header {
    background-color: #FFFFFF;
    color: #000000;
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    border-bottom-width: 0px;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header .logo {
    font-size: 16px;
    font-weight: normal;
    color: #000000;
    padding-right: 11px;
    border-bottom-width: 2px;
    border-bottom-color: #676767;
}

header nav {
    display: flex;
    gap: 20px;
    position: relative;
}

header nav button {
    background-color: #303030;
    color: #fff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 6px;
}

body {
    height: 100vh;
    margin: 0;
}

.main-content {
    display: flex;
    flex-direction: column;
    border: 0px solid;
    background-color: rgb(255, 255, 255);
    top: 10%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px;
}

.main-title {
    font-size: 40px;
    color: #333;
    margin-bottom: 10px;
}

.main-description {
    font-size: 1.2em;
    color: #666;
    margin-bottom: 20px;
}

/* ============================== */
/* 表单区域: 关键修正在下面几段！ */
/* ============================== */

.form-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    background-color: #ffffff;
}

.form-group {
    position: relative;
    margin-bottom: 10px;
    width: 100%;
}

.form-control,
.form-button {
    width: 100%;
    box-sizing: border-box;
}

.form-control {
    border: 1px solid #c0c0c0;
    background-color: #fafafa;
    border-radius: 3px;
    height: 40px;
    font-size: 18px;
    padding: 10px 12px;
    margin-bottom: 1px;
}

.form-control:focus {
    border-color: #007bff;
    background-color: #fff;
    color: #000;
    outline: none;
}

.form-label {
    position: absolute;
    top: 50%;
    left: 0;
    padding: 5px;
    font-size: 18px;
    color: #888;
    transform: translateY(-50%);
    transition: transform 0.3s, font-size 0.3s;
}

.label-focused {
    transform: translateY(-25px);
    font-size: 12px;
}

.form-button {
    padding: 10px 12px;
    background-color: #000000;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 20px;
    margin-top: 10px;
}

.form-button:hover {
    background-color: #232323;
}

.注册账号 {
    /* text-align: center; */
    margin-bottom: 15px;
    margin-top: 3px;
    font-size: 18px;
}

.注册账号 p {
    margin-bottom: 3px;
    margin-top: 3px;
    font-size: 18px;
}

.注册账号 h1 {
    margin-bottom: 3px;
    margin-top: 3px;
}

.form-check {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.form-check-input {
    margin-right: 10px;
}

.form-check-label {
    font-size: 15px;
    color: #333;
}

.forgot a {
  color: #475569;
  text-decoration: none;
}
.forgot a:hover { text-decoration: underline; }

footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: #ffffff;
    color: #474747;
    text-align: center;
    padding: 5px 0;
    font-size: 10px;
}


.forgot {
    display: flex;
    flex-direction: column;
    margin: 10px 0px;
}

div#top {
    padding: 10px;
}