:root {
  --bg: #f5f5f0;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --again: #b91c1c;
  --hard: #c2410c;
  --good: #166534;
  --easy: #1d4ed8;
  --success-bg: #dcfce7;
  --success-text: #166534;
  --danger-bg: #fee2e2;
  --danger-text: #991b1b;
  --hint-bg: #fef9c3;
  --hint-text: #854d0e;
  --info-bg: #eff6ff;
  --info-border: #93c5fd;
  --info-text: #1d4ed8;
  --warning-bg: #fef3c7;
  --warning-border: #f59e0b;
  --warning-text: #92400e;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── Layout ── */
.view {
  display: none;
  width: 100%;
  max-width: 480px;
  padding: 24px 16px;
  flex-direction: column;
  gap: 16px;
}
.view.active {
  display: flex;
}

/* ── Nav ── */
nav {
  width: 100%;
  max-width: 480px;
  display: flex;
  justify-content: space-around;
  padding: calc(12px + env(safe-area-inset-top)) 0 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}
nav button {
  background: none;
  border: none;
  font-size: 15px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 20px;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
}
@media (max-width: 400px) {
  nav button { font-size: 14px; padding: 8px 10px; }
}
nav button.active {
  background: var(--primary);
  color: #fff;
}

/* ── Cards / surfaces ── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

/* ── Home view ── */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.stat-box {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  text-align: center;
}
.stat-box .value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}
.stat-box .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.study-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 18px;
  font-weight: 600;
  padding: 18px;
  cursor: pointer;
  transition: background 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.study-btn:hover { background: var(--primary-hover); }
.study-btn .badge {
  background: rgba(255,255,255,0.25);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 14px;
}

.mode-select {
  display: flex;
  gap: 8px;
}
.mode-select button {
  flex: 1;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}
.mode-select button.active {
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* ── Study view ── */
.study-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.back-btn {
  background: none;
  border: none;
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 0;
}
.progress-text {
  font-size: 14px;
  color: var(--text-muted);
}

/* ── Flashcard flip ── */
.flashcard-wrapper {
  perspective: 1000px;
  min-height: 220px;
  cursor: pointer;
}
.flashcard {
  width: 100%;
  height: 220px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.45s ease;
  border-radius: var(--radius);
}
.flashcard.flipped {
  transform: rotateY(180deg);
}
.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  gap: 10px;
}
.flashcard-back {
  transform: rotateY(180deg);
}
.card-word {
  font-size: clamp(22px, 7vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
}
.card-translit {
  font-size: 16px;
  color: var(--text-muted);
  font-style: italic;
}
.card-hint {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
}
.card-category {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 10px;
}

/* ── Rating buttons ── */
.rating-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  transition: opacity 0.2s;
}
.rating-buttons.hidden {
  opacity: 0;
  pointer-events: none;
}
.rating-btn {
  min-height: 44px;
  padding: 12px 6px;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s;
}
.rating-btn:hover { filter: brightness(0.9); }
.rating-btn.again { background: var(--again); color: #fff; }
.rating-btn.hard  { background: var(--hard);  color: #fff; }
.rating-btn.good  { background: var(--good);  color: #fff; }
.rating-btn.easy  { background: var(--easy);  color: #fff; }

/* ── Session summary ── */
.session-summary {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: center;
}
.session-summary h2 {
  font-size: 22px;
}
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.summary-home-btn {
  margin-top: 8px;
}

/* ── Stats view ── */
.stats-section h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.category-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.category-row:last-child { border-bottom: none; }
.progress-bar-wrap {
  width: 100px;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.4s;
}

/* ── Utility ── */
.btn-secondary {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-secondary:hover { background: var(--border); }

h2 { font-size: 20px; font-weight: 700; }
p  { font-size: 15px; color: var(--text-muted); line-height: 1.5; }

@media (max-width: 360px) {
  .card-word { font-size: 28px; }
  .stats-strip { grid-template-columns: 1fr 1fr; }
}

