/* 导航栏样式 */
.navbar {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    -moz-backdrop-filter: blur(20px);
    -ms-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
}

/* 为不支持backdrop-filter的浏览器提供回退 */
@supports not (backdrop-filter: blur(20px)) {
    .navbar {
        background: var(--bg-primary-alpha-95);
    }
    
    .navbar.scrolled {
        background: var(--bg-primary-alpha-98);
    }
}

.navbar.scrolled {
    background: var(--bg-primary-alpha-98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-primary);
    box-shadow: 0 2px 20px var(--shadow-medium);
}

.nav-container {
    width: 100%;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

/* 右侧导航区域 */
.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-logo a,
.nav-logo .logo-link {
    text-decoration: none;
    color: inherit;
    display: inline;
}

/* 品牌logo链接悬停时不变色 */
.nav-logo-link:hover {
    color: inherit !important;
}


.nav-logo h2 {
    color: var(--text-inverse);
    font-size: 1.2rem;
    font-weight: 600;
    transition: color 0.3s ease;
    margin: 0;
}

.navbar.scrolled .nav-logo a,
.navbar.scrolled .nav-logo .logo-link {
    color: var(--text-primary);
}

.navbar.scrolled .nav-logo h2 {
    color: var(--text-primary);
}

.nav-logo i {
    margin-right: 8px;
    color: var(--text-inverse);
    transition: color 0.3s ease;
}

.navbar.scrolled .nav-logo i {
    color: var(--primary-color);
}

.nav-subtitle {
    color: var(--text-inverse-secondary);
    font-size: 0.7rem;
    font-weight: 400;
    line-height: 1.2;
    transition: color 0.3s ease, opacity 0.3s ease;
    margin-top: 2px;
    pointer-events: none; /* 确保副标题不可点击 */
    white-space: nowrap; /* 强制单行显示 */
    overflow: hidden; /* 隐藏溢出内容 */
    text-overflow: ellipsis; /* 显示省略号 */
    max-width: 100%; /* 确保不超出容器 */
}

/* 当副标题内容过长需要换行时隐藏 */
.nav-subtitle.hidden-on-wrap {
    opacity: 0;
    visibility: hidden;
}

.navbar.scrolled .nav-subtitle {
    color: var(--text-tertiary);
}

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

.nav-item {
    margin-left: 1rem;
    position: relative;
}

/* 有子菜单的导航项指示器 */
.nav-item.has-submenu > .nav-link::after {
    content: '\f107'; /* Font Awesome down arrow */
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    margin-left: 6px;
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.nav-item.has-submenu:hover > .nav-link::after {
    transform: rotate(180deg);
}

.nav-link {
    color: var(--text-inverse);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.8rem;
    padding: 6px 12px;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.navbar.scrolled .nav-link {
    color: var(--text-secondary);
}

.nav-link:hover {
    color: var(--text-inverse);
    background-color: var(--bg-hover-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.navbar.scrolled .nav-link:hover {
    color: var(--primary-color);
    background-color: var(--primary-alpha-15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* ==========================================
   二级菜单样式 - PC端
   ========================================== */
.nav-submenu {
    position: absolute;
    top: calc(100% + 8px); /* 使用calc避免鼠标移动时的间隙问题 */
    left: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    box-shadow: 0 8px 32px var(--shadow-medium);
    min-width: 200px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    z-index: 1001;
    list-style: none;
}

/* 在父元素上创建一个"桥接区域"，防止鼠标移动时菜单关闭 */
.nav-item.has-submenu::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 8px;
    background: transparent;
}

/* 为不支持backdrop-filter的浏览器提供回退 */
@supports not (backdrop-filter: blur(20px)) {
    .nav-submenu {
        background: var(--bg-primary-alpha-98);
    }
}

.navbar.scrolled .nav-submenu {
    background: var(--bg-primary-alpha-98);
    border-color: var(--border-primary);
}

/* 悬停时显示二级菜单 */
.nav-item.has-submenu:hover .nav-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

/* 二级菜单项 */
.nav-submenu-item {
    margin: 0;
}

.nav-submenu-link {
    display: block;
    color: var(--text-inverse);
    text-decoration: none;
    padding: 10px 20px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.navbar.scrolled .nav-submenu-link {
    color: var(--text-primary);
}

