/* Focused experiment workspace using the restored BrainSNN homepage palette. */
#experiment-root{color:var(--bh-text,#f4f7fb);padding:28px 0 32px;font-family:var(--brain-font,Inter,system-ui,sans-serif)}
#experiment-root [hidden]{display:none!important}
#experiment-root :is(button,a,input,select):focus-visible{outline:2px solid var(--bh-cyan,#68eaff);outline-offset:4px}
#experiment-heading:focus-visible{outline:2px solid var(--bh-cyan,#68eaff);outline-offset:6px;border-radius:3px}
.experiment-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:22px}
.experiment-heading h2{font-size:clamp(24px,3.1vw,36px);letter-spacing:-.045em;font-weight:600;line-height:1.18}
.experiment-heading p{color:var(--bh-muted,#99a6b7);margin-top:9px;font-size:14px;max-width:680px}
.experiment-kicker{font-size:10px;font-weight:650;letter-spacing:.12em;color:var(--bh-cyan,#68eaff);margin-bottom:9px}
.experiment-selection{display:grid;grid-template-columns:minmax(170px,1fr) minmax(180px,1.15fr) minmax(180px,1.2fr) 100px;gap:12px;padding:18px;background:var(--bh-panel,#0b1018);border:1px solid var(--bh-line);border-radius:18px}
.experiment-selection label{display:flex;flex-direction:column;gap:7px;font-size:11px;font-weight:600;color:var(--bh-muted)}
.experiment-selection select,.experiment-selection input{width:100%;min-width:0;height:45px;background:#111925;border:1px solid rgba(255,255,255,.13);border-radius:10px;padding:0 12px;color:var(--bh-text);font:14px/1.4 var(--brain-font);outline-offset:3px}
.experiment-selection select{padding-right:25px}
.experiment-selection select:focus-visible,.experiment-selection input:focus-visible{outline:2px solid var(--bh-cyan)}
.experiment-selection-status{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:11px 4px 17px;color:var(--bh-muted);font-size:11px}
.experiment-pair-status{color:var(--bh-cyan)}
.experiment-selection-note{padding:0 3px 16px;font-size:12px;color:var(--bh-muted)}
.experiment-error{padding:14px 16px;border:1px solid #947cff60;border-radius:12px;background:#947cff0b;color:#d7ceff;margin-bottom:18px;font-size:13px;line-height:1.6}
.experiment-error button{display:block;margin-top:9px;color:var(--bh-cyan)}
.experiment-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px;align-items:start}
.experiment-main{min-width:0;overflow:hidden;border:1px solid var(--bh-line);border-radius:20px;background:var(--bh-panel)}
.experiment-tabs{display:flex;gap:5px;padding:12px;border-bottom:1px solid var(--bh-line)}
.experiment-tabs button{min-height:40px;background:transparent;border:1px solid transparent;padding:9px 16px;border-radius:10px;color:var(--bh-muted);font-size:13px;font-weight:550}
.experiment-tabs button.active{background:#68eaff12;color:var(--bh-cyan);border-color:#68eaff26}
.experiment-tabs button:hover:not(:disabled){color:var(--bh-text);background:#ffffff06}
.experiment-tabs button:disabled{opacity:.42}
.experiment-viewer-top{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:77px;padding:15px 19px;background:#0d131e}
.experiment-viewer-top strong{display:block;font-size:15px;font-weight:600}
.experiment-viewer-top>div>span{display:block;color:var(--bh-muted);font-size:11px;margin-top:4px}
.experiment-viewer-top>div:last-child{display:flex;gap:15px;align-items:center}
#experiment-viewer{display:block;width:100%;height:clamp(430px,47vw,650px);border:0;background:#171a1f}
.experiment-viewer-bottom{padding:13px 19px 16px;border-top:1px solid var(--bh-line)}
.experiment-viewer-bottom p{font-size:11px;line-height:1.6;color:var(--bh-muted)}
.experiment-viewer-bottom p:first-child{color:#cbd5e3;margin-bottom:4px}
.experiment-readiness{padding:24px 20px;background:var(--bh-panel);border:1px solid var(--bh-line);border-radius:20px}
