/* ============================================================
Zabon v2 — Stage 15 stylesheet (mobile-first app shell)
Language-agnostic visual system.
Rules enforced in this file:
No language-specific selectors.
No [lang="..."], :lang(...), or [data-lang="..."] styling.
All language content shares the same component styles.
Direction is functional only, via dir attributes and logical CSS.
Dark mode and font mode affect global variables only.
============================================================ */
/* ------------------------------------------------------------
Theme variables
------------------------------------------------------------ */
:root {
  --bg: #f6f2e9;
  --surface: #fffdf8;
  --surface-2: #f0ead9;
  --text: #26221c;
  --muted: #6f6759;
  --line: #ddd2c2;
  --accent: #2f6f4f;
  --accent-contrast: #ffffff;
  --danger: #a64b42;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.16);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --space-1: 0.35rem;
  --space-2: 0.55rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  /* Stage 15: comfortable, book-like reading spacing. */
  --reading-gap: 0.45rem;
  --toolbar-height: 3.5rem;
  --bottombar-height: 3.75rem;
  /* Stage 15: modern multilingual stacks (loaded via Google Fonts).
  The order matters: English first (Inter), then Farsi (Vazirmatn),
  then Thai (Prompt / Noto Serif Thai), then generic fallbacks. */
  --font-primary:
    "Inter", "Vazirmatn", "Prompt", system-ui, -apple-system, sans-serif;
  --font-modern: var(--font-primary);
  --font-traditional: "Inter", "Vazirmatn", "Noto Serif Thai", Georgia, serif;
  --content-font: var(--font-modern);

  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --actionbar-height: 3rem;

  color-scheme: light dark;
}

/* ------------------------------------------------------------
Font mode: changes only the global content font stack.
------------------------------------------------------------ */
:root[data-font="modern"] {
  --content-font: var(--font-modern);
}
:root[data-font="traditional"] {
  --content-font: var(--font-traditional);
}

/* ------------------------------------------------------------
Dark mode: changes semantic color variables only.
Stage 15: modern neutral near-black scheme with a cool accent.
------------------------------------------------------------ */
:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --surface: #141416;
  --surface-2: #1c1c1f;
  --text: #e8e8ea;
  --muted: #9b9ba2;
  --line: #2a2a2e;
  --accent: #6fd0e0;
  --accent-contrast: #0a0a0a;
  --danger: #e0847c;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0a0a;
    --surface: #141416;
    --surface-2: #1c1c1f;
    --text: #e8e8ea;
    --muted: #9b9ba2;
    --line: #2a2a2e;
    --accent: #6fd0e0;
    --accent-contrast: #0a0a0a;
    --danger: #e0847c;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

/* ------------------------------------------------------------
Base
------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  min-block-size: 100%;
}
body {
  font-family: var(--content-font);
  background: var(--bg);
  color: var(--text);
  font-weight: 400;
  /* Stage 15: slightly increased line height accommodates Thai tone
  marks and Farsi diacritics. */
  line-height: 1.6;
}
button,
select,
input {
  font: inherit;
  color: inherit;
}
[hidden] {
  display: none !important;
}
:where(button, select, input):focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ------------------------------------------------------------
App shell — mobile-first fixed toolbar / scrollable main /
fixed bottom bars.
------------------------------------------------------------ */
.app-shell {
  display: flex;
  flex-direction: column;
  block-size: 100dvh;
  overflow: hidden;
}
.app-toolbar {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  block-size: var(--toolbar-height);
  padding-inline: var(--space-3);
  background: var(--surface);
  border-block-end: 1px solid var(--line);
}
.app-toolbar__title {
  margin: 0;
  font-size: 1.25rem;
}
.toolbar__title[role="button"] {
  transition:
    opacity 0.2s ease,
    text-decoration 0.2s ease;
}
.toolbar__title[role="button"]:hover,
.toolbar__title[role="button"]:focus {
  opacity: 0.75;
  text-decoration: underline;
  outline: none; /* Rely on your global focus styles if preferred */
}
.app-main {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-block-start: var(--toolbar-height);
  padding-block-end: var(--safe-bottom);
}
/* ── Toolbars Base ── */
.action-bar,
.bottom-bar {
  position: fixed;
  inset-inline: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  background: var(--surface);
  border-block-start: 1px solid var(--line);
  box-sizing: border-box;
  width: 100%;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
}

/* Row 1: Exercises */
.action-bar {
  inset-block-end: var(--bottombar-height);
  justify-content: safe center;
  overflow-x: auto; /* Allows horizontal scroll on very small screens instead of wrapping */
}

/* Row 2: Media, Score & Settings */
.bottom-bar {
  inset-block-end: 0;
  min-block-size: var(--bottombar-height);
  justify-content: flex-start;
  overflow-x: auto; /* Allows horizontal scroll on very small screens instead of wrapping */
  padding-bottom: calc(var(--space-2) + var(--safe-bottom));
}

/* ── Toolbar Buttons ── */
.action-bar__button,
.bottom-bar__button,
.action-bar button,
.bottom-bar button {
  flex: 0 1 auto;
  min-block-size: 2.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  padding: 0.45rem 0.75rem;
  white-space: nowrap;
}

