.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--background-color);
    box-shadow: var(--box-shadow-light);
    height: var(--header-height);
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo-title {
    font-size: 18px;
    font-weight: light;
    color: var(--text-color);
}

.logo-subtitle {
    font-size: 13px;
    color: var(--text-color-secondary);
    line-height: 1.2;
    margin-top: 2px;
    font-weight: light;
}

/* Logo标题各应用模块主题色 */
body[data-app="news"] .logo-title {
    color: var(--color-news-start);
}

body[data-app="job"] .logo-title {
    color: var(--color-job-start);
}

body[data-app="secondhand"] .logo-title {
    color: var(--color-secondhand-start);
}

body[data-app="service"] .logo-title {
    color: var(--color-service-start);
}

body[data-app="house"] .logo-title {
    color: var(--color-house-start);
}

body[data-app="love"] .logo-title {
    color: var(--color-love-start);
}

body[data-app="event"] .logo-title {
    color: var(--color-event-start);
}

.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
    overflow: visible;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    margin: 0 5px;
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.nav-item {
    position: relative;
}

.nav-arrow {
    font-size: 10px;
    margin-left: 2px;
    transition: transform 0.3s ease;
    opacity: 0.7;
}

.has-submenu:hover .nav-arrow {
    transform: rotate(180deg);
}

/* 扩展 hover 区域，确保鼠标能从导航移动到二级菜单 */
.has-submenu {
    z-index: 100;
    position: relative;
}

/* 二级菜单默认隐藏 */
.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 180px;
    z-index: 1001;
}

/* hover 或 active 时显示 */
.has-submenu:hover > .submenu,
.has-submenu.active > .submenu {
    display: block;
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) 0;
    color: var(--text-color);
    font-size: var(--font-size-md);
    font-weight: 500;
    transition: color var(--transition-duration) var(--transition-function);
    text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-duration) var(--transition-function);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* 导航菜单默认显示全称 */
.nav-full-name {
    display: inline;
}

.nav-short-name {
    display: none;
}

/* 各应用导航激活状态主题色 */
body[data-app="news"] .nav-link.active,
body[data-app="news"] .nav-link:hover {
    color: var(--color-news-start);
}
body[data-app="news"] .nav-link::after {
    background-color: var(--color-news-start);
}

body[data-app="job"] .nav-link.active,
body[data-app="job"] .nav-link:hover {
    color: var(--color-job-start);
}
body[data-app="job"] .nav-link::after {
    background-color: var(--color-job-start);
}

body[data-app="secondhand"] .nav-link.active,
body[data-app="secondhand"] .nav-link:hover {
    color: var(--color-secondhand-start);
}
body[data-app="secondhand"] .nav-link::after {
    background-color: var(--color-secondhand-start);
}

body[data-app="service"] .nav-link.active,
body[data-app="service"] .nav-link:hover {
    color: var(--color-service-start);
}
body[data-app="service"] .nav-link::after {
    background-color: var(--color-service-start);
}

body[data-app="house"] .nav-link.active,
body[data-app="house"] .nav-link:hover {
    color: var(--color-house-start);
}
body[data-app="house"] .nav-link::after {
    background-color: var(--color-house-start);
}

body[data-app="love"] .nav-link.active,
body[data-app="love"] .nav-link:hover {
    color: var(--color-love-start);
}
body[data-app="love"] .nav-link::after {
    background-color: var(--color-love-start);
}

body[data-app="event"] .nav-link.active,
body[data-app="event"] .nav-link:hover {
    color: var(--color-event-start);
}
body[data-app="event"] .nav-link::after {
    background-color: var(--color-event-start);
}

.user-area {
    flex-shrink: 0;
    margin-left: var(--spacing-xl);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    color: var(--text-color);
    font-weight: 500;
}

.user-msg {
    position: relative;
    color: var(--text-color-secondary);
    font-size: var(--font-size-md);
}

.user-msg:hover {
    color: var(--color-primary);
}

.msg-count {
    position: absolute;
    top: -8px;
    right: -8px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background-color: var(--color-danger);
    color: #ffffff;
    font-size: 11px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logout-link {
    color: var(--text-color-secondary);
    font-size: var(--font-size-sm);
}

.logout-link:hover {
    color: var(--color-danger);
}

.site-footer {
    background-color: #1f1f1f;
    color: #a0a0a0;
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-xxl) var(--container-padding);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.footer-section {
    min-width: 0;
}

.footer-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: #ffffff;
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links li a {
    color: #a0a0a0;
    transition: color var(--transition-duration) var(--transition-function);
}

.footer-links li a:hover {
    color: var(--color-primary);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-round);
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: var(--font-size-md);
    transition: all var(--transition-duration) var(--transition-function);
}

.social-link:hover {
    background-color: var(--color-primary);
    transform: translateY(-2px);
}