/* ── Utility ── */
.hidden { display: none !important; }

.card-subtitle { margin-top: 6px; }

.stats-total-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}
.stats-total-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.category-count {
  font-size: 12px;
  color: var(--text-muted);
}

.value--again { color: var(--again); }
.value--hard  { color: var(--hard);  }
.value--good  { color: var(--good);  }
.value--easy  { color: var(--easy);  }

/* ── Daily goal ── */
.daily-goal { padding: 16px 20px; }
.daily-goal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.goal-edit-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-muted);
  padding: 0 4px;
  line-height: 1;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.goal-edit-btn:hover { color: var(--text); }
.daily-goal-new {
  margin-top: 10px;
  margin-bottom: 0;
  padding-top: 10px;
  border-top: 1px solid var(--border, rgba(0,0,0,0.08));
}

/* ── Category filter ── */
.category-filter {
  width: 100%;
  padding: 8px 10px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}
.category-filter:focus { outline: none; border-color: var(--primary); }

/* ── Writing input actions row ── */
.writing-input-actions {
  display: flex;
  gap: 8px;
}
.writing-input-actions .btn-check { flex: 1; }
.btn-hint {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.btn-hint:hover { background: var(--border); }
.writing-feedback.hint {
  background: var(--hint-bg);
  color: var(--hint-text);
  letter-spacing: 0.15em;
  font-size: 20px;
}

/* ── Text quiz ── */
.text-quiz-area {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.text-quiz-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 32px 24px;
  text-align: center;
}
.text-quiz-word {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
}

/* ── Sentence rating ── */
.sentence-rating {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

/* ── Custom words ── */
.custom-words-section {
  padding: 0;
}
.custom-words-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  list-style: none;
  user-select: none;
}
.custom-words-summary::-webkit-details-marker { display: none; }
.custom-words-summary::before {
  content: "▶";
  font-size: 12px;
  color: var(--text-muted);
  transition: transform 0.2s;
}
details[open] .custom-words-summary::before { transform: rotate(90deg); }
.custom-words-badge {
  background: var(--primary);
  color: #fff;
  border-radius: 12px;
  padding: 1px 8px;
  font-size: 12px;
  font-weight: 700;
  margin-left: auto;
}
.custom-words-list {
  padding: 0 20px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.custom-words-empty {
  font-size: 13px;
  color: var(--text-muted);
  padding: 8px 0;
}
.custom-word-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.custom-word-row:last-child { border-bottom: none; }
.custom-word-info { flex: 1; }
.custom-word-cat {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 8px;
}
.custom-word-del {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.custom-word-del:hover { color: var(--again); }
.custom-word-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 20px 20px;
  border-top: 1px solid var(--border);
}
.custom-word-form input {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.custom-word-form input:focus { border-color: var(--primary); }

/* ── Skill grid (home) ── */
.skill-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.skill-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.skill-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.skill-icon {
  font-size: 28px;
  flex-shrink: 0;
}
.skill-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}
.skill-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: #fff;
  background: var(--good, #16a34a);
  border-radius: 999px;
  padding: 2px 7px;
  margin-left: 6px;
  vertical-align: middle;
}
.skill-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
/* ── Home: "what's next" recommendation ── */
.next-step-card {
  border-left: 4px solid var(--primary);
  background: var(--info-bg);
}
.next-step-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--primary);
  margin-bottom: 6px;
}
.next-step-text {
  font-size: 15px;
  line-height: 1.4;
  margin-bottom: 12px;
}
.next-step-card .skill-start-btn { width: 100%; }

/* ── Home: primary CTA + collapsed mode grid ───────────── */
.home-primary-cta {
  width: 100%;
  font-size: 18px;
  padding: 18px;
}
.home-all-modes summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 10px 4px;
  list-style: none;
}
.home-all-modes summary::-webkit-details-marker { display: none; }
.home-all-modes .skill-grid { margin-top: 12px; }