.action-bar__button:hover:not(:disabled),
.bottom-bar__button:hover:not(:disabled),
.action-bar button:hover:not(:disabled),
.bottom-bar button:hover:not(:disabled) {
  border-color: var(--accent);
}

.action-bar__button:disabled,
.bottom-bar__button:disabled,
.action-bar button:disabled,
.bottom-bar button:disabled {
  cursor: default;
  opacity: 0.45;
}

/* ── Row 1: Score Badge (Styled as an Exercise Icon) ── */
.auto-complete-progress {
  /* Inherits pill shape, padding, and border from .action-bar__button */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--accent);
  background: var(--surface-2, rgba(0, 0, 0, 0.05));
  cursor: default;
  pointer-events: none; /* Prevents it from acting like a clickable button */
  white-space: nowrap;
  min-width: 3.5rem;
}
.auto-complete-progress {
  /* Inherits pill shape from .action-bar__button */
  transition:
    background 0.3s ease,
    border-color 0.3s ease,
    color 0.3s ease;
  cursor: default;
  pointer-events: none;
}
/* ── Score Pill: Goal Met State (80%+) ── */
.auto-complete-progress.score-met {
  background: color-mix(in srgb, var(--success, #22c55e) 15%, var(--surface));
  border-color: var(--success, #22c55e);
  color: var(--success, #22c55e);
  font-weight: 600;
  /* Optional: Add a subtle pulse animation to draw the eye */
  animation: scoreMetPulse 2s infinite;
}

@keyframes scoreMetPulse {
  0% {
    box-shadow: 0 0 0 0
      color-mix(in srgb, var(--success, #22c55e) 40%, transparent);
  }
  70% {
    box-shadow: 0 0 0 6px
      color-mix(in srgb, var(--success, #22c55e) 0%, transparent);
  }
  100% {
    box-shadow: 0 0 0 0
      color-mix(in srgb, var(--success, #22c55e) 0%, transparent);
  }
}

/* ── Row 2: Complete Toggle & Settings Alignment ── */
.complete-toggle {
  margin-inline-start: auto; /* Absorbs space between [Stop] and [Complete], pushing them to the right */
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}

.complete-toggle input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}
/* ------------------------------------------------------------
Views
Stage 15: inline-size can never exceed the viewport.
------------------------------------------------------------ */
.view {
  inline-size: min(920px, 100%);
  max-inline-size: 100%;
  margin-inline: auto;
  padding-inline: 1rem;
  /*  padding-block: 1.25rem 5rem; */
  padding-block: 1.25rem calc(var(--safe-bottom) + 2rem);
}
#home-view,
#lesson-view {
  /* room for action bar + bottom bar 
  padding-block-end: 9.5rem; */
  padding-block-end: calc(
    var(--bottombar-height) + var(--actionbar-height) + var(--safe-bottom) +
      2rem
  );
}

/* ------------------------------------------------------------
Icon buttons (toolbar, bottom bar, close)
------------------------------------------------------------ */
.icon-button {
  inline-size: 2.4rem;
  block-size: 2.4rem;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  font-size: 1.05rem;
  cursor: pointer;
}
.icon-button:hover:not(:disabled) {
  border-color: var(--accent);
}
.icon-button:disabled {
  cursor: default;
  opacity: 0.45;
}
.icon-button--large {
  inline-size: 2.9rem;
  block-size: 2.9rem;
  font-size: 1.15rem;
}

/* ------------------------------------------------------------
Buttons
------------------------------------------------------------ */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 2.4rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
}
.button:disabled {
  cursor: default;
  opacity: 0.45;
}
.button--wide {
  inline-size: auto;
  min-block-size: 2.4rem;
}
.button:hover:not(:disabled) {
  border-color: var(--accent);
}
.button--icon {
  inline-size: 2.4rem;
  block-size: 2.4rem;
  padding: 0;
  border-radius: 50%;
  flex: 0 0 auto;
}
.button,
.icon-button,
.action-bar__button,
.bottom-bar__button {
  min-block-size: 2.5rem; /* 40px minimum touch target for mobile */
  /* ... keep your existing padding, borders, etc. ... */
}

/* ------------------------------------------------------------
Backdrop + hamburger panel
------------------------------------------------------------ */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(0, 0, 0, 0.32);
}
.hamburger-panel {
  position: fixed;
  inset-block-start: var(--toolbar-height);
  inset-inline-end: var(--space-3);
  z-index: 50;
  display: grid;
  gap: var(--space-3);
  inline-size: min(320px, calc(100vw - 1.5rem));
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.panel-row {
  display: grid;
  gap: var(--space-2);
}
.panel-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  inline-size: 100%;
  min-block-size: 2.6rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-align: start;
}
.panel-toggle:hover {
  border-color: var(--accent);
}
.panel-toggle__icon {
  inline-size: 2rem;
  text-align: center;
  font-size: 1.1rem;
}
.panel-toggle__label {
  unicode-bidi: isolate;
}
.panel-field {
  display: grid;
  gap: var(--space-2);
}
.panel-field__label {
  color: var(--muted);
  font-size: 0.9rem;
}
.panel-nav {
  display: grid;
  gap: var(--space-2);
  border-block-start: 1px solid var(--line);
  padding-block-start: var(--space-3);
}
.panel-nav__button {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  inline-size: 100%;
  min-block-size: 2.6rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-align: start;
}
.panel-nav__button:hover {
  border-color: var(--accent);
}