.contact-info {
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.copyright {
    font-size: var(--font-size-sm);
}

.copyright a {
    color: #a0a0a0;
}

.copyright a:hover {
    color: var(--color-primary);
}

.main-container {
    min-height: calc(100vh - var(--header-height));
    background-color: var(--background-color-page);
    padding-bottom: 20px;
}

/* ========================================
   头部搜索框展开功能
   ======================================== */

/* 右侧功能区 - 包含所有功能按钮 */
.header-actions {
    display: flex;
    align-items: center;
    flex-direction: row-reverse;
    gap: var(--spacing-sm);
    margin-left: auto;
}

/* 用户区域 */
.user-area {
    flex-shrink: 0;
    margin-left: var(--spacing-sm);
}

.auth-links {
    display: flex;
    gap: var(--spacing-sm);
}

.login-btn {
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 13px;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--theme-gradient);
    color: #ffffff;
    text-decoration: none;
}

.login-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* 各应用登录按钮 hover 效果 */
body[data-app="news"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

body[data-app="job"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(17, 153, 142, 0.3);
}

body[data-app="secondhand"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(240, 147, 251, 0.3);
}

body[data-app="house"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

body[data-app="service"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

body[data-app="love"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(255, 107, 157, 0.3);
}

body[data-app="event"] .login-btn:hover {
    box-shadow: 0 4px 12px rgba(240, 147, 251, 0.3);
}

/* 主题选择器 */
.theme-picker {
    flex-shrink: 0;
}

.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--background-color);
    cursor: pointer;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: scale(1.1);
    border-color: var(--theme-primary);
}

.theme-indicator {
    width: 100%;
    height: 100%;
    background: var(--theme-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-indicator i {
    color: #ffffff;
    font-size: 14px;
}

/* 搜索区域容器 */
.search-wrapper {
    display: flex;
    align-items: center;
    gap: 0;
}

/* 搜索切换按钮 */
.search-toggle-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-color);
    flex-shrink: 0;
}

.search-toggle-btn:hover {
    border-color: var(--theme-primary);
    color: var(--theme-primary);
    transform: scale(1.1);
}

.search-toggle-btn i {
    font-size: 14px;
}

/* 搜索框容器 - 默认隐藏 */
.search-box {
    position: relative;
    width: 0;
    overflow: hidden;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateX(30px) scaleX(0.8);
}

.search-box.active {
    width: auto;
    opacity: 1;
    transform: translateX(0) scaleX(1);
}

/* 搜索表单 */
.search-form {
    display: flex;
    align-items: center;
    background: var(--background-color);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    height: 36px;
}

.search-form:focus-within {
    border-color: var(--theme-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

/* 搜索提交按钮 */
.search-submit {
    padding: 8px 12px;
    background: transparent;
    border: none;
    color: var(--text-color-secondary);
    cursor: pointer;
    transition: color 0.5s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-submit:hover {
    color: var(--theme-primary);
}

.search-submit i {
    font-size: 12px;
}

/* 搜索输入框 */
.search-input {
    border: none;
    background: transparent;
    padding: 8px 0;
    font-size: 13px;
    color: var(--text-color);
    width: 200px;
    min-width: 0;
    height: 100%;
}

.search-input::placeholder {
    color: var(--text-color-placeholder);
}

.search-input:focus {
    outline: none;
}

/* 关闭按钮 */
.search-close {
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-color-secondary);
    cursor: pointer;
    transition: all 0.5s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-close:hover {
    color: var(--color-danger);
    transform: scale(1.1);
}

.search-close i {
    font-size: 12px;
}

/* 导航菜单隐藏状态 */
.main-nav.shrink {
    max-width: 60%;
    flex-shrink: 1;
}

.main-nav.shrink .nav-list {
    gap: var(--spacing-sm);
}

/* ========================================
   二级下拉菜单样式
   ======================================== */

/* 下拉菜单容器样式已在上方定义 */

.submenu-inner {
    background: var(--background-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    padding: var(--spacing-sm) 0;
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.submenu-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-color);
    font-size: var(--font-size-base);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    white-space: nowrap;
}

.submenu-item::before {
    content: '';
    position: absolute;
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    bottom: 0;
    height: 1px;
    background: var(--border-light);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.submenu-item:last-child::before {
    display: none;
}

.submenu-item:hover {
    background: var(--background-color-page);
    color: var(--theme-primary);
    padding-left: calc(var(--spacing-lg) + 8px);
}

.submenu-item:hover::before {
    transform: scaleX(1);
}

/* 各应用下拉菜单主题色 */
body[data-app="news"] .submenu-item:hover {
    color: var(--color-news-start);
}

body[data-app="job"] .submenu-item:hover {
    color: var(--color-job-start);
}

body[data-app="secondhand"] .submenu-item:hover {
    color: var(--color-secondhand-start);
}

body[data-app="service"] .submenu-item:hover {
    color: var(--color-service-start);
}

body[data-app="house"] .submenu-item:hover {
    color: var(--color-house-start);
}

body[data-app="love"] .submenu-item:hover {
    color: var(--color-love-start);
}

body[data-app="event"] .submenu-item:hover {
    color: var(--color-event-start);
}