.experiment-readiness h3{font-size:19px;font-weight:600;line-height:1.35;letter-spacing:-.035em}
.experiment-checklist{list-style:none;margin:24px 0;padding:0;display:flex;flex-direction:column;gap:21px}
.experiment-checklist li{display:flex;align-items:flex-start;gap:11px}
.experiment-check{display:grid;place-items:center;flex:0 0 24px;height:24px;border:1px solid #ffffff28;border-radius:50%;font-size:11px;color:var(--bh-muted)}
.experiment-check.available{border-color:#68eaff47;background:#68eaff0d;color:var(--bh-cyan)}
.experiment-checklist strong{display:block;font-size:12px;font-weight:600;line-height:1.6}
.experiment-checklist small{display:block;color:var(--bh-muted);font-size:11px;line-height:1.65;margin-top:3px;overflow-wrap:anywhere}
.experiment-run-area{padding-top:20px;border-top:1px solid var(--bh-line);margin-bottom:15px}
.experiment-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;border:1px solid #ffffff20;border-radius:11px;padding:11px 16px;background:#ffffff05;color:var(--bh-text);font-size:12px;font-weight:600}
.experiment-readiness>.experiment-button,.experiment-run-area>.experiment-button{width:100%}
.experiment-button.primary{background:var(--bh-cyan);color:#041016;border-color:var(--bh-cyan)}
.experiment-button:disabled{opacity:.42;cursor:not-allowed}
.experiment-run-area p{font-size:11px;line-height:1.6;color:var(--bh-muted);margin-top:9px}
.experiment-text-button{padding:7px 0;min-height:35px;flex-shrink:0;border:0;background:none;color:var(--bh-cyan);font-size:12px;text-align:left}
.experiment-link{display:inline-flex;align-items:center;gap:5px;color:var(--bh-cyan);font-size:12px;line-height:1.6;min-height:32px}
.experiment-link:hover,.experiment-text-button:hover{text-decoration:underline;text-underline-offset:4px}
.experiment-link span{opacity:.75}
.experiment-source-links{display:flex;flex-direction:column;align-items:flex-start;gap:7px;margin-top:19px;padding-top:16px;border-top:1px solid var(--bh-line)}
.experiment-demo-option{margin-top:20px;padding:14px 0 0;border-top:1px solid var(--bh-line)}
.experiment-demo-option p{font-size:11px;line-height:1.65;color:var(--bh-muted)}
.experiment-demo-option button{font-size:11px}
.experiment-setup-copy{padding:30px;max-width:950px}
.experiment-setup-copy>h3{font-size:29px;font-weight:600;letter-spacing:-.035em}
.experiment-setup-copy>p{font-size:14px;color:var(--bh-muted);line-height:1.7;margin-top:9px}
.experiment-callout{padding:16px 18px;background:#947cff0b;border:1px solid #947cff32;border-radius:13px;margin:23px 0;color:#e0d8ff}
.experiment-callout strong{font-size:13px;font-weight:600}
.experiment-callout p{font-size:12px;line-height:1.7;margin-top:7px;color:#b5adc7}
.experiment-setup-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px 30px;margin-top:25px}
.experiment-setup-grid h4{font-size:12px;font-weight:600;margin:0 0 10px}
.experiment-setup-grid p,.experiment-setup-grid li{font-size:12px;line-height:1.8;color:var(--bh-muted)}
.experiment-setup-grid ol{margin:0;padding-left:18px}
.experiment-setup-grid li{padding-left:4px;margin-bottom:5px}
.experiment-empty{min-height:420px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px;gap:15px}
.experiment-empty-symbol{display:grid;place-items:center;width:62px;height:62px;border:1px solid #68eaff38;border-radius:18px;color:var(--bh-cyan);font-size:27px;background:#68eaff08;margin-bottom:8px}
.experiment-empty h3{font-size:25px;font-weight:550}
.experiment-empty p{max-width:380px;color:var(--bh-muted);font-size:13px;line-height:1.8}
.experiment-demo-banner{display:flex;flex-direction:column;gap:5px;padding:15px 18px;border:1px solid #68eaff30;background:#68eaff09;border-radius:12px}
.experiment-demo-banner strong{font-size:13px;font-weight:600;color:var(--bh-cyan)}
