body {
    background-image: url(../images/1.png);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-position: center center;
    background-attachment: fixed;
}

.logo {
    width: 470px;
    height: 100px;
    margin: 200px auto 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    width: 90px;
    height: 90px;
}

.logo p {
    width: 340px;
    height: 100px;
    line-height: 85px;
    font-size: 102px;
    letter-spacing: 10px;
    font-weight: 550;
    color: #4e6deb;
}

.introduce h2 {
    text-align: center;
    font-size: 40px;
    letter-spacing: 6px;
}

.introduce p {
    text-align: center;
    font-size: 20px;
    letter-spacing: 2px;
}

.start {
    width: 300px;
    height: 150px;
    margin: 40px auto;
    font-size: 40px;
    background-color: #fff;
    border-radius: 15px;
    transition: all 0.3s ease;
}

.start a {
    text-align: center;
    display: block;
    color: #4e6deb;
    font-weight: bold;
    padding: 20px 25px;
    background: white;
    border-radius: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(78, 109, 235, 0.18);
    border: 1px solid rgba(78, 109, 235, 0.12);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.start a:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(78, 109, 235, 0.25);
    background: linear-gradient(to bottom, #f8faff, #f0f5ff);
}

.start a:active {
    transform: translateY(-1px);
    box-shadow: 0 5px 15px rgba(78, 109, 235, 0.2);
}