/* ------------------------------------------------------------
Settings sheet (bottom sheet)
Stage 15: sections never extend beyond the viewport width.
------------------------------------------------------------ */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 60;
}
.sheet__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.32);
}
.sheet__panel {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  display: flex;
  flex-direction: column;
  max-block-size: 82dvh;
  max-inline-size: 100%;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-block-end: 1px solid var(--line);
}
.sheet__title {
  margin: 0;
  font-size: 1.1rem;
}
.sheet__body {
  overflow-y: auto;
  padding: var(--space-4);
  display: grid;
  gap: var(--space-4);
}
.sheet-section {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  /* Stage 15: keep long content inside the viewport. */
  min-inline-size: 0;
  max-inline-size: 100%;
  overflow-wrap: anywhere;
}
.sheet-section__title {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}
.sheet-field {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ------------------------------------------------------------
Controls
------------------------------------------------------------ */
.select,
.text-input {
  min-block-size: 2.2rem;
  max-inline-size: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  padding: 0.45rem 0.7rem;
}
.language-list,
.voice-list,
.radio-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.language-control {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-block-size: 2.2rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
}
.language-control input {
  accent-color: var(--accent);
}
.language-control__flag {
  font-size: 1.05rem;
}
.language-control__label {
  unicode-bidi: isolate;
}
.radio-control {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-block-size: 2.2rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
}
.radio-control input {
  accent-color: var(--accent);
}
.voice-row {
  display: grid;
  gap: var(--space-1);
  inline-size: 100%;
  max-inline-size: 100%;
  min-inline-size: 0;
}
.voice-row__label {
  color: var(--muted);
  font-size: 0.85rem;
  unicode-bidi: isolate;
  /* Stage 15: long voice/language labels must wrap, not overflow. */
  overflow-wrap: anywhere;
}
/* Stage 15: voice selects never exceed the sheet width; long voice
names are truncated instead of pushing the layout off-screen. */
.voice-row .select {
  inline-size: 100%;
  min-inline-size: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.voice-instructions summary {
  cursor: pointer;
  unicode-bidi: isolate;
}
.voice-instructions__steps {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-2) 0 0;
  padding-inline-start: 1.4rem;
}
.voice-instructions__steps li {
  unicode-bidi: isolate;
}

/* ------------------------------------------------------------
Home view — categories
------------------------------------------------------------ */
.home-title {
  margin: 0 0 1rem;
  font-size: 1.2rem;
}
.category-list {
  display: grid;
  gap: 0.9rem;
}
.category {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  overflow: hidden;
}
.category__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  inline-size: 100%;
  padding: 1rem 1.1rem;
  border: 0;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  text-align: start;
  cursor: pointer;
}
.category__header:hover {
  color: var(--accent);
}
.category__title {
  unicode-bidi: isolate;
}
.category__chevron {
  color: var(--muted);
}
.category__lessons {
  display: grid;
  gap: var(--space-2);
  padding: 0 var(--space-3) var(--space-3);
}
.category__icon,
.proficiency-tier__icon {
  flex: 0 0 auto;
}
.category__title-group,
.proficiency-tier__title-group {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.category__progress {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 400;
}
.panel-nav__icon {
  inline-size: 2rem;
  text-align: center;
  font-size: 1.1rem;
}
.lesson-card {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: flex-start;
  inline-size: 100%;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 1rem;
  text-align: start;
  cursor: pointer;
}
.lesson-card:hover:not(:disabled) {
  border-color: var(--accent);
}
.lesson-card__title {
  flex: 1;
  min-inline-size: 0;
  unicode-bidi: isolate;
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------
Document header (lesson / exercise / progress)
------------------------------------------------------------ */
.document-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-block-end: 1rem;
}
.document-title {
  margin: 0;
  font-size: 1.2rem;
}

