{
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Open Sans', 'sans-serif';
}

body{
    height: 100vh;
    background: #000;
    /*background-image: url("https://images.unsplash.com/photo-1485470733090-0aae1788d5af?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1517&q=80");*/
    background-image: url("https://self-searcher.oss-cn-hangzhou.aliyuncs.com/Website/Background.jpg");
    background-size: cover;
    background-position: center;
}

/*蒙版*/
div#overlay{
 background-color:rgba(0, 0, 0, 0.6)
}

li{
    list-style: none;
}

a{
    text-decoration: none;
    color: #ffffff;
    font-size: 1rem;
}

a:hover{
    color: orange;
}

header{
    position: relative;
    padding: 0 2rem;
}

.navbar{
    width: 100%;
    height: 60px;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar .logo a{
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar .links{
    display: flex;
    gap: 2rem;
}

.navbar .toggle_btn{
    color: #ffffff;
    font-size: 1.5rem;
    cursor: pointer;
    display: none;
}

.action_btn{
    background-color: orange;
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    outline: none;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    cursor: pointer;
}

.action_btn:hover{
    scale: 1.05;
    color: white;
}


.action_btn:active{
    scale: 0.95;
}

/**Dropdown Menu*/
.dropdown_menu{
    display: none;
    position: absolute;
    right: 2rem;
    top: 60px;
    width: 300px;
    height: 0;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(15px);
    border-radius: 10px;
    overflow: hidden;
    transition: height 0.2s cubic-bezier(0.175, 0885, 0.32, 1.275);
}

.dropdown_menu li{
    padding: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dropdown_menu .action_btn{
    width: 100%;
    display: flex;
    justify-content: center;
}

.dropdown_menu.open{
    height: 240px;
}

/* HERO*/
section#hero{
    height: calc(80vh - 60px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

#productName{
    display: inline-block;
    font-size: 4rem;
    font-weight: bold;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, orange 0%,  #9ac7ec 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}


.title{
    display: inline-block;
    font-size: 4.6rem;
    margin-bottom: 0.5rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.9);
    font-family: "SimHei", "Microsoft YaHei", "黑体", sans-serif;
}
.second-title{
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    line-height: 1;
    font-family: "Microsoft YaHei UI", serif;
    font-size: 1.2rem;
    color: rgba(255,255,255,0.7);
}

section#features{
    margin-top: 5rem;
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 10px 20px;
}

#features div{
    display: flex;
    align-items: center;
    gap: 8px;
}

#features div strong{
    font-size: 1.4rem;
}

#buttons{
    display: flex;
    gap: 40px;
}

.join_btn{
    margin-top: 10rem;
    background-color: white;
    border-radius: 20px;
    font-family: Arial, serif;
    width: 320px;
    border-width: 1.5px;
    border-color: white;
    outline: none;
    height: 60px;
    color: black;
    font-size: 1.2rem;
    cursor: pointer;
}
.join_btn:hover{
    color: black;
    background-color: white
}

.download_btn{
    margin-top: 10rem;
    background-color: orange;
    border-radius: 20px;
    font-family: Arial, serif;
    width: 320px;
    outline: none;
    height: 60px;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
}

.download_btn:hover{
    color: white;
}
.download_btn:active{
    border: 2px solid white;
    background-color: orange;
    color: white;
}

/* 响应式设计 */
@media (max-width:  992px) {
    .navbar .links,
    .navbar .action_btn{
        display: none;
    }
    .navbar .toggle_btn{
        display: block;
    }

    .dropdown_menu{
        display: block;
    }
}

@media (max-width: 576px) {
    .dropdown_menu{
        left: 2rem;
        width: unset;
    }
}