/* Shared public UI foundation: focus, feedback, forms, empty states. */
:root {
    --ui-foundation-ring: 0 0 0 3px color-mix(in srgb, var(--primary, #2563eb) 28%, transparent);
    --ui-foundation-danger: var(--danger, #dc2626);
    --ui-foundation-warning: var(--warning, #d97706);
    --ui-foundation-success: var(--success, #16a34a);
    --ui-foundation-info: var(--info, #2563eb);
}

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
    outline: 3px solid color-mix(in srgb, var(--primary, #2563eb) 34%, transparent);
    outline-offset: 3px;
}

:where(.btn, .ui-admin-btn, .btn-submit-mod, .btn-cancel-mod, .download-card, .topic-dl-card):focus-visible {
    box-shadow: var(--ui-foundation-ring);
}

/* Shared component contracts. Use these for new or migrated UI. */
:where(.ui-stack) {
    display: grid;
    gap: var(--component-gap-md, 1rem);
}

:where(.ui-grid) {
    display: grid;
    gap: var(--component-gap-md, 1rem);
}

:where(.ui-cluster) {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--component-gap-sm, .75rem);
}

:where(.ui-container) {
    width: min(100%, var(--container-xl, 1200px));
    margin-inline: auto;
    padding-inline: var(--container-padding, var(--space-4, 1rem));
}

:where(.ui-page) {
    min-width: 0;
}

:where(.ui-section) {
    min-width: 0;
}

:where(.ui-surface, .ui-card, .ui-panel) {
    border: 1px solid var(--card-border, var(--ui-border, #d8dee8));
    border-radius: var(--card-radius, var(--ui-radius, 8px));
    background: var(--card-bg, var(--ui-surface, #fff));
    color: var(--color-text, var(--text, #111827));
    box-shadow: var(--card-shadow, var(--ui-shadow, none));
}

:where(.ui-card) {
    padding: var(--card-padding, 1.25rem);
}

:where(.ui-panel) {
    overflow: hidden;
}

:where(.ui-card__head, .ui-panel__head, .ui-card__body, .ui-panel__body, .ui-card__foot, .ui-panel__foot) {
    min-width: 0;
}

:where(.ui-card__head, .ui-panel__head, .ui-card__body, .ui-panel__body) {
    padding: var(--card-padding, 1.25rem);
}

:where(.ui-card__foot, .ui-panel__foot) {
    padding: var(--space-4, 1rem) var(--card-padding, 1.25rem);
}

:where(
    .ui-card__title,
    .ui-card__text,
    .ui-card__meta,
    .ui-card__media,
    .ui-card__actions,
    .ui-card__icon,
    .ui-card__badge,
    .ui-panel__title,
    .ui-panel__text,
    .ui-panel__meta,
    .ui-panel__media,
    .ui-panel__actions,
    .ui-panel__icon,
    .ui-panel__badge
) {
    min-width: 0;
}

.ui-button,
[data-ui-button] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2, .5rem);
    min-height: var(--button-height, 2.5rem);
    max-width: 100%;
    padding: 0 var(--button-padding-x, 1rem);
    border: 1px solid transparent;
    border-radius: var(--button-radius, var(--control-radius, 8px));
    background: var(--color-primary, var(--primary, #8b1538));
    color: var(--color-on-primary, var(--on-primary, #fff));
    font: inherit;
    font-size: var(--button-font-size, .875rem);
    font-weight: var(--button-font-weight, 700);
    line-height: 1.1;
    letter-spacing: var(--letter-spacing-normal, 0);
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-control, border-color 150ms ease, box-shadow 150ms ease, background-color 150ms ease, color 150ms ease);
}

.ui-button:hover,
[data-ui-button]:hover {
    background: var(--color-primary-hover, var(--primary-dark, #6d1029));
    color: var(--color-on-primary, #fff);
}

.ui-button:focus-visible,
[data-ui-button]:focus-visible {
    outline: 0;
    box-shadow: var(--state-focus-ring, var(--ui-foundation-ring));
}

