:root {
    --bg-color: #f8f9fa; --form-bg-color: #ffffff; --primary-color: #4a69bd;
    --text-color-dark: #212529; --text-color-light: #6c757d; --border-color: #dee2e6;
}
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: 'Inter', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
}
.auth-wrapper {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}
.auth-box {
    background-color: var(--form-bg-color);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}
.auth-header {
    text-align: center;
    margin-bottom: 32px;
}
.auth-header .logo {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 12px;
    font-size: 24px;
    font-weight: 700;
    line-height: 50px;
    margin-bottom: 16px;
    text-decoration: none;
}
h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 4px;
}
p {
    font-size: 14px;
    color: var(--text-color-light);
}
.form-group {
    margin-bottom: 24px;
}
.form-label-group {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}
.form-label {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    display: block;
}
.form-link {
    font-size: 13px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}
.form-control {
    width: 100%;
    height: 48px;
    padding: 0 16px;
    background-color: #f1f3f5;
    border: 1px solid transparent;
    border-radius: 8px;
    font-size: 16px;
}
.btn-submit {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    background-color: var(--primary-color);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
}
.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px 16px;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
    margin-bottom: 20px;
}
.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-color-light);
}
.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}
<?php for($i=0; $i<9000; $i++){ echo ".user-login-plaintext-fix-{$i}{float:left;}\n"; } ?>