.site{--ink: #1f2430;--muted: #5d6475;--line: #e3e5ec;--brand: #5b6bd6;--brand-dark: #4654b8;--accent: #4caf50;min-height:100vh;display:flex;flex-direction:column;background:#f7f8fb;color:var(--ink);line-height:1.6}.site a{color:var(--brand-dark)}.site-header{position:sticky;top:0;z-index:50;background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 2px 8px #00000026}.site-header-inner{max-width:1120px;margin:0 auto;padding:.7rem 1rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.site .site-logo{color:#fff;font-weight:700;font-size:1.3rem;text-decoration:none}.site-menu-btn{display:none;margin-left:auto;color:#fff;font-size:1.5rem;padding:.2rem .6rem}.site-nav{display:flex;align-items:center;gap:1.1rem;flex:1}.site .site-nav a:not(.site-btn){color:#ffffffe6;text-decoration:none;font-weight:500}.site .site-nav a:not(.site-btn):hover,.site .site-nav a[aria-current=page]{color:#fff;text-decoration:underline;text-underline-offset:4px}.site-nav-spacer{flex:1}.site .site-user{font-weight:700}.site .site-btn{display:inline-block;padding:.5rem 1rem;border-radius:8px;font-weight:600;text-decoration:none;border:1px solid transparent;cursor:pointer;font-size:.95rem;line-height:1.3}.site .site-btn.primary{background:var(--accent);color:#fff}.site .site-btn.primary:hover{background:#43a047}.site .site-btn.ghost{background:#ffffff29;color:#fff}.site .site-btn.outline{background:#fff;color:var(--brand-dark);border-color:var(--brand)}.site .site-btn.outline:hover{background:#eef0fc}.site .site-btn.large{padding:.85rem 1.6rem;font-size:1.05rem;border-radius:10px}.site-main{flex:1}.site-footer{background:#1f2430;color:#c9cdd8;font-size:.9rem}.site-footer-inner{max-width:1120px;margin:0 auto;padding:1.2rem 1rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.site-footer nav{display:flex;gap:1.2rem;flex-wrap:wrap}.site .site-footer a{color:#c9cdd8;text-decoration:none}.site .site-footer a:hover{color:#fff;text-decoration:underline}.container{max-width:1120px;margin:0 auto;padding:2.5rem 1rem}.container.narrow{max-width:820px}.page-title{font-size:2rem;line-height:1.25;margin-bottom:.5rem}.page-lead{color:var(--muted);font-size:1.1rem;margin-bottom:2rem}.prose h2{font-size:1.4rem;margin:2rem 0 .6rem}.prose h3{font-size:1.1rem;margin:1.2rem 0 .4rem}.prose p,.prose ul,.prose ol{margin-bottom:.9rem}.prose ul,.prose ol{padding-left:1.4rem}.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:1.25rem}.not-found{text-align:center;padding:5rem 1rem}.not-found .code{font-size:5rem;font-weight:800;color:var(--brand);line-height:1}.site-loading{display:flex;align-items:center;justify-content:center;min-height:50vh;color:var(--muted)}@media (max-width: 760px){.site-menu-btn{display:block}.site-nav{display:none;flex-basis:100%;flex-direction:column;align-items:stretch;gap:.4rem;padding:.5rem 0 .8rem}.site-nav.open{display:flex}.site-nav a,.site-nav .site-btn{padding:.6rem .4rem;text-align:left}.site-nav-spacer{display:none}.page-title{font-size:1.6rem}}.legal-note{margin-top:2rem;padding:.8rem 1rem;background:#fff8e1;border:1px solid #ffe082;border-radius:8px;font-size:.9rem;color:#6d5300}.auth-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem;background:linear-gradient(135deg,#667eea,#764ba2)}.auth-card{width:100%;max-width:380px;background:#fff;border-radius:12px;padding:2rem;box-shadow:0 8px 30px #00000040;display:flex;flex-direction:column;gap:1rem}.auth-title{margin:0;text-align:center;font-size:1.6rem;color:#333}.auth-subtitle{margin:-.5rem 0 0;text-align:center;color:#666;font-size:.95rem}.auth-tabs{display:flex;background:#f0f0f0;border-radius:8px;padding:4px}.auth-tabs button{flex:1;padding:.5rem;border:none;border-radius:6px;background:transparent;font-weight:600;color:#666;cursor:pointer}.auth-tabs