:root{
  --rch-bg:#0b1117;--rch-panel:#151f28;--rch-panel-2:#1c2a35;--rch-text:#f4f7f9;--rch-muted:#91a2ae;
  --rch-accent:#20d66b;--rch-accent-hover:#3ee77f;--rch-danger:#ef5b67;--rch-light:#e6e1d3;--rch-dark:#55706c;
  --rch-board-border:#26343f;--rch-radius:14px;--rch-shadow:0 18px 50px rgba(0,0,0,.34)
}
*{box-sizing:border-box}.reno-chess-play-page{overflow:hidden!important;background:var(--rch-bg)!important}.reno-chess-play-page .site-header,.reno-chess-play-page .site-footer,.reno-chess-play-page header.site-header,.reno-chess-play-page footer.site-footer,.reno-chess-play-page #masthead,.reno-chess-play-page #colophon{display:none!important}.reno-chess-play-page .site,.reno-chess-play-page .site-content,.reno-chess-play-page main,.reno-chess-play-page article,.reno-chess-play-page .entry-content{width:100%!important;max-width:none!important;margin:0!important;padding:0!important}.reno-chess-play-page .entry-title{display:none!important}
.rch-app,.rch-app button,.rch-app input,.rch-app select{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.rch-app{position:fixed;inset:0;z-index:99990;background:linear-gradient(145deg,var(--rch-bg),#101b24);color:var(--rch-text);overflow:auto;-webkit-tap-highlight-color:transparent}.rch-app button,.rch-app a,.rch-app input,.rch-app select{font-size:15px}.rch-app button{cursor:pointer}.rch-app [hidden]{display:none!important}
.rch-lobby{max-width:1120px;margin:auto;padding:clamp(18px,4vw,48px);min-height:100%;display:flex;flex-direction:column;justify-content:center}.rch-lobby-header{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px}.rch-lobby-header span{display:block;color:var(--rch-accent);font-weight:800;letter-spacing:.14em;font-size:12px}.rch-lobby-header h1{font-size:clamp(38px,7vw,72px);line-height:.95;margin:10px 0 12px;color:var(--rch-text)}.rch-lobby-header p{margin:0;color:var(--rch-muted);font-size:17px}.rch-header-actions{display:flex;gap:10px}.rch-header-actions a,.rch-mode-tabs button,.rch-public-section button{color:var(--rch-text);background:var(--rch-panel);border:1px solid rgba(255,255,255,.08);padding:10px 15px;border-radius:10px;text-decoration:none}.rch-mode-tabs{display:flex;gap:8px;margin-bottom:18px}.rch-mode-tabs button{font-weight:700}.rch-mode-tabs button.is-active{background:var(--rch-accent);color:#052112;border-color:transparent}.rch-mode-panel{display:none}.rch-mode-panel.is-active{display:block}.rch-online-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.rch-option-card,.rch-public-section{background:var(--rch-panel);border:1px solid rgba(255,255,255,.07);border-radius:var(--rch-radius);padding:22px;box-shadow:var(--rch-shadow)}.rch-mode-panel[data-mode-panel="ai"] .rch-option-card{max-width:520px}.rch-option-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:13px;background:rgba(32,214,107,.12);color:var(--rch-accent);font-size:28px}.rch-option-card h2{margin:16px 0 6px;font-size:23px}.rch-option-card p{color:var(--rch-muted);margin:0 0 18px}.rch-option-card label{display:block;color:var(--rch-muted);font-size:13px;margin-top:12px}.rch-option-card label small{float:right}.rch-option-card input,.rch-option-card select{width:100%;margin-top:7px;padding:12px 13px;border-radius:10px;border:1px solid rgba(255,255,255,.1);background:var(--rch-panel-2);color:var(--rch-text);outline:none}.rch-option-card input:focus,.rch-option-card select:focus{border-color:var(--rch-accent)}.rch-primary,.rch-secondary{width:100%;margin-top:16px;border:0;border-radius:10px;padding:13px 