/* Theme default - header.css: site header, navigation, mega menu, language picker, burger. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgb(var(--surface-rgb) / 0.62);
  backdrop-filter: blur(16px) saturate(150%);
  transition: background 0.35s ease, border-color 0.35s ease;
}
.site-header.is-stuck {
  background: rgb(var(--surface-rgb) / 0.9);
  border-bottom-color: var(--line-strong);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--violet), var(--cyan), var(--aurora), transparent);
  background-size: 220% 100%;
  opacity: 0;
  transition: opacity 0.4s ease;
  animation: beam 9s linear infinite;
}
.site-header.is-stuck::after { opacity: 0.85; }
@keyframes beam { to { background-position: 220% 0; } }

.nav-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  min-height: 4.5rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.65rem; text-decoration: none; font-weight: 700; letter-spacing: -0.02em; font-size: 1.12rem; }
.brand-mark { width: 2rem; height: 2rem; flex: none; }
.brand-dot { color: var(--cyan); }
.nav { display: flex; align-items: center; justify-content: center; gap: 0.2rem; justify-self: center; }
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  border: 0;
  background: none;
  font: inherit;
  font-size: 0.94rem;
  color: var(--muted);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.18s, background 0.18s;
}
.nav-item:hover { color: var(--text); background: rgb(var(--primary-rgb) / 0.14); }
.nav-item[aria-current="page"], .nav-item[data-active="true"] { color: var(--text); background: rgb(var(--primary-rgb) / 0.2); }
.nav-item[aria-expanded="true"] { color: var(--text); background: rgb(var(--primary-rgb) / 0.18); }
.chev { width: 0.7rem; height: 0.7rem; transition: transform 0.18s; }
.nav-item[aria-expanded="true"] .chev { transform: rotate(180deg); }

.nav-group { position: relative; }
.mega {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 100%;
  z-index: 70;
  padding-top: 0.85rem;
}
.mega[hidden] { display: none; }
.mega::before {
  content: "";
  position: absolute;
  top: 0;
  left: -2rem;
  right: -2rem;
  height: 1.1rem;
}
.mega-inner { animation: megaIn 0.22s cubic-bezier(0.22, 1, 0.36, 1) both; }
@keyframes megaIn {
  from { opacity: 0; transform: translateY(-0.6rem) scale(0.985); }
  to { opacity: 1; transform: none; }
}
.mega-inner {
  position: relative;
  display: grid;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-l);
  background:
    radial-gradient(28rem 14rem at 82% 120%, rgb(var(--primary-rgb) / 0.32), transparent 70%),
    radial-gradient(20rem 12rem at 8% -20%, rgb(var(--steel-rgb) / 0.18), transparent 70%),
    rgb(var(--surface-rgb) / 0.96);
  backdrop-filter: blur(18px) saturate(160%);
  box-shadow: var(--shadow), 0 0 0 1px rgb(var(--ink-rgb) / 0.06) inset;
  min-width: 22rem;
}
.mega-inner::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(160deg, rgb(var(--primary-rgb) / 0.45), rgb(var(--ink-rgb) / 0.08) 45%, transparent 75%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
}
.mega-inner[data-cols="2"] { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); min-width: 40rem; }
.mega-col {
  display: grid;
  gap: 0.15rem;
  align-content: start;
  padding: 0.85rem;
  border-radius: var(--r-m);
  background: rgb(var(--surface-rgb) / 0.5);
  border: 1px solid var(--line);
}
.mega-cap {
  margin: 0 0 0.5rem;
  padding-inline: 0.55rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
}
.mega-item {
  position: relative;
  display: grid;
  gap: 0.1rem;
  padding: 0.65rem 0.7rem;
  border-radius: var(--r-s);
  text-decoration: none;
  transition: background 0.18s ease, transform 0.18s ease;
}
.mega-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  border-radius: 2px;
  transform: translateY(-50%);
  background: linear-gradient(180deg, var(--violet), var(--cyan));
  transition: height 0.22s ease;
}
.mega-item:hover {
  background: linear-gradient(90deg, rgb(var(--primary-rgb) / 0.2), rgb(var(--steel-rgb) / 0.06));
  transform: translateX(2px);
}
.mega-item:hover::before { height: 62%; }
.mega-item:hover .mega-title { color: var(--text-strong); }
.mega-item[aria-current="page"] { background: rgb(var(--steel-rgb) / 0.12); }
.mega-title { display: inline-flex; align-items: center; gap: 0.4rem; font-weight: 600; font-size: 0.95rem; color: var(--text); }
.mega-desc { font-size: 0.83rem; line-height: 1.45; color: var(--muted); }
.ext { width: 0.72rem; height: 0.72rem; color: var(--dim); flex: none; }

.nav-side { display: flex; align-items: center; gap: 0.6rem; justify-self: end; }
.btn-discord {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--bg-2);
  background: linear-gradient(100deg, var(--text), var(--primary) 55%, var(--primary-tint));
  border: 0;
  white-space: nowrap;
}
.btn-discord:hover { filter: brightness(1.08); }
.dc { width: 1.05rem; height: 1.05rem; }

.lang { position: relative; }
.lang summary {
  list-style: none;
  cursor: pointer;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--muted);
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
}
.lang summary::-webkit-details-marker { display: none; }
.lang[open] summary { color: var(--text); border-color: var(--line-strong); }
.lang-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.5rem);
  min-width: 12.5rem;
  padding: 0.4rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-m);
  background: var(--panel-solid);
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.1rem;
  z-index: 80;
}
.lang-menu a {
  display: flex;
  gap: 0.6rem;
  padding: 0.45rem 0.6rem;
  border-radius: var(--r-s);
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--muted);
}
.lang-menu a:hover { background: rgb(var(--primary-rgb) / 0.18); color: var(--text); }
.lang-menu a[aria-current="true"] { color: var(--cyan); }

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 0.28rem;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: none;
  cursor: pointer;
}
.burger span { display: block; height: 2px; border-radius: 2px; background: var(--text); transition: transform 0.2s, opacity 0.2s; }
.nav-open .burger span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-open .burger span:nth-child(2) { opacity: 0; }
.nav-open .burger span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }