:root{--bg: #20262e;--panel: #1a2027;--panel-2: #232b34;--text: #e6edf3;--muted: #8b98a5;--light-sq: #c9d6c4;--dark-sq: #6f8f6a;--white-piece: #b5baba;--black-piece: #525252;--select: #f4d35e;--target: rgba(60, 200, 120, .55);--capture: rgba(230, 80, 80, .65);--lastmove: rgba(244, 211, 94, .28);--check: rgba(255, 70, 70, .55);--sq: 40px}*{box-sizing:border-box}body{margin:0;overflow-x:hidden;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}html{scrollbar-gutter:stable}.app{max-width:1100px;margin:0 auto;padding:16px}.app.app-play{max-width:1160px}.app-header h1{font-size:22px;margin:4px 0 12px}.subtitle{color:var(--muted);font-weight:400;font-size:15px}.layout{display:flex;gap:20px;align-items:flex-start;flex-wrap:wrap}.board-area{flex:0 0 auto}.sidebar{flex:1 1 240px;min-width:240px;background:var(--panel);border-radius:10px;padding:14px;position:relative;z-index:0}.status-banner{padding:8px 12px;border-radius:8px;margin-bottom:10px;font-weight:600;background:var(--panel-2)}.status-check{background:#3a2a1a;color:#ffcf8f}.status-over{background:#2a1a1a;color:#ff9b9b}.board{display:inline-block;background:var(--panel);padding:6px;border-radius:8px;user-select:none}.board-row{display:flex}.square{width:var(--sq);height:var(--sq);border:none;padding:0;position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:calc(var(--sq) * .7);line-height:1}.square.light{background:var(--light-sq)}.square.dark{background:var(--dark-sq)}.square.selected{outline:3px solid var(--select);outline-offset:-3px;z-index:2}.square.lastmove:after{content:"";position:absolute;inset:0;background:var(--lastmove);pointer-events:none}.square.incheck{box-shadow:inset 0 0 0 3px var(--check)}.target-dot{position:absolute;width:32%;height:32%;border-radius:50%;background:var(--target);pointer-events:none}.square.target-capture .target-dot{width:84%;height:84%;background:transparent;border:4px solid var(--capture);border-radius:50%}.coord{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:11px}.coord-rank{width:18px;height:var(--sq)}.coord-file{width:var(--sq);height:18px}.coord-corner{width:18px;height:18px}.piece{pointer-events:none;width:92%;height:92%;position:relative;display:block}.piece-img{width:100%;height:100%;display:block;filter:drop-shadow(0 1px 1px rgba(0,0,0,.4))}.piece-badge{position:absolute;right:2%;bottom:2%;min-width:38%;height:38%;padding:0 2px;box-sizing:border-box;display:flex;align-items:center;justify-content:center;font-size:calc(var(--sq) * .3);font-weight:800;line-height:1;color:#fff;background:#2f6f4f;border:1.5px solid #0b1216;border-radius:5px}.controls{display:flex;gap:8px;margin-bottom:10px}.btn{flex:1;background:var(--panel-2);color:var(--text);border:1px solid #313b46;border-radius:8px;padding:8px 10px;cursor:pointer;font-size:14px}.btn:hover:not(:disabled){background:#2c3640}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-ghost{background:transparent}.info-line{margin-bottom:10px;font-size:13px}.muted{color:var(--muted)}.movelist h2,.modal h2{font-size:15px;margin:6px 0}.movelist-rows{list-style:none;margin:0;padding:0;max-height:420px;overflow-y:auto}.movelist-row{display:grid;grid-template-columns:32px 1fr 1fr;gap:6px;padding:3px 4px;font-variant-numeric:tabular-nums;font-size:14px}.movelist-row:nth-child(odd){background:#ffffff08}.move-no{color:var(--muted)}.modal-backdrop{position:fixed;inset:0;background:#0000008c;display:flex;align-items:center;justify-content:center;z-index:50}.modal{background:var(--panel);border-radius:12px;padding:20px;max-width:420px;width:calc(100% - 32px)}.modal p{color:var(--muted);font-size:14px;margin-top:0}.promo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:12px 