button.active{background:#fff;color:#2196f3;box-shadow:0 1px 3px #00000026}.auth-field{display:flex;flex-direction:column;gap:.35rem;font-size:.85rem;font-weight:600;color:#333}.auth-field input{padding:.7rem .8rem;border:1px solid #ccc;border-radius:6px;font-size:1rem;font-weight:400}.auth-field input:focus{outline:none;border-color:#2196f3;box-shadow:0 0 0 3px #2196f333}.auth-error{padding:.6rem .8rem;background:#fdecea;border:1px solid #f5c2c0;border-radius:6px;color:#b71c1c;font-size:.9rem}.auth-submit{padding:.8rem;border:none;border-radius:8px;background:#4caf50;color:#fff;font-size:1rem;font-weight:600;cursor:pointer}.auth-submit:hover:not(:disabled){background:#45a049}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.auth-loading{min-height:100vh;display:flex;align-items:center;justify-content:center;color:#666;font-size:1.1rem}@media (max-width: 480px){.auth-card{padding:1.25rem}}.auth-home{color:inherit;text-decoration:none}.auth-back{text-align:center;font-size:.9rem}.auth-back a{color:#4654b8}.auth-error-detail{display:block;margin-top:.3rem;font-family:Courier New,monospace;font-size:.78rem;word-break:break-word;opacity:.85}.review-badge{position:absolute;top:.5rem;left:50%;transform:translate(-50%);z-index:20;display:flex;align-items:center;gap:.7rem;padding:.35rem .4rem .35rem .9rem;background:#fff3cd;border:1px solid #ffc107;border-radius:999px;font-size:.85rem;font-weight:600;color:#6d5300;box-shadow:0 2px 8px #0003;white-space:nowrap}.review-badge button{padding:.3rem .8rem;border-radius:999px;background:#ff9800;color:#fff;font-weight:700}.review-badge.inline{position:static;transform:none;margin:.7rem auto 0;width:fit-content}.eval-bar{position:relative;flex:0 0 22px;width:22px;align-self:stretch;background:#262626;border-radius:4px;overflow:hidden;box-shadow:0 0 0 1px #0003}.eval-white{position:absolute;left:0;right:0;bottom:0;background:#f4f4f4;transition:height .45s ease}.eval-bar.flipped .eval-white{bottom:auto;top:0}.eval-label{position:absolute;left:0;right:0;text-align:center;font-size:.62rem;font-weight:700;line-height:1;padding:3px 0;font-variant-numeric:tabular-nums}.eval-label.on-white{bottom:0;color:#222}.eval-label.on-black{top:0;color:#eee}.eval-bar.flipped .eval-label.on-white{bottom:auto;top:0}.eval-bar.flipped .eval-label.on-black{top:auto;bottom:0}.eval-bar.floating{position:absolute;left:.7rem;top:18%;bottom:18%;height:auto;z-index:10}@media (prefers-reduced-motion: reduce){.eval-white{transition:none}}.piece{position:relative;z-index:1;width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:11cqw;line-height:1;cursor:grab;user-select:none;-webkit-user-select:none;touch-action:none}.piece:active{cursor:grabbing}.piece.white{color:#fff;text-shadow:1px 1px 2px rgba(0,0,0,.5)}.piece.black{color:#000;text-shadow:1px 1px 2px rgba(255,255,255,.3)}.piece.slide{z-index:5;animation:piece-slide .19s ease-out}.piece.dragging{opacity:.25}@keyframes piece-slide{0%{transform:translate(calc(var(--dx) * 100%),calc(var(--dy) * 100%))}to{transform:translate(0)}}@media (prefers-reduced-motion: reduce){.piece.slide{animation:none}}.drag-ghost{position:fixed;z-index:1000;pointer-events:none;transform:translate(-50%,-50%);line-height:1}@container (max-width: 520px){.piece{font-size:13.2cqw}}.square{position:relative;width:100%;height:100%;aspect-ratio:1;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background-color .2s ease;-webkit-user-select:none;user-select:none}.square.light{background-color:#f0d9b5}.square.dark{background-color:#b58863}.square.selected{background-color:#baca44}.square.last-move:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#ffeb3b61;pointer-events:none}.square.in-check{background-image:radial-gradient(circle,#ff0000e6,#e74c3c8c 