/* ==========================================================================
   Modern Survey Studio — Stylesheet
   Built with Google Chrome Modern Web Guidance patterns & responsible fallbacks
   ========================================================================== */

@property --fade-start {
  syntax: "<length>";
  inherits: false;
  initial-value: 0px;
}

@property --fade-end {
  syntax: "<length>";
  inherits: false;
  initial-value: 0px;
}

:root {
  /* Velvet Secret Chamber palette tokens (Parchment Rose Light & Obsidian Crimson Dark) */
  --bg-canvas-light: #f7f2f0;
  --bg-canvas-dark: #0e0a0e;

  --bg-surface-light: #fffdfd;
  --bg-surface-dark: #171118;

  --bg-elevated-light: #f0e6e4;
  --bg-elevated-dark: #231925;

  --bg-prose-light: #fbf7f5;
  --bg-prose-dark: #140e15;

  --fg-primary-light: #20161a;
  --fg-primary-dark: #f5edf0;

  --fg-secondary-light: #5c4950;
  --fg-secondary-dark: #c4b2ba;

  --fg-muted-light: #746068;
  --fg-muted-dark: #9c8891;

  --border-subtle-light: #dfd0d4;
  --border-subtle-dark: #38283b;

  --border-strong-light: #806870;
  --border-strong-dark: #967c9b;

  --accent-light: #9b1d39;
  --accent-dark: #ed6b86;

  --accent-contrast-light: #ffffff;
  --accent-contrast-dark: #1e070d;

  --accent-soft-light: #fce9ee;
  --accent-soft-dark: #351521;

  --success-light: #166534;
  --success-dark: #5dd38b;

  --success-soft-light: #e8f5ee;
  --success-soft-dark: #142c1f;

  --error-light: #b91c1c;
  --error-dark: #ff8080;

  --error-soft-light: #fdecec;
  --error-soft-dark: #341518;

  --scrollbar-track-light: #ebe6dc;
  --scrollbar-track-dark: #1b1920;
  --scrollbar-thumb-light: #726a60;
  --scrollbar-thumb-dark: #877f92;

  /* Fallback defaults for older browsers without light-dark() */
  --bg-canvas: var(--bg-canvas-light);
  --bg-surface: var(--bg-surface-light);
  --bg-elevated: var(--bg-elevated-light);
  --bg-prose: var(--bg-prose-light);
  --fg-primary: var(--fg-primary-light);
  --fg-secondary: var(--fg-secondary-light);
  --fg-muted: var(--fg-muted-light);
  --border-subtle: var(--border-subtle-light);
  --border-strong: var(--border-strong-light);
  --accent: var(--accent-light);
  --accent-contrast: var(--accent-contrast-light);
  --accent-soft: var(--accent-soft-light);
  --success: var(--success-light);
  --success-soft: var(--success-soft-light);
  --error: var(--error-light);
  --error-soft: var(--error-soft-light);
  --scrollbar-track: var(--scrollbar-track-light);
  --scrollbar-thumb: var(--scrollbar-thumb-light);

  @media (prefers-color-scheme: dark) {
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --bg-prose: var(--bg-prose-dark);
    --fg-primary: var(--fg-primary-dark);
    --fg-secondary: var(--fg-secondary-dark);
    --fg-muted: var(--fg-muted-dark);
    --border-subtle: var(--border-subtle-dark);
    --border-strong: var(--border-strong-dark);
    --accent: var(--accent-dark);
    --accent-contrast: var(--accent-contrast-dark);
    --accent-soft: var(--accent-soft-dark);
    --success: var(--success-dark);
    --success-soft: var(--success-soft-dark);
    --error: var(--error-dark);
    --error-soft: var(--error-soft-dark);
    --scrollbar-track: var(--scrollbar-track-dark);
    --scrollbar-thumb: var(--scrollbar-thumb-dark);
  }

  /* Map <meta name="color-scheme"> override back onto :root while keeping light dark default */
  color-scheme: light dark;

  &:has(> head > meta[name="color-scheme"][content="dark"]) {
    color-scheme: dark;
    --bg-canvas: var(--bg-canvas-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-elevated: var(--bg-elevated-dark);
    --bg-prose: var(--bg-prose-dark);
    --fg-primary: var(--fg-primary-dark);
    --fg-secondary: var(--fg-secondary-dark);
    --fg-muted: var(--fg-muted-dark);
    --border-subtle: var(--border-subtle-dark);
    --border-strong: var(--border-strong-dark);
    --accent: var(--accent-dark);
    --accent-contrast: var(--accent-contrast-dark);
    --accent-soft: var(--accent-soft-dark);
    --success: var(--success-dark);
    --success-soft: var(--success-soft-dark);
    --error: var(--error-dark);
    --error-soft: var(--error-soft-dark);
    --scrollbar-track: var(--scrollbar-track-dark);
    --scrollbar-thumb: var(--scrollbar-thumb-dark);
  }

