*,
*::before,
*::after{
    box-sizing: border-box;
}}

html,
body{
    margin: 0;
    min-height: 100%;
    font-family: var(--i4u-font-sans);
    letter-spacing: -0.011em;
    font-feature-settings: "cv11", "ss01";
    background: var(--i4u-bg-app);
    color: var(--i4u-text-primary);
}

.i4u-auth-page{
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    position: relative;
}

.i4u-auth-theme-toggle{
    position: fixed;
    top: 16px;
    right: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--i4u-radius-md);
    border: 1px solid var(--i4u-border-strong);
    background: var(--i4u-bg-surface);
    color: var(--i4u-text-icon);
    cursor: pointer;
}

.i4u-auth-theme-toggle:hover{
    background: var(--i4u-bg-hover);
    color: var(--i4u-text-primary);
}

.i4u-auth-theme-toggle .i4u-theme-toggle__icon--dark{
    display: none;
}

.i4u-auth-theme-toggle.is-light .i4u-theme-toggle__icon--light{
    display: none;
}

.i4u-auth-theme-toggle.is-light .i4u-theme-toggle__icon--dark{
    display: inline;
}

.i4u-auth-theme-toggle .i4u-theme-toggle__label{
    display: none;
}

[data-theme="light"] .i4u-auth-card{
    border: 1px solid var(--i4u-border-strong);
    box-shadow: var(--i4u-shadow-md);
}

.i4u-auth-card{
    width: 100%;
    max-width: 420px;
    background: var(--i4u-bg-surface);
    border-radius: 28px;
    padding: 40px 36px 32px;
}

.i4u-auth-logo{
    display: block;
    height: 52px;
    width: auto;
    margin: 0 auto 20px;
}

.i4u-auth-title{
    margin: 0 0 28px;
    text-align: center;
    font-size: 15px;
    font-weight: 400;
    color: var(--i4u-text-icon);
    letter-spacing: 0.01em;
}

.i4u-auth-field{
    margin-bottom: 18px;
}

.i4u-auth-field label{
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--i4u-text-muted);
}

.i4u-auth-field input[type="email"],
.i4u-auth-field input[type="password"],
.i4u-auth-field input[type="text"]{
    width: 100%;
    height: 48px;
    padding: 0 20px;
    border: none;
    border-radius: 9999px;
    background: var(--i4u-bg-input);
    color: var(--i4u-text-primary);
    font-size: 15px;
    outline: none;
    transition: box-shadow 0.15s ease;
}

.i4u-auth-field input::placeholder{
    color: var(--i4u-border-hover);
}

.i4u-auth-field input:focus{
    box-shadow: 0 0 0 2px var(--i4u-focus-ring);
}

.i4u-auth-error{
    margin: 6px 0 0 16px;
    font-size: 12px;
    color: var(--i4u-danger);
}

.i4u-auth-password-wrap{
    position: relative;
}

.i4u-auth-password-wrap input[type="password"],
.i4u-auth-password-wrap input[type="text"]{
    padding-right: 48px;
}

.i4u-auth-password-toggle{
    position: absolute;
    top: 50%;
    right: 14px;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--i4u-text-muted);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.i4u-auth-password-toggle:hover{
    color: var(--i4u-text-primary);
    background-color: var(--i4u-bg-hover);
}

.i4u-auth-remember{
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 4px 0 22px 4px;
    cursor: pointer;
    user-select: none;
}

.i4u-auth-remember input[type="checkbox"]{
    appearance: none;
    width: 18px;
    height: 18px;
    margin: 0;
    border: 1.5px solid var(--i4u-border-hover);
    border-radius: 50%;
    background: transparent;
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
}

.i4u-auth-remember input[type="checkbox"]:checked{
    border-color: var(--i4u-primary);
    background: var(--i4u-primary);
}

.i4u-auth-remember input[type="checkbox"]:checked::after{
    content: "";
    position: absolute;
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid var(--i4u-text-primary);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.i4u-auth-remember span{
    font-size: 13px;
    color: var(--i4u-text-muted);
}

.i4u-auth-submit{
    width: 100%;
    height: 50px;
    border: none;
    border-radius: 9999px;
    background: var(--i4u-primary-dark);
    color: var(--i4u-text-on-primary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease, opacity 0.15s ease;
}

.i4u-auth-submit:hover{
    background: var(--i4u-primary-hover);
}

.i4u-auth-submit:disabled{
    opacity: 0.65;
    cursor: not-allowed;
}

.i4u-auth-footer{
    margin: 24px 0 0;
    text-align: center;
    font-size: 12px;
    color: var(--i4u-border-hover);
}

.i4u-auth-recaptcha{
    margin-bottom: 18px;
    display: flex;
    justify-content: center;
}

.i4u-auth-loading{
    display: none;
    width: 100%;
    height: 50px;
    border-radius: 9999px;
    background: var(--i4u-bg-elevated);
    color: var(--i4u-text-muted);
    font-size: 15px;
    align-items: center;
    justify-content: center;
}

.i4u-auth-loading.is-visible{
    display: flex;
}

.i4u-auth-submit.is-hidden{
    display: none;
}