/* ===== CSS变量定义 ===== */
:root {
    /* 颜色变量 */
    --color-bg: #FFFFFF;
    --color-text: #333333;
    --color-card-bg: #F8F9FA;
    --color-border: #E9ECEF;
    --color-primary: #1a56db;
    --color-secondary: #1e40af;
    --color-accent: #FF8C00;
    --color-muted: #6C757D;
    --color-header-bg: white;
    --color-footer-bg: #0F172A;
    --color-footer-text: #E9ECEF;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-overlay: rgba(0, 0, 0, 0.5);
    --color-sidebar-icon: #4b5563;
    --color-sidebar-icon-active: #1a56db;
    --color-video-overlay: rgba(0, 0, 0, 0.6);
    
    /* 布局变量 */
    --layout-topbar-height: 38px;
    --layout-header-height: 60px;
    --layout-footer-height: 62px;
    --layout-sidebar-width: 180px;
    --layout-sidebar-collapsed: 50px;
    --layout-mobile-sidebar: 220px;
    --layout-banner-height: 500px;
    --layout-mobile-banner: 350px;
    --layout-nav-min: 400px;
    --layout-nav-max: 800px;
    --layout-nav-right-min: 300px;
    
    /* 动画变量 */
    --animation-speed-fast: 0.2s;
    --animation-speed-normal: 0.3s;
    --animation-speed-slow: 0.5s;
    --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 字体变量（工业 / 外贸 / 英文为主） */
    --font-family-base: "Inter", 
                        -apple-system, BlinkMacSystemFont,
                        "Segoe UI", Roboto, Arial,
                        "Noto Sans SC", 
                        "PingFang SC", "Microsoft YaHei",
                        sans-serif;
    
    /* 字号体系（工程官网友好） */
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 22px;
    --font-size-3xl: 26px;
    --font-size-4xl: 34px;
    
    /* 字重体系（克制、专业） */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* 间距变量 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 30px;
    --spacing-4xl: 40px;
    
    /* 圆角变量 */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 50%;
    
    /* 阴影变量 */
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
    
    /* 层级变量 */
    --z-index-dropdown: 1000;
    --z-index-header: 1100;
    --z-index-overlay: 1200;
    --z-index-modal: 9999;
    --z-index-tooltip: 10000;
}

/* 深色主题变量 */
[data-theme="dark"] {
    --color-bg: #0F172A;
    --color-text: #E2E8F0;
    --color-card-bg: #1E293B;
    --color-border: #334155;
    --color-primary: #60A5FA;
    --color-secondary: #93C5FD;
    --color-accent: #FB923C;
    --color-muted: #94A3B8;
    --color-header-bg: #1E293B;
    --color-footer-bg: #0F172A;
    --color-footer-text: #CBD5E1;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(0, 0, 0, 0.7);
    --color-sidebar-icon: #9ca3af;
    --color-sidebar-icon-active: #60A5FA;
    --color-video-overlay: rgba(0, 0, 0, 0.7);
    --mobile-header-height: 58px;
    --mobile-search-height: 32px;
}

/* ===== 统一 Dropdown 行为层 ===== */
.dropdown-panel {
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: none;
}

.dropdown-open > .dropdown-panel,
.dropdown-open .dropdown-panel {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.dropdown-arrow {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dropdown-open .dropdown-arrow {
    transform: rotate(180deg);
}

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html, body {
    overflow-x: hidden;
    max-width: 100%;
    width: 100%;
}

html {
    overflow-y: scroll;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-card-bg);
    scrollbar-gutter: stable;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-card-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-secondary);
}

/* ===== 基础元素样式 ===== */
body {
    font-family: var(--font-family-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-weight: var(--font-weight-normal);
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--animation-speed-normal) ease, 
               color var(--animation-speed-normal) ease;
    width: 100%;
    padding-top: var(--layout-header-height);
}

body.has-topbar {
    padding-top: calc(var(--layout-topbar-height) + var(--layout-header-height));
}

.no-scroll {
    position: fixed;
    left: 0;
    right: 0;
    overflow: hidden !important;
}

a {
    color: #ffffff;
    text-decoration: none;
    transition: color var(--animation-speed-normal) ease;
}

h1, h2, h3 {
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.01em;
}

button, 
input, 
textarea {
    font-family: inherit;
    font-size: inherit;
}

/* 实用工具类 */
.mobile-hide {
    display: none !important;
}

@media (min-width: 769px) {
    .mobile-hide {
        display: block !important;
    }
}

/* ===== 布局容器 ===== */
.main-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.main-content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-left: 180px;
    transition: margin-left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    width: calc(100% - 180px);
    min-height: 100vh;
    overflow-x: hidden;
}

.content-layout {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
}

.main-content {
    padding: var(--spacing-2xl) var(--spacing-sm) calc(var(--layout-footer-height) + var(--spacing-lg));
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

/* ===== 顶部信息栏 ===== */
.top-bar {
    background-color: var(--color-primary);
    color: white;
    height: var(--layout-topbar-height);
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    font-size: var(--font-size-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-index-overlay);
    transform: translateY(0);
    transition: transform 0.4s var(--animation-easing);
    box-shadow: var(--shadow-sm);
}

@media (min-width: 769px) {
    .top-bar {
        display: flex;
    }
}

.top-bar.hidden {
    transform: translateY(-100%);
}

.top-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

.welcome-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.welcome-text i {
    font-size: var(--font-size-md);
}

.top-bar-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.social-icon {
    color: white;
    font-size: var(--font-size-md);
    transition: all var(--animation-speed-fast);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
}

.social-icon:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.company-email {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: white;
    transition: color var(--animation-speed-fast);
}

.company-email:hover {
    color: rgba(255, 255, 255, 0.9);
}

.company-email i {
    font-size: var(--font-size-sm);
}

.top-contact-buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.top-contact-link {
    font-size: var(--font-size-sm);
    color: white;
    transition: all var(--animation-speed-fast);
    cursor: pointer;
    white-space: nowrap;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.1);
}

.top-contact-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.top-contact-link.quote {
    background: #1f63eb;
    color: #ffffff;
    font-weight: var(--font-weight-medium);
    border: 1px solid #1f63eb;
}

