@property --ring-fill{syntax:"<number>";inherits:true;initial-value:.5}:root{--bg-primary:#06040a;--bg-secondary:#0c0a14;--bg-tertiary:#141020;--bg-elevated:#1c162c;--text-primary:#ece4f4;--text-secondary:#9890b0;--text-muted:#7a7194;--accent:#00e5ff;--accent-alt:#ff3a8c;--accent-hover:#33ebff;--accent-orange:#ff6a2b;--accent-gold:#fbbf24;--brand-gradient:linear-gradient(135deg, #ff3a8c, #ff6a2b);--brand-gradient-wide:linear-gradient(135deg, #ff3a8c, #ff6a2b, #fbbf24);--board-light:#1e2448;--board-dark:#0e1430;--piece-white:#f0f4ff;--piece-black:#000;--quantum-ring:#ff3a8c;--selection:#00e5ff;--legal-target:#22c55e;--split-first:#3b82f6;--split-second:#f59e0b;--merge-source-a:#8b5cf6;--merge-source-b:#ec4899;--merge-target:#eab308;--danger:#ef4444;--success:#22c55e;--warning:#f59e0b;--border:#ffffff0f;--border-light:#ffffff1a;--font-heading:"Chakra Petch", "Syne", sans-serif;--font-body:"Oxanium", "Outfit", sans-serif;--font-mono:"JetBrains Mono", monospace;--space-1:2px;--space-2:4px;--space-3:8px;--space-4:12px;--space-5:16px;--space-6:24px;--space-7:32px;--space-8:48px;--radius-sm:2px;--radius-md:4px;--radius-lg:8px;--radius-xl:12px;--radius-pill:999px;--duration-fast:.15s;--duration-normal:.2s;--duration-slow:.3s;--z-board:1;--z-piece:2;--z-topbar:10;--z-menu:50;--z-overlay:100;--z-toast:200;--z-modal:300;--z-drag-ghost:500;--board-chrome-h:180px;--board-chrome-w:340px;--board-square-radius:3px;--board-gap:var(--space-1);--clip-corner:polygon(12px 0%, 100% 0%, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0% 100%, 0% 12px);--clip-corner-sm:polygon(8px 0%, 100% 0%, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0% 100%, 0% 8px)}@keyframes fade-up{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes glow-breathe{0%,to{opacity:.4}50%{opacity:.7}}@keyframes shimmer{0%{background-position:-200%}to{background-position:200%}}@keyframes ring-pulse{0%,to{opacity:var(--ring-opacity,.75)}50%{opacity:calc(var(--ring-opacity,.75) * .5)}}@keyframes toast-in{0%{opacity:0;transform:translate(30px)scale(.95)}to{opacity:1;transform:translate(0)scale(1)}}@keyframes overlay-slide-up{0%{opacity:0;transform:translateY(100%)}to{opacity:1;transform:translateY(0)}}@keyframes hero-glow{0%,to{filter:blur(60px);background-position:0%}50%{filter:blur(80px);background-position:100%}}@keyframes stat-count{0%{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}@keyframes border-glow-pulse{0%,to{border-color:#00e5ff26}50%{border-color:#00e5ff4d}}@keyframes title-reveal{0%{opacity:0;letter-spacing:.5em;filter:blur(8px)}to{opacity:1;letter-spacing:.12em;filter:blur()}}@keyframes brand-gradient-flow{0%{background-position:0%}50%{background-position:100%}to{background-position:0%}}@keyframes star-twinkle{0%,to{opacity:.15}50%{opacity:.6}}@keyframes corner-accent-pulse{0%,to{opacity:.3}50%{opacity:.6}}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden}body{font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-weight:300;line-height:1.5}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(1.5px 1.5px at 12% 18%,#00e5ff59,#0000) 0 0/380px 320px,radial-gradient(1.2px 1.2px at 28% 65%,#ff3a8c4d,#0000) 0 0/320px 280px,radial-gradient(1.8px 1.8px at 45% 8%,#ff6a2b40,#0000) 0 0/420px 360px,radial-gradient(1px 1px at 62% 42%,#fff3,#0000) 0 0/280px 240px,radial-gradient(1.4px 1.4px at 78% 72%,#00e5ff33,#0000) 0 0/360px 300px,radial-gradient(1.2px 1.2px at 88% 25%,#ff3a8c33,#0000) 0 0/300px 260px,radial-gradient(1.6px 1.6px at 35% 88%,#ff6a2b2e,#0000) 0 0/260px 320px,radial-gradient(.9px .9px at 55% 52%,#c8b4ff26,#0000) 0 0/340px 300px,radial-gradient(1.3px 1.3px at 5% 78%,#ffffff26,#0000) 0 0/400px 340px,radial-gradient(1.7px 1.7px at 92% 88%,#ff3a8c26,#0000) 0 0/380px 320px,radial-gradient(.8px .8px at 18% 42%,#00e5ff2e,#0000) 0 0/300px 260px,radial-gradient(1.1px 1.1px at 72% 15%,#ff6a2b1f,#0000) 0 0/350px 290px;position:fixed;inset:0}body:after{content:"";pointer-events:none;z-index:0;background:radial-gradient(at 30% 0,#ff3a8c0f 0%,#0000 45%),radial-gradient(at 70% 0,#ff6a2b0a 0%,#0000 40%),radial-gradient(at 50% 40%,#0000 35%,#0000008c 100%);position:fixed;inset:0}#app{z-index:1;flex-direction:column;height:100vh;display:flex;position:relative;overflow:hidden}#screen-container{flex:1;overflow:hidden auto}h1,h2,h3{font-family:var(--font-heading);letter-spacing:.04em;text-transform:uppercase;font-weight:700;line-height:1.15}h1{font-size:2.2rem}h2{font-size:1.4rem}h3{font-size:1rem}strong{font-weight:600}.btn{border:1px solid var(--border-light);background:var(--bg-tertiary);color:var(--text-primary);font-family:var(--font-heading);letter-spacing:.06em;text-transform:uppercase;cursor:pointer;-webkit-user-select:none;user-select:none;border-radius:4px;justify-content:center;align-items:center;gap:6px;padding:10px 