.skill-start-btn {
  min-height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.skill-start-btn:hover { background: var(--primary-hover); }
.skill-start-btn:disabled { opacity: 0.5; cursor: default; }
.mode-select-mini {
  display: flex;
  gap: 6px;
}
.mode-select-mini button {
  min-height: 44px;
  flex: 1;
  padding: 7px 4px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s;
}
.mode-select-mini button.active {
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}
.toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
}

/* ── Speaker button ── */
.speaker-btn {
  min-height: 44px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
  align-self: flex-start;
  transition: background 0.15s;
}
.speaker-btn:hover { background: var(--border); }

/* ── Writing / typing mode ── */
.writing-input-area {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.writing-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.writing-input:focus { border-color: var(--primary); }
.btn-check {
  min-height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-check:hover { background: var(--primary-hover); }
.writing-feedback {
  font-size: 14px;
  font-weight: 600;
  padding: 10px;
  border-radius: 8px;
  text-align: center;
}
.writing-feedback.correct { background: var(--success-bg); color: var(--success-text); }
.writing-feedback.wrong   { background: var(--danger-bg); color: var(--danger-text); }

/* ── Listening quiz ── */
.listening-quiz-area {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.listen-prompt {
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: center;
  padding: 28px 24px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.listen-hint {
  font-size: 14px;
  color: var(--text-muted);
}
.replay-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  font-size: 22px;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.replay-btn:hover { background: var(--primary-hover); }
.mc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.mc-btn {
  padding: 18px 10px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
  line-height: 1.3;
}
.mc-btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.mc-btn.correct { border-color: var(--good);  background: var(--success-bg); color: var(--success-text); }
.mc-btn.wrong   { border-color: var(--again); background: var(--danger-bg); color: var(--danger-text); }
.mc-btn:disabled { cursor: default; }

/* ── Quiz error hints (wrong answer explanations) ── */
.quiz-error-hint {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: 8px;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--warning-text);
}
.quiz-error-hint.hidden { display: none; }
.quiz-error-hint .qeh-label {
  font-weight: 700;
  display: block;
  margin-bottom: 3px;
}
.quiz-error-hint .qeh-word {
  font-size: 1.05rem;
  font-weight: 600;
}
.quiz-error-hint .qeh-pinyin {
  font-style: italic;
  margin-left: 4px;
}
.quiz-error-hint .qeh-example {
  display: block;
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-style: italic;
  border-top: 1px solid var(--warning-border);
  padding-top: 6px;
}

/* ── Speaking mode ── */
.speaking-area {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.mic-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 32px 24px;
  text-align: center;
}
.mic-word-display {
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}
.mic-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 72px;
  height: 72px;
  font-size: 28px;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mic-btn:hover { background: var(--primary-hover); }
.mic-btn--listening {
  background: var(--again);
  animation: mic-pulse 1s ease-in-out infinite;
}
@keyframes mic-pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.1); }
}
.mic-status {
  font-size: 14px;
  color: var(--text-muted);
  min-height: 20px;
}
.mic-transcript {
  font-size: 16px;
  font-style: italic;
  color: var(--text-muted);
  min-height: 24px;
}

/* ── Reading / sentence mode ── */
.reading-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sentence-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 160px;
  justify-content: center;
}
.sentence-ru {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}
.sentence-en {
  font-size: 16px;
  color: var(--text-muted);
  font-style: italic;
}
.btn-reveal-sentence {
  min-height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 14px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-reveal-sentence:hover { background: var(--primary-hover); }
.btn-next-sentence {
  background: var(--surface);
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: var(--radius);
  padding: 14px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-next-sentence:hover { background: var(--primary); color: #fff; }

/* ── English speaker button ── */
.speaker-btn-row {
  display: flex;
  gap: 8px;
  align-self: flex-start;
}
.btn-speak-en {
  background: var(--info-bg);
  border-color: var(--info-border);
  color: var(--info-text);
}
.btn-speak-en:hover { background: #dbeafe; }

