/* =============================================
   华年集 · 导航栏样式
   Navigation - HuaNianJi
   ============================================= */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--space-4) 0;
  transition: all var(--ease-normal);
}

.nav.is-scrolled {
  background: rgba(6, 8, 16, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-3) 0;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo区域 */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: opacity var(--ease-fast);
}

.nav__logo:hover { opacity: 0.85; }

.nav__logo-img {
  height: 44px;
  width: auto;
  filter: drop-shadow(0 0 8px rgba(58, 143, 212, 0.4));
}

.nav__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav__logo-cn {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.15em;
}

.nav__logo-en {
  font-family: var(--font-en);
  font-size: var(--text-xs);
  color: var(--color-text-accent);
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

/* 导航菜单 */
.nav__menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: var(--space-1);
}

.nav__link {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
  transition: all var(--ease-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background: var(--color-cloud-blue);
  transition: width var(--ease-fast);
}

.nav__link:hover {
  color: var(--color-text-primary);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  width: 60%;
}

.nav__link.is-active {
  color: var(--color-cloud-blue-2);
}

/* 加入按钮 */
.nav__cta {
  padding: var(--space-2) var(--space-5);
  background: linear-gradient(135deg, var(--color-cloud-blue-3), var(--color-cloud-blue));
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  transition: all var(--ease-normal) !important;
  box-shadow: 0 0 15px rgba(58, 143, 212, 0.25);
}

.nav__cta::after { display: none !important; }

.nav__cta:hover {
  box-shadow: var(--shadow-glow-blue) !important;
  transform: translateY(-1px);
}

/* 登录/用户 区域 */
.nav__auth {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-right: var(--space-2);
  flex-shrink: 0;
}

.nav__auth-btn {
  font-size: var(--text-sm);
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all var(--ease-fast);
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
}

/* 注册按钮：镂空轮廓 */
.nav__auth-btn--reg {
  border: 1px solid rgba(107, 79, 160, 0.6);
  color: var(--color-brand-light);
  background: transparent;
}
.nav__auth-btn--reg:hover {
  background: rgba(107, 79, 160, 0.15);
  border-color: var(--color-brand-light);
  color: #fff;
}

/* 登录按钮：填充紫色 */
.nav__auth-btn--login {
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--color-brand), var(--color-brand-light));
  color: #fff;
}
.nav__auth-btn--login:hover {
  box-shadow: 0 0 14px rgba(107, 79, 160, 0.5);
  transform: translateY(-1px);
}

/* 已登录用户名 */
.nav__user-name {
  font-size: var(--text-sm);
  color: var(--color-brand-light);
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 退出按钮：红色轮廓 */
.nav__auth-btn--out {
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #f87171;
  background: transparent;
  font-size: var(--text-xs);
  padding: 4px 10px;
}
.nav__auth-btn--out:hover {
  background: rgba(239, 68, 68, 0.12);
  border-color: #f87171;
}

/* 汉堡菜单（移动端） */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--ease-normal);
}

.nav__hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端菜单抽屉 */
.nav__drawer {
  display: none;
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  background: rgba(6, 8, 16, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-6);
  z-index: calc(var(--z-nav) - 1);
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--ease-normal);
}

.nav__drawer.is-open {
  display: block;
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.nav__drawer-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav__drawer-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all var(--ease-fast);
}

.nav__drawer-link:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-dark);
  border-color: var(--color-border-subtle);
}

.nav__drawer-cta {
  margin-top: var(--space-4);
  width: 100%;
  text-align: center;
  padding: var(--space-4);
}

/* 响应式 */
@media (max-width: 900px) {
  .nav__menu { display: none; }
  .nav__auth  { display: none; }
  .nav__hamburger { display: flex; }
}