/* ------------------------------------------------------------
Lesson view — stacked language columns.
------------------------------------------------------------ */
.lesson-section {
  margin-block-end: 1.25rem;
}
.lesson-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  inline-size: 100%;
  padding: 0.35rem 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 1rem;
  text-align: start;
  cursor: pointer;
}
.lesson-section__header:hover {
  color: var(--accent);
}
.lesson-section__title {
  unicode-bidi: isolate;
}
.lesson-section__chevron {
  color: var(--muted);
}
.lesson-section__body {
  margin-block-start: 0.5rem;
}
.item-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  inline-size: 100%;
  max-inline-size: 100%;
  min-inline-size: 0;
}
.item-column {
  display: flex;
  flex-direction: column;
  flex: 0 0 auto;
  max-inline-size: 100%;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
.language-cell {
  display: grid;
  gap: 0.25rem;
  padding: 0.4rem 0.45rem;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.7;
  text-align: start;
  cursor: pointer;
}
.language-cell:hover:not(.language-cell--missing) {
  background-color: rgba(127, 127, 127, 0.1);
  background-color: color-mix(in srgb, var(--accent) 12%, transparent);
}
.language-cell__text {
  min-inline-size: 0;
  unicode-bidi: isolate;
  text-align: start;
  overflow-wrap: anywhere;
}
.language-cell--missing {
  opacity: 0.58;
  cursor: default;
}
.sentence-text {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
}
.sentence-token {
  display: inline;
  padding: 0.1rem 0.2rem;
  border-radius: var(--radius-sm);
  unicode-bidi: isolate;
}
.sentence-text--compact {
  gap: 0;
}
.sentence-text--compact .sentence-token {
  padding-inline: 0;
}
.language-cell.is-speaking {
  background-color: rgba(127, 127, 127, 0.16);
  background-color: color-mix(in srgb, var(--accent) 18%, transparent);
}
.sentence-token.is-highlighted {
  background-color: Highlight;
  color: HighlightText;
}
.language-line.is-speaking {
  border-color: var(--accent);
  background-color: rgba(127, 127, 127, 0.16);
  background-color: color-mix(in srgb, var(--accent) 18%, transparent);
}
.language-cell__word-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.record-mic-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1;
  cursor: pointer;
  flex: 0 0 auto;
  flex-shrink: 0;
  transition:
    border-color 0.2s,
    color 0.2s;
}
.record-mic-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ------------------------------------------------------------
Record Overlay Visual States (Stage 9)
------------------------------------------------------------ */
.record-overlay__btn[data-action="record-stop"] {
  background-color: var(--surface);
  color: var(--danger);
  border-color: var(--danger);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.record-overlay__btn[data-action="record-stop"]::before {
  content: "";
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  background-color: var(--danger);
  border-radius: 50%;
  margin-inline-end: 0.5rem;
  animation: pulse-dot 1s infinite;
}
@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.8);
  }
}
.record-overlay__error {
  color: var(--danger);
  font-size: 0.9rem;
  text-align: center;
  margin: var(--space-3) 0 0 0;
  font-weight: 500;
  line-height: 1.4;
}

/* ------------------------------------------------------------
Shared components
------------------------------------------------------------ */
.empty-state {
  padding: 1rem;
  border: 1px dashed var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--muted);
  text-align: start;
}
.flashcard-stage,
.quiz-stage,
.build-stage {
  display: grid;
  gap: 1rem;
}
.flashcard {
  display: grid;
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}
.flashcard__back {
  display: grid;
  gap: 0.55rem;
  padding: 0.75rem;
  border: 1px dashed var(--line);
  border-radius: 14px;
}
.flashcard__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.rating-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.flashcard-status,
.quiz-status {
  color: var(--muted);
  font-size: 0.95rem;
}
.language-line {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.65;
  text-align: start;
}
.language-line[data-action="speak-text"] {
  cursor: pointer;
}
.language-line[data-action="speak-text"]:hover {
  border-color: var(--accent);
}
.language-line__text {
  flex: 1;
  min-inline-size: 0;
  unicode-bidi: isolate;
  text-align: start;
  overflow-wrap: anywhere;
}
.quiz-question {
  display: grid;
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}
.quiz-options-title {
  margin: 0;
  font-size: 1rem;
  color: var(--muted);
}
.quiz-options {
  display: grid;
  gap: 0.55rem;
}
.quiz-option {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  inline-size: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  text-align: start;
  cursor: pointer;
}
.quiz-option:hover:not(:disabled) {
  border-color: var(--accent);
}
.quiz-option:disabled {
  cursor: default;
  opacity: 0.72;
}
.quiz-option__text {
  unicode-bidi: isolate;
}
.quiz-option.is-correct {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.quiz-option.is-incorrect {
  border-color: var(--danger);
  box-shadow: inset 0 0 0 1px var(--danger);
}
.quiz-option.is-speaking {
  background-color: rgba(127, 127, 127, 0.16);
  background-color: color-mix(in srgb, var(--accent) 18%, transparent);
}
.quiz-feedback {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.quiz-feedback.is-correct {
  border-color: var(--accent);
}
.quiz-feedback.is-incorrect {
  border-color: var(--danger);
}
.build-sentence {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  min-block-size: 3.2rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.build-placeholder {
  color: var(--muted);
  unicode-bidi: isolate;
}
.build-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.build-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
}
.build-chip:hover {
  border-color: var(--accent);
}
.build-chip__text {
  unicode-bidi: isolate;
}
.build-chip__remove {
  color: var(--muted);
  font-size: 0.85rem;
}
.build-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.exercise-settings {
  margin-block-end: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  overflow: hidden;
}
.exercise-settings__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  inline-size: 100%;
  padding: 0.85rem 1rem;
  border: 0;
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: start;
  cursor: pointer;
}
.exercise-settings__header:hover {
  color: var(--accent);
}
.exercise-settings__title {
  unicode-bidi: isolate;
}
.exercise-settings__chevron {
  color: var(--muted);
}
.exercise-settings__body {
  padding: 0 1rem 1rem;
}
.exercise-config {
  display: grid;
  gap: 0.75rem;
  margin-block-end: 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
}
.config-row {
  display: grid;
  gap: 0.3rem;
}
.config-label {
  color: var(--muted);
  font-size: 0.85rem;
}
.reveal-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ------------------------------------------------------------
Progress
------------------------------------------------------------ */
.progress-stage {
  display: grid;
  gap: 1rem;
}
.progress-section {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  overflow: hidden;
  margin-bottom: 1rem;
}
.progress-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  inline-size: 100%;
  padding: 1rem;
  border: 0;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  text-align: start;
  cursor: pointer;
}
.progress-section__header:hover {
  color: var(--accent);
}
.progress-section__title {
  unicode-bidi: isolate;
}
.progress-section__chevron {
  color: var(--muted);
}
.progress-section__heading {
  margin: 0;
  padding: 1rem 1rem 0;
  font-size: 1rem;
}
.progress-section__body {
  display: grid;
  gap: 0.75rem;
  padding: 0 1rem 1rem;
}
.progress-list {
  display: grid;
  gap: 0.55rem;
}
.progress-record {
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  unicode-bidi: isolate;
  overflow-wrap: anywhere;
}
.progress-reset-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block-start: var(--space-3);
}