  &:has(> head > meta[name="color-scheme"][content="light"]) {
    color-scheme: light;
    --bg-canvas: var(--bg-canvas-light);
    --bg-surface: var(--bg-surface-light);
    --bg-elevated: var(--bg-elevated-light);
    --bg-prose: var(--bg-prose-light);
    --fg-primary: var(--fg-primary-light);
    --fg-secondary: var(--fg-secondary-light);
    --fg-muted: var(--fg-muted-light);
    --border-subtle: var(--border-subtle-light);
    --border-strong: var(--border-strong-light);
    --accent: var(--accent-light);
    --accent-contrast: var(--accent-contrast-light);
    --accent-soft: var(--accent-soft-light);
    --success: var(--success-light);
    --success-soft: var(--success-soft-light);
    --error: var(--error-light);
    --error-soft: var(--error-soft-light);
    --scrollbar-track: var(--scrollbar-track-light);
    --scrollbar-thumb: var(--scrollbar-thumb-light);
  }

  @supports (color: light-dark(white, black)) {
    --bg-canvas: light-dark(var(--bg-canvas-light), var(--bg-canvas-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-elevated: light-dark(var(--bg-elevated-light), var(--bg-elevated-dark));
    --bg-prose: light-dark(var(--bg-prose-light), var(--bg-prose-dark));
    --fg-primary: light-dark(var(--fg-primary-light), var(--fg-primary-dark));
    --fg-secondary: light-dark(var(--fg-secondary-light), var(--fg-secondary-dark));
    --fg-muted: light-dark(var(--fg-muted-light), var(--fg-muted-dark));
    --border-subtle: light-dark(var(--border-subtle-light), var(--border-subtle-dark));
    --border-strong: light-dark(var(--border-strong-light), var(--border-strong-dark));
    --accent: light-dark(var(--accent-light), var(--accent-dark));
    --accent-contrast: light-dark(var(--accent-contrast-light), var(--accent-contrast-dark));
    --accent-soft: light-dark(var(--accent-soft-light), var(--accent-soft-dark));
    --success: light-dark(var(--success-light), var(--success-dark));
    --success-soft: light-dark(var(--success-soft-light), var(--success-soft-dark));
    --error: light-dark(var(--error-light), var(--error-dark));
    --error-soft: light-dark(var(--error-soft-light), var(--error-soft-dark));
    --scrollbar-track: light-dark(var(--scrollbar-track-light), var(--scrollbar-track-dark));
    --scrollbar-thumb: light-dark(var(--scrollbar-thumb-light), var(--scrollbar-thumb-dark));
  }

  --reading-scale: 1;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;

  accent-color: var(--accent);
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

@supports not (scrollbar-color: auto) {
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  ::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 999px;
  }
  ::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
  }
}

@media (forced-colors: active) {
  :root {
    --bg-canvas: Canvas;
    --bg-surface: Canvas;
    --bg-elevated: Canvas;
    --bg-prose: Canvas;
    --fg-primary: CanvasText;
    --fg-secondary: CanvasText;
    --fg-muted: GrayText;
    --border-subtle: CanvasText;
    --border-strong: CanvasText;
    --accent: Highlight;
    --accent-contrast: HighlightText;
  }
}

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

/* Preserve boolean `hidden` across custom flex/grid components while keeping hidden="until-found" searchable */
[hidden]:not([hidden="until-found"]) {
  display: none !important;
}

html {
  scroll-padding-block-start: 6.5rem;
}

body {
  margin: 0;
  background-color: var(--bg-canvas);
  color: var(--fg-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  text-align: start;
  overflow-wrap: break-word;
}

::selection {
  background-color: var(--accent);
  color: var(--accent-contrast);
}

/* Accessibility utility: visually hidden while remaining in AT tree */
.visually-hidden:where(:not(:focus-within, :active)) {
  position: absolute !important;
  clip-path: inset(50%) !important;
  overflow: hidden !important;
  width: 1px !important;
  height: 1px !important;
  margin: -1px !important;
  padding: 0 !important;
  border: 0 !important;
  white-space: nowrap !important;
}

.skip-link {
  position: absolute;
  inset-block-start: 0.5rem;
  inset-inline-start: 0.75rem;
  z-index: 999;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-contrast);
  text-decoration: none;
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* Visible keyboard focus across all interactive elements */
:is(a, button, input, select, textarea, [role="tab"], summary):focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ==========================================================================
   Directional View Transitions (SPA Navigation & Section Stepping)
   ========================================================================== */

