/* ---------- Design tokens ---------- */
:root {
  --bg: #fdfbf7;
  --bg-elev: #ffffff;
  --text: #1d1b20;
  --text-muted: #5f5b66;
  --border: #e6e1d8;
  --primary: #ff6b35;
  --primary-hover: #e85a2a;
  --primary-ink: #ffffff;
  --accent: #4a90e2;
  --accent-soft: #e8f1fc;
  --success: #2ea043;
  --success-soft: #e6f6ea;
  --error: #d7263d;
  --error-soft: #fbe6e9;
  --warn: #f5a623;
  --shadow: 0 4px 14px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.10);
  --radius: 14px;
  --radius-sm: 8px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --bg: #15171c;
  --bg-elev: #1e2128;
  --text: #f2eee8;
  --text-muted: #a6a0b0;
  --border: #2c2f38;
  --primary: #ff8560;
  --primary-hover: #ff9c7c;
  --accent: #6fa8ea;
  --accent-soft: #23324a;
  --success-soft: #1e3a2a;
  --error-soft: #3a1f24;
  --shadow: 0 4px 14px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.55);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 18px; width: 100%; }

/* Safe-area padding for iOS PWA */
body { padding-top: env(safe-area-inset-top); padding-bottom: env(safe-area-inset-bottom); }

/* ---------- Header ---------- */
.app-header {
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 18px;
  flex-wrap: wrap;
}
.logo {
  font-size: 1.05rem;
  font-weight: 800;
  margin: 0;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  line-height: 1.1;
}
.logo-btn {
  background: none;
  border: 0;
  padding: 4px 8px;
  margin: -4px -8px;
  border-radius: 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: inherit;
  font: inherit;
  transition: background-color 0.18s ease, transform 0.12s ease;
}
.logo-btn:hover { background: rgba(120, 100, 160, 0.10); }
.logo-btn:active { transform: scale(0.97); }
.logo-btn:focus-visible {
  outline: 2px solid var(--accent, #5dc9bd);
  outline-offset: 2px;
}
.logo-emoji { font-size: 1.4rem; }
.logo-img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
  display: block;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
@media (max-width: 480px) {
  .logo-img { width: 28px; height: 28px; border-radius: 7px; }
}
.logo-text { display: inline-flex; flex-direction: column; }
.logo-line1 { font-size: 1rem; }
.logo-line2 {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent, #5dc9bd);
  letter-spacing: 0.01em;
}
@media (max-width: 480px) {
  .logo-line1 { font-size: 0.92rem; }
  .logo-line2 { font-size: 0.65rem; }
  .logo-emoji { font-size: 1.2rem; }
}
.header-controls { display: flex; gap: 8px; align-items: center; margin-left: auto; }

/* Google sign-in button in header */
.google-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px 7px 10px;
  border: 1px solid rgba(60, 64, 67, 0.18);
  border-radius: 999px;
  background: #fff;
  color: #1f1f1f;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(60, 64, 67, 0.08);
  transition: background-color 0.18s ease, box-shadow 0.18s ease, transform 0.12s ease;
  white-space: nowrap;
}
.google-btn:hover {
  background: #f8f9fa;
  box-shadow: 0 2px 6px rgba(60, 64, 67, 0.12);
}
.google-btn:active { transform: scale(0.97); }
.google-btn:focus-visible {
  outline: 2px solid #4285F4;
  outline-offset: 2px;
}
.google-logo {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.google-btn.signed-in {
  background: #e8f5e9;
  border-color: rgba(52, 168, 83, 0.45);
  color: #1b5e20;
}
.google-btn.signed-in:hover { background: #d6efd9; }

@media (max-width: 480px) {
  .google-btn-label { display: none; }
  .google-btn { padding: 7px 9px; }
}

/* Dark mode */
body.theme-dark .google-btn,
[data-theme="dark"] .google-btn {
  background: #2d2f33;
  color: #e8eaed;
  border-color: rgba(255,255,255,0.14);
}
body.theme-dark .google-btn:hover,
[data-theme="dark"] .google-btn:hover { background: #3a3d42; }
body.theme-dark .google-btn.signed-in,
[data-theme="dark"] .google-btn.signed-in {
  background: #1b3a23;
  border-color: rgba(105, 192, 134, 0.5);
  color: #b6e5c2;
}
.menu-wrap { position: relative; }
.menu-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  padding: 6px;
  display: none;
  z-index: 50;
}
.menu-dropdown.open { display: block; }
.menu-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text);
  padding: 10px 12px;
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
}
.menu-item:hover { background: var(--accent-soft); }
.dialect-switch select {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}
.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
}
.icon-btn:hover { background: var(--accent-soft); }

/* ---------- Views ---------- */
main { flex: 1; padding: 28px 0 48px; }
.view { display: none; }
.view.active { display: block; }
.hidden { display: none !important; }
.intro h2 { margin: 0 0 6px; font-size: 1.6rem; }
.intro p { margin: 0 0 24px; color: var(--text-muted); }

/* ---------- Sections list (Browse view) ---------- */
.section-group {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.section-group > summary {
  cursor: pointer;
  padding: 16px 20px;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 10px;
  list-style: none;
  background: linear-gradient(135deg, var(--accent-soft), transparent);
}
.section-group > summary::-webkit-details-marker { display: none; }
.section-group > summary::before {
  content: "▸";
  transition: transform 0.2s;
  color: var(--primary);
  font-size: 0.9rem;
}
.section-group[open] > summary::before { transform: rotate(90deg); }
.subsection {
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  --sub-hue: 20;
  --sub-bg: hsl(var(--sub-hue) 70% 96%);
  --sub-accent: hsl(var(--sub-hue) 65% 45%);
  --sub-emoji-bg: hsl(var(--sub-hue) 70% 92%);
  background: linear-gradient(to right, var(--sub-bg), transparent 35%);
  border-left: 4px solid var(--sub-accent);
}
[data-theme="dark"] .subsection {
  --sub-bg: hsl(var(--sub-hue) 40% 16%);
  --sub-accent: hsl(var(--sub-hue) 60% 60%);
  --sub-emoji-bg: hsl(var(--sub-hue) 35% 22%);
}
.subsection .subsection-id { background: var(--sub-accent); }
.subsection .subsection-pattern { color: var(--sub-accent); }
.subsection .verb-emoji { background: var(--sub-emoji-bg); }
.subsection .verb-card:hover { border-color: var(--sub-accent); }
.subsection .verb-form .vowel { color: var(--sub-accent); }
.subsection-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}
.subsection-id {
  background: var(--primary);
  color: var(--primary-ink);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.03em;
}
.subsection-pattern {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-weight: 700;
  color: var(--accent);
  font-size: 0.95rem;
}
.subsection-pattern s,
.study-hero-pattern s {
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  opacity: 0.6;
  font-style: italic;
}
.subsection-rule { color: var(--text-muted); font-size: 0.9rem; margin: 4px 0 14px; }