/* ------------------------------------------------------------
Larger screens (responsive enhancement only)
------------------------------------------------------------ */
@media (min-width: 700px) {
  .app-toolbar {
    padding-inline: var(--space-4);
  }
}

/* =========================================
   TABLET ADJUSTMENTS (min-width: 768px)
   ========================================= */
@media (min-width: 768px) {
  /* 4 columns on tablets for even more compactness */
  .letter-quiz-options {
    grid-template-columns: repeat(4, 1fr);
    max-width: 480px;
  }

  .letter-quiz-option {
    font-size: 1.3rem;
    padding: 1rem;
  }

  .letter-spell-chip {
    font-size: 1.25rem;
    padding: 0.6rem 1rem;
  }
}

/* ------------------------------------------------------------
Proficiency tiers (Stage A1)
------------------------------------------------------------ */
.proficiency-tier {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  overflow: hidden;
}
.proficiency-tier__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  inline-size: 100%;
  padding: 1rem 1.1rem;
  border: 0;
  background: var(--surface);
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: start;
  cursor: pointer;
}
.proficiency-tier__header:hover {
  color: var(--accent);
}
.proficiency-tier__title {
  unicode-bidi: isolate;
}
.proficiency-tier__progress {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 400;
}
.proficiency-tier__body {
  display: grid;
  gap: var(--space-2);
  padding: 0 var(--space-3) var(--space-3);
}
.grammar-subsection {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}

/* ------------------------------------------------------------
Onboarding (Stage B1)
------------------------------------------------------------ */
.onboarding-stage {
  display: grid;
  gap: var(--space-4);
}
.onboarding-title {
  margin: 0;
  font-size: 1.2rem;
}
.onboarding-intro {
  margin: 0;
  color: var(--muted);
}
.onboarding-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.onboarding-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.onboarding-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.onboarding-option {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-block-size: 2.2rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
}
.onboarding-option input {
  accent-color: var(--accent);
}
.onboarding-option__label {
  unicode-bidi: isolate;
}

/* ------------------------------------------------------------
Next Up card (Stage B3)
------------------------------------------------------------ */
.next-up-card {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  margin-block-end: var(--space-3);
  border: 2px solid var(--accent);
  border-radius: var(--radius-xl);
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
}
.next-up-card__label {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.next-up-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  unicode-bidi: isolate;
}
.next-up-card__tier {
  display: inline-block;
  align-self: start;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.78rem;
}
.next-up-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block-start: var(--space-1);
}
.browse-by-level {
  margin: var(--space-3) 0 var(--space-2);
  font-size: 1rem;
  color: var(--muted);
  font-weight: 600;
}
.study-plan-list {
  margin-block-end: var(--space-3);
}
.study-plan-item {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  margin-block-end: var(--space-1);
}
.study-plan-item__status {
  flex: 0 0 auto;
  font-size: 0.9rem;
}
.study-plan-item__title {
  flex: 1;
  min-inline-size: 0;
  unicode-bidi: isolate;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.study-plan-item__open {
  flex: 0 0 auto;
  padding: 0.3rem 0.7rem;
  min-block-size: 2rem;
  font-size: 0.85rem;
}
.study-plan-item--next {
  box-shadow: inset 3px 0 0 0 var(--accent);
}
.lesson-card.is-complete,
.study-plan-item.is-complete,
.plan-lesson-item.is-complete {
  opacity: 0.65;
}

/* ------------------------------------------------------------
Study Plan progress section (Stage B4)
------------------------------------------------------------ */
.plan-progress-bar {
  block-size: 0.6rem;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
  margin-block-end: var(--space-2);
}
.plan-progress-fill {
  block-size: 100%;
  border-radius: 999px;
  background: var(--accent);
}
.plan-progress-label {
  color: var(--muted);
  font-size: 0.85rem;
  margin-block-end: var(--space-3);
}
.plan-lesson-list {
  display: grid;
  gap: var(--space-1);
}
.plan-lesson-item {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
}
.plan-lesson-title {
  flex: 1;
  min-inline-size: 0;
  unicode-bidi: isolate;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block-start: var(--space-3);
}