@keyframes slide-to-left {
  to {
    transform: translateX(-6%);
    opacity: 0;
  }
}

@keyframes slide-from-right {
  from {
    transform: translateX(6%);
    opacity: 0;
  }
}

@keyframes slide-to-right {
  to {
    transform: translateX(6%);
    opacity: 0;
  }
}

@keyframes slide-from-left {
  from {
    transform: translateX(-6%);
    opacity: 0;
  }
}

::view-transition-group(root) {
  animation: 0.32s cubic-bezier(0.22, 1, 0.36, 1) both;
}

html:active-view-transition-type(forward)::view-transition-old(root) {
  animation-name: slide-to-left;
}

html:active-view-transition-type(forward)::view-transition-new(root) {
  animation-name: slide-from-right;
}

html:active-view-transition-type(backward)::view-transition-old(root) {
  animation-name: slide-to-right;
}

html:active-view-transition-type(backward)::view-transition-new(root) {
  animation-name: slide-from-left;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(root) {
    animation: none !important;
  }
}

/* ==========================================================================
   Header & Global Shell
   ========================================================================== */

.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 40;
  background-color: color-mix(in oklab, var(--bg-surface) 90%, transparent);
  backdrop-filter: blur(12px);
  border-block-end: 1px solid var(--border-subtle);
}

.header-inner {
  max-inline-size: 74rem;
  margin-inline: auto;
  padding-block: 0.75rem;
  padding-inline: clamp(1rem, 3vw, 2rem);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand-button {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 0.25rem 0.4rem;
  margin-inline-start: -0.4rem;
  border-radius: var(--radius-sm);
  color: inherit;
  font: inherit;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-block-size: 3rem;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  inline-size: 2.25rem;
  block-size: 2.25rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  font-size: 1.15rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.brand-title {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--fg-muted);
}

.brand-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.role-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  border: 1.5px solid var(--border-strong);
  background-color: var(--bg-elevated);
  color: var(--fg-primary);
}

.role-badge.is-daughter {
  border-color: var(--accent);
  background-color: var(--accent-soft);
  color: var(--accent);
}

.role-badge.is-father {
  border-color: var(--border-strong);
  background-color: var(--bg-elevated);
  color: var(--fg-primary);
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.main-shell {
  max-inline-size: 74rem;
  margin-inline: auto;
  padding-block: clamp(1.25rem, 3vw, 2.5rem) 5rem;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

/* ==========================================================================
   Buttons & Interactive Primitives (No fixed height; min-block-size >= 48px)
   ========================================================================== */

.btn {
  appearance: none;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.35;
  min-block-size: 3rem;
  padding-block: 0.6rem;
  padding-inline: 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background-color: var(--bg-surface);
  color: var(--fg-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

@media (pointer: coarse) {
  .btn {
    min-block-size: 3.25rem;
  }
}

.btn:hover:not(:disabled) {
  background-color: var(--bg-elevated);
}

.btn:active:not(:disabled) {
  transform: scale(0.985);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-compact {
  padding-block: 0.45rem;
  padding-inline: 0.85rem;
  font-size: 0.875rem;
}

.btn-icon {
  min-inline-size: 3rem;
  padding-inline: 0.65rem;
}

.btn-tiny {
  min-block-size: 2.25rem;
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
}

.btn-full {
  inline-size: 100%;
}

/* ==========================================================================
   View 0: Secret Chamber Identity Gate (`autofill-sign-in-form`)
   ========================================================================== */

.gate-hero {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.35rem, 3vw, 2.25rem);
  margin-block-end: 1.5rem;
}

.gate-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 1.35rem;
}

.gate-card {
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.35rem, 2.8vw, 1.85rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.35rem;
}

.gate-card-daughter {
  border-color: color-mix(in oklab, var(--accent) 55%, var(--border-subtle));
}

.gate-card-title {
  margin: 0.65rem 0 0.5rem;
  font-size: 1.4rem;
  line-height: 1.3;
}

.gate-feature-list {
  margin: 0.95rem 0 0;
  padding-inline-start: 1.2rem;
  color: var(--fg-secondary);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.father-signin-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-block-start: 0.95rem;
  border-block-start: 1px solid var(--border-subtle);
}

.pwd-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

/* Native Switch Control (`switch` guide) & Father Private Card Indicator */
.survey-card.is-father-private {
  border-style: dashed;
  border-width: 1.5px;
  border-color: var(--border-strong);
  background-color: color-mix(in oklab, var(--bg-elevated) 38%, var(--bg-surface));
}