.verb-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.verb-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) auto minmax(0, 1.2fr);
  gap: 14px;
  align-items: center;
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
}
.verb-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}
.verb-emoji {
  font-size: 1.9rem;
  line-height: 1;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
}
.verb-form {
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background 0.12s;
  font-weight: 600;
  font-size: 1rem;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
.verb-form:hover { background: var(--accent-soft); }
.verb-form .vowel { color: var(--primary); font-weight: 800; }
.verb-cs {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-style: italic;
}
.verb-alt {
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-top: 2px;
}

/* ---------- Filter chips ---------- */
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 16px 0;
  max-height: 200px;
  overflow-y: auto;
  padding: 4px;
}
.chip {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.12s;
}
.chip:hover { border-color: var(--primary); }
.chip.active {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: var(--primary);
}
.chip.meta {
  background: var(--accent-soft);
  font-weight: 700;
}

/* ---------- Buttons ---------- */
.btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.12s;
}
.btn-primary { background: var(--primary); color: var(--primary-ink); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-secondary { background: var(--accent); color: white; }
.btn-secondary:hover { background: #3a7fd0; }
.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
  padding: 8px 0;
  margin-top: 16px;
}

/* ---------- Flashcards (flip cards grouped by section) ---------- */
.fc-toolbar {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-top: 12px;
  flex-wrap: wrap;
}
.fc-side-toggle select {
  margin-left: 8px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}
.fc-section-group { margin-bottom: 28px; }
.fc-section-title {
  margin: 24px 0 12px;
  font-size: 1.15rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-weight: 700;
}
.fc-sub {
  --sub-hue: 20;
  --sub-bg: hsl(var(--sub-hue) 70% 96%);
  --sub-accent: hsl(var(--sub-hue) 65% 45%);
  --sub-emoji-bg: hsl(var(--sub-hue) 70% 92%);
  background: linear-gradient(to right, var(--sub-bg), transparent 40%);
  border-left: 4px solid var(--sub-accent);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 14px;
}
[data-theme="dark"] .fc-sub {
  --sub-bg: hsl(var(--sub-hue) 40% 16%);
  --sub-accent: hsl(var(--sub-hue) 60% 60%);
  --sub-emoji-bg: hsl(var(--sub-hue) 35% 22%);
}
.fc-sub .subsection-id { background: var(--sub-accent); }
.fc-sub .subsection-pattern { color: var(--sub-accent); }
.fc-sub-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.fc-sub-rule { color: var(--text-muted); font-size: 0.85rem; flex-basis: 100%; margin-top: 2px; }

.fc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.flash-card {
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  perspective: 800px;
  aspect-ratio: 5 / 3;
  min-height: 120px;
  font-family: inherit;
  color: inherit;
}
.flash-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(.4,.05,.2,1);
  transform-style: preserve-3d;
}
.flash-card.flipped .flash-inner { transform: rotateY(180deg); }

.flash-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.flash-front { background: var(--sub-emoji-bg, var(--bg-elev)); }
.flash-back {
  transform: rotateY(180deg);
  background: var(--bg-elev);
  border-color: var(--sub-accent);
}
.flash-emoji { font-size: 2.4rem; line-height: 1; margin-bottom: 4px; }
.flash-cs {
  font-weight: 700;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text);
}
.flash-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 6px;
  font-style: italic;
}
.flash-forms {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-weight: 700;
  font-size: 1.05rem;
  text-align: center;
}
.flash-forms .vowel { color: var(--sub-accent); font-weight: 800; }
.flash-speak {
  position: absolute;
  top: 4px;
  right: 6px;
  font-size: 0.9rem;
}
.fc-progress {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  color: var(--text-muted);
  font-weight: 600;
}
.flashcard {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.fc-emoji { font-size: 4rem; margin-bottom: 8px; }
.fc-prompt { font-size: 1.8rem; font-weight: 700; margin-bottom: 20px; }
.fc-inputs {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 360px;
  margin: 0 auto 16px;
}
.fc-inputs input {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1.05rem;
  font-family: inherit;
  text-align: center;
  transition: border-color 0.15s;
}
.fc-inputs input:focus { outline: none; border-color: var(--primary); }
.fc-inputs input.correct { border-color: var(--success); background: var(--success-soft); }
.fc-inputs input.wrong { border-color: var(--error); background: var(--error-soft); }
.fc-inputs label {
  display: flex;
  flex-direction: column;
  text-align: left;
  font-size: 0.85rem;
  color: var(--text-muted);
  gap: 4px;
}
.fc-feedback {
  min-height: 1.5em;
  margin-bottom: 14px;
  font-weight: 600;
}
.fc-feedback.correct { color: var(--success); }
.fc-feedback.wrong { color: var(--error); }
.fc-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.flashcards-done { text-align: center; padding: 40px 20px; }

/* ---------- Quiz ---------- */
.quiz-options {
  display: flex;
  gap: 16px;
  margin: 16px 0;
  flex-wrap: wrap;
}
.quiz-options select {
  margin-left: 8px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}
.quiz-play { max-width: 640px; margin: 0 auto; }
.quiz-progress {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
}
.quiz-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 20px;
}
.quiz-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s ease;
  width: 0;
}
.quiz-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.quiz-card .q-emoji { font-size: 3rem; text-align: center; margin-bottom: 8px; }
.quiz-card .q-prompt { font-size: 1.2rem; font-weight: 700; text-align: center; margin-bottom: 18px; }
.quiz-card .q-hint { text-align: center; color: var(--text-muted); margin-bottom: 14px; font-size: 0.9rem; }
.quiz-options-list {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.quiz-option {
  padding: 12px 14px;
  border: 2px solid var(--border);
  background: var(--bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  text-align: left;
  transition: all 0.12s;
}
.quiz-option:hover:not(:disabled) {
  border-color: var(--primary);
  transform: translateY(-1px);
}
.quiz-option.correct { border-color: var(--success); background: var(--success-soft); }
.quiz-option.wrong { border-color: var(--error); background: var(--error-soft); }
.quiz-option:disabled { cursor: default; }
.quiz-fill-inputs { display: flex; flex-direction: column; gap: 4px; max-width: 460px; margin: 0 auto 14px; }
.quiz-fill-inputs:not(:has(.fill-row)) { flex-direction: row; flex-wrap: wrap; justify-content: center; }
.quiz-fill-inputs input {
  padding: 10px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  text-align: center;
  min-width: 140px;
}
/* Hide the right-side indicator for the correct case (the ✓ now lives inside the input) */
.fill-row .field-indicator.correct { display: none; }
.quiz-fill-inputs input.wrong { border-color: var(--error); background: var(--error-soft); }
.quiz-feedback { min-height: 1.5em; text-align: center; font-weight: 600; margin: 10px 0; }
.quiz-feedback.correct { color: var(--success); }
.quiz-feedback.wrong { color: var(--error); }
.quiz-next-row { display: flex; justify-content: center; margin-top: 12px; }

