/* Skill arenas: the game panel, results, score gate and Trainer Card */
.ar-top{padding:clamp(22px,3.4vw,40px) 0 clamp(56px,7vw,96px)}
.ar-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:10px 40px;margin-bottom:18px}
.ar-head .mg-eyebrow{flex:1 0 100%}
.ar-h1{margin:0;font-family:'Archivo',system-ui,sans-serif;font-style:italic;font-weight:900;font-stretch:70%;text-transform:uppercase;font-size:clamp(40px,4.6vw,68px);line-height:.9;letter-spacing:-0.005em}
.ar-sub{margin:0;max-width:30em;font-size:17px;line-height:1.5;color:var(--mute)}
.ar-vs{margin:0 0 14px;padding:12px 16px;background:rgba(200,245,90,.08);box-shadow:inset 3px 0 0 var(--acc);font-size:13px;letter-spacing:.06em;color:var(--ink)}
.ar-vs b{color:var(--acc)}

.ar-pad{position:relative;display:flex;align-items:center;justify-content:center;height:clamp(300px,46vh,440px);padding:24px;box-sizing:border-box;overflow:hidden;background:#101216;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:manipulation;-webkit-tap-highlight-color:transparent;clip-path:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px)}
.ar-pad:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--acc)}
.ar-pad .mg-corners{--l:26px;background:
linear-gradient(var(--k),var(--k)) 100% 0/var(--l) var(--w) no-repeat,linear-gradient(var(--k),var(--k)) 100% 0/var(--w) var(--l) no-repeat,
linear-gradient(var(--k),var(--k)) 0 100%/var(--l) var(--w) no-repeat,linear-gradient(var(--k),var(--k)) 0 100%/var(--w) var(--l) no-repeat}
.ar-grid{position:absolute;inset:0;background:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px) 0 0/40px 40px,linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px) 0 0/40px 40px,radial-gradient(circle at 50% 50%,transparent 30%,rgba(12,13,16,.85) 100%)}
.ar-s{position:relative;z-index:2;display:none;flex-direction:column;align-items:center;gap:12px;text-align:center}
.ar-s p{margin:0}
[data-state="idle"] .ar-s-idle,[data-state="wait"] .ar-s-wait,[data-state="go"] .ar-s-go,[data-state="early"] .ar-s-early,[data-state="hit"] .ar-s-hit,[data-state="done"] .ar-s-done{display:flex}
.ar-big{font-family:'Archivo',system-ui,sans-serif;font-style:italic;font-weight:900;font-stretch:70%;text-transform:uppercase;font-size:clamp(40px,5vw,64px);line-height:1}
.ar-hint{font-size:15px;color:var(--mute)}
.ar-hint b{color:var(--ink)}
.ar-tag{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim)}
.ar-red{color:var(--red)}
[data-state="wait"] .ar-red{animation:ar-blink .8s steps(2,end) infinite}
.ar-touch{display:none}
@media (pointer:coarse){.ar-mouse{display:none}.ar-touch{display:inline}}
.ar-spin{transform-origin:60px 60px;animation:ar-spin 16s linear infinite}
.ar-ms{display:flex;align-items:baseline;gap:8px;font-family:'Archivo',system-ui,sans-serif;font-style:italic;font-weight:900;font-stretch:70%;font-size:clamp(96px,13vw,168px);line-height:.86;color:var(--acc)}
.ar-ms small{font-size:.26em;color:var(--mute)}
.ar-pct{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--acc)}
[data-state="wait"] .ar-pad{background:#130F10}
[data-state="go"] .ar-pad{background:var(--acc);animation:ar-flash .25s ease-out}
