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

:root {
    --main: #2F80ED;
    --bg: #f7f9fc;
    --text: #333;
}

body {
    color: var(--text);
    background: #fff;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 导航 */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 999;
}
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--main);
    display: flex;
    align-items: center;
    gap: 8px;
}
.menu {
    display: flex;
    gap: 30px;
    align-items: center;
}
.menu a {
    text-decoration: none;
    color: #333;
    font-size: 15px;
}
.menu a:hover {
    color: var(--main);
}

/* 按钮样式 */
.nav-btn {
    padding: 8px 18px;
    border-radius: 25px;
    font-size: 14px;
    text-decoration: none;
    font-weight: 500;
}
.nav-btn.login {
    color: var(--main);
    background: #fff;
    transition: all .3s;
    border: 1px solid var(--main);
}

.nav-btn.register:hover {
    color: var(--main);
    background: #fff;
    transition: all .3s;
    border: 1px solid var(--main);
}

.nav-btn.login:hover {
    background: var(--main);
    border: 1px solid var(--main);
    color: #fff;
}

.nav-btn.register {
    background: var(--main);
    border: 1px solid var(--main);
    color: #fff;
    margin-left: 10px;
}

/* 首屏 */
.banner {
    margin-top: 70px;
    padding: 100px 0;
    background: linear-gradient(135deg, #2F80ED 0%, #56CCF2 100%);
    color: white;
    text-align: center;
}
.banner h1 {
    font-size: 42px;
    margin-bottom: 20px;
}
.banner p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.95;
}
.btn {
    padding: 12px 32px;
    background: white;
    color: var(--main);
    border-radius: 50px;
    font-weight: bold;
    text-decoration: none;
    display: inline-block;
}

/* 模块标题 */
.title {
    text-align: center;
    margin: 60px 0 40px;
}
.title h2 {
    font-size: 30px;
    margin-bottom: 10px;
}
.title p {
    color: #666;
    font-size: 16px;
}

/* 核心功能 */
.features {
    padding: 60px 0;
    background: var(--bg);
}
.feature-box {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}
.feature {
    background: white;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}
.feature i {
    font-size: 36px;
    color: var(--main);
    margin-bottom: 15px;
}
.feature h3 {
    margin-bottom: 10px;
}

/* 产品介绍 */
.product {
    padding: 60px 0;
}
.product p {
    max-width: 850px;
    margin: 0 auto;
    font-size: 16px;
    color: #444;
    line-height: 1.8;
    text-align: center;
}

/* 适用场景 */
.scene {
    padding: 60px 0;
    background: var(--bg);
}
.scene-grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
}
.scene-item {
    background: white;
    padding: 18px;
    text-align: center;
    border-radius: 8px;
}

/* 联系我们 */
.contact {
    padding: 60px 0;
    text-align: center;
}
.contact-info {
    font-size: 16px;
    line-height: 2;
}

/* 页脚 */
.footer {
    background: #2a2a2a;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 30px;
}
.footer p {
    margin: 5px 0;
    font-size: 14px;
}
.footer .beian {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 10px;
    font-size: 13px;
    color: #ccc;
}
.footer a {
    color: #ccc;
    text-decoration: none;
}

@media (max-width:768px) {
    .feature-box, .scene-grid {
        grid-template-columns: repeat(1,1fr);
    }
    .menu a {
        display: none;
    }
    .banner h1 {
        font-size: 28px;
    }
}