/* ── Phonetic (IPA) display on card back ── */
.card-phonetic {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 2px;
}

.card-example {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border, rgba(0,0,0,.08));
  max-width: 90%;
}
.card-example-en {
  display: block;
  font-size: 15px;
  color: var(--text, #1a1a1a);
}
.card-example-ru {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Listening language toggle ── */
.listen-lang-toggle {
  align-self: flex-end;
  font-size: 13px;
}

/* ── Grammar module ── */
.grammar-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.grammar-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 18px;
  cursor: pointer;
  transition: box-shadow 0.15s, border-color 0.15s;
  border: 2px solid transparent;
  position: relative;
}
.grammar-card:hover { border-color: var(--primary); }
.grammar-card--learned { border-color: var(--good); background: #f0fdf4; }

.grammar-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}
.grammar-card-id {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.grammar-learned-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--good);
  background: var(--success-bg);
  padding: 2px 10px;
  border-radius: 10px;
}
.grammar-card-rule {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}
.grammar-card-score {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.grammar-detail-rule {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.3;
}
.grammar-detail-explanation {
  font-size: 14px;
  color: var(--text);
  line-height: 1.6;
  margin: 0;
}
.grammar-section-heading {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.grammar-examples {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.grammar-examples th {
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.grammar-examples td {
  padding: 8px 6px 8px 0;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
  line-height: 1.4;
}
.grammar-examples tr:last-child td { border-bottom: none; }
.grammar-examples td.wrong  { color: var(--again); font-style: italic; }
.grammar-examples td.correct { color: var(--success-text); font-weight: 600; }
.grammar-examples td.note { color: var(--text-muted); font-size: 14px; }

.grammar-quiz-question {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.4;
}
.grammar-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}
.grammar-quiz-option {
  width: 100%;
  min-height: 44px;
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  line-height: 1.3;
}
.grammar-quiz-option:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.grammar-quiz-option:disabled { cursor: default; }
.grammar-quiz-option--correct { border-color: var(--good) !important; background: var(--success-bg) !important; color: var(--success-text) !important; font-weight: 600; }
.grammar-quiz-option--wrong   { border-color: var(--again) !important; background: var(--danger-bg) !important; color: var(--danger-text) !important; }

.grammar-quiz-feedback {
  font-size: 14px;
  font-weight: 600;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 10px;
  line-height: 1.4;
}
.grammar-quiz-feedback--correct { background: var(--success-bg); color: var(--success-text); }
.grammar-quiz-feedback--wrong   { background: var(--danger-bg); color: var(--danger-text); }

.grammar-quiz-next {
  width: 100%;
  margin-bottom: 8px;
}
.grammar-quiz-progress {
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
}
.grammar-quiz-done {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}
.grammar-quiz-restart-btn { width: 100%; }

/* ── Banners ── */
.banner {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
}
.banner--warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border: 1px solid var(--warning-border);
}
.banner--info {
  background: var(--info-bg);
  color: var(--info-text);
  border: 1px solid var(--info-border);
}

/* ── Session summary — next session ── */
.summary-next-session {
  background: var(--bg);
  border-radius: 8px;
  padding: 12px;
  text-align: left;
}
.summary-next-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.summary-due-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}
.due-badge {
  background: var(--primary);
  color: #fff;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 600;
}
.summary-return-hint {
  font-size: 14px;
  color: var(--text-muted);
}
.summary-caught-up {
  background: var(--success-bg);
  color: var(--success-text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 600;
  text-align: left;
}

