/* 导航栏 */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 88px;
  display: flex;
  align-items: center;
  background: rgba(253,251,246,0.15);
  backdrop-filter: blur(18px) saturate(1.6);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  border-bottom: 1px solid rgba(240,184,72,0);
  opacity: 0;
  transform: translateY(-16px);
  animation: navbarFadeIn 0.7s cubic-bezier(0.4,0,0.2,1) 0.2s forwards;
  transition: background 0.45s cubic-bezier(0.4,0,0.2,1),
              border-color 0.45s cubic-bezier(0.4,0,0.2,1),
              box-shadow 0.45s cubic-bezier(0.4,0,0.2,1),
              height 0.4s cubic-bezier(0.4,0,0.2,1);
}

@keyframes navbarFadeIn {
  to { opacity: 1; transform: translateY(0); }
}

#navbar.scrolled {
  height: 72px;
  background: rgba(253,251,246,0.88);
  border-color: rgba(240,184,72,0.15);
  box-shadow: 0 4px 32px rgba(180,130,50,0.08);
}

.nav-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo img {
  width: 140px;
  height: 44px;
  border-radius: 8px;
  object-fit: cover;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  position: relative;
  padding: 10px 20px;
  font-size: 1rem;
  font-weight: 400;
  color: rgba(45,51,32,0.85);
  border-radius: 8px;
  transition: color 0.3s, background 0.3s;
  letter-spacing: 0.02em;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
}
.nav-links a:hover { color: var(--primary-dark); background: rgba(240,184,72,0.08); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: translateX(-50%) scaleX(1); }
.nav-links a.active { color: var(--primary-dark); font-weight: 500; }

/* 导航栏主题切换按钮 */
#theme-toggle-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid rgba(240,184,72,0.2);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 0.9rem;
  color: var(--text);
  font-weight: 400;
  white-space: nowrap;
}
#theme-toggle-nav:hover {
  background: rgba(240,184,72,0.08);
  border-color: var(--primary);
}
#theme-toggle-nav i {
  font-size: 1.1rem;
  transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
[data-theme="dark"] #theme-toggle-nav {
  border-color: rgba(100,181,246,0.2);
}
[data-theme="dark"] #theme-toggle-nav:hover {
  background: rgba(100,181,246,0.08);
  border-color: var(--primary);
}

/* 汉堡菜单（移动端） */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  transition: background 0.3s;
}
.nav-toggle:hover { background: rgba(240,184,72,0.1); }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1), opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(253,251,246,0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    padding: 12px 0 20px;
    box-shadow: 0 8px 32px rgba(180,130,50,0.10);
    transform: translateY(-110%);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1), opacity 0.4s;
    pointer-events: none;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    width: 100%;
    padding: 14px 32px;
    border-radius: 0;
    font-size: 1rem;
  }
  .nav-links a::after { display: none; }
  #theme-toggle-nav {
    width: calc(100% - 64px);
    margin: 8px 32px;
    justify-content: center;
  }
}