/* Shared header navigation. Loaded last on every page so it wins over the
   per-page nav rules. The markup lives in partials/header.html and is copied
   into every page by scripts/sync_chrome.py (repo root). */

/* Baseline for pages whose own stylesheet never styled the full header.
   :where() keeps these at zero specificity, so any page rule still wins. */
:where(header.top){position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--navy-line,#E3E3E3)}
:where(header.top .top-inner){display:flex;align-items:center;justify-content:space-between;gap:20px;position:relative}
:where(header.top .brand){display:flex;align-items:center;gap:10px}
:where(nav.links){display:flex;gap:20px;align-items:center}

/* Announcement bar above the header. */
.annbar{background:var(--ink,#0B0B0C);color:#fff;font-size:13px;text-align:center;padding:9px 16px;line-height:1.4}
.annbar a{color:#fff;display:inline-flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:center}
.annbar b{font-weight:600}
.annbar span{opacity:.8;border-bottom:1px solid rgba(255,255,255,.4)}
.annbar a:hover span{opacity:1;border-bottom-color:#fff}
.annbar .ar{display:inline-block;transition:transform .3s cubic-bezier(.22,1,.36,1)}
.annbar a:hover .ar{transform:translateX(3px)}

/* Menu button and the phone menu panel. 44px so it is a full tap target. */
.navtoggle{display:none;align-items:center;justify-content:center;width:44px;height:44px;flex:none;
  background:transparent;border:1px solid var(--navy-line,#E3E3E3);border-radius:8px;color:var(--ice,#0B0B0C);cursor:pointer;padding:0}
.navtoggle span{display:block;width:16px;height:1.5px;background:currentColor;position:relative}
.navtoggle span::before,.navtoggle span::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:currentColor}
.navtoggle span::before{top:-5px}
.navtoggle span::after{top:5px}
nav.links .nv-g{position:relative}
nav.links .nv-b{font:inherit;font-size:13.5px;font-weight:450;color:var(--ice-soft,#5F6368);background:transparent;border:0;padding:0;cursor:pointer;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;transition:color .2s}
nav.links .nv-b::after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px);transition:transform .18s}
nav.links .nv-b:hover,nav.links .nv-g.open .nv-b,nav.links .nv-g.cur .nv-b{color:var(--ice,#0B0B0C)}
nav.links .nv-g.open .nv-b::after{transform:rotate(225deg) translateY(-1px)}
nav.links .nv-m a{display:block;white-space:normal}
nav.links .nv-m a b{display:block;font-size:14px;font-weight:600;color:var(--ice,#0B0B0C)}
nav.links .nv-m a span{display:block;font-size:12.5px;line-height:1.45;color:var(--ice-soft,#5F6368);margin-top:2px}
nav.links .nv-m a[aria-current="page"]::after{display:none}
nav.links .nv-m a[aria-current="page"] b{color:var(--azure,#1A73E8)}
.nv-sub{display:none}

@media(min-width:1081px){
  nav.links{display:contents}
  nav.links .nv-g,nav.links>a{order:1}
  nav.links .nv-signin{order:3}
  nav.links .btn-azure{order:4}
  .sx-btn{order:2;margin-left:auto}
  .top-inner{justify-content:flex-start;gap:26px}
  nav.links .nv-m{display:none;position:absolute;top:calc(100% + 14px);left:-14px;width:290px;background:#fff;border:1px solid var(--navy-line,#E3E3E3);border-radius:12px;box-shadow:0 18px 40px -18px rgba(0,0,0,.28);padding:8px;z-index:70}
  nav.links .nv-g::before{content:"";position:absolute;left:0;right:0;top:100%;height:16px}
  nav.links .nv-g:hover .nv-m,nav.links .nv-g:focus-within .nv-m,nav.links .nv-g.open .nv-m{display:block}
  nav.links .nv-g.shut:not(.open) .nv-m{display:none}
  nav.links .nv-m a{padding:10px 12px;border-radius:8px}
  nav.links .nv-m a:hover{background:var(--navy-3,#F1F3F4)}
  nav.links .nv-signin{font-size:13.5px}
}

@media(max-width:1080px){
  .navtoggle{display:flex}
  /* Touch widths: announcement link, brand and search are 44px tap targets too. */
  .annbar{padding:0 16px}
  .annbar a{min-height:44px}
  header.top .brand{min-height:44px}
  header.top .sx-btn{min-height:44px;min-width:44px;justify-content:center}
  nav.links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;
    align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--navy-line,#E3E3E3);
    padding:6px 22px 16px;box-shadow:0 20px 40px -20px rgba(0,0,0,.35);
    max-height:calc(100vh - 64px);max-height:calc(100dvh - 64px);overflow-y:auto;overscroll-behavior:contain}
  nav.links.open{display:flex}
  nav.links a{display:flex;align-items:center;min-height:44px;padding:10px 0;font-size:15px;white-space:normal;border-bottom:1px solid var(--navy-line-2,#EEEEEE)}
  nav.links a.btn{margin-top:12px;justify-content:center;border-bottom:none}
  /* In the phone menu each group is a label with its links under it. */
  nav.links .nv-b{display:block;width:100%;text-align:left;padding:14px 0 4px;font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ice-dim,#80868B);cursor:default;pointer-events:none}
  nav.links .nv-b::after{display:none}
  nav.links .nv-m{display:block;position:static}
  nav.links .nv-m a{padding:10px 0 10px 12px;min-height:44px}
  nav.links .nv-m a span{display:none}
  nav.links .nv-g.cur .nv-b{color:var(--ice-dim,#80868B)}
}