.ui-button:disabled,
.ui-button[aria-disabled="true"],
[data-ui-button]:disabled,
[data-ui-button][aria-disabled="true"] {
    cursor: not-allowed;
    opacity: var(--state-disabled-opacity, .55);
}

.ui-button.is-loading,
[data-ui-button].is-loading,
[data-ui-button][aria-busy="true"] {
    cursor: progress;
    opacity: var(--state-loading-opacity, .72);
}

.ui-button--secondary {
    border-color: var(--color-border, var(--border, #d8dee8));
    background: var(--color-surface, var(--ui-surface, #fff));
    color: var(--color-text, var(--text, #111827));
}

.ui-button--secondary:hover {
    background: var(--state-hover-bg, var(--bg-hover, #eef2f7));
    color: var(--color-text, var(--text, #111827));
}

.ui-button--danger {
    background: var(--color-danger, #dc2626);
    color: #fff;
}

.ui-field {
    display: grid;
    gap: var(--space-2, .5rem);
    min-width: 0;
}

.ui-label {
    color: var(--color-text, var(--text, #111827));
    font-size: var(--font-size-sm, .875rem);
    font-weight: var(--font-weight-semibold, 700);
    line-height: var(--line-height-snug, 1.35);
}

.ui-input,
.ui-select,
.ui-textarea,
[data-ui-input] {
    width: 100%;
    min-height: var(--input-height, var(--control-height, 2.5rem));
    padding: var(--control-padding-y, .5rem) var(--input-padding-x, .75rem);
    border: 1px solid var(--input-border, var(--border, #d8dee8));
    border-radius: var(--input-radius, var(--control-radius, 8px));
    background: var(--input-bg, var(--ui-surface, #fff));
    color: var(--input-text, var(--text, #111827));
    font: inherit;
    font-size: var(--input-font-size, .875rem);
    line-height: var(--line-height-base, 1.5);
    transition: var(--transition-control, border-color 150ms ease, box-shadow 150ms ease);
}

.ui-textarea {
    min-height: 7.5rem;
    resize: vertical;
}

.ui-input::placeholder,
.ui-textarea::placeholder,
[data-ui-input]::placeholder {
    color: var(--input-placeholder, var(--text-light, #94a3b8));
}

.ui-input:focus,
.ui-select:focus,
.ui-textarea:focus,
[data-ui-input]:focus {
    border-color: var(--color-primary, var(--primary, #8b1538));
    outline: 0;
    box-shadow: var(--state-focus-ring, var(--ui-foundation-ring));
}

.ui-input:disabled,
.ui-select:disabled,
.ui-textarea:disabled,
[data-ui-input]:disabled {
    background: var(--state-disabled-bg, #f8fafc);
    color: var(--state-disabled-text, #94a3b8);
    cursor: not-allowed;
}

.ui-help,
.ui-error {
    font-size: var(--font-size-xs, .75rem);
    line-height: var(--line-height-snug, 1.35);
}

.ui-help {
    color: var(--color-text-muted, var(--text-dim, #64748b));
}

.ui-error {
    color: var(--state-error-text, var(--ui-foundation-danger));
    font-weight: var(--font-weight-semibold, 700);
}

.ui-check,
.ui-radio,
.ui-switch {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2, .5rem);
    min-height: var(--control-height-sm, 2rem);
    color: var(--color-text, var(--text, #111827));
    font-size: var(--font-size-sm, .875rem);
    font-weight: var(--font-weight-medium, 500);
}

.ui-check input,
.ui-radio input {
    width: 1rem;
    height: 1rem;
    accent-color: var(--color-primary, var(--primary, #8b1538));
}

.ui-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3, .75rem);
    padding: var(--space-4, 1rem);
    border: 1px solid var(--color-border, #d8dee8);
    border-radius: var(--radius-card, 8px);
    background: var(--color-surface-muted, #f8fafc);
    color: var(--color-text, #111827);
    line-height: var(--line-height-base, 1.5);
}

.ui-alert--success {
    border-color: color-mix(in srgb, var(--color-success, #10b981) 34%, var(--color-border, #d8dee8));
    background: var(--state-success-bg, #d1fae5);
    color: var(--state-success-text, #10b981);
}

