:root{color-scheme:dark;font-family:Inter,system-ui,sans-serif;color:#e0eae7;background:#101617;--accent:#bcf568;--muted:#91a6a0}*{box-sizing:border-box}body{margin:0}button,select{font:inherit;color:inherit;background:#192423;border:1px solid #42534d;border-radius:8px;min-height:44px;padding:10px 14px;cursor:pointer}button:hover,select:hover{border-color:var(--accent)}button:focus-visible,select:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}button[aria-pressed=true],#reset{background:var(--accent);color:#13221b;border-color:var(--accent)}button:disabled{opacity:.45;cursor:wait}.shell-header{height:90px;padding:14px 24px;display:flex;align-items:center;gap:24px;border-bottom:1px solid #31413c}.brand{flex:1}.eyebrow,.section-label{font-size:10px;letter-spacing:.15em;font-weight:750;color:var(--accent)}h1{font-size:20px;margin:6px 0 0;font-weight:600}nav{display:flex;gap:8px}nav button{font-weight:650}nav span{font-weight:400}#about-toggle{background:transparent;color:var(--muted)}#about{position:absolute;z-index:20;top:90px;right:20px;width:min(450px,calc(100% - 40px));background:#172321;border:1px solid #4b6258;border-radius:12px;padding:14px 22px;box-shadow:0 12px 40px #0009;font-size:14px;line-height:1.6}a{color:var(--accent)}#simulation{height:calc(100dvh - 90px);position:relative;overflow:hidden}iframe{border:0;width:100%;height:100%;display:block}.b2-stage{height:100%;position:relative}canvas{display:block;width:100%;height:100%;touch-action:none}.stage-label{position:absolute;left:28px;top:26px;pointer-events:none;max-width:300px}h2{font-size:34px;letter-spacing:-.04em;font-weight:550;margin:10px 0}.stage-label p{font-size:12px;color:var(--muted);margin:6px 0}#runtime-label{color:var(--accent)}.controller{position:absolute;right:24px;top:24px;bottom:24px;width:290px;overflow:auto;background:#111b19ed;border:1px solid #3b4a44;border-radius:12px;padding:18px;scrollbar-width:thin}.controller>label{display:block;font-size:12px;color:var(--muted);margin:14px 0 6px}select{width:100%;font-size:12px;padding:8px}.actions{display:flex;gap:8px;margin:16px 0}.actions button{flex:1}.overlay-controls{display:grid;gap:10px;font-size:12px}input{accent-color:var(--accent);width:17px;height:17px;vertical-align:middle}.contacts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0}.foot{padding:8px;border:1px solid #49604c;border-radius:6px;font-size:11px;display:flex;justify-content:space-between}.foot.stance{background:#2e4524;color:#bcf568}.foot.swing{color:#a4bfce;border-color:#516171}details{font-size:12px;border-top:1px solid #36473e;padding-top:12px}summary{cursor:pointer;min-height:35px;display:list-item;align-content:center}dl{display:grid;gap:4px;font-size:11px}dt{color:var(--muted);margin-top:8px}dd{margin:0;font-variant-numeric:tabular-nums}details p,.hint{font-size:11px;line-height:1.5;color:var(--muted)}.warning{font-size:12px;color:#f5c07e;line-height:1.5}.receding{position:absolute;bottom:28px;left:28px;display:flex;align-items:center;gap:12px;font-size:11px;color:var(--muted);padding:12px;border:1px solid #354a3e;border-radius:8px;background:#111b19d9;overflow:hidden}.receding b{color:var(--accent)}.receding i{font-style:normal;color:#678576}#horizon-progress{position:absolute;bottom:0;left:0;height:2px;background:var(--accent);width:0}.error{padding:24px;color:#f6b891}.loading{position:absolute;left:28px;bottom:90px;color:var(--accent)}[hidden]{display:none!important}@media(max-width:700px){.shell-header{height:116px;padding:10px 12px;gap:8px;flex-wrap:wrap}.brand{flex-basis:70%}h1{font-size:16px;margin:3px 0}.eyebrow{font-size:9px}nav{order:3;width:100%;gap:8px}nav button{flex:1;padding:9px 8px;font-size:12px}#about-toggle{font-size:11px;padding:6px 8px;min-height:38px}#about{top:116px}#simulation{height:calc(100dvh - 116px)}.stage-label{left:14px;top:16px;max-width:250px}h2{font-size:23px;margin:6px 0}.stage-label p{font-size:10px}.controller{top:auto;left:12px;right:12px;bottom:12px;width:auto;max-height:44%;padding:10px 12px;background:#111b19f2;display:grid;grid-template-columns:1fr 1fr;gap:6px 10px}.section-label{grid-column:1/-1}.controller>label{display:none}.controller select{min-height:42px;font-size:11px}.actions{margin:0}.overlay-controls{gap:3px;font-size:10px}.contacts{margin:0;gap:4px}.foot{padding:5px;font-size:10px}.controller details{grid-column:1/-1;padding-top:3px}summary{min-height:28px}.hint{grid-column:1/-1;margin:0;font-size:9px}.warning{grid-column:1/-1;margin:0}.receding{left:14px;bottom:240px;gap:8px;padding:8px;font-size:9px;max-width:calc(100% - 28px)}dl{grid-template-columns:1fr 1fr;align-items:start;gap:5px}dt{margin:0}#telemetry[open]~.hint{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

.b2-viewport{position:absolute;inset:0}@media(max-width:700px){.b2-viewport{bottom:270px}.receding{bottom:282px}.stage-label{pointer-events:none}}
@media(max-width:700px) and (max-height:700px){.b2-viewport{bottom:230px}.receding{bottom:238px}.stage-label h2{font-size:19px}.stage-label p{font-size:9px}}

#live-controls{margin:12px 0;font-size:11px}#live-command{color:var(--accent);font-variant-numeric:tabular-nums}.live-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;margin:8px 0}.live-pad button{font-size:20px;touch-action:none;user-select:none}.live-pad button.active{background:var(--accent);color:#142019}#push{width:100%;margin-bottom:8px;font-size:12px}@media(max-width:700px){#live-controls{grid-column:1/-1;margin:0}.live-pad{grid-template-columns:repeat(6,1fr)}.live-pad button{padding:5px;min-height:44px}#push{width:50%;margin:0;padding:6px}#live-controls>label{font-size:9px}.controller:has(#live-controls:not([hidden])){max-height:46%}}
@media(max-width:700px){.b2-stage:has(#live-controls:not([hidden])) .receding{display:none}}

/* Single-controller shell: compact header on mobile, with no mode selector. */
@media(max-width:700px){.shell-header{height:64px;flex-wrap:nowrap}.brand{flex-basis:auto}#about{top:64px}#simulation{height:calc(100dvh - 64px)}}