/* ==========================================
   漂浮导航栏
   ========================================== */

.floating-nav {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-pill);
  padding: 12px 32px;
  box-shadow: var(--shadow-float);
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  max-width: 90vw;
}

.floating-nav:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
  transform: translateX(-50%) translateY(-2px);
}

.floating-nav.scrolled {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-hover);
  padding: 10px 28px;
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-primary);
  white-space: nowrap;
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 0;
  transition: color 0.3s ease, transform 0.3s ease;
  white-space: nowrap;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 1px;
}

.nav-links a:hover {
  color: var(--text-primary);
  transform: translateY(-2px);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

/* 移动端汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}