.card-top-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.6rem;
  margin-block-end: 0.65rem;
}

.card-top-row .card-badges {
  margin-block-end: 0;
}

.chamber-switch-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.65rem;
  min-block-size: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background-color: var(--bg-canvas);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
}

.chamber-switch-label:has(input:checked) {
  border-color: var(--accent);
  background-color: var(--accent-soft);
  color: var(--accent);
}

input[type="checkbox"][switch] {
  accent-color: var(--accent);
  margin: 0;
  inline-size: 1.15rem;
  block-size: 1.15rem;
  cursor: pointer;
}

input[type="checkbox"][switch]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.search-row.is-daughter-mode {
  grid-template-columns: minmax(0, 1fr) auto;
}

@media (max-width: 46rem) {
  .search-row.is-daughter-mode {
    grid-template-columns: 1fr;
  }
}

.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.btn-primary:hover:not(:disabled) {
  background-color: color-mix(in oklab, var(--accent) 88%, black);
}

.btn-accent {
  background-color: var(--success);
  border-color: var(--success);
  color: #ffffff;
}

.btn-accent:hover:not(:disabled) {
  background-color: color-mix(in oklab, var(--success) 86%, black);
}

.btn-secondary {
  background-color: var(--bg-elevated);
  border-color: var(--border-strong);
  color: var(--fg-primary);
}

.btn-ghost {
  background-color: transparent;
  border-color: var(--border-subtle);
  color: var(--fg-secondary);
}

.btn-danger {
  background-color: var(--error);
  border-color: var(--error);
  color: #ffffff;
}

/* ==========================================================================
   View 1: Directory Hero, Search & Container-Queried Cards
   ========================================================================== */

.hero-banner {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2.25rem);
  margin-block-end: 1.75rem;
}

.eyebrow {
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.hero-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.45rem, 1.1rem + 1.6vw, 2.35rem);
  line-height: 1.25;
  text-wrap: balance;
}

.hero-desc {
  margin: 0 0 1.35rem;
  max-inline-size: 62ch;
  color: var(--fg-secondary);
  text-wrap: pretty;
}

.directory-search {
  display: block;
  padding-block-start: 1.15rem;
  border-block-start: 1px solid var(--border-subtle);
}

.search-row {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) auto;
  gap: 0.85rem;
  align-items: end;
}

@media (max-width: 46rem) {
  .search-row {
    grid-template-columns: 1fr;
  }
}

.survey-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 22rem), 1fr));
  gap: 1.25rem;
}

.survey-card-wrap {
  container-type: inline-size;
}

.survey-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.15rem;
  min-block-size: 100%;
  transition: border-color 0.2s ease;
}

.survey-card:hover {
  border-color: var(--border-strong);
}

.card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-block-end: 0.65rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding-block: 0.2rem;
  padding-inline: 0.6rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-elevated);
  color: var(--fg-secondary);
}

.badge-accent {
  background-color: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.badge-draft {
  background-color: var(--success-soft);
  border-color: var(--success);
  color: var(--success);
}

.card-title {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
  line-height: 1.35;
}

.card-subtitle {
  margin: 0 0 0.65rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--fg-muted);
}

.card-desc {
  margin: 0;
  font-size: 0.94rem;
  color: var(--fg-secondary);
  text-wrap: pretty;
}

.card-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  padding-block-start: 0.85rem;
  border-block-start: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

@container (min-width: 26rem) {
  .card-actions .btn-start-main {
    flex: 1 1 auto;
  }
}

/* ==========================================================================
   Form Controls, :user-invalid Validation, & field-sizing: content
   ========================================================================== */

.field {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.3rem;
}

.field label,
.question-legend {
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--fg-primary);
}

.req-badge {
  display: inline-block;
  margin-inline-start: 0.35rem;
  padding-inline: 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
}

.field-hint {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--fg-muted);
}

input[type="text"],
input[type="email"],
input[type="search"],
select,
textarea {
  font: inherit;
  font-size: max(1rem, 1em);
  line-height: 1.55;
  padding: 0.7rem 0.85rem;
  min-block-size: 3rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border-strong);
  background-color: var(--bg-surface);
  color: var(--fg-primary);
}

@media (pointer: coarse) {
  input[type="text"],
  input[type="email"],
  input[type="search"],
  select {
    min-block-size: 3.25rem;
  }
}

/* Auto-sizing textareas with stable inline width & bounded vertical growth */
textarea {
  field-sizing: content;
  height: auto;
  inline-size: 100%;
  min-block-size: 3.5lh;
  max-block-size: 14lh;
  resize: vertical;
}

select {
  field-sizing: content;
  inline-size: 100%;
  max-inline-size: 100%;
}