20px;font-size:13px;font-weight:500;transition:all .2s;display:inline-flex;position:relative;overflow:hidden}.btn:hover{background:var(--bg-elevated);border-color:#ffffff26;box-shadow:0 0 20px #00e5ff0f}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.btn-sm{border-radius:3px;padding:6px 14px;font-size:11px}.btn-primary{background:var(--brand-gradient);color:#fff;text-shadow:0 1px 2px #0000004d;clip-path:var(--clip-corner-sm);background-size:200% 200%;border:1px solid #ff3a8c66;font-weight:600}.btn-primary:hover{background-size:200% 200%;border-color:#ff3a8c99;animation:3s infinite brand-gradient-flow;box-shadow:0 0 30px #ff3a8c33,0 0 60px #ff6a2b1a}.btn-secondary{border-color:var(--border-light);background:0 0}.btn-secondary:hover{color:var(--accent-alt);border-color:#ff3a8c80;box-shadow:0 0 20px #ff3a8c14}.btn-accent{background:linear-gradient(135deg, var(--accent), #00b8d4);color:#000;clip-path:var(--clip-corner-sm);border-color:#00e5ff4d;font-weight:600}.btn-accent:hover{box-shadow:0 0 25px #00e5ff33}.btn-danger{color:var(--danger);background:#ef444414;border-color:#ef444466}.btn-danger:hover{background:var(--danger);color:#fff;border-color:var(--danger);box-shadow:0 0 20px #ef444433}.btn-topbar{color:var(--text-secondary);background:0 0;border-color:#ffffff14;padding:6px 14px;font-size:11px}.btn-topbar:hover{color:var(--text-primary);box-shadow:none;background:#ff3a8c0f;border-color:#ff3a8c66}.btn-back{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;background:0 0;border:none;gap:4px;padding:6px 0;font-size:13px}.btn-back:hover{color:var(--accent-alt);box-shadow:none;background:0 0;border:none}.screen-back-btn{color:var(--text-secondary);cursor:pointer;height:30px;font-size:11px;font-family:var(--font-heading);letter-spacing:.08em;text-transform:uppercase;-webkit-app-region:no-drag;app-region:no-drag;background:#ffffff08;border:1px solid #ffffff14;border-radius:6px;flex-shrink:0;align-items:center;gap:7px;padding:0 12px 0 8px;font-weight:500;transition:border-color .15s,color .15s,background .15s;display:inline-flex}.screen-back-btn .back-arrow{background:linear-gradient(135deg,#ff2d78,#b44dff);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:11px;transition:transform .15s}.screen-back-btn:hover{color:var(--text-primary);background:#ff3a8c0f;border-color:#ff3a8c66}.screen-back-btn:hover .back-arrow{background:linear-gradient(135deg,#ff5c9a,#c97aff);-webkit-background-clip:text;background-clip:text;transform:translate(-2px)}@keyframes home-fade-in{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes home-glow-drift{0%,to{opacity:.6;transform:translate(-50%,-40%)scale(1)}33%{opacity:.8;transform:translate(-45%,-35%)scale(1.1)}66%{opacity:.5;transform:translate(-55%,-45%)scale(.95)}}@keyframes home-border-flow{0%{background-position:0%}50%{background-position:100%}to{background-position:0%}}@keyframes home-hero-shimmer{0%{background-position:-200%}to{background-position:200%}}.home-screen{flex-direction:column;height:100vh;display:flex;overflow:hidden}.screen-entering .home-screen{animation:.3s fade-in}.home-topbar{padding:14px 28px;padding-left:max(28px, env(titlebar-area-x,28px));padding-right:max(28px, calc(100% - env(titlebar-area-x,100%) - env(titlebar-area-width,0px) + 12px));padding-top:max(14px, env(titlebar-area-y,14px));-webkit-app-region:drag;app-region:drag;border-bottom:1px solid #ffffff0a;flex-shrink:0;justify-content:space-between;align-items:center;display:flex}.home-topbar button,.home-topbar a,.home-topbar nav{-webkit-app-region:no-drag;app-region:no-drag}.home-brand{color:var(--text-secondary);align-items:center;gap:10px;display:flex}.home-brand-icon{color:var(--accent);opacity:.8;display:flex}.home-brand-text{font-family:var(--font-heading);letter-spacing:.14em;text-transform:uppercase;background:var(--brand-gradient);-webkit-text-fill-color:transparent;background-size:200% 200%;-webkit-background-clip:text;background-clip:text;font-size:12px;font-weight:600;animation:6s infinite brand-gradient-flow}.home-brand-badge{font-family:var(--font-heading);letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-left:4px;font-size:9px;font-weight:500}.home-topbar-right{align-items:center;gap:16px;display:flex}.topbar-short{display:none}.home-user{align-items:center;gap:10px;display:flex}.user-name{color:var(--text-muted);font-size:12px;font-family:var(--font-mono)}.home-auth-btn{color:var(--accent-alt);font-family:var(--font-body);cursor:pointer;letter-spacing:.02em;background:#ff2d7814;border:1px solid #ff2d7866;border-radius:6px;padding:6px 16px;font-size:12px;font-weight:600;transition:all .2s}.home-auth-btn:hover{background:#ff2d7826;border-color:#ff2d7899;box-shadow:0 0 16px #ff2d781f}.home-auth-btn--profile{border-color:var(--border-light);color:var(--text-secondary);background:0 0}.home-auth-btn--profile:hover{border-color:var(--accent);color:var(--accent);background:#00e5ff0a;box-shadow:0 0 12px #00e5ff14}.home-body{flex:1;justify-content:center;align-items:center;display:flex;overflow:hidden auto}.home-hero{flex-direction:column;align-items:center;gap:40px;width:100%;max-width:780px;padding:32px 36px 40px;display:flex;position:relative;overflow:visible}.home-hero-glow{pointer-events:none;filter:blur(40px);background:radial-gradient(at 30%,#ff3a8c1f 0%,#0000 55%),radial-gradient(at 70% 40%,#ff6a2b14 0%,#0000 50%),radial-gradient(at 50% 60%,#00e5ff0d 0%,#0000 60%);width:1000px;height:700px;animation:12s ease-in-out infinite home-glow-drift;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.home-hero-text{z-index:1;text-align:center;position:relative}.home-title{font-family:var(--font-heading);letter-spacing:.1em;text-transform:uppercase;color:#fff;z-index:1;text-shadow:0 0 40px #ff3a8c33,0 0 80px #ff6a2b1f;font-size:clamp(2.4rem,5vw,3.4rem);font-weight:700;line-height:.9;position:relative}.home-title-accent{background:var(--brand-gradient);-webkit-text-fill-color:transparent;background-size:200% 200%;-webkit-background-clip:text;background-clip:text;animation:4s infinite brand-gradient-flow}.home-footer{bottom:max(12px, env(safe-area-inset-bottom,0px));justify-content:center;align-items:center;gap:var(--space-5);z-index:1;display:flex;position:fixed;left:0;right:0}.home-version{letter-spacing:.05em;color:var(--text-muted,#fff3);-webkit-user-select:none;user-select:none;cursor:pointer;font-size:10px;font-family:var(--font-mono);transition:color var(--duration-fast) ease;background:0 0;border:none;padding:4px 8px}.home-version:hover{color:var(--accent,#00e5ff)}.home-footer-legal{gap:var(--space-4);display:flex}.home-footer-legal a{font-family:var(--font-body);color:var(--text-muted,#fff3);transition:color var(--duration-fast) ease;font-size:10px;text-decoration:none}.home-footer-legal a:hover{color:var(--accent,#00e5ff)}.home-subtitle{color:var(--text-secondary);letter-spacing:.12em;text-transform:uppercase;font-size:13px;font-weight:400;font-family:var(--font-heading);z-index:1;margin-top:12px;position:relative}.home-early-access{color:var(--text-tertiary,#6a5a62);letter-spacing:.04em;z-index:1;opacity:.8;margin-top:10px;font-size:11px;font-weight:400;position:relative}.home-hero-actions{z-index:1;grid-template-columns:repeat(2,1fr);gap:12px;width:100%;display:grid;position:relative}.mode-hero-card{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);cursor:pointer;text-align:left;font-family:var(--font-body);color:var(--text-primary);clip-path:var(--clip-corner);background:#0c0a14cc;border:1px solid #ffffff14;border-radius:2px;padding:18px 22px 16px;transition:transform .25s,box-shadow .25s,border-color .25s;position:relative;overflow:hidden}.mode-hero-card:after{content:"";pointer-events:none;border-top:2px solid #0000;border-left:2px solid #0000;width:24px;height:24px;transition:border-color .3s;position:absolute;top:0;left:0}.mode-hero-card-bg{opacity:0;transition:opacity .35s;position:absolute;inset:0}.mode-hero-card--orange .mode-hero-card-bg{background:linear-gradient(135deg,#ff6a2b1a 0%,#ff3a8c0a 50%,#0000 80%)}.mode-hero-card--magenta .mode-hero-card-bg{background:linear-gradient(135deg,#ff3a8c1f 0%,#ff6a2b0d 50%,#0000 80%)}.mode-hero-card:hover .mode-hero-card-bg{opacity:1}.mode-hero-card--orange{border-color:#ff6a2b40 #ff6a2b40 #ff6a2b40 #ff6a2bb3;border-left-style:solid;border-left-width:3px}.mode-hero-card--orange:after{border-top-color:#ff6a2b80;border-left-color:#ff6a2b80}.mode-hero-card--magenta{border-color:#ff3a8c40 #ff3a8c40 #ff3a8c40 #ff3a8cb3;border-left-style:solid;border-left-width:3px}.mode-hero-card--magenta:after{border-top-color:#ff3a8c80;border-left-color:#ff3a8c80}.mode-hero-card:hover{transform:translateY(-3px)}.mode-hero-card--orange:hover{border-color:#ff6a2b80;box-shadow:0 8px 32px #00000080,0 0 40px #ff6a2b1f}.mode-hero-card--orange:hover:after{border-top-color:#ff6a2bcc;border-left-color:#ff6a2bcc}.mode-hero-card--magenta:hover{border-color:#ff3a8c80;box-shadow:0 8px 32px #00000080,0 0 40px #ff3a8c1f}.mode-hero-card--magenta:hover:after{border-top-color:#ff3a8ccc;border-left-color:#ff3a8ccc}.mode-hero-card:active{transform:translateY(-1px)scale(.99)}.mode-hero-card-content{z-index:1;align-items:center;gap:10px;margin-bottom:6px;display:flex;position:relative}.mode-hero-card-icon{filter:saturate(1.3);font-size:22px;line-height:1}.mode-hero-card-label{font-family:var(--font-heading);letter-spacing:.08em;text-transform:uppercase;flex:1;font-size:15px;font-weight:600}.mode-hero-card-arrow{color:var(--text-muted);font-size:18px;transition:transform .2s,color .2s}.mode-hero-badge{min-width:18px;height:18px;font-size:11px;font-weight:700;font-family:var(--font-body);color:var(--accent);vertical-align:middle;background:#00e5ff33;border-radius:9px;justify-content:center;align-items:center;margin-left:6px;padding:0 5px;line-height:1;animation:2s ease-in-out infinite corr-pulse;display:inline-flex}.mode-hero-card--orange:hover .mode-hero-card-arrow{color:var(--accent-orange);transform:translate(4px)}.mode-hero-card--magenta:hover .mode-hero-card-arrow{color:var(--accent-alt);transform:translate(4px)}.mode-hero-card-desc{color:var(--text-secondary);z-index:1;font-size:12px;font-weight:300;line-height:1.5;position:relative}.home-modes{flex-direction:column;gap:28px;padding:8px 36px 48px;display:flex}.screen-entering .home-topbar{animation:.4s .1s both home-fade-in}.screen-entering .home-hero{animation:.5s .15s both home-fade-in}.screen-entering .mode-section{animation:.5s both home-fade-in}.screen-entering .mode-section:first-child{animation-delay:.3s}.screen-entering .mode-section:nth-child(2){animation-delay:.4s}.screen-entering .mode-section:nth-child(3){animation-delay:.5s}.mode-section-title{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--text-muted);align-items:center;gap:12px;margin-bottom:10px;padding-left:2px;font-size:10px;font-weight:500;display:flex}.mode-section-title:after{content:"";background:linear-gradient(to right, var(--border), transparent 80%);flex:1;height:1px}.mode-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px;display:grid}.mode-card{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--text-primary);cursor:pointer;text-align:left;font-family:var(--font-body);background:#0c0a1499;border:1px solid #ffffff0f;border-radius:2px;align-items:flex-start;gap:14px;width:100%;padding:16px 18px;transition:all .25s;display:flex;position:relative;overflow:hidden}.mode-card-glow{opacity:0;pointer-events:none;background:radial-gradient(at 20% 30%,#00e5ff0a,#0000 70%);transition:opacity .3s;position:absolute;inset:0}.mode-card:before{content:"";border-radius:inherit;-webkit-mask-composite:xor;opacity:0;pointer-events:none;background:linear-gradient(135deg,#00e5ff26,#0000 40% 60%,#ff2d781a);padding:1px;transition:opacity .3s;position:absolute;inset:-1px;-webkit-mask-image:linear-gradient(#fff 0 0),linear-gradient(#fff 0 0);-webkit-mask-position:0 0,0 0;-webkit-mask-size:auto,auto;-webkit-mask-repeat:repeat,repeat;-webkit-mask-clip:content-box,border-box;-webkit-mask-origin:content-box,border-box;-webkit-mask-composite:xor;mask-composite:exclude;-webkit-mask-source-type:auto,auto;mask-mode:match-source,match-source}.mode-card:hover:not(.disabled):before,.mode-card:hover:not(.disabled) .mode-card-glow{opacity:1}.mode-card:hover:not(.disabled){border-color:#ffffff14;transform:translateY(-2px);box-shadow:0 6px 24px #00000059}.mode-card:active:not(.disabled){transform:translateY(0)scale(.99)}.mode-card.disabled{opacity:.4;cursor:not-allowed}.mode-card.disabled .mode-card-glow{display:none}.mode-card-icon{filter:saturate(1.1);flex-shrink:0;margin-top:1px;font-size:24px;line-height:1}.mode-card-content{z-index:1;flex:1;min-width:0;position:relative}.mode-card-title{font-family:var(--font-heading);letter-spacing:.08em;text-transform:uppercase;margin-bottom:3px;font-size:13px;font-weight:600}.mode-card-desc{color:var(--text-muted);font-size:12px;line-height:1.45}.mode-card-badge{color:var(--accent-alt);font-size:8px;font-weight:600;font-family:var(--font-heading);letter-spacing:.1em;text-transform:uppercase;z-index:1;background:#ff2d781a;border:1px solid #ff2d7826;border-radius:2px;padding:2px 8px;position:absolute;top:10px;right:10px}@media (width<=640px){.home-hero{padding:24px 20px 28px}.home-body{align-items:flex-start}.home-hero-actions{grid-template-columns:1fr}.home-modes{padding:8px 20px 40px}.mode-grid{grid-template-columns:1fr}.home-topbar{padding:12px 16px}.home-title{font-size:2.2rem}.home-brand-badge{display:none}.home-topbar-right{gap:6px}.btn-topbar{padding:4px 8px;font-size:.72rem}.topbar-full{display:none}.topbar-short{display:inline}}.setup-screen{flex-direction:column;min-height:100dvh;display:flex;overflow-y:auto}.screen-entering .setup-screen{animation:.5s fade-up}.setup-screen-body{flex-direction:column;flex:1;justify-content:center;gap:24px;width:100%;max-width:520px;margin:0 auto;padding:2.5rem 1.5rem 3rem;display:flex}.setup-row{gap:24px;display:flex}.setup-section{flex-direction:column;gap:10px;display:flex}.setup-section--flex{flex:1;min-width:0}.setup-label{font-family:var(--font-heading);color:var(--text-muted);text-transform:uppercase;letter-spacing:.18em;font-size:10px;font-weight:600}.setup-options{gap:6px;display:flex}.option-btn{border:1px solid