/* ── CEFR Progress ── */
.cefr-section { padding: 20px 24px; }
.cefr-mastered-count {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
}
.cefr-mastered-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}
.cefr-mastered-label {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.3;
}
.cefr-ladder {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
.cefr-step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 2px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}
.cefr-step--done {
  border-color: var(--good);
  color: var(--text);
  background: var(--success-bg);
}
.cefr-step--current {
  border-color: var(--primary);
  background: var(--info-bg);
  font-weight: 600;
  color: var(--primary);
}
.cefr-badge {
  font-size: 12px;
  font-weight: 700;
  background: var(--bg);
  padding: 2px 7px;
  border-radius: 6px;
  min-width: 30px;
  text-align: center;
  flex-shrink: 0;
}
.cefr-step--done .cefr-badge    { background: var(--success-bg); color: var(--success-text); }
.cefr-step--current .cefr-badge { background: var(--primary); color: #fff; }
.cefr-label { flex: 1; }
.cefr-current-marker {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
}
.cefr-next {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
}

/* ── Speaking EN mode ── */
.speak-en-instruction {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-align: center;
}
.speak-en-expected {
  font-size: 22px;
  font-weight: 600;
  color: var(--primary);
  margin: 8px 0;
  text-align: center;
  line-height: 1.3;
}
.speak-en-fallback-msg {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 8px;
  text-align: center;
  line-height: 1.4;
}
.mic-feedback {
  font-size: 13px;
  font-weight: 600;
  padding: 10px 12px;
  border-radius: 8px;
  margin-top: 8px;
  line-height: 1.4;
  text-align: center;
}
.mic-feedback--correct { background: var(--success-bg); color: var(--success-text); }
.mic-feedback--wrong   { background: var(--danger-bg); color: var(--danger-text); }
.mic-feedback--partial { background: var(--hint-bg); color: var(--hint-text); }

.grammar-mark-learned-btn {
  width: 100%;
  padding: 14px;
  border: 2px solid var(--good);
  border-radius: 8px;
  background: var(--surface);
  color: var(--success-text);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.grammar-mark-learned-btn:hover { background: var(--success-bg); }
.grammar-mark-learned--done {
  background: var(--success-bg);
  color: var(--success-text);
}

/* AI lesson */
.ai-hero-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ai-mini-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.ai-mini-stat {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}
.ai-mini-stat span {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}
.ai-mini-stat small {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-muted);
}
.ai-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ai-section-title {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.profile-level-display {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}
.ai-field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.ai-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ai-field--wide {
  grid-column: 1 / -1;
}
.ai-field span {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}
.ai-field input,
.ai-field select,
.ai-field textarea,
.ai-output {
  width: 100%;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  line-height: 1.45;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s;
}
.ai-field input:focus,
.ai-field select:focus,
.ai-field textarea:focus,
.ai-output:focus {
  border-color: var(--primary);
}
.ai-output {
  resize: vertical;
  min-height: 120px;
}
.ai-json-editor {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 14px;
}
.ai-action-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.ai-action-row button {
  flex: 1 1 120px;
}
.ai-status {
  min-height: 20px;
  margin: 0;
  font-size: 14px;
  font-weight: 600;
}
.ai-status--info { color: var(--text-muted); }
.ai-status--success { color: var(--success-text); }
.ai-status--warning { color: var(--warning-text); }
.ai-danger-btn {
  color: var(--danger-text);
  border-color: var(--danger-bg);
}
.ai-danger-btn:hover {
  background: var(--danger-bg);
}
.ai-begin-btn {
  font-size: 17px;
  padding: 16px;
}
.ai-hint-chip {
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  color: var(--info-text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  line-height: 1.45;
}
.ai-lesson-advanced summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 0;
}
.ai-lesson-advanced > *:not(summary) {
  margin-top: 12px;
}

/* ── AI Lesson: next-focus banner ──────────────────────── */
.ai-next-focus-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--text);
}
/* The author display:flex above would otherwise beat the UA's [hidden] rule,
   leaving an empty banner bar visible even when JS sets .hidden = true. */
.ai-next-focus-banner[hidden] { display: none; }
.ai-next-focus-banner span {
  flex: 1;
  min-width: 0;
}
.ai-banner-apply-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.ai-banner-apply-btn:hover { opacity: 0.85; }
.ai-banner-dismiss-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 16px;
  padding: 2px 4px;
  line-height: 1;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.ai-banner-dismiss-btn:hover { color: var(--text); }

