/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", Arial, sans-serif;
}

/* 颜色变量定义 */
:root {
    --black-primary: #121212;      /* 神秘黑 */
    --black-secondary: #1e1e1e;    /* 深黑 */
    --blue-primary: #1677ff;       /* 湖水蓝 */
    --blue-hover: #4096ff;         /* 湖水蓝 hover */
    --white-primary: #ffffff;      /* 白色 */
    --gray-primary: #999999;       /* 浅灰色 */
    --gray-secondary: #666666;     /* 中灰色 */
}

/* 页面基础样式 */
body {
    background-color: var(--black-primary);
    color: var(--white-primary);
    line-height: 1.6;
}

/* 头部导航 */
header {
    background-color: var(--black-secondary);
    padding: 15px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--blue-primary);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.logo-text {
    font-size: 20px;
    font-weight: bold;
    color: var(--blue-primary);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav a {
    color: var(--white-primary);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--blue-primary);
}

/* 主要内容区 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 50px 20px;
}

/* 首页英雄区 */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 80px;
    gap: 50px;
}

.hero-text {
    flex: 1;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--blue-primary);
}

.hero p {
    font-size: 18px;
    color: var(--gray-primary);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 0 30px rgba(22, 119, 255, 0.2);
}

/* 下载按钮样式 */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: var(--blue-primary);
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.download-btn:hover {
    background-color: var(--blue-hover);
}

.download-btn i {
    font-size: 20px;
}

/* 产品介绍区域 */
.product-intro {
    margin-bottom: 80px;
}

.section-title {
    font-size: 32px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--blue-primary);
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 80px;
    height: 3px;
    background-color: var(--blue-primary);
    margin: 15px auto 0;
}

.intro-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.intro-card {
    background-color: var(--black-secondary);
    padding: 30px;
    border-radius: 10px;
    border-left: 4px solid var(--blue-primary);
    transition: transform 0.3s;
}

.intro-card:hover {
    transform: translateY(-5px);
}

.intro-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--blue-primary);
}

.intro-card p {
    color: var(--gray-primary);
    font-size: 16px;
    line-height: 1.7;
}

/* 下载页面样式 */
.download-page {
    text-align: center;
}

.download-page .product-img {
    max-width: 600px;
    margin: 0 auto 50px;
}

.download-page .product-img img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 0 30px rgba(22, 119, 255, 0.2);
}

.download-options {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 50px 0;
    flex-wrap: wrap;
}

.download-option {
    background-color: var(--black-secondary);
    padding: 30px;
    border-radius: 10px;
    width: 250px;
    text-align: center;
}

.download-option i {
    font-size: 40px;
    color: var(--blue-primary);
    margin-bottom: 20px;
}

.download-option h3 {
    margin-bottom: 15px;
    font-size: 18px;
}

/* 版本更新区域 */
.version-update {
    background-color: var(--black-secondary);
    padding: 40px;
    border-radius: 10px;
    margin-bottom: 50px;
}

.update-list {
    list-style: none;
}

.update-item {
    padding: 15px 0;
    border-bottom: 1px solid #333;
    display: flex;
    justify-content: space-between;
}

.update-item:last-child {
    border-bottom: none;
}

.update-version {
    color: var(--blue-primary);
    font-weight: bold;
}

.update-date {
    color: var(--gray-primary);
}

/* 短文章区域 */
.short-articles {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}

.article-card {
    background-color: var(--black-secondary);
    padding: 20px;
    border-radius: 8px;
}

.article-card h4 {
    color: var(--blue-primary);
    margin-bottom: 10px;
    font-size: 16px;
}

.article-card p {
    color: var(--gray-primary);
    font-size: 14px;
}

/* 404页面样式 */
.error-page {
    text-align: center;
    padding: 100px 20px;
}

.error-page h1 {
    font-size: 120px;
    color: var(--blue-primary);
    margin-bottom: 30px;
}

.error-page h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.error-page p {
    font-size: 18px;
    color: var(--gray-primary);
    margin-bottom: 40px;
}

/* 页脚样式 */
footer {
    background-color: var(--black-secondary);
    padding: 30px 50px;
    text-align: center;
    border-top: 1px solid var(--blue-primary);
    margin-top: 50px;
}

.footer-text {
    color: var(--gray-primary);
    font-size: 14px;
}

/* 响应式适配 */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .intro-cards {
        grid-template-columns: 1fr;
    }
    
    .short-articles {
        grid-template-columns: 1fr;
    }
    
    header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        gap: 15px;
    }
}