.experiment-demo-banner span{color:var(--bh-muted);font-size:12px;line-height:1.6}
@media(max-width:1100px){.experiment-selection{grid-template-columns:1fr 1fr}.experiment-seed-label{max-width:160px}.experiment-layout{grid-template-columns:minmax(0,1fr) 280px}.experiment-readiness{padding:22px 17px}.experiment-setup-grid{grid-template-columns:1fr}.experiment-heading{align-items:flex-start}}
@media(max-width:820px){.experiment-layout{grid-template-columns:1fr}.experiment-readiness{display:grid;grid-template-columns:1fr 1fr;gap:0 22px}.experiment-readiness>.experiment-kicker,.experiment-readiness>h3{grid-column:1/-1}.experiment-checklist{grid-column:1;grid-row:3/7}.experiment-run-area{grid-column:2;margin-top:24px}.experiment-readiness>.experiment-button,.experiment-readiness>.experiment-source-links,.experiment-demo-option{grid-column:2}.experiment-viewer-top{padding:15px}.experiment-setup-grid{grid-template-columns:1fr 1fr}#experiment-viewer{height:510px}}
@media(max-width:560px){#experiment-root{padding-top:24px}.experiment-heading{display:block;margin-bottom:20px}.experiment-heading>button{margin-top:12px}.experiment-heading p{font-size:13px;line-height:1.65}.experiment-selection{gap:13px 10px;padding:14px;border-radius:15px}.experiment-selection label{font-size:10px}.experiment-selection input,.experiment-selection select{font-size:13px;padding:0 10px;min-height:45px}.experiment-task-label{grid-column:1}.experiment-seed-label{grid-column:2;max-width:none}.experiment-selection-status{font-size:10px;align-items:flex-start}.experiment-selection-status>span:last-child{white-space:nowrap}.experiment-main{border-radius:16px}.experiment-tabs{padding:9px}.experiment-tabs button{font-size:12px;padding:9px 12px;min-height:42px}.experiment-viewer-top{align-items:flex-start;gap:10px}.experiment-viewer-top>div:last-child{flex-direction:column;align-items:flex-end;gap:0}.experiment-viewer-top .experiment-link,.experiment-viewer-top .experiment-text-button{font-size:10px;min-height:26px;padding:0}#experiment-viewer{height:470px}.experiment-viewer-bottom{padding:12px 14px}.experiment-viewer-bottom p{font-size:10px}.experiment-readiness{display:block;padding:23px 20px;border-radius:16px}.experiment-checklist{gap:18px}.experiment-readiness h3{font-size:20px}.experiment-setup-copy{padding:24px 19px}.experiment-setup-grid{grid-template-columns:1fr;gap:23px}.experiment-setup-copy>h3{font-size:27px}.experiment-empty{min-height:340px;padding:35px 22px}.experiment-button{min-height:46px}.experiment-error{font-size:12px}.experiment-demo-banner{padding:14px}}

/* The arena owns the main stage; details stay in their dedicated tabs. */
.experiment-arena-layout{display:block}.experiment-arena-layout>.experiment-main{overflow:visible;background:transparent}.experiment-arena-layout .experiment-tabs{border-radius:19px 19px 0 0;background:var(--bh-panel)}
#experiment-root .experiment-heading{margin-bottom:18px}#experiment-root .experiment-heading h2{font-size:clamp(25px,3vw,38px)}
@media(min-width:1000px){#experiment-root{padding-top:22px}.experiment-selection{padding:12px 16px}.experiment-selection select,.experiment-selection input{height:41px}.experiment-selection-status{padding-bottom:12px}}

.legacy-campaign{margin-top:28px;border:1px solid var(--bh-line);border-radius:18px;padding:18px}.legacy-campaign>summary{color:var(--bh-muted);cursor:pointer;min-height:32px;font-size:13px}.legacy-campaign[open]>summary{margin-bottom:24px}
/* Site testing is a first-class destination in the existing arena. */
.experiment-tabs{flex-wrap:wrap}
.experiment-new{display:inline-block;font-size:8px;font-weight:750;letter-spacing:.09em;color:#68eaff;background:#68eaff10;border:1px solid #68eaff32;border-radius:4px;padding:2px 4px;margin-left:5px;vertical-align:middle}
