.stage-physics{background:radial-gradient(circle at 50% 28%,var(--paper),var(--paper-deep) 82%);touch-action:pan-y}
.stage-physics:after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:44px 44px;opacity:.5;mask-image:linear-gradient(to bottom,transparent,black 22%,black 78%,transparent)}
.physics-world{position:absolute;inset:0;z-index:2;overflow:hidden;pointer-events:none}
.physics-world:after{content:"";position:absolute;left:3%;right:3%;bottom:71px;border-top:2px solid var(--ink);opacity:.5;box-shadow:0 6px 15px var(--ink)}
.physics-letter{position:absolute;top:0;left:0;display:block;transform-origin:50% 62%;cursor:grab;touch-action:none;pointer-events:auto;will-change:transform;filter:drop-shadow(0 12px 12px rgba(28,22,17,.23))}
.physics-letter.is-grabbed{z-index:5;cursor:grabbing;filter:drop-shadow(0 22px 24px rgba(28,22,17,.34))}
.physics-letter img{display:block;width:100%;height:100%;pointer-events:none;user-select:none}
.physics-ghost{position:absolute;z-index:1;width:min(66%,690px);height:auto;opacity:.06;pointer-events:none}
.physics-hud{position:absolute;z-index:3;top:32px;left:35px;display:flex;gap:24px;color:var(--muted);font-size:11px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;pointer-events:none}
.stage-physics .stage-caption{z-index:4}
.physics-controls{position:absolute;right:30px;bottom:96px;z-index:6;display:flex;gap:8px;padding:8px;background:var(--paper-glass);border:1px solid var(--line-strong)}
.physics-controls button{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--line-strong);background:var(--paper);color:var(--ink);font-size:24px;cursor:pointer}
.physics-controls button:hover{background:var(--row-hover)}
.physics-controls button:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.physics-trails{position:absolute;inset:0;width:100%;height:100%;z-index:1;pointer-events:none;overflow:hidden}
.physics-trail{fill:none;stroke:var(--ink);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;opacity:.65}
@media(max-width:600px){.physics-controls{right:16px;bottom:93px;gap:5px;padding:5px}.physics-controls button{width:44px;height:44px}.stage-physics .stage-caption{max-width:calc(100% - 36px);font-size:11px}}
@media(max-width:800px){.physics-hud{top:20px;left:22px;gap:12px;font-size:10px}.physics-world:after{bottom:71px}}