #eaf1f6;--cream-100: #f7fafc;--cream-200: #d9e4ec;--cream-300: #b7c9d6;--ink-900: #16232e;--ink-700: #34475a;--ink-500: #5b7083;--ink-300: #5b7083;--sage-900: #1d4e6e;--sage-700: #235f88;--sage-500: #4f9bcb;--sage-100: #dcebf6;--clay-700: #8a3d28;--clay-500: #c0603f;--clay-100: #f6e2d9;--gold-500: #e39a3b;--gold-100: #fbeedd;--radius-sm: 10px;--radius-md: 16px;--radius-lg: 28px;--shadow-card: 0 1px 2px rgba(29, 78, 110, .06), 0 10px 30px rgba(29, 78, 110, .12);--shadow-card-hover: 0 2px 4px rgba(29, 78, 110, .08), 0 18px 40px rgba(29, 78, 110, .18);--shadow-board: 0 2px 4px rgba(29, 78, 110, .06), 0 30px 60px -20px rgba(29, 78, 110, .35);--surface: rgba(255, 255, 255, .72);--rc-ink: #16232e;--rc-ink-2: #1d4e6e;--rc-ink-soft: rgba(22, 35, 46, .7);--rc-paper: #f4f8fb;--rc-paper-2: #eaf1f6;--rc-paper-deep: #e0eaf1;--rc-gold: #e39a3b;--rc-gold-soft: rgba(42, 111, 158, .35);--rc-gold-faint: rgba(42, 111, 158, .14);--rc-sage: #4f9bcb}[data-theme=glacier] body{background:linear-gradient(180deg,#e5eef5,#f3f7fa 60%,#eaf1f6);background-attachment:fixed}[data-theme=glacier] .hero-board,[data-theme=glacier] .opening-card,[data-theme=glacier] .qblock,[data-theme=glacier] .how-steps li,[data-theme=glacier] .center-hud-score,[data-theme=glacier] .practice-choice,[data-theme=glacier] .progress-stat,[data-theme=glacier] .position-reading{background:var(--surface);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.85)}[data-theme=glacier] .btn-primary,[data-theme=glacier] .btn-ghost,[data-theme=glacier] .rc-btn,[data-theme=glacier] .practice-choice,[data-theme=glacier] .mobile-tab,[data-theme=glacier] .overlay-btn{border-radius:999px}[data-theme=glacier] .btn-primary{background:linear-gradient(180deg,#3a86b8,#2a6f9e);box-shadow:0 8px 20px -10px #2a6f9ecc}[data-theme=glacier] .site-nav .nav-btn-browse{background:linear-gradient(180deg,#3a86b8,#2a6f9e);border-color:transparent}[data-theme=glacier] .coach-panel,[data-theme=glacier] .header-tagline{border-left-color:var(--sage-500)}[data-theme=glacier] .rc{border-radius:28px;border-color:#ffffffe6}[data-theme=glacier] .rc:after{border-radius:20px}[data-theme=glacier] .rc-head{background:radial-gradient(120% 140% at 100% 0%,rgba(227,154,59,.2),transparent 55%),linear-gradient(160deg,#2a6f9e,#1d4e6e)}[data-theme=glacier] .rc-card,[data-theme=glacier] .rc-fact,[data-theme=glacier] .rc-move{background:#ffffffb3}[data-theme=glacier] .rc-foot .btn-primary{background:linear-gradient(180deg,#3a86b8,#2a6f9e);border-color:transparent}[data-theme=glacier] .decide-banner{background:linear-gradient(160deg,#2a6f9e,#1d4e6e);border-radius:20px}[data-theme=glacier] .scorecard-cell{border-radius:10px}[data-theme=glacier] .site-footer{border-top-color:#2a6f9e33}[data-theme=midnight] .trainer-hero .overlay-toolbar,[data-theme=midnight] .position-reading{background:var(--cream-100)}.site-nav .nav-btn-icon{width:32px;height:32px;padding:0;display:inline-flex;align-items:center;justify-content:center;color:var(--ink-500);border-color:transparent}.site-nav .nav-btn-icon svg{width:18px;height:18px;display:block}.site-nav .nav-btn-icon:hover,.site-nav .nav-btn-icon:focus-visible{border-color:var(--cream-300)}.appearance-modal{max-width:min(880px,100vw - 2rem)}.appearance-inner{max-width:none}.appearance-sub{margin:var(--space-2) 0 0!important;color:var(--ink-500);font-size:.9rem}.appearance-hint{margin:0 0 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