.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

:where(button, a, input, select, textarea, [tabindex]):focus-visible {
    outline: 2px solid transparent;
    box-shadow: var(--focus-ring);
}

.module-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    min-height: 12rem;
    color: var(--color-text-muted);
}

.app-toast-region {
    position: fixed;
    z-index: 12000;
    inset: var(--space-4) var(--space-4) auto auto;
    display: grid;
    gap: var(--space-2);
    max-width: min(26rem, calc(100vw - 2rem));
}

.app-toast {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-left: 0.3rem solid var(--color-primary);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    box-shadow: var(--shadow-modal);
}

.app-toast-success { border-left-color: var(--color-success); }
.app-toast-warning { border-left-color: var(--color-warning); }
.app-toast-error { border-left-color: var(--color-danger); }

.app-update-banner {
    position: sticky;
    z-index: 12500;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    width: 100%;
    padding: var(--space-4) var(--space-5);
    border-bottom: 3px solid var(--color-primary);
    background: linear-gradient(90deg, var(--color-primary-light) 0%, var(--color-surface) 72%);
    color: var(--color-text);
    box-shadow: 0 0.4rem 1.4rem rgba(15, 23, 42, 0.22);
    animation: app-update-banner-enter 0.22s ease-out;
}

body.has-app-update-banner {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

body.has-app-update-banner .app-container {
    flex: 1 1 auto;
    min-height: 0;
    height: auto;
}

.app-update-banner-content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 0;
}

.app-update-banner-content > i {
    display: inline-grid;
    flex: 0 0 auto;
    place-items: center;
    width: 2.6rem;
    height: 2.6rem;
    border-radius: var(--ui-radius-pill);
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 0.25rem 0.7rem rgba(15, 23, 42, 0.2);
    font-size: 1.2rem;
}

.app-update-banner-message {
    display: grid;
    gap: var(--space-1);
    min-width: 0;
}

.app-update-banner-message strong {
    color: var(--color-primary);
    font-size: 1rem;
    font-weight: 800;
}

.app-update-banner-message span {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.app-update-banner-actions {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    gap: var(--space-2);
}

.app-update-banner-actions .btn {
    min-height: var(--ui-control-height-40px);
    padding-inline: var(--space-4);
    font-weight: 700;
}

.app-update-banner-actions .btn.primary {
    min-width: 7.5rem;
    box-shadow: 0 0.3rem 0.8rem rgba(15, 23, 42, 0.24);
}

.app-update-banner-actions .btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 0.45rem 1rem rgba(15, 23, 42, 0.28);
}

.app-update-banner-actions .btn.outline {
    border-width: 2px;
    background: var(--color-surface);
}

.app-update-banner-warning {
    border-bottom-color: var(--color-warning);
    background: linear-gradient(90deg, #fffaeb 0%, var(--color-surface) 72%);
}

.app-update-banner-warning .app-update-banner-content > i {
    background: var(--color-warning);
    color: #fff;
}

.app-update-banner-warning .app-update-banner-message strong {
    color: var(--color-warning);
}

@keyframes app-update-banner-enter {
    from { opacity: 0; transform: translateY(-0.5rem); }
    to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    .app-update-banner { animation: none; }
    .app-update-banner-actions .btn.primary:hover { transform: none; }
}

@media (max-width: 48rem) {
    .app-update-banner {
        align-items: stretch;
        flex-direction: column;
        gap: var(--space-3);
        padding: var(--space-3) var(--space-4);
    }

    .app-update-banner-actions {
        justify-content: flex-end;
    }
}

@media (max-width: 30rem) {
    .app-update-banner-actions .btn {
        flex: 1 1 0;
    }
}

.app-dialog-overlay {
    position: fixed;
    z-index: 13000;
    inset: 0;
    display: grid;
    place-items: center;
    padding: var(--space-4);
    background: rgba(15, 23, 42, 0.64);
}

.app-dialog {
    width: min(34rem, 100%);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    color: var(--color-text);
    box-shadow: var(--shadow-modal);
}

.app-dialog-stage {
    color: var(--color-danger);
    font-weight: 700;
}

.app-dialog-stage-neutral { color: var(--color-primary); }

.app-dialog h2 { margin: var(--space-2) 0; }

.app-dialog-impact,
.app-dialog-guidance {
    display: grid;
    gap: var(--space-1);
    margin-top: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--color-surface-muted);
}

.app-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
    margin-top: var(--space-5);
}

.app-error-summary {
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-danger);
    border-radius: var(--radius-md);
    color: var(--color-danger);
    background: #fff5f4;
}

@media (forced-colors: active) {
    .app-toast,
    .app-update-banner,
    .app-dialog,
    .app-error-summary { border: 2px solid CanvasText; }
}