var(--border);background:var(--bg-tertiary);color:var(--text-secondary);font-size:12px;font-family:var(--font-heading);letter-spacing:.06em;text-transform:uppercase;cursor:pointer;border-radius:4px;padding:9px 16px;font-weight:500;transition:all .2s}.option-btn.active{border-color:var(--accent);color:var(--accent);background:#00e5ff14;box-shadow:0 0 16px #00e5ff14,inset 0 0 8px #00e5ff0a}.option-btn:hover:not(.active){border-color:var(--border-light);background:var(--bg-elevated)}.setup-time-presets{flex-wrap:wrap;gap:6px;display:flex}.setup-time-custom{align-items:flex-end;gap:8px;margin-top:4px;display:flex}.setup-time-custom label{color:var(--text-muted);font-size:10px;font-family:var(--font-heading);letter-spacing:.08em;text-transform:uppercase;flex-direction:column;gap:4px;display:flex}.setup-time-custom input{border:1px solid var(--border);background:var(--bg-primary);color:var(--text-primary);font-family:var(--font-mono);border-radius:4px;width:80px;padding:8px 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#0000004d}.piece-token-translucent:has(.piece-white){background:#ffffff1a;box-shadow:inset 0 0 0 1px #ffffff2e,0 2px 8px #0000004d}.piece-token-translucent:has(.piece-black){background:#a08cb440;box-shadow:inset 0 0 0 1px #ffffff1a,0 2px 8px #0006}.piece-token-translucent .piece-symbol.piece-white{color:#fff;filter:drop-shadow(0 1px 2px #00000080)}.piece-token-translucent .piece-symbol.piece-black{color:var(--piece-black);filter:drop-shadow(0 -1px #ffffff80)drop-shadow(0 1px #000000b3)drop-shadow(0 0 4px #fff3)}[data-sandbox-theme=void] .board{background:var(--border)}[data-sandbox-theme=void] .sandbox-topbar{border-bottom:1px solid var(--border)}[data-sandbox-theme=amber] .board{box-shadow:0 8px 40px #00000080, inset 0 0 0 1px var(--border);border-radius:6px;overflow:visible}[data-sandbox-theme=amber] .gameplay-right-panel{font-family:var(--font-body)}[data-sandbox-theme=quantum-lab] .gameplay-board-area{position:relative}[data-sandbox-theme=quantum-lab] 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.gameplay-right-panel{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#3c1e2d66;border:1px solid #fb71851f;border-radius:16px;margin:12px 0 12px 12px}[data-sandbox-theme=rose-glass] .sandbox-topbar,[data-sandbox-theme=rose-glass] .gameplay-topbar{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#28141e99}[data-sandbox-theme=rose-glass] .board{border:1px solid #fb71851f;border-radius:16px;overflow:visible;box-shadow:0 0 80px #fb71850a,0 16px 48px #0006}[data-sandbox-theme=rose-glass] .sandbox-palette-area{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#3c1e2d66;border-top:1px solid #fb71851f}.sandbox-layout .board-container,[data-mode=sandbox] .board-container,.sandbox-layout .board-coords,[data-mode=sandbox] .board-coords{max-width:100%;max-height:100%}@media (width<=768px){.gameplay-center-group,[data-mode=vs_ai] .gameplay-center,[data-mode=online] .gameplay-center,[data-mode=correspondence] .gameplay-center{flex-direction:column;gap:0;padding:8px}.gameplay-board-col{flex:none;width:100%}.gameplay-top-slot,.gameplay-bottom-slot{align-self:stretch;width:100%;max-width:none}.gameplay-captured-panel{display:none}[data-mode=vs_ai] .gameplay-right-panel,[data-mode=online] .gameplay-right-panel,[data-mode=correspondence] .gameplay-right-panel{border:none;border-top:1px solid var(--border);background:var(--bg-secondary);border-radius:0;flex:1;width:100%;height:auto;min-height:0;margin:8px 0 0;padding:8px 12px;transform:none}.gameplay-info-tabs{flex-shrink:0;gap:12px;padding:8px 0 4px;display:flex}.gameplay-right-panel .gameplay-tab-content{flex:1;min-height:0}.gameplay-right-panel .gameplay-tab-pane{display:none}.gameplay-right-panel .gameplay-tab-pane.active{flex:1;min-height:0;display:block;overflow-y:auto}.gameplay-right-panel .gameplay-captured-tab{display:none}.gameplay-right-panel .gameplay-captured-tab.active{display:block}.gameplay-right-panel .move-history-list{max-height:none}.board{--board-chrome-h:220px;--board-chrome-w:16px;max-width:none;max-height:none}.gameplay-eval-bar{flex-direction:row;gap:6px;width:100%;display:flex;position:static}.gameplay-eval-bar .eval-bar{flex-direction:column;gap:2px}.gameplay-eval-bar .eval-bar-track{width:100%;height:8px;min-height:8px}.gameplay-eval-bar .eval-bar-track--classical{border-radius:4px 4px 0 0}.gameplay-eval-bar .eval-bar-track--quantum{border-radius:0 0 4px 4px}.gameplay-eval-bar .eval-bar-fill{border-radius:4px 0 0 4px;transition:width .6s;inset:0 auto 0 0;height:100%!important}.gameplay-eval-bar .eval-bar-fill--quantum{border-top:none;border-right:2px solid #fff9}.gameplay-eval-bar .eval-bar-labels{flex-direction:column;gap:2px;min-width:28px}.piece-token,.piece-ring-wrap{width:92%;height:92%}.ring-gauge{width:calc(100% + 8px);height:calc(100% + 