/* Fallback for browsers without field-sizing: content */
@supports not (field-sizing: content) {
  .growable-textarea {
    display: grid;
  }

  .growable-textarea::after,
  .growable-textarea > textarea {
    grid-area: 1 / 1 / 2 / 2;
    font: inherit;
    font-size: max(1rem, 1em);
    line-height: 1.55;
    padding: 0.7rem 0.85rem;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-sm);
  }

  .growable-textarea::after {
    content: attr(data-replicated-value) " ";
    white-space: pre-wrap;
    visibility: hidden;
    min-block-size: 5.5rem;
  }

  .growable-textarea > textarea {
    overflow-y: auto;
  }
}

.error-msg {
  display: none;
  margin-block-start: 0.25rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--error-soft);
  border-inline-start: 3px solid var(--error);
  color: var(--error);
  font-size: 0.875rem;
  font-weight: 600;
}

/* :is() keeps the rule intact if :user-invalid is unsupported in an older engine */
:is(:user-invalid, .user-invalid-fallback) {
  border-color: var(--error) !important;
  background-color: var(--error-soft);
}

:is(:user-invalid, .user-invalid-fallback) + .error-msg,
.growable-textarea:has(:is(:user-invalid, .user-invalid-fallback)) + .error-msg,
.question-card.has-group-error .error-msg {
  display: block;
}

input:is(:user-valid, .user-valid-fallback):not([type="search"], [type="radio"], [type="checkbox"]),
textarea:is(:user-valid, .user-valid-fallback) {
  border-color: var(--success);
}

/* ==========================================================================
   Native <progress> Bar (Separate -webkit- and -moz- pseudo-element rules)
   ========================================================================== */

progress.modern-progress {
  appearance: none;
  border: 0 solid;
  overflow: clip;
  display: block;
  inline-size: 100%;
  block-size: 0.45rem;
  container-type: inline-size;
  --progress-bar-radius: 1e5px;
  --progress-bar-track: var(--bg-elevated);
  --progress-bar-fill: var(--accent);
  --progress-bar-indeterminate-size: 30%;
  --progress-bar-indeterminate-animation-duration: 1.5s;
  border-radius: var(--progress-bar-radius);
  background: var(--progress-bar-track);

  @media (prefers-reduced-motion: reduce) {
    --progress-bar-indeterminate-animation-duration: 10s;
  }
}

progress.modern-progress:dir(rtl) {
  --progress-bar-indeterminate-animation: progress-bar-indeterminate var(--progress-bar-indeterminate-animation-duration) infinite linear reverse;
}

progress.modern-progress:indeterminate {
  --progress-bar-animation: var(
    --progress-bar-indeterminate-animation,
    progress-bar-indeterminate var(--progress-bar-indeterminate-animation-duration) infinite linear
  );
}

progress.modern-progress::-webkit-progress-bar {
  background: transparent;
}

progress.modern-progress::-webkit-progress-value {
  background: var(--progress-bar-fill);
  border-radius: var(--progress-bar-radius);
  transition: inline-size 0.3s ease;
  animation: var(--progress-bar-animation, revert-rule);
}

progress.modern-progress::-moz-progress-bar {
  background: var(--progress-bar-fill);
  border-radius: var(--progress-bar-radius);
  transition: inline-size 0.3s ease;
  animation: var(--progress-bar-animation, revert-rule);
}

@keyframes progress-bar-indeterminate {
  from,
  to {
    inline-size: var(--progress-bar-indeterminate-size);
    margin-right: auto;
  }
  from {
    translate: -100%;
  }
  to {
    translate: 100cqi;
  }
}

/* ==========================================================================
   Horizontal Scroller with Scroll-Driven Edge Fades & Fallback
   ========================================================================== */

.scroller {
  overflow-x: auto;
  scrollbar-width: none;
  --fade-size: 2.5rem;
  --fade-dir: right;
  --fade-start-pos: 0;
  --fade-end-pos: 100%;
  scroll-padding-inline: var(--fade-size);
  mask:
    linear-gradient(black, black) no-clip subtract,
    linear-gradient(to var(--fade-dir), black, transparent) var(--fade-start-pos) 0 / var(--fade-start) 100% no-repeat no-clip,
    linear-gradient(to var(--fade-dir), transparent, black) var(--fade-end-pos) 0 / var(--fade-end) 100% no-repeat no-clip;

  &:dir(rtl) {
    --fade-dir: left;
    --fade-start-pos: 100%;
    --fade-end-pos: 0;
  }
}

