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

body {
    background: #0c0c14;
    color: #fff;
    line-height: 1.8
}

img {
    max-width: 100%;
    display: block;
    border-radius: 8px
}

.header {
    background: #121222;
    padding: 20px;
    text-align: center;
    border-bottom: 2px solid #00a3ff
}

.header h1 {
    font-size: 34px;
    color: #00a3ff
}

.nav {
    background: #090912;
    padding: 15px 0;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 99
}

.nav a {
    color: #fff;
    margin: 0 22px;
    text-decoration: none;
    font-size: 17px;
    font-weight: bold
}

.nav a:hover {
    color: #00a3ff
}

.banner {
    background: linear-gradient(to right, #080810, #141428);
    padding: 80px 20px;
    text-align: center
}

.banner h2 {
    font-size: 46px;
    margin-bottom: 20px
}

.banner h2 span {
    color: #00a3ff
}

.banner p {
    max-width: 900px;
    margin: 0 auto 35px;
    font-size: 20px;
    color: #eee
}

.btn {
    display: inline-block;
    background: #00a3ff;
    color: #000;
    padding: 16px 40px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
    transition: 0.3s
}

.btn:hover {
    background: #0088dd
}

.main {
    max-width: 1200px;
    margin: 60px auto;
    padding: 0 20px
}

.title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px
}

.title span {
    color: #00a3ff
}

/* 功能模块（已去掉图标，纯文字卡片） */
.func {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 70px
}

.func .item {
    background: #16162a;
    padding: 35px;
    border-radius: 12px;
    text-align: center;
    transition: 0.3s;
    height: 100%
}

.func .item:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 20px #00a3ff33
}

.func .item h3 {
    color: #00a3ff;
    font-size: 22px;
    margin-bottom: 15px
}

.func .item p {
    color: #ccc;
    font-size: 16px;
    line-height: 1.7
}

/* 使用教程模块 新增 */
.guide {
    background: #10101d;
    padding: 70px 20px;
    margin-bottom: 70px
}

.guide .box {
    max-width: 1000px;
    margin: 0 auto
}

.step {
    background: #18182e;
    padding: 25px 30px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center
}

.step .num {
    width: 50px;
    height: 50px;
    background: #00a3ff;
    color: #000;
    font-size: 22px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-right: 20px;
    flex-shrink: 0
}

.step .txt h4 {
    color: #00a3ff;
    font-size: 20px;
    margin-bottom: 8px
}

.step .txt p {
    color: #ccc;
    font-size: 16px
}

.show {
    background: #10101d;
    padding: 70px 20px;
    margin-bottom: 70px
}

.show .box {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center
}

.show .text h3 {
    font-size: 28px;
    margin-bottom: 20px
}

.show .text p {
    font-size: 18px;
    color: #ccc
}

.show img {
    border-radius: 12px;
    box-shadow: 0 0 30px #00a3ff22
}

.advantage {
    background: #0c0c18;
    padding: 70px 20px;
    margin-bottom: 70px
}

.advantage .list {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px
}

.advantage .list div {
    background: #18182e;
    padding: 25px;
    border-radius: 10px;
    font-size: 17px
}

.down {
    background: #14142b;
    padding: 70px 30px;
    border-radius: 15px;
    text-align: center;
    margin-bottom: 70px
}

.down p {
    font-size: 18px;
    margin-bottom: 30px;
    color: #eee
}

.footer {
    background: #090913;
    padding: 40px;
    text-align: center;
    color: #777
}