/* Header styles — build on base.css */
:root {
  --hdr-bg: rgba(10, 12, 16, 0.85);
  --hdr-border: rgba(255, 255, 255, 0.08);
  --text: #e5e7eb;
  --muted: #a5b4fc;
  --accent: #60a5fa;
  --focus: #93c5fd;
}

/* Visually hidden utility */
.site-header .sr-only,
.skip-link.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* Skip link */
.skip-link { position: absolute; left: 0.75rem; top: -100%; background: #111827; color: #ffffff; padding: 0.6rem 0.9rem; border-radius: 0.4rem; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.4); transition: top .2s ease; }
.skip-link:focus { top: 0.75rem; outline: 2px solid var(--focus); outline-offset: 2px; }

.site-header { position: sticky; top: 0; z-index: 900; background: var(--hdr-bg); backdrop-filter: saturate(120%) blur(8px); border-bottom: 1px solid var(--hdr-border); }
.header-inner { max-width: 1200px; margin: 0 auto; padding: 0.75rem 1rem; display: flex; align-items: center; gap: 1rem; }

.brand { font-family: "Cinzel", serif; font-weight: 700; letter-spacing: 0.02em; color: #ffffff; text-decoration: none; font-size: 1.25rem; line-height: 1; }
.brand:focus { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 4px; }

.menu-toggle { display: none; background: transparent; color: #ffffff; border: 1px solid var(--hdr-border); padding: 0.5rem; border-radius: 0.5rem; line-height: 0; }
.menu-toggle:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.menu-toggle:hover { background: rgba(255,255,255,0.06); }
.menu-toggle .icon { display: block; }

.primary-nav { margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: 0.75rem; list-style: none; margin: 0; padding: 0; }
.nav-list a { display: inline-block; padding: 0.5rem 0.75rem; color: var(--text); text-decoration: none; border-radius: 0.5rem; }
.nav-list a:hover { color: #ffffff; background: rgba(255,255,255,0.06); }
.nav-list a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.nav-list .cta { color: #0b1220; background: linear-gradient(135deg, var(--accent), #7dd3fc); font-weight: 600; }
.nav-list .cta:hover { filter: brightness(1.05); }

/* Responsive behavior */
@media (max-width: 960px) {
  .menu-toggle { display: inline-flex;position: absolute;right: 0; }
  /* Progressive enhancement: menu visible by default; hidden on small screens only when JS marks .js-enabled */
  html.js-enabled .primary-nav { position: fixed; inset: 64px 0 auto 0; background: #0b0f17; border-top: 1px solid var(--hdr-border); padding: 0.75rem 1rem 1rem; box-shadow: 0 10px 30px rgba(0,0,0,0.5); display: none; }
  html.js-enabled .site-header.is-open .primary-nav { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0.25rem; }
  .nav-list a { padding: 0.7rem 0.9rem; }
  .nav-list .cta { text-align: center; }
}

/* Focus ring helper on high-contrast backgrounds */
.nav-list a:focus-visible, .menu-toggle:focus-visible, .brand:focus-visible { box-shadow: 0 0 0 2px var(--focus); }