/* ============================================================
   layout.css — page scaffolding: backgrounds, container, header
   nav, two-column layout grid, footer.
   ============================================================ */

/* Ambient background glow */
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(circle at 12% 8%, var(--glow-1), transparent 42%),
    radial-gradient(circle at 88% 30%, var(--glow-2), transparent 45%);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 3.6rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  flex-shrink: 0;
}

.brand-globe {
  color: var(--accent);
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
}

.nav-scroll {
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  mask-image: linear-gradient(to right, transparent, #000 12px, #000 calc(100% - 12px), transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 12px, #000 calc(100% - 12px), transparent);
}

.nav-scroll::-webkit-scrollbar {
  display: none;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  justify-content: flex-end;
  padding: 0 12px;
}

.nav-links a {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav-links a:hover {
  color: var(--accent);
  text-decoration: none;
  background: var(--accent-soft);
}

.nav-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- Two-column layout ---------- */
/* Sidebar + content composition centered as a unit: fixed sidebar column,
   capped content column, comparable left/right page margins */
.layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 800px);
  justify-content: center;
  gap: 3.5rem;
  align-items: start;
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.sidebar {
  position: sticky;
  top: 5.4rem;
}

.content {
  min-width: 0;
}

/* ---------- Footer: bottom-most element, centered ---------- */
.site-footer {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------- Responsive layout ---------- */
@media (max-width: 900px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
    padding-top: 2rem;
  }

  .sidebar {
    position: static;
  }

  .content {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 1.1rem;
  }

  .nav {
    gap: 0.6rem;
  }
}