.quiz-done { text-align: center; padding: 40px 20px; }
.quiz-review {
  text-align: left;
  max-width: 600px;
  margin: 24px auto;
  display: grid;
  gap: 6px;
}
.review-item {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border-left: 4px solid var(--success);
  font-size: 0.95rem;
}
.review-item.wrong { border-left-color: var(--error); }
.review-item .q-text { font-weight: 600; }
.review-item .a-text { color: var(--text-muted); font-size: 0.88rem; margin-top: 2px; }

/* ---------- Footer ---------- */
.app-footer {
  border-top: 1px solid var(--border);
  padding: 16px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

/* ---------- Speak button ---------- */
.speak-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--accent);
  padding: 2px 4px;
  opacity: 0.6;
  transition: opacity 0.15s;
}
.speak-btn:hover { opacity: 1; }

/* ============================================================
   LESSON (guided 3-stage flow)
   ============================================================ */
.lesson-sec-title {
  grid-column: 1 / -1;
  margin: 28px 0 14px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent-soft) 0%, transparent 70%);
  border-left: 6px solid var(--primary);
  position: relative;
  overflow: hidden;
}
.lesson-sec-title:first-child { margin-top: 4px; }
.lesson-sec-title::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(255,107,53,0.10), transparent 60%);
  pointer-events: none;
}
.lesson-sec-emoji {
  font-size: 1.7rem;
  line-height: 1;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.55) 0%, rgba(255,255,255,0) 55%),
    linear-gradient(135deg, rgba(255, 122, 69, 0.85), rgba(255, 92, 138, 0.75));
  border: 1px solid rgba(255,255,255,0.5);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.55) inset,
    0 -1px 0 rgba(0,0,0,0.08) inset,
    0 6px 16px rgba(255, 90, 60, 0.35);
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
  flex-shrink: 0;
}
[data-theme="dark"] .lesson-sec-emoji {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.18) 0%, rgba(255,255,255,0) 55%),
    linear-gradient(135deg, rgba(255, 122, 69, 0.75), rgba(255, 92, 138, 0.65));
  border-color: rgba(255,255,255,0.18);
}
.lesson-sec-num {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--primary-ink);
  background: var(--primary);
  padding: 3px 10px;
  border-radius: 999px;
}
.lesson-sec-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  text-transform: none;
}
[data-theme="dark"] .lesson-sec-title {
  background: linear-gradient(135deg, hsl(20 30% 22%) 0%, transparent 70%);
}
#lesson-groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
  align-items: start;
}
.group-card {
  --sub-hue: 20;
  --sub-accent: hsl(var(--sub-hue) 65% 45%);
  --sub-bg: hsl(var(--sub-hue) 70% 96%);
  background: var(--sub-bg);
  border: 1px solid var(--border);
  border-left: 6px solid var(--sub-accent);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
  transition: transform 0.12s, box-shadow 0.12s;
  position: relative;
}
.group-card.group-card-mastered {
  border-left-color: hsl(45 90% 50%);
  box-shadow: 0 0 0 2px hsl(45 90% 50% / 0.35), 0 4px 14px hsl(45 90% 50% / 0.18);
  background: linear-gradient(135deg, hsl(45 95% 96%), var(--sub-bg) 60%);
}
[data-theme="dark"] .group-card.group-card-mastered {
  background: linear-gradient(135deg, hsl(45 60% 18%), var(--sub-bg) 60%);
  box-shadow: 0 0 0 2px hsl(45 90% 55% / 0.45), 0 4px 14px hsl(45 90% 55% / 0.22);
}
.group-medal {
  position: absolute;
  top: -10px;
  right: -8px;
  font-size: 1.6rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.25));
  animation: medal-bob 3.6s ease-in-out infinite;
  z-index: 2;
}
@keyframes medal-bob {
  0%, 100% { transform: translateY(0) rotate(-6deg); }
  50%      { transform: translateY(-3px) rotate(6deg); }
}
/* ----- Macro stats strip ----- */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 0 0 24px;
}
.stat-pill {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  overflow: hidden;
}
.stat-pill-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.stat-pill-icon { font-size: 1.4rem; line-height: 1; }
.stat-pill-num {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.stat-pill-of { font-size: 0.95rem; font-weight: 500; color: var(--text-muted); }
.stat-pill-label { font-size: 0.78rem; color: var(--text-muted); line-height: 1.3; }
.stat-pill-bar {
  height: 5px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.stat-pill-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}
.stat-pill-mastery .stat-pill-bar-fill { background: linear-gradient(90deg, hsl(140 65% 55%), hsl(160 70% 45%)); }
.stat-pill-groups  .stat-pill-bar-fill { background: linear-gradient(90deg, hsl(45 90% 55%),  hsl(30 90% 55%)); }
.stat-pill-streak {
  background: linear-gradient(135deg, hsl(20 95% 96%), var(--bg-elev) 70%);
}
[data-theme="dark"] .stat-pill-streak {
  background: linear-gradient(135deg, hsl(20 50% 18%), var(--bg-elev) 70%);
}
.stat-pill-streak.is-hot .stat-pill-icon {
  animation: flame-flicker 1.6s ease-in-out infinite;
  filter: drop-shadow(0 0 6px hsl(20 95% 60% / 0.6));
}
@keyframes flame-flicker {
  0%, 100% { transform: scale(1) rotate(-2deg); }
  50%      { transform: scale(1.08) rotate(2deg); }
}
@media (max-width: 600px) {
  .stats-strip { grid-template-columns: 1fr; gap: 8px; margin-bottom: 18px; }
  .stat-pill { flex-direction: row; align-items: center; padding: 10px 12px; }
  .stat-pill-head { flex: 0 0 auto; }
  .stat-pill-num { font-size: 1.3rem; }
  .stat-pill-label { flex: 1; text-align: right; font-size: 0.75rem; }
  .stat-pill-bar { display: none; }
}
[data-theme="dark"] .group-card {
  --sub-bg: hsl(var(--sub-hue) 40% 16%);
  --sub-accent: hsl(var(--sub-hue) 60% 60%);
}
.group-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.group-card-top { display: flex; gap: 10px; align-items: center; margin-bottom: 6px; flex-wrap: nowrap; min-width: 0; }
.group-card-top .subsection-id { flex-shrink: 0; }
.group-card-top .subsection-pattern {
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  flex: 1;
}
.group-card-top .subsection-pattern.is-small { font-size: 0.74rem; }
.group-card .subsection-id { background: var(--sub-accent); }
.group-card .subsection-pattern { color: var(--sub-accent); }
.group-card-rule { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 10px; }
.group-preview {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin: 8px 0 12px;
  max-height: 92px;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, #000 35%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 35%, transparent 100%);
  pointer-events: none;
}
.group-preview-verb {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 10px 2px 6px;
}
.group-preview-emoji { font-size: 0.95rem; line-height: 1; }
.group-preview-inf { font-weight: 600; color: var(--text); }
.group-card-meta {
  display: flex;
  gap: 6px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-left: 4px;
}
.dot.green { background: var(--success); }
.dot.yellow { background: var(--warn); }
.dot.red { background: var(--error); }