.top-contact-link.quote:hover {
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-secondary);
}

/* ===== 顶部栏语言选择器样式 ===== */
.top-bar .language-selector {
    position: relative;
    flex-shrink: 0;
}

.top-bar .language-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--color-primary);
    font-size: 11px;
    white-space: nowrap;
    flex-shrink: 0;
    border: none;
    outline: none;
    background: #1f63eb;
    border: 1px solid #1f63eb;
    font-weight: 500;
    height: 28px;
    line-height: 1;
    margin: 0;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.top-bar .language-btn:hover {
    color: var(--color-secondary);
    background: white;
    border-color: var(--color-primary);
    box-shadow: 0 3px 10px rgba(26, 86, 219, 0.15);
    transform: translateY(-1px);
}

.top-bar .language-btn:active {
    transform: translateY(0);
    transition-duration: 0.1s;
    box-shadow: 0 1px 2px rgba(26, 86, 219, 0.1);
}

.top-bar .language-btn i.fa-globe {
    font-size: 12px;
    color: #ffffff;
    position: relative;
    transition: all 0.25s ease;
    text-shadow: 
        0 0 1px rgba(26, 86, 219, 0.2),
        0 0 2px rgba(26, 86, 219, 0.1);
}

.top-bar .language-btn:hover i.fa-globe {
    color: var(--color-secondary);
    text-shadow: 
        0 0 2px rgba(30, 64, 175, 0.3),
        0 0 4px rgba(30, 64, 175, 0.15);
    transform: scale(1.05);
}

.top-bar .language-btn i.arrow {
    font-size: 8px;
    margin-left: 3px;
    color: var(--color-primary);
    opacity: 0.7;
    transition: all 0.2s ease;
}

.top-bar .language-btn:hover i.arrow {
    color: var(--color-secondary);
    opacity: 1;
}

.top-bar .language-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.03);
    padding: 6px 0;
    min-width: 140px;
    z-index: 2000;
    border: none;
    overflow: hidden;
    backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.top-bar .language-selector.dropdown-open .language-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

[data-theme="dark"] .top-bar .language-dropdown {
    background: rgba(30, 30, 40, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.top-bar .language-item {
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #333;
    text-decoration: none;
    transition: all 0.15s ease;
    white-space: nowrap;
    font-size: 13px;
    font-weight: 400;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .top-bar .language-item {
    color: rgba(255, 255, 255, 0.85);
}

.top-bar .language-item:hover {
    background: rgba(26, 86, 219, 0.06);
}

.top-bar .language-item.active {
    background: rgba(26, 86, 219, 0.1);
    color: var(--color-primary);
    font-weight: 500;
}

.top-bar .flag-icon {
    width: 18px;
    height: 14px;
    border-radius: 2px;
    display: inline-block;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.top-bar .language-name {
    flex: 1;
    font-weight: 400;
    font-size: 13px;
}

[data-theme="dark"] .top-bar .language-btn {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(26, 86, 219, 0.3);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .top-bar .language-btn:hover {
    background: white;
    border-color: var(--color-primary);
    box-shadow: 0 3px 10px rgba(26, 86, 219, 0.2);
}

[data-theme="dark"] .top-bar .language-btn i.fa-globe {
    color: var(--color-primary);
}

[data-theme="dark"] .top-bar .language-btn:hover i.fa-globe {
    color: var(--color-secondary);
}

[data-theme="dark"] .top-bar .language-btn i.arrow {
    color: var(--color-primary);
}

[data-theme="dark"] .top-bar .language-btn:hover i.arrow {
    color: var(--color-secondary);
}

@keyframes gentleFloat {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-1px);
    }
    100% {
        transform: translateY(0);
    }
}

.top-bar .language-btn:hover {
    animation: gentleFloat 2s ease-in-out infinite;
}

@media (max-width: 480px) {
    .top-bar .language-btn {
        padding: 4px 10px;
        font-size: 10px;
        height: 26px;
        gap: 4px;
    }
    
    .top-bar .language-btn i.fa-globe {
        font-size: 11px;
    }
    
    .top-bar .language-dropdown {
        min-width: 120px;
    }
    
    .top-bar .language-item {
        padding: 6px 12px;
        font-size: 12px;
        gap: 8px;
    }
}

.top-bar .language-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 16px;
    background: linear-gradient(135deg, 
        rgba(26, 86, 219, 0.05) 0%, 
        rgba(26, 86, 219, 0) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.top-bar .language-btn:hover::before {
    opacity: 1;
}

.top-bar .language-dropdown .language-item:not(:last-child) {
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .top-bar .language-dropdown .language-item:not(:last-child) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.top-bar .language-btn .language-text {
    color: #ffffff;
    transition: color 0.25s ease;
}

.top-bar .language-btn:hover .language-text {
    color: var(--color-secondary);
}

/* ===== 顶部栏主题切换按钮 ===== */
.top-bar-theme-toggle {
    background: none;
    border: none;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: background-color var(--animation-speed-fast), color var(--animation-speed-fast);
    border-radius: var(--radius-full);
    font-size: var(--font-size-md);
    touch-action: manipulation;
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.top-bar-theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* ===== 重构后的主导航栏布局 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--layout-header-height);
    background-color: var(--color-header-bg);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    z-index: var(--z-index-header);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: transform 0.4s var(--animation-easing), top 0.4s var(--animation-easing);
    padding: 0 var(--spacing-lg);
    transform: translateY(0);
    will-change: transform;
    gap: var(--spacing-lg);
}

@media (min-width: 769px) {
    .header {
        top: var(--layout-topbar-height);
    }
    
    .header.scrolled-up {
        top: 0;
    }
}

.header.hidden {
    transform: translateY(-100%);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: flex-start;
    flex-shrink: 0;
    min-width: 0;
}

.menu-toggle {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    cursor: pointer;
    transition: background-color var(--animation-speed-fast);
    touch-action: manipulation;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.menu-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: opacity var(--animation-speed-fast);
    height: 40px;
    flex-shrink: 0;
}

.logo:hover {
    opacity: 0.8;
}

.logo-img {
    height: 100%;
    width: auto;
    max-width: 160px;
    object-fit: contain;
    transition: transform var(--animation-speed-normal) ease;
}