.experiment-site-entry{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 22px;margin:0 0 16px;border:1px solid #68eaff25;border-radius:14px;background:linear-gradient(115deg,#68eaff08,#947cff08)}
.experiment-site-entry strong{display:block;font-size:15px;font-weight:550;color:#f4f7fb;letter-spacing:-.02em}
.experiment-site-entry span{display:block;font-size:12px;color:#98a8bd;margin-top:5px;line-height:1.5}
.experiment-site-entry .experiment-button{flex-shrink:0;min-height:44px}
@media(max-width:640px){.experiment-site-entry{align-items:flex-start;flex-direction:column;padding:16px}.experiment-site-entry .experiment-button{width:100%}.experiment-tabs{gap:4px}.experiment-tabs button{font-size:11px;padding:10px 12px}}

/* Public navigation stays small; only completed-run replay is progressive. */
[data-arena-after-run][hidden]{display:none!important}
.app-nav a{display:inline-flex;align-items:center;justify-content:center;text-decoration:none}
.arena-overflow{position:relative;font-size:13px}
.arena-overflow summary{padding:10px;cursor:pointer;color:#99a6b7}
.arena-overflow-links{position:absolute;right:0;top:100%;z-index:30;display:flex;flex-direction:column;min-width:155px;padding:7px;border:1px solid #283447;border-radius:10px;background:#101620;box-shadow:0 12px 28px #0005}
.arena-overflow-links a,.arena-overflow-links button{display:block;padding:12px 16px;color:#68eaff;text-decoration:none;border-radius:6px;text-align:left;font-size:12px;min-height:44px}
.arena-overflow-links a:hover,.arena-overflow-links button:hover{background:#68eaff0b}
.arena-tools{display:flex;align-items:center;flex-wrap:wrap;gap:8px;padding-top:18px}
.arena-tools a{text-decoration:none}
.arena-tools .nav-tab{font-size:12px;min-height:40px}
@media(max-width:560px){.app-header{gap:10px}.app-nav .nav-tab{font-size:12px;padding:10px}.brand-label small{display:none}.arena-overflow summary{font-size:12px;padding:7px}.arena-tools{gap:4px}}

/* Choose a body and a brain before running; the playful controls are the product. */
.experiment-heading h2 span{color:#b6a0ff}.experiment-selection{background:linear-gradient(110deg,#101e2b,#171a2d);border-color:#3b4b66;box-shadow:0 8px 35px #0002}.experiment-robot-picker>span{color:#89edf1}.experiment-model-picker>span{color:#c6adff}.experiment-robot-picker select{border-color:#4c8b91}.experiment-model-picker select{border-color:#79639e}.experiment-selection label>span{font-size:12px;letter-spacing:.01em}.experiment-selection-status{font-size:12px}.experiment-tabs button{min-height:44px}.experiment-site-entry{margin:8px 14px 18px}.arena-tools .nav-tab.active{background:#947cff14;border-color:#947cff40;color:#d5c4ff}
@media(max-width:560px){.experiment-heading h2 span{display:inline}.experiment-selection{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px}.experiment-selection select,.experiment-selection input{font-size:16px;padding:0 8px}.experiment-selection label>span{font-size:11px}.experiment-selection-status{flex-direction:column;gap:5px}.experiment-selection-status>span:last-child{white-space:normal}.experiment-heading p{line-height:1.5}.experiment-site-entry{margin:8px 10px 16px}.arena-tools{gap:5px}.arena-tools .nav-tab{font-size:11px;padding:8px}}