0}.promo-choice{display:flex;flex-direction:column;align-items:center;gap:4px;background:var(--panel-2);border:1px solid #313b46;border-radius:8px;padding:10px 4px;cursor:pointer;color:var(--text);font-size:30px}.promo-choice:hover{background:#2c3640}.promo-label{font-size:11px;color:var(--muted)}.controls-panel{margin-bottom:12px}.control-row{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px}.control-label{font-size:13px;color:var(--muted);flex:0 0 auto}.segmented{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}.seg{background:var(--panel-2);color:var(--text);border:1px solid #313b46;border-radius:6px;padding:5px 9px;font-size:12px;cursor:pointer}.seg:hover{background:#2c3640}.seg-on{background:#2f6f4f;border-color:#3c9c6c;color:#eafff3}.thinking{color:#ffcf8f;font-weight:600;margin-left:6px}.app-header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.view-toggle{justify-content:flex-start}.board3d{width:620px;max-width:100%;height:620px;background:#0f1419;border-radius:8px;overflow:hidden;position:relative}.board3d-hint{position:absolute;left:10px;bottom:8px;font-size:12px;pointer-events:none}.board3d-controls{position:absolute;left:10px;bottom:8px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;max-width:calc(100% - 20px)}.board3d-controls .seg{font-size:12px}.board3d-controls .board3d-hint{position:static}.color-settings{margin-top:12px;padding-top:10px;border-top:1px solid #232b34}.color-row{display:flex;align-items:center;gap:12px;margin-top:8px;flex-wrap:wrap}.color-field{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted)}.color-field input[type=color]{width:34px;height:28px;padding:0;border:1px solid #313b46;border-radius:6px;background:var(--panel-2);cursor:pointer}.color-reset{flex:0 0 auto;padding:6px 10px;font-size:13px}.play-header{display:flex;align-items:center;justify-content:flex-end;position:fixed;top:10px;right:12px;z-index:60}.app-play{padding-top:4px;--sq: clamp(34px, min(calc((100vh - 134px) / 14), calc((100vw - 520px) / 14)), 56px)}.play-header .play-tools{margin-right:8px}.play-header .play-back{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;margin:0;font-size:20px;border-radius:9px;background:var(--panel-2);border:1px solid #313b46;color:var(--text);text-decoration:none}.play-header .play-back:hover{background:#2c3640}.play-tools{display:flex;gap:8px;position:relative}.popover-wrap{position:relative}.icon-btn{width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border-radius:9px;background:var(--panel-2);border:1px solid #313b46;color:var(--text);cursor:pointer}.icon-btn:hover{background:#2c3640}.icon-btn-on{background:#2f6f4f;border-color:#3c9c6c;color:#eafff3}.popover-panel{position:absolute;top:46px;right:0;z-index:1000;min-width:240px;background:var(--panel);border:1px solid #313b46;border-radius:12px;padding:14px;box-shadow:0 10px 30px #00000073}.menu-title{font-size:13px;color:var(--muted);margin-bottom:8px}.menu-list{display:flex;flex-direction:column;gap:6px}.menu-item{text-align:left;background:var(--panel-2);color:var(--text);border:1px solid #313b46;border-radius:8px;padding:9px 12px;cursor:pointer;font-size:14px}.menu-item:hover{background:#2c3640}.menu-item-on{background:#2f6f4f;border-color:#3c9c6c;color:#eafff3}.game-notice-slot{height:32px;margin-bottom:6px}.app-play.is-3d .game-notice-slot{position:absolute;top:70px;left:50%;transform:translate(-50%);height:auto;margin:0;z-index:40}.game-notice{display:inline-block;padding:6px 12px;margin-bottom:0;border-radius:8px;font-weight:600;font-size:14px;background:#3a2a1a;color:#ffcf8f}.game-notice.notice-over{background:#2a1a1a;color:#ff9b9b}.