/* All rules are scoped to the child dialog; native sign pages remain untouched. */
#u_sign.child-auth-modal {
    --auth-tab: 0;
    --auth-tab-count: 2;
    --auth-surface: var(--main-bg-color, #fff);
    --auth-ink: #282828;
    --auth-muted: #85858b;
    --auth-line: #dedee6;
    --auth-accent: var(--focus-color, var(--theme-color, #0066ff));
    padding: 20px !important;
    overflow-y: auto;
    overscroll-behavior: contain;
}
.dark-theme #u_sign.child-auth-modal { --auth-ink: #e8e8ed; --auth-line: #44464e; --auth-muted: #a3a5ad; }
#u_sign.child-auth-modal .modal-dialog {
    width: 330px;
    max-width: 100%;
    margin: 0 auto;
    min-height: 100%;
    display: flex;
    align-items: center;
    transform: translateY(16px);
    transition: transform .25s ease;
}
#u_sign.child-auth-modal.in .modal-dialog { transform: translateY(0); }
#u_sign.child-auth-modal .sign-content { width: 100%; margin: 0; padding: 0; }
#u_sign.child-auth-modal .sign.child-auth-card {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 18px;
    border-radius: 16px;
    background: var(--auth-surface);
    color: var(--auth-ink);
    box-shadow: 0 24px 80px rgba(0,0,0,.18);
    backdrop-filter: none;
}
#u_sign.child-auth-modal .child-auth-close {
    position: absolute; right: 9px; top: 9px;
    width: 24px; height: 24px; padding: 4px; border-radius: 50%;
    color: var(--auth-muted); opacity: 1; background: transparent;
}
#u_sign.child-auth-modal .child-auth-close:hover { background: var(--muted-bg-color); }
#u_sign.child-auth-modal .child-auth-brand { text-align: center; margin: 4px 0 12px; font-size: 18px; font-weight: 600; }
#u_sign.child-auth-modal .child-auth-brand img { max-width: 145px; max-height: 36px; width: auto; object-fit: contain; }
#u_sign.child-auth-modal .child-auth-tabs {
    display: flex; position: relative; width: 230px; max-width: 100%; padding: 3px; margin: 0 auto 12px;
    background: var(--muted-bg-color, #f5f5f5); border: 1px solid var(--auth-line); border-radius: 10px;
}
#u_sign.child-auth-modal .child-auth-tab-indicator {
    position: absolute; left: 3px; top: 3px; bottom: 3px;
    width: calc((100% - 6px) / var(--auth-tab-count));
    border-radius: 7px; background: var(--auth-accent);
    transform: translateX(calc(var(--auth-tab) * 100%)); transition: transform .26s cubic-bezier(.22,.68,0,1);
    box-shadow: 0 2px 4px rgba(0,0,0,.06); pointer-events: none;
}
#u_sign.child-auth-modal .child-auth-tabs a { position: relative; flex: 1; padding: 4px; font-size: 13px; font-weight: 500; line-height: 20px; text-align: center; color: var(--auth-muted); transition: color .2s; }
#u_sign.child-auth-modal .child-auth-tabs a[aria-selected="true"] { color: #fff; }
#u_sign.child-auth-modal .child-auth-card > .tab-content > #tab-sign-in > .box-body,
#u_sign.child-auth-modal .child-auth-card > .tab-content > #tab-sign-up > .box-body { display: none; }
#u_sign.child-auth-modal .tab-content { margin: 0; padding: 0; }
#u_sign.child-auth-modal .tab-pane { transition: opacity .18s ease; }
#u_sign.child-auth-modal .tab-pane.active { animation: child-auth-enter .22s ease both; }
@keyframes child-auth-enter { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
#u_sign.child-auth-modal form { margin: 0; }
#u_sign.child-auth-modal #sign-in, #u_sign.child-auth-modal #sign-up { padding: 0; }
#u_sign.child-auth-modal .child-auth-field { position: relative; padding: 20px 0 0; margin: 0 0 10px; border: 0; }
#u_sign.child-auth-modal .child-auth-label { position: absolute; left: 0; top: 0; margin: 0; color: var(--auth-muted); font-size: 12px; line-height: 18px; font-weight: 400; }
#u_sign.child-auth-modal .line-form-input {
    display: block; width: 100%; height: 36px; margin: 0; padding: 0 34px;
    border: 1px solid var(--auth-line); border-radius: 8px;
    background: var(--auth-surface); color: var(--auth-ink);
    font-size: 14px; font-weight: 400; line-height: normal;
    transition: border-color .2s, box-shadow .2s;
}
#u_sign.child-auth-modal .line-form-input::placeholder { color: var(--auth-muted); opacity: .65; }
#u_sign.child-auth-modal .line-form-input:focus { border-color: var(--auth-accent); outline: 0; box-shadow: 0 0 0 2px color-mix(in srgb, var(--auth-accent) 18%, transparent); }
#u_sign.child-auth-modal .line-form-line { display: none; }
#u_sign.child-auth-modal .child-auth-field-icon { position: absolute; left: 11px; top: 30px; width: 16px; height: 16px; color: var(--auth-muted); pointer-events: none; }
