*{box-sizing:border-box}
.ch-page{min-height:100vh;background:#f3f6fa;padding:18px;font-family:Arial,"Tahoma",sans-serif;color:#182230}
.ch-card{width:min(920px,100%);margin:0 auto;background:#fff;border:1px solid #e1e7ee;border-radius:22px;box-shadow:0 14px 36px rgba(30,50,70,.08);padding:18px}
.ch-header{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.ch-kicker{font-size:12px;color:#718096;margin-bottom:4px}
.ch-header h1{margin:0;font-size:25px}
.ch-header p{margin:8px 0 0;color:#657184;font-size:13px}
.ch-turn{min-width:125px;text-align:center;border:1px solid #d8e0e8;border-radius:999px;padding:10px 14px;font-weight:700;background:#f8fafc}
.ch-toolbar{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr auto;gap:10px;margin-top:16px}
.ch-toolbar>div,.ch-toolbar>label,.ch-btn{border:1px solid #d9e1ea;border-radius:10px;background:#fff;padding:9px 12px}
.ch-toolbar span{display:block;font-size:11px;color:#718096}
.ch-toolbar strong{display:block;margin-top:3px}
.ch-toolbar select{width:100%;border:0;background:transparent;font-weight:700;margin-top:3px;outline:none}
.ch-btn{cursor:pointer;font-weight:700;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}
.ch-btn:hover{background:#f7fafc}
.ch-btn:disabled{opacity:.55;cursor:not-allowed}
.ch-primary{background:#182230;color:#fff;border-color:#182230}.ch-primary:hover{background:#2b3645}
.ch-message{margin-top:14px;border:1px solid #dce4ed;background:#f8fafc;border-radius:10px;padding:11px;text-align:center;font-weight:700}
.ch-message.warning{border-color:#f2c979;background:#fff8e7;color:#8a5b00}
.ch-board-wrap{width:min(760px,100%);margin:18px auto 0}
.ch-files{display:grid;grid-template-columns:repeat(8,1fr);width:min(720px,calc(100% - 30px));margin:0 auto 5px;text-align:center;color:#718096;font-size:11px}
.ch-main-row{display:flex;gap:6px;align-items:stretch;justify-content:center}
.ch-ranks{width:24px;display:grid;grid-template-rows:repeat(8,1fr);align-items:center;text-align:center;color:#718096;font-size:11px}
.ch-board{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));width:min(720px,calc(100% - 30px));aspect-ratio:1/1;border:8px solid #9a6b3e;border-radius:12px;overflow:hidden;flex:1;box-shadow:0 14px 30px rgba(40,30,20,.16)}
.ch-square{position:relative;min-width:0;min-height:0;border:0;padding:0;display:grid;place-items:center;font-family:"Segoe UI Symbol","Noto Sans Symbols 2",serif;font-size:clamp(34px,6vw,64px);line-height:1;cursor:pointer}
.ch-square.light{background:#f3dfbb}.ch-square.dark{background:#b78962}.ch-square:hover{filter:brightness(1.06)}
.ch-square.selected{box-shadow:inset 0 0 0 4px rgba(255,215,0,.9)}
.ch-square.legal::after{content:"";position:absolute;width:18%;height:18%;border-radius:50%;background:rgba(24,120,70,.7)}
.ch-square.capture::after{content:"";position:absolute;inset:8%;border:4px solid rgba(180,35,35,.75);border-radius:50%}
.ch-square.check{box-shadow:inset 0 0 0 5px #d33b3b}
.ch-square.last{outline:3px solid rgba(255,220,80,.8);outline-offset:-3px}
.ch-piece.white{color:#fff;text-shadow:0 2px 2px #333,0 0 2px #333}.ch-piece.black{color:#111;text-shadow:0 1px 1px rgba(255,255,255,.4)}
.ch-help{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;font-size:12px;color:#667085;margin-top:10px}
.ch-mode-row{display:flex;justify-content:center;margin-top:12px}
.ch-overlay,.ch-promo{position:fixed;inset:0;background:rgba(15,23,42,.48);display:grid;place-items:center;padding:20px;z-index:20}.ch-overlay[hidden],.ch-promo[hidden]{display:none}
