body {
    background: #f4f4f4;
    font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.login-container {
    max-width: 360px;
    margin: 80px auto 0 auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    padding: 32px 24px 24px 24px;
}
.login-title {
    text-align: center;
    font-size: 1.6em;
    margin-bottom: 28px;
    color: #333;
    letter-spacing: 2px;
}
.login-input {
    width: 100%;
    padding: 14px 12px;
    margin-bottom: 18px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1em;
    background: #fafafa;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s;
}
.login-input:focus {
    border-color: #409eff;
    background: #fff;
}
.login-btn {
    width: 100%;
    padding: 14px 0;
    background: #409eff;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 1.1em;
    font-weight: bold;
    letter-spacing: 2px;
    cursor: pointer;
    transition: background 0.2s;
}
.login-btn:active {
    background: #3076c9;
}
.error-message {
    color: #e74c3c;
    font-weight: bold;
    text-align: center;
    margin-bottom: 16px;
}
@media (max-width: 400px) {
    .login-container {
        margin: 30px 8px 0 8px;
        padding: 24px 8px 16px 8px;
    }
}