8px);inset:-4px}.gameplay-eval-bar .eval-bar-label{text-align:right;font-size:9px}.gameplay-controls{padding-bottom:calc(12px + env(safe-area-inset-bottom,0px))}.home-hero{padding:40px 20px 32px}.home-title{font-size:2.4rem}.mode-grid,.mode-grid--featured{grid-template-columns:1fr}.gameover-screen{padding:24px 16px}.gameover-title{font-size:2rem}.gameover-actions{flex-direction:column;width:100%;max-width:280px}.gameover-actions .btn{width:100%;min-height:48px}.gameover-stats{gap:10px}.stat{min-width:90px;padding:14px 18px}.setup-screen-body{padding:1.5rem 1.25rem 2rem;padding-bottom:calc(2rem + env(safe-area-inset-bottom,0px));justify-content:flex-start;gap:1.75rem}.setup-section{gap:10px}.setup-row{flex-direction:column;gap:1.5rem}.setup-side-visual{gap:8px}.setup-side-btn{gap:6px;padding:12px 8px}.setup-side-icon{font-size:22px}.setup-side-label{font-size:12px}.btn-start{margin-top:.5rem;padding:14px 24px}.modal-dialog{width:94%;padding:20px}.modal-actions{flex-direction:column;gap:8px}.modal-actions .btn{justify-content:center;width:100%;min-height:48px}.play-overlay-root{justify-content:stretch;align-items:stretch}.play-overlay{-webkit-overflow-scrolling:touch;border-radius:0;width:100%;max-height:none;animation:.2s fade-in;overflow-y:auto;clip-path:none!important}.play-overlay-body{padding:12px 16px 24px;padding-bottom:calc(24px + env(safe-area-inset-bottom,0px))}.play-overlay-header{padding:16px 16px 0}.play-overlay-close{justify-content:center;align-items:center;min-width:44px;min-height:44px;display:flex}.play-overlay-body .setup-side-visual{flex-direction:row}.play-overlay-body .setup-side-btn{padding:12px 8px}.play-overlay-body .setup-side-icon{font-size:28px}.play-overlay-body .btn-start{min-height:52px;font-size:16px}.option-btn{min-height:44px;padding:10px 14px}.btn-back{min-height:44px;padding:10px 0}.screen-back-btn{min-height:44px;padding:0 14px 0 12px}.toast-container{top:12px;left:12px;right:12px}.toast{width:100%}.sandbox-layout,.sandbox-layout[data-sandbox-theme],[data-mode=sandbox]{flex-direction:column!important;height:100dvh!important;display:flex!important;overflow:hidden!important}.sandbox-center-group,[data-mode=sandbox] .gameplay-center{flex-direction:column;flex:1;align-items:stretch;gap:0;min-height:0;padding:0}.sandbox-center-group .sandbox-palette-area,[data-mode=sandbox] .gameplay-center .sandbox-palette-area{flex:none;order:2;align-self:center;width:auto;padding:clamp(4px,1vh,12px) 4px}.sandbox-center-group .sandbox-palette-area .sandbox-editor,[data-mode=sandbox] .gameplay-center .sandbox-palette-area .sandbox-editor{margin-top:0;margin-bottom:0;transform:none}.sandbox-center-group .sandbox-board-col,[data-mode=sandbox] .gameplay-center .gameplay-board-col{flex:none;order:1}.sandbox-center-group .sandbox-fen-bar,[data-mode=sandbox] .gameplay-center .sandbox-fen-bar{padding:clamp(4px,2vh,48px) 12px clamp(4px,1vh,12px)}.sandbox-center-group .gameplay-board-area,[data-mode=sandbox] .gameplay-center .gameplay-board-area{justify-content:center;align-items:center;padding:4px 0 16px;display:flex}.sandbox-fen-bar{padding:12px 16px 4px}.sandbox-fen-bar-input{font-size:14px}.sandbox-fen-copy,.sandbox-fen-paste{flex-shrink:0}.sandbox-phase-bar{grid-area:phasebar;padding:clamp(4px,1vh,12px) 16px;font-size:clamp(11px,1.8vh,14px);display:flex}@media (height<=700px){.sandbox-phase-bar{display:none}}.sandbox-toggles-mobile{grid-area:toggles;justify-content:center;align-items:center;gap:14px;padding:6px 12px;display:flex}.sandbox-toggles-mobile .sandbox-toggle{gap:8px;min-height:36px;font-size:14px}.sandbox-toggles-mobile .sandbox-toggle input[type=checkbox]{width:22px;height:22px}.sandbox-toggles-mobile .sandbox-toggle input[type=checkbox]:checked:after{font-size:16px;top:0;left:3px}.sandbox-toggles-mobile .sandbox-toggle-label{font-size:14px}.sandbox-toggles-mobile .sandbox-measurement-btn{min-height:32px;padding:5px 12px;font-size:13px}.sandbox-topbar .sandbox-toggles,.sandbox-topbar .sandbox-phase-pill{display:none}.sandbox-layout .gameplay-board-area,[data-mode=sandbox] .gameplay-board-area{justify-content:center;align-items:flex-end;padding:4px 4px 2px;display:flex;overflow:hidden}[data-mode=sandbox] .board{--board-chrome-h:260px}[data-mode=sandbox][data-phase=playing] .board{--board-chrome-h:280px}.sandbox-layout .sandbox-info-panel,[data-mode=sandbox] .gameplay-right-panel{border:none;border-top:1px solid var(--border);background:var(--bg-secondary);border-radius:0;flex-direction:column;flex:1;order:3;width:100%;height:auto;min-height:0;margin-top:14px;padding:8px 12px;overflow:hidden;transform:none}[data-mode=sandbox] .gameplay-right-panel .gameplay-moves-header{flex-shrink:0}[data-mode=sandbox] .gameplay-right-panel .gameplay-moves-panel{flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}[data-mode=sandbox] .gameplay-right-panel .gameplay-move-history{flex:1;min-height:0;overflow-y:auto}[data-mode=sandbox] .gameplay-right-panel .gameplay-captured-tab{flex-shrink:0}.gameplay-info-tab[data-tab=captured]{display:inline}.gameplay-tab-pane{display:none}.gameplay-tab-pane.active{flex:1;min-height:0;display:block;overflow-y:auto}.gameplay-tab-content{flex:1;min-height:0}[data-mode=sandbox] .gameplay-right-panel .move-history{overflow:visible}[data-mode=sandbox] .gameplay-right-panel .move-history-list{max-height:none}[data-mode=sandbox][data-phase=editing] .gameplay-right-panel{display:none!important}[data-mode=sandbox][data-phase=playing] .gameplay-right-panel{display:flex!important}.sandbox-layout .sandbox-statusbar,[data-mode=sandbox] .sandbox-statusbar,.sandbox-layout[data-phase=playing] .sandbox-palette-area,[data-mode=sandbox][data-phase=playing] .sandbox-palette-area{display:none!important}.sandbox-layout[data-phase=playing] .sandbox-toggles-mobile .sandbox-toggle,[data-mode=sandbox][data-phase=playing] .sandbox-toggles-mobile .sandbox-toggle{display:none}.sandbox-topbar{flex-wrap:wrap;gap:8px;padding:12px 16px}.sandbox-phase-controls{gap:6px}.sandbox-phase-pill{align-items:center;min-height:28px;padding:5px 12px;font-size:11px;display:flex}.sandbox-play-toggle{min-height:32px;padding:5px 14px;font-size:12px}.sandbox-toggles{flex-wrap:wrap;gap:10px}.sandbox-toggle{gap:6px;min-height:32px;font-size:12px}.sandbox-toggle input[type=checkbox]{width:18px;height:18px}.sandbox-toggle input[type=checkbox]:checked:after{font-size:13px;top:0;left:2px}.sandbox-toggle-label{font-size:12px}.sandbox-measurement-btn{min-height:28px;padding:4px 10px;font-size:11px}.sandbox-topbar-actions{gap:2px}.btn-icon{min-width:36px;min-height:32px;padding:4px 8px;font-size:16px}.sandbox-palette-area{padding:2px 4px}.sandbox-editor{background:0 0;border:none;padding:2px 4px}.sandbox-palette-with-actions{flex-direction:column;justify-content:center}.sandbox-palette{flex-direction:column;gap:3px}.sandbox-palette-row{flex-direction:row;justify-content:center;gap:3px}.sandbox-palette-area .sandbox-piece{width:clamp(40px,7vh,60px);height:clamp(40px,7vh,60px)}.sandbox-piece .piece-symbol{font-size:34px}.sandbox-piece .piece-bare{font-size:38px}.sandbox-piece-token{width:42px;height:42px}.sandbox-fen-row{display:none}.sandbox-controls-play,.sandbox-controls-edit{display:inline-flex}.sandbox-layout[data-phase=playing] .sandbox-controls-edit,[data-mode=sandbox][data-phase=playing] .sandbox-controls-edit{pointer-events:none;opacity:.3}.sandbox-palette-play-btn{display:none}.sandbox-palette-actions{display:none!important}.sandbox-controls{padding:clamp(4px,1.5vh,12px) 16px;padding-bottom:max(clamp(8px, 2vh, 20px), calc(env(safe-area-inset-bottom,8px) + 4px));justify-content:center;gap:8px}.sandbox-controls .btn,.sandbox-controls .btn-sm{min-height:clamp(32px,5vh,44px);padding:clamp(4px,1vh,8px) 20px;font-size:14px}.piece-bare,.piece-glow{font-size:min(9vw,42px)}.piece-symbol{font-size:min(8vw,36px)}}@media (width<=480px){.home-title{letter-spacing:.06em;font-size:1.8rem}.home-hero{padding:24px 16px 20px}.home-subtitle{font-size:11px}.home-toolbar{flex-direction:column;align-items:flex-start}.mode-hero-card{padding:18px 16px 14px}.mode-hero-card-icon{font-size:22px}.mode-hero-card-label{font-size:15px}[data-mode=sandbox] .board{--board-chrome-h:270px;--board-chrome-w:12px}[data-mode=sandbox][data-phase=playing] .board{--board-chrome-h:290px}.sandbox-palette-area .sandbox-piece{width:clamp(36px,6.5vh,52px);height:clamp(36px,6.5vh,52px)}.sandbox-piece .piece-symbol{font-size:28px}.sandbox-piece .piece-bare{font-size:32px}.sandbox-piece-token{width:36px;height:36px}.sandbox-topbar{gap:6px;padding:10px 16px}.sandbox-phase-pill{min-height:26px;padding:4px 10px;font-size:10px}.sandbox-play-toggle{min-height:28px;padding:4px 12px;font-size:11px}.sandbox-toggle{min-height:28px;font-size:10px}.sandbox-toggle input[type=checkbox]{width:16px;height:16px}.sandbox-measurement-btn{min-height:26px;padding:3px 8px;font-size:10px}.btn-icon{min-width:32px;min-height:28px;font-size:14px}.play-overlay-body{padding-bottom:calc(28px + env(safe-area-inset-bottom,0px))}.setup-screen-body{padding:1.25rem 1rem 1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));justify-content:flex-start;gap:1.5rem}.setup-row{flex-direction:column;gap:1.25rem}.setup-side-btn{gap:4px;padding:10px 6px}.setup-side-icon{font-size:22px}}.play-overlay-root{z-index:var(--z-modal);justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.play-overlay-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0009;position:absolute;inset:0}.play-overlay{z-index:1;background:var(--bg-secondary,#0c0a14);width:min(440px,90vw);max-height:85vh;clip-path:var(--clip-corner);border:1px