/* Active lesson */
.lesson-active {
  --sub-hue: 20;
  max-width: 640px;
  margin: 0 auto;
}
.lesson-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.lesson-group-label {
  flex: 1;
  font-weight: 700;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
.lesson-group-label .subsection-id { color: white; margin-right: 8px; }
.lesson-stage-dots { display: flex; gap: 6px; }
.stage-dot {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--border);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.85rem;
}
.stage-dot.active { background: var(--primary); color: var(--primary-ink); }
.stage-dot.done { background: var(--success); color: white; }

.lesson-progress { margin-bottom: 16px; }
.step-pills {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 0 4px;
}
.step-pills:empty { padding: 0; }
.step-pill {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text-muted);
  white-space: nowrap;
}
.step-pill.done {
  background: rgba(34, 197, 94, 0.14);
  border-color: rgba(34, 197, 94, 0.4);
  color: rgb(22, 130, 70);
}
.step-pill.active {
  background: hsl(var(--sub-hue, 20) 70% 55%);
  border-color: hsl(var(--sub-hue, 20) 70% 50%);
  color: white;
  box-shadow: 0 0 0 3px hsl(var(--sub-hue, 20) 70% 55% / 0.18);
}
.step-arrow {
  color: var(--text-muted);
  opacity: 0.6;
  font-size: 0.85rem;
}
.verb-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  padding: 6px 0 10px;
  min-height: 0;
}
.verb-chips:empty { padding: 0; }
.verb-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  font-size: 1rem;
  position: relative;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  border: 1.5px solid transparent;
  background: var(--bg-elev);
  cursor: default;
  user-select: none;
  line-height: 1;
}
.verb-chip.pending { opacity: 0.45; background: var(--bg-soft, var(--border)); }
.verb-chip.warn {
  opacity: 0.95;
  background: rgba(245, 158, 11, 0.15);
  border-color: rgba(245, 158, 11, 0.42);
}
.verb-chip.warn::after {
  content: '!';
  position: absolute;
  top: -5px;
  right: -5px;
  background: rgb(245, 158, 11);
  color: white;
  border-radius: 50%;
  width: 14px;
  height: 14px;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  line-height: 1;
}
.verb-chip.good {
  opacity: 1;
  background: rgba(34, 197, 94, 0.14);
  border-color: rgba(34, 197, 94, 0.4);
}
.verb-chip.done {
  opacity: 1;
  background: rgba(34, 197, 94, 0.28);
  border-color: rgba(34, 197, 94, 0.6);
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.28);
}
.verb-chip.done::after {
  content: '✓';
  position: absolute;
  top: -5px;
  right: -5px;
  background: rgb(34, 197, 94);
  color: white;
  border-radius: 50%;
  width: 14px;
  height: 14px;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  line-height: 1;
}
.verb-chip.current {
  opacity: 1;
  border-color: hsl(var(--sub-hue, 20) 70% 55%);
  box-shadow: 0 0 0 3px hsl(var(--sub-hue, 20) 70% 55% / 0.25);
  transform: scale(1.12);
  z-index: 2;
  animation: chip-pulse 1.6s ease-in-out infinite;
}
@keyframes chip-pulse {
  0%, 100% { box-shadow: 0 0 0 3px hsl(var(--sub-hue, 20) 70% 55% / 0.22); }
  50%      { box-shadow: 0 0 0 6px hsl(var(--sub-hue, 20) 70% 55% / 0.12); }
}
.verb-chip.just-cleared {
  animation: chip-cleared 0.7s ease-out;
}
@keyframes chip-cleared {
  0%   { transform: scale(1); }
  35%  { transform: scale(1.45); box-shadow: 0 0 24px 8px rgba(34, 197, 94, 0.55); }
  70%  { transform: scale(0.96); }
  100% { transform: scale(1); }
}
@media (max-width: 600px) {
  .verb-chip { width: 30px; height: 30px; font-size: 0.92rem; }
}
.lesson-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 6px;
}
.lesson-bar-fill {
  height: 100%;
  background: hsl(var(--sub-hue) 65% 50%);
  transition: width 0.3s ease;
  width: 0;
}
.lesson-meta { font-size: 0.85rem; color: var(--text-muted); }

.lesson-stage-intro {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stage-intro-emoji { font-size: 3rem; margin-bottom: 8px; }
.lesson-stage-intro h3 { margin: 0 0 6px; }
.lesson-stage-intro p { color: var(--text-muted); margin: 0 0 18px; }

