:root{--font-primary: "Outfit", "Inter", -apple-system, sans-serif;--font-mono: "Fira Code", monospace;--color-bg-darkest: #070a13;--color-bg-darker: #0c101f;--color-bg-dark: #12182c;--color-glass-bg: rgba(18, 24, 44, .55);--color-glass-border: rgba(255, 255, 255, .08);--color-glass-highlight: rgba(255, 255, 255, .15);--color-primary: #3b82f6;--color-primary-glow: rgba(59, 130, 246, .45);--color-cyan: #06b6d4;--color-cyan-glow: rgba(6, 182, 212, .4);--color-amber: #f59e0b;--color-amber-glow: rgba(245, 158, 11, .4);--color-green: #10b981;--color-green-glow: rgba(16, 185, 129, .4);--color-red: #ef4444;--color-red-glow: rgba(239, 68, 68, .55);--color-text-bright: #f8fafc;--color-text-main: #cbd5e1;--color-text-muted: #64748b;--board-light: #e2e8f0;--board-dark: #475569;--board-glow: var(--color-cyan-glow);--radius-sm: 8px;--radius-md: 16px;--radius-lg: 24px;--shadow-premium: 0 20px 40px -15px rgba(0, 0, 0, .6);--transition-smooth: all .35s cubic-bezier(.25, .8, .25, 1)}.theme-obsidian{--board-light: #e2e8f0;--board-dark: #475569;--board-glow: var(--color-cyan-glow)}.theme-emerald{--board-light: #ececd7;--board-dark: #739552;--board-glow: var(--color-green-glow)}.theme-classic{--board-light: #f0d9b5;--board-dark: #b58863;--board-glow: var(--color-amber-glow)}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;padding:0;width:100%;height:100%;overflow:hidden;position:fixed;overscroll-behavior:none}body{font-family:var(--font-primary);background-color:var(--color-bg-darkest);color:var(--color-text-main);display:flex;justify-content:center;align-items:center}.glowing-bg{position:fixed;top:0;left:0;width:100%;height:100%;z-index:-1;overflow:hidden;background:radial-gradient(circle at 50% 50%,#0d1226 0%,var(--color-bg-darkest) 100%)}.orb{position:absolute;border-radius:50%;filter:blur(100px);opacity:.18;mix-blend-mode:screen;animation:orb-float 20s infinite ease-in-out alternate}.orb-1{top:-10%;left:-10%;width:50vw;height:50vw;background:radial-gradient(circle,var(--color-primary) 0%,transparent 70%)}.orb-2{bottom:-10%;right:-10%;width:60vw;height:60vw;background:radial-gradient(circle,var(--color-cyan) 0%,transparent 70%);animation-delay:-5s}.orb-3{top:40%;left:60%;width:40vw;height:40vw;background:radial-gradient(circle,var(--color-amber) 0%,transparent 70%);animation-delay:-10s}@keyframes orb-float{0%{transform:translate(0) scale(1)}to{transform:translate(8%,10%) scale(1.15)}}.glass-card{background:var(--color-glass-bg);backdrop-filter:blur(12px) saturate(160%);-webkit-backdrop-filter:blur(12px) saturate(160%);border:1px solid var(--color-glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-premium);padding:2.5rem;position:relative;overflow:hidden;z-index:10}.card-glow{position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.03) 0%,transparent 60%);pointer-events:none;z-index:-1}.btn{font-family:var(--font-primary);font-weight:600;font-size:1rem;padding:.85rem 1.75rem;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;transition:var(--transition-smooth);-webkit-user-select:none;user-select:none}.btn-primary{background:linear-gradient(135deg,var(--color-primary) 0%,#1e40af 100%);color:var(--color-text-bright);box-shadow:0 4px 20px -5px #3b82f666}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px -3px #3b82f68c;background:linear-gradient(135deg,#4f46e5,#1d4ed8)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:#ffffff0d;border:1px solid var(--color-glass-border);color:var(--color-text-main)}.btn-secondary:hover{background:#ffffff1a;color:var(--color-text-bright);border-color:var(--color-glass-highlight);transform:translateY(-1px)}.btn-danger{background:linear-gradient(135deg,var(--color-red) 0%,#991b1b 100%);color:var(--color-text-bright)}.btn-danger:hover{background:linear-gradient(135deg,#dc2626,#b91c1c);transform:translateY(-1px)}.btn-block{width:100%}.btn-sm{padding:.5rem 