/* 清除浏览器默认边距，使边框和内边距的值包含在元素的width和height内 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 使用flex布局，让内容垂直和水平居中 */
section {
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(to bottom, #f1f4f9, #dff1ff);
}

/* 背景颜色 */
section .color {
    position: absolute;
    filter: blur(200px);
}

section .color:nth-child(1) {
    top: -350px;
    width: 600px;
    height: 600px;
    background: #ff359b;
}

section .color:nth-child(2) {
    bottom: -150px;
    left: 100px;
    width: 500px;
    height: 500px;
    background: #fffd87;
}

section .color:nth-child(3) {
    bottom: 50px;
    right: 100px;
    width: 500px;
    height: 500px;
    background: #00d2ff;
}

.box {
    position: relative;
}

/* 背景圆样式 */
.box .circle {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    filter: hue-rotate(calc(var(--x) * 70deg));
    animation: animate 10s linear infinite;
    animation-delay: calc(var(--x) * -1s);
}

/* 背景圆动画 */
@keyframes animate {
    0%, 100% {
        transform: translateY(-50px);
    }
    50% {
        transform: translateY(50px);
    }
}

.box .circle:nth-child(1) {
    top: -50px;
    right: -60px;
    width: 100px;
    height: 100px;
}

.box .circle:nth-child(2) {
    top: 150px;
    left: -100px;
    width: 120px;
    height: 120px;
    z-index: 2;
}

.box .circle:nth-child(3) {
    bottom: 50px;
    right: -60px;
    width: 80px;
    height: 80px;
    z-index: 2;
}

.box .circle:nth-child(4) {
    bottom: -80px;
    left: 100px;
    width: 60px;
    height: 60px;
}

.box .circle:nth-child(5) {
    top: -80px;
    left: 140px;
    width: 60px;
    height: 60px;
}

/* 登录框样式 */
.container {
    position: relative;
    width: 400px;
    min-height: 400px;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.form {
    position: relative;
    width: 100%;
    height: 100%;
    padding: 50px;
}

/* 登录标题样式 */
.form h2 {
    position: relative;
    color: #fff;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 5px;
    margin-bottom: 30px;
    cursor: pointer;
}

/* 登录标题的下划线样式 */
.form h2::before {
    content: "";
    position: absolute;
    left: 0;
    bottom: -10px;
    width: 0px;
    height: 3px;
    background: #fff;
    transition: 0.5s;
}

.form h2:hover:before {
    width: 53px;
}

.form .inputBox {
    width: 100%;
    margin-top: 20px;
}

/* 输入框样式 */
.form .inputBox input {
    width: 100%;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    border: none;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 16px;
    letter-spacing: 1px;
    color: #fff;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.form .inputBox input::placeholder {
    color: #fff;
}

/* 登录按钮样式 */
.form .inputBox input[type="submit"] {
    background: #fff;
    color: #666;
    max-width: 100px;
    margin-bottom: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form .inputBox input:hover,
.form .inputBox input[type="submit"]:hover {
    transform: scale(1.05);
}

.form .inputBox input:focus,
.form .inputBox input[type="submit"]:focus {
    outline: none;
    border-color: #ff359b;
    box-shadow: 0 0 10px rgba(255, 53, 155, 0.5);
}

.forget {
    margin-top: 6px;
    color: #fff;
    letter-spacing: 1px;
}

.forget a {
    color: #fff;
    font-weight: 600;
    text-decoration: none;
}