17px;font-weight:800}.rch-primary{background:var(--rch-accent);color:#052112}.rch-primary:hover{background:var(--rch-accent-hover)}.rch-secondary{background:#2c4050;color:var(--rch-text)}.rch-public-section{margin-top:16px}.rch-public-section>div:first-child{display:flex;justify-content:space-between;align-items:center}.rch-public-section h2{margin:0;font-size:19px}.rch-table-list{display:grid;gap:9px;margin-top:14px}.rch-table-row{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:14px;background:var(--rch-panel-2);padding:12px 14px;border-radius:10px}.rch-table-row strong{display:block}.rch-table-row small{color:var(--rch-muted)}.rch-table-row button{border:0;background:var(--rch-accent);color:#052112;border-radius:8px;padding:9px 14px;font-weight:800}.rch-empty{color:var(--rch-muted);padding:10px 0}.rch-lobby-stats,.rch-stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:16px}.rch-lobby-stats>div,.rch-stat-grid>div{background:var(--rch-panel);border:1px solid rgba(255,255,255,.06);border-radius:11px;padding:13px}.rch-lobby-stats span,.rch-stat-grid span{display:block;color:var(--rch-muted);font-size:12px}.rch-lobby-stats strong,.rch-stat-grid strong{font-size:22px}
.rch-game{min-height:100%;height:100%;display:flex;flex-direction:column}.rch-topbar{height:60px;min-height:60px;background:rgba(11,17,23,.96);border-bottom:1px solid rgba(255,255,255,.06);display:flex;align-items:center;padding:0 12px;gap:12px}.rch-icon-btn{width:40px;height:40px;border:0;border-radius:10px;background:var(--rch-panel);color:var(--rch-text);font-size:20px}.rch-game-title{flex:1}.rch-game-title strong{display:block;font-size:14px;letter-spacing:.08em}.rch-game-title small{color:var(--rch-muted);font-size:10px}.rch-top-actions{display:flex;gap:7px}.rch-game-main{flex:1;min-height:0;display:grid;grid-template-columns:minmax(340px,760px) minmax(230px,320px);justify-content:center;gap:18px;padding:16px}.rch-board-column{min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:8px}.rch-player-card{display:grid;grid-template-columns:auto minmax(120px,1fr) minmax(0,1fr) auto;align-items:center;gap:10px;background:var(--rch-panel);border:1px solid rgba(255,255,255,.06);border-radius:11px;padding:8px 10px}.rch-avatar{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:#2b3b47;font-weight:900}.rch-player-card strong{display:block}.rch-player-card small{display:block;color:var(--rch-muted);font-size:11px}.rch-player-card time{background:#0c1319;border-radius:9px;padding:8px 12px;font-size:21px;font-weight:900;font-variant-numeric:tabular-nums}.rch-player-card.is-turn{outline:2px solid var(--rch-accent)}.rch-player-card.is-turn time{background:var(--rch-accent);color:#052112}.rch-captured{overflow:hidden;white-space:nowrap;font-size:17px;letter-spacing:-3px;color:var(--rch-muted)}.rch-board-wrap{position:relative;min-height:0;display:grid;place-items:center}.rch-board{aspect-ratio:1;width:min(100%,calc(100vh - 190px));max-height:100%;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);border:8px solid var(--rch-board-border);border-radius:6px;box-shadow:var(--rch-shadow);overflow:hidden;touch-action:none;user-select:none}.rch-square{position:relative;border:0;padding:0;display:grid;place-items:center;font-size:clamp(28px,6.7vmin,64px);line-height:1;overflow:hidden}.rch-square.is-light{background:var(--rch-light)}.rch-square.is-dark{background:var(--rch-dark)}.rch-square.is-selected{box-shadow:inset 0 0 0 5px rgba(32,214,107,.75)}.rch-square.is-last{background-image:linear-gradient(rgba(255,214,68,.35),rgba(255,214,68,.35))}.rch-square.is-target:after{content:"";width:24%;height:24%;border-radius:50%;background:rgba(15,25,35,.32);position:absolute}.rch-square.is-capture:after{content:"";position:absolute;inset:5%;border:5px