.city-selector {
    position: relative;
    flex-shrink: 0;
    z-index: var(--z-index-dropdown);
    display: none;
}

@media (min-width: 769px) {
    .city-selector {
        display: block;
    }
}

.city-selector-btn {
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    cursor: pointer;
    transition: color var(--animation-speed-normal), background-color var(--animation-speed-normal);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.city-selector-btn:hover {
    color: var(--color-primary);
    background: rgba(0, 0, 0, 0.05);
}

.city-selector-btn i {
    font-size: 10px;
    color: var(--color-primary);
}

.city-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    width: 240px;
    background: var(--color-card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 0;
    z-index: var(--z-index-dropdown);
    overflow: hidden;
    margin-top: var(--spacing-xs);
    border: 1px solid var(--color-border);
}

@supports (backdrop-filter: blur(8px)) {
    .city-dropdown {
        backdrop-filter: blur(8px);
        background-color: rgba(255, 255, 255, 0.95);
    }
    
    [data-theme="dark"] .city-dropdown {
        background-color: rgba(30, 41, 59, 0.95);
    }
}

.city-section {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.city-section:last-child {
    border-bottom: none;
}

.city-section-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-muted);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.city-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
}

.city-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) 2px;
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: color var(--animation-speed-fast), background-color var(--animation-speed-fast);
    border-radius: var(--radius-sm);
    text-decoration: none;
    text-align: center;
    min-height: 32px;
    line-height: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.city-item:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--color-primary);
}

.city-item.active {
    background: var(--color-primary);
    color: white;
    font-weight: var(--font-weight-medium);
}

.city-item.hot-city {
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
}

.city-item.hot-city:hover {
    background: rgba(26, 86, 219, 0.1);
    color: var(--color-secondary);
}

.city-item.hot-city.active {
    background: var(--color-primary);
    color: white;
}

.main-nav-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    position: relative;
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    height: 100%;
    width: 100%;
    max-width: var(--layout-nav-max);
    margin: 0 auto;
    padding-right: var(--spacing-lg);
    margin-left: 80px;
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    height: 100%;
    width: 100%;
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-md);
    color: #7a889c;
    border-radius: var(--radius-md);
    transition: color var(--animation-speed-fast), background-color var(--animation-speed-fast);
    white-space: nowrap;
    position: relative;
    font-weight: var(--font-weight-medium);
    text-align: center;
    flex-shrink: 0;
    height: 100%;
    display: flex;
    align-items: center;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 12px;
    right: 12px;
    height: 2px;
    background-color: var(--color-primary);
    transform: scaleX(0);
    transform-origin: bottom center;
    transition: transform var(--animation-speed-normal) ease;
}

.nav-link:hover {
    color: var(--color-secondary);
    background-color: rgba(26, 86, 219, 0.05);
}

.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-link.active {
    color: var(--color-secondary);
    font-weight: var(--font-weight-bold);
    background-color: rgba(26, 86, 219, 0.08);
}

.nav-link.active::after {
    transform: scaleX(1);
}

.has-dropdown {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

.has-dropdown .nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    height: 100%;
}

.has-dropdown .nav-link i.arrow {
    font-size: 10px;
    flex-shrink: 0;
}

.mega-dropdown {
    position: absolute;
    top: 100%;
    background: var(--color-bg);
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    padding: 0;
    z-index: var(--z-index-dropdown);
    margin-top: var(--spacing-xs);
    border: 1px solid rgba(0, 0, 0, 0.08);
    overflow: hidden;
    min-width: 280px;
}

@supports (backdrop-filter: blur(8px)) {
    .mega-dropdown {
        backdrop-filter: blur(8px);
        background-color: rgba(255, 255, 255, 0.95);
    }
    
    [data-theme="dark"] .mega-dropdown {
        background-color: rgba(30, 41, 59, 0.95);
    }
}

[data-theme="dark"] .mega-dropdown {
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.has-dropdown .mega-dropdown {
    width: 720px;
    left: 0;
    transform: none;
}

.has-dropdown.active .nav-link {
    color: var(--color-primary);
    background: rgba(26, 86, 219, 0.05);
}

.has-dropdown.active .nav-link::after {
    transform: scaleX(1);
}

.mega-content {
    display: flex;
    min-height: 320px;
}

.mega-categories {
    width: 200px;
    background: var(--color-card-bg);
    padding: 18px 0;
    border-right: 1px solid var(--color-border);
    flex-shrink: 0;
}

.mega-category-item {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: color 0.3s var(--animation-easing), background-color 0.3s var(--animation-easing), border-left-color 0.3s var(--animation-easing);
    color: var(--color-text);
    border-left: 3px solid transparent;
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    text-decoration: none;
}

.mega-category-item:hover,
.mega-category-item.active {
    background: rgba(26, 86, 219, 0.08);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

.mega-category-item i {
    width: 16px;
    text-align: center;
    font-size: var(--font-size-md);
    color: var(--color-primary);
    flex-shrink: 0;
}

.mega-category-name {
    font-size: 13px;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mega-subcategories {
    flex: 1;
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    align-content: start;
    width: 100%;
}

.category-content {
    display: none;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-xs) 0;
}

.category-content.active {
    display: grid;
}

.mega-subcategory {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: transform 0.3s var(--animation-easing);
    height: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid transparent;
}

@media (hover: hover) and (pointer: fine) {
    .mega-subcategory:hover {
        transform: translateY(-3px);
        border-color: rgba(26, 86, 219, 0.1);
        box-shadow: var(--shadow-md);
    }
}

.subcategory-image {
    width: 100%;
    height: 100px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-card-bg);
    flex-shrink: 0;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.subcategory-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--animation-speed-slow) var(--animation-easing);
}

.mega-subcategory:hover .subcategory-image img {
    transform: scale(1.05);
}

.subcategory-info {
    padding: var(--spacing-xs) 0;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.subcategory-title {
    font-size: 13px;
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.subcategory-title a {
    color: inherit;
    text-decoration: none;
    display: block;
    width: 100%;
    height: 100%;
}

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

.subcategory-desc {
    font-size: 11px;
    color: var(--color-muted);
    line-height: 1.4;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.mega-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-card-bg);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.view-all-link {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: color var(--animation-speed-normal) ease, gap var(--animation-speed-normal) ease;
    font-size: 13px;
    white-space: nowrap;
    text-decoration: none;
}

