* {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            background: #f4f7fb;
            color: #1f2937;
            font-family: Arial, "Microsoft YaHei", sans-serif;
        }

        .card {
            width: 100%;
            max-width: 440px;
            padding: 30px;
            background: #fff;
            border-radius: 14px;
            box-shadow: 0 12px 35px rgba(0, 0, 0, .08);
        }

        h1 {
            margin: 0 0 25px;
            text-align: center;
            font-size: 25px;
        }

        label {
            display: block;
            margin: 15px 0 7px;
            font-weight: 600;
        }

        input {
            width: 100%;
            padding: 12px;
            border: 1px solid #d5dae3;
            border-radius: 7px;
            font-size: 15px;
            outline: none;
        }

        input:focus {
            border-color: #1677ff;
        }

        button {
            width: 100%;
            margin-top: 23px;
            padding: 13px;
            border: 0;
            border-radius: 7px;
            background: #1677ff;
            color: #fff;
            font-size: 16px;
            cursor: pointer;
        }

        .error {
            margin-bottom: 18px;
            padding: 12px;
            border: 1px solid #ffccc7;
            border-radius: 7px;
            background: #fff2f0;
            color: #cf1322;
        }

        .links {
            margin-top: 20px;
            text-align: center;
        }

        a {
            color: #1677ff;
            text-decoration: none;
        }

        .tip {
            margin-top: 7px;
            color: #8a9099;
            font-size: 13px;
        }