/* Question card (used in lesson stages) */
.q-card {
  --sub-hue: 20;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 4px solid hsl(var(--sub-hue) 65% 50%);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow);
}
.q-card .q-emoji { font-size: 2.8rem; text-align: center; margin-bottom: 4px; }
.q-card .q-prompt {
  font-size: 1.3rem;
  font-weight: 800;
  text-align: center;
  margin: 0 auto 8px;
  max-width: 460px;
  padding: 5px 22px;
  border-radius: 12px;
  background: hsl(var(--sub-hue, 20) 75% 95%);
  border: 1.5px solid hsl(var(--sub-hue, 20) 65% 55%);
  color: hsl(var(--sub-hue, 20) 70% 28%);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 2px 8px hsl(var(--sub-hue, 20) 65% 50% / 0.12);
}
[data-theme="dark"] .q-card .q-prompt {
  background: hsl(var(--sub-hue, 20) 40% 18%);
  color: hsl(var(--sub-hue, 20) 65% 82%);
  border-color: hsl(var(--sub-hue, 20) 60% 55%);
}
.q-card .q-sub { text-align: center; color: var(--text-muted); margin-bottom: 14px; font-size: 0.9rem; }
.q-card .q-feedback { min-height: 0; text-align: center; margin: 8px 0 0; font-weight: 600; font-size: 0.88rem; line-height: 1.3; }
.q-card .q-feedback:empty { display: none; }
.q-card .q-feedback.correct { color: var(--success); }
.q-card .q-feedback.wrong { color: var(--error); }
.q-card .q-actions { display: flex; justify-content: center; margin-top: 14px; }
.q-card .next-btn { margin-top: 12px; display: inline-block; margin: 14px auto 0; }
.q-card .quiz-options-list {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
}
.q-card .streak-indicator {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.q-card .streak-indicator strong { color: var(--primary); font-size: 1rem; }

.round-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.round-pill {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.round-pill.active {
  background: hsl(var(--sub-hue) 65% 50%);
  border-color: hsl(var(--sub-hue) 65% 50%);
  color: white;
}
.round-pill.done {
  background: var(--success-soft);
  border-color: var(--success);
  color: var(--success);
}
.round-arrow { color: var(--text-muted); font-weight: 700; }
.round-progress { font-family: "SF Mono", Menlo, Consolas, monospace; font-weight: 700; }

.enter-tip {
  text-align: center;
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}
@media (max-width: 600px) {
  .enter-tip { margin-bottom: 4px; font-size: 0.72rem; }
}
.enter-tip kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.72rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  color: var(--text);
}

.fill-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.fill-row input { flex: 1; min-width: 0; }
.fill-row.has-aura {
  position: relative;
  border-radius: 12px;
  padding: 4px;
  margin-left: -4px;
  margin-right: -4px;
  background: radial-gradient(ellipse at center, rgba(74,144,226,0.18), rgba(74,144,226,0.02) 70%);
  box-shadow: 0 0 0 1px rgba(74,144,226,0.25), 0 0 14px rgba(74,144,226,0.28);
  animation: aura-pulse 2.4s ease-in-out infinite;
}
.fill-row.has-aura input:not(.correct):not(.wrong) {
  border-color: rgba(74,144,226,0.45);
}
@keyframes aura-pulse {
  0%, 100% { box-shadow: 0 0 0 1px rgba(74,144,226,0.25), 0 0 14px rgba(74,144,226,0.28); }
  50%      { box-shadow: 0 0 0 1px rgba(74,144,226,0.35), 0 0 22px rgba(74,144,226,0.42); }
}
.field-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
  min-width: 0;
}
.field-indicator:empty { display: none; }
.field-indicator .fi-icon {
  display: inline-grid;
  place-items: center;
  width: 24px; height: 24px;
  border-radius: 50%;
  font-size: 0.95rem;
  flex-shrink: 0;
  animation: fi-pop 0.3s cubic-bezier(.34,1.56,.64,1);
}
@keyframes fi-pop {
  0% { transform: scale(0); }
  100% { transform: scale(1); }
}
.field-indicator.correct .fi-icon {
  background: var(--success);
  color: white;
}
.field-indicator.wrong .fi-icon {
  background: var(--error);
  color: white;
}
.field-indicator .fi-correct {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  background: var(--success-soft);
  color: var(--success);
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .fill-row { flex-wrap: wrap; }
  .field-indicator { width: 100%; padding-left: 4px; }
}

.sentence {
  font-size: 1.2rem;
  text-align: center;
  line-height: 2;
  margin: 14px 0;
}
.sentence-blank {
  border: none;
  border-bottom: 2px solid var(--primary);
  background: transparent;
  padding: 2px 8px;
  font-size: 1.1rem;
  min-width: 120px;
  text-align: center;
  font-family: inherit;
  color: var(--text);
}
.sentence-blank:focus { outline: none; background: var(--accent-soft); }
.sentence-blank.correct { border-color: var(--success); background: var(--success-soft); }
.sentence-blank.wrong { border-color: var(--error); background: var(--error-soft); }

/* Results */
.lesson-results { max-width: 640px; margin: 0 auto; text-align: center; }
.lesson-results h2 { margin-top: 20px; }
.results-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 20px 0;
}
.stat {
  padding: 16px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
}
.stat-num { font-size: 2rem; font-weight: 800; }
.stat-label { font-size: 0.85rem; color: var(--text-muted); }
.stat-green { border-top: 4px solid var(--success); }
.stat-yellow { border-top: 4px solid var(--warn); }
.stat-red { border-top: 4px solid var(--error); }
.results-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 12px 0 20px;
  text-align: left;
}
.result-row {
  display: grid;
  grid-template-columns: 32px 1fr auto 14px;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}
.result-row.green { border-left: 4px solid var(--success); }
.result-row.yellow { border-left: 4px solid var(--warn); }
.result-row.red { border-left: 4px solid var(--error); }
.result-row .cs { color: var(--text-muted); font-size: 0.8rem; }
.result-row .emoji { font-size: 1.4rem; }
.status-dot.green { background: var(--success); }
.status-dot.yellow { background: var(--warn); }
.status-dot.red { background: var(--error); }
.results-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

/* ---------- Study view (Lesson Stage 1) ---------- */
.study-view {
  --sub-accent: hsl(var(--sub-hue) 65% 45%);
  --sub-bg: hsl(var(--sub-hue) 70% 96%);
  --sub-bg-strong: hsl(var(--sub-hue) 75% 88%);
  --sub-emoji-bg: hsl(var(--sub-hue) 70% 92%);
}
[data-theme="dark"] .study-view {
  --sub-bg: hsl(var(--sub-hue) 40% 16%);
  --sub-bg-strong: hsl(var(--sub-hue) 45% 24%);
  --sub-accent: hsl(var(--sub-hue) 60% 60%);
  --sub-emoji-bg: hsl(var(--sub-hue) 35% 22%);
}

