body {
    margin: 0;
    font-family: "微软雅黑", "Microsoft YaHei", Arial, sans-serif;
    background: #f5f6fa;
    color: #222;
}
header {
    background: linear-gradient(90deg, #0984e3 0%, #00b894 100%);
    color: #fff;
    padding: 48px 0 36px 0;
    text-align: center;
}
header .subtitle {
    font-size: 1.3em;
    margin: 12px 0 24px 0;
}
.btn-main {
    display: inline-block;
    background: #fdcb6e;
    color: #222;
    font-weight: bold;
    padding: 14px 36px;
    border-radius: 28px;
    text-decoration: none;
    font-size: 1.2em;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: background 0.2s;
}
.btn-main:hover {
    background: #ffeaa7;
}
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 18px;
}
.features, .about, .contact, .download {
    background: #fff;
    margin: 32px 0;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    padding: 32px 0;
}
.features ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.features li {
    font-size: 1.1em;
    margin: 18px 0;
    padding-left: 1.2em;
    position: relative;
}
.features li:before {
    content: "•";
    color: #00b894;
    position: absolute;
    left: 0;
    font-size: 1.2em;
}
.download {
    text-align: center;
}
.btn-download {
    display: inline-block;
    background: #00b894;
    color: #fff;
    font-weight: bold;
    padding: 12px 32px;
    border-radius: 24px;
    text-decoration: none;
    font-size: 1.1em;
    margin-bottom: 18px;
    margin-top: 8px;
    transition: background 0.2s;
}
.btn-download:hover {
    background: #0984e3;
}
.about p {
    font-size: 1.08em;
    line-height: 1.8;
}
.contact ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.contact li {
    margin: 10px 0;
    font-size: 1.05em;
}
footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 18px 0;
    font-size: 0.98em;
    margin-top: 36px;
    border-radius: 0 0 12px 12px;
}
@media (max-width: 600px) {
    .container {
        padding: 0 6px;
    }
    header {
        padding: 32px 0 18px 0;
    }
    .features, .about, .contact, .download {
        padding: 18px 0;
    }
    .btn-main, .btn-download {
        padding: 10px 18px;
        font-size: 1em;
    }
}