.scroller::-webkit-scrollbar {
  display: none;
}

@supports (animation-timeline: scroll(self inline)) {
  .scroller {
    animation: reveal-fade-start linear both, hide-fade-end linear both;
    animation-timeline: scroll(self inline);
    animation-range: 0 var(--fade-size), calc(100% - var(--fade-size)) 100%;
  }
}

@supports not (animation-timeline: scroll(self inline)) {
  .scroller {
    transition: --fade-start 0.2s, --fade-end 0.2s;
  }
  .scroller.more-start {
    --fade-start: var(--fade-size);
  }
  .scroller.more-end {
    --fade-end: var(--fade-size);
  }
}

@keyframes reveal-fade-start {
  to {
    --fade-start: var(--fade-size);
  }
}

@keyframes hide-fade-end {
  from {
    --fade-end: var(--fade-size);
  }
}

/* ==========================================================================
   View 2: Immersive Survey Runner
   ========================================================================== */

#view-runner {
  max-inline-size: 52rem;
  margin-inline: auto;
}

.runner-sticky-bar {
  position: sticky;
  inset-block-start: 4.55rem;
  z-index: 30;
  background-color: color-mix(in oklab, var(--bg-surface) 94%, transparent);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  margin-block-end: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.runner-bar-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.runner-progress-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.86rem;
}

.progress-text {
  font-weight: 700;
}

.draft-pill {
  font-size: 0.78rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background-color: var(--bg-elevated);
  color: var(--fg-muted);
  border: 1px solid var(--border-subtle);
}

.runner-bar-tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.runner-header {
  margin-block-end: 1.25rem;
}

.runner-main-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.35rem, 1.05rem + 1.3vw, 2rem);
  line-height: 1.3;
  text-wrap: balance;
}

.runner-lead {
  margin: 0;
  max-inline-size: 62ch;
  color: var(--fg-secondary);
  text-wrap: pretty;
}

/* Multi-step tracker */
.step-nav-wrap {
  margin-block-end: 1.5rem;
}

.step-tracker {
  list-style: none;
  margin: 0;
  padding: 0.25rem 0;
  display: flex;
  gap: 0.5rem;
  scroll-snap-type: inline proximity;
}

.step-tracker li {
  flex: none;
  scroll-snap-align: start;
}

.step-pill-btn {
  appearance: none;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  min-block-size: 2.75rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1.5px solid var(--border-subtle);
  background-color: var(--bg-surface);
  color: var(--fg-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.step-pill-btn[aria-current="step"] {
  border-color: var(--accent);
  background-color: var(--accent-soft);
  color: var(--accent);
}

.step-pill-btn.is-complete:not([aria-current="step"]) {
  border-color: var(--success);
  color: var(--success);
}

.meta-card {
  margin: 0 0 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}

.meta-legend {
  padding-inline: 0.45rem;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--fg-secondary);
}

.meta-fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
}

.meta-fields-grid > .field {
  grid-row: span 3;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-rows: subgrid;
  gap: 0.3rem;
}

/* Survey Section & Blocks */
.survey-section {
  margin-block-end: 2rem;
}

.section-banner {
  margin-block-end: 1.25rem;
  padding-block-end: 0.75rem;
  border-block-end: 2px solid var(--border-subtle);
}

.section-heading {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.35;
}

.section-heading:focus {
  outline: none;
}

.section-intro {
  margin: 0.4rem 0 0;
  color: var(--fg-secondary);
  font-size: 0.95rem;
}

.subhead-divider {
  margin: 1.75rem 0 0.85rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.03em;
}

/* Literary Narrative Prose Block */
.prose-block {
  background-color: var(--bg-prose);
  border: 1px solid var(--border-subtle);
  border-inline-start: 3.5px solid var(--accent);
  border-radius: var(--radius-md);
  padding: clamp(1.1rem, 2.5vw, 1.65rem);
  margin-block: 1.15rem;
}

.prose-block p {
  margin: 0;
  max-inline-size: 62ch;
  font-family: var(--font-serif);
  font-size: calc(1.06rem * var(--reading-scale));
  line-height: 1.88;
  color: var(--fg-primary);
  text-wrap: pretty;
}

.prose-block p + p {
  margin-block-start: 1.05em;
}

/* Question Card */
.question-card {
  margin: 1.15rem 0;
  padding: clamp(1rem, 2.2vw, 1.4rem);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-subtle);
  background-color: var(--bg-surface);
  transition: border-color 0.2s ease;
}

.question-card.is-answered {
  border-color: color-mix(in oklab, var(--success) 55%, var(--border-subtle));
}

.question-fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  min-inline-size: 0;
}

.question-legend {
  padding: 0;
  margin-block-end: 0.75rem;
  display: block;
  inline-size: 100%;
}