solid rgba(15,25,35,.3);border-radius:50%}.rch-piece{position:relative;z-index:2;filter:drop-shadow(0 2px 1px rgba(0,0,0,.28));transition:transform .12s ease}.rch-square:active .rch-piece{transform:scale(.9)}.rch-coord{position:absolute;font-size:9px;font-weight:900;opacity:.65;z-index:1}.rch-coord.file{right:3px;bottom:2px}.rch-coord.rank{left:3px;top:2px}.rch-board-status{position:absolute;left:50%;bottom:10px;transform:translateX(-50%);background:rgba(5,10,14,.88);border:1px solid rgba(255,255,255,.1);padding:7px 12px;border-radius:999px;font-size:12px;pointer-events:none}.rch-moving-piece{position:fixed;z-index:100100;display:grid;place-items:center;transition:transform .2s cubic-bezier(.2,.8,.2,1);pointer-events:none;font-size:54px}.rch-side{min-height:0;background:var(--rch-panel);border:1px solid rgba(255,255,255,.06);border-radius:var(--rch-radius);display:grid;grid-template-rows:auto auto minmax(0,1fr) auto;overflow:hidden}.rch-match-code{display:grid;grid-template-columns:auto 1fr auto;gap:9px;align-items:center;padding:13px;border-bottom:1px solid rgba(255,255,255,.06)}.rch-match-code span{font-size:10px;color:var(--rch-muted)}.rch-match-code strong{letter-spacing:.12em}.rch-match-code button{border:0;background:var(--rch-panel-2);color:var(--rch-text);border-radius:7px;padding:7px}.rch-move-head{display:flex;justify-content:space-between;align-items:center;padding:12px 13px}.rch-move-head h2{margin:0;font-size:16px}.rch-move-head span{color:var(--rch-accent);font-size:11px;font-weight:800}.rch-moves{overflow:auto;padding:0 13px 12px}.rch-move-row{display:grid;grid-template-columns:30px 1fr 1fr;gap:6px;padding:7px 0;border-bottom:1px solid rgba(255,255,255,.05)}.rch-move-row span:first-child{color:var(--rch-muted)}.rch-move-row b{font-weight:700}.rch-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:12px;border-top:1px solid rgba(255,255,255,.06)}.rch-actions button{border:0;background:var(--rch-panel-2);color:var(--rch-text);border-radius:9px;padding:11px;font-weight:700}.rch-actions button.is-danger{color:#ff9aa2;background:rgba(239,91,103,.12)}
.rch-toast{position:fixed;left:50%;bottom:25px;transform:translateX(-50%);z-index:100120;background:#070b0f;color:#fff;border:1px solid rgba(255,255,255,.12);padding:10px 15px;border-radius:10px;box-shadow:var(--rch-shadow)}.rch-modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.68);z-index:100090}.rch-modal{position:fixed;z-index:100100;left:50%;top:50%;transform:translate(-50%,-50%);width:min(92vw,420px);background:var(--rch-panel);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:24px;box-shadow:var(--rch-shadow);text-align:center}.rch-modal h2{margin:7px 0 10px;font-size:28px}.rch-modal p{color:var(--rch-muted)}.rch-promotion-options{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.rch-promotion-options button{aspect-ratio:1;border:0;border-radius:10px;background:var(--rch-panel-2);color:var(--rch-text);font-size:44px}.rch-result-actions{display:grid;gap:8px}.rch-result-actions a{display:block;padding:12px;color:var(--rch-text);text-decoration:none}.rch-drawer{position:fixed;z-index:100100;right:0;top:0;bottom:0;width:min(92vw,390px);background:var(--rch-panel);border-left:1px solid rgba(255,255,255,.1);padding:18px;overflow:auto;box-shadow:var(--rch-shadow)}.rch-drawer header{display:flex;justify-content:space-between;align-items:center}.rch-drawer header h2{margin:0}.rch-drawer header button{border:0;background:var(--rch-panel-2);color:var(--rch-text);width:38px;height:38px;border-radius:9px;font-size:22px}.rch-history-list{display:grid;gap:8px;margin-top:16px}.rch-history-item{background:var(--rch-panel-2);border-radius:9px;padding:11px}.rch-history-item strong{display:block}.rch-history-item small{color:var(--rch-muted)}