.view-all-link:hover {
    gap: var(--spacing-sm);
    color: var(--color-secondary);
}

/* ===== 右侧区域 - 在最右边 ===== */
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
    justify-content: flex-end;
    min-width: 0;
}

.search-container {
    position: relative;
    flex-shrink: 0;
}

.desktop-search {
    display: flex;
}

.search-input {
    flex: 1;
    height: 36px;
    background: var(--color-bg);
    border: 1px solid var(--color-primary);
    border-radius: 18px 0 0 18px;
    padding: 0 var(--spacing-md);
    color: var(--color-text);
    font-size: 13px;
    outline: none;
    transition: border-color var(--animation-speed-fast);
    min-width: 140px;
}

.search-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(26, 86, 219, 0.1);
}

.search-btn {
    background: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-left: none;
    border-radius: 0 18px 18px 0;
    width: 44px;
    height: 36px;
    cursor: pointer;
    color: white;
    font-size: 13px;
    transition: background-color var(--animation-speed-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.search-btn:hover {
    background: var(--color-secondary);
}

@media (max-width: 768px) {
    .search-container {
        flex: 1;
        max-width: 180px;
        margin-right: var(--spacing-sm);
    }
    
    .desktop-search {
        display: flex !important;
        width: 100%;
    }
    
    .search-input {
        min-width: 100px;
        flex: 1;
        font-size: var(--font-size-sm);
        padding: 0 var(--spacing-sm);
    }
    
    .search-btn {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-sm);
    }
    
    .mobile-search-trigger {
        display: none !important;
    }
    
    .mobile-search-overlay {
        display: none !important;
    }
}

.mobile-search-trigger {
    display: none;
    background: none;
    border: none;
    width: 36px;
    height: 36px;
    color: var(--color-primary);
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: background-color var(--animation-speed-fast);
    flex-shrink: 0;
}

.mobile-search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--layout-header-height);
    background-color: var(--color-header-bg);
    z-index: 1300;
    transform: translateY(-100%);
    transition: transform var(--animation-speed-normal) ease;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
}

.mobile-search-overlay.active {
    transform: translateY(0);
}

.back-btn {
    background: none;
    border: none;
    color: var(--color-text);
    font-size: var(--font-size-xl);
    margin-right: var(--spacing-md);
    cursor: pointer;
    transition: color var(--animation-speed-fast), background-color var(--animation-speed-fast);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    touch-action: manipulation;
    flex-shrink: 0;
}

.back-btn:hover {
    color: var(--color-primary);
    background: rgba(0, 0, 0, 0.05);
}

.mobile-search-input {
    flex: 1;
    height: 36px;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    padding: 0 var(--spacing-md);
    color: var(--color-text);
    font-size: 15px;
    outline: none;
    transition: border-color var(--animation-speed-fast), background-color var(--animation-speed-fast);
    min-width: 0;
}

.mobile-search-input:focus {
    border-color: var(--color-primary);
    background: rgba(0, 0, 0, 0.03);
    box-shadow: 0 0 0 2px rgba(26, 86, 219, 0.1);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.flag-icon {
    width: 20px;
    height: 15px;
    border-radius: 2px;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.flag-cn {
    background: #DE2910;
}

.flag-cn::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 4px;
    height: 4px;
    background: #FFDE00;
    border-radius: 50%;
}

.flag-cn::after {
    content: '★';
    position: absolute;
    top: 1px;
    left: 5px;
    color: #FFDE00;
    font-size: 8px;
}

.flag-us {
    background: linear-gradient(
        to bottom,
        #B22234 33%,
        #FFFFFF 33%,
        #FFFFFF 66%,
        #B22234 66%
    );
}

.flag-us::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 8px;
    height: 8px;
    background: #3C3B6E;
}

.flag-es {
    background: linear-gradient(
        to bottom,
        #C60B1E 33%,
        #FFC400 33%,
        #FFC400 66%,
        #C60B1E 66%
    );
}

.flag-ru {
    background: linear-gradient(
        to bottom,
        #FFFFFF 33%,
        #0039A6 33%,
        #0039A6 66%,
        #D52B1E 66%
    );
}

.flag-de {
    background: linear-gradient(
        to bottom,
        #000000 33%,
        #DD0000 33%,
        #DD0000 66%,
        #FFCE00 66%
    );
}

.flag-fr {
    background: linear-gradient(
        to right,
        #002654 33%,
        #FFFFFF 33%,
        #FFFFFF 66%,
        #ED2939 66%
    );
}

.flag-jp {
    background: #FFFFFF;
}

.flag-jp::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background: #BC002D;
    border-radius: 50%;
}

.flag-kr {
    background: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
}

.flag-kr::before {
    content: '☯';
    font-size: 8px;
    color: #000000;
    transform: rotate(45deg);
}

@media (max-width: 768px) {
    .header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 var(--spacing-sm);
        height: var(--mobile-header-height);
        gap: 4px;
    }
    
    .header-left {
        flex: 0 0 auto;
        order: 1;
        min-width: 0;
        gap: 8px;
    }
    
    .menu-toggle {
        width: 28px;
        height: 28px;
        margin-right: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--color-primary);
        border-radius: var(--radius-sm);
        background: rgba(26, 86, 219, 0.05);
    }
    
    .logo-container {
        height: 32px;
        min-width: 0;
        flex-shrink: 0;
    }
    
    .logo {
        height: 32px;
        display: flex;
        align-items: center;
    }
    
    .logo-img {
        height: 32px;
        width: auto;
        max-width: 120px;
        object-fit: contain;
    }
    
    .city-selector {
        display: block !important;
        flex-shrink: 0;
    }
    
    .city-selector-btn {
        padding: 4px 8px;
        font-size: 11px;
        height: 24px;
        line-height: 16px;
        border: 1px solid var(--color-border);
        border-radius: 12px;
        background: rgba(26, 86, 219, 0.05);
        color: var(--color-primary);
    }
    
    .city-selector-btn i {
        font-size: 8px;
        margin-left: 2px;
    }
    
    .main-nav-container {
        display: none;
    }
    
    .header-right {
        flex: 1;
        order: 2;
        justify-content: flex-end;
        min-width: 0;
        gap: 4px;
        margin-left: 0;
        padding-left: 4px;
    }
    