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.card-head h2{margin:0}.card-min{width:26px;height:26px;display:inline-flex;align-items:center;justify-content:center;border-radius:7px;background:var(--panel-2);border:1px solid #313b46;color:var(--text);font-size:20px;line-height:1;cursor:pointer}.card-min:hover{background:#2c3640}.toolbox{display:flex;border:1px solid #3a4654;border-radius:10px;background:var(--panel-2);overflow:visible}.tool-slot{position:relative;display:flex}.tool-cell{width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;background:var(--panel-2);color:var(--text);border:none;border-left:1px solid #3a4654;cursor:pointer}.toolbox>.tool-cell:first-child,.toolbox>.tool-slot:first-child .tool-cell{border-left:none}.tool-cell:hover{background:#2c3640}.tool-cell-on{background:#11161c;color:var(--text)}.tool-cell-on:hover{background:#11161c}.toolbox>.tool-cell:first-child{border-top-left-radius:9px;border-bottom-left-radius:9px}.toolbox>.tool-slot:last-child .tool-cell{border-top-right-radius:9px;border-bottom-right-radius:9px}.view-dropdown{position:absolute;top:46px;left:0;z-index:1000;display:flex;flex-direction:column;width:40px;border:1px solid #3a4654;border-radius:10px;overflow:hidden;background:var(--panel);box-shadow:0 10px 26px #00000073}.view-cell{height:40px;display:flex;align-items:center;justify-content:center;background:var(--panel);color:var(--text);border:none;cursor:pointer;font-size:13px}.view-cell:hover{background:#2c3640}.view-cell-on{background:#0a0e12;color:var(--text)}.view-cell-on:hover{background:#0a0e12}.settings-dropdown{position:absolute;top:46px;right:0;z-index:1000;min-width:240px;background:var(--panel);border:1px solid #3a4654;border-radius:12px;padding:14px;box-shadow:0 10px 30px #00000073}.app-play.moves-collapsed{--sq: clamp(34px, min(calc((100vh - 134px) / 14), calc((100vw - 240px) / 14)), 76px)}.app-play.moves-collapsed .board3d{width:744px;height:744px}.app-play.is-3d{padding:0}.app-play.is-3d .layout{display:block}.app-play.is-3d .board-area{flex:none}.app-play.is-3d .board3d{position:relative;left:50%;margin-left:-50vw;width:100vw;max-width:100vw;height:100vh;border-radius:0}.app-play.is-3d .sidebar{position:fixed;top:64px;right:12px;width:240px;max-height:calc(100vh - 80px);overflow-y:auto;z-index:30}.piece-mask{width:92%;height:92%;display:block;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-position:center;mask-position:center;-webkit-mask-size:contain;mask-size:contain}.piece-stack{position:relative;width:92%;height:92%;display:block;filter:drop-shadow(0 1px 1px rgba(0,0,0,.3))}.piece-layer{position:absolute;inset:0;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-position:center;mask-position:center;-webkit-mask-size:contain;mask-size:contain}.history-bar{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:10px}.hist-btn{width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;font-size:20px;line-height:1;background:var(--panel-2);color:var(--text);border:1px solid #3a4654;border-radius:8px;cursor:pointer}.hist-btn:hover:not(:disabled){background:#2c3640}.hist-btn:disabled{opacity:.35;cursor:not-allowed}.hist-label{font-size:13px;color:var(--muted);min-width:130px;text-align:center}.hist-live{background:#2f6f4f;color:#eafff3;border:1px solid #3c9c6c;border-radius:8px;padding:6px 12px;font-size:13px;cursor:pointer}.hist-live:hover{background:#357f5a}.card-head-tools{display:flex;align-items:center;gap:6px}.movelist .hist-btn{width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;font-size:18px;line-height:1;background:var(--panel-2);color:var(--text);border:1px solid #3a4654;border-radius:6px;cursor:pointer}.movelist .hist-btn:hover:not(:disabled){background:#2c3640}.movelist .hist-btn:disabled{opacity:.35;cursor:not-allowed}.move-cell{padding:0 