/* 全局样式 */
body {
    font-family: 'Poppins', sans-serif;
    background-color: #ffffff;
    /* 白色背景 */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}



/* 输入框样式 */
.form-line {
    border: none;
    background-image: linear-gradient(#FF0A16, #FF0A16), linear-gradient(#FF0A16, #FF0A16);
    background-size: 0 2px, 100% 0px;
    background-repeat: no-repeat;
    background-position: 50% 100%;
    background-color: rgba(0, 0, 0, 0);
    font-size: 20px;
    /* 调整字体大小 */
    width: 70%;
    /* 宽度调整为容器的70%，为下拉菜单留出空间 */
    padding: 10px;
    /* 内边距 */
    transition: background-size 0.3s;
    /* 平滑过渡效果 */
    top: 50px;
    color: #f9f9f9;
}

input[type="text"]:focus {
    background-size: 100% 2px, 100% 1px;
    transition: all 0.4s;
    border: none;
    outline: none;
    font-size: 20px;
    width: 80%;
    color: #f9f9f9;
}

input::placeholder {
    color: #999;
    font-size: 20px;
    /* 调整字体大小 */
}

/* 按钮样式 */
button {
    border: 2px solid #FF0A16;
    color: #ffffff;
    background-color: #000000;
    padding: 10px 20px;
    font-size: 18px;
    border-radius: 40px;
    margin: 0 10px;
    /* 与输入框和下拉菜单按钮的间距 */
    transition: background-color 0.3s, color 0.3s;
}

button:hover {
    background-color: #FF0A16;
    color: #ffffff;
}

.dropdown {
    position: relative;
    left: 10px;
    display: inline-block;
}

/* 下拉菜单样式 */
.dropbtn {
    background-color: #FF0A16;
    color: #ffffff;
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    padding: 10px 20px;
    font-size: 18px;
    border-radius: 40px;
    margin: 0 10px;
} 

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.2);
    z-index: 1;
    border-radius: 20px;
}

.dropdown-content a {
    color: #999;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s;
}

.dropdown-content a:hover {
    background-color: #FF0A16;
    color: #ffffff;
    border-radius: 20px;
}

.dropdown:hover .dropdown-content {
    display: inline-block;
}
.dropdown:click .dropdown-content {
    display: inline-block;
}
.dropdown:hover .dropbtn {
    background-color: #ffffff;
    color: #FF0A16;
}

/* 段落样式 */
p {
    color: #d8d4d4;
    font-size: 20px;
    margin-top: 10px;
}

.section {
    margin-bottom: 20px;
    padding: 10px;
    border: 1px solid #999999;
    border-radius: 5px;
    width: 70%;
}

hr {
    margin: 20px 0;
}

input::-moz-input-placeholder {
    position: absolute;
    top: .04rem;
    font: 400 .16rem PingFangSC-Regular, PingFang SC;
    color: #999;
}

/*与button有关*/
span {
    position: absolute;
    transform: translate(-50%, -50%);
    pointer-events: none;
    border-radius: 50%;
    animation: animate 3s linear infinite;
    background: #ffffff;
    font-size: 20px;
}

@keyframes animate {
    0% {
        width: 0px;
        height: 0px;
        opacity: .5;
    }

    20% {
        width: 200px;
        height: 200px;
        opacity: 0.2;
    }

    100% {
        width: 500px;
        height: 500px;
        opacity: 0;
    }
}