/* Hero header */
.study-hero {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  background: linear-gradient(135deg, var(--sub-bg-strong) 0%, var(--sub-bg) 100%);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 18px;
  overflow: hidden;
  box-shadow: 0 6px 20px hsl(var(--sub-hue) 50% 50% / 0.12);
}
.study-hero::before {
  content: "";
  position: absolute;
  top: -40px; right: -40px;
  width: 180px; height: 180px;
  background: radial-gradient(circle, var(--sub-accent) 0%, transparent 70%);
  opacity: 0.15;
  pointer-events: none;
}
.study-hero-pattern {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--sub-accent);
  background: var(--bg-elev);
  border: 2px solid var(--sub-accent);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 12px hsl(var(--sub-hue) 50% 50% / 0.2);
}
.study-hero-text { min-width: 0; }
.study-hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sub-accent);
  margin-bottom: 4px;
}
.study-hero-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.2;
}
.study-hero-sub {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.4;
}
.study-hero-vowel {
  color: var(--sub-accent);
  font-weight: 700;
  border-bottom: 2px dashed var(--sub-accent);
}
.study-hero-count {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--sub-accent);
  line-height: 1;
}
.study-hero-count span {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 4px;
}

/* List of verbs */
.study-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 22px;
}
.study-row {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 14px 8px 10px;
  display: grid;
  grid-template-columns: 28px 56px 1fr auto;
  grid-template-areas:
    "num emoji forms speak"
    "num cs    forms speak";
  column-gap: 10px;
  row-gap: 2px;
  align-items: center;
  box-shadow: var(--shadow);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
  animation: study-row-in 0.4s cubic-bezier(.4,.05,.2,1) both;
  animation-delay: calc(var(--row-i, 0) * 50ms);
  overflow: hidden;
}
@keyframes study-row-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.study-row::before {
  content: "";
  position: absolute;
  left: -1px; top: -1px; bottom: -1px;
  width: 4px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: var(--sub-accent);
}
.study-row:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--sub-accent);
}
.study-num {
  grid-area: num;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--sub-bg);
  color: var(--sub-accent);
  font-weight: 800;
  font-size: 0.78rem;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
.study-emoji {
  grid-area: emoji;
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: var(--sub-emoji-bg);
  border-radius: var(--radius-sm);
  font-size: 1.55rem;
  line-height: 1;
}
.study-forms {
  grid-area: forms;
  display: flex;
  align-items: stretch;
  gap: 6px;
  flex-wrap: wrap;
  min-width: 0;
}
.study-form {
  display: flex;
  flex-direction: column;
  gap: 0;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  transition: background 0.12s, border-color 0.12s;
  min-width: 0;
}
.study-form:hover {
  background: var(--sub-bg);
  border-color: var(--sub-accent);
}
.study-form-label {
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  line-height: 1.3;
}
.study-form-word {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
}
.study-form-word .vowel {
  color: var(--sub-accent);
  font-weight: 800;
  background: hsl(var(--sub-hue) 70% 92% / 0.6);
  padding: 0 2px;
  border-radius: 3px;
}
[data-theme="dark"] .study-form-word .vowel {
  background: hsl(var(--sub-hue) 40% 30% / 0.7);
}
.study-arrow {
  align-self: center;
  color: var(--sub-accent);
  font-weight: 700;
  font-size: 0.95rem;
  opacity: 0.7;
}
.study-speak {
  grid-area: speak;
  font-size: 1.2rem;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--sub-bg);
  border: 1px solid transparent;
}
.study-speak:hover { background: var(--sub-accent); color: white; }
.study-cs {
  grid-area: cs;
  text-align: center;
  color: var(--sub-accent);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-top: 2px;
  line-height: 1.15;
}

/* Action button */
.study-actions {
  display: flex;
  justify-content: center;
  padding: 10px 0 30px;
}
.study-done-btn {
  font-size: 1.05rem;
  padding: 14px 28px;
  box-shadow: 0 6px 20px hsl(var(--sub-hue) 50% 50% / 0.3);
}
.study-done-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px hsl(var(--sub-hue) 50% 50% / 0.4);
}

@media (max-width: 640px) {
  .study-hero {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "pattern count"
      "text    text";
    gap: 12px;
    padding: 18px 16px;
  }
  .study-hero-pattern { grid-area: pattern; font-size: 1.1rem; padding: 8px 12px; }
  .study-hero-text { grid-area: text; }
  .study-hero-count { grid-area: count; font-size: 1.8rem; flex-direction: row; gap: 6px; align-items: baseline; }
  .study-hero-count span { font-size: 0.65rem; margin-top: 0; }
  .study-hero-title { font-size: 1.15rem; }
  .study-hero-sub { font-size: 0.85rem; }
  .study-row {
    grid-template-columns: 28px 56px 1fr auto;
    padding: 10px 14px 10px 10px;
  }
  .study-num { width: 26px; height: 26px; font-size: 0.75rem; }
  .study-emoji { width: 50px; height: 50px; font-size: 1.6rem; }
  .study-cs { font-size: 0.78rem; }
  .study-forms { gap: 4px; }
  .study-form { padding: 3px 7px; }
  .study-form-label { font-size: 0.55rem; }
  .study-form-word { font-size: 0.92rem; }
  .study-arrow { display: none; }
  .study-speak { width: 32px; height: 32px; font-size: 1rem; }
}

/* ---------- Mezifáze (Mark hard verbs) ---------- */
.mark-view { --mark-color: #4a90e2; }
.mark-hero {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 18px 20px;
  margin-bottom: 16px;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(74, 144, 226, 0.18) 0%, rgba(124, 108, 232, 0.14) 100%);
  border: 1px solid rgba(74, 144, 226, 0.3);
  box-shadow: 0 6px 20px rgba(74, 144, 226, 0.15);
  overflow: hidden;
}
.mark-hero::before {
  content: "";
  position: absolute;
  top: -40px; right: -40px;
  width: 180px; height: 180px;
  background: radial-gradient(circle, var(--mark-color) 0%, transparent 70%);
  opacity: 0.18;
  pointer-events: none;
}
.mark-hero-emoji { font-size: 2.4rem; line-height: 1; }
.mark-hero-text { min-width: 0; }
.mark-hero-title {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
  color: var(--text);
}
.mark-hero-sub { font-size: 0.9rem; color: var(--text-muted); line-height: 1.4; }
.mark-hero-sub strong { color: var(--mark-color); }
.mark-counter {
  display: grid;
  place-items: center;
  min-width: 52px;
  height: 52px;
  padding: 0 14px;
  border-radius: 16px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.4), rgba(255,255,255,0)),
    linear-gradient(135deg, #5fa3f0, #7c6ce8);
  color: white;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-weight: 800;
  font-size: 1.6rem;
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 6px 16px rgba(74, 144, 226, 0.35);
}