/* ── AI Lesson: autofill button ────────────────────────── */
.ai-autofill-btn {
  margin-top: 4px;
  align-self: flex-start;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.ai-autofill-btn:hover {
  background: var(--border);
  color: var(--text);
}

/* ── AI Lesson: session history ────────────────────────── */
.ai-badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 700;
  padding: 1px 7px;
  margin-left: 6px;
  vertical-align: middle;
}
.ai-empty-state {
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  padding: 16px 0;
  margin: 0;
}
.ai-session-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ai-session-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.ai-session-header {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: var(--surface);
  border: none;
  padding: 10px 14px;
  text-align: left;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  transition: background 0.15s;
}
.ai-session-header:hover { background: var(--bg); }
.ai-session-header[aria-expanded="true"] .ai-session-chevron { transform: rotate(90deg); }
.ai-session-date {
  font-size: 14px;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 80px;
}
.ai-session-topic {
  flex: 1;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ai-session-stars {
  font-size: 14px;
  color: #f5a623;
  white-space: nowrap;
}
.ai-session-chevron {
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1;
  transition: transform 0.2s;
}
.ai-session-detail {
  padding: 10px 14px 12px;
  background: var(--surface, #f9f9f9);
  border-top: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.6;
}
.ai-session-detail p { margin: 4px 0; }
.ai-session-detail strong { color: var(--text); }

.export-import-actions {
  margin-top: 12px;
  flex-wrap: wrap;
}
.export-import-actions .btn-check,
.export-import-actions .btn-secondary {
  flex: 1 1 auto;
  min-width: 120px;
}

/* ── App modal (replaces confirm/prompt: blocked in Android WebView) ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.modal-box {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 320px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.modal-message {
  font-size: 15px;
  color: var(--text);
  line-height: 1.5;
  margin: 0;
}
.modal-input {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.modal-input:focus { border-color: var(--primary); }
.modal-actions { display: flex; gap: 10px; }
.modal-actions button { flex: 1; }
.modal-confirm-btn--danger { background: var(--again) !important; }

@media (max-width: 480px) {
  .ai-field-grid {
    grid-template-columns: 1fr;
  }

  .grammar-examples,
  .grammar-examples tbody,
  .grammar-examples tr,
  .grammar-examples td {
    display: block;
    width: 100%;
  }

  .grammar-examples thead {
    display: none;
  }

  .grammar-examples tr {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
  }

  .grammar-examples tr:last-child {
    border-bottom: none;
  }

  .grammar-examples td {
    border-bottom: none;
    padding: 4px 0;
  }

  .grammar-examples td::before {
    display: block;
    margin-bottom: 2px;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
  }

  .grammar-examples td:nth-child(1)::before { content: "Неправильно"; }
  .grammar-examples td:nth-child(2)::before { content: "Правильно"; }
  .grammar-examples td:nth-child(3)::before { content: "Заметка"; }
}

/* ── Onboarding wizard ── */
.ob-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}
.ob-overlay[hidden] { display: none; }

.ob-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 460px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  max-height: 92vh;
  overflow-y: auto;
}

.ob-dots {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}
.ob-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.2s;
}
.ob-dot.active { background: var(--primary); }

.ob-body { min-height: 180px; }

.ob-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.ob-p {
  color: var(--text);
  line-height: 1.65;
  margin-top: 10px;
  font-size: 0.93rem;
}

.ob-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  align-items: center;
}
.ob-skip {
  margin-right: auto;
  font-size: 0.82rem;
  color: var(--text-muted);
  border: none;
  background: none;
  padding: 4px 0;
  cursor: pointer;
  flex-basis: 100%;
  order: 1;
}
.ob-actions #onboarding-prev { order: 2; }
.ob-actions #onboarding-next { order: 3; margin-left: auto; }
@media (min-width: 360px) {
  .ob-skip {
    flex-basis: auto;
    order: 0;
  }
  .ob-actions #onboarding-prev { order: 1; }
  .ob-actions #onboarding-next { order: 2; margin-left: 0; }
}