.rch-login{min-height:70vh;display:grid;place-items:center;background:var(--rch-bg);color:var(--rch-text);padding:30px}.rch-login>div{max-width:520px;text-align:center}.rch-login span,.rch-rules>span{color:var(--rch-accent);font-weight:900;letter-spacing:.12em}.rch-login h1{font-size:56px;margin:8px}.rch-login p{color:var(--rch-muted)}.rch-login a{display:inline-block;background:var(--rch-accent);color:#052112;text-decoration:none;font-weight:800;padding:12px 18px;border-radius:10px}.rch-rules{max-width:850px;margin:40px auto;padding:30px;color:#e9eff3;background:#111b23;border-radius:16px}.rch-rules h1{font-size:46px;margin:8px 0 20px}.rch-rules h2{margin-top:28px}.rch-rules p,.rch-rules li{color:#afbdc7;line-height:1.7}.rch-rules li{margin:8px 0}
@media(max-width:820px){.rch-lobby{padding:20px}.rch-lobby-header{align-items:flex-start;flex-direction:column}.rch-online-grid{grid-template-columns:1fr}.rch-game-main{grid-template-columns:1fr;padding:8px;gap:8px}.rch-side{display:none}.rch-board{width:min(100%,calc(100vh - 178px))}.rch-topbar{height:52px;min-height:52px}.rch-player-card{padding:5px 7px}.rch-player-card time{font-size:17px;padding:6px 9px}.rch-avatar{width:31px;height:31px}.rch-board-status{bottom:5px}.rch-lobby-stats{grid-template-columns:repeat(4,1fr)}}
@media(max-width:520px){.rch-header-actions{width:100%}.rch-header-actions a{flex:1;text-align:center}.rch-lobby-header h1{font-size:46px}.rch-mode-tabs button{flex:1}.rch-option-card{padding:17px}.rch-lobby-stats{grid-template-columns:repeat(2,1fr)}.rch-board{border-width:4px}.rch-square{font-size:11vw}.rch-top-actions{gap:3px}.rch-icon-btn{width:36px;height:36px}.rch-captured{display:none}.rch-player-card{grid-template-columns:auto 1fr auto}.rch-moving-piece{font-size:11vw}}
@media(orientation:landscape) and (max-height:620px){.rch-game-main{grid-template-columns:minmax(340px,calc(100vh - 104px)) minmax(210px,300px);padding:5px;gap:8px}.rch-board-column{gap:3px}.rch-board{width:calc(100vh - 118px);border-width:4px}.rch-player-card{padding:3px 6px}.rch-player-card time{font-size:15px;padding:4px 8px}.rch-avatar{width:28px;height:28px}.rch-topbar{height:46px;min-height:46px}.rch-icon-btn{height:34px;width:34px}.rch-board-status{bottom:3px}.rch-side{display:grid}}

.rch-settings-list{display:grid;gap:12px;margin-top:18px}.rch-setting-row,.rch-setting-range{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--rch-panel-2);border-radius:11px;padding:14px}.rch-setting-row span,.rch-setting-range span{display:grid;gap:3px}.rch-setting-row small{color:var(--rch-muted);font-size:11px}.rch-setting-row input[type=checkbox]{width:22px;height:22px;accent-color:var(--rch-accent)}.rch-setting-range{display:grid}.rch-setting-range span{display:flex;justify-content:space-between}.rch-setting-range output{color:var(--rch-accent);font-weight:800}.rch-setting-range input[type=range]{width:100%;accent-color:var(--rch-accent)}

/* v1.1: larger classic board and Bullet / Blitz / Rapid selectors */
:root{--rch-light:#eeeed2;--rch-dark:#769656;--rch-board-border:#292724}
.rch-mode-panel[data-mode-panel="ai"] .rch-option-card{max-width:760px}
.rch-time-title{margin-top:18px;color:var(--rch-text);font-size:14px;font-weight:800}
.rch-time-controls{display:grid;gap:15px;margin-top:10px}
.rch-time-group h3{display:flex;align-items:center;gap:7px;margin:0 0 8px;color:#f4f2ee;font-size:14px}