.nav-submenu-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 60%;
    background: var(--primary-color);
    border-radius: 0 4px 4px 0;
    transition: width 0.3s ease;
}

.nav-submenu-link:hover {
    color: var(--text-inverse);
    background-color: var(--primary-alpha-10);
    padding-left: 24px;
}

.nav-submenu-link:hover::before {
    width: 3px;
}

.navbar.scrolled .nav-submenu-link:hover {
    color: var(--primary-color);
    background-color: var(--primary-alpha-15);
}

/* 导航栏操作区域 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 全局搜索按钮 */
.nav-search-btn {
    background: none;
    border: none;
    color: var(--text-inverse);
    font-size: 0.9rem;
    font-weight: 300;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.nav-search-btn:hover {
    color: var(--text-inverse);
    background-color: var(--bg-hover-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transform: translateY(-1px);
}

.navbar.scrolled .nav-search-btn {
    color: var(--text-primary);
}

.navbar.scrolled .nav-search-btn:hover {
    color: var(--primary-color);
    background-color: var(--primary-alpha-15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-inverse);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.navbar.scrolled .bar {
    background-color: var(--text-secondary);
}

/* ==========================================
   响应式设计
   断点说明：
   - PC端：≥1024px（默认样式）
   - iPad端：768px-1023px
   - 手机端：<768px
   ========================================== */

/* 手机端：<768px */
@media (max-width: 767px) {
    /* 移动端隐藏导航副标题 */
    .nav-subtitle {
        display: none;
    }
    
    .nav-menu {
        position: fixed;
        left: 0;
        top: 60px;
        flex-direction: column;
        background: var(--bg-primary-alpha-95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        width: 100%;
        text-align: left;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 4px 20px var(--shadow-medium);
        border-top: 1px solid var(--border-glass-light);
        padding: 1rem 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        z-index: 999;
        pointer-events: none;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
    }

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

    .nav-item {
        margin: 0;
        transform: translateY(20px);
        opacity: 0;
        transition: all 0.3s ease;
        transition-delay: 0.1s;
    }

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

    .nav-menu.active .nav-item:nth-child(1) { transition-delay: 0.1s; }
    .nav-menu.active .nav-item:nth-child(2) { transition-delay: 0.15s; }
    .nav-menu.active .nav-item:nth-child(3) { transition-delay: 0.2s; }
    .nav-menu.active .nav-item:nth-child(4) { transition-delay: 0.25s; }
    .nav-menu.active .nav-item:nth-child(5) { transition-delay: 0.3s; }
    .nav-menu.active .nav-item:nth-child(6) { transition-delay: 0.35s; }
    .nav-menu.active .nav-item:nth-child(7) { transition-delay: 0.4s; }
    .nav-menu.active .nav-item:nth-child(8) { transition-delay: 0.45s; }

    /* 移动端导航项指示器 */
    .nav-item.has-submenu > .nav-link::after {
        margin-left: auto;
        transition: transform 0.3s ease;
    }
    
    .nav-item.has-submenu.active > .nav-link::after {
        transform: rotate(180deg);
    }

    .nav-link {
        color: var(--text-primary);
        padding: 14px 20px;
        margin: 0;
        border-radius: 0;
        display: flex;
        transition: all 0.3s ease;
        justify-content: space-between;
        align-items: center;
        border-left: 3px solid transparent;
    }

    .nav-link:hover {
        color: var(--primary-color);
        background-color: var(--primary-alpha-10);
        transform: none;
        border-left-color: var(--primary-color);
    }

    /* 移动端二级菜单样式 */
    .nav-submenu {
        position: static;
        background: var(--bg-secondary);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        border: none;
        border-radius: 0;
        box-shadow: none;
        margin: 0;
        padding: 0;
        min-width: auto;
        max-height: 0;
        overflow: hidden;
        opacity: 1;
        visibility: visible;
        transform: none;
        pointer-events: auto;
        transition: max-height 0.3s ease;
    }

    .nav-item.has-submenu.active .nav-submenu {
        max-height: 500px;
    }

    .nav-submenu-link {
        color: var(--text-secondary);
        padding: 12px 20px 12px 40px;
        font-size: 0.8rem;
        border-left: 3px solid transparent;
    }