.ui-alert--warning {
    border-color: color-mix(in srgb, var(--color-warning, #b45309) 34%, var(--color-border, #d8dee8));
    background: var(--state-warning-bg, #fef3c7);
    color: var(--state-warning-text, #b45309);
}

.ui-alert--error {
    border-color: color-mix(in srgb, var(--color-danger, #dc2626) 34%, var(--color-border, #d8dee8));
    background: var(--state-error-bg, #fee2e2);
    color: var(--state-error-text, #dc2626);
}

.ui-alert--info {
    border-color: color-mix(in srgb, var(--color-info, #2563eb) 34%, var(--color-border, #d8dee8));
    background: var(--state-info-bg, #dbeafe);
    color: var(--state-info-text, #2563eb);
}

.ui-table-wrap {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--color-border, #d8dee8);
    border-radius: var(--radius-card, 8px);
    background: var(--color-surface, #fff);
}

.ui-table {
    width: 100%;
    border-collapse: collapse;
    color: var(--color-text, #111827);
    font-size: var(--font-size-sm, .875rem);
}

.ui-table th,
.ui-table td {
    padding: var(--space-3, .75rem) var(--space-4, 1rem);
    border-bottom: 1px solid var(--color-border, #d8dee8);
    text-align: left;
    vertical-align: middle;
}

.ui-table th {
    background: var(--color-surface-muted, #f8fafc);
    color: var(--color-text-muted, #64748b);
    font-size: var(--font-size-xs, .75rem);
    font-weight: var(--font-weight-bold, 700);
}

.ui-empty {
    display: grid;
    place-items: center;
    gap: var(--space-3, .75rem);
    min-height: 10rem;
    padding: var(--space-6, 1.5rem);
    border: 1px dashed var(--color-border, #d8dee8);
    border-radius: var(--radius-card, 8px);
    background: var(--state-empty-bg, #f8fafc);
    color: var(--state-empty-text, #64748b);
    text-align: center;
}

.ui-loader {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid color-mix(in srgb, currentColor 22%, transparent);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: ui-foundation-spin var(--duration-fast, .75s) linear infinite;
}

.ui-pagination {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-2, .5rem);
}

.ui-pagination__page {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    min-height: 2.25rem;
    padding: 0 var(--space-3, .75rem);
    border: 1px solid var(--color-border, #d8dee8);
    border-radius: var(--radius-control, 8px);
    background: var(--color-surface, #fff);
    color: var(--color-text, #111827);
    font-size: var(--font-size-sm, .875rem);
    font-weight: var(--font-weight-semibold, 700);
    text-decoration: none;
}

.ui-pagination__page[aria-current="page"],
.ui-pagination__page.is-active {
    border-color: var(--color-primary, #8b1538);
    background: var(--color-primary, #8b1538);
    color: var(--color-on-primary, #fff);
}

.ui-modal-backdrop,
.ui-drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal-backdrop, 1050);
    background: var(--modal-backdrop, rgba(15, 23, 42, .58));
}

.ui-modal {
    position: fixed;
    inset: 50% auto auto 50%;
    z-index: var(--z-modal, 1060);
    width: min(100% - 2rem, var(--ui-modal-width, 36rem));
    max-height: calc(100dvh - 2rem);
    overflow: auto;
    transform: translate(-50%, -50%);
    border: 1px solid var(--modal-border, var(--color-border, #d8dee8));
    border-radius: var(--modal-radius, 10px);
    background: var(--modal-bg, var(--color-surface, #fff));
    color: var(--color-text, #111827);
    box-shadow: var(--modal-shadow, 0 24px 70px rgba(15, 23, 42, .2));
}

.ui-tooltip,
.ui-popover {
    z-index: var(--z-tooltip, 1080);
    border-radius: var(--tooltip-radius, 6px);
    background: var(--tooltip-bg, #111827);
    color: var(--tooltip-text, #fff);
    font-size: var(--font-size-xs, .75rem);
    line-height: var(--line-height-snug, 1.35);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
    }

    .ui-loader,
    .topic-dl-spinner,
    .btn-submit-mod.is-submitting i,
    .is-ui-loading i {
        animation-duration: 1ms !important;
        animation-iteration-count: 1 !important;
    }
}

