/* HVACpayback — canonical site navigation. Single source of truth for all pages,
   including the calculators. Requires the shared token set (--ink, --cool, etc.),
   which every page defines. */
.site-nav{background:linear-gradient(180deg,#22323e,var(--ink));color:#fff;position:sticky;top:0;z-index:50;border-bottom:3px solid var(--cool);box-shadow:0 2px 14px rgba(27,40,51,.18)}
.nav-inner{max-width:1240px;margin:0 auto;padding:11px 20px;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.wordmark{display:flex;align-items:center;gap:11px;text-decoration:none;color:#fff}
.wordmark .mark{display:flex;align-items:center;justify-content:center;width:40px;height:40px}
.wordmark .mark svg{display:block}
.wordmark .name{font-family:var(--disp);font-weight:700;font-size:24px;letter-spacing:.02em;line-height:1}
.wordmark .name .pb{color:#4cc244}
.wordmark .name small{display:block;font-family:var(--body);font-weight:500;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:#a8c6dd;margin-top:2px}
.nav-links{display:flex;gap:3px;align-items:center;flex-wrap:nowrap;list-style:none;margin:0;padding:0}
.nav-links a{font-family:var(--disp);font-weight:600;font-size:14.5px;letter-spacing:.045em;text-transform:uppercase;color:#d4e1ea;text-decoration:none;padding:9px 9px;border-radius:9px;white-space:nowrap;transition:background .15s,color .15s}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.09)}
.nav-links a[aria-current="page"]{color:#9fd2f7}
.nav-links a.nav-cta{background:var(--cool);color:#fff;margin-left:6px;box-shadow:0 2px 0 rgba(0,0,0,.28)}
.nav-links a.nav-cta:hover{background:var(--cool-deep)}
.nav-links a.nav-cta[aria-current="page"]{color:#fff;box-shadow:inset 0 0 0 2px rgba(255,255,255,.6),0 2px 0 rgba(0,0,0,.28)}
.nav-links a.nav-cta.heat{background:var(--heat)}
.nav-links a.nav-cta.heat:hover{background:var(--heat-deep)}
.skip-link{position:absolute;left:-9999px;background:var(--cool);color:#fff;padding:10px 16px;font-weight:700;z-index:100;border-radius:0 0 10px 0}
.skip-link:focus{left:0;top:0}
.nav-toggle{display:none}
/* designed two-row nav between hamburger and full single-row widths */
@media (min-width:741px) and (max-width:1259px){
  .nav-links{width:100%;flex-wrap:wrap;row-gap:6px;justify-content:flex-end;border-top:1px solid rgba(255,255,255,.13);margin-top:9px;padding-top:8px}
}
/* hamburger below 740px */
@media (max-width:740px){
  .nav-inner{padding:10px 14px;row-gap:0}
  .wordmark .name{font-size:21px}
  .wordmark .name small{display:none}
  .nav-toggle{display:inline-flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:46px;height:44px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.18);border-radius:10px;cursor:pointer;flex:0 0 auto;padding:0}
  .nav-toggle .nt-bar{display:block;width:21px;height:2.5px;background:#e7eef4;border-radius:2px;transition:transform .22s ease,opacity .18s ease}
  .site-nav.open .nav-toggle{background:rgba(255,255,255,.14)}
  .site-nav.open .nav-toggle .nt-bar:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
  .site-nav.open .nav-toggle .nt-bar:nth-child(2){opacity:0}
  .site-nav.open .nav-toggle .nt-bar:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
  .nav-links{display:none;width:100%;flex-direction:column;align-items:stretch;gap:7px;padding:12px 0 4px;border-top:1px solid rgba(255,255,255,.14);margin-top:11px}
  .site-nav.open .nav-links{display:flex;animation:navdrop .18s ease}
  @keyframes navdrop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
  .nav-links li{width:100%}
  .nav-links a{display:block;font-size:16.5px;padding:12px 14px;border-radius:10px;background:rgba(255,255,255,.05);white-space:normal}
  .nav-links a[aria-current="page"]{background:rgba(159,210,247,.12)}
  .nav-links a.nav-cta{margin-left:0;text-align:center;margin-top:2px}
}
@media (prefers-reduced-motion:reduce){.site-nav.open .nav-links{animation:none}.nav-toggle .nt-bar{transition:none}}
@media print{.site-nav,.skip-link,.nav-toggle{display:none}}

/* micro-interactions */
.wordmark .mark{transition:transform .18s ease}
.wordmark:hover .mark{transform:rotate(-3deg) scale(1.06)}
.nav-links a.nav-cta:active{transform:translateY(1px);box-shadow:0 1px 0 rgba(0,0,0,.28)}