/* Mark rows — buttons styled like study-row but clickable + mark state */
.mark-row {
  font-family: inherit;
  color: inherit;
  cursor: pointer;
  text-align: left;
  display: grid;
  grid-template-columns: 36px 56px 1fr auto;
  grid-template-areas:
    "chk emoji forms forms"
    "chk emoji cs    cs";
  column-gap: 10px;
  row-gap: 2px;
  align-items: center;
  padding: 8px 14px 8px 10px;
  border-radius: var(--radius);
  transition: transform 0.16s, box-shadow 0.16s, border-color 0.16s, background 0.16s;
}
.mark-row:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.mark-row .mark-checkbox {
  grid-area: chk;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 2px solid rgba(74, 144, 226, 0.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset;
  transition: all 0.18s;
}
.mark-row .mark-check {
  font-size: 1rem;
  font-weight: 900;
  color: white;
  opacity: 0;
  transform: scale(0.4);
  transition: all 0.18s cubic-bezier(.34,1.56,.64,1);
}
.mark-row .study-emoji { grid-area: emoji; }
.mark-row .study-forms { grid-area: forms; gap: 8px; }
.mark-row .study-cs { grid-area: cs; text-align: left; padding-left: 4px; }
.mark-row .study-form-word { font-size: 0.95rem; }

/* Marked state — strong blue tint */
.mark-row.is-marked {
  background:
    linear-gradient(135deg, rgba(74, 144, 226, 0.22) 0%, rgba(124, 108, 232, 0.16) 100%),
    var(--glass-bg);
  border-color: rgba(74, 144, 226, 0.55);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.5) inset,
    0 0 0 2px rgba(74, 144, 226, 0.2),
    0 8px 22px rgba(74, 144, 226, 0.25);
}
.mark-row.is-marked .mark-checkbox {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.4), rgba(255,255,255,0)),
    linear-gradient(135deg, #5fa3f0, #7c6ce8);
  border-color: rgba(255,255,255,0.5);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 4px 10px rgba(74, 144, 226, 0.45);
}
.mark-row.is-marked .mark-check { opacity: 1; transform: scale(1); }
.mark-row.is-marked .study-cs { color: var(--mark-color); }
.mark-row.is-marked::before {
  background: linear-gradient(180deg, #5fa3f0, #7c6ce8) !important;
}

/* Stage dot for Mezifáze (★) */
.stage-dot.stage-dot-mark {
  font-size: 0.85rem;
}
.stage-dot.stage-dot-mark.active {
  background: linear-gradient(135deg, #5fa3f0, #7c6ce8);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 4px 12px rgba(74, 144, 226, 0.40);
}

@media (max-width: 640px) {
  .mark-hero {
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "emoji counter"
      "text  text";
    gap: 12px;
    padding: 14px 16px;
  }
  .mark-hero-emoji { grid-area: emoji; }
  .mark-hero-text { grid-area: text; }
  .mark-counter { grid-area: counter; min-width: 44px; height: 44px; font-size: 1.2rem; }
  .mark-hero-title { font-size: 1.1rem; }
  .mark-hero-sub { font-size: 0.82rem; }
  .mark-row { grid-template-columns: 28px 50px 1fr; }
  .mark-row .mark-checkbox { width: 26px; height: 26px; }
}

/* ---------- Swipe flashcards (Lesson Stage 1) ---------- */
.swipe-stage {
  --sub-accent: hsl(var(--sub-hue) 65% 50%);
  --sub-bg: hsl(var(--sub-hue) 70% 96%);
  --sub-emoji-bg: hsl(var(--sub-hue) 70% 92%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 10px 0 20px;
  user-select: none;
  -webkit-user-select: none;
}
[data-theme="dark"] .swipe-stage {
  --sub-bg: hsl(var(--sub-hue) 40% 16%);
  --sub-accent: hsl(var(--sub-hue) 60% 60%);
  --sub-emoji-bg: hsl(var(--sub-hue) 35% 22%);
}
.swipe-hints {
  display: flex;
  justify-content: space-between;
  width: 100%;
  max-width: 360px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.swipe-hint.left { color: var(--error); }
.swipe-hint.right { color: var(--success); }

.swipe-card {
  position: relative;
  width: min(360px, 90vw);
  aspect-ratio: 4 / 5;
  perspective: 1000px;
  cursor: grab;
  touch-action: pan-y;
  transition: transform 0.25s cubic-bezier(.4,.05,.2,1), opacity 0.25s;
  outline: none;
}
.swipe-card:focus-visible { box-shadow: 0 0 0 3px var(--accent-soft); border-radius: var(--radius); }
.swipe-card.dragging { transition: none; cursor: grabbing; }
.swipe-card.committing { pointer-events: none; }

.swipe-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(.4,.05,.2,1);
  transform-style: preserve-3d;
}
.swipe-card.flipped .swipe-inner { transform: rotateY(180deg); }

.swipe-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 22px 18px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.swipe-front {
  background: var(--sub-emoji-bg);
  border-color: var(--sub-accent);
}
.swipe-back {
  transform: rotateY(180deg);
  background: var(--bg-elev);
  border: 2px solid var(--sub-accent);
}
.swipe-emoji { font-size: 4.2rem; line-height: 1; margin-bottom: 14px; }
.swipe-cs {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  margin: 0;
}
.swipe-flip-hint {
  position: absolute;
  bottom: 10px;
  left: 0; right: 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
}
.swipe-forms {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-weight: 700;
  font-size: 1.25rem;
}
.swipe-forms .vowel { color: var(--sub-accent); font-weight: 800; }
.swipe-forms .speak-btn { margin-left: 6px; font-size: 0.9rem; }
.swipe-inf { font-size: 1.35rem; color: var(--sub-accent); }

.swipe-badge {
  position: absolute;
  top: 22px;
  padding: 6px 14px;
  border: 3px solid;
  border-radius: 8px;
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  opacity: var(--badge-opacity, 0);
  transition: opacity 0.1s;
  pointer-events: none;
  transform: rotate(-12deg);
  z-index: 2;
}
.swipe-badge.left-badge {
  left: 18px;
  color: var(--error);
  border-color: var(--error);
  background: rgba(215, 38, 61, 0.08);
}
.swipe-badge.right-badge {
  right: 18px;
  color: var(--success);
  border-color: var(--success);
  background: rgba(46, 160, 67, 0.08);
  transform: rotate(12deg);
}
.swipe-card.swiping-left .left-badge { --badge-opacity: 1; }
.swipe-card.swiping-right .right-badge { --badge-opacity: 1; }