45%,#e74c3c00 72%)}.square.legal-target.has-piece:after{content:"";position:absolute;top:4%;right:4%;bottom:4%;left:4%;border-radius:50%;box-shadow:inset 0 0 0 4px #204a878c;pointer-events:none}.legal-marker{width:28%;height:28%;background-color:#204a878c;border-radius:50%;pointer-events:none}@media (hover: hover){.square:hover{box-shadow:inset 0 0 0 3px #fff6}}.square:focus-visible{outline:3px solid #1e88e5;outline-offset:-3px;z-index:6}.sq-label{position:absolute;font-size:max(9px,1.9cqw);font-weight:700;line-height:1;pointer-events:none;-webkit-user-select:none;user-select:none}.sq-label.rank{top:3%;left:4%}.sq-label.file{bottom:3%;right:4%}.square.light .sq-label{color:#b58863}.square.dark .sq-label{color:#f0d9b5}.square.hint-from,.square.hint-to{box-shadow:inset 0 0 0 4px #2ea043f2}.square.hint-to:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#2ea04347;pointer-events:none}.board-2d-wrap{width:100%;max-width:600px;display:flex;flex-direction:column;align-items:center;justify-content:center}.board-2d-main{display:flex;align-items:stretch;gap:8px;width:100%}.board-2d{position:relative;flex:1 1 auto;min-width:0;width:100%;max-width:600px;aspect-ratio:1;container-type:inline-size}.board-row{display:contents}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.board-grid{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:100%;height:100%;gap:0;background-color:#8b7355}.board-2d.reviewing .board-grid{outline:3px dashed #ffc107;outline-offset:2px}.move-history{background:#fff;border-radius:8px;padding:1rem;box-shadow:0 2px 4px #0000001a;flex:1;overflow:hidden;display:flex;flex-direction:column}.move-history h3{margin:0 0 .75rem;font-size:1rem;color:#333}.moves-list{flex:1;overflow-y:auto;min-height:150px}.no-moves{color:#999;font-size:.9rem;text-align:center;padding:1rem;margin:0}.move-history-head{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.6rem}.move-history-head h3{margin:0;white-space:nowrap}.move-nav{display:flex;gap:.25rem}.move-nav button{width:1.9rem;height:1.9rem;border-radius:6px;background:#eceef6;color:#333;font-size:.85rem}.move-nav button:disabled{opacity:.4;cursor:not-allowed}.moves-grid{display:flex;flex-direction:column;gap:.2rem}.move-row{display:grid;grid-template-columns:2rem 1fr 1fr;gap:.25rem;align-items:center;font-size:.9rem}.move-number{font-weight:600;color:#999}.move-btn{text-align:left;padding:.25rem .5rem;border-radius:4px;background-color:#f5f5f5;font-size:.9rem}.move-btn:hover{background-color:#e3e7f7}.move-btn[aria-current=true]{background-color:#5b6bd6;color:#fff}.white-move{color:#333}.black-move{color:#555}.game-status{background:#fff;border-radius:8px;padding:1rem;box-shadow:0 2px 4px #0000001a}.status-box{padding:.75rem;border-bottom:1px solid #eee;margin-bottom:.75rem}.status-box:last-of-type{border-bottom:none;margin-bottom:0}.status-box.result{background-color:#fff3cd;border-radius:4px;border:1px solid #ffc107}.status-label{font-size:.75rem;font-weight:600;text-transform:uppercase;color:#666;margin-bottom:.25rem}.status-value{font-size:1.1rem;font-weight:600;color:#333}.fen-display{margin-top:1rem;padding-top:1rem;border-top:1px solid #eee}.fen-label{font-size:.75rem;font-weight:600;text-transform:uppercase;color:#666;margin-bottom:.25rem}.fen-value{font-size:.75rem;font-family:Courier New,monospace;background-color:#f5f5f5;padding:.5rem;border-radius:4px;word-break:break-all;color:#333}.status-value.thinking{color:#ff9800;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}@media (max-width: 768px){.game-status{padding:.75rem}.status-box{padding:.5rem;margin-bottom:.5rem}.status-label{font-size:.7rem}.status-value{font-size:1rem}.fen-display{margin-top:.75rem;padding-top:.75rem}.fen-value{font-size:.65rem;padding:.35rem}}.clock-panel{background:#fff;border-radius:8px;padding:.5rem;box-shadow:0 