/* ===== 导航 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-gray-100);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}
.navbar.scrolled { box-shadow: var(--shadow-md); }
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.navbar-logo img { height: 36px; }
.navbar-nav { display: flex; align-items: center; gap: 8px; }
.nav-item {
  position: relative;
  padding: 8px 16px;
  font-size: var(--text-base);
  color: var(--color-gray-700);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}
.nav-item:hover, .nav-item.active { color: var(--color-primary); background: var(--color-primary-50); }
.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 4px; left: 50%;
  transform: translateX(-50%);
  width: 16px; height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}
.navbar-cta { margin-left: 16px; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--color-gray-700); border-radius: 2px; transition: all var(--transition-fast); }

/* ===== 页脚 ===== */
.footer { background: var(--color-gray-900); color: var(--color-gray-400); padding: 64px 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-gray-700);
}
.footer-brand-logo { height: 32px; filter: brightness(0) invert(1); margin-bottom: 16px; }
.footer-brand-desc { font-size: var(--text-sm); line-height: 1.7; max-width: 280px; }
.footer-col-title { font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--color-white); margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: var(--text-sm); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-white); }
.footer-contact-item { display: flex; gap: 8px; font-size: var(--text-sm); margin-bottom: 10px; }
.footer-bottom {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  font-size: var(--text-xs);
}

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .navbar-nav, .navbar-cta { display: none; }
  .hamburger { display: flex; }
  .navbar-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--color-white);
    padding: 16px;
    border-bottom: 1px solid var(--color-gray-100);
    box-shadow: var(--shadow-lg);
  }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}