    .nav-submenu-link::before {
        display: none;
    }

    .nav-submenu-link:hover {
        color: var(--primary-color);
        background-color: var(--primary-alpha-10);
        padding-left: 40px;
        border-left-color: var(--primary-color);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-container {
        padding: 0 20px;
    }
    
    /* 移动端右侧导航区域 */
    .nav-right {
        position: relative;
    }
    
    /* 移动端搜索按钮样式调整 */
    .nav-search-btn {
        width: 28px;
        height: 28px;
        font-size: 0.85rem;
        font-weight: 300;
    }
}

/* iPad端：768px - 1023px */
@media (min-width: 768px) and (max-width: 1023px) {
    .nav-container {
        padding: 0 30px;
    }
    
    .nav-item {
        margin-left: 0.75rem;
    }
    
    .nav-link {
        font-size: 0.75rem;
        padding: 6px 10px;
    }
    
    .nav-submenu {
        min-width: 180px;
    }
    
    .nav-submenu-link {
        font-size: 0.75rem;
        padding: 9px 16px;
    }
}

/* ==========================================
   全局搜索弹窗样式 - 毛玻璃风格
   ========================================== */

/* 搜索弹窗遮罩 */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-modal.active {
    display: flex;
    opacity: 1;
}

.search-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* 搜索弹窗内容 - 白色毛玻璃效果 */
.search-modal-content {
    position: relative;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 20px;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.5);
    margin: auto;
    width: 90%;
    max-width: 580px;
    max-height: 85vh;
    overflow: hidden;
    transform: scale(0.95) translateY(20px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-modal.active .search-modal-content {
    transform: scale(1) translateY(0);
}

/* 简化的搜索弹窗主体 */
.search-modal-body {
    padding: 32px;
}

/* 全局搜索表单 - 毛玻璃风格 */
.global-search-form {
    margin-bottom: 32px;
}

.search-input-container {
    display: flex;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.search-input-container:focus-within {
    border-color: rgba(77, 125, 255, 0.5);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 
        0 0 0 3px rgba(77, 125, 255, 0.1),
        0 8px 32px rgba(77, 125, 255, 0.15);
}

#globalSearchInput {
    flex: 1;
    padding: 18px 24px;
    border: none;
    background: transparent;
    color: #333;
    font-size: 1.1rem;
    outline: none;
    font-weight: 400;
}

#globalSearchInput::placeholder {
    color: rgba(0, 0, 0, 0.5);
    font-weight: 300;
}

.search-submit-btn {
    padding: 18px 24px;
    background: rgba(77, 125, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 70px;
    font-weight: 500;
}

.search-submit-btn:hover {
    background: rgba(77, 125, 255, 1);
    transform: scale(1.05);
}

/* 搜索建议区域 - 毛玻璃风格 */
.search-suggestions {
    margin-top: 24px;
}

.hot-searches {
    margin-bottom: 0;
}

.suggestions-label {
    display: block;
    color: rgba(0, 0, 0, 0.7);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 16px;
    text-align: center;
}

.hot-search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.hot-search-tag {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: rgba(0, 0, 0, 0.8);
    padding: 10px 16px;
    border-radius: 25px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(0, 0, 0, 0.1);
    font-weight: 400;
    position: relative;
    overflow: hidden;
}

.hot-search-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.hot-search-tag:hover::before {
    left: 100%;
}

.hot-search-tag:hover {
    background: rgba(77, 125, 255, 0.6);
    color: white;
    border-color: rgba(77, 125, 255, 0.8);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(77, 125, 255, 0.3);
}

/* 手机端适配：<768px */
@media (max-width: 767px) {
    .search-modal-content {
        width: 95%;
        margin: 20px auto;
        max-height: 90vh;
        border-radius: 16px;
    }
    
    .search-modal-body {
        padding: 24px;
    }
    
    .search-input-container {
        border-radius: 12px;
    }
    
    #globalSearchInput {
        padding: 16px 20px;
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .search-submit-btn {
        padding: 16px 20px;
        min-width: 60px;
    }
    
    .hot-search-tags {
        gap: 8px;
    }
    
    .hot-search-tag {
        font-size: 0.85rem;
        padding: 8px 14px;
        border-radius: 20px;
    }
}