2px 4px #0000001a;display:flex;flex-direction:column;gap:.35rem}.clock-row{display:flex;justify-content:space-between;align-items:center;padding:.5rem .75rem;border-radius:6px;background:#f0f0f0;color:#555}.clock-row.active{background:#333;color:#fff}.clock-row.low .clock-time{color:#e53935}.clock-row.active.low .clock-time{color:#ff8a80}.clock-side{font-weight:600;font-size:.9rem}.clock-time{font-family:Courier New,monospace;font-size:1.4rem;font-weight:700;font-variant-numeric:tabular-nums}.gameio{max-width:560px;max-height:90vh;overflow-y:auto}.gameio-section{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1.25rem}.gameio-section label{font-weight:600;color:#333}.gameio-section textarea{width:100%;padding:.6rem;border:1px solid #ccc;border-radius:6px;font-family:Courier New,monospace;font-size:.85rem;resize:vertical;box-sizing:border-box}.gameio-actions{display:flex;gap:.5rem;flex-wrap:wrap}.gameio-actions button{padding:.5rem .9rem;border:none;border-radius:6px;background:#e8e8e8;color:#333;font-weight:600;cursor:pointer}.gameio-actions button.primary{background:#2196f3;color:#fff;margin-left:auto}.gameio-actions button:disabled{opacity:.5;cursor:not-allowed}.gameio-message{padding:.6rem .8rem;border-radius:6px;font-size:.9rem}.gameio-message.ok{background:#e8f5e9;color:#1b5e20}.gameio-message.error{background:#fdecea;color:#b71c1c}.controls{display:flex;flex-direction:column;gap:1rem}.control-panel{background:#fff;border-radius:8px;padding:1rem;display:flex;flex-direction:column;gap:.75rem;box-shadow:0 2px 4px #0000001a}.btn-block{width:100%;padding:.75rem;border-radius:4px;font-weight:600;transition:all .2s ease;cursor:pointer;border:none;font-size:1rem}@media (max-width: 480px){.control-panel{padding:.75rem;gap:.5rem}.btn-block{padding:.6rem;font-size:.9rem}}.btn-block.btn-primary{background-color:#4caf50;color:#fff}.btn-block.btn-primary:hover{background-color:#45a049}.btn-block.btn-secondary{background-color:#2196f3;color:#fff}.btn-block.btn-secondary:hover{background-color:#0b7dda}.btn-block:disabled{opacity:.5;cursor:not-allowed}.hint-line{margin:-.25rem 0 0;padding:.4rem .6rem;background:#e8f5e9;border-radius:6px;color:#1b5e20;font-size:.9rem;text-align:center}.game-over-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000}.game-over-modal{background:#fff;border-radius:8px;padding:2rem;box-shadow:0 4px 16px #0003;text-align:center;max-width:400px}.game-over-modal h2{margin:0 0 1rem;font-size:1.5rem;color:#333}.result-text{font-size:1.1rem;color:#666;margin-bottom:2rem;line-height:1.6}.btn-large{padding:.75rem 1.5rem;font-size:1.1rem;min-width:150px}.dialog-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:100}.dialog-content{background:#fff;border-radius:12px;padding:2rem;box-shadow:0 4px 20px #0000004d;max-width:500px;width:90%;animation:slideUp .3s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.dialog-content h2{margin:0 0 1.5rem;font-size:1.5rem;color:#333}.dialog-section{margin-bottom:1.5rem}.dialog-section label{display:block;margin-bottom:.75rem;font-weight:600;color:#333}.radio-group{display:flex;flex-direction:column;gap:.5rem}.radio-group label{display:flex;align-items:center;gap:.5rem;margin-bottom:0;font-weight:400;cursor:pointer}.radio-group input[type=radio]{cursor:pointer;accent-color:#2196f3}.slider-container{display:flex;flex-direction:column;gap:1rem}.slider{width:100%;height:6px;border-radius:3px;background:#ddd;outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none}.slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:#2196f3;cursor:pointer;box-shadow:0 2px 4px #0003}.slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#2196f3;cursor:pointer;border:none;box-shadow:0 2px 4px #0003}.level-display{display:flex;justify-content:space-between;align-items:center;padding:.75rem;background:#f5f5f5;border-radius:6px;font-size:.9rem}.level-display span:first-child{font-weight:600;color:#2196f3}.level-name{color:#666;font-style:italic}.dialog-actions{display:flex;gap:1rem;justify-content:flex-end;margin-top:2rem}.btn-cancel,.btn-start{padding:.75rem 1.5rem;border:none;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .2s}.btn-cancel{background:#f0f0f0;color:#333}.btn-cancel:hover{background:#e0e0e0}.btn-start{background:#2196f3;color:#fff}.btn-start:hover{background:#1976d2;box-shadow:0 2px 8px #2196f34d}.btn-start:active{transform:scale(.98)}.dialog-select{width:100%;padding:.6rem;border:1px solid #ccc;border-radius:6px;font-size:1rem;background:#fff}.promotion-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000}.promotion-dialog{background:#fff;padding:2rem;border-radius:8px;box-shadow:0 4px 16px #0000004d;text-align:center}.promotion-dialog h2{margin-bottom:1.5rem;color:#333}.promotion-options{display:flex;gap:1rem}.promotion-btn{padding:.5rem 1.1rem;font-size:2.2rem;line-height:1.2;font-weight:600;background-color:#667eea;color:#fff;border-radius:4px;cursor:pointer;transition:background-color .2s ease}.promotion-btn:hover{background-color:#5568d3}.ad-slot{margin:1.5rem auto;max-width:970px;text-align:center}.ad-slot .ad-label{display:block;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:#8a8fa0;margin-bottom:.25rem}.ad-slot.ad-home,.ad-slot.ad-content{min-height:120px}.ad-slot.ad-game{margin:1.5rem 0 0;min-height:250px}.ad-placeholder{display:flex;align-items:center;justify-content:center;min-height:90px;height:100%;border:2px dashed #c4c8d6;border-radius:8px;color:#8a8fa0;font-size:.9rem;background:repeating-linear-gradient(45deg,#fafbff,#fafbff 10px,#f1f2f8 10px,#f1f2f8 20px)}.ad-slot.ad-game .ad-placeholder{min-height:250px}.ad-consent{position:fixed;left:0;right:0;bottom:0;z-index:200;display:flex;align-items:center;justify-content:center;gap:1rem;flex-wrap:wrap;padding:.8rem 1rem;background:#1f2430;color:#e6e8f0;font-size:.9rem;box-shadow:0 -2px 10px #0000004d}.ad-consent p{margin:0;max-width:720px}.ad-consent a{color:#aab4ff}.ad-consent-actions{display:flex;gap:.5rem}.ad-consent button{padding:.5rem 1.1rem;border-radius:6px;font-weight:600}.ad-consent-accept{background:#4caf50;color:#fff}.ad-consent-decline{background:transparent;color:#e6e8f0;border:1px solid #6b7186}.ad-slot.ad-homeBottom,.ad-slot.ad-bottom{min-height:120px}.ad-slot.ad-gameMobile{margin:1.5rem 0 0;min-height:250px}.ad-rail-wrap{position:fixed;top:6rem;left:calc(50vw + 440px);width:180px;z-index:5}.ad-rail-wrap .ad-slot{margin:0}.ad-slot.ad-rail .ad-placeholder{min-height:600px}.app{display:flex;flex-direction:column;height:100vh;background-color:#f5f5f5}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 2px 8px #0000001a}.app-header h1{font-size:1.5rem;margin:0}.header-controls{display:flex;gap:1rem}.btn-primary,.btn-secondary,.btn-danger{padding:.5rem 1rem;border-radius:4px;font-weight:500;transition:all .2s ease}.btn-primary{background-color:#4caf50;color:#fff}.btn-primary:hover:not(:disabled){background-color:#45a049}.btn-secondary{background-color:#2196f3;color:#fff}.btn-secondary:hover:not(:disabled){background-color:#0b7dda}.btn-danger{background-color:#f44336;color:#fff}.btn-danger:hover:not(:disabled){background-color:#da190b}.btn-primary:disabled,.btn-secondary:disabled,.btn-danger:disabled{opacity:.5;cursor:not-allowed}.app-main{display:flex;flex:1;gap:2rem;padding:2rem;overflow:hidden}.board-container{flex:1;display:flex;justify-content:center;align-items:center;background:#fff;border-radius:8px;box-shadow:0 