/**
 * 网站页眉样式
 * 
 * @author Yi Team
 * @description 易经主题页头导航样式，包含响应式设计
 */

/* ====== 页眉基础样式 ====== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #ffffff;
    border-bottom: 1px solid rgba(46, 78, 126, 0.1);
    box-shadow: 0 2px 10px rgba(46, 78, 126, 0.1);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.site-header-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--container-padding);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

/* ====== Logo 样式 ====== */
.site-logo {
    z-index: 1001;
    flex-shrink: 0;
    min-width: fit-content;
}

.site-logo a {
    display: flex;
    align-items: center;
    font-family: var(--font-secondary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #2e4e7e;
    text-decoration: none;
    letter-spacing: 1px;
    transition: color var(--transition-fast);
    gap: 0.5rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo-image {
    height: 40px;
    width: auto;
    max-width: 40px;
    transition: transform var(--transition-fast);
}

.logo-icon {
    font-size: 2rem;
    color: #2e4e7e;
    transition: transform var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.logo-text {
    font-family: var(--font-secondary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: #2e4e7e;
    transition: color var(--transition-fast);
    white-space: nowrap;
    line-height: 1;
}

.site-logo a:hover, 
.site-logo a:focus {
    text-decoration: none;
}

.site-logo a:hover .logo-text, 
.site-logo a:focus .logo-text {
    color: var(--color-gold);
}

.site-logo a:hover .logo-image, 
.site-logo a:focus .logo-image {
    transform: scale(1.1);
}

.site-logo a:hover .logo-icon, 
.site-logo a:focus .logo-icon {
    transform: scale(1.1) rotate(10deg);
    color: var(--color-gold);
}

/* ====== 语言切换器样式 - 下拉式 ====== */
.language-switcher {
    position: relative;
    display: flex;
    align-items: center;
    order: 3;
    margin-top: var(--spacing-md);
    width: 100%;
    justify-content: center;
    z-index: 1002;
}

.language-switcher.dropdown {
    flex-direction: column;
    align-items: center;
}

/* 当前语言触发按钮 */
.language-current {
    display: flex;
    align-items: center;
    background: transparent;
    border: none;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    color: #2e4e7e;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.language-current:hover,
.language-current:focus {
    background-color: rgba(46, 78, 126, 0.1);
    color: var(--color-gold);
}

.language-current .lang-flag {
    width: 20px;
    height: 20px;
    margin-right: 6px;
    border-radius: 2px;
}

.language-current .lang-name {
    margin-right: 6px;
}

.language-current .dropdown-arrow {
    font-size: 10px;
    transition: transform 0.3s ease;
}

/* 下拉箭头旋转动画 */
.language-switcher.active .dropdown-arrow {
    transform: rotate(180deg);
}

/* 下拉菜单容器 */
.language-dropdown {
    position: absolute;
    top: calc(100% + 5px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 140px;
    background-color: #ffffff;
    border: 1px solid rgba(46, 78, 126, 0.2);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(46, 78, 126, 0.15);
    opacity: 0;
    visibility: hidden;
    transform-origin: top center;
    transition: all 0.3s ease;
    overflow: hidden;
}

/* 显示下拉菜单 */
.language-switcher.active .language-dropdown,
.language-switcher:hover .language-dropdown {
    opacity: 1;
    visibility: visible;
}

/* 下拉菜单列表样式 */
.language-dropdown ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.language-dropdown li {
    margin: 0;
    width: 100%;
}

.language-dropdown a {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    color: #2e4e7e;
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 14px;
    width: 100%;
}

.language-dropdown a:hover,
.language-dropdown a:focus {
    background-color: rgba(46, 78, 126, 0.1);
    color: var(--color-gold);
}

.language-dropdown img {
    width: 20px;
    height: 20px;
    border-radius: 2px;
    margin-right: var(--spacing-xs);
}

.language-dropdown .current-lang {
    background-color: rgba(200, 134, 62, 0.1);
}

