/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

/* 基础样式 */
body {
    line-height: 1.6;
    color: #333;
    background: #f5f7fa;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

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

.section-title {
    text-align: center;
    font-size: 28px;
    margin-bottom: 40px;
    color: #222;
    position: relative;
}

.section-title::after {
    content: "";
    width: 80px;
    height: 4px;
    background: #0088cc;
    display: block;
    margin: 10px auto;
    border-radius: 2px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 16px;
    margin: 10px;
    transition: all 0.3s ease;
}

.primary-btn {
    background: #0088cc;
    color: white;
}

.secondary-btn {
    border: 2px solid #0088cc;
    color: #0088cc;
}

.primary-btn:hover, .secondary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,136,204,0.2);
}

/* 导航栏 */
.header {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 999;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

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

.logo img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo h1 {
    font-size: 22px;
    color: #0088cc;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 16px;
    font-weight: 500;
    color: #555;
    transition: color 0.3s;
}

.nav a.active, .nav a:hover {
    color: #0088cc;
}

/* 横幅 */
.banner {
    padding: 60px 0;
    background: linear-gradient(135deg, #e3f2fd 0%, #f5f7fa 100%);
}

.banner-content {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}

.banner-text {
    flex: 1;
    min-width: 300px;
}

.banner-text h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: #222;
}

.banner-text p {
    font-size: 18px;
    color: #666;
    margin-bottom: 30px;
}

.banner-img {
    flex: 1;
    min-width: 300px;
    text-align: center;
}

.banner-img img {
    max-width: 100%;
    height: auto;
}

/* 优势卡片 */
.advantages {
    padding: 80px 0;
    background: white;
}

.advantage-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.card {
    padding: 30px;
    background: #f9fbfc;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s;
}

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

.card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #0088cc;
}

/* 介绍 */
.intro {
    padding: 80px 0;
    text-align: center;
    font-size: 17px;
    color: #555;
    max-width: 900px;
    margin: 0 auto;
}

/* 页脚 */
.footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}

/* 功能页样式 */
.page-header {
    background: #0088cc;
    color: white;
    text-align: center;
    padding: 40px 0;
}

.page-header h2 {
    font-size: 32px;
    margin-bottom: 10px;
}

.features-list {
    padding: 80px 0;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.feature-item.reverse {
    flex-direction: row-reverse;
}

.feature-img, .feature-text {
    flex: 1;
    min-width: 300px;
}

.feature-img img {
    max-width: 100%;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.feature-text h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #0088cc;
}

.extra-features {
    padding: 80px 0;
    background: white;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    text-align: center;
}

.grid-item {
    padding: 15px;
    background: #f5f7fa;
    border-radius: 10px;
    font-weight: 500;
}

/* 下载页样式 */
.download-banner {
    text-align: center;
    padding: 40px 0;
    background: #e3f2fd;
}

.download-banner img {
    max-width: 600px;
    width: 100%;
    margin-bottom: 20px;
}

.download-banner h2 {
    font-size: 32px;
    color: #222;
    margin-bottom: 10px;
}

.download-section {
    padding: 80px 0;
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.download-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

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

.download-card img {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    object-fit: contain;
}

.download-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.download-btn {
    display: inline-block;
    padding: 10px 25px;
    background: #0088cc;
    color: white;
    border-radius: 50px;
    margin-top: 15px;
    transition: background 0.3s;
}

.download-btn:hover {
    background: #006699;
}

.tutorial {
    padding: 80px 0;
    background: white;
}

.tutorial-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 2;
}

.tutorial-content h3 {
    color: #0088cc;
    margin: 20px 0 10px;
}

/* 响应式适配 */
@media (max-width: 768px) {
    .nav {
        gap: 15px;
    }
    .banner-text h2 {
        font-size: 28px;
    }
    .section-title {
        font-size: 24px;
    }
}