:root {
    /* 全新配色方案 - 使用紫蓝色调 */
    --primary: #5C6BC0;
    --primary-dark: #3949AB;
    --primary-light: #7986CB;
    --secondary: #FF9800;
    --secondary-dark: #F57C00;
    --secondary-light: #FFB74D;
    --dark: #1A1A2E;
    --dark-light: #2D2D42;
    --grey: #6C757D;
    --grey-light: #CED4DA;
    --white: #FFFFFF;
    --bg-light: #F8F9FA;
    --gradient: linear-gradient(135deg, #5C6BC0 0%, #7986CB 100%);
    
    /* 阴影 */
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 16px;
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--bg-light);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img, svg {
    max-width: 100%;
    height: auto;
}

/* 布局容器 */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* 顶部导航栏 */
header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--primary-dark);
}

.logo-icon {
    margin-right: var(--space-xs);
}

.main-nav {
    height: 100%;
}

.nav-list {
    display: flex;
    gap: var(--space-md);
    height: 100%;
    align-items: center;
}

.nav-list a {
    color: var(--dark);
    font-weight: 500;
    transition: all 0.3s;
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
}

.nav-list a:hover {
    color: var(--primary);
    background-color: rgba(92, 107, 192, 0.1);
}

.lang-switch a {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--primary);
}

.lang-switch a::before {
    content: '';
    display: inline-block;
    width: 18px;
    height: 18px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%235C6BC0'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-1 17.93c-3.95-.49-7-3.85-7-7.93 0-.62.08-1.21.21-1.79L9 15v1c0 1.1.9 2 2 2v1.93zm6.9-2.54c-.26-.81-1-1.39-1.9-1.39h-1v-3c0-.55-.45-1-1-1H8v-2h2c.55 0 1-.45 1-1V7h2c1.1 0 2-.9 2-2v-.41c2.93 1.19 5 4.06 5 7.41 0 2.08-.8 3.97-2.1 5.39z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 24px;
    position: relative;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--primary);
    position: absolute;
    border-radius: 3px;
    transition: all 0.3s;
}

.menu-toggle span:nth-child(1) {
    top: 0;
}

.menu-toggle span:nth-child(2) {
    top: 10px;
}

.menu-toggle span:nth-child(3) {
    top: 20px;
}

/* 横幅区域 */
.banner {
    padding: var(--space-xl) 0;
    background: var(--gradient);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.banner::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cpath fill='%23ffffff' fill-opacity='0.05' d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z'%3E%3C/path%3E%3C/svg%3E");
    z-index: 0;
}

.banner .container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.banner-content {
    flex: 1;
}

.banner h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: var(--space-md);
    opacity: 0.9;
}

.banner-buttons {
    display: flex;
    gap: var(--space-sm);
}

.banner-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--secondary);
    color: var(--white);
    box-shadow: 0 4px 10px rgba(255, 152, 0, 0.3);
}

.btn-primary:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 152, 0, 0.4);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
    backdrop-filter: blur(5px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* 特点区域 */
.features-section {
    padding: var(--space-xl) 0;
    background-color: var(--white);
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.feature-card {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: var(--space-md);
    box-shadow: var(--shadow);
    border-top: 4px solid var(--primary);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(92, 107, 192, 0.1);
}

.feature-card h3 {
    margin-bottom: var(--space-xs);
    color: var(--primary-dark);
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--grey);
}

/* 优势区域 */
.advantage-section {
    padding: var(--space-xl) 0;
    background-color: var(--dark);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.advantage-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(92,107,192,0.2) 0%, rgba(26,26,46,0) 70%);
    border-radius: 50%;
}

.advantage-section .section-title {
    color: var(--white);
    position: relative;
}

.advantage-section .section-description {
    color: var(--grey-light);
}

.advantage-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.advantage-item {
    flex: 1 1 45%;
    min-width: 280px;
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--dark-light);
    border-radius: var(--radius);
    border-left: 4px solid var(--secondary);
    transition: all 0.3s;
}

.advantage-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.advantage-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary);
    line-height: 1;
}

.advantage-content h3 {
    margin-bottom: var(--space-xs);
    color: var(--secondary-light);
}

.advantage-content p {
    color: var(--grey-light);
}

.stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    background-color: var(--dark-light);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

.stat-item {
    text-align: center;
    padding: var(--space-sm);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-xs);
    position: relative;
    display: inline-block;
}

.stat-number::after {
    content: '+';
    position: absolute;
    top: 0;
    right: -15px;
    font-size: 1.5rem;
    color: var(--secondary-light);
}

.stat-text {
    color: var(--grey-light);
}

/* 下载区域 */
.download-section {
    padding: var(--space-xl) 0;
    background-color: var(--bg-light);
    position: relative;
}