1rem;font-size:.875rem;border-radius:var(--radius-sm)}.btn-icon-only{background:none;border:none;cursor:pointer;color:var(--color-text-muted);transition:var(--transition-smooth)}.btn-icon-only:hover{color:var(--color-text-bright)}.app-container{width:100%;height:100dvh;max-height:100dvh;max-width:1440px;padding:1rem;display:flex;justify-content:center;align-items:center;position:relative;overflow:hidden}.screen{display:none;width:100%;height:100%;justify-content:center;align-items:center;opacity:0;transition:opacity .4s ease;overflow-y:auto}.screen.active{display:flex;opacity:1}#screen-game{overflow:hidden}.welcome-card{width:100%;max-width:520px;text-align:center}.brand-header{font-size:2.2rem;font-weight:800;margin-bottom:1.5rem;letter-spacing:-.5px}.brand-bracket{color:var(--color-cyan)}.brand-text{background:linear-gradient(to right,var(--color-cyan) 0%,var(--color-primary) 50%,var(--color-amber) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.welcome-title{font-size:1.5rem;font-weight:600;color:var(--color-text-bright);margin-bottom:.75rem}.welcome-desc{font-size:.95rem;color:var(--color-text-muted);margin-bottom:2rem;line-height:1.5}.input-group{position:relative;width:100%;margin-bottom:1.5rem}.input-icon{position:absolute;left:1.25rem;top:50%;transform:translateY(-50%);color:var(--color-text-muted);font-size:1.1rem}.input-group input{width:100%;background:#00000040;border:1px solid var(--color-glass-border);border-radius:var(--radius-md);padding:1rem 1rem 1rem 3rem;font-size:1.05rem;color:var(--color-text-bright);font-family:var(--font-primary);outline:none;transition:var(--transition-smooth)}.input-group input:focus{border-color:var(--color-cyan);box-shadow:0 0 15px -3px var(--color-cyan-glow);background:#0006}.invite-banner{display:flex;align-items:center;gap:.75rem;background:#10b98126;border:1px solid var(--color-green-glow);color:var(--color-green);border-radius:var(--radius-md);padding:.85rem 1.25rem;margin-bottom:1.5rem;text-align:left;font-size:.92rem;line-height:1.4}.invite-icon{font-size:1.3rem}.modes-card{width:100%;max-width:900px}.user-profile-header{display:flex;justify-content:space-between;align-items:center;padding-bottom:1rem;border-bottom:1px solid var(--color-glass-border);margin-bottom:2rem}.user-greeting{font-size:1.1rem}.btn-change-name{background:none;border:none;color:var(--color-text-muted);cursor:pointer;transition:var(--transition-smooth)}.btn-change-name:hover{color:var(--color-cyan)}.section-title{font-size:1.8rem;font-weight:700;color:var(--color-text-bright);margin-bottom:1.5rem;text-align:center;letter-spacing:-.5px}.modes-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}.mode-card{background:#ffffff05;border:1px solid var(--color-glass-border);border-radius:var(--radius-md);padding:2rem 1.5rem;cursor:pointer;text-align:center;position:relative;transition:var(--transition-smooth);display:flex;flex-direction:column;align-items:center;justify-content:space-between}.mode-card:hover{background:#ffffff0d;border-color:var(--color-cyan);transform:translateY(-5px);box-shadow:0 10px 25px -10px var(--color-cyan-glow)}.mode-icon{font-size:2.8rem;margin-bottom:1.25rem;transition:var(--transition-smooth)}.mode-card:hover .mode-icon{transform:scale(1.1)}.mode-title{font-size:1.25rem;font-weight:600;color:var(--color-text-bright);margin-bottom:.75rem}.mode-desc{font-size:.85rem;color:var(--color-text-muted);line-height:1.5;margin-bottom:1.5rem}.mode-badge{background:#ffffff0f;border:1px solid var(--color-glass-border);padding:.25rem .75rem;border-radius:50px;font-size:.75rem;font-weight:600;color:var(--color-text-muted)}.mode-card:hover .mode-badge{color:var(--color-text-bright);border-color:#fff3}.highlight-badge{background:#10b9811a;color:var(--color-green);border-color:var(--color-green-glow)}.mode-card:hover .highlight-badge{background:var(--color-green);color:var(--color-bg-darkest)}.online-card{width:100%;max-width:600px}.back-nav{margin-bottom:1.5rem}.btn-back{display:flex;align-items:center;gap:.5rem;font-size:.95rem}.section-desc{text-align:center;font-size:.95rem;color:var(--color-text-muted);margin-bottom:2rem}.online-actions{display:flex;flex-direction:column;gap:1.5rem}.online-box{background:#ffffff05;border:1px