/* ========================================
   移动端底部TabBar
   ======================================== */

.mobile-tabbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: #ffffff;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 9999;
    padding-bottom: env(safe-area-inset-bottom);
    padding-bottom: max(env(safe-area-inset-bottom), 5px);
}

.mobile-tabbar .tabbar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-color-secondary);
    font-size: 12px;
    transition: all 0.3s ease;
    padding: 8px 0;
    position: relative;
}

.mobile-tabbar .tabbar-item i {
    font-size: 22px;
    margin-bottom: 4px;
    transition: transform 0.3s ease;
}

.mobile-tabbar .tabbar-item span {
    font-size: 11px;
    line-height: 1;
}

.mobile-tabbar .tabbar-item:active i {
    transform: scale(0.9);
}

.mobile-tabbar .tabbar-item.active {
    color: var(--theme-primary);
}

.mobile-tabbar .tabbar-item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--theme-primary);
    border-radius: 0 0 3px 3px;
}

/* 发帖按钮特殊样式 */
.mobile-tabbar .tabbar-item-post {
    position: relative;
}

.mobile-tabbar .tabbar-item-post i {
    font-size: 40px;
    color: var(--theme-primary);
    position: relative;
    top: -15px;
    background: #ffffff;
    border-radius: 50%;
    padding: 5px;
    box-shadow: 0 -2px 10px rgba(102, 126, 234, 0.3);
}

.mobile-tabbar .tabbar-item-post span {
    position: relative;
    top: -10px;
    color: var(--theme-primary);
    font-weight: 600;
}

.mobile-tabbar .tabbar-item-post:active i {
    transform: scale(1.1);
}

/* TabBar动画 */
@keyframes tabbarBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

.mobile-tabbar .tabbar-item-post:active i {
    animation: tabbarBounce 0.3s ease;
}

/* TabBar安全区域适配 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .mobile-tabbar {
        padding-bottom: max(env(safe-area-inset-bottom), 5px);
    }
}

/* ========================================
   浮动按钮区域
   ======================================== */

.float-buttons {
    position: fixed;
    right: 20px;
    bottom: 80px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 9998;
}

.float-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--background-color);
    border: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-color);
    font-size: 18px;
}

.float-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.float-btn:active {
    transform: scale(0.95);
}

.float-btn-top {
    display: none;
}

.float-btn-service {
    background: var(--theme-gradient);
    color: #ffffff;
}

.float-btn-service:hover {
    opacity: 0.9;
}

/* ========================================
   YouTube风格页面跳转进度条
   ======================================== */

.page-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 10000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.page-progress-bar.active {
    opacity: 1;
}

.page-progress-bar.completed {
    opacity: 0;
    transition: opacity 0.3s ease 0.2s;
}

.page-progress-bar.completed .page-progress-indicator {
    width: 100% !important;
}

.page-progress-indicator {
    height: 100%;
    width: 0%;
    background: var(--theme-gradient);
    transition: width 0.3s ease-out;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.page-progress-bar.completing .page-progress-indicator {
    width: 100% !important;
    transition: width 0.3s ease-out;
}

/* 错误状态样式 */
.page-progress-bar.error .page-progress-indicator {
    background: var(--color-danger) !important;
    box-shadow: 0 0 10px rgba(255, 77, 79, 0.5) !important;
}

/* 各应用模块主题色适配 */
body[data-app="news"] .page-progress-indicator {
    background: var(--color-news-gradient);
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

body[data-app="job"] .page-progress-indicator {
    background: var(--color-job-gradient);
    box-shadow: 0 0 10px rgba(17, 153, 142, 0.5);
}

body[data-app="secondhand"] .page-progress-indicator {
    background: var(--color-secondhand-gradient);
    box-shadow: 0 0 10px rgba(0, 201, 183, 0.5);
}

body[data-app="service"] .page-progress-indicator {
    background: var(--color-service-gradient);
    box-shadow: 0 0 10px rgba(79, 172, 254, 0.5);
}

body[data-app="house"] .page-progress-indicator {
    background: var(--color-house-gradient);
    box-shadow: 0 0 10px rgba(250, 112, 154, 0.5);
}

body[data-app="love"] .page-progress-indicator {
    background: var(--color-love-gradient);
    box-shadow: 0 0 10px rgba(255, 64, 129, 0.5);
}

body[data-app="event"] .page-progress-indicator {
    background: var(--color-event-gradient);
    box-shadow: 0 0 10px rgba(229, 91, 19, 0.5);
}