:root{--bg:#faf7f2;--text:#22201c;--muted:#6b645a;--accent:#7a5230;--accent-2:#a8743f;--line:#e4ddd2;--light:#f0d9b5;--dark:#b58863;--card:#fff;--piece-font:"Segoe UI Symbol", "Apple Symbols", "Noto Sans Symbols 2", "DejaVu Sans", "Arial Unicode MS", serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);margin:0;font:17px/1.65 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}a{color:var(--accent)}a:hover{color:var(--accent-2)}.wrap{max-width:760px;margin:0 auto;padding:0 16px}.site-header{border-bottom:1px solid var(--line);background:#fff}.site-header .wrap{align-items:center;height:48px;display:flex}.logo{color:var(--text);font-size:16px;font-weight:700;text-decoration:none}.logo span{font-family:var(--piece-font);color:var(--accent)}.site-footer{border-top:1px solid var(--line);color:var(--muted);text-align:center;margin-top:56px;padding:24px 0 40px;font-size:14px}.site-footer nav{justify-content:center;gap:24px;margin-bottom:8px;display:flex}.hero{padding-top:16px}h1{text-align:center;margin:0 0 12px;font-size:28px;line-height:1.2}.tool{max-width:560px;margin:0 auto}.toolbar{justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px;display:flex}.tabs{background:#efe8dd;border-radius:10px;flex:1;gap:4px;min-width:0;padding:4px;display:flex}.tab{color:var(--muted);cursor:pointer;white-space:nowrap;background:0 0;border:0;border-radius:7px;flex:1;padding:8px 4px;font:600 14px/1.2 inherit}.tab.active{color:var(--text);background:#fff;box-shadow:0 1px 2px #0000001f}.btn{border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;border-radius:8px;padding:10px 14px;font:600 15px/1.2 inherit}.btn:hover{background:var(--accent-2);border-color:var(--accent-2)}.btn.ghost{color:var(--accent);background:#fff;padding:8px 12px}.btn.ghost:hover{background:#f6efe6}.board{aspect-ratio:1;-webkit-user-select:none;user-select:none;touch-action:manipulation;border:2px solid #5b4126;border-radius:4px;grid-template-rows:repeat(8,1fr);grid-template-columns:repeat(8,1fr);width:100%;display:grid;overflow:hidden;container-type:inline-size}.sq{cursor:pointer;-webkit-tap-highlight-color:transparent;border:0;justify-content:center;align-items:center;min-width:0;min-height:0;margin:0;padding:0;display:flex;position:relative}.sq.light{background:var(--light)}.sq.dark{background:var(--dark)}.sq.selected{background-image:linear-gradient(#50aa3c59,#50aa3c59);box-shadow:inset 0 0 0 4px #2f7d32}.sq:focus-visible{outline-offset:-3px;z-index:1;outline:3px solid #1e5bd8}.coord{pointer-events:none;font:700 2.2cqw/1 system-ui,sans-serif;position:absolute}.coord.rank{top:3px;left:3px}.coord.file{bottom:2px;right:4px}.sq.light .coord{color:var(--dark)}.sq.dark .coord{color:var(--light)}.piece{font-family:var(--piece-font);cursor:grab;font-size:10cqw;line-height:1}.piece.w{color:#fff;-webkit-text-stroke:.06em #1b1b1b;paint-order:stroke fill;text-shadow:0 1px #00000040}.piece.b{color:#1b1b1b;text-shadow:0 1px #ffffff40}.rule-line{text-align:center;color:var(--muted);margin:8px 0 0;font-size:14px;font-weight:600}.actions{grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px;display:grid}.spares{grid-template-columns:repeat(13,1fr);gap:3px;margin-top:12px;display:grid;container-type:inline-size}.spare{aspect-ratio:1;border:1px solid var(--line);cursor:pointer;color:var(--muted);background:#fff;border-radius:6px;justify-content:center;align-items:center;padding:0;font-size:4cqw;display:flex}.spare .piece{font-size:5.6cqw}.spare.selected{background:#eef7ec;border-color:#2f7d32;box-shadow:0 0 0 2px #2f7d32}.status{text-align:center;color:var(--muted);min-height:1.4em;margin:8px 0 0;font-size:13px}.content{padding-top:40px}h2{margin:0 0 12px;font-size:24px;line-height:1.25}h3{margin:24px 0 8px;font-size:18px}.steps{padding-left:22px}.steps li{margin-bottom:10px}.table-wrap{overflow-x:auto}table{border-collapse:collapse;background:var(--card);border:1px solid var(--line);width:100%;font-size:15px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:8px 12px}th{background:#f3ede4}.note{color:var(--muted);font-size:13px}.small{color:var(--muted);font-size:14px}.diagram{text-align:center;margin:16px 0}.diagram img{border:1px solid var(--line);background:#fff;border-radius:8px;max-width:100%;height:auto}.diagram figcaption{color:var(--muted);margin-top:6px;font-size:14px}.video-box{background:var(--card);border:1px solid var(--line);border-radius:10px;margin:20px 0 24px;overflow:hidden}.video-box video{aspect-ratio:16/9;background:#f3ede4;width:100%;height:auto;display:block}.video-box figcaption{color:var(--muted);border-top:1px solid var(--line);padding:10px 14px;font-size:14px}.openings{padding-left:20px}.openings li{margin-bottom:10px}code.move{border:1px solid var(--line);color:var(--accent);background:#f3ede4;border-radius:5px;padding:2px 6px;font:700 .92em/1.2 ui-monospace,SFMono-Regular,Menlo,monospace}.faq details{background:var(--card);border:1px solid var(--line);border-radius:8px;margin-bottom:10px;padding:12px 16px}.faq summary{cursor:pointer;font-weight:600}.faq details p{margin:8px 0 0}.cards{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.cards li{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px 16px}.cards li.is-soon{background:#f6f2eb;border-style:dashed}.card-head{justify-content:space-between;align-items:center;gap:8px;margin-bottom:6px;display:flex}.card-label{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-size:12px}.badge-soon{color:var(--muted);white-space:nowrap;background:#ebe5dc;border-radius:999px;padding:2px 8px;font-size:11px;line-height:1.4}.card-text{color:var(--muted);font-size:15px}.cards a{color:var(--accent);font-weight:600;text-decoration:none}.cards a:hover{text-decoration:underline}.page{padding-top:32px}@media (max-width:480px){body{font-size:16px}h1{margin-bottom:8px;font-size:24px}.hero{padding-top:10px}.wrap{padding:0 10px}.tab{padding:8px 2px;font-size:13px}.btn{white-space:nowrap;padding:10px 4px;font-size:14px}.rule-line{font-size:13px}.btn.ghost{padding:8px}.spares{grid-template-columns:repeat(7,1fr)}.spare{font-size:7cqw}.spare .piece{font-size:10cqw}}@media (max-width:370px){.btn{font-size:13px}.tab{font-size:12px}}@media print{body{background:#fff}body *{visibility:hidden}.print-area,.print-area *{visibility:visible}.print-area{width:100%;padding:10mm;position:absolute;top:0;left:0}.board{-webkit-print-color-adjust:exact;print-color-adjust:exact;max-width:170mm;margin:0 auto}.sq.selected{box-shadow:none;background-image:none}}