/* Header, navigation and footer */
.site-header {
  position: fixed;
  inset: var(--announce-h) 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(15, 27, 45, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand { display: flex; align-items: center; gap: 12px; color: #fff; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--accent);
}

.brand-name { font-family: var(--font-serif); font-size: 1.25rem; font-weight: 600; }
.brand-sub { font-weight: 500; color: var(--accent); }

.site-nav { display: flex; align-items: center; gap: 32px; margin-left: auto; }

.site-nav a:not(.btn) {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.8);
  transition: color 0.2s;
}

.site-nav a:not(.btn):hover { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-toggle span { display: block; width: 24px; height: 2px; background: #fff; transition: transform 0.2s, opacity 0.2s; }

.site-footer { background: var(--ink); color: rgba(255, 255, 255, 0.6); padding: 32px 0; font-size: 0.9rem; }

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.site-footer .brand-name { color: #fff; font-size: 1.1rem; }
.site-footer p { margin: 0; }

@media (max-width: 820px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding: 24px;
    background: var(--ink);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: none;
  }

  .site-nav.is-open { display: flex; }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}