solid #ff3a8c1f;border-radius:2px;animation:.3s fade-up;position:relative;overflow-y:auto;box-shadow:0 24px 80px #000000b3,0 0 40px #ff3a8c0a}.play-overlay-header{justify-content:space-between;align-items:center;padding:20px 24px 0;display:flex}.play-overlay-header h2{margin:0;font-size:20px;font-weight:600}.play-overlay-close{color:var(--text-muted,#888);cursor:pointer;background:0 0;border:none;border-radius:6px;padding:4px 8px;font-size:20px;transition:color .15s,background .15s}.play-overlay-close:hover{color:var(--text-primary,#fff);background:var(--bg-hover,#ffffff14)}.play-overlay-body{flex-direction:column;gap:16px;padding:16px 24px 24px;display:flex}.play-overlay-body .btn-start{width:100%;margin-top:8px;padding:12px;font-size:16px}@keyframes ai-thinking-pulse{0%,to{opacity:.5}50%{opacity:1}}.player-banner.ai-thinking{animation:2s ease-in-out infinite ai-thinking-pulse}@media (width>=769px){.gameplay-board-col{position:relative}.gameplay-eval-bar{flex-direction:column;gap:3px;width:32px;margin-right:8px;display:flex;position:absolute;top:0;bottom:0;right:100%}.gameplay-eval-bar .eval-bar-fill{width:100%!important}}.eval-bar{flex-direction:row;flex:1;gap:2px;display:flex}.eval-bar-track{flex:1;position:relative;overflow:hidden}.eval-bar-track--classical{background:#ffffff14;border-radius:5px 0 0 5px}.eval-bar-track--quantum{background:#000;border-radius:0 5px 5px 0}.eval-bar-fill{border-radius:0;transition:height 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.12s,transform .1s;display:flex}.promotion-option:first-child{border-radius:var(--radius-md,6px) var(--radius-md,6px) 0 0}.promotion-option:last-child{border-radius:0 0 var(--radius-md,6px) var(--radius-md,6px)}.promotion-option:hover{background:var(--bg-tertiary,#141020);z-index:1;transform:scale(1.08)}.promotion-option:active{transform:scale(.96)}.promotion-option .piece-token{aspect-ratio:1;border-radius:50%;justify-content:center;align-items:center;width:80%;display:flex}.promotion-option .piece-symbol{font-size:clamp(20px,4vw,36px);line-height:1}.online-lobby-screen{flex-direction:column;min-height:100dvh;display:flex;overflow-y:auto}.online-lobby-body{flex-direction:column;flex:1;justify-content:center;align-items:center;gap:1.25rem;width:100%;max-width:640px;margin:0 auto;padding:2rem 1.5rem;display:flex}.online-lobby-card{background:var(--surface-2,#ffffff0a);border:1px solid var(--border-1,#ffffff14);text-align:center;border-radius:.75rem;width:100%;padding:1.5rem}.online-lobby-card--matchmaking{max-width:480px}.online-lobby-heading{font-family:var(--font-heading);color:var(--text-1,#fff);letter-spacing:.06em;text-transform:uppercase;margin:0 0 .35rem;font-size:1rem;font-weight:600}.online-lobby-desc{color:var(--text-2,#fff9);margin:0 0 1rem;font-size:.8rem}.online-lobby-btn{min-width:120px}.online-lobby-divider{color:var(--text-3,#fff6);text-transform:uppercase;letter-spacing:.1em;font-size:.75rem}.online-lobby-friend-row{grid-template-columns:1fr 1fr;gap:1rem;width:100%;display:grid}.matchmaking-options{flex-direction:column;gap:1rem;display:flex}.time-preset-group{flex-direction:column;gap:.35rem;display:flex}.time-preset-label{font-family:var(--font-heading);letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);font-size:.65rem;font-weight:500}.time-preset-row{justify-content:center;gap:.5rem;display:flex}.option-btn--sm{padding:6px 14px;font-size:.8rem}.matchmaking-queue-btns{justify-content:center;gap:.75rem;margin-top:.25rem;display:flex}.matchmaking-status{color:var(--text-secondary);justify-content:center;align-items:center;gap:.6rem;padding:1rem 0;font-size:.9rem;display:flex}.matchmaking-spinner{border:2px solid #ffffff26;border-top-color:var(--accent);border-radius:50%;width:18px;height:18px;animation:.8s linear infinite matchmaking-spin}@keyframes matchmaking-spin{to{transform:rotate(360deg)}}.lobby-stats-bar{border:1px solid var(--border);background:#ffffff08;border-radius:.5rem;flex-wrap:wrap;align-items:center;gap:1rem;width:100%;padding:.6rem 1rem;display:flex}.lobby-stat-item{white-space:nowrap;align-items:center;gap:.4rem;display:flex}.lobby-stat-icon{font-size:.85rem}.lobby-stat-label{color:var(--text-muted);font-family:var(--font-heading);letter-spacing:.08em;text-transform:uppercase;font-size:.7rem}.lobby-stat-value{font-family:var(--font-mono);color:var(--accent);font-size:.85rem;font-weight:600}.lobby-stat-divider{background:var(--border-light);width:1px;height:1.2rem}.lobby-stat-breakdown{flex-wrap:wrap;gap:.4rem;margin-left:auto;display:flex}.lobby-stat-tc{font-family:var(--font-mono);color:var(--text-secondary);background:#ffffff0a;border-radius:.25rem;padding:.15rem 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