/* Shared apparatus HUD; host page typography and dialogs are unaffected. */
#scene-frame{position:relative;overflow:hidden;background:var(--ink)}
#scene-frame [hidden]{display:none!important}
#scene-frame #preparing{position:absolute;inset:0;display:grid;place-content:center;margin:0;background:var(--paper);color:var(--ink);padding:24px;text-align:center}
#scene-frame #retry{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}
/* Compact Printed Workshop controls share the owning lab palette. */
#scene-frame{
 --hud-surface:var(--surface);--hud-text:var(--ink);--hud-muted:var(--muted);
 --hud-line:var(--ink);--hud-hover:var(--hover);
 --hud-focus:var(--focus);--hud-primary:var(--ink);--hud-primary-ink:var(--surface);
 height:clamp(600px,76vh,880px);border-radius:18px;isolation:isolate;
}
.activity-shell{border:0;padding:0;margin:0;background:transparent}
#scene-frame #preparing{z-index:6}#scene-frame #retry{z-index:7}
.scene-hud{position:absolute;inset:0;z-index:2;pointer-events:none;color:var(--hud-text);font-family:Arial,Helvetica,sans-serif}
.hud-surface{background:var(--hud-surface);border:2px solid var(--hud-line);border-radius:2px;box-shadow:3px 3px 0 var(--ink)}
.hud-task{position:absolute;top:14px;left:14px;width:min(340px,calc(100% - 28px));padding:10px 12px}
.hud-task-heading{display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.hud-task h2{font-size:15px;line-height:1.25;font-weight:600;margin:0;color:var(--hud-text)}
.hud-task p{font-size:12px;line-height:1.45;margin:5px 0 0;color:var(--hud-muted);max-width:48ch}
.hud-bottom{position:absolute;bottom:14px;right:14px;max-width:calc(100% - 28px);width:max-content}
.hud-hint{width:fit-content;max-width:100%;padding:6px 10px;margin:0 0 8px;color:var(--hud-text);background:var(--hud-surface);border:1px solid var(--hud-line);border-radius:2px;font-size:11px;line-height:1.4}
.hud-hint:empty{display:none}
.hud-dock{display:flex;align-items:center;gap:3px;padding:4px;pointer-events:auto;position:relative}
.hud-spacer{flex:1;min-width:0}
#scene-frame .scene-hud button,#scene-tools>summary{
 display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:7px 9px;
 color:var(--hud-text);background:transparent;border:1px solid transparent;border-radius:2px;
 font:600 12px/1.3 Arial,Helvetica,sans-serif;box-shadow:none;margin:0;cursor:pointer;
 transition:background-color .15s ease,border-color .15s ease;
}
#scene-frame .scene-hud button:hover:not(:disabled),#scene-tools>summary:hover,#scene-tools[open]>summary{background:var(--hud-hover);border-color:var(--hud-line)}
#scene-frame .scene-hud button:disabled{opacity:.42;cursor:default}
#scene-frame .scene-hud button:focus-visible,#scene-tools>summary:focus-visible,#scene-frame .beam-begin-cue:focus-visible{outline:2px solid var(--hud-focus);outline-offset:2px}
#scene-frame .scene-hud svg{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
#scene-frame .scene-hud .hud-primary{background:var(--hud-primary);color:var(--hud-primary-ink)}
#scene-frame .scene-hud .hud-primary:hover:not(:disabled){background:var(--primary-hover);border-color:var(--ink)}
#scene-frame #back-to-overview{position:static;transform:none}
#scene-tools{position:static;margin:0}
#scene-tools>summary{list-style:none;user-select:none}
#scene-tools>summary::-webkit-details-marker{display:none}
.hud-tools{position:absolute;right:0;bottom:calc(100% + 10px);width:300px;max-width:calc(100vw - 64px);padding:12px;max-height:280px;overflow:auto;overscroll-behavior:contain;scrollbar-color:var(--hud-muted) transparent}
.hud-tools-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}
.hud-tools h3{font-size:14px;font-weight:600;margin:0;color:var(--hud-text)}
#scene-frame #close-scene-tools{padding:6px;min-width:36px;margin:-6px -6px -6px 0}
.hud-tools p{color:var(--hud-muted);font-size:12px;line-height:1.45;margin:6px 0 10px}
.hud-tools .toggle{color:var(--hud-text);font-size:13px;margin:4px 0;min-height:44px}
.hud-tools input[type=checkbox]{accent-color:var(--hud-primary);min-height:18px}
#scene-frame .hud-tools #actions{display:grid;gap:4px}
#scene-frame .hud-tools #actions button{justify-content:flex-start;text-align:left;background:var(--hud-hover)}
#scene-frame .beam-begin-cue{position:absolute;z-index:1;transform:translate(-50%,-100%);min-height:36px;border:1px solid var(--hud-line);border-radius:2px;padding:7px 10px;color:var(--hud-text);background:var(--hud-surface);font:600 12px/1.3 Arial,Helvetica,sans-serif;white-space:nowrap}
#scene-frame .beam-begin-cue:hover{background:var(--hud-hover)}
#background-status:empty{display:none}
@media(max-width:600px){
 #scene-frame{height:640px;border-radius:12px}
 .hud-task{top:12px;left:12px;width:min(320px,calc(100% - 24px));padding:10px 12px}
 .hud-task h2{font-size:14px}.hud-task p{font-size:12px}
 .hud-bottom{bottom:12px;left:auto;right:12px;max-width:calc(100% - 24px)}.hud-dock{flex-wrap:wrap;gap:2px;padding:5px}
 .hud-spacer{display:none}.hud-dock>button{flex:1 1 auto}#scene-tools{margin-left:auto}
 .hud-tools{max-height:300px}.hud-hint{font-size:11px}
 #scene-frame .scene-hud button,#scene-tools>summary{padding:7px 8px;font-size:12px}
}
@media(prefers-reduced-motion:reduce){#scene-frame .scene-hud button,#scene-tools>summary{transition:none}}
@media(pointer:coarse){#scene-frame .scene-hud button,#scene-tools>summary,#scene-frame .beam-begin-cue{min-height:44px}#scene-frame #close-scene-tools{min-width:44px}}

