/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量定义 */
:root {
    /* 主色调 */
    --primary-color: #6200EA;
    --primary-dark: #3700B3;
    --primary-light: #8E24AA;
    
    /* 辅助色 */
    --secondary-color: #03DAC6;
    --accent-color: #FFC107;
    
    /* 中性色 */
    --white: #FFFFFF;
    --gray-light: #F5F5F5;
    --gray: #E0E0E0;
    --gray-dark: #757575;
    --black: #212121;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-color) 0%, #00BFA5 100%);
    --gradient-dark: linear-gradient(135deg, var(--black) 0%, #424242 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.14);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.16);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 50%;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 字体 */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
}

/* 基础样式 */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--black);
    background-color: var(--gray-light);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::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 var(--transition-slow);
    z-index: -1;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-download {
    background: var(--gradient-secondary);
    color: var(--white);
    padding: 10px 24px;
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-md);
}

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

/* 头部导航 */
.header {
    /* 基础背景色，确保在所有设备上都可见 */
    background-color: #ffffff;
    /* 半透明背景和模糊效果，增强视觉体验 */
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    /* 确保在WebKit内核浏览器上也能正常工作 */
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
    /* 防止背景闪烁 */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    /* 确保导航始终在最上层 */
    overflow: visible;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

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

.logo-img {
    width: 48px;
    height: 48px;
    margin-right: 12px;
    transition: transform var(--transition-normal);
}

.logo:hover .logo-img {
    transform: scale(1.1);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 桌面导航 */
.desktop-nav {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
}

.nav-item {
    margin-left: 32px;
}

.nav-link {
    color: var(--gray-dark);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
    padding: 8px 0;
}

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

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

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

/* 移动端导航按钮 */
.mobile-nav-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.nav-icon {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--primary-color);
    border-radius: 10px;
    transition: all var(--transition-normal);
}

.mobile-nav-btn.active .nav-icon:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-nav-btn.active .nav-icon:nth-child(2) {
    opacity: 0;
}

.mobile-nav-btn.active .nav-icon:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 移动端导航菜单 */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 999;
    padding-top: 100px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    margin: 0;
    padding: 0;
    padding-top: 100px;
    overflow: hidden;
}

.mobile-nav.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav .nav-list {
    flex-direction: column;
    align-items: center;
}

.mobile-nav .nav-item {
    margin: 0 0 24px 0;
}

.mobile-nav .nav-link {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--black);
}

/* 英雄区域 */
.hero {
    background: var(--gradient-dark);
    color: var(--white);
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(98, 0, 234, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(3, 218, 198, 0.3) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: 40px;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

/* 下载区域 */
.download-section {
    padding: 80px 0;
    background-color: var(--white);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--black);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    margin-bottom: 64px;
    color: var(--gray-dark);
    font-weight: 400;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.download-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transition: left var(--transition-normal);
}

.download-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.download-card:hover::before {
    left: 0;
}

.platform-icon {
    margin-bottom: 24px;
    transition: transform var(--transition-normal);
}

.download-card:hover .platform-icon {
    transform: scale(1.1) rotate(5deg);
}

.platform-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--black);
}

.version-info {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 8px;
}

.system-requirement {
    font-size: var(--font-size-sm);
    color: var(--gray-dark);
    margin-bottom: 24px;
}

/* 功能介绍区域 */
.features-section {
    padding: 80px 0;
    background-color: var(--gray-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.feature-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: -50%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: all var(--transition-slow);
    z-index: -1;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-card:hover::after {
    right: 0;
    opacity: 0.05;
}

.feature-icon {
    margin-bottom: 24px;
    transition: transform var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--black);
    transition: color var(--transition-normal);
}

.feature-card:hover .feature-title {
    color: var(--primary-color);
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--gray-dark);
    line-height: 1.6;
}

/* 支持平台区域 */
.platforms-section {
    padding: 80px 0;
    background-color: var(--white);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 40px;
    margin-top: 40px;
    justify-items: center;
}

.platform-item {
    text-align: center;
    transition: all var(--transition-normal);
}

.platform-item:hover {
    transform: translateY(-8px);
}

.platform-logo {
    margin-bottom: 16px;
    transition: transform var(--transition-normal);
}

.platform-item:hover .platform-logo {
    transform: scale(1.1) rotate(5deg);
}

.platform-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--black);
}

/* 关于我们 */
.about-section {
    padding: 80px 0;
    background: var(--gradient-dark);
    color: var(--white);
}

.about-section .section-title {
    color: var(--white);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    font-size: var(--font-size-lg);
    margin-bottom: 24px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

/* 联系我们 */
.contact-section {
    padding: 80px 0;
    background-color: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 40px;
}

.contact-info h3,
.friend-links h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--black);
}

.contact-info p {
    margin-bottom: 12px;
    font-size: var(--font-size-base);
    color: var(--gray-dark);
}

.contact-info a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-info a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.links-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.links-list li a {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--gray-light);
    color: var(--gray-dark);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.links-list li a:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 页脚 */
.footer {
    background-color: var(--black);
    color: var(--white);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo-img {
    width: 48px;
    height: 48px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: var(--font-size-sm);
}

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

.copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-top: 16px;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* 动画 */
@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(20px, 20px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 响应式设计 */
@media (max-width: 992px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
        --font-size-xl: 1.25rem;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-buttons {
        gap: 16px;
    }
    
    .btn {
        padding: 10px 24px;
    }
}

@media (max-width: 768px) {
    /* 移动端导航 */
    .desktop-nav {
        display: none;
    }
    
    .mobile-nav-btn {
        display: flex;
    }
    
    .mobile-nav {
        display: block;
    }
    
    /* 英雄区域 */
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: 32px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
    
    /* 通用区域 */
    .download-section,
    .features-section,
    .platforms-section,
    .about-section,
    .contact-section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: 40px;
    }
    
    /* 下载区域 */
    .download-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    /* 功能介绍 */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    /* 联系我们 */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    /* 页脚 */
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    /* 回到顶部按钮 */
    .back-to-top {
        bottom: 24px;
        right: 24px;
        width: 48px;
        height: 48px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .logo-text {
        font-size: var(--font-size-lg);
    }
    
    .logo-img {
        width: 40px;
        height: 40px;
        margin-right: 8px;
    }
    
    .download-card,
    .feature-card {
        padding: 32px 24px;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background-color: var(--gray-light);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* 选择文本样式 */
::selection {
    background-color: rgba(98, 0, 234, 0.3);
    color: var(--black);
}

::-moz-selection {
    background-color: rgba(98, 0, 234, 0.3);
    color: var(--black);
}

/* 动画效果类 */
.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}