[data-state="go"] .ar-grid,[data-state="go"] .mg-corners{display:none}
.ar-now{font-family:'Archivo',system-ui,sans-serif;font-style:italic;font-weight:900;font-stretch:70%;text-transform:uppercase;font-size:clamp(96px,14vw,180px);line-height:1;color:#0C0D10}
[data-state="early"] .ar-pad{background:#1A0F0D;box-shadow:inset 0 0 0 2px var(--red)}
[data-state="early"] .mg-corners{--k:var(--red)}

.ar-strip{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:1px;margin-top:2px;background:var(--line);box-shadow:0 0 0 1px var(--line)}
.ar-strip>div{display:flex;flex-direction:column;gap:6px;padding:12px 16px;background:var(--panel)}
.ar-strip span{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.ar-strip b{font-size:20px;font-weight:500}
.ar-strip .ar-acc{color:var(--acc)}
.ar-dots{display:flex;gap:6px;margin:3px 0 0;padding:0;list-style:none}
.ar-dots li{width:18px;height:18px;background:#22252D;clip-path:polygon(5px 0,100% 0,100% calc(100% - 5px),calc(100% - 5px) 100%,0 100%,0 5px)}
.ar-dots li.is-on{background:var(--acc)}

.ar-after{display:grid;gap:14px;margin-top:14px}
.ar-gate{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px 32px;padding:22px 24px;background:linear-gradient(90deg,rgba(200,245,90,.09),var(--panel) 60%);box-shadow:inset 0 0 0 1px rgba(200,245,90,.45);clip-path:polygon(16px 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%,0 16px)}
.ar-gate-t p{margin:0;font-size:15px;color:var(--mute)}
.ar-gate-h{margin:0 0 4px!important;font-family:'Archivo',system-ui,sans-serif;font-style:italic;font-weight:900;font-stretch:72%;text-transform:uppercase;font-size:30px!important;line-height:1;color:var(--ink)!important}
.ar-gate-row{display:flex;flex:1 1 440px;max-width:560px;gap:10px}
.ar-gate input,.ar-card input{flex:1;min-width:0;min-height:56px;padding:0 16px;box-sizing:border-box;border:0;background:#0C0D10;color:var(--ink);font:inherit;font-size:17px;box-shadow:inset 0 0 0 1px #3A3F4A}
.ar-gate input:focus,.ar-card input:focus{outline:none;box-shadow:inset 0 0 0 2px var(--acc)}
.ar-err{flex:1 0 100%;margin:0;font-size:14px;color:var(--red)}
.ar-actions{display:flex;flex-wrap:wrap;gap:12px}
.ar-card{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:22px;align-items:start;padding:20px;background:var(--panel);clip-path:polygon(16px 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%,0 16px)}
.ar-card-img img{display:block;width:100%;height:auto;background:#0C0D10;aspect-ratio:1200/630}
.ar-card-side{display:flex;flex-direction:column;gap:12px}
.ar-lbl{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.ar-card-btns{display:flex;flex-wrap:wrap;gap:8px}
.ar-sbtn{min-height:46px;padding:0 18px;border:0;background:#1B1E24;color:var(--ink);font:inherit;font-weight:700;font-size:15px;cursor:pointer;box-shadow:inset 0 0 0 1px #3A3F4A}
.ar-sbtn:hover{box-shadow:inset 0 0 0 1px var(--acc);color:var(--acc)}
.ar-ok{min-height:1.4em;margin:0;font-size:12px;letter-spacing:.08em;color:var(--acc)}

@media (max-width:900px){.ar-card{grid-template-columns:1fr}}
@media (max-width:640px){
.ar-head{margin-bottom:14px}
.ar-sub{font-size:15px}
.ar-pad{height:clamp(260px,40vh,340px)}