2px;border-radius:4px}.move-active{background:#2f6f4f;color:#eafff3}.square.premove:after{content:"";position:absolute;inset:0;background:#5096ff73;pointer-events:none}.board{position:relative}.arrow-layer{position:absolute;top:0;left:0;pointer-events:none;z-index:5}.drag-ghost{position:absolute;width:var(--sq);height:var(--sq);transform:translate(-50%,-50%);pointer-events:none;z-index:20;display:flex;align-items:center;justify-content:center}.sound-settings{margin-top:12px;padding-top:10px;border-top:1px solid #232b34}.sound-row{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text);cursor:pointer}.sound-row input{width:16px;height:16px;cursor:pointer}.theme-row{display:flex;gap:8px;margin:8px 0;flex-wrap:wrap}.theme-swatch{width:28px;height:28px;border-radius:6px;border:1px solid #3a4654;cursor:pointer;padding:0}.theme-swatch:hover{outline:2px solid var(--muted)}.board-wrap{position:relative;display:inline-block}.flip-btn{position:absolute;top:8px;right:-46px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--panel-2);color:var(--text);border:1px solid #3a4654;border-radius:8px;cursor:pointer;z-index:10}.flip-btn:hover{background:#2c3640}.board-2d-row{position:relative;display:inline-block}.capture-column{position:absolute;right:100%;top:0;bottom:0;margin-right:8px;display:flex;flex-direction:column;justify-content:space-between;pointer-events:none}.captured-tray{display:flex}.captured-grid{--cap: calc(var(--sq) * .55);display:grid;grid-auto-flow:column;grid-template-rows:repeat(5,var(--cap));direction:rtl}.captured-piece{width:var(--cap);height:var(--cap);display:flex;align-items:center;justify-content:center;margin-bottom:calc(var(--cap) * -.4)}.captured-piece:last-child{margin-bottom:0}.move-click{cursor:pointer}.move-click:hover{background:#ffffff14;border-radius:4px}.piece-slide{width:100%;height:100%;display:flex;align-items:center;justify-content:center;position:relative;z-index:5;animation:piece-slide-in .28s ease-out}@keyframes piece-slide-in{0%{transform:translate(var(--dx, 0),var(--dy, 0))}}.square.sliding{z-index:6}.board.hint-tile .target-dot{display:none}.board.hint-tile .square.target-move:before,.board.hint-tile .square.target-capture:before{content:"";position:absolute;inset:0;pointer-events:none}.board.hint-tile .square.target-move:before{background:var(--target)}.board.hint-tile .square.target-capture:before{background:var(--capture)}.control-row-hint .control-label{white-space:nowrap}.control-row-hint .segmented{flex-wrap:nowrap;flex-shrink:0}.control-row-hint .seg{padding:5px 8px}.capture-column{width:158px;gap:10px}.capture-stack{flex:1;display:flex;flex-direction:column;justify-content:center;gap:8px;pointer-events:none}.player-panel{pointer-events:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--panel);border:1px solid #232b34;border-radius:10px;padding:8px 10px}.player-panel.active{border-color:#3c9c6c;box-shadow:0 0 0 1px #3c9c6c}.player-id{display:flex;flex-direction:column;gap:2px;min-width:0}.player-name{font-weight:700;font-size:13px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.player-rating{font-size:11px;color:var(--muted)}.player-clock{font-variant-numeric:tabular-nums;font-weight:800;font-size:18px;color:var(--text);background:var(--panel-2);border-radius:8px;padding:4px 9px}.player-clock.low{color:#e05555}.player-panel.active .player-clock{background:#2f6f4f;color:#eafff3}.tool-cell{text-decoration:none}.toolbox>.tool-cell:first-child{border-left:none}.btn-small{padding:5px 12px;font-size:13px;border-radius:8px}.online-lobby-overlay{position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:20px;background:#0c1014b8;backdrop-filter:blur(3px)}.online-lobby{width:min(420px,100%);background:var(--panel);border:1px solid #2c3640;border-radius:16px;padding:26px 24px 20px;box-shadow:0 24px 60px #00000080;display:flex;flex-direction:column;gap:14px}.online-lobby-head h1{margin:0 0 6px;font-size:24px}.online-lobby-head p{margin:0;color:var(--muted);line-height:1.5;font-size:14px}.online-field{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}.online-field input,.online-code-input{background:var(--panel-2);border:1px solid #2c3640;border-radius:10px;color:var(--text);padding:10px 12px;font-size:15px;outline:none}.online-field input:focus,.online-code-input:focus{border-color:var(--white-piece)}.online-create{width:100%;padding:12px;font-size:15px}.online-or{display:flex;align-items:center;text-align:center;color:var(--muted);font-size:12px;gap:10px}.online-or:before,.online-or:after{content:"";flex:1;height:1px;background:#2c3640}.online-join{display:flex;gap:8px}.online-code-input{flex:1;text-transform:uppercase;letter-spacing:3px;font-weight:700;text-align:center}.online-error{background:#e6505024;border:1px solid rgba(230,80,80,.4);color:#ffb3b3;padding:8px 12px;border-radius:10px;font-size:13px}.online-back{color:var(--muted);text-decoration:none;font-size:13px;text-align:center;margin-top:2px}.online-back:hover{color:var(--text)}.online-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;background:var(--panel);border:1px solid #2c3640;border-radius:12px;padding:8px 12px;margin-bottom:10px;font-size:14px}.online-bar-ended{border-color:var(--select)}.online-bar-msg{color:var(--muted)}.online-bar-actions{display:flex;gap:8px;margin-left:auto;align-items:center;flex-wrap:wrap}.online-bar-result{font-weight:700;color:var(--text)}.online-bar-leave{color:var(--muted);text-decoration:none;margin-left:auto}.online-bar-leave:hover{color:var(--text)}.online-draw-prompt{color:var(--select);font-weight:600}.online-code-chip{display:inline-flex;align-items:center;gap:8px;background:var(--panel-2);border:1px solid #2c3640;border-radius:10px;padding:5px 10px;cursor:pointer;color:var(--text)}.online-code-chip:hover{border-color:var(--white-piece)}.online-code-label{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:1px}.online-code-value{font-weight:800;letter-spacing:2px;font-size:16px}.online-code-copy{color:var(--muted);font-size:11px}.online-dot{width:9px;height:9px;border-radius:50%;background:var(--muted);flex:none}.online-dot.on{background:#3ac878;box-shadow:0 0 0 3px #3ac87833}.online-dot.away{background:var(--select)}.online-dot.off{background:#e65050}.online-secondary{width:100%;padding:11px}.online-lobby-busy{align-items:center;text-align:center;gap:16px;padding:32px 24px}.online-lobby-busy h1{margin:0;font-size:22px}.online-lobby-busy p{margin:0;color:var(--muted);font-size:14px}.online-spinner{width:42px;height:42px;border-radius:50%;border:4px solid #2c3640;border-top-color:var(--white-piece);animation:online-spin .9s linear infinite}@keyframes online-spin{to{transform:rotate(360deg)}}.auth-box{display:flex;flex-direction:column;gap:12px}.auth-form{display:flex;flex-direction:column;gap:10px}.auth-title{margin:0;font-size:18px}.auth-note{margin:0;color:var(--muted);font-size:13px;line-height:1.5}.auth-google{width:100%;padding:11px;display:inline-flex;align-items:center;justify-content:center;gap:10px}.auth-switch{background:none;border:none;color:var(--muted);font-size:13px;cursor:pointer;padding:4px;text-decoration:underline;text-underline-offset:3px}.auth-switch:hover{color:var(--text)}.auth-account-row{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--panel-2);border:1px solid #2c3640;border-radius:10px;padding:9px 12px;font-size:14px}.auth-elo{color:var(--muted);font-size:13px}.lang-switcher{background:var(--panel-2);border:1px solid #2c3640;border-radius:8px;color:var(--text);padding:6px 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