/* Shared site navigation used by both the static homepage and Next.js pages. */
:root {
  --site-nav-bg: rgba(255, 255, 255, 0.88);
  --site-nav-border: #e2e8f0;
  --site-nav-text: #0f172a;
  --site-nav-muted: #64748b;
  --site-nav-soft: #f1f5f9;
  --site-nav-accent: #4f46e5;
  --site-nav-accent-strong: #4038cb;
  --site-nav-accent-soft: #eef2ff;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--site-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--site-nav-border);
  color: var(--site-nav-text);
}

.nav .container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.02em;
  color: var(--site-nav-text);
  text-decoration: none;
}

.logo .hl {
  color: var(--site-nav-accent);
}

/* Seal-stamp mark: accent square, inner white rule, Kai-script glyph. */
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--site-nav-accent);
  display: grid;
  place-items: center;
  position: relative;
  flex: none;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.35);
}

.logo-mark::before {
  content: "";
  position: absolute;
  inset: 3.5px;
  border: 1.5px solid rgba(255, 255, 255, 0.42);
  border-radius: 4.5px;
}

.logo-mark .glyph {
  font-family: "LXGW WenKai", "Kaiti SC", "STKaiti", "KaiTi", "AR PL UKai CN",
    "Noto Serif CJK SC", serif;
  color: #fff;
  font-size: 19px;
  line-height: 1;
  transform: translateY(-0.5px);
  user-select: none;
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: 8px;
}

.nav-links a {
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--site-nav-muted);
  text-decoration: none;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--site-nav-text);
  background: var(--site-nav-soft);
}

.nav-spacer {
  flex: 1;
}

@media (max-width: 1000px) {
  .nav-inner {
    height: auto;
    min-height: 64px;
    flex-wrap: wrap;
    gap: 8px 12px;
    padding: 10px 0;
  }

  .nav-links {
    order: 3;
    width: 100%;
    margin-left: 0;
    gap: 2px;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

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

@media (max-width: 640px) {
  .nav-inner {
    min-height: 58px;
    padding: 8px 0;
  }

  .nav-links a {
    padding: 6px 9px;
    font-size: 13.5px;
  }

  .site-btn {
    padding: 7px 11px;
    font-size: 13px;
  }
}