.ar-strip{grid-template-columns:repeat(3,minmax(0,1fr))}
.ar-strip>div:first-child{grid-column:1/-1;flex-direction:row;align-items:center;justify-content:space-between}
.ar-strip>div{padding:10px 14px}
.ar-strip b{font-size:17px}
.ar-gate{padding:18px}
.ar-gate-h{font-size:24px!important}
.ar-gate-row{flex-direction:column;flex-basis:100%}
.ar-actions .mg-btn{flex:1 1 100%}
}
/* Aim trainer: targets are drawn on a canvas over the panel */
.ar-aim .ar-pad{height:clamp(320px,52vh,500px);touch-action:none}
.ar-canvas{position:absolute;inset:0;z-index:1;width:100%;height:100%}
@media (pointer:fine){.ar-aim[data-state="play"] .ar-pad{cursor:none}}

/* Canvas arenas: maze game, timing test, steady hand test */
.ar-cv .ar-pad{height:clamp(320px,52vh,500px);touch-action:none}
.ar-cv[data-state="play"] .ar-grid{opacity:.5}
.ar-solved{display:none;position:absolute;left:0;right:0;top:50%;z-index:3;margin:0;transform:translateY(-50%) rotate(-4deg);text-align:center;font-size:clamp(44px,6vw,72px);color:var(--acc);text-shadow:0 4px 0 #0C0D10;pointer-events:none}
.ar-cv.is-solved .ar-solved{display:block;animation:ar-flash .4s ease-out}
@media (pointer:fine){.ar-sh[data-state="play"] .ar-pad{cursor:crosshair}}

/* Packing puzzle: the box, the tray of pieces and the rotate button */
.pk-pad{position:relative;min-height:clamp(300px,46vh,440px);padding:clamp(18px,3vw,32px);box-sizing:border-box;background:#101216;clip-path:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px)}
.pk-pad .mg-corners{--l:26px}
.pk-play{position:relative;z-index:2;display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(20px,4vw,56px);align-items:start}
.pk-label{margin:0 0 12px}
.pk-boxwrap{position:relative}
.pk-board{--cell:clamp(40px,5.2vw,64px);display:grid;grid-template-columns:repeat(var(--cols),var(--cell));grid-template-rows:repeat(var(--rows),var(--cell));gap:3px;width:max-content;padding:3px;background:#2A2E37;box-shadow:0 0 0 2px #3A3F4A;touch-action:none;user-select:none;-webkit-user-select:none}
.pk-board:focus-visible{outline:2px solid var(--acc);outline-offset:5px}
.pk-cell{background:#0C0D10;transition:background-color .12s}
.pk-cell.is-full{box-shadow:inset 0 0 0 2px rgba(12,13,16,.28)}
.pk-cell.is-ghost{background:rgba(200,245,90,.5)!important}
.pk-cell.is-bad{background:rgba(255,77,46,.5)!important}
.pk-cell.is-cur{box-shadow:inset 0 0 0 2px var(--acc)}
.pk-packed{display:none;position:absolute;left:0;right:0;top:50%;margin:0;transform:translateY(-30%) rotate(-4deg);text-align:center;font-size:clamp(44px,6vw,72px);color:var(--acc);text-shadow:0 4px 0 #0C0D10;pointer-events:none}
.ar-pk.is-packed .pk-packed{display:block;animation:ar-flash .4s ease-out}
.pk-tray{display:flex;flex-wrap:wrap;align-items:flex-start;gap:12px;min-height:64px}
.pk-piece{--c:clamp(16px,1.9vw,22px);display:grid;grid-template-columns:repeat(var(--cols),var(--c));grid-template-rows:repeat(var(--rows),var(--c));gap:2px;padding:9px;border:0;background:#1B1E24;cursor:grab;touch-action:none;box-shadow:inset 0 0 0 1px #3A3F4A}
.pk-piece:hover{box-shadow:inset 0 0 0 1px var(--soft)}
.pk-piece.is-sel{background:#252A33;box-shadow:inset 0 0 0 2px var(--acc)}