    .search-container {
        position: relative;
        flex: 1;
        max-width: 180px;
        margin-right: 0;
        min-width: 120px;
    }
    
    .desktop-search {
        display: flex !important;
        width: 100%;
        height: var(--mobile-search-height);
        background: rgba(26, 86, 219, 0.05);
        border-radius: 16px;
        overflow: hidden;
        border: 1px solid var(--color-border);
        transition: border-color var(--animation-speed-fast) ease;
    }
    
    .desktop-search:focus-within {
        border-color: var(--color-primary);
        box-shadow: 0 0 0 2px rgba(26, 86, 219, 0.1);
    }
    
    .search-input {
        flex: 1;
        height: 100%;
        min-width: 0;
        font-size: 12px;
        padding: 0 12px;
        background: transparent;
        border: none;
        border-radius: 0;
        color: var(--color-text);
        outline: none;
        font-weight: var(--font-weight-normal);
    }
    
    .search-input::placeholder {
        color: var(--color-muted);
        opacity: 0.8;
    }
    
    .search-btn {
        width: 36px;
        height: 100%;
        background: var(--color-primary);
        border: none;
        border-radius: 0 15px 15px 0;
        color: white;
        font-size: 12px;
        cursor: pointer;
        transition: background-color var(--animation-speed-normal);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
    }
    
    .search-btn:hover {
        background: var(--color-secondary);
    }
    
    .search-btn i {
        font-size: 12px;
    }
    
    .mobile-search-trigger,
    .mobile-search-overlay {
        display: none !important;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0 8px;
        height: 54px;
    }
    
    .logo-img {
        max-width: 100px;
    }
    
    .city-selector-btn {
        font-size: 10px;
        padding: 3px 6px;
        height: 22px;
        line-height: 14px;
    }
    
    .search-container {
        max-width: 140px;
        min-width: 100px;
    }
    
    .desktop-search {
        height: 28px;
        border-radius: 14px;
    }
    
    .search-input {
        font-size: 11px;
        padding: 0 10px;
    }
    
    .search-btn {
        width: 32px;
        font-size: 11px;
    }
    
    .search-btn i {
        font-size: 11px;
    }
    
    .menu-toggle {
        width: 26px;
        height: 26px;
    }
}

/* ===== 重新设计的侧边栏导航样式 ===== */
.sidebar {
    position: fixed;
    top: var(--layout-header-height);
    left: 0;
    bottom: 0;
    width: var(--layout-sidebar-width);
    background-color: var(--color-bg);
    z-index: 200;
    overflow-x: hidden;
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    transition: width var(--animation-speed-normal) cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: flex;
    flex-direction: column;
    -webkit-overflow-scrolling: touch;
}

body.has-topbar .sidebar {
    top: calc(var(--layout-topbar-height) + var(--layout-header-height));
    height: calc(100vh - var(--layout-topbar-height) - var(--layout-header-height));
}

body.sidebar-collapsed .sidebar {
    width: var(--layout-sidebar-collapsed);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.sidebar-content::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0 var(--spacing-xs) var(--spacing-xs);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--animation-speed-normal) ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.sidebar-item i {
    font-size: var(--font-size-lg);
    min-width: 24px;
    text-align: center;
    color: var(--color-sidebar-icon);
    transition: color var(--animation-speed-normal) ease;
    flex-shrink: 0;
}

.sidebar-item span {
    margin-left: var(--spacing-md);
    transition: opacity var(--animation-speed-normal) ease, 
                margin-left var(--animation-speed-normal) ease;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.sidebar-item:hover {
    background: rgba(26, 86, 219, 0.08);
    color: var(--color-primary);
}

.sidebar-item:hover i {
    color: var(--color-primary);
}

.sidebar-item.active {
    background: rgba(26, 86, 219, 0.1);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.sidebar-item.active i {
    color: var(--color-primary);
}

.sidebar-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-md) var(--spacing-lg);
    transition: all var(--animation-speed-normal) ease;
}

.sidebar-section {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-xs);
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: var(--font-weight-medium);
    transition: all var(--animation-speed-normal) ease;
    white-space: nowrap;
    overflow: hidden;
}

body.sidebar-collapsed .sidebar-item {
    justify-content: center;
    padding: var(--spacing-md) 0;
    margin: 0 auto var(--spacing-xs);
    width: 36px;
}

body.sidebar-collapsed .sidebar-item span {
    opacity: 0;
    margin-left: 0;
    width: 0;
    position: absolute;
}

body.sidebar-collapsed .sidebar-item i {
    margin: 0;
}

body.sidebar-collapsed .sidebar-divider {
    margin: var(--spacing-md) auto;
    width: 28px;
}

body.sidebar-collapsed .sidebar-section {
    opacity: 0;
    height: 0;
    padding: 0;
    margin: 0;
    overflow: hidden;
}

.category-nav {
    padding: 0 var(--spacing-md);
    transition: padding var(--animation-speed-normal) ease;
}

.category-item {
    margin-bottom: var(--spacing-xs);
}

.category-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--animation-speed-normal) ease;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.category-header i {
    font-size: var(--font-size-md);
    min-width: 20px;
    text-align: center;
    color: var(--color-sidebar-icon);
    transition: color var(--animation-speed-normal) ease;
    flex-shrink: 0;
}

.category-header span {
    margin-left: var(--spacing-md);
    transition: opacity var(--animation-speed-normal) ease, 
                margin-left var(--animation-speed-normal) ease;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.category-toggle {
    margin-left: auto;
    transition: transform var(--animation-speed-normal) ease, 
                opacity var(--animation-speed-normal) ease;
    color: var(--color-muted);
    font-size: 10px;
    flex-shrink: 0;
}

.category-toggle i {
    min-width: auto;
}

.category-header:hover {
    background: rgba(26, 86, 219, 0.08);
    color: var(--color-primary);
}

.category-header:hover i {
    color: var(--color-primary);
}

.category-header.active {
    background: rgba(26, 86, 219, 0.1);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.category-header.active i {
    color: var(--color-primary);
}

