/* ============================================================
   RESEEKiT! shared marketing header (site-header.css)
   One copy of the public-site header, used by index.html and every
   public marketing / resource / legal page. Rendered by
   site-header.js into <header id="site-header">.

   Self-contained: every rule is scoped under .sh (so host-page rules
   such as a bare `a{...}` or `.btn{...}` can never restyle it) and
   every colour is an --sh-* token defined on .sh, so the header looks
   identical whatever tokens the host page defines. Theme convention
   matches the rest of the site: bare :root is DARK,
   :root[data-theme="light"] is LIGHT (applied by each page's
   pre-paint script from the 'proveit_theme' localStorage key).
   ============================================================ */
.sh{
  /* DARK (the toggle target) */
  --sh-bg2:#0d0d12; --sh-ink:#f3f3f7; --sh-muted:#9b9baa; --sh-faint:#6a6a78;
  --sh-line:rgba(255,255,255,.09); --sh-line2:rgba(255,255,255,.05);
  --sh-glass:rgba(255,255,255,.045); --sh-glass2:rgba(255,255,255,.07);
  --sh-red:#22c55e; --sh-glow-red:rgba(34,197,94,.5);
  --sh-header-bg:rgba(8,8,11,.66);
  --sh-shadow:0 2px 6px rgba(0,0,0,.4), 0 24px 60px -34px rgba(0,0,0,.85);
  --sh-shadow-lg:0 6px 14px rgba(0,0,0,.5), 0 44px 120px -44px rgba(0,0,0,.92);
  --sh-btn-red-grad:linear-gradient(180deg,#2ee06a,#16a34a);
  --sh-btn-red-ink:#06210f;
  --sh-btn-red-shadow:0 0 0 1px rgba(74,222,128,.4), 0 10px 34px -8px var(--sh-glow-red);
  --sh-btn-red-shadow-hover:0 0 0 1px rgba(110,235,150,.6), 0 14px 46px -8px var(--sh-glow-red);
  --sh-btn-glass-shadow:none; --sh-btn-glass-hover-border:rgba(255,255,255,.24);
  --sh-r-sm:11px; --sh-r-xs:9px;
  --sh-pad:clamp(18px,4vw,44px);
}
:root[data-theme="light"] .sh{
  /* LIGHT (the default a normal visitor sees) */
  --sh-bg2:#ffffff; --sh-ink:#141319; --sh-muted:#5c5b68; --sh-faint:#9796a4;
  --sh-line:rgba(20,19,30,.11); --sh-line2:rgba(20,19,30,.06);
  --sh-glass:rgba(255,255,255,.66); --sh-glass2:rgba(255,255,255,.92);
  --sh-red:#159a45; --sh-glow-red:rgba(21,154,69,.34);
  --sh-header-bg:rgba(244,245,248,.72);
  --sh-shadow:0 1px 2px rgba(20,19,30,.05), 0 26px 60px -34px rgba(20,19,30,.30);
  --sh-shadow-lg:0 2px 4px rgba(20,19,30,.05), 0 46px 110px -46px rgba(20,19,30,.40);
  --sh-btn-red-grad:linear-gradient(180deg,#22c55e,#16a34a);
  --sh-btn-red-ink:#06210f;
  --sh-btn-red-shadow:0 10px 30px -8px var(--sh-glow-red);
  --sh-btn-red-shadow-hover:0 16px 44px -8px var(--sh-glow-red);
  --sh-btn-glass-shadow:var(--sh-shadow); --sh-btn-glass-hover-border:rgba(20,19,30,.24);
}

/* ---------- shell + local reset ---------- */
header.sh{position:sticky; top:0; z-index:50; display:block; width:100%; flex-shrink:0; border-bottom:1px solid var(--sh-line2); background:var(--sh-header-bg); -webkit-backdrop-filter:saturate(1.3) blur(16px); backdrop-filter:saturate(1.3) blur(16px);
  color:var(--sh-ink); font-family:'Inter',system-ui,sans-serif; font-size:16px; font-weight:400; line-height:1.6; letter-spacing:-.012em; text-align:left; text-transform:none; -webkit-font-smoothing:antialiased;}
.sh *, .sh *::before, .sh *::after{box-sizing:border-box; margin:0; padding:0;}
.sh a{color:inherit; text-decoration:none; font-weight:inherit;}
.sh button{font:inherit; letter-spacing:inherit; color:inherit; text-transform:none;}
.sh img{max-width:100%;}