.pk-rot{display:inline-flex;align-items:center;gap:10px;margin-top:18px}
.pk-rot:disabled{opacity:.4;cursor:default}
.pk-rot:disabled:hover{box-shadow:inset 0 0 0 1px #3A3F4A;color:var(--ink)}
.pk-key{padding:2px 7px;font-size:11px;box-shadow:inset 0 0 0 1px #3A3F4A}
.pk-done{position:absolute;inset:0;z-index:4;justify-content:center;background:rgba(16,18,22,.95)}
.ar-pk[data-state="done"] .pk-play{visibility:hidden}
@media (pointer:coarse){.pk-key{display:none}}
@media (max-width:760px){
.pk-play{grid-template-columns:1fr}
.pk-board{--cell:min(calc((100vw - 120px) / 6),52px)}
.pk-piece{--c:15px;padding:7px}
.pk-rot{margin-top:12px}
}

/* Test-chamber HUD over every arena panel (assets/js/arena.js adds it) */
.has-hud .ar-pad,.has-hud .pk-pad{box-shadow:inset 0 0 0 1px rgba(200,245,90,.10),inset 0 0 80px rgba(0,0,0,.55)}
.has-hud .ar-pad::after,.has-hud .pk-pad::after{content:"";position:absolute;inset:0;z-index:4;pointer-events:none;background:repeating-linear-gradient(0deg,rgba(255,255,255,.028) 0 1px,transparent 1px 3px)}
.ar-hud{position:absolute;inset:0;z-index:5;pointer-events:none;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.ar-hud>span{position:absolute;display:flex;align-items:center;gap:8px;line-height:1}
.ar-hud-tl{top:14px;left:20px;color:var(--acc)}
.ar-hud-tr{top:14px;right:20px}
.ar-hud-bl{bottom:14px;left:20px}
.ar-hud-bl b{color:var(--soft);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:.08em}
.ar-hud-br{bottom:14px;right:20px}
.ar-hud b{font-weight:700}
.ar-rec{width:7px;height:7px;border-radius:50%;background:#3A3F4A}
.is-live .ar-rec{background:var(--red);box-shadow:0 0 8px var(--red);animation:ar-blink 1.1s steps(2,end) infinite}
.is-live .ar-hud-tr{color:var(--ink)}
.is-boot .ar-hud-tr b{color:var(--acc);animation:ar-blink .3s steps(2,end) infinite}
[data-state="go"] .ar-hud,[data-state="go"] .ar-hud-tl,[data-state="go"] .ar-hud-bl b{color:rgba(12,13,16,.7)}
[data-state="go"] .ar-pad::after{opacity:.4}
.ar-scan{position:absolute;left:0;right:0;top:0;z-index:3;height:38%;pointer-events:none;opacity:0;background:linear-gradient(180deg,transparent,rgba(200,245,90,.10) 70%,rgba(200,245,90,.55) 99%,transparent);border-bottom:1px solid var(--acc)}
.is-boot .ar-scan{animation:ar-sweep .9s cubic-bezier(.4,0,.2,1) both}
.ar-fx{position:absolute;inset:0;z-index:6;width:100%;height:100%;pointer-events:none}
.has-hud .ar-canvas{filter:drop-shadow(0 0 6px rgba(200,245,90,.25))}
.fx-hit .ar-pad,.fx-hit .pk-pad{animation:ar-edge-hit .35s ease-out}
.fx-miss .ar-pad,.fx-miss .pk-pad{animation:ar-edge-miss .4s ease-out}
.fx-shake .ar-pad,.fx-shake .pk-pad{animation:ar-shake .28s cubic-bezier(.36,.07,.19,.97)}
.fx-miss.fx-shake .ar-pad,.fx-miss.fx-shake .pk-pad{animation:ar-shake .28s cubic-bezier(.36,.07,.19,.97),ar-edge-miss .4s ease-out}
.is-logged .ar-s-done .ar-ms{animation:ar-land .7s cubic-bezier(.2,1.4,.4,1) both;text-shadow:0 0 34px rgba(200,245,90,.45)}
.is-logged .ar-s-done .ar-tag{animation:ar-type .5s steps(12,end) both}
.has-hud .ar-s-done{gap:14px}
.ar-pk.has-hud .pk-pad{padding-top:46px;padding-bottom:40px}
.has-hud .ar-pad:focus-visible{box-shadow:inset 0 0 0 2px var(--acc)}