.category-header.active .category-toggle {
    transform: rotate(180deg);
}

.subcategories {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--animation-speed-normal) ease,
                padding var(--animation-speed-normal) ease;
    padding: 0 var(--spacing-md);
}

.category-header.active + .subcategories {
    max-height: 400px;
    padding: var(--spacing-xs) var(--spacing-md);
}

.subcategory {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: 2px;
    font-size: var(--font-size-xs);
    color: var(--color-muted);
    border-radius: var(--radius-sm);
    transition: all var(--animation-speed-fast) ease;
    text-decoration: none;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.subcategory:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--color-text);
}

.subcategory.active {
    background: var(--color-primary);
    color: white;
    font-weight: var(--font-weight-medium);
}

body.sidebar-collapsed .category-nav {
    padding: 0;
}

body.sidebar-collapsed .category-header {
    justify-content: center;
    padding: var(--spacing-sm) 0;
    width: 36px;
    margin: 0 auto var(--spacing-xs);
}

body.sidebar-collapsed .category-header span {
    opacity: 0;
    margin-left: 0;
    width: 0;
    position: absolute;
}

body.sidebar-collapsed .category-header i {
    margin: 0;
}

body.sidebar-collapsed .category-toggle {
    opacity: 0;
    position: absolute;
}

body.sidebar-collapsed .subcategories {
    display: none;
}

body.sidebar-collapsed .main-content-wrapper {
    margin-left: var(--layout-sidebar-collapsed);
    width: calc(100% - var(--layout-sidebar-collapsed));
}

@media (max-width: 768px) {
    .sidebar {
        width: var(--layout-mobile-sidebar);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content-wrapper {
        margin-left: 0 !important;
        width: 100% !important;
        transition: none;
    }
    
    body.sidebar-collapsed .sidebar {
        transform: translateX(-100%);
    }
    
    body.sidebar-collapsed .main-content-wrapper {
        margin-left: 0 !important;
        width: 100% !important;
    }
    
    .sidebar-item {
        justify-content: flex-start;
    }
    
    .sidebar-item span {
        opacity: 1 !important;
        margin-left: var(--spacing-md) !important;
        width: auto !important;
        position: relative !important;
    }
    
    .category-header {
        justify-content: flex-start;
    }
    
    .category-header span {
        opacity: 1 !important;
        margin-left: var(--spacing-md) !important;
        width: auto !important;
        position: relative !important;
    }
    
    .category-toggle {
        opacity: 1 !important;
        position: relative !important;
    }
    
    .sidebar-divider {
        margin: var(--spacing-md) var(--spacing-lg) !important;
        width: auto !important;
    }
    
    .sidebar-section {
        opacity: 1 !important;
        height: auto !important;
        padding: var(--spacing-md) var(--spacing-lg) !important;
        margin: 0 !important;
    }
    
    .subcategories {
        display: block !important;
    }
}

/* ===== 移动端底部导航栏 ===== */
.mobile-tabbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--layout-footer-height);
    background-color: var(--color-header-bg);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -2px 10px var(--color-shadow);
    transition: background-color var(--animation-speed-normal) ease;
    padding: var(--spacing-sm) 0;
    will-change: transform;
}

@media (min-width: 769px) {
    .mobile-tabbar {
        display: none;
    }
}

.tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 20%;
    height: 100%;
    cursor: pointer;
    transition: color var(--animation-speed-fast);
    color: var(--color-muted);
    font-size: var(--font-size-xs);
    position: relative;
    touch-action: manipulation;
    padding: var(--spacing-xs) 0;
    border-radius: var(--radius-lg);
    flex: 1;
}

.tab-item.active {
    color: var(--color-primary);
    background: rgba(26, 86, 219, 0.05);
}

.tab-item i {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
    transition: color var(--animation-speed-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: transparent;
}

.tab-item.active i {
    color: var(--color-primary);
    background: rgba(26, 86, 219, 0.1);
}

.tab-item:hover {
    color: var(--color-primary);
}

.tab-item.active::after {
    content: '';
    position: absolute;
    top: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 1.5px;
}

/* ===== 视频弹窗样式 ===== */
.video-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: var(--z-index-modal);
    display: none;
    opacity: 0;
    transition: opacity var(--animation-speed-normal) ease;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
}

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

.video-modal-container {
    position: relative;
    width: 90%;
    max-width: 1200px;
    background: #000;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    aspect-ratio: 16/9;
    max-height: 90vh;
}

.video-modal-player {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-modal-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10;
    opacity: 0;
    transition: opacity var(--animation-speed-normal) ease;
}

.video-modal-container:hover .video-modal-controls {
    opacity: 1;
}

.video-modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 44px;
    height: 44px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal), transform var(--animation-speed-normal);
    z-index: var(--z-index-tooltip);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

@supports (backdrop-filter: blur(5px)) {
    .video-modal-close {
        backdrop-filter: blur(5px);
    }
}

@media (hover: hover) and (pointer: fine) {
    .video-modal-close:hover {
        background: rgba(0, 0, 0, 0.8);
        transform: rotate(90deg);
    }
}

.video-modal-controls-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.video-modal-control-btn {
    background: none;
    border: none;
    color: white;
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
}

@media (hover: hover) and (pointer: fine) {
    .video-modal-control-btn:hover {
        background: rgba(255, 255, 255, 0.2);
    }
}

.video-modal-time {
    color: white;
    font-size: var(--font-size-lg);
    font-family: monospace;
}

.video-modal-progress {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    margin: 0 var(--spacing-xl);
    position: relative;
    cursor: pointer;
}

.video-modal-progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
    width: 0%;
}

.video-modal-controls-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.video-modal-volume {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.video-modal-volume-slider {
    width: 100px;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    position: relative;
    cursor: pointer;
}

.video-modal-volume-level {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: white;
    border-radius: 3px;
    width: 70%;
}

.video-modal-fullscreen-btn {
    background: none;
    border: none;
    color: white;
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
}

@media (hover: hover) and (pointer: fine) {
    .video-modal-fullscreen-btn:hover {
        background: rgba(255, 255, 255, 0.2);
    }
}

/* ===== 页脚样式 ===== */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: var(--spacing-4xl) var(--spacing-lg) 22px;
    position: relative;
    z-index: 50;
    margin-top: auto;
    transition: background-color var(--animation-speed-normal) ease;
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xl);
}