/* Radio & Checkbox Stacks (Input followed immediately by Label, >=48px target) */
.choice-stack {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.choice-row {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.7rem 0.9rem;
  min-block-size: 3rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border-subtle);
  background-color: var(--bg-canvas);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.choice-row:hover {
  border-color: var(--border-strong);
}

.choice-row:has(input:checked) {
  border-color: var(--accent);
  background-color: var(--accent-soft);
}

.choice-row input[type="radio"],
.choice-row input[type="checkbox"] {
  flex: none;
  inline-size: 1.2rem;
  block-size: 1.2rem;
  margin: 0.2rem 0 0;
  cursor: pointer;
}

.choice-row label {
  flex: 1;
  cursor: pointer;
  font-weight: 500;
  line-height: 1.45;
  /* Expand tap area across row padding */
  padding-block: 0.55rem;
  margin-block: -0.55rem;
}

.choice-main {
  display: block;
  font-weight: 600;
}

.choice-sub {
  display: block;
  font-size: 0.82rem;
  color: var(--fg-muted);
}

/* Horizontal Rating Strip */
.rating-strip,
.choice-inline-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.choice-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.9rem;
  min-block-size: 3rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border-subtle);
  background-color: var(--bg-canvas);
}

.choice-pill:has(input:checked) {
  border-color: var(--accent);
  background-color: var(--accent-soft);
}

.choice-pill label {
  cursor: pointer;
  font-weight: 600;
}

.runner-footer-bar {
  margin-block-start: 2rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.runner-footer-right {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.step-counter-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg-muted);
}

/* ==========================================================================
   View 3: Analytics, Accessible Tabs & Pre/Post Ladder Comparison
   ========================================================================== */

.analytics-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-block-end: 1.25rem;
}

.analytics-topbar-right {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.analytics-header {
  margin-block-end: 1.5rem;
}

.kpi-grid {
  margin-block-start: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
  gap: 0.85rem;
}

.kpi-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
}

.kpi-label {
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.kpi-value {
  margin-block-start: 0.25rem;
  font-size: 1.55rem;
  font-weight: 800;
}

/* Accessible Tabs per `tabs` guide */
.tabs-component {
  margin-block-start: 1rem;
}

.tablist {
  display: flex;
  gap: 0.25rem;
  border-block-end: 1px solid var(--border-subtle);
  scroll-snap-type: inline proximity;
}

[role="tab"] {
  position: relative;
  flex: none;
  scroll-snap-align: start;
  appearance: none;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--fg-secondary);
  padding: 0.8rem 1.1rem;
  min-block-size: 3rem;
  cursor: pointer;
}

[role="tab"]:hover {
  color: var(--fg-primary);
}

/* Styled strictly from aria-selected with a border pseudo-element (safe in Forced Colors) */
[role="tab"][aria-selected="true"] {
  color: var(--accent);

  &::after {
    content: "";
    position: absolute;
    inset: auto 0 0;
    border-block-end: 3px solid var(--accent);
  }
}

/* Tabpanels share a grid cell; zero padding/border/margin on [role="tabpanel"] itself
   so hidden="until-found" never leaves an empty strip */
.tabpanels-stack {
  display: grid;
}

[role="tabpanel"] {
  grid-area: 1 / 1;
}

.tabpanel-inner {
  padding-block-start: 1.35rem;
}

/* Pre/Post Shift Comparison Cards */
.prepost-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
  margin-block-end: 1.15rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.prepost-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.prepost-card {
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
}

.prepost-card.is-held-line {
  border-color: var(--success);
  background-color: color-mix(in oklab, var(--success-soft) 45%, var(--bg-surface));
}

.prepost-card-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-block-end: 0.85rem;
}

.prepost-prompt {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
}

.shift-pill {
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid var(--border-strong);
}

.shift-pill.shift-up {
  background-color: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.shift-pill.shift-hold {
  background-color: var(--success-soft);
  border-color: var(--success);
  color: var(--success);
}

.ladder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 10rem), 1fr));
  gap: 0.5rem;
}

.ladder-step {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border-subtle);
  background-color: var(--bg-canvas);
  font-size: 0.86rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.ladder-step.is-pre {
  border-style: solid;
  border-width: 1.5px;
  border-color: var(--border-strong);
}

.ladder-step.is-post {
  border-style: solid;
  border-width: 2px;
  border-color: var(--accent);
  background-color: var(--accent-soft);
}

.ladder-step.is-pre.is-post {
  border-color: var(--success);
  background-color: var(--success-soft);
}

.step-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  font-size: 0.74rem;
  font-weight: 700;
}

/* Distribution Bars & Open Text Feed */
.stat-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  margin-block-end: 0.9rem;
}

