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button.is-active{background:var(--overlay-accent);color:var(--overlay-accent-text);border-color:var(--overlay-accent);transform:translateY(-1px)}.overlay-control--text{display:flex;width:100%;height:100%;padding:0;color:var(--overlay-text)}.overlay-control--toggle{display:flex;width:100%;height:100%;box-sizing:border-box;align-items:center;justify-content:flex-start;gap:12px;padding:10px;position:relative}.overlay-control--toggle.is-compact{justify-content:center;gap:0}.overlay-control--toggle input[type=checkbox]{position:absolute;opacity:0;pointer-events:none}.overlay-control--toggle-track{width:44px;height:24px;border-radius:var(--overlay-radius-pill);padding:2px;background:var(--overlay-track);border:1px solid var(--overlay-border);transition:background .12s ease}.overlay-control--toggle-track.is-on{background:var(--overlay-accent);border-color:var(--overlay-accent)}.overlay-control--toggle-thumb{display:block;width:18px;height:18px;border-radius:var(--overlay-radius-pill);background:var(--overlay-thumb);box-shadow:0 1px 2px var(--overlay-focus-ring);transform:translate(0);transition:transform .12s ease}.overlay-control--toggle-track.is-on .overlay-control--toggle-thumb{transform:translate(20px)}.overlay-control--toggle-copy{min-width:0;flex:1 1 auto;display:flex;flex-direction:column;align-items:flex-start}.overlay-control--toggle-copy small{font-size:.68rem;color:var(--overlay-text-muted)}.overlay-control--tooltip{position:relative;display:grid;place-items:center;width:100%;height:100%;box-sizing:border-box;padding:4px}.overlay-control--tooltip-target{border-radius:var(--overlay-radius-sm);border:1px dashed var(--overlay-border-strong);padding:4px 8px;font-size:.92em;line-height:1.35;background:color-mix(in srgb,var(--overlay-surface) 86%,transparent)}.overlay-control--tooltip-bubble{position:absolute;max-width:220px;background:var(--overlay-surface);border:1px solid var(--overlay-border);border-radius:var(--overlay-radius-sm);padding:6px 8px;font-size:.92em;line-height:1.45;white-space:nowrap;pointer-events:none;box-shadow:var(--overlay-shadow);transform-origin:center center;transition:opacity .18s ease,transform .18s ease}.overlay-control--tooltip.is-top .overlay-control--tooltip-bubble{left:50%;bottom:calc(100% + 8px);transform:translate(-50%) scale(.88)}.overlay-control--tooltip.is-right .overlay-control--tooltip-bubble{left:calc(100% + 8px);top:50%;transform:translateY(-50%) scale(.88)}.overlay-control--tooltip.is-bottom .overlay-control--tooltip-bubble{left:50%;top:calc(100% + 8px);transform:translate(-50%) scale(.88)}.overlay-control--tooltip.is-left .overlay-control--tooltip-bubble{right:calc(100% + 8px);top:50%;transform:translateY(-50%) scale(.88)}.overlay-control--tooltip.is-preview .overlay-control--tooltip-bubble{opacity:0}.overlay-control--tooltip.is-preview:hover .overlay-control--tooltip-bubble,.overlay-control--tooltip.is-edit .overlay-control--tooltip-bubble{opacity:1;transform:translate(-50%) scale(1)}.overlay-control--tooltip.is-right.is-preview:hover .overlay-control--tooltip-bubble,.overlay-control--tooltip.is-right.is-edit .overlay-control--tooltip-bubble,.overlay-control--tooltip.is-left.is-preview:hover .overlay-control--tooltip-bubble,.overlay-control--tooltip.is-left.is-edit .overlay-control--tooltip-bubble{transform:translateY(-50%) scale(1)}.overlay-control{--overlay-surface: #ffffff;--overlay-surface-muted: #f8fafc;--overlay-border: rgba(15, 23, 42, .12);--overlay-border-strong: rgba(15, 23, 42, .18);--overlay-text: #0f172a;--overlay-text-muted: #57534e;--overlay-accent: #334155;--overlay-accent-soft: rgba(15, 23, 42, .1);--overlay-accent-text: #ffffff;--overlay-focus-ring: rgba(15, 23, 42, .24);--overlay-track: #cbd5e1;--overlay-thumb: #ffffff;--overlay-radius-sm: 8px;--overlay-radius-md: 10px;--overlay-radius-pill: 999px;--overlay-shadow: 0 8px 20px rgba(15, 23, 42, .08);width:100%;height:100%;border:0;color:var(--overlay-text);background:transparent;font-family:Inter,Segoe UI,Arial,sans-serif;font-size:.82rem;line-height:1.4;-webkit-user-drag:none}.overlay-element.is-hug-x>.overlay-control{width:auto}.overlay-element.is-hug-y>.overlay-control{height:auto}.overlay-control :is(button,input,select,textarea){font:inherit;color:inherit}.overlay-control :is(button,input,select,textarea):focus-visible{outline:2px solid var(--overlay-focus-ring);outline-offset:1px}.viewer-stage{position:relative;overflow:hidden;height:clamp(360px,72svh,860px);border-radius:28px;border:1px solid rgba(121,154,196,.24);background:radial-gradient(circle at top right,rgba(166,213,255,.22),transparent 40%),linear-gradient(180deg,#f1f8fff5,#e3eef9fa);box-shadow:inset 0 1px #ffffffb8,0 28px 60px #1c416e29}.viewer-stage__surface{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%}.viewer-stage__ui-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:2;pointer-events:auto}.viewer-stage__authored{position:absolute;left:0;top:0;transform-origin:left top;pointer-events:auto}.overlay-element{position:absolute;pointer-events:none}.overlay-element.is-hidden{display:none}.overlay-element.is-interactive,.overlay-element.is-interactive *{pointer-events:auto}.river-stage-canvas{display:block;width:100%;height:100%;outline:none}.river-stage-fps{position:absolute;right:16px;bottom:16px;z-index:3;padding:6px 10px;border-radius:999px;background:#0f172ac7;color:#f8fafceb;font-size:.72rem;letter-spacing:.02em;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}@media(max-width:920px){.viewer-stage{height:min(68svh,560px);border-radius:20px}}