.footer-section {
    margin-bottom: var(--spacing-lg);
}

.footer-section.center-content {
    text-align: center;
}

.footer-section.center-content .footer-links {
    justify-content: center;
    text-align: left;
    display: inline-block;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bolder);
    color: white;
}

.footer-logo i {
    margin-right: var(--spacing-sm);
    color: #6595ff;
}

.footer-description {
    font-size: var(--font-size-md);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    max-width: 100%;
}

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

.social-link {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--animation-speed-normal), transform var(--animation-speed-normal), border-color var(--animation-speed-normal);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@media (hover: hover) and (pointer: fine) {
    .social-link:hover {
        background: var(--color-primary);
        transform: translateY(-2px);
        border-color: var(--color-primary);
    }
}

.footer-title {
    color: white;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: 15px;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 28px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.footer-section.center-content .footer-title::after {
    left: 50%;
    transform: translateX(-50%);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: var(--color-footer-text);
    font-size: 13px;
    transition: color var(--animation-speed-fast), transform var(--animation-speed-fast);
    display: flex;
    align-items: center;
}

.footer-links a:hover {
    color: white;
    transform: translateX(4px);
}

.footer-section.center-content .footer-links a:hover {
    transform: none;
}

.footer-links a i {
    margin-right: var(--spacing-xs);
    font-size: 11px;
    color: #b7c6e7;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 13px;
    color: var(--color-footer-text);
}

.contact-item i {
    width: 16px;
    text-align: center;
    color: #b7c6e7;
    margin-top: 2px;
    font-size: 13px;
}

.contact-item a {
    color: var(--color-footer-text);
    transition: color var(--animation-speed-normal);
}

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

.footer-contact-form p {
    margin-bottom: var(--spacing-md);
    font-size: 13px;
    line-height: 1.5;
}

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

.contact-input, 
.contact-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: var(--font-size-sm);
    outline: none;
    transition: border-color var(--animation-speed-normal), background-color var(--animation-speed-normal);
}

.contact-textarea {
    min-height: 70px;
    resize: vertical;
}

.contact-input:focus, 
.contact-textarea:focus {
    border-color: var(--color-primary);
    background: rgba(255, 255, 255, 0.15);
}

.contact-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal);
    width: 100%;
    font-size: 13px;
}

.contact-btn:hover {
    background: var(--color-secondary);
}

.footer-bottom {
    max-width: 1400px;
    margin: 3px auto 0;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.copyright {
    font-size: 13px;
    color: var(--color-footer-text);
}

.footer-nav {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--color-footer-text);
    font-size: var(--font-size-sm);
    transition: color var(--animation-speed-fast);
    position: relative;
}

.footer-nav a:hover {
    color: white;
}

.footer-nav a.about-us {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.footer-nav a.about-us:hover {
    color: white;
}

.footer-nav a.about-us::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -3px;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
}

/* ===== 返回顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: 70px;
    right: var(--spacing-lg);
    width: 44px;
    height: 44px;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--animation-speed-normal) ease, visibility var(--animation-speed-normal) ease, background-color var(--animation-speed-normal) ease, transform var(--animation-speed-normal) ease;
    z-index: 99;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

@media (hover: hover) and (pointer: fine) {
    .back-to-top:hover {
        background-color: var(--color-secondary);
        transform: translateY(-2px);
    }
}

.back-to-top i {
    font-size: var(--font-size-xl);
}

@media (max-width: 768px) {
    :root {
        --layout-header-height: 33px;
    }
    body {
        font-size: 15px;
        line-height: 1.5;
        padding-top: var(--layout-header-height);
    }
    
    .header {
        padding: 0 var(--spacing-md);
        height: 58px;
    }
    
    .desktop-search,
    .nav-links,
    .language-btn .language-text {
        display: none !important;
    }
    
    .header-left {
        flex: 0 0 auto;
        order: 1;
        min-width: 0;
        gap: var(--spacing-sm);
    }
    
    .menu-toggle {
        width: 28px;
        height: 28px;
        margin-right: 0;
    }
    
    .logo-container {
        height: 32px;
        min-width: 0;
    }
    
    .logo {
        height: 32px;
    }
    
    .logo-img {
        max-width: 120px;
    }
    
    .city-selector {
        display: block !important;
    }
    
    .city-selector-btn {
        padding: 2px 6px;
        font-size: var(--font-size-sm);
    }
    
    .city-selector-btn i {
        font-size: 8px;
    }
    
    .main-nav-container {
        display: none;
    }
    
    .main-nav {
        display: none;
    }
    
    .header-right {
        flex: 0 0 auto;
        order: 3;
        justify-content: flex-end;
        gap: var(--spacing-xs);
        margin-left: 0;
        flex: 1;
        max-width: 200px;
    }
    
    .search-container {
        flex: 1;
        max-width: 180px;
        margin-right: 0;
    }
    
    .desktop-search {
        display: flex !important;
        width: 100%;
    }
    
    .mobile-search-trigger {
        display: none !important;
    }
    
    .footer {
        padding: var(--spacing-3xl) var(--spacing-lg) 72px;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 70px;
        right: var(--spacing-md);
        width: 40px;
        height: 40px;
    }
    
    .back-to-top i {
        font-size: var(--font-size-lg);
    }
    
    .sidebar {
        top: var(--layout-header-height);
    }
    
    .main-content {
        padding-top: var(--spacing-md);
    }
    
    .main-nav {
        display: none !important;
    }
    
    .mega-dropdown {
        display: none !important;
    }
    
    .city-dropdown {
        width: 280px;
        left: 50%;
        transform: translateX(-50%);
        max-height: 400px;
        overflow-y: auto;
    }
    
    .mobile-tabbar {
        padding: var(--spacing-xs) 0;
        height: 58px;
    }
    
    .tab-item i {
        width: 32px;
        height: 32px;
        font-size: var(--font-size-xl);
    }
    
    .tab-item.active i {
        background: rgba(26, 86, 219, 0.08);
    }
    
    .tab-item.active::after {
        width: 20px;
        height: 2px;
        top: -1px;
    }
    