.dist-row {
  margin-block-start: 0.65rem;
}

.dist-label-line {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.9rem;
  margin-block-end: 0.25rem;
}

.dist-bar-track {
  block-size: 0.65rem;
  border-radius: 999px;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  overflow: clip;
}

.dist-bar-fill {
  block-size: 100%;
  background-color: var(--accent);
  border-radius: 999px;
}

.open-entry-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.open-entry-item {
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-prose);
  border-inline-start: 3px solid var(--accent);
}

.open-entry-meta {
  font-size: 0.78rem;
  color: var(--fg-muted);
  margin-block-end: 0.25rem;
}

.response-table-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.response-item-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
}

/* ==========================================================================
   Native Modal <dialog> (Overscroll containment & scoped [open] display)
   ========================================================================== */

dialog {
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background-color: var(--bg-surface);
  color: var(--fg-primary);
  max-inline-size: min(36rem, calc(100dvw - 1.5rem));
  inline-size: 100%;
  max-block-size: calc(100dvh - 2rem);
}

dialog.dialog-wide {
  max-inline-size: min(56rem, calc(100dvw - 1.5rem));
}

/* Scoped strictly to dialog[open] so closed state is never overridden */
dialog[open] {
  display: flex;
  flex-direction: column;
}

/* Mandatory scroll containment per `dialog` guide (no body overflow:hidden) */
dialog:modal {
  overscroll-behavior: contain;
}

dialog::backdrop {
  background-color: rgb(0 0 0 / 0.58);
  backdrop-filter: blur(3px);
  overflow: hidden;
  overscroll-behavior: contain;
}

.dialog-surface {
  display: flex;
  flex-direction: column;
  max-block-size: calc(100dvh - 2rem);
}

.dialog-header {
  padding: 1.1rem 1.35rem;
  border-block-end: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.dialog-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.dialog-body {
  padding: 1.25rem 1.35rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.dialog-footer {
  padding: 0.95rem 1.35rem;
  border-block-start: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.6rem;
}

.settings-group {
  margin: 0;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.settings-group legend {
  padding-inline: 0.4rem;
  font-weight: 700;
}

/* Builder Modal Layout */
.builder-meta-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0.9rem;
}

@media (max-width: 40rem) {
  .builder-meta-grid {
    grid-template-columns: 1fr;
  }
}

.builder-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-block-end: 0.75rem;
}

.file-upload-label {
  cursor: pointer;
}

.visual-sections-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-block-end: 1rem;
}

.visual-sec-box {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-subtle);
  background-color: var(--bg-canvas);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.visual-q-box {
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

/* Transcript Viewer */
.transcript-actions-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-block-end: 0.85rem;
  border-block-end: 1px solid var(--border-subtle);
}

.transcript-article {
  font-family: var(--font-serif);
  line-height: 1.85;
  max-inline-size: 62ch;
}

.transcript-article h3 {
  margin: 1.5rem 0 0.65rem;
  font-family: var(--font-sans);
  color: var(--accent);
}

.transcript-qa-box {
  margin-block: 0.95rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
  border-inline-start: 4px solid var(--accent);
  font-family: var(--font-sans);
}

.transcript-qa-q {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--fg-secondary);
}

.transcript-qa-a {
  margin-block-start: 0.3rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--fg-primary);
}

/* ==========================================================================
   Persistent Manual Popover Toasts (`persistent-toast-notifications` guide)
   ========================================================================== */

.toast-stack[popover] {
  position: fixed;
  inset: auto 1rem 1rem auto;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  width: min(24rem, calc(100dvw - 2rem));
  flex-direction: column;
  gap: 0.55rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.22s ease, display 0.22s ease;
  transition-behavior: allow-discrete;
}

.toast-stack[popover]:is(:popover-open, .\:popover-open) {
  display: flex;
  opacity: 1;
}

.toast-item {
  padding: 0.8rem 1rem;
  inline-size: 100%;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-strong);
  background-color: var(--bg-surface);
  color: var(--fg-primary);
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.22s ease, transform 0.22s ease;

  @starting-style {
    opacity: 0;
    transform: translateY(0.5rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .toast-item {
    transition: none;
  }
}

.toast-msg {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
}

.toast-close {
  flex: none;
  min-block-size: 2.5rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.82rem;
}

/* Print layout for clean transcript archiving */
@media print {
  .site-header,
  .runner-sticky-bar,
  .runner-footer-bar,
  .transcript-actions-bar,
  .dialog-footer,
  .toast-stack {
    display: none !important;
  }

  body,
  dialog {
    background: #ffffff !important;
    color: #000000 !important;
    max-block-size: none !important;
    border: 0 !important;
  }
}