solid var(--color-glass-border);border-radius:var(--radius-md);padding:1.75rem;transition:var(--transition-smooth)}.box-title{font-size:1.15rem;font-weight:600;color:var(--color-text-bright);margin-bottom:.5rem;display:flex;align-items:center;gap:.5rem}.box-desc{font-size:.88rem;color:var(--color-text-muted);margin-bottom:1.5rem;line-height:1.4}.lobby-waiting{display:flex;flex-direction:column;align-items:center;text-align:center;background:#0003;border:1px solid var(--color-glass-border);border-radius:var(--radius-md);padding:2rem;width:100%;transition:var(--transition-smooth)}.waiting-animation{margin-bottom:1.5rem}.spinner{display:inline-block;width:40px;height:40px;border:3px solid rgba(6,182,212,.15);border-radius:50%;border-top-color:var(--color-cyan);animation:spin 1s linear infinite}.lobby-waiting h3{font-size:1.3rem;font-weight:600;color:var(--color-text-bright);margin-bottom:.5rem}.lobby-waiting p{font-size:.9rem;color:var(--color-text-muted);margin-bottom:1.25rem}.invite-link-wrapper{display:flex;width:100%;max-width:440px;background:#0000004d;border:1px solid var(--color-glass-border);border-radius:var(--radius-md);overflow:hidden;margin-bottom:1.25rem}.invite-link-wrapper input{flex-grow:1;background:none;border:none;padding:.75rem 1rem;color:var(--color-text-bright);font-size:.9rem;font-family:var(--font-primary);outline:none}.invite-link-wrapper 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var(--color-cyan-glow)}.player-info{display:flex;align-items:center;gap:.75rem}.avatar{width:38px;height:38px;border-radius:50%;background:#ffffff0d;border:1px solid var(--color-glass-border);display:flex;justify-content:center;align-items:center;font-size:1.1rem;color:var(--color-text-muted)}.active-turn-glow .avatar{border-color:var(--color-cyan);color:var(--color-cyan)}.player-details{display:flex;flex-direction:column}.player-name{font-weight:600;color:var(--color-text-bright);font-size:.95rem}.player-role{font-size:.75rem;color:var(--color-text-muted)}.turn-indicator{position:absolute;left:0;top:0;height:100%;width:3px;background:transparent;transition:var(--transition-smooth)}.player-panel.active-turn-glow .turn-indicator{background:var(--color-cyan);box-shadow:0 0 10px var(--color-cyan)}.panel-stats{display:flex;align-items:center;gap:1rem}.captured-box{display:flex;align-items:center;gap:2px;min-height:24px}.captured-piece{width:18px;height:18px;object-fit:contain;opacity:.7}.material-advantage{font-size:.8rem;font-weight:700;color:var(--color-green);background:#10b9811a;padding:.15rem .4rem;border-radius:4px;display:none}.chessboard-wrapper{width:100%;max-width:580px;display:flex;justify-content:center;align-items:center}.chessboard-border{position:relative;width:100%;aspect-ratio:1;background:var(--color-bg-dark);border:3px solid rgba(255,255,255,.05);border-radius:var(--radius-md);box-shadow:0 25px 50px -12px #000000b3;padding:1.25rem}.board-coordinates{position:absolute;display:flex;color:var(--color-text-muted);font-size:.75rem;font-weight:700}.file-labels{left:1.25rem;right:1.25rem;width:calc(100% - 2.5rem);justify-content:space-around}.file-labels.top{top:.25rem}.file-labels.bottom{bottom:.25rem}.rank-labels{top:1.25rem;bottom:1.25rem;height:calc(100% - 2.5rem);flex-direction:column;justify-content:space-around;align-items:center}.rank-labels.left{left:.25rem}.rank-labels.right{right:.25rem}.chessboard{display:grid;grid-template-columns:repeat(15,1fr);grid-template-rows:repeat(15,1fr);width:100%;height:100%;border-radius:4px;overflow:hidden;-webkit-user-select:none;user-select:none}.square{position:relative;width:100%;height:100%;display:flex;justify-content:center;align-items:center;transition:background-color .15s ease}.square.solid{background-color:var(--color-glass-bg)}.square.highlight-selected{background-color:#06b6d440;box-shadow:inset 0 0 0 2px var(--color-cyan)}.square.highlight-last-move{background-color:#f59e0b38}.square.highlight-check{background-color:#ef444473;animation:check-flash 1.2s infinite alternate ease-in-out}@keyframes 