.sh .sh-inner{display:flex; align-items:center; justify-content:space-between; gap:16px; padding:14px var(--sh-pad); max-width:1200px; margin:0 auto;}

/* ---------- brand lockup ---------- */
.sh .sh-brand{display:flex; align-items:center; gap:16px;}
.sh .sh-parent{display:flex; flex-direction:column; gap:2px; padding-right:16px; border-right:1px solid var(--sh-line);}
.sh .sh-parent .sh-top{font-family:'Anton',sans-serif; font-size:14px; color:var(--sh-ink);}
.sh .sh-parent .sh-top .sh-it{color:#e8161a;}
.sh .sh-parent .sh-sub{font-family:'IBM Plex Mono',monospace; font-size:7.5px; letter-spacing:.22em; color:var(--sh-faint);}
.sh .sh-product{display:flex; align-items:center; gap:11px;}
.sh .sh-product .sh-mark{display:inline; width:38px; height:38px; flex-shrink:0; object-fit:contain;}
.sh .sh-product .sh-name{font-family:'Anton',sans-serif; font-size:22px; letter-spacing:.01em; line-height:1; color:var(--sh-ink);}
.sh .sh-product .sh-name .sh-it{color:var(--sh-red);}
.sh .sh-product .sh-tag{font-family:'Barlow Condensed',sans-serif; font-size:9.5px; color:var(--sh-faint); letter-spacing:.1em; text-transform:uppercase; margin-top:3px;}
@media(max-width:600px){ .sh .sh-parent{display:none;} }

/* ---------- desktop links ---------- */
.sh .sh-links{display:flex; align-items:center; gap:28px;}
.sh .sh-link{font-size:14px; font-weight:500; color:var(--sh-muted); padding-bottom:18px; position:relative; line-height:1; display:inline-flex; align-items:center; gap:4px; transition:color .15s; background:none; border:0; cursor:pointer;}
.sh .sh-link.is-active{color:var(--sh-ink);}
.sh .sh-link.is-active::after{content:""; position:absolute; bottom:0; left:0; right:0; height:2px; background:var(--sh-red); border-radius:2px; box-shadow:0 0 10px var(--sh-glow-red);}
.sh .sh-link:hover{color:var(--sh-ink);}

/* Resources dropdown: opens on click / tap / keyboard (and hover on
   pointer devices, wired in site-header.js), never on hover alone. */
.sh .sh-dd{position:relative; display:flex; align-items:center; padding-bottom:18px;}
.sh .sh-dd .sh-dd-trigger{padding-bottom:0;}
.sh .sh-dd-trigger[aria-expanded="true"]{color:var(--sh-ink);}
.sh .sh-dd-trigger.is-active::after{bottom:-18px;}
.sh .sh-dd-menu{display:none; position:absolute; top:100%; left:0; margin-top:6px; background:var(--sh-bg2); border:1px solid var(--sh-line); border-radius:var(--sh-r-sm); min-width:184px; box-shadow:var(--sh-shadow-lg); z-index:60; overflow:visible; padding:6px; -webkit-backdrop-filter:blur(20px); backdrop-filter:blur(20px);}
/* invisible bridge over the 6px gap so the pointer can travel into the menu */
.sh .sh-dd-menu::before{content:""; position:absolute; left:0; right:0; top:-8px; height:8px;}
.sh .sh-dd.is-open .sh-dd-menu{display:block;}
.sh .sh-dd-menu a{display:block; padding:10px 12px; font-size:14px; font-weight:500; line-height:1.3; color:var(--sh-muted); border-radius:var(--sh-r-xs); white-space:nowrap; transition:color .15s;}
.sh .sh-dd-menu a:hover{background:var(--sh-glass); color:var(--sh-ink);}
.sh .sh-dd-menu a[aria-current="page"]{color:var(--sh-ink); box-shadow:inset 2px 0 0 var(--sh-red);}

