.runner { position: relative; max-width: 800px; margin: 12px auto 14px; border-radius: 18px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 20px 50px -24px rgba(0, 0, 0, 0.7); cursor: pointer; touch-action: none; }
.runner canvas { display: block; width: 100%; }
.tip { text-align: center; color: var(--muted); font-size: 13px; margin: 0 0 10px; }