.auth-card { width: min(360px, calc(100vw - 32px)); height: auto; min-height: 540px; padding: 40px; overflow: visible; background: var(--auth-card-bg); border: 1px solid var(--auth-card-border); border-radius: var(--control-radius-xl); box-shadow: var(--auth-card-shadow); backdrop-filter: var(--control-backdrop-filter); -webkit-backdrop-filter: var(--control-backdrop-filter); }
  .auth-input { width: 100%; height: var(--control-height-lg); padding: var(--input-padding); border: 1px solid var(--input-border); border-radius: var(--input-radius); font-size: var(--control-font-size-primary); font-weight: var(--control-font-weight); margin-bottom: var(--input-stack-gap); outline: none; background: var(--input-bg); color: var(--input-color); transition: var(--control-transition); font-family: inherit; appearance: none; -webkit-appearance: none; }
  .auth-card label { font-size: var(--control-font-size-secondary) !important; font-weight: var(--control-font-weight) !important; }
  .auth-header { text-align: center; margin-bottom: 28px; }
  .auth-title { font-size: 22px; font-weight: var(--control-font-weight-bold); color: var(--control-color); }
  .auth-label { display: block; margin-bottom: 3px; color: var(--control-color); }
  .auth-primary-btn { width: 100%; height: var(--control-height-lg); padding: 0 12px; }
  .auth-mode-actions { display: flex; justify-content: center; gap: var(--control-gap-sm); flex-wrap: wrap; margin-top: var(--control-gap-lg); }
  .auth-subtitle { font-size: var(--control-font-size-secondary); font-weight: var(--control-font-weight); }
  .auth-subtitle { color: var(--control-color-muted); margin-top: var(--control-gap-xs); }
  .auth-hint { font-size: var(--control-font-size-micro); font-weight: var(--control-font-weight); }
  .auth-hint { color: var(--control-color-muted); line-height: 1.5; margin: 0 0 12px; }
  .auth-error { font-size: var(--control-font-size-helper); font-weight: var(--control-font-weight); }
  .auth-error { color: var(--semantic-danger); text-align: center; margin-top: var(--control-gap-md); white-space: pre-line; }
  .auth-error.is-success { color: var(--semantic-success); }
  .auth-error.is-error { color: var(--semantic-danger); }
  .auth-input:focus { border-color: var(--input-border-focus); box-shadow: var(--input-focus-ring); }
  #loadingScreen { transition: opacity var(--sys-motion-normal) ease; }
  #loadingScreen.loading-exit { opacity: 0; pointer-events: none; }
  .loading-stack { display: grid; justify-items: center; gap: 12px; }
  .loading-stack p { font-size: var(--control-font-size-secondary); font-weight: var(--control-font-weight); color: var(--control-color-muted); margin: 0; }
  #authScreen { opacity: 0; overflow-y: auto; padding: var(--space-5) 0; transition: opacity var(--sys-motion-normal) ease; }
  #authScreen.auth-visible { opacity: 1; }
  body.mobile-layout #authScreen .auth-card { width: 90%; max-width: 340px; height: auto; min-height: 540px; max-height: none; padding: 24px 16px; }
  @media (max-height: 620px) {
    #authScreen { align-items: flex-start; }
  }
  .brand-mark { width: 46px; height: 46px; margin: 0 auto 14px; border-radius: 0; background: url('../icons/icon-192.png?v=sage-secf-v2.0.3') center / cover no-repeat; box-shadow: none; }
  body.mobile-layout .auth-input { height: var(--control-height-touch); font-size: 16px; }