.has-hud[data-state="early"] .ar-pad{box-shadow:inset 0 0 0 2px var(--red)}
@media (max-width:640px){
.ar-hud{font-size:9px;letter-spacing:.12em}
.ar-hud-tl,.ar-hud-bl{left:14px}.ar-hud-tr,.ar-hud-br{right:14px}
.ar-hud-br{display:none}
}
@media (prefers-reduced-motion:reduce){
.is-boot .ar-scan,.is-live .ar-rec,.is-boot .ar-hud-tr b,.is-logged .ar-s-done .ar-ms,.is-logged .ar-s-done .ar-tag{animation:none}
}
/* 3D lab floor inside every panel */
.ar-floor{position:absolute;left:-60%;right:-60%;bottom:0;height:62%;z-index:0;pointer-events:none;opacity:.7;
background:linear-gradient(rgba(92,225,240,.14) 1px,transparent 1px) 0 0/64px 64px,linear-gradient(90deg,rgba(92,225,240,.14) 1px,transparent 1px) 0 0/64px 64px;
transform:perspective(380px) rotateX(64deg);transform-origin:50% 100%;
-webkit-mask-image:linear-gradient(to top,#000 0,rgba(0,0,0,.6) 45%,transparent 92%);mask-image:linear-gradient(to top,#000 0,rgba(0,0,0,.6) 45%,transparent 92%)}
.ar-floor::after{content:"";position:absolute;left:0;right:0;top:8%;height:2px;background:linear-gradient(90deg,transparent,rgba(92,225,240,.5),transparent);filter:blur(1px)}
.is-live .ar-floor{animation:ar-floor 2.4s linear infinite}
[data-state="go"] .ar-floor{opacity:0}
.has-hud .ar-grid{opacity:.6}

/* Lab feed beside the panel */
.ar.has-feed{display:grid;grid-template-columns:minmax(0,1fr) clamp(250px,23vw,310px);column-gap:14px;align-items:stretch}
.ar.has-feed>*{grid-column:1}
.ar.has-feed>.ar-feed{grid-column:2;grid-row:1/span 2}
.ar-feed{display:flex;flex-direction:column;min-width:0;background:var(--panel);box-shadow:inset 0 0 0 1px var(--line);clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,18px 100%,0 calc(100% - 18px))}
.ar-feed-top{display:flex;justify-content:space-between;gap:10px;padding:12px 16px;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--soft);border-bottom:1px solid var(--line)}
.ar-feed-top span:first-child{display:flex;align-items:center;gap:8px}
.ar-feed-top span:last-child{color:var(--cyan)}
.ar-feed-top .ar-rec{background:var(--red);box-shadow:0 0 8px var(--red);animation:ar-blink 1.1s steps(2,end) infinite}
.ar-feed-video{position:relative;flex:1 1 auto;min-height:170px;overflow:hidden;background:#0C0D10}
.ar-feed-video video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.ar-feed-video::after{content:"";position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(0deg,rgba(255,255,255,.03) 0 1px,transparent 1px 3px),linear-gradient(180deg,transparent 60%,rgba(12,13,16,.7))}
.ar-feed-video .mg-corners{inset:10px;--k:var(--cyan)}
.ar-feed-tag{position:absolute;left:14px;bottom:12px;z-index:2;padding:4px 8px;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:#0C0D10;background:var(--cyan)}
.ar-feed-cap{margin:0;padding:14px 16px 12px;font-size:15px;line-height:1.4;color:var(--soft)}
.ar-feed-cap b{color:var(--acc)}
.ar-feed-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:0;border-top:1px solid var(--line)}
.ar-feed-stats div{display:flex;flex-direction:column;gap:4px;padding:12px 14px;min-width:0}
.ar-feed-stats div+div{border-left:1px solid var(--line)}