.rch-time-group h3 span{color:#a8d86e}
.rch-time-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.rch-time-option{display:block!important;margin:0!important;color:inherit!important}
.rch-time-option input{position:absolute;opacity:0;pointer-events:none}
.rch-time-option span{display:grid;place-items:center;min-height:44px;padding:9px 8px;border:1px solid rgba(255,255,255,.08);border-radius:8px;background:linear-gradient(#373533,#2d2b2a);color:#f5f5f5;font-weight:800;box-shadow:0 3px 8px rgba(0,0,0,.22);transition:border-color .14s,box-shadow .14s,transform .14s}
.rch-time-option input:checked+span{border-color:#8bc34a;box-shadow:0 0 0 2px rgba(139,195,74,.4),0 3px 8px rgba(0,0,0,.25);color:#fff}
.rch-time-option input:focus-visible+span{outline:2px solid var(--rch-accent);outline-offset:2px}
.rch-time-option span:active{transform:scale(.98)}
.rch-game-main{grid-template-columns:minmax(420px,860px) minmax(230px,320px);gap:14px;padding:10px}
.rch-board{width:min(100%,calc(100vh - 166px));border:5px solid var(--rch-board-border);border-radius:3px;box-shadow:0 14px 35px rgba(0,0,0,.42)}
.rch-square{font-size:clamp(42px,9.5vmin,94px)}
.rch-piece{display:grid;place-items:center;width:100%;height:100%;font-family:"DejaVu Sans","Noto Sans Symbols 2","Segoe UI Symbol","Arial Unicode MS",serif;font-size:.94em;font-weight:400;line-height:1;filter:drop-shadow(0 2px 1px rgba(0,0,0,.3));transform:scale(1.08);transform-origin:center}
.rch-piece[data-piece="P"],.rch-piece[data-piece="N"],.rch-piece[data-piece="B"],.rch-piece[data-piece="R"],.rch-piece[data-piece="Q"],.rch-piece[data-piece="K"]{color:#fafafa;text-shadow:-1px -1px 0 #3c3c3c,1px -1px 0 #3c3c3c,-1px 1px 0 #3c3c3c,1px 1px 0 #3c3c3c,0 2px 2px rgba(0,0,0,.22)}
.rch-piece[data-piece="p"],.rch-piece[data-piece="n"],.rch-piece[data-piece="b"],.rch-piece[data-piece="r"],.rch-piece[data-piece="q"],.rch-piece[data-piece="k"]{color:#4a4a4a;text-shadow:-1px -1px 0 #222,1px -1px 0 #222,-1px 1px 0 #222,1px 1px 0 #222,0 2px 2px rgba(0,0,0,.25)}
.rch-square:active .rch-piece{transform:scale(.98)}
.rch-coord{font-size:11px;opacity:.88;color:#f4f2c8;text-shadow:0 1px 1px rgba(0,0,0,.35)}
.rch-square.is-light .rch-coord{color:#769656;text-shadow:none}
.rch-moving-piece{font-family:"DejaVu Sans","Noto Sans Symbols 2","Segoe UI Symbol","Arial Unicode MS",serif;font-size:clamp(42px,9.5vmin,94px)}
@media(max-width:820px){.rch-game-main{grid-template-columns:1fr;padding:5px}.rch-board{width:min(100%,calc(100vh - 154px))}.rch-square{font-size:clamp(34px,11.3vw,80px)}}
@media(max-width:520px){.rch-time-grid{gap:6px}.rch-time-option span{min-height:42px;padding:8px 4px;font-size:13px}.rch-board{border-width:3px}.rch-square{font-size:11.8vw}.rch-piece{transform:scale(1.12)}.rch-moving-piece{font-size:11.8vw}}
@media(orientation:landscape) and (max-height:620px){.rch-game-main{grid-template-columns:minmax(360px,calc(100vh - 96px)) minmax(210px,300px);padding:4px}.rch-board{width:calc(100vh - 104px);border-width:3px}.rch-square{font-size:calc((100vh - 104px)/9)}.rch-piece{transform:scale(1.13)}.rch-moving-piece{font-size:calc((100vh - 104px)/9)}}
.rch-piece{width:94%;height:94%;object-fit:contain;font-size:0;transform:scale(1.03);filter:drop-shadow(0 2px 1px rgba(0,0,0,.28));pointer-events:none}
.rch-piece[data-piece]{color:initial;text-shadow:none}
.rch-square:active .rch-piece{transform:scale(.94)}
.rch-moving-piece{object-fit:contain;font-size:0;filter:drop-shadow(0 3px 2px rgba(0,0,0,.28))}
@media(max-width:520px){.rch-piece{width:98%;height:98%;transform:scale(1.06)}}