/* Header mega-menu. Works without JS (native <details>, checkbox drawer); nav.js adds aria sync, Esc, click-outside. */
.site-header .bar{flex-wrap:nowrap;position:relative}
.navtoggle{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}
.burger{display:none;align-items:center;gap:8px;cursor:pointer;font-weight:600;padding:8px 12px;border:1px solid var(--line);border-radius:10px}
.navtoggle:focus-visible+.burger{outline:2px solid var(--brand);outline-offset:2px}
.burger-icon,.burger-icon::before,.burger-icon::after{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;position:relative}
.burger-icon::before,.burger-icon::after{content:"";position:absolute;left:0}.burger-icon::before{top:-6px}.burger-icon::after{top:6px}
.mainnav{display:flex;align-items:center;justify-content:space-between;gap:16px;flex:1;margin-left:20px}
.tabs,.mainnav ul{list-style:none;margin:0;padding:0}
.tabs{display:flex;gap:2px;flex-wrap:wrap}
.dd>summary{list-style:none;cursor:pointer;font-weight:600;padding:8px 10px;border-radius:8px;white-space:nowrap;user-select:none}
.dd>summary::-webkit-details-marker{display:none}
.dd>summary::after{content:"";display:inline-block;margin-left:6px;width:6px;height:6px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:translateY(-3px) rotate(45deg);opacity:.6}
.dd[open]>summary{background:#eef6f5;color:var(--brand-d)}
.dd>summary:hover{color:var(--brand)}
.dd>summary:focus-visible{outline:2px solid var(--brand);outline-offset:1px}
.mega{position:absolute;left:20px;right:20px;top:100%;background:#fff;border:1px solid var(--line);border-radius:0 0 var(--r) var(--r);box-shadow:0 12px 32px rgba(16,24,40,.12);padding:22px 24px;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px 28px;z-index:20}
.mcol-pop{background:#f7faf9;border-radius:10px;padding:12px 14px;grid-column:span 2}
.mtitle{margin:0 0 8px;font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.msub{margin:4px 0 4px;font-weight:700;font-size:.85rem}
.mgroups{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px 18px}
.mega li{margin:2px 0}.mega a{color:var(--ink);text-decoration:none;display:inline-block;padding:3px 0}
.mega a:hover,.mega a:focus-visible{color:var(--brand);text-decoration:underline}
.mhint{display:block;color:var(--muted);font-size:.8rem;line-height:1.3}
.tools{display:flex;gap:4px;margin-left:auto}
.dd-tool{position:relative}.dd-tool>summary{border:1px solid var(--line);font-size:.9rem;padding:6px 10px}
.toolmenu{position:absolute;right:0;top:calc(100% + 6px);background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px rgba(16,24,40,.12);padding:6px;min-width:160px;z-index:21}
.toolmenu a{display:block;padding:6px 10px;border-radius:6px;color:var(--ink);text-decoration:none}
.toolmenu a:hover,.toolmenu a.active{background:#eef6f5;color:var(--brand-d)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.chips{display:flex;gap:6px;flex-wrap:wrap}.chip{background:#eef6f5;color:var(--brand-d);border-radius:999px;padding:2px 10px;font-size:.85rem;font-weight:600}
.fxalt{color:var(--muted);font-weight:500}.small{font-size:.85rem}
.reviewnote{display:inline-block;background:var(--amber);color:var(--amber-t);border-radius:8px;padding:3px 10px;font-size:.8rem;font-weight:600}
.dirlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.catgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.catgrid a{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;font-weight:600;text-decoration:none;color:var(--ink)}
.catgrid a:hover{border-color:var(--brand);color:var(--brand)}
.faq dt{font-weight:700;margin-top:14px}.faq dd{margin:4px 0 0}
@media (max-width:960px){
  .site-header .bar{flex-wrap:wrap}
  .burger{display:inline-flex;margin-left:auto}
  .mainnav{display:none;flex-basis:100%;flex-direction:column;align-items:stretch;margin:6px 0 10px;max-height:calc(100vh - 80px);overflow:auto}
  .navtoggle:checked~.mainnav{display:flex}
  .tabs{flex-direction:column}
  .tab{border-bottom:1px solid var(--line)}
  .dd>summary{display:flex;justify-content:space-between;padding:12px 4px}
  .mega,.toolmenu{position:static;box-shadow:none;border:0;padding:4px 4px 12px;display:block}
  .mcol,.mcol-pop{margin-bottom:12px}
  .tools{margin:8px 0 0;gap:8px}.dd-tool{flex:1}
}