.ar-feed-stats dt{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:9px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.ar-feed-stats dd{margin:0;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:13px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media (max-width:900px){
.ar.has-feed{grid-template-columns:1fr}
.ar.has-feed>.ar-feed{grid-column:1;grid-row:auto;margin-top:14px;display:grid;grid-template-columns:minmax(0,44%) minmax(0,1fr);grid-template-rows:auto 1fr auto}
.ar-feed-top{grid-column:1/-1}
.ar-feed-video{grid-row:2/span 2;min-height:150px}
.ar-feed-cap{align-self:center}
.ar-feed-stats{grid-template-columns:1fr 1fr 1fr}
}
@media (max-width:520px){.ar-feed-stats div{padding:10px 8px}.ar-feed-cap{font-size:14px;padding:12px}}
@media (prefers-reduced-motion:reduce){.is-live .ar-floor,.ar-feed-top .ar-rec{animation:none}}
@keyframes ar-floor{to{background-position:0 64px,0 64px}}
@keyframes ar-sweep{0%{opacity:1;transform:translateY(-100%)}85%{opacity:1}100%{opacity:0;transform:translateY(165%)}}
@keyframes ar-edge-hit{0%{box-shadow:inset 0 0 0 2px var(--acc),inset 0 0 60px rgba(200,245,90,.35)}100%{box-shadow:inset 0 0 0 1px rgba(200,245,90,.10),inset 0 0 80px rgba(0,0,0,.55)}}
@keyframes ar-edge-miss{0%{box-shadow:inset 0 0 0 2px var(--red),inset 0 0 70px rgba(255,77,46,.35)}100%{box-shadow:inset 0 0 0 1px rgba(200,245,90,.10),inset 0 0 80px rgba(0,0,0,.55)}}
@keyframes ar-shake{20%{transform:translateX(-6px)}40%{transform:translateX(5px)}60%{transform:translateX(-3px)}80%{transform:translateX(2px)}}
@keyframes ar-land{0%{opacity:0;transform:scale(1.5);filter:blur(6px)}100%{opacity:1;transform:none;filter:none}}
@keyframes ar-type{0%{clip-path:inset(0 100% 0 0)}100%{clip-path:inset(0 0 0 0)}}

@keyframes ar-spin{to{transform:rotate(360deg)}}
@keyframes ar-blink{50%{opacity:.25}}
@keyframes ar-flash{0%{filter:brightness(1.6)}100%{filter:none}}

/* Reaction: the signal reactor behind the panel text. Cyan at rest, red when armed,
   a dark shockwave on green, lime once a try is logged. */
.ar-reactor{--rc:92,225,240;position:absolute;left:50%;top:50%;z-index:1;height:84%;aspect-ratio:1;transform:translate(-50%,-50%);pointer-events:none;transition:opacity .3s}
.ar-reactor i,.ar-reactor b{position:absolute;inset:0;border-radius:50%}
.ar-reactor i:nth-child(1){border:2px dashed rgba(var(--rc),.26);animation:ar-spin 40s linear infinite}
.ar-reactor i:nth-child(2){inset:11%;border:2px solid rgba(var(--rc),.12);border-top-color:rgba(var(--rc),.75);border-right-color:rgba(var(--rc),.35);filter:drop-shadow(0 0 6px rgba(var(--rc),.5));animation:ar-spin 5s linear infinite reverse}
.ar-reactor i:nth-child(3){inset:25%;border:1px solid rgba(var(--rc),.18);background:radial-gradient(circle,rgba(var(--rc),.16),rgba(var(--rc),.03) 55%,transparent 70%);animation:ar-core 3s ease-in-out infinite}
.ar-reactor b{inset:-3%;background:repeating-conic-gradient(rgba(var(--rc),.45) 0 .7deg,transparent .7deg 7.5deg);-webkit-mask:radial-gradient(circle,transparent 64%,#000 64.5%,#000 68%,transparent 68.5%);mask:radial-gradient(circle,transparent 64%,#000 64.5%,#000 68%,transparent 68.5%)}
