/* Mercia v26: accessible dropdown navigation; loaded after existing global stylesheet. */
.site-header{overflow:visible}
.header-inner{gap:22px}
.nav.mercia-nav{gap:clamp(12px,1.55vw,26px);font-size:.86rem;white-space:nowrap}
.mercia-nav .nav-group{position:relative;align-self:stretch;display:flex;align-items:center}
.mercia-nav .nav-group>summary{list-style:none;display:flex;gap:9px;align-items:center;cursor:pointer;color:#08294a;font-family:'Manrope',Arial,sans-serif;font-weight:800;padding:29px 0;line-height:1.25;user-select:none}
.mercia-nav .nav-group>summary::-webkit-details-marker{display:none}
.mercia-nav .nav-group>summary:hover,.mercia-nav .nav-group[open]>summary{color:#067cae}
.mercia-nav .nav-group>summary:focus-visible{outline:3px solid #12a8cf;outline-offset:4px}
.mercia-nav .nav-chevron{width:8px;height:8px;border:solid currentColor;border-width:0 2px 2px 0;transform:translateY(-2px) rotate(45deg);transition:transform .18s ease}
.mercia-nav .nav-group[open] .nav-chevron{transform:translateY(2px) rotate(225deg)}
.mercia-nav .nav-dropdown{position:absolute;top:calc(100% - 5px);left:-22px;min-width:265px;max-width:min(90vw,550px);z-index:100;padding:20px 14px 12px;background:#fff;border:1px solid #dde7f0;border-top:3px solid #0faacf;box-shadow:0 18px 48px rgba(4,30,65,.17);border-radius:0 0 10px 10px;white-space:normal}
.mercia-nav .nav-dropdown-wide{width:535px}
.mercia-nav .nav-dropdown-title{font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;color:#37687f;font-weight:800;padding:0 12px 9px}
.mercia-nav .nav-dropdown-columns{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}
.mercia-nav .nav-dropdown a{display:block;color:#18344d;font-size:.86rem;line-height:1.4;font-weight:700;padding:11px 12px;border-radius:5px;transition:background .15s,color .15s}
.mercia-nav .nav-dropdown a:hover,.mercia-nav .nav-dropdown a:focus-visible{background:#e9f7fb;color:#04597d}
.mercia-nav .nav-dropdown .nav-dropdown-bottom{margin-top:9px;padding-top:13px;padding-bottom:10px;border-top:1px solid #dbe8f0;color:#006d95;font-weight:800}
.mercia-nav>a.nav-supplies{display:inline-flex;align-items:center;gap:4px;color:#08294a;font-weight:800;padding:15px 0;white-space:nowrap}
.mercia-nav>a.nav-supplies:hover{color:#067cae}
.mercia-nav>a.nav-contact{display:inline-flex;align-items:center;justify-content:center;gap:7px;white-space:nowrap}
@media(min-width:1101px){.nav.mercia-nav{display:flex}.mercia-nav .nav-group:last-of-type .nav-dropdown{left:auto;right:-24px}}
@media(max-width:1100px){
  .header-inner{min-height:82px}
  .mobile-toggle{display:flex;flex-direction:column;gap:5px;border:0;background:transparent;padding:14px;flex-shrink:0}
  .mobile-toggle span{display:block;height:2px;width:26px;background:#061e45}
  .nav.mercia-nav{display:none;position:absolute;left:0;right:0;top:100%;max-height:calc(100dvh - 140px);overflow-y:auto;background:#fff;box-shadow:0 16px 24px rgba(0,25,50,.17);padding:12px max(22px,calc((100vw - 1240px)/2));flex-direction:column;align-items:stretch;gap:0;white-space:normal;font-size:.96rem}
  .nav.mercia-nav.open{display:flex}
  .mercia-nav .nav-group{display:block;align-self:stretch;border-bottom:1px solid #dce7ef}
  .mercia-nav .nav-group>summary{min-height:50px;padding:14px 0;justify-content:space-between}
  .mercia-nav .nav-dropdown,.mercia-nav .nav-dropdown-wide{position:static;width:100%;min-width:0;max-width:none;box-shadow:none;border:0;border-radius:0;padding:4px 0 12px;background:#f3f8fb}
  .mercia-nav .nav-dropdown-title{padding-top:10px}
  .mercia-nav .nav-dropdown a{padding:12px 14px;min-height:44px}
  .mercia-nav>a.nav-supplies{padding:18px 0;border-bottom:1px solid #dce7ef}
  .mercia-nav>a.nav-contact{margin:18px 0 8px;padding:14px 22px}
}
@media(max-width:580px){.mercia-nav .nav-dropdown-columns{grid-template-columns:1fr}.nav.mercia-nav{max-height:calc(100dvh - 175px)}}
@media(prefers-reduced-motion:reduce){.mercia-nav .nav-chevron,.mercia-nav .nav-dropdown a{transition:none}}