/* ---------- action buttons ---------- */
.sh .sh-actions{display:flex; align-items:center; gap:12px;}
.sh .sh-btn{display:inline-flex; align-items:center; gap:9px; font-weight:600; font-size:14px; padding:13px 24px; border-radius:12px; cursor:pointer; border:1px solid transparent; white-space:nowrap; transition:transform .1s, box-shadow .25s, background .2s, border-color .2s;}
.sh .sh-btn:active{transform:translateY(1px);}
.sh .sh-btn-red{background:var(--sh-btn-red-grad); color:var(--sh-btn-red-ink); box-shadow:var(--sh-btn-red-shadow);}
.sh .sh-btn-red:hover{box-shadow:var(--sh-btn-red-shadow-hover); transform:translateY(-1px);}
.sh .sh-btn-outline{background:var(--sh-glass2); color:var(--sh-ink); border-color:var(--sh-line); box-shadow:var(--sh-btn-glass-shadow); -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);}
.sh .sh-btn-outline:hover{border-color:var(--sh-btn-glass-hover-border);}
.sh .sh-arrow{font-family:'IBM Plex Mono',monospace;}

/* ---------- theme toggle ---------- */
.sh .sh-theme{display:inline-flex; align-items:center; justify-content:center; width:38px; height:38px; border-radius:50%; border:1px solid var(--sh-line); background:var(--sh-glass2); color:var(--sh-muted); cursor:pointer; transition:color .15s, border-color .15s; -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px); flex-shrink:0;}
.sh .sh-theme:hover{color:var(--sh-ink); border-color:var(--sh-red);}
.sh .sh-theme .sh-i-sun{display:block;}
.sh .sh-theme .sh-i-moon{display:none;}
:root[data-theme="light"] .sh .sh-theme .sh-i-sun{display:none;}
:root[data-theme="light"] .sh .sh-theme .sh-i-moon{display:block;}

/* ---------- phone menu ---------- */
.sh .sh-burger{display:none; flex-direction:column; justify-content:center; gap:5px; width:40px; height:40px; background:none; border:none; cursor:pointer; padding:0; flex-shrink:0;}
.sh .sh-burger span{display:block; width:22px; height:2px; background:var(--sh-ink); transition:.2s; margin:0 auto; border-radius:2px;}
.sh .sh-burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.sh .sh-burger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.sh .sh-burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.sh .sh-mobile{display:none; flex-direction:column; padding:0 var(--sh-pad); max-height:0; overflow:hidden; visibility:hidden; transition:max-height .25s ease, visibility 0s linear .25s; border-top:1px solid var(--sh-line);}
.sh .sh-mobile.is-open{max-height:calc(100vh - 64px); overflow-y:auto; visibility:visible; transition:max-height .25s ease; padding:16px var(--sh-pad) 20px;}
.sh .sh-mobile a{padding:13px 0; font-size:15px; border-bottom:1px solid var(--sh-line2); color:var(--sh-muted);}
.sh .sh-mobile a[aria-current="page"]{color:var(--sh-red);}
.sh .sh-mobile-actions{display:flex; gap:10px; margin-top:16px;}
.sh .sh-mobile-actions .sh-btn{flex:1; justify-content:center;}
/* the generic ".sh-mobile a" rule above would grey these button links; restore button colours */
.sh .sh-mobile .sh-mobile-actions .sh-btn{padding:13px 24px; font-size:14px; border:1px solid transparent;}
.sh .sh-mobile .sh-mobile-actions .sh-btn-red{color:var(--sh-btn-red-ink);}
.sh .sh-mobile .sh-mobile-actions .sh-btn-outline{color:var(--sh-ink); border-color:var(--sh-line);}

@media(max-width:900px){
  .sh .sh-links{display:none;}
  .sh .sh-burger{display:flex;}
  .sh .sh-mobile{display:flex;}
  .sh .sh-actions{gap:8px;}
  .sh .sh-actions .sh-btn{padding:9px 14px; font-size:12px;}
  .sh .sh-actions .sh-btn-red{display:none;}
}