    .video-modal-container {
        width: 100%;
        border-radius: 0;
        max-height: 100vh;
        max-width: 100%;
    }
    
    .video-modal-overlay {
        padding: 0;
    }
    
    .video-modal-close {
        top: 10px;
        right: 10px;
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .city-selector {
        margin-left: 2px;
    }
    
    .city-selector-btn {
        font-size: 11px;
        padding: 1px 4px;
    }
    
    .city-selector-btn i {
        font-size: 7px;
    }
    
    .search-container {
        max-width: 150px;
    }
    
    .search-input {
        min-width: 80px;
        font-size: 12px;
        padding: 0 8px;
    }
    
    .search-btn {
        width: 32px;
        height: 32px;
        font-size: 12px;
    }
}

@media (min-width: 769px) {
    .header-left {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        flex-shrink: 0;
    }
    
    .menu-toggle {
        width: 32px;
        height: 32px;
        border-radius: var(--radius-md);
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
    }
    
    @media (hover: hover) and (pointer: fine) {
        .menu-toggle:hover {
            background: rgba(0, 0, 0, 0.05);
        }
    }
    
    .logo-container {
        min-width: 140px;
        height: 40px;
    }
    
    .logo {
        height: 50px;
    }
    
    .logo-img {
        max-width: 140px;
    }
    
    .city-selector {
        display: block !important;
        margin-left: var(--spacing-md);
    }
    
    .main-nav {
        display: flex;
        align-items: center;
        justify-content: center;
        height: 100%;
        width: 100%;
        max-width: var(--layout-nav-max);
    }
    
    .nav-links {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 25px;
        height: 100%;
        width: 100%;
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 14.5px;
        white-space: nowrap;
    }
    
    .header-right {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        flex-shrink: 0;
        justify-content: flex-end;
        margin-right: 238px;
    }
    
    .mobile-search-trigger,
    .mobile-search-overlay {
        display: none;
    }
    
    .search-container {
        position: relative;
        width: 250px;
        margin: 0;
    }
    
    .nav-links {
        display: flex;
        gap: var(--spacing-xs);
    }
    
    .mobile-tabbar {
        display: none;
    }
    
    .back-to-top {
        bottom: var(--spacing-2xl);
        right: var(--spacing-2xl);
    }
    
    .top-bar {
        transition: transform 0.4s var(--animation-easing);
    }
    
    .header {
        transition: top 0.4s var(--animation-easing), transform 0.4s var(--animation-easing);
    }
}

/* 友情链接模块样式 */
.footer-links-section {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-links-container {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    width: 100%;
}

.footer-links-label {
    font-size: 13px;
    color: var(--color-footer-text);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
}

.footer-link {
    color: var(--color-footer-text);
    font-size: 13px;
    text-decoration: none;
    transition: color var(--animation-speed-fast);
    white-space: nowrap;
    position: relative;
    padding: var(--spacing-xs) 0;
}

.footer-link:hover {
    color: white;
}

.footer-link::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background-color: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--animation-speed-normal) ease;
}

.footer-link:hover::after {
    transform: scaleX(1);
}

@media (max-width: 768px) {
    .footer-links-section {
        margin-bottom: var(--spacing-lg);
        padding-top: var(--spacing-lg);
    }
    
    .footer-links-container {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-md);
        overflow-x: auto;
        padding-bottom: var(--spacing-xs);
        scrollbar-width: thin;
        scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
    }
    
    .footer-links-container::-webkit-scrollbar {
        height: 4px;
    }
    
    .footer-links-container::-webkit-scrollbar-track {
        background: transparent;
    }
    
    .footer-links-container::-webkit-scrollbar-thumb {
        background-color: rgba(255, 255, 255, 0.3);
        border-radius: 2px;
    }
    
    .footer-links-container::-webkit-scrollbar-thumb:hover {
        background-color: rgba(255, 255, 255, 0.5);
    }
    
    .footer-links-label {
        margin-bottom: 0;
        margin-right: var(--spacing-sm);
        flex-shrink: 0;
    }
    
    .footer-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        display: inline-block;
        width: auto;
        flex-shrink: 0;
    }
    
    .footer-link:last-child {
        margin-right: 0;
    }
}

@media (max-width: 480px) {
    .footer-links-section {
        padding: 0 var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    
    .footer-links-container {
        gap: var(--spacing-sm);
        padding-bottom: var(--spacing-xs);
    }
    
    .footer-links-label {
        font-size: 12px;
        margin-right: var(--spacing-xs);
    }
    
    .footer-link {
        font-size: 12px;
        padding: var(--spacing-xs) var(--spacing-xs);
    }
}

@media (max-width: 360px) {
    .footer-links-container {
        gap: 8px;
    }
    
    .footer-links-label {
        font-size: 11px;
        margin-right: 6px;
    }
    
    .footer-link {
        font-size: 11px;
        padding: 2px 6px;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .footer-links-section {
        padding: 0 var(--spacing-lg);
    }
    
    .footer-links-container {
        gap: var(--spacing-md);
    }
    
    .footer-links-label {
        font-size: 13px;
        margin-right: var(--spacing-md);
    }
    
    .footer-link {
        font-size: 13px;
        padding: var(--spacing-xs) var(--spacing-md);
    }
}

@media (min-width: 769px) {
    body.sidebar-collapsed .sidebar-item span,
    body.sidebar-collapsed .category-header span,
    body.sidebar-collapsed .category-header .category-toggle,
    body.sidebar-collapsed .category-header .category-link,
    body.sidebar-collapsed .subcategories,
    body.sidebar-collapsed .sidebar-section {
        opacity: 0;
        transition: opacity 0.15s ease 0.1s;
    }
    
    body:not(.sidebar-collapsed) .sidebar-item span,
    body:not(.sidebar-collapsed) .category-header span,
    body:not(.sidebar-collapsed) .category-header .category-toggle,
    body:not(.sidebar-collapsed) .category-header .category-link,
    body:not(.sidebar-collapsed) .subcategories,
    body:not(.sidebar-collapsed) .sidebar-section {
        opacity: 1;
        transition: opacity 0.15s ease;
    }
    
    .main-content-wrapper {
        transition: margin-left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                   width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    .sidebar {
        transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    .main-content {
        transition: none;
    }
}