/**
 * 天机阁统一导航组件
 * Tianji Unified Navigation Component
 * 
 * 支持两个网站（六爻测算 & 紫微斗数）统一导航
 * 特点：品牌一致、跨站引流、响应式设计
 */

/* ============================================
   CSS 变量（兼容两个项目）
   ============================================ */
:root {
  --nav-gold: #d4af37;
  --nav-gold-dark: #b8960c;
  --nav-bg-dark: rgba(10, 10, 15, 0.95);
  --nav-bg-blur: blur(10px);
  --nav-text: rgba(255, 255, 255, 0.85);
  --nav-text-muted: rgba(255, 255, 255, 0.5);
  --nav-transition: all 0.3s ease;
  --nav-height: 70px;
  --nav-height-mobile: 60px;
}

/* ============================================
   统一导航栏 - 基础样式
   ============================================ */
.unified-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  height: var(--nav-height);
  background: transparent;
  transition: var(--nav-transition);
}

.unified-nav.scrolled {
  background: var(--nav-bg-dark);
  backdrop-filter: var(--nav-bg-blur);
  -webkit-backdrop-filter: var(--nav-bg-blur);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

/* ============================================
   品牌Logo区域
   ============================================ */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--nav-gold);
  transition: var(--nav-transition);
}

.nav-brand:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.nav-brand-icon {
  font-size: 28px;
  animation: yinyang-spin 8s linear infinite;
}

@keyframes yinyang-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.nav-brand-text {
  display: flex;
  flex-direction: column;
}

.nav-brand-name {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.15em;
  line-height: 1.2;
}

.nav-brand-tagline {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--nav-text-muted);
  margin-top: 2px;
}

/* ============================================
   导航链接区域
   ============================================ */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  position: relative;
  padding: 10px 18px;
  text-decoration: none;
  color: var(--nav-text);
  font-size: 14px;
  letter-spacing: 0.05em;
  border-radius: 8px;
  transition: var(--nav-transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.08);
  color: white;
}

.nav-item.active {
  color: var(--nav-gold);
  background: rgba(212, 175, 55, 0.1);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--nav-gold);
  border-radius: 1px;
}

/* 当前站点标记 */
.nav-item.current-site {
  position: relative;
}

.nav-item.current-site::after {
  content: '当前';
  position: absolute;
  top: 2px;
  right: 2px;
  font-size: 9px;
  padding: 2px 5px;
  background: var(--nav-gold);
  color: #000;
  border-radius: 4px;
  font-weight: 600;
}

.nav-item-icon {
  font-size: 15px;
}

/* ============================================
   分割线
   ============================================ */
.nav-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.15);
  margin: 0 8px;
}

/* ============================================
   外部链接样式
   ============================================ */
.nav-external {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-external-icon {
  font-size: 10px;
  opacity: 0.6;
  transition: var(--nav-transition);
}

.nav-item:hover .nav-external-icon {
  opacity: 1;
  transform: translate(2px, -2px);
}

/* ============================================
   移动端菜单按钮
   ============================================ */
.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 10001;
}

.nav-mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--nav-gold);
  transition: var(--nav-transition);
  border-radius: 1px;
}

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

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

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

/* ============================================
   移动端菜单
   ============================================ */
.nav-mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--nav-bg-dark);
  backdrop-filter: var(--nav-bg-blur);
  -webkit-backdrop-filter: var(--nav-bg-blur);
  padding: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: var(--nav-transition);
}

.nav-mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-mobile-menu .nav-item {
  padding: 16px 20px;
  margin-bottom: 8px;
  border-radius: 12px;
  justify-content: space-between;
}

.nav-mobile-menu .nav-item:last-child {
  margin-bottom: 0;
}

.nav-mobile-menu .nav-divider {
  display: none;
}

/* ============================================
   响应式适配
   ============================================ */
@media (max-width: 768px) {
  .unified-nav {
    height: var(--nav-height-mobile);
  }
  
  .unified-nav-container {
    padding: 0 16px;
  }
  
  .nav-brand-icon {
    font-size: 24px;
  }
  
  .nav-brand-name {
    font-size: 18px;
    letter-spacing: 0.1em;
  }
  
  .nav-brand-tagline {
    display: none;
  }
  
  .nav-menu {
    display: none;
  }
  
  .nav-mobile-toggle {
    display: flex;
  }
  
  .nav-mobile-menu {
    display: block;
    top: var(--nav-height-mobile);
  }
}

@media (max-width: 480px) {
  .nav-brand-name {
    font-size: 16px;
  }
}

/* ============================================
   页面内容顶部留白
   ============================================ */
body.has-unified-nav {
  padding-top: var(--nav-height);
}

@media (max-width: 768px) {
  body.has-unified-nav {
    padding-top: var(--nav-height-mobile);
  }
}

/* ============================================
   特殊页面适配（首页全屏Hero）
   ============================================ */
body.has-hero .unified-nav {
  background: transparent;
}

body.has-hero .unified-nav.scrolled {
  background: var(--nav-bg-dark);
}

/* 首页不需要顶部padding */
body.has-hero {
  padding-top: 0;
}

/* ============================================
   站点指示器（显示当前所在站点）
   ============================================ */
.site-indicator {
  position: fixed;
  top: calc(var(--nav-height) + 10px);
  right: 20px;
  background: rgba(212, 175, 55, 0.15);
  border: 1px solid rgba(212, 175, 55, 0.3);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 12px;
  color: var(--nav-gold);
  letter-spacing: 0.05em;
  z-index: 9998;
  backdrop-filter: blur(5px);
  transition: var(--nav-transition);
}

.site-indicator:hover {
  background: rgba(212, 175, 55, 0.25);
}

@media (max-width: 768px) {
  .site-indicator {
    display: none;
  }
}

/* ============================================
   导航栏加载动画
   ============================================ */
@keyframes navSlideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.unified-nav {
  animation: navSlideDown 0.5s ease;
}

/* ============================================
   项目特定适配
   ============================================ */

/* 61项目 - 六爻测算 */
.tj-liuyao .unified-nav {
  --nav-gold: #d4af37;
}

/* tjg项目 - 紫微斗数 */
.tj-ziwei .unified-nav {
  --nav-gold: #c9a96e;
}

/* tjg项目深色头部适配 */
.tj-ziwei .unified-nav.scrolled {
  background: rgba(26, 31, 46, 0.98);
}

/* ============================================
   导航链接提示
   ============================================ */
.nav-tooltip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: var(--nav-transition);
  pointer-events: none;
}

.nav-tooltip::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 4px solid rgba(0, 0, 0, 0.9);
}

.nav-item:hover .nav-tooltip {
  opacity: 1;
  visibility: visible;
  top: calc(100% + 12px);
}