body {
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background: #f8f8f8 url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI2MCIgaGVpZ2h0PSI2MCIgdmlld0JveD0iMCAwIDYwIDYwIiBmaWxsPSIjZjBmMGYwIj48cGF0aCBkPSJNMzAgMTBjLTExIDAtMjAgOS0yMCAyMHM5IDIwIDIwIDIwIDIwLTkgMjAtMjAtOS0yMC0yMC0yMHptMCAzNmMtOC44IDAtMTYtNy4yLTE2LTE2czctMTYgMTYtMTYgMTYgNy4yIDE2IDE2LTcuMiAxNi0xNiAxNnoiLz48L3N2Zz4=') center/60px;
}

.header {
    width: 100%;
    height: 70px;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
}

.logo {
    float: left;
    margin: 15px 0 0 50px;
    font-size: 28px;
    font-weight: 600;
    color: #2175bc;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav {
    float: right;
    margin: 25px 50px 0 0;
}

.nav a {
    color: #666;
    text-decoration: none;
    margin-left: 30px;
    font-size: 15px;
    transition: color 0.3s;
}

.nav a:hover {
    color: #2175bc;
}

.main {
    margin-top: 120px;
    padding: 40px 0;
}

.register-box {
    width: 460px;
    margin: 0 auto;
    padding: 40px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

h1 {
    margin: 0;
    font-size: 26px;
    color: #2175bc;
    text-align: center;
    font-weight: 600;
}

.sub-title {
    text-align: center;
    color: #999;
    font-size: 14px;
    margin: 10px 0 30px;
}

.form-item {
    margin-bottom: 20px;
    position: relative;
}

.form-item input[type="text"],
.form-item input[type="password"],
.form-item input[type="email"],
.form-item input[type="tel"],
.form-item input[type="date"] {
    width: 100%;
    height: 44px;
    padding: 0 15px;
    border: 1px solid #e5e5e5;
    border-radius: 6px;
    font-size: 14px;
    color: #333;
    transition: all 0.3s;
    box-sizing: border-box;
}

.form-item input:focus {
    border-color: #2175bc;
    outline: none;
    box-shadow: 0 0 0 2px rgba(33,117,188,0.1);
}

.form-item input::placeholder {
    color: #999;
}

.tip {
    font-size: 12px;
    color: #999;
    margin-top: 6px;
    padding-left: 15px;
}

.tooltip {
    display: none;
    position: absolute;
    right: 0;
    top: 50px;
    padding: 5px 10px;
    background: #fff;
    border: 1px solid #ffa500;
    border-radius: 4px;
    color: #d48806;
    font-size: 12px;
}

.agreement {
    font-size: 13px;
    color: #666;
}

.agreement input[type="checkbox"] {
    margin-right: 5px;
}

.agreement a {
    color: #2175bc;
    text-decoration: none;
}

.agreement a:hover {
    color: #1666ca;
    text-decoration: underline;
}

.submit-btn {
    width: 100%;
    height: 44px;
    background: linear-gradient(to bottom, #4b8df8, #3478f6);
    border: none;
    border-radius: 6px;
    color: #fff;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.submit-btn:hover {
    background: linear-gradient(to bottom, #3478f6, #2461e0);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(33,117,188,0.2);
}

.login-link {
    text-align: center;
    font-size: 14px;
    color: #666;
}

.login-link a {
    color: #2175bc;
    text-decoration: none;
    margin-left: 5px;
}

.login-link a:hover {
    color: #1666ca;
    text-decoration: underline;
}