.ob-tone-guide {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}
.ob-tone-item {
  display: flex;
  gap: 12px;
  padding: 10px 12px;
  background: var(--bg);
  border-radius: 8px;
  align-items: flex-start;
}
.ob-tone-mark {
  font-size: 1.4rem;
  font-weight: 700;
  min-width: 64px;
  text-align: center;
  line-height: 1.2;
}
.ob-tone-body { flex: 1; }
.ob-tone-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 3px;
  line-height: 1.45;
}
.ob-tone-ex {
  font-size: 0.8rem;
  color: var(--primary);
  margin-top: 4px;
  font-family: monospace;
}

.ob-path {
  padding-left: 20px;
  margin-top: 12px;
}
.ob-path li {
  padding: 6px 0;
  line-height: 1.5;
  font-size: 0.92rem;
}

.ob-list {
  padding-left: 20px;
  margin-top: 12px;
}
.ob-list li {
  padding: 5px 0;
  line-height: 1.5;
  font-size: 0.92rem;
}
.ob-choice {
  display: block;
  width: 100%;
  margin-top: 14px;
}

/* ── Placement test view ───────────────────────────────── */
.placement-test-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 12px;
}
.placement-test-item:last-child { margin-bottom: 0; }
.placement-test-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.placement-test-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
}
.placement-recommended {
  border: 2px solid var(--primary);
}
.placement-more { margin-top: 12px; }
.placement-more summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 0;
}
.placement-more .placement-test-item { margin-top: 12px; }
.placement-level-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.placement-level-btn,
.placement-selfcheck-btn {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  white-space: normal;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.placement-level-btn:hover,
.placement-selfcheck-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.placement-selfcheck-btn {
  margin-top: 10px;
  font-weight: 400;
}
.placement-selfcheck-btn:first-of-type { margin-top: 14px; }
.placement-selfcheck summary {
  cursor: pointer;
}

/* Optional senior large-text mode — toggled in Ещё → Настройки */
body.large-text { font-size: 118%; }
body.large-text p,
body.large-text .card-subtitle,
body.large-text nav button,
body.large-text .skill-title,
body.large-text .skill-sub,
body.large-text .rating-btn,
body.large-text .mc-btn,
body.large-text .ai-output,
body.large-text .skill-start-btn,
body.large-text .btn-check,
body.large-text .btn-secondary { font-size: 1.12em; }
body.large-text .card-word { font-size: 34px; }
body.large-text .app-toast-text,
body.large-text .app-toast-btn { font-size: 1.1em; }

/* ── App toast bar (SW update / backup reminder) ──────────────
   Fixed to the bottom so it never covers the top nav; padded for the iOS
   home-indicator safe area. Large tap targets for a senior/low-literacy user. */
.app-toast {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  background: var(--surface);
  border-top: 1px solid var(--border);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.12);
  padding: 14px 16px calc(14px + env(safe-area-inset-bottom));
}
.app-toast-text {
  flex: 1 1 200px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.app-toast--nudge { border-top: 1px solid var(--warning-border); }
.app-toast--nudge .app-toast-text { color: var(--warning-text); }
.app-toast-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.app-toast-btn {
  min-height: 48px;
  min-width: 44px;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.app-toast-btn--primary {
  background: var(--primary);
  color: #fff;
  border: none;
}
.app-toast-btn--primary:hover { background: var(--primary-hover); }
.app-toast-btn--secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}
.app-toast-btn--secondary:hover { background: var(--border); }
@media (max-width: 400px) {
  .app-toast { padding: 12px 12px calc(12px + env(safe-area-inset-bottom)); }
  .app-toast-btn { padding: 10px 14px; }
}