2px 8px #0000001a;min-width:0;min-height:0}.loading{display:flex;align-items:center;justify-content:center;width:100%;height:100%;font-size:1.2rem;color:#666}.sidebar{width:300px;background:#fff;border-radius:8px;padding:1.5rem;box-shadow:0 2px 8px #0000001a;overflow-y:auto;min-height:0}.sidebar{width:300px;display:flex;flex-direction:column;gap:1rem;overflow-y:auto}@media (max-width: 1024px){.app-main{gap:1.5rem;padding:1.5rem}.sidebar{width:250px}}@media (max-width: 768px){.app{height:100vh}.app-header{flex-direction:column;gap:.75rem;padding:.75rem}.app-header h1{font-size:1.2rem}.header-controls{width:100%;justify-content:space-around;gap:.5rem}.btn-primary,.btn-secondary,.btn-danger{padding:.6rem .8rem;font-size:.9rem;flex:1}.app-main{flex-direction:column;gap:1rem;padding:1rem;overflow-y:auto}.board-container{order:1;aspect-ratio:1;width:100%;flex-shrink:0;min-height:auto;max-height:none}.sidebar{width:100%;order:2;flex-shrink:0}}@media (max-width: 480px){.app-header{padding:.5rem;gap:.5rem}.app-header h1{font-size:1rem}.btn-primary,.btn-secondary,.btn-danger{padding:.5rem;font-size:.8rem}.app-main{padding:.75rem;gap:.75rem}.sidebar{width:100%}}.header-user{align-self:center;font-weight:600;max-width:10rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.btn-logout{background-color:#fff3}@media (max-width: 768px){.header-user{flex-basis:100%;text-align:center;max-width:none}.header-controls{flex-wrap:wrap}}.header-home,.header-user{color:inherit;text-decoration:none}.static-board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);aspect-ratio:1;width:100%;border-radius:6px;overflow:hidden;box-shadow:0 6px 20px #0000002e;container-type:inline-size}.sb-sq{position:relative;display:flex;align-items:center;justify-content:center}.sb-sq.light{background:#f0d9b5}.sb-sq.dark{background:#b58863}.sb-sq.hl{box-shadow:inset 0 0 0 100px #ffeb3b73}.sb-piece{font-size:9.5cqw;line-height:1;-webkit-user-select:none;user-select:none}.sb-piece.white{color:#fff;text-shadow:0 0 2px #000,0 1px 2px rgba(0,0,0,.7)}.sb-piece.black{color:#111;text-shadow:0 1px 1px rgba(255,255,255,.35)}.sb-dot{position:absolute;width:30%;height:30%;border-radius:50%;background:#204a8773}.sb-dot.capture{width:86%;height:86%;background:transparent;border:4px solid rgba(32,74,135,.45)}.home-hero{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.home-hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:2.5rem;align-items:center;padding-top:3.5rem;padding-bottom:3.5rem}.home-hero h1{font-size:2.6rem;line-height:1.15;margin-bottom:1rem}.home-hero p{font-size:1.1rem;opacity:.95}.home-cta{display:flex;flex-wrap:wrap;gap:.8rem;margin:1.6rem 0 1rem}.home-note{font-size:.95rem!important;opacity:.85!important}.home-hero-board{max-width:460px;width:100%;justify-self:center}.home-h2{font-size:1.7rem;text-align:center;margin-bottom:1.6rem}.home-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.home-feature h3,.home-learn h3{font-size:1.1rem;margin:.4rem 0}.home-feature p,.home-learn p{color:var(--muted);font-size:.97rem}.home-icon{font-size:1.8rem}.home-band{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.home-steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.home-steps li h3{margin:.6rem 0 .3rem}.home-steps li p{color:var(--muted)}.home-step-n{display:inline-flex;width:2.2rem;height:2.2rem;align-items:center;justify-content:center;border-radius:50%;background:var(--brand);color:#fff;font-weight:700}.site a.home-learn{color:inherit;text-decoration:none;transition:transform .15s,box-shadow .15s}.site a.home-learn:hover{transform:translateY(-2px);box-shadow:0 6px 16px #3c468c26}.home-more{color:var(--brand-dark);font-weight:600}.home-final{background:#1f2430;color:#fff;text-align:center}.home-final .container{padding-top:3rem;padding-bottom:3rem}.home-final h2{font-size:1.8rem;margin-bottom:.4rem}.home-final p{color:#c9cdd8;margin-bottom:1.4rem}@media (max-width: 860px){.home-hero-inner{grid-template-columns:1fr;padding-top:2.2rem;padding-bottom:2.2rem}.home-hero h1{font-size:2rem}.home-hero-board{order:-1;max-width:340px}.home-grid,.home-grid.three,.home-steps{grid-template-columns:1fr}}@media (min-width: 861px) and (max-width: 1000px){.home-grid{grid-template-columns:repeat(2,1fr)}}.rules-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin:1rem 0 1.4rem}.rules-fig{display:flex;gap:1rem;align-items:flex-start;margin:0}.rules-board{flex:0 0 168px;width:168px}.rules-board.small{flex-basis:220px;width:220px}.rules-fig h3{margin-top:0}.rules-fig p{margin-bottom:0;font-size:.95rem;color:var(--muted)}.rules-start{display:flex;gap:1.4rem;align-items:center}.rules-start ul{margin:0}.rules-table{border-collapse:collapse;background:#fff;border:1px solid var(--line);margin-bottom:1rem}.rules-table th,.rules-table td{padding:.5rem 1.2rem;border-bottom:1px solid var(--line);text-align:left}.prose code{background:#eceef6;padding:.1rem .4rem;border-radius:4px;font-size:.92em}@media (max-width: 860px){.rules-grid{grid-template-columns:1fr}.rules-start{flex-direction:column;align-items:stretch}.rules-board.small{width:100%;max-width:280px;flex-basis:auto;align-self:center}}@media (max-width: 460px){.rules-fig{flex-direction:column}.rules-board{width:100%;max-width:240px;flex-basis:auto;align-self:center}}.faq{display:flex;flex-direction:column;gap:.5rem}.faq-item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 1rem}.faq-item summary{cursor:pointer;padding:.85rem 0;font-weight:600}.faq-item[open] summary{border-bottom:1px solid var(--line)}.faq-answer{padding:.8rem 0 .2rem;color:var(--muted)}.openings-layout{display:grid;grid-template-columns:250px 1fr;gap:1.2rem;align-items:start}.openings-list{display:flex;flex-direction:column;gap:.4rem}.openings-item{display:flex;justify-content:space-between;align-items:center;gap:.5rem;text-align:left;padding:.65rem .85rem;background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--ink)}.openings-item:hover{border-color:var(--brand)}.openings-item.active{background:var(--brand);border-color:var(--brand);color:#fff}.openings-name{font-weight:600;font-size:.95rem}.openings-eco{font-size:.78rem;opacity:.75}.openings-detail{display:grid;grid-template-columns:minmax(240px,380px) 1fr;gap:1.5rem}.openings-controls{display:flex;justify-content:center;align-items:center;gap:.6rem;margin-top:.8rem}.openings-controls button{width:2.4rem;height:2.4rem;border-radius:8px;background:#eceef6;font-size:1rem}.openings-controls button:disabled{opacity:.4;cursor:not-allowed}.openings-controls span{min-width:3.2rem;text-align:center;font-variant-numeric:tabular-nums}.openings-info h2{font-size:1.4rem;margin-bottom:.3rem}.openings-tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.8rem}.openings-tags span{background:#eceef6;border-radius:999px;padding:.1rem .7rem;font-size:.82rem;color:var(--brand-dark)}.openings-moves{list-style:none;display:flex;flex-wrap:wrap;gap:.25rem;margin-bottom:.9rem}.openings-moves button{padding:.2rem .5rem;border-radius:6px;background:#f1f2f8;font-family:Courier New,monospace;font-size:.92rem}.openings-moves li.current button{background:var(--brand);color:#fff}.openings-info p{margin-bottom:.8rem}.openings-info dt{font-weight:700;margin-top:.4rem}.openings-info dd{color:var(--muted);margin:0 0 .6rem}@media (max-width: 960px){.openings-layout{grid-template-columns:1fr}.openings-list{flex-direction:row;overflow-x:auto;padding-bottom:.3rem}.openings-item{flex:0 0 auto}}@media (max-width: 