nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 48px;
  background: linear-gradient(to bottom, var(--nav-bg-from), rgba(0,0,0,0));
  backdrop-filter: blur(0px);
  transition: backdrop-filter 0.4s, background 0.4s;
}
nav.scrolled {
  background: var(--nav-bg-scroll);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

/* ── THEME TOGGLE BUTTON ── */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--gold-dim);
  background: var(--gold-glow);
  color: var(--gold);
}
.theme-toggle svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}
.nav-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--gold), var(--vermilion));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Ma Shan Zheng', cursive;
  font-size: 18px;
  color: var(--ink);
  box-shadow: 0 0 20px rgba(212,168,78,0.4);
}
.nav-logo-name {
  font-family: 'Ma Shan Zheng', cursive;
  font-size: 20px;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.05em;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--gold); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.btn-nav {
  padding: 9px 22px;
  border-radius: 50px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.25s;
  letter-spacing: 0.04em;
}
.btn-nav-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.btn-nav-ghost:hover {
  border-color: var(--gold-dim);
  color: var(--gold);
}
.btn-nav-solid {
  background: linear-gradient(135deg, var(--gold), #B88A32);
  border: none;
  color: var(--ink);
  font-weight: 600;
  box-shadow: 0 0 24px rgba(212,168,78,0.3);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.btn-nav-solid:hover {
  box-shadow: 0 0 36px rgba(212,168,78,0.5);
  transform: translateY(-1px);
}

/* Language switcher dropdown */
.lang-switcher {
  position: relative;
}
.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 50px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.25s;
  letter-spacing: 0.04em;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.lang-btn:hover { border-color: var(--gold-dim); color: var(--gold); }
.lang-btn svg { transition: transform 0.25s; }
.lang-btn.open svg { transform: rotate(180deg); }
.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
  min-width: 130px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: all 0.2s;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
  z-index: 200;
}
.lang-dropdown.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.lang-option {
  display: block;
  width: 100%;
  padding: 9px 14px;
  font-size: 13px;
  font-family: inherit;
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 8px;
  text-align: left;
  letter-spacing: 0.04em;
  transition: all 0.15s;
}
.lang-option:hover { background: rgba(212,168,78,0.08); color: var(--gold); }
.lang-option.active { color: var(--gold); }

/* User menu dropdown */
.user-nav {
  position: relative;
}
.user-menu {
  position: relative;
}
.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.25s;
  border: 1px solid var(--border);
  background: transparent;
}
.user-info:hover {
  border-color: var(--gold-dim);
  background: var(--gold-glow);
}
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), var(--vermilion));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Ma Shan Zheng', cursive;
  font-size: 14px;
  color: var(--ink);
  flex-shrink: 0;
}
.user-info::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--text-dim);
  transition: transform 0.25s;
}
.user-info.open::after {
  transform: rotate(180deg);
}
.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
  min-width: 140px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: all 0.2s;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
  z-index: 200;
}
.dropdown-menu.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.dropdown-menu a {
  display: block;
  width: 100%;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  border-radius: 8px;
  text-align: left;
  letter-spacing: 0.04em;
  transition: all 0.15s;
}
.dropdown-menu a:hover {
  background: rgba(212,168,78,0.08);
  color: var(--gold);
}

@media (max-width: 900px) {
  nav { padding: 16px 24px; }
  .nav-links { display: none; }
}