/* Shared rulebook button */
header .rules-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:10px 15px;border:1px solid rgba(255,255,255,.6);border-radius:10px;background:rgba(255,255,255,.1);color:#fff;font:600 15px/1.2 Arial,sans-serif;letter-spacing:0;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background .15s,border-color .15s}
header .rules-button:hover{background:rgba(255,255,255,.22);border-color:#fff}
header .rules-button:focus-visible{outline:3px solid #fff;outline-offset:4px}
.rules-button svg{flex-shrink:0}.rules-format{font-size:10px;letter-spacing:.6px;font-weight:700;opacity:.8;border-left:1px solid rgba(255,255,255,.4);padding-left:9px}
@media(max-width:600px){header .header-inner{gap:14px;flex-wrap:wrap}header .rules-button{padding:10px 12px}.rules-format{display:none}}
@media(prefers-reduced-motion:reduce){header .rules-button{transition:none}}