.ar-reactor::after{content:"";position:absolute;inset:25%;border-radius:50%;border:8px solid rgba(12,13,16,.45);opacity:0}
[data-state="wait"] .ar-reactor{--rc:255,77,46}
[data-state="wait"] .ar-reactor i:nth-child(2){animation-duration:1.1s}
[data-state="wait"] .ar-reactor i:nth-child(3){animation-duration:.8s}
[data-state="go"] .ar-reactor{--rc:12,13,16}
[data-state="go"] .ar-reactor::after{animation:ar-shock .55s cubic-bezier(.2,.7,.3,1) both}
[data-state="early"] .ar-reactor{--rc:255,77,46;opacity:.6}
[data-state="hit"] .ar-reactor,[data-state="done"] .ar-reactor{--rc:200,245,90}
[data-state="done"] .ar-reactor{opacity:.55}
@keyframes ar-core{50%{transform:scale(1.06);opacity:.7}}
@keyframes ar-shock{0%{transform:scale(.3);opacity:1}100%{transform:scale(2.4);opacity:0}}

/* Packing: bevelled blocks, a crate with rulers, and a moving conveyor under the pieces */
.pk-board{position:relative;background:#1A1D23;box-shadow:0 0 0 2px #3A3F4A,0 0 0 9px #14161B,0 0 0 10px rgba(92,225,240,.28),0 18px 40px rgba(0,0,0,.5)}
.pk-board::before,.pk-board::after{content:"";position:absolute;pointer-events:none}
.pk-board::before{left:3px;right:3px;top:-19px;height:6px;background:repeating-linear-gradient(90deg,rgba(92,225,240,.7) 0 1px,transparent 1px calc(var(--cell) + 3px))}
.pk-board::after{top:3px;bottom:3px;left:-19px;width:6px;background:repeating-linear-gradient(180deg,rgba(92,225,240,.7) 0 1px,transparent 1px calc(var(--cell) + 3px))}
.pk-cell{background-color:#0C0D10;background-image:radial-gradient(circle,rgba(92,225,240,.22) 1.4px,transparent 2px),linear-gradient(145deg,rgba(255,255,255,.03),transparent 60%)}
.pk-cell.is-full,.pk-sq{background-image:linear-gradient(150deg,rgba(255,255,255,.34),rgba(255,255,255,.06) 42%,rgba(0,0,0,.22));box-shadow:inset 2px 2px 0 rgba(255,255,255,.35),inset -2px -3px 0 rgba(0,0,0,.35)}
.pk-cell.is-full{animation:pk-drop .22s cubic-bezier(.2,1.5,.4,1)}
.pk-cell.is-ghost{box-shadow:inset 0 0 0 2px var(--acc),0 0 14px rgba(200,245,90,.45)}
.pk-cell.is-bad{box-shadow:inset 0 0 0 2px var(--red)}
.pk-tray{padding:12px;background:repeating-linear-gradient(90deg,#15171C 0 18px,#1A1D23 18px 36px);background-size:36px 100%;box-shadow:inset 0 0 0 1px #2A2E37,inset 0 6px 10px rgba(0,0,0,.45);animation:pk-belt 1.6s linear infinite}
.pk-piece{background:rgba(27,30,36,.92);transition:transform .15s,box-shadow .15s}
.pk-piece:hover{transform:translateY(-2px)}
.pk-piece.is-sel{transform:translateY(-3px);box-shadow:inset 0 0 0 2px var(--acc),0 8px 18px rgba(200,245,90,.18)}
.ar-pk.is-packed .pk-board{box-shadow:0 0 0 2px var(--acc),0 0 0 9px #14161B,0 0 0 10px var(--acc),0 0 40px rgba(200,245,90,.35)}
@keyframes pk-drop{0%{transform:scale(1.18);filter:brightness(1.5)}100%{transform:none;filter:none}}
@keyframes pk-belt{to{background-position:36px 0}}
@media (prefers-reduced-motion:reduce){.ar-reactor i,.ar-reactor::after,.pk-cell.is-full,.pk-tray{animation:none!important}}
.pk-boxwrap{padding:0 0 10px 24px}
.pk-boxwrap .pk-label{margin-bottom:28px}
@media (max-width:760px){.pk-boxwrap{padding-left:12px}.pk-board::after{display:none}.pk-board{--cell:min(calc((100vw - 140px) / 6),52px)}}