/* Complete? toggle in lesson action bar */
.complete-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-block-size: 2.4rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  flex: 0 0 auto;
  margin-inline-start: auto;
}
.complete-toggle:hover {
  border-color: var(--accent);
}
.complete-toggle input {
  accent-color: var(--accent);
}
.complete-toggle__label {
  unicode-bidi: isolate;
  font-size: 0.85rem;
}

/* =========================================
   BOTTOM BAR: COMBINED PROGRESS & COMPLETE
   ========================================= */

/* Base Toggle Container */
.complete-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem; /* Compact for mobile */
  font-weight: 600;
  white-space: nowrap; /* Prevents wrapping on small screens */
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

/* State 1: In Progress (e.g., 25→80%) */
.complete-toggle.is-progress {
  background: var(--accent-light, #e0e7ff);
  color: var(--accent-dark, #3730a3);
  border-color: var(--accent, #6366f1);
}

/* State 2: Goal Met / Completed (e.g., Complete?) */
.complete-toggle.is-complete {
  background: var(--success-light, #dcfce7);
  color: var(--success-dark, #166534);
  border-color: var(--success, #22c55e);
}

/* Checkbox Styling */
.complete-toggle input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  margin: 0;
  cursor: pointer;
  accent-color: var(--accent, #6366f1);
}

.complete-toggle.is-complete input[type="checkbox"] {
  accent-color: var(--success, #22c55e);
}

/* Status icon in lesson cards */
.lesson-card__status {
  flex: 0 0 auto;
  font-size: 0.9rem;
  margin-inline-end: var(--space-2);
}

/* ------------------------------------------------------------
Phonetic display mode (Stage E2)
------------------------------------------------------------ */
.phonetic-cell {
  display: grid;
  justify-items: center;
  gap: 0.35rem;
  padding-block: 0.6rem;
}
.phonetic-cell__char {
  font-size: 1.45rem;
  line-height: 1.3;
}
.phonetic-cell__note {
  font-size: 0.85rem;
  color: var(--muted);
  unicode-bidi: isolate;
  text-align: center;
  overflow-wrap: anywhere;
}
.item-column--header {
  flex-basis: 100%;
  border: none;
  margin-block-start: var(--space-2);
}

/* ------------------------------------------------------------
Getting Started guide (Stage F2)
------------------------------------------------------------ */
.help-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-inline-start: 1.4rem;
}
.help-list li {
  unicode-bidi: isolate;
  overflow-wrap: anywhere;
}

/* ------------------------------------------------------------
Target Language Selection (v3)
------------------------------------------------------------ */
.target-select-stage {
  display: grid;
  gap: var(--space-4);
  max-inline-size: 480px;
  margin-inline: auto;
  padding-block-start: 2rem;
}
.target-select-title {
  margin: 0;
  font-size: 1.4rem;
  text-align: center;
}
.target-select-intro {
  margin: 0;
  color: var(--muted);
  text-align: center;
}
.target-select-list {
  display: grid;
  gap: var(--space-2);
}
.target-select-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  inline-size: 100%;
  min-block-size: 3rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  font-size: 1.05rem;
  cursor: pointer;
  text-align: start;
}
.target-select-option:hover {
  border-color: var(--accent);
  background: var(--surface-2);
}
.target-select-flag {
  font-size: 1.5rem;
}
.target-select-name {
  unicode-bidi: isolate;
}

/* ------------------------------------------------------------
Script display mode (v3 Baseline)
------------------------------------------------------------ */
.script-cell {
  display: grid;
  justify-items: center;
  gap: 0.35rem;
  padding-block: 0.6rem;
}
.script-cell__char {
  font-size: 1.45rem;
  line-height: 1.3;
}
.script-cell__connections {
  font-size: 0.85rem;
  color: var(--muted);
  unicode-bidi: isolate;
  text-align: center;
  overflow-wrap: anywhere;
}
.script-cell__forms {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.25rem;
  width: 100%;
  margin-block-start: 0.75rem;
  text-align: center;
  font-size: 1.25rem;
  border-top: 1px dashed var(--line);
  padding-block-start: 0.5rem;
}
.script-cell__form-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}
.script-cell__form-label {
  font-size: 0.6rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.script-cell__note {
  font-size: 0.85rem;
  color: var(--muted);
  unicode-bidi: isolate;
  text-align: center;
  overflow-wrap: anywhere;
  margin-block-start: 0.35rem;
  border-block-start: 1px dashed var(--line);
  padding-block-start: 0.35rem;
  width: 100%;
}