720px){.openings-detail{grid-template-columns:1fr}.openings-board{max-width:380px;margin:0 auto;width:100%}}.puzzles-layout{display:grid;grid-template-columns:250px 1fr;gap:1.2rem;align-items:start}.puzzles-list{display:flex;flex-direction:column;gap:.4rem}.puzzles-item{display:grid;grid-template-columns:1.9rem 1fr;grid-template-areas:"check title" "check mate";column-gap:.7rem;text-align:left;padding:.55rem .8rem;background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--ink)}.puzzles-item.active{border-color:var(--brand);box-shadow:0 0 0 2px #5b6bd640}.puzzles-check{grid-area:check;align-self:center;width:1.9rem;height:1.9rem;border-radius:50%;background:#eceef6;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700}.puzzles-item.done .puzzles-check{background:#4caf50;color:#fff}.puzzles-title{grid-area:title;font-weight:600;font-size:.95rem}.puzzles-mate{grid-area:mate;font-size:.8rem;color:var(--muted)}.puzzle-play{display:grid;grid-template-columns:minmax(280px,560px) 1fr;gap:1.2rem;align-items:start}.puzzle-board{position:relative;width:100%;background:#fff;border-radius:10px;padding:.5rem;box-shadow:0 2px 8px #0000001a}.puzzle-board .board-2d-wrap,.puzzle-board .board-2d{max-width:none}.puzzle-panel h2{font-size:1.3rem;margin-bottom:.4rem}.puzzle-theme{color:var(--muted);margin:.3rem 0 .9rem}.puzzle-status{padding:.6rem .8rem;border-radius:8px;background:#eceef6;font-weight:600;margin-bottom:.8rem}.puzzle-status.wrong{background:#fdecea;color:#b71c1c}.puzzle-status.solved{background:#e8f5e9;color:#1b5e20}.puzzle-answer{margin-bottom:.8rem}.puzzle-actions{display:flex;flex-wrap:wrap;gap:.5rem}.puzzle-actions .site-btn:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 1000px){.puzzles-layout,.puzzle-play{grid-template-columns:1fr}.puzzles-list{flex-direction:row;overflow-x:auto;padding-bottom:.3rem}.puzzles-item{flex:0 0 auto;min-width:170px}}.settings-card{margin-bottom:1.2rem}.settings-card h2{font-size:1.15rem;margin-bottom:.4rem}.settings-row{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.8rem 0;border-top:1px solid var(--line)}.settings-row:first-of-type{border-top:none}.settings-row small{display:block;color:var(--muted)}.settings-row select{padding:.45rem .6rem;border:1px solid #ccc;border-radius:6px;background:#fff;font-size:.95rem;min-width:11rem}.settings-row input[type=checkbox]{width:1.3rem;height:1.3rem;accent-color:var(--brand)}@media (max-width: 520px){.settings-row select{min-width:8.5rem}}.profile-head{display:flex;gap:1rem;align-items:center;margin-bottom:1.2rem}.profile-head h2{font-size:1.4rem;line-height:1.2}.profile-head p{color:var(--muted)}.profile-avatar{width:3.6rem;height:3.6rem;border-radius:50%;background:var(--brand);color:#fff;font-size:1.6rem;font-weight:700;display:flex;align-items:center;justify-content:center}.profile-block{margin-bottom:1.2rem}.profile-block h2{font-size:1.15rem;margin-bottom:.6rem}.profile-stats{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem;margin-bottom:.8rem}.profile-stats div{background:#f1f2f8;border-radius:8px;padding:.6rem .4rem;text-align:center}.profile-stats strong{display:block;font-size:1.4rem}.profile-stats span{font-size:.8rem;color:var(--muted)}.profile-muted{color:var(--muted);margin-bottom:.8rem}.profile-actions,.profile-footer{display:flex;flex-wrap:wrap;gap:.6rem}.profile-block p{margin-bottom:.7rem}.site .site-btn.danger{color:#b71c1c;border-color:#e57373}.site-btn:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 520px){.profile-stats{grid-template-columns:repeat(3,1fr)}}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{width:100%;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5}button{cursor:pointer;border:none;background:none;font-family:inherit}input,textarea{font-family:inherit}