/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
:root {
    --primary: #415fff;
    --white: #fff;
    --gray: #f5f7fa;
    --dark: #333;
}
body {
    color: var(--dark);
    line-height: 1.6;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
img {
    max-width: 100%;
    height: auto;
}
a {
    text-decoration: none;
    color: inherit;
}
ul {
    list-style: none;
}

/* 导航栏 */
.header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 999;
}
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo img {
    height: 40px;
}
.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}
.nav-menu a {
    font-size: 16px;
    font-weight: 500;
    transition: 0.3s;
}
.nav-menu a.active, .nav-menu a:hover {
    color: var(--primary);
}
.download-btn {
    background: var(--primary);
    color: var(--white) !important;
    padding: 8px 20px;
    border-radius: 4px;
}

/* 横幅 */
.banner {
    padding: 60px 0;
    background: var(--gray);
}
.banner-content {
    display: flex;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}
.banner-text {
    flex: 1;
    min-width: 300px;
}
.banner-text h1 {
    font-size: 42px;
    margin-bottom: 20px;
    color: var(--dark);
}
.banner-text p {
    font-size: 18px;
    margin-bottom: 30px;
    color: #666;
}
.banner-img {
    flex: 1;
    min-width: 300px;
    text-align: center;
}
.main-btn {
    background: var(--primary);
    color: var(--white);
    padding: 12px 30px;
    border-radius: 6px;
    font-size: 18px;
    display: inline-block;
    transition: 0.3s;
}
.main-btn:hover {
    background: #334ed6;
}

/* 模块标题 */
.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 40px;
    position: relative;
}
.section-title::after {
    content: "";
    width: 60px;
    height: 4px;
    background: var(--primary);
    display: block;
    margin: 10px auto 0;
    border-radius: 2px;
}

/* 优势区域 */
.advantages {
    padding: 80px 0;
}
.adv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    text-align: center;
}
.adv-item {
    padding: 30px;
    background: var(--white);
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
    border-radius: 8px;
}
.adv-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary);
}

/* 下载区域 */
.download-section {
    padding: 80px 0;
    background: var(--gray);
}
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    text-align: center;
}
.download-item {
    background: var(--white);
    padding: 40px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}
.download-item h4 {
    font-size: 18px;
    margin-bottom: 20px;
}
.down-btn {
    background: var(--primary);
    color: var(--white);
    padding: 10px 25px;
    border-radius: 4px;
    display: inline-block;
}

/* 内页横幅 */
.page-banner {
    background: var(--primary);
    color: var(--white);
    text-align: center;
    padding: 60px 0;
}
.page-banner h1 {
    font-size: 36px;
    margin-bottom: 15px;
}
.page-banner p {
    font-size: 18px;
    opacity: 0.9;
}

/* 功能详情 */
.features-detail {
    padding: 80px 0;
}
.feature-card {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}
.feature-card.reverse {
    flex-direction: row-reverse;
}
.feature-img, .feature-text {
    flex: 1;
    min-width: 300px;
}
.feature-text h2 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--dark);
}
.feature-text p {
    font-size: 17px;
    color: #666;
}

/* 教程页面 */
.guide-section {
    padding: 80px 0;
}
.guide-step {
    margin-bottom: 50px;
}
.guide-step h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--primary);
}
.guide-step img {
    margin: 20px 0;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}
.guide-tip {
    background: #fff9e6;
    padding: 25px;
    border-radius: 8px;
    margin-top: 40px;
}
.guide-tip h3 {
    color: #ff9800;
    margin-bottom: 15px;
}
.guide-tip li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
}
.guide-tip li::before {
    content: "•";
    color: var(--primary);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* 页脚 */
.footer {
    background: var(--dark);
    color: var(--white);
    text-align: center;
    padding: 30px 0;
    margin-top: 40px;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-menu {
        gap: 15px;
    }
    .banner-text h1 {
        font-size: 32px;
    }
    .section-title {
        font-size: 28px;
    }
}