登录页面

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>高级感登录页</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.9.1/gsap.min.js"></script>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

        *,
        *:before,
        *:after {
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
        }

        body {
            margin: 0;
            height: 100vh;
            width: 100%;
            color: black;
            background: #0c0c0b;
            overflow: hidden;
            display: grid;
            place-content: center;
        }


        .login {
            background: #151617;
            width: 20rem;
            padding: 1.5rem;
            border-radius: 1.5rem;
            display: grid;
            gap: 0.5rem;
        }

        .logintext {
            font-family: "Inter";
            color: #6779f5;
            text-align: center;
            font-size: 2rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        @property --anim {
            syntax: "<number>";
            inherits: true;
            initial-value: 0;
        }

        .field {
            background: #6779f5;
            border-radius: 0.75rem;
            position: relative;
            height: 2.5rem;
            --anim: 0;
            transition: --anim 500ms ease;

            background: linear-gradient(to right,
            #6779f5 calc(clamp(0, (var(--anim) - 0.75) / 0.25, 1) * 33%),
            transparent calc(clamp(0, (var(--anim) - 0.75) / 0.25, 1) * 33%),
            transparent calc(100% - clamp(0, (var(--anim) - 0.75) / 0.25, 1) * 33%),
            #6779f5 calc(100% - clamp(0, (var(--anim) - 0.75) / 0.25, 1) * 33%)),
            linear-gradient(to top,
                    transparent calc(15% + clamp(0, (var(--anim) - 0.65) / 0.1, 1) * 70%),
                    #202122 calc(15% + clamp(0, (var(--anim) - 0.65) / 0.1, 1) * 70%)),
            linear-gradient(to right,
                    transparent calc(50% - clamp(0, var(--anim) / 0.65, 1) * 50%),
                    #6779f5 calc(50% - clamp(0, var(--anim) / 0.65, 1) * 50%),
                    #6779f5 calc(50% + clamp(0, var(--anim) / 0.65, 1) * 50%),
                    transparent calc(50% + clamp(0, var(--anim) / 0.65, 1) * 50%)),
            linear-gradient(#202122, #202122);
        }

        .field:has(input:focus) {
            --anim: 1;
        }


        .field > .placeholder {
            pointer-events: none;
            position: absolute;
            inset: 0;
            display: grid;
            place-content: center;
            color: #7d8dff;
            font-family: "Inter";
            transition: transform 500ms ease;
        }

        .field:has(input:focus) > .placeholder,
        .field:has(input:not(:placeholder-shown)) > .placeholder {
            transform: translateY(-50%) scale(0.85)
        }

        .field > input {
            display: flex;
            align-items: center;
            padding-left: 1rem;
            color: white;
            position: absolute;
            inset: 0.125rem;
            border-radius: 0.625rem;
            border: none;
            outline: none;
            background: #202122
        }

        .loginbtn {
            margin-top: 0.5rem;
            background: radial-gradient(circle at center, #6779f5 calc(-50% + var(--anim) * 150%), #202122 calc(var(--anim) * 100%));
            border-radius: 0.75rem;
            position: relative;
            height: 2.5rem;
            display: grid;
            place-content: center;
            color: #7d8dff;
            font-family: "Inter";
            --anim: 0;
            transition: --anim 500ms ease, color 500ms ease;
        }

        .loginbtn:hover {
            --anim: 1;
            color: white;
            cursor: pointer;
        }
    </style>
</head>

<body>
<div class="login">
    <div class="logintext">Login</div>
    <div class="field">
        <input type="text" placeholder="">
        <div class="placeholder">Username</div>
    </div>
    <div class="field">
        <input type="text" placeholder="">
        <div class="placeholder">Password</div>
    </div>
    <div class="loginbtn">Continue</div>
</div>
</body>

</html>
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