@media(min-width:1280px){#experiment-root.experiment-playground{display:grid;grid-template-columns:240px minmax(0,1fr);grid-template-rows:auto auto auto auto auto 1fr;column-gap:20px;align-items:start}.experiment-playground>.experiment-heading{grid-column:1/-1}.experiment-playground>.experiment-selection{grid-column:1;grid-row:2;grid-template-columns:1fr;padding:18px;gap:18px}.experiment-playground>.experiment-selection .experiment-seed-label{max-width:none}.experiment-playground>.experiment-selection-status{grid-column:1;grid-row:3;flex-direction:column;align-items:flex-start;gap:8px;padding:14px 6px}.experiment-playground>.experiment-error{grid-column:1;grid-row:4}.experiment-playground>.experiment-selection-note{grid-column:1;grid-row:5}.experiment-playground>.experiment-layout{grid-column:2;grid-row:2/7}.experiment-playground .arena-main{grid-template-columns:minmax(0,1fr) 250px}.experiment-playground .arena-panel-section{padding:18px 14px}.experiment-playground .arena-pair>strong{font-size:12px}.experiment-playground .arena-session-bar{padding:14px;gap:12px;flex-wrap:wrap}.experiment-playground .arena-profile-bar{padding:8px 10px 16px}.experiment-playground .arena-profile-bar>span{font-size:11px}.experiment-playground .arena-mission-picks button{grid-template-columns:18px 1fr;align-items:center;padding:10px}.experiment-playground .arena-mission-picks small{display:none}.experiment-playground .arena-mission-picks button>span{grid-row:auto}.experiment-playground .arena-transport-note,.experiment-playground .arena-camera-controls>span{display:none}}

@media(max-width:760px){.arena-tools,.experiment-tabs{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:thin}.arena-tools .nav-tab,.experiment-tabs button{flex-shrink:0;white-space:nowrap}.arena-tools{padding-bottom:5px}.experiment-tabs{padding:8px}.experiment-heading>button{margin-top:5px;min-height:28px}.experiment-heading p{margin-top:6px}.experiment-heading{margin-bottom:14px!important}}

/* Customer entry stays on the arcade and packs; setup utilities remain available. */
.experiment-more-tools>summary{display:flex;align-items:center;min-height:44px;padding:10px 14px;color:var(--bh-muted,#99a6b7);font-size:12px;cursor:pointer;list-style:none;border-radius:10px}
.experiment-more-tools>summary::-webkit-details-marker{display:none}
.experiment-more-tools>summary::after{content:'+';margin-left:12px;color:var(--bh-cyan,#68eaff)}
.experiment-more-tools[open]>summary::after{content:'−'}
.experiment-tabs{align-items:flex-start;flex-wrap:wrap;overflow:visible}
.experiment-more-tools{flex:1;min-width:0}
.experiment-more-tools>summary{width:max-content;max-width:100%}
.experiment-tool-options{display:flex;flex-wrap:wrap;gap:5px;padding:6px 0 8px}
.experiment-tool-options .experiment-text-button{padding:9px 16px;color:var(--bh-muted)}
.experiment-tool-options p{flex-basis:100%;padding:5px 16px;color:var(--bh-muted);font-size:11px;line-height:1.6;max-width:650px}
.experiment-more-tools>summary:focus-visible{outline:2px solid var(--bh-cyan,#68eaff);outline-offset:3px}
@media(max-width:760px){.arena-tools{flex-wrap:wrap;overflow:visible}.experiment-tool-options{margin-left:-4px}.experiment-tool-options button{font-size:11px;padding:9px 10px}.experiment-tool-options p{padding:5px 10px}}
/* Hash links open a workspace with its single navigation still in view. */
.workspace-page{scroll-margin-top:160px}
/* A real-physics challenge inside the existing arcade, without another nav. */
.deformable-entry{display:flex;justify-content:space-between;align-items:center;gap:18px;border:1px solid #47d9e84a;background:linear-gradient(110deg,#0b202a,#121428);border-radius:18px;padding:16px 20px;margin:0 0 22px;text-decoration:none;color:#dffbff}
.deformable-entry strong{display:block;font-size:16px}.deformable-entry small{display:block;margin-top:5px;line-height:1.5;color:#a8b9cd}.deformable-entry>span:last-child{font-weight:700;white-space:nowrap;color:#63e9f5}.deformable-entry:hover{border-color:#62e2f5}.deformable-entry:focus-visible{outline:3px solid #ad95ff;outline-offset:4px}
@media(max-width:600px){.deformable-entry{padding:14px;gap:12px;margin-bottom:16px}.deformable-entry small{font-size:12px}.deformable-entry>span:last-child{font-size:13px}}