.download-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: var(--gradient);
}

.download-options {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-top: var(--space-lg);
    align-items: stretch;
}

.download-app {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: var(--space-md);
    box-shadow: var(--shadow);
    flex: 1;
    max-width: 600px;
    display: flex;
    gap: var(--space-md);
    position: relative;
}

.download-app::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--gradient);
    border-radius: var(--radius) var(--radius) 0 0;
}

.app-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-info {
    flex: 1;
}

.app-info h3 {
    color: var(--primary-dark);
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.app-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: var(--space-md);
}

.app-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--grey);
    font-size: 0.9rem;
}

.app-buttons {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.download-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: all 0.3s;
}

.download-button.android {
    background-color: var(--primary);
    color: var(--white);
}

.download-button.ios {
    background-color: var(--secondary);
    color: var(--white);
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.qrcode-container {
    background-color: var(--white);
    padding: var(--space-md);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    max-width: 200px;
}

.qrcode-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--secondary);
    border-radius: var(--radius) var(--radius) 0 0;
}

.qrcode {
    margin-bottom: var(--space-xs);
}

.qrcode-tip {
    color: var(--grey);
    font-size: 0.9rem;
    text-align: center;
}

/* 关于我们区域 */
.about-section {
    padding: var(--space-xl) 0;
    background-color: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.about-image {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-light);
    border-radius: var(--radius);
    padding: var(--space-md);
    box-shadow: var(--shadow);
}

.about-content {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.about-info h3 {
    color: var(--primary-dark);
    margin-bottom: var(--space-xs);
    font-size: 1.3rem;
}

.about-info p {
    margin-bottom: var(--space-md);
    color: var(--grey);
    line-height: 1.6;
}

.about-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--grey-light);
}

.stat-box {
    flex: 1 1 30%;
    min-width: 120px;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--grey);
}

/* 页脚 */
footer {
    background-color: var(--dark);
    color: var(--white);
    padding-top: var(--space-lg);
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: var(--space-md);
    color: var(--white);
}

.footer-logo svg {
    margin-right: 10px;
}

.footer-nav {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-md);
}

.footer-col h4 {
    color: var(--primary-light);
    margin-bottom: var(--space-sm);
    font-size: 1rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col a {
    color: var(--grey-light);
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--primary-light);
}

.footer-middle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--dark-light);
    color: var(--white);
    transition: all 0.3s;
}

.social-link:hover {
    background-color: var(--primary);
    transform: translateY(-3px);
}

.qr-favicon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.favicon-footer {
    width: 64px;
    height: 64px;
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}

.copyright {
    color: var(--grey-light);
}

.legal-links {
    display: flex;
    gap: var(--space-sm);
}

.legal-links a {
    color: var(--grey-light);
    transition: color 0.3s;
}

.legal-links a:hover {
    color: var(--primary-light);
}

/* 全局标题和描述样式 */
.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: var(--space-sm);
    color: var(--primary-dark);
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient);
    border-radius: 3px;
}

.section-description {
    text-align: center;
    font-size: 1.2rem;
    color: var(--grey);
    max-width: 700px;
    margin: 0 auto var(--space-lg);
}

/* 响应式设计 */
@media (max-width: 992px) {
    :root {
        --space-lg: 3rem;
        --space-xl: 4rem;
    }
    
    .banner .container {
        flex-direction: column;
    }
    
    .banner-content {
        text-align: center;
    }
    
    .banner-buttons {
        justify-content: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .about-image {
        order: 2;
    }
    
    .about-content {
        order: 1;
    }
    
    .download-options {
        flex-direction: column;
        align-items: center;
    }
    
    .download-app {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 2.5rem;
        --space-xl: 3rem;
    }
    
    .nav-list {
        display: none;
        flex-direction: column;
        gap: var(--space-sm);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        padding: var(--space-md) 0;
        box-shadow: var(--shadow);
    }
    
    .main-nav.active .nav-list {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 9px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -9px);
    }
    
    .banner h1 {
        font-size: 2.5rem;
    }
    
    .advantage-item {
        flex: 1 1 100%;
    }
    
    .footer-top {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .footer-nav {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-middle {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .legal-links {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .app-features {
        grid-template-columns: 1fr;
    }
    
    .download-app {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .app-buttons {
        justify-content: center;
    }
    
    .about-stats {
        justify-content: center;
    }
    
    .stat-box {
        flex: 0 0 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 2.5rem;
    }
    
    .banner h1 {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-description {
        font-size: 1rem;
    }
    
    .banner-buttons {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .app-buttons {
        flex-direction: column;
    }
    
    .footer-nav {
        grid-template-columns: 1fr;
    }
    
    .social-links {
        justify-content: center;
    }
}