.language-dropdown .current-lang a {
    color: var(--color-gold);
    font-weight: var(--font-weight-bold);
}

/* ====== 用户登录状态样式 ====== */
.user-login-status {
    position: relative;
    display: flex;
    align-items: center;
    order: 2;
    margin-top: var(--spacing-md);
    width: 100%;
    justify-content: center;
    z-index: 1002;
}



/* 下拉菜单容器 */
.user-dropdown-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 下拉菜单触发按钮 */
.user-dropdown-trigger {
    display: flex;
    align-items: center;
    background: transparent;
    border: none;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    color: #2e4e7e;
    font-size: 14px;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 1px solid rgba(200, 134, 62, 0.3);
    background-color: rgba(200, 134, 62, 0.1);
}

.user-dropdown-trigger:hover,
.user-dropdown-trigger:focus {
    background-color: rgba(200, 134, 62, 0.2);
    border-color: var(--color-gold);
    color: var(--color-gold);
    outline: none;
}

/* 直接登录链接 */
.login-direct-link {
    display: flex;
    align-items: center;
    background: transparent;
    border: 1px solid rgba(46, 78, 126, 0.2);
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    color: #2e4e7e;
    font-size: 14px;
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    z-index: 1001;
}

.login-direct-link:hover,
.login-direct-link:focus {
    background-color: rgba(46, 78, 126, 0.1);
    border-color: var(--color-gold);
    color: var(--color-gold);
    text-decoration: none;
}

.login-direct-link:active {
    background-color: rgba(46, 78, 126, 0.2);
    transform: translateY(1px);
}

/* 图标和文字样式 */
.user-dropdown-trigger .user-icon,
.user-dropdown-trigger .user-name,
.login-direct-link .login-icon,
.login-direct-link .login-text {
    margin-right: 6px;
    font-weight: var(--font-weight-medium);
}

.user-dropdown-trigger .user-icon,
.login-direct-link .login-icon {
    font-size: 16px;
}

.user-dropdown-trigger .dropdown-arrow {
    font-size: 10px;
    margin-left: 4px;
    transition: transform var(--transition-fast);
}

.user-dropdown-container.active .dropdown-arrow {
    transform: rotate(180deg);
}

/* 下拉菜单 */
.user-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #ffffff;
    border: 1px solid rgba(200, 134, 62, 0.3);
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(46, 78, 126, 0.15);
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1003;
    margin-top: 8px; /* 与触发按钮保持一定距离 */
}

.user-dropdown-container.active .user-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.user-dropdown-menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.user-dropdown-menu li {
    border-bottom: 1px solid rgba(46, 78, 126, 0.1);
}

.user-dropdown-menu li:last-child {
    border-bottom: none;
}

.user-dropdown-menu a {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    color: #2e4e7e;
    text-decoration: none;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.user-dropdown-menu a:hover,
.user-dropdown-menu a:focus {
    background-color: rgba(200, 134, 62, 0.1);
    color: var(--color-gold);
}

.user-dropdown-menu .menu-icon {
    margin-right: 8px;
    font-size: 16px;
}

/* ====== 导航菜单样式 ====== */
.site-nav {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.site-nav.active {
    max-height: 500px;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.nav-list li {
    margin: 0;
}

.nav-list a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: #2e4e7e;
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: var(--font-size-base);
    text-align: center;
}

.nav-list a:hover,
.nav-list a:focus {
    color: var(--color-gold);
    text-decoration: none;
}

/* ====== 汉堡菜单按钮 ====== */
.nav-toggle {
    display: block;
    background: transparent;
    border: none;
    color: #2e4e7e;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
    transition: color var(--transition-fast);
}

.nav-toggle:hover,
.nav-toggle:focus {
    color: var(--color-gold);
    outline: none;
}

/* ====== 响应式设计 ====== */
@media (min-width: 768px) {
    .site-header-inner {
        flex-wrap: nowrap;
    }
    
    .site-nav {
        width: auto;
        max-height: none;
        overflow: visible;
        flex-grow: 1;
    }
    