/* ------------------------------------------------------------
v3.1 Stage 2: Enhanced Next Up Card & Grammar Overlay
------------------------------------------------------------ */
.next-up-card {
  padding: var(--space-3);
}
.next-up-card__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  unicode-bidi: isolate;
}
.next-up-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--muted);
}
.next-up-card__level {
  font-weight: 500;
}
.next-up-card__nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-block-start: var(--space-1);
  padding-block-start: var(--space-2);
  border-block-start: 1px dashed var(--line);
}
.next-up-card__progress {
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}
.next-up-card__open {
  margin-inline-start: auto;
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
  font-weight: 600;
}
.grammar-overlay__description {
  font-size: 1rem;
  line-height: 1.6;
  margin: 0 0 var(--space-4) 0;
}
.grammar-overlay__examples {
  margin: 0;
  padding-inline-start: 1.2rem;
  display: grid;
  gap: var(--space-2);
}
.grammar-overlay__example {
  font-style: italic;
  color: var(--muted);
  unicode-bidi: isolate;
}

/* ------------------------------------------------------------
Record Overlay (Stage 5)
------------------------------------------------------------ */
.record-overlay__body {
  min-block-size: 15rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.95rem;
}
.record-overlay__instruction {
  margin: 0 0 var(--space-3) 0;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}
.record-overlay__text {
  margin-block-end: var(--space-4);
  width: 100%;
  justify-content: center;
}
.record-overlay__btn {
  margin-block-start: var(--space-3);
}

/* Record & Compare Toolbar Toggle */
#toggle-record {
  opacity: 0.4;
  transition:
    opacity 0.2s ease,
    color 0.2s ease;
}

#toggle-record.is-active {
  opacity: 1;
  color: var(
    --accent,
    #007bff
  ); /* Falls back to blue if --accent isn't defined */
}

/* ------------------------------------------------------------
Stage 4: Milestone Visual States & Auto-Complete Progress
------------------------------------------------------------ */
.milestone-card.is-locked {
  background: var(--surface-2);
  color: var(--muted);
  border-color: var(--line);
  cursor: not-allowed;
  opacity: 0.6;
}
.milestone-card.is-locked .lesson-card__status {
  filter: grayscale(0.5);
}
.milestone-card.is-locked:hover {
  border-color: var(--line);
  background: var(--surface-2);
}

.milestone-card.is-in-progress {
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  border-color: var(--accent);
  border-width: 2px;
}
.milestone-card.is-in-progress .lesson-card__title {
  font-weight: 700;
}

.milestone-card.is-complete {
  opacity: 0.75;
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

.culture-toggle-btn {
  font-size: 1.2rem;
  margin-inline-start: 0.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease;
}
.culture-toggle-btn.is-active {
  transform: scale(1.15);
  filter: drop-shadow(0 0 4px var(--accent));
}
.cultural-context-panel {
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  border-inline-start: 4px solid var(--accent);
  padding: 1rem;
  margin: 0.5rem 0 1.5rem 0;
  border-radius: 0 8px 8px 0;
  animation: slideDown 0.2s ease-out;
}
.cultural-context-panel__text {
  margin: 0;
  line-height: 1.6;
  font-size: 0.95rem;
  color: var(--text-secondary);
}
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.cultural-context-box {
  background: var(--surface-2, #f0f4f8);
  border-left: 4px solid var(--accent, #4a90e2);
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 4px;
  font-size: 0.95rem;
}
.dialogue-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 1.5rem 0;
}
.dialogue-context {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted, #666);
  margin-bottom: 0.5rem;
}
.chat-bubble {
  max-width: 85%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}
.chat-bubble--a {
  align-self: flex-start;
  background: var(--surface-2, #e9ecef);
  border-bottom-left-radius: 4px;
}
.chat-bubble--b {
  align-self: flex-end;
  background: var(--accent, #4a90e2);
  color: white;
  border-bottom-right-radius: 4px;
}
.chat-bubble__text {
  display: block;
}
/* ------------------------------------------------------------
Letter Flashcards
------------------------------------------------------------ */
.letter-flashcard {
  display: grid;
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  text-align: center;
}
.letter-flashcard__front {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 10rem;
  padding: 2rem;
}
.letter-flashcard__char {
  font-size: 6rem;
  line-height: 1.2;
  font-weight: 600;
  color: var(--text);
  unicode-bidi: isolate;
}
.letter-flashcard__back {
  display: grid;
  gap: 1rem;
  padding: 1.5rem;
  border: 1px dashed var(--line);
  border-radius: 14px;
  background: var(--surface-2);
  text-align: center;
}
.letter-flashcard__name {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  unicode-bidi: isolate;
}
.letter-flashcard__note {
  font-size: 1rem;
  color: var(--muted);
  unicode-bidi: isolate;
}
.letter-flashcard__back .script-cell__forms {
  margin: 0 auto;
  max-width: 20rem;
}

/* ------------------------------------------------------------
Letter Quiz
------------------------------------------------------------ */
.letter-quiz-prompt {
  text-align: center;
  margin-block-end: 1.5rem;
  font-size: 1.1rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.letter-quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-block-end: 1.5rem;
}
.letter-quiz-option {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  font-size: 3rem;
  font-weight: 600;
  border: 2px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition:
    border-color 0.2s,
    background 0.2s;
}
.letter-quiz-option:hover:not(:disabled) {
  border-color: var(--accent);
}
.letter-quiz-option:disabled {
  cursor: default;
  opacity: 0.8;
}
.letter-quiz-option.is-correct {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, var(--surface));
  color: var(--accent);
}
.letter-quiz-option.is-incorrect {
  border-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 15%, var(--surface));
  color: var(--danger);
}