/* Corner overlays share the full scene; HUD content never resizes the canvas. */
#scene-host{position:absolute;inset:0;overflow:hidden}
#scene-host canvas:focus-visible{outline:2px solid var(--hud-focus);outline-offset:-3px}
.hud-dock{width:max-content;max-width:100%;margin-left:auto;flex-wrap:wrap}
.hud-hint{margin-left:auto;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;height:26px}
.hud-hint:empty{display:block;visibility:hidden}

#scene-frame .button-row{display:flex;flex-wrap:wrap;gap:8px}
#scene-frame .toggle{display:flex;gap:8px;align-items:center}
#scene-frame .hud-tools input[type=checkbox]{width:18px;height:18px;padding:0}

#scene-frame #use-caliper{width:100%;justify-content:flex-start;margin-bottom:8px;background:var(--hud-hover)}
#scene-frame #caliper-dimensions{margin-bottom:10px}
#scene-frame #caliper-dimensions button[aria-pressed=true]{background:var(--hud-primary);color:var(--hud-primary-ink,#172638)}
#scene-frame .hud-reading{margin-top:10px;border-top:1px solid var(--hud-line);padding-top:8px}
#scene-frame .hud-reading summary{font-size:12px;min-height:36px;cursor:pointer}
#scene-frame .hud-reading output{display:block;padding:8px 0;font-size:14px;font-variant-numeric:tabular-nums;color:var(--hud-text)}

#scene-frame .hud-reading summary:focus-visible{outline:2px solid var(--hud-focus);outline-offset:2px}

/* Fine rules and ink actions echo the surrounding printed panels. */
.hud-task-heading{padding-bottom:6px;margin-bottom:6px;border-bottom:1px solid var(--rule)}
.hud-tools-heading{padding-bottom:8px;margin-bottom:8px;border-bottom:1px solid var(--rule)}
#scene-frame .hud-tools button{border-color:var(--line)}
#scene-frame .hud-tools button:hover:not(:disabled){border-color:var(--ink)}
#scene-frame #caliper-dimensions button[aria-pressed=true]{border-color:var(--ink)}
#scene-tools[open]>summary{background:var(--selected);border-color:var(--ink)}

/* Primary actions sit near the subject in the two locked activity views. */
.hud-context-action{position:absolute;left:50%;top:68%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:8px;max-width:calc(100% - 32px);width:max-content;pointer-events:none}
.hud-context-action[data-view=dial]{top:auto;bottom:100px}
#scene-frame .hud-context-action button{pointer-events:auto;min-height:44px;padding:11px 18px;font-size:14px;border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);white-space:normal;text-align:center}
#scene-frame .hud-context-action button:active:not(:disabled){box-shadow:1px 1px 0 var(--ink)}
.hud-bottom{z-index:1}
@media(max-width:600px){.hud-context-action{top:65%}.hud-context-action[data-view=dial]{top:auto;bottom:132px}}

/* Anchor the alignment action above the visible beam, clear of its score mark. */
.hud-context-action[data-view=alignment]{left:clamp(132px,var(--alignment-action-x,75%),calc(100% - 132px));top:max(72px,calc(var(--alignment-action-y,26%) - 14px));transform:translate(-50%,-100%);max-width:min(240px,calc(100% - 32px))}

/* Place the button outside the bezel at seven o’clock; its upper-right corner faces the dial. */
.hud-context-action[data-view=dial]{left:calc(var(--dial-action-x,35%) - 12px);top:calc(var(--dial-action-y,78%) + 12px);bottom:auto;transform:translateX(-100%);max-width:min(220px,calc(var(--dial-action-x,35%) - 28px))}

/* Warm copper makes the focal actions distinct from the paper toolbar. */
#scene-frame .hud-context-action .hud-primary{background:var(--scene-action);color:var(--ink);border-color:var(--ink)}
#scene-frame .hud-context-action .hud-primary:hover:not(:disabled){background:var(--scene-action-hover);border-color:var(--ink)}
#scene-frame .hud-context-action .hud-primary:active:not(:disabled){background:var(--scene-action-pressed)}