    .nav-list {
        flex-direction: row;
        justify-content: flex-end;
        flex-wrap: nowrap;
    }
    
    .nav-list li {
        margin-left: var(--spacing-sm);
        white-space: nowrap;
    }
    
    .nav-list a {
        padding: var(--spacing-xs) var(--spacing-xs);
        text-align: left;
        font-size: 14px;
        font-weight: 500;
    }
    
    .nav-toggle {
        display: none;
    }
    
    .language-switcher {
        order: 3;
        width: auto;
        margin-top: 0;
        margin-left: var(--spacing-md);
        justify-content: flex-end;
    }
    
    .language-dropdown {
        left: 0;
        transform: translateX(0);
    }
    
    .user-login-status {
        order: 2;
        width: auto;
        margin-top: 0;
        margin-left: var(--spacing-md);
        justify-content: flex-end;
    }
    
    .user-dropdown-menu {
        left: 0;
        transform: translateX(0);
        min-width: 180px;
    }
    
    .user-dropdown-container.active .user-dropdown-menu {
        transform: translateX(0) translateY(0);
    }
}

/* 中等屏幕优化 - 进一步紧凑菜单 */
@media (min-width: 768px) and (max-width: 1024px) {
    .nav-list li {
        margin-left: 6px;
    }
    
    .nav-list a {
        padding: 6px 4px;
        font-size: 13px;
    }
    
    .site-header-inner {
        padding: 10px 15px;
    }
    
    .language-switcher {
        margin-left: 8px;
    }
    
    .user-login-status {
        margin-left: 8px;
    }
    
    .user-dropdown-menu {
        min-width: 160px;
    }
}

/* 大屏幕优化 */
@media (min-width: 1200px) {
    .nav-list li {
        margin-left: var(--spacing-md);
    }
    
    .nav-list a {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 15px;
    }
    
    .user-login-status {
        margin-left: var(--spacing-md);
    }
    
    .user-dropdown-menu {
        min-width: 200px;
    }
}

/* ====== 固定后的页眉 ====== */
.site-header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    padding: var(--spacing-xs) 0;
}

/* ====== 当前激活页面高亮 ====== */
.nav-list .current-menu-item > a,
.nav-list .current-page-ancestor > a {
    color: #8ECAE6;
    position: relative;
}

.nav-list .current-menu-item > a:after,
.nav-list .current-page-ancestor > a:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background-color: #8ECAE6;
}

@media (max-width: 767px) {
    .nav-list .current-menu-item > a:after,
    .nav-list .current-page-ancestor > a:after {
        left: 0;
        transform: none;
        width: 100%;
    }
    
    .user-dropdown-menu {
        min-width: 140px;
        right: 0;
        left: auto;
        transform: translateX(0);
    }
    
    .user-dropdown-container.active .user-dropdown-menu {
        transform: translateX(0) translateY(0);
    }
    
    .user-dropdown-menu a {
        padding: 8px 12px;
        font-size: 13px;
    }
}

/* ====== 页眉下的页面填充 ====== */
body {
    padding-top: 70px; /* 为固定头部预留空间 */
}

@media (min-width: 768px) {
    body {
        padding-top: 80px;
    }
    
    .logo-image {
        height: 45px;
        max-width: 45px;
    }
    
    .logo-icon {
        font-size: 2.2rem;
        width: 45px;
        height: 45px;
    }
    
    .logo-text {
        font-size: 1.4rem;
        white-space: nowrap;
    }
}

/* 移动端logo优化 */
@media (max-width: 767px) {
    .logo-image {
        height: 35px;
        max-width: 35px;
    }
    
    .logo-icon {
        font-size: 1.8rem;
        width: 35px;
        height: 35px;
    }
    
    .logo-text {
        font-size: 1.1rem;
        letter-spacing: 0.5px;
        white-space: nowrap;
    }
    
    .site-logo a {
        gap: 0.3rem;
    }
}