/* ------------------------------------------------------------
Letter Spell (Audio Spelling)
------------------------------------------------------------ */
.letter-spell-prompt {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-block: 1.5rem;
}
.letter-spell-play-btn {
  font-size: 2.5rem;
  padding: 1rem 1.5rem;
  border-radius: 50%;
  background: var(--surface-2);
  border: 2px solid var(--accent);
  color: var(--accent);
  transition:
    transform 0.1s ease,
    background 0.2s ease;
}
.letter-spell-play-btn:active {
  transform: scale(0.95);
}
.letter-spell-target {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  min-block-size: 4rem;
  padding: 1rem;
  border: 2px dashed var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  margin-block-end: 1.5rem;
  justify-content: center;
}
.letter-spell-placeholder {
  color: var(--muted);
  font-size: 0.95rem;
  unicode-bidi: isolate;
}
.letter-spell-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-block-end: 1.5rem;
}
.letter-spell-chip {
  font-size: 1.25rem;
  min-width: 2.5rem;
  justify-content: center;
}

/* =========================================
   MOBILE-FIRST & COMPACT LAYOUT FIXES
   For Letter Quiz & Audio Spelling Views
   ========================================= */

/* 1. View Containers & Bottom Bar Overlap Fix */
/* Reduces height by 1vh and ensures flex layout for proper scrolling */
#letter-quiz-view,
#letter-spell-view {
  display: flex;
  flex-direction: column;
  height: 99vh; /* Reduced by 1vh to prevent bottom border cutoff */
  max-height: 99dvh; /* Dynamic viewport height for modern mobile browsers */
  overflow: hidden;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* Ensure the inner stages scroll properly so the "Next" button is never hidden */
#letter-spell-stage,
#letter-quiz-view .quiz-stage {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 2rem; /* Guarantees space above the fixed bottom bar */
}

/* 2. Letter Quiz: Compact Card Grid */
/* Changes from 2 columns to 3 columns on mobile to prevent oversized cards */
.letter-quiz-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 3x3 or 3x2 grid */
  gap: 0.5rem; /* Tighter gap */
  padding: 0.5rem 0;
  max-width: 360px; /* Prevents cards from stretching too wide on tablets */
  margin: 0 auto;
}

.letter-quiz-option {
  font-size: 1.2rem; /* Smaller, more compact text */
  padding: 0.75rem 0.5rem;
  min-height: auto;
  aspect-ratio: 1 / 1; /* Keeps them perfectly square but smaller */
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.1;
}

/* 3. Audio Spelling: Compact Chips & Areas */
.letter-spell-target,
.letter-spell-pool {
  gap: 0.4rem; /* Tighter spacing between chips */
  padding: 0.5rem;
  min-height: auto;
}

.letter-spell-chip,
.letter-spell-target .build-chip {
  font-size: 1.1rem; /* Smaller chip text */
  padding: 0.5rem 0.75rem;
  min-width: auto;
  border-radius: 8px;
}

.letter-spell-prompt {
  margin-bottom: 0.5rem;
}

/* Ensure the "Next" button in Audio Spelling stays pinned to the bottom of the view */
#letter-spell-stage .build-actions {
  position: sticky;
  bottom: 0;
  background: var(--bg, #ffffff); /* Fallback if CSS var isn't defined */
  padding: 0.75rem 0;
  margin-top: auto;
  flex-shrink: 0;
  border-top: 1px solid var(--border, #e5e7eb);
}

/* 4. General Compactness for these Views */
/* Reduces header and status text sizes */
#letter-quiz-view .document-header,
#letter-spell-view .document-header {
  padding: 0.5rem 1rem;
  flex-shrink: 0;
}

#letter-quiz-view .document-title,
#letter-spell-view .document-title {
  font-size: 1.15rem;
}

.quiz-status,
.flashcard-status {
  font-size: 0.85rem;
  padding: 0.25rem 0;
  margin-bottom: 0.5rem;
}

.quiz-option,
.build-chip,
.letter-quiz-option {
  min-block-size: 2.75rem; /* 44px minimum for quiz options */
}

/* =========================================
   TABLET ADJUSTMENTS (min-width: 768px)
   ========================================= */
@media (min-width: 768px) {
  /* 4 columns on tablets for even more compactness */
  .letter-quiz-options {
    grid-template-columns: repeat(4, 1fr);
    max-width: 480px;
  }

  .letter-quiz-option {
    font-size: 1.3rem;
    padding: 1rem;
  }

  .letter-spell-chip {
    font-size: 1.25rem;
    padding: 0.6rem 1rem;
  }
}

/* Ensure the bottom bar distributes space well on mobile */
#bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  overflow-x: auto; /* Allows horizontal scroll if screen is extremely narrow */
  -ms-overflow-style: none;
  scrollbar-width: none;
}
#bottom-bar::-webkit-scrollbar {
  display: none;
}

/* Settings button alignment */
#bottom-bar [data-action="open-settings"] {
  margin-inline-start: auto; /* Pushes settings to the far right */
  flex-shrink: 0;
}