/* Header */
.site-top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, background .2s ease;
}
.site-top.scrolled { border-bottom-color: var(--line); }
.site-top__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.02em;
}
.brand-mark {
  width: 28px; height: 28px;
  border-radius: 7px;
  background: var(--ink);
  color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0;
  position: relative;
  overflow: hidden;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,.18) 50%, transparent 60%);
}
.brand small {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--ink-4);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 4px;
}
.nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--ink-2);
  border-radius: 6px;
  transition: background .15s ease, color .15s ease;
}
.nav a:hover { background: var(--bg-soft); color: var(--ink); }
.nav a.active { color: var(--ink); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px;
  bottom: -1px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.nav a .caret {
  width: 10px; height: 10px;
  opacity: .6;
  transition: transform .15s ease;
}
.nav a:hover .caret { transform: translateY(1px); }

.actions { display: flex; align-items: center; gap: 8px; }
.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 10px 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-elev);
  color: var(--ink-4);
  font-size: 13px;
  cursor: pointer;
  min-width: 180px;
}
.search-trigger:hover { border-color: var(--line-strong); color: var(--ink-3); }

/* Mega menu */
.mega {
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-2);
  display: none;
}
.mega.open { display: block; animation: rise .2s ease both; }
.mega__inner {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 48px;
  padding-block: 32px;
}
.mega h4 {
  margin: 0 0 12px;
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.mega-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; }
.mega-item {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  padding: 10px;
  border-radius: 8px;
  transition: background .12s ease;
  cursor: pointer;
}
.mega-item:hover { background: var(--bg-soft); }
.mega-icon {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  display: grid; place-items: center;
  color: var(--ink);
}
.mega-item h5 { margin: 0; font-size: 14px; font-weight: 500; }
.mega-item p { margin: 2px 0 0; font-size: 12.5px; color: var(--ink-4); }
.mega-feature {
  border-left: 1px solid var(--line);
  padding-left: 32px;
  display: flex; flex-direction: column;
  gap: 12px;
}

/* Footer */
.site-foot {
  border-top: 1px solid var(--line);
  background: var(--bg);
  margin-top: 80px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-block: 56px;
}
.foot-grid h5 {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.foot-grid ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.foot-grid a { color: var(--ink-2); font-size: 14px; }
.foot-grid a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.foot-bottom {
  border-top: 1px solid var(--line);
  padding-block: 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-4);
  letter-spacing: 0.02em;
}
.foot-bottom .legal { display: flex; gap: 16px; }
.foot-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.foot-status .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(22,163,74,.2);
}

/* Page header (sub-pages) */
.page-head {
  border-bottom: 1px solid var(--line);
  padding-block: 64px 56px;
  position: relative;
  overflow: hidden;
}
.page-head .grid-bg {
  position: absolute; inset: 0;
  opacity: .35;
  -webkit-mask-image: linear-gradient(to bottom, black, transparent);
          mask-image: linear-gradient(to bottom, black, transparent);
  pointer-events: none;
}
.page-head__inner { position: relative; }
.crumbs {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 18px;
}
.crumbs a:hover { color: var(--ink-2); }
.crumbs span.sep { opacity: .5; }

@media (max-width: 980px) {
  .nav { display: none; }
  .search-trigger { min-width: 0; padding: 0 10px; }
  .search-trigger .kbd { display: none; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .mega__inner { grid-template-columns: 1fr; gap: 24px; padding-block: 24px; }
  .mega-feature { border-left: none; border-top: 1px solid var(--line); padding-left: 0; padding-top: 24px; }
}