#u_sign.child-auth-modal .child-auth-password { display: flex; align-items: center; justify-content: center; position: absolute; right: 3px; top: 23px; width: 30px; height: 30px; padding: 6px; border: 0; border-radius: 7px; background: transparent; color: var(--auth-muted); }
#u_sign.child-auth-modal .child-auth-password:hover { color: var(--auth-ink); background: var(--muted-bg-color); }
#u_sign.child-auth-modal .child-auth-password svg, #u_sign.child-auth-modal .child-auth-field-icon svg { width: 100%; height: 100%; display: block; }
#u_sign.child-auth-modal .child-auth-password svg, #u_sign.child-auth-modal .child-auth-field-icon svg,
#u_sign.child-auth-modal .child-auth-password svg *, #u_sign.child-auth-modal .child-auth-field-icon svg * { fill: none; }
#u_sign.child-auth-modal .child-auth-field > .abs-right { top: 20px; height: 36px; right: 8px; display: flex; align-items: center; }
#u_sign.child-auth-modal .child-auth-field.change-show { display: block !important; padding-right: 100px; }
#u_sign.child-auth-modal .child-auth-field.change-show > .yztx { right: 0; }
#u_sign.child-auth-modal .child-auth-field.change-show .captchsubmit { height: 36px; width: 92px; padding: 0 5px; margin: 0; border: 1px solid var(--auth-line); border-radius: 8px; background: transparent; color: var(--auth-ink); font-size: 12px; }
#u_sign.child-auth-modal .child-auth-field.change-show .match-ok { right: 108px; }
#u_sign.child-auth-modal .child-auth-field.change-show input { padding-right: 30px; }
#u_sign.child-auth-modal .line-form.em09 { font-size: 12px; margin: 2px 0 10px; padding: 0; display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
#u_sign.child-auth-modal .line-form.em09 .pull-right { float: none !important; text-align: right; }
#u_sign.child-auth-modal form .box-body { padding: 0; margin: 0; }
#u_sign.child-auth-modal .child-auth-login-policy { font-size: 11px; color: var(--auth-muted); line-height: 1.6; margin-bottom: 10px; }
/* Keep submit buttons compact and centered, shrinking further on narrow screens. */
#u_sign.child-auth-modal .signsubmit-loader,
#u_sign.child-auth-modal .invit-code-verify {
    display: block;
    width: min(100%, 210px);
    margin-inline: auto;
}
#u_sign.child-auth-modal .box-body > .form-checkbox { display: flex; align-items: flex-start; gap: 5px; text-align: left; margin: 0 0 10px; font-size: 11px; line-height: 1.8; opacity: 1; }
#u_sign.child-auth-modal .box-body > .form-checkbox input { flex-shrink: 0; margin-top: 5px; }
#u_sign.child-auth-modal .box-body > .form-checkbox label { margin: 0; }
#u_sign.child-auth-modal .child-auth-social:empty { display: none; }
#u_sign.child-auth-modal .child-auth-social .social-separator { margin: 14px 0 10px; color: var(--auth-muted); font-size: 11px; }
#u_sign.child-auth-modal .child-auth-social .social_loginbar { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
#u_sign.child-auth-modal .child-auth-social .social-login-item {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    width: auto; min-width: 140px; min-height: 36px; margin: 0; padding: 3px 12px;
    border: 1px solid var(--auth-line); border-radius: 8px;
    background: transparent; color: var(--auth-ink) !important; font-size: 13px; line-height: 24px;
}
#u_sign.child-auth-modal .child-auth-social .social-login-item i { color: inherit !important; }
/* The same decorative QQ image used by the reference site's auth dialog. */
#u_sign.child-auth-modal .child-auth-social .social-login-item.qq .fa-qq {
    display: inline-block; flex: 0 0 18px; width: 18px; height: 21px; margin: 0;
    background: url("images/qq-login.png") center / contain no-repeat;
    font-size: 0; line-height: 0;
}
#u_sign.child-auth-modal .child-auth-social .social-login-item.qq .fa-qq::before { content: none; }
#u_sign.child-auth-modal .child-auth-social .social-login-item svg { color: inherit !important; }
#u_sign.child-auth-modal .child-auth-social .social-login-item svg { width: 24px; height: 24px; }
#u_sign.child-auth-modal .child-auth-social .social-login-item:hover { background: var(--muted-bg-color); }
#u_sign.child-auth-modal .child-auth-social > .px12 { font-size: 11px; }
#u_sign.child-auth-modal.child-auth-qrcode .child-auth-social { display: none; }
#u_sign.child-auth-modal a:focus-visible, #u_sign.child-auth-modal button:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 3px; }
@media (max-width: 540px) {
    #u_sign.child-auth-modal { padding: 12px !important; }
    #u_sign.child-auth-modal .line-form-input { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
    #u_sign.child-auth-modal, #u_sign.child-auth-modal *, #u_sign.child-auth-modal .modal-dialog { animation: none !important; transition: none !important; }
}