.topic-toast {
    align-items: flex-start;
}

.topic-toast .toast-content {
    display: grid;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.topic-toast .toast-title {
    font-weight: 800;
    line-height: 1.25;
}

.topic-toast .toast-message {
    min-width: 0;
}

.topic-toast .toast-detail {
    color: color-mix(in srgb, currentColor 74%, transparent);
    font-size: .82rem;
    line-height: 1.35;
}

.topic-toast .toast-action {
    justify-self: start;
    margin-top: 6px;
    min-height: 30px;
    padding: 5px 10px;
    border: 1px solid color-mix(in srgb, currentColor 28%, transparent);
    border-radius: 8px;
    background: color-mix(in srgb, currentColor 8%, transparent);
    color: inherit;
    font: inherit;
    font-size: .78rem;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
}

.topic-toast .toast-action:hover,
.topic-toast .toast-action:focus-visible {
    background: color-mix(in srgb, currentColor 14%, transparent);
}

.topic-toast.toast-error:not(.toast-theme-colored) {
    background: color-mix(in srgb, var(--ui-foundation-danger) 8%, var(--bg, #1a2332));
}

.topic-toast.toast-success:not(.toast-theme-colored) {
    background: color-mix(in srgb, var(--ui-foundation-success) 7%, var(--bg, #1a2332));
}

.ui-form-field,
.public-upload-shell .row > [class*="col-"],
.public-upload-shell .mb-4 {
    min-width: 0;
}

.ui-form-help,
.ui-form-error,
.upload-live-hint,
.upload-field-rules,
.upload-image-rules,
.form-text {
    line-height: 1.45;
}

.ui-form-help,
.upload-field-rules,
.upload-image-rules,
.form-text {
    color: var(--text-dim, #64748b);
}

.ui-form-error,
.is-invalid + .ui-form-error,
.public-upload-shell .is-invalid ~ .upload-live-hint {
    color: var(--ui-foundation-danger);
    font-weight: 800;
}

:where(.form-control, .form-select, .ui-admin-form-control, textarea, input, select).is-invalid,
:where(.form-control, .form-select, .ui-admin-form-control, textarea, input, select)[aria-invalid="true"] {
    border-color: var(--ui-foundation-danger) !important;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--ui-foundation-danger) 18%, transparent) !important;
}

.empty-state-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
}

.empty-state-action {
    min-width: 0;
    max-width: 100%;
    white-space: normal;
}

.topic-dl-card,
.download-card {
    min-height: 96px;
}

.topic-dl-button,
.download-btn {
    min-width: 150px;
    min-height: 38px;
}

.topic-dl-spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid color-mix(in srgb, currentColor 22%, transparent);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: ui-foundation-spin .75s linear infinite;
}

.topic-dl-card.is-counting .topic-dl-spinner {
    display: inline-block;
}

.topic-dl-card.is-counting {
    cursor: progress;
}

.topic-dl-card.is-ready {
    border-color: color-mix(in srgb, var(--ui-foundation-success) 38%, var(--border, #d8dee8));
}

.public-preview-grid {
    min-height: 0;
}

.public-preview-grid:not(:empty) {
    min-height: 116px;
}

.btn-submit-mod,
.btn-cancel-mod,
.upload-wizard-step {
    min-height: 42px;
}

.btn-submit-mod.is-submitting,
.is-ui-loading {
    cursor: progress !important;
}

.btn-submit-mod.is-submitting i,
.is-ui-loading i {
    animation: ui-foundation-spin .75s linear infinite;
}

.topic-comments .ui-comment-empty-state {
    min-height: 150px;
}

.topic-comments .ui-comment-action-btn,
.topic-comments .comment-reaction-btn,
.topic-comments .ui-comment-btn-submit,
.topic-comments .ui-comment-btn-cancel {
    min-height: 34px;
}

@keyframes ui-foundation-spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 640px) {
    .topic-toast {
        min-width: min(100%, 280px);
        max-width: calc(100vw - 24px);
    }

    .topic-dl-button,
    .download-btn {
        width: 100%;
    }
}