.ch-overlay-card,.ch-promo-card{width:min(430px,100%);background:#fff;border-radius:18px;padding:26px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.ch-result-icon{font-size:44px}.ch-overlay-card h2{margin:8px 0}.ch-overlay-card p{color:#667085}.ch-overlay-actions{display:flex;justify-content:center}
.ch-promo-options{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.ch-promo-options button{font-size:45px;padding:10px;border:1px solid #d9e1ea;border-radius:12px;background:#fff;cursor:pointer}.ch-promo-options button:hover{background:#f3f6fa}

.ch-online-shell{width:min(1120px,100%)}
.ch-online-toolbar{display:grid;grid-template-columns:2fr 1fr 1fr .7fr;gap:10px;margin-top:16px}
.ch-online-toolbar>div{border:1px solid #d9e1ea;border-radius:12px;background:#fff;padding:10px 12px}.ch-online-toolbar span{display:block;font-size:11px;color:#718096}.ch-online-toolbar strong{display:block;margin-top:4px}
.ch-online-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.ch-online-lobby{margin-top:14px;min-height:260px;border:1px solid #e1e7ee;border-radius:18px;background:#fbfcfe;display:grid;place-items:center;text-align:center;padding:30px}
.ch-online-lobby>*{grid-column:1}.ch-lobby-icon{font-size:50px}.ch-online-lobby h2{margin:4px 0}.ch-online-lobby p{margin:0;color:#667085;max-width:560px}.ch-queue-timer{margin-top:12px;font-size:32px;font-weight:800;color:#9a6b3e}
.ch-online-game{margin-top:16px;display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:14px;align-items:start}
.ch-online-board-area{border:1px solid #e1e7ee;border-radius:18px;background:#fbfcfe;padding:12px}
.ch-online-side{display:grid;gap:10px}.ch-player-box{border:1px solid #d9e1ea;border-radius:12px;background:#fff;padding:12px}.ch-player-box span{display:block;font-size:11px;color:#718096}.ch-player-box strong{display:block;margin-top:5px}.ch-player-box.yours{border-color:#dcc28d}.ch-player-box.opponent{border-color:#e8c5c5}
.ch-rule-note{border:1px dashed #d9e1ea;border-radius:12px;padding:12px;font-size:12px;color:#667085;background:#fff}
.ch-chat{grid-column:1/-1;border:1px solid #e1e7ee;border-radius:18px;background:#fff;padding:12px}.ch-chat-head{display:flex;justify-content:space-between;align-items:center}.ch-chat-head span{font-size:11px;color:#4b8b67}.ch-chat-messages{min-height:130px;max-height:230px;overflow:auto;margin-top:10px;display:grid;gap:7px}.ch-chat-message{display:grid;gap:2px;border:1px solid #e5e7eb;border-radius:10px;padding:8px 10px;max-width:78%;background:#f8fafc}.ch-chat-message.mine{margin-inline-start:auto;background:#fffaf0;border-color:#ecd79f}.ch-chat-message.theirs{margin-inline-end:auto}.ch-chat-message strong{font-size:12px}.ch-chat-message span{font-size:13px;white-space:pre-wrap;word-break:break-word}.ch-chat-form{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:10px}.ch-chat-form input{min-width:0;border:1px solid #d9e1ea;border-radius:10px;padding:10px;font:inherit;outline:none}.ch-chat-form input:focus{border-color:#b58a4b}
.ch-online-status.warning{color:#8a5b00}

@media(max-width:760px){
  .ch-page{padding:8px}.ch-card{padding:12px;border-radius:14px}.ch-header{flex-direction:column}.ch-header h1{font-size:21px}.ch-turn{align-self:stretch}
  .ch-toolbar{grid-template-columns:1fr 1fr}.ch-toolbar .ch-btn{grid-column:1/-1}
  .ch-board{border-width:5px;width:min(100%,calc(100% - 24px))}.ch-square{font-size:clamp(27px,10vw,46px)}.ch-board-wrap{overflow:visible}.ch-ranks{width:18px}.ch-files{width:calc(100% - 24px)}
  .ch-online-toolbar{grid-template-columns:1fr 1fr}.ch-online-game{grid-template-columns:1fr}.ch-online-side{grid-template-columns:1fr 1fr}.ch-rule-note{grid-column:1/-1}.ch-chat{grid-column:1}.ch-online-actions .ch-btn{flex:1 1 45%}
}