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var(--color-glass-border);padding-bottom:.75rem;margin-bottom:.75rem}.widget-header h3{font-size:1rem;font-weight:600;color:var(--color-text-bright);display:flex;align-items:center;gap:.5rem}.theme-select-wrapper select{background:#00000040;border:1px solid var(--color-glass-border);color:var(--color-text-main);padding:.25rem .5rem;border-radius:var(--radius-sm);font-size:.82rem;outline:none;font-family:var(--font-primary);cursor:pointer;transition:var(--transition-smooth)}.theme-select-wrapper select:focus{border-color:var(--color-cyan)}.status-message{font-size:.9rem;color:var(--color-text-main);background:#06b6d40d;border-left:2.5px solid var(--color-cyan);padding:.65rem .85rem;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin-bottom:1rem;line-height:1.4;min-height:48px}.control-actions{display:flex;flex-direction:column;gap:.75rem}.toggle-control{margin-top:.5rem;padding:.5rem 0}.switch-container{display:flex;align-items:center;gap:.75rem;cursor:pointer;font-size:.88rem;color:var(--color-text-muted);-webkit-user-select:none;user-select:none}.switch-container input{display:none}.slider-toggle{position:relative;width:36px;height:20px;background-color:#ffffff1a;border-radius:20px;border:1px solid var(--color-glass-border);transition:var(--transition-smooth)}.slider-toggle:before{content:"";position:absolute;left:2px;top:2px;width:14px;height:14px;border-radius:50%;background-color:var(--color-text-muted);transition:var(--transition-smooth)}.switch-container input:checked+.slider-toggle{background-color:var(--color-cyan);border-color:var(--color-cyan)}.switch-container input:checked+.slider-toggle:before{transform:translate(16px);background-color:var(--color-text-bright)}.switch-container input:checked~.switch-label{color:var(--color-text-bright)}.move-history-container{height:140px;overflow-y:auto;font-size:.88rem;color:var(--color-text-muted);display:grid;grid-template-columns:40px 1fr 1fr;grid-auto-rows:28px;gap:2px;align-content:start;padding-right:5px}.move-history-container::-webkit-scrollbar{width:4px}.move-history-container::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:50px}.empty-history{grid-column:1 / -1;display:flex;justify-content:center;align-items:center;height:100%;font-style:italic;color:var(--color-text-muted)}.history-row-num{color:var(--color-text-muted);font-family:var(--font-mono);display:flex;align-items:center;font-weight:500}.history-move-cell{color:var(--color-text-main);display:flex;align-items:center;padding:0 4px;border-radius:4px;cursor:pointer;font-family:var(--font-mono)}.history-move-cell:hover{background:#ffffff0d;color:var(--color-text-bright)}#widget-chat{height:220px}.chat-messages-container{flex-grow:1;overflow-y:auto;padding-right:5px;display:flex;flex-direction:column;gap:.5rem;font-size:.88rem;margin-bottom:.75rem}.chat-messages-container::-webkit-scrollbar{width:4px}.chat-messages-container::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:50px}.chat-msg{line-height:1.4;word-break:break-word}.chat-msg .sender-name{font-weight:700;color:var(--color-cyan)}.chat-msg.self .sender-name{color:var(--color-primary)}.chat-system-msg{color:var(--color-text-muted);font-style:italic;font-size:.82rem}.chat-input-row{display:flex;gap:.5rem}.chat-input-row input{flex-grow:1;background:#0003;border:1px solid var(--color-glass-border);border-radius:var(--radius-sm);padding:.5rem 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button{flex-grow:1}.rematch-waiting{display:flex;align-items:center;justify-content:center;gap:.5rem;font-size:.88rem;color:var(--color-cyan);margin-bottom:1.25rem}.spinner-sm{display:inline-block;width:16px;height:16px;border:2px solid rgba(6,182,212,.15);border-radius:50%;border-top-color:var(--color-cyan);animation:spin .8s linear infinite}.toast-container{position:fixed;bottom:2rem;right:2rem;display:flex;flex-direction:column;gap:.75rem;z-index:110}.toast{background:#12182cd9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid var(--color-glass-border);box-shadow:var(--shadow-premium);padding:1rem 1.5rem;border-radius:var(--radius-md);color:var(--color-text-bright);font-size:.92rem;display:flex;align-items:center;gap:.75rem;transform:translateY(20px);opacity:0;transition:all .35s cubic-bezier(.175,.885,.32,1.275)}.toast.show{transform:translateY(0);opacity:1}.toast-info i{color:var(--color-cyan)}.toast-success i{color:var(--color-green)}.toast-warning i{color:var(--color-amber)}.toast-error i{color:var(--color-red)}.hidden{display:none!important}.mt-3{margin-top:1rem!important}@keyframes spin{to{transform:rotate(360deg)}}.animate-float{animation:float 6s infinite ease-in-out}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}.animate-scale-in{animation:scaleIn .35s cubic-bezier(.34,1.56,.64,1) forwards}@keyframes scaleIn{0%{transform:scale(.92);opacity:0}to{transform:scale(1);opacity:1}}.player-timer{font-family:var(--font-mono);font-size:.95rem;font-weight:600;color:var(--color-cyan);background:#00000059;border:1px solid var(--color-glass-border);padding:.3rem .65rem;border-radius:var(--radius-sm);margin-left:1rem;box-shadow:inset 0 0 5px #0003;letter-spacing:.5px;display:inline-flex;align-items:center;transition:var(--transition-smooth)}.player-timer.danger-time{color:var(--color-red);border-color:var(--color-red-glow);box-shadow:0 0 10px #ef444440;animation:time-pulse 1s infinite alternate ease-in-out}@keyframes time-pulse{0%{opacity:.8;transform:scale(1)}to{opacity:1;transform:scale(1.03)}}.time-presets-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;margin-top:.5rem}.time-preset-btn{background:#ffffff05;border:1px solid var(--color-glass-border);border-radius:var(--radius-sm);padding:.85rem .5rem;color:var(--color-text-bright);font-family:var(--font-primary);font-weight:600;font-size:.95rem;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.25rem;transition:var(--transition-smooth)}.time-preset-btn:hover{background:#ffffff0d;border-color:var(--color-cyan);transform:translateY(-2px)}.time-preset-btn.active{background:#06b6d41a;border-color:var(--color-cyan);box-shadow:0 0 12px var(--color-cyan-glow);color:var(--color-cyan)}.preset-sub{font-size:.72rem;font-weight:400;color:var(--color-text-muted)}.time-preset-btn.active 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landscape){.app-container{padding:.25rem}.modes-grid{grid-template-columns:repeat(3,1fr);gap:.75rem}.game-layout{display:grid;grid-template-columns:1fr;grid-template-rows:auto 1fr;height:100vh;height:100dvh;max-height:100vh;max-height:100dvh;overflow:hidden;gap:.5rem}.game-header{grid-column:1 / -1;flex-shrink:0;padding:.25rem .5rem;min-height:36px}@media (max-height: 500px){.game-header{display:none}}.playground{display:flex;flex-direction:column;justify-content:space-evenly;align-items:center;min-height:0;touch-action:none;gap:.25rem}.player-panel{width:100%;max-width:600px;padding:.35rem .75rem;flex-shrink:0;height:auto;min-height:38px}.avatar{width:clamp(24px,4dvh,34px);height:clamp(24px,4dvh,34px);font-size:clamp(.7rem,2dvh,1rem)}.player-name{font-size:clamp(.75rem,1.8dvh,.9rem)}.player-role{font-size:clamp(.6rem,1.4dvh,.75rem)}.player-timer{font-size:clamp(.75rem,1.8dvh,.95rem);padding:.2rem .4rem}.chessboard-wrapper{flex:1;width:100%;max-width:600px;min-height:0;display:flex;justify-content:center;align-items:center}.chessboard-border{--board-size: min( calc(100vw - 2rem) , calc(100vh - 150px) , calc(100dvh - 150px) , 600px);width:var(--board-size);height:var(--board-size);padding:1.5rem}.board-coordinates{font-size:.75rem}.file-labels{left:1.5rem;right:1.5rem;width:calc(100% - 3rem)}.rank-labels{top:1.5rem;bottom:1.5rem;height:calc(100% - 3rem)}.file-labels.top{top:.15rem}.file-labels.bottom{bottom:.15rem}.rank-labels.left{left:.15rem}.rank-labels.right{right:.15rem}.mobile-widget-tabs,.sidebar-widgets{display:none!important}.toast-container{left:auto;right:1rem;bottom:.5rem;max-width:300px}}@media screen and (max-width: 480px) and (orientation: portrait){.player-panel{padding:.4rem 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