.swipe-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 4px;
}
.swipe-btn {
  min-width: 130px;
  font-weight: 700;
}
.swipe-btn-no {
  background: var(--error-soft);
  color: var(--error);
  border: 1px solid var(--error);
}
.swipe-btn-no:hover { background: var(--error); color: white; }
.swipe-btn-yes {
  background: var(--success-soft);
  color: var(--success);
  border: 1px solid var(--success);
}
.swipe-btn-yes:hover { background: var(--success); color: white; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .header-inner { gap: 10px; padding: 10px 14px; }
  .logo { font-size: 1rem; flex: 1; }
  .main-nav { order: 3; width: 100%; }
  .nav-btn { padding: 6px 12px; font-size: 0.85rem; flex: 1; }
  .intro h2 { font-size: 1.3rem; }
  .fc-prompt { font-size: 1.4rem; }
  .verb-card {
    grid-template-columns: 40px repeat(3, minmax(0, 1fr)) auto;
    gap: 8px;
    padding: 8px 10px;
  }
  .verb-emoji { width: 36px; height: 36px; font-size: 1.5rem; }
  .verb-cs { grid-column: 2 / -1; font-size: 0.8rem; margin-top: -2px; }
  .verb-form { font-size: 0.9rem; padding: 1px 3px; }
}

/* ============================================================
   LIQUID GLASS THEME
   Apple iOS 26 / macOS Tahoe inspired
   Translucent surfaces · backdrop blur · specular highlights
   ============================================================ */

:root {
  --glass-bg:        rgba(255, 255, 255, 0.55);
  --glass-bg-strong: rgba(255, 255, 255, 0.72);
  --glass-bg-soft:   rgba(255, 255, 255, 0.32);
  --glass-bg-tint:   rgba(255, 255, 255, 0.18);
  --glass-border:    rgba(255, 255, 255, 0.55);
  --glass-border-d:  rgba(255, 255, 255, 0.25);
  --glass-blur:      blur(22px) saturate(180%);
  --glass-blur-lg:   blur(40px) saturate(200%);
  --glass-shine: linear-gradient(180deg,
                  rgba(255,255,255,0.55) 0%,
                  rgba(255,255,255,0.10) 28%,
                  rgba(255,255,255,0.00) 50%);
  --glass-shadow:
    0 1px 0 rgba(255,255,255,0.65) inset,
    0 -1px 0 rgba(0,0,0,0.04) inset,
    0 12px 32px rgba(40, 24, 80, 0.10),
    0 4px 12px rgba(40, 24, 80, 0.06);
  --glass-shadow-lg:
    0 1px 0 rgba(255,255,255,0.7) inset,
    0 -1px 0 rgba(0,0,0,0.05) inset,
    0 24px 60px rgba(40, 24, 80, 0.18),
    0 8px 20px rgba(40, 24, 80, 0.10);
  --radius:    20px;
  --radius-sm: 14px;
  --bg: transparent;
  --bg-elev: var(--glass-bg);
  --border: var(--glass-border);
  --shadow: var(--glass-shadow);
  --shadow-lg: var(--glass-shadow-lg);
}

[data-theme="dark"] {
  --glass-bg:        rgba(36, 32, 50, 0.55);
  --glass-bg-strong: rgba(48, 42, 65, 0.72);
  --glass-bg-soft:   rgba(28, 24, 40, 0.32);
  --glass-bg-tint:   rgba(255, 255, 255, 0.05);
  --glass-border:    rgba(255, 255, 255, 0.14);
  --glass-border-d:  rgba(255, 255, 255, 0.06);
  --glass-shine: linear-gradient(180deg,
                  rgba(255,255,255,0.16) 0%,
                  rgba(255,255,255,0.04) 28%,
                  rgba(255,255,255,0.00) 50%);
  --glass-shadow:
    0 1px 0 rgba(255,255,255,0.10) inset,
    0 -1px 0 rgba(0,0,0,0.30) inset,
    0 12px 32px rgba(0, 0, 0, 0.45),
    0 4px 12px rgba(0, 0, 0, 0.30);
  --glass-shadow-lg:
    0 1px 0 rgba(255,255,255,0.12) inset,
    0 -1px 0 rgba(0,0,0,0.35) inset,
    0 24px 60px rgba(0, 0, 0, 0.55),
    0 8px 20px rgba(0, 0, 0, 0.35);
  --bg-elev: var(--glass-bg);
  --border: var(--glass-border);
}

/* Vibrant gradient mesh background — what the glass refracts */
body {
  background:
    radial-gradient(ellipse 70% 55% at 8% -5%,  hsla(20, 95%, 68%, 0.45), transparent 55%),
    radial-gradient(ellipse 55% 65% at 95% 15%, hsla(210, 95%, 68%, 0.42), transparent 55%),
    radial-gradient(ellipse 60% 50% at 50% 110%, hsla(285, 80%, 72%, 0.35), transparent 55%),
    radial-gradient(ellipse 45% 55% at 85% 80%, hsla(155, 80%, 62%, 0.30), transparent 55%),
    radial-gradient(ellipse 50% 50% at 15% 60%, hsla(45, 95%, 70%, 0.28), transparent 55%),
    linear-gradient(180deg, #fef9f2 0%, #f3edfb 60%, #eef6fb 100%);
  background-attachment: fixed;
  color: var(--text);
}
[data-theme="dark"] body {
  background:
    radial-gradient(ellipse 70% 55% at 8% -5%,  hsla(20, 70%, 38%, 0.55), transparent 55%),
    radial-gradient(ellipse 55% 65% at 95% 15%, hsla(210, 70%, 32%, 0.55), transparent 55%),
    radial-gradient(ellipse 60% 50% at 50% 110%, hsla(285, 60%, 30%, 0.45), transparent 55%),
    radial-gradient(ellipse 45% 55% at 85% 80%, hsla(155, 60%, 25%, 0.40), transparent 55%),
    linear-gradient(180deg, #14111d 0%, #181426 60%, #121826 100%);
  background-attachment: fixed;
}

/* ----- Header ----- */
.app-header {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur-lg);
  backdrop-filter: var(--glass-blur-lg);
  border-bottom: 1px solid var(--glass-border-d);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 4px 20px rgba(40, 24, 80, 0.06);
}
[data-theme="dark"] .app-header {
  box-shadow: 0 1px 0 rgba(255,255,255,0.08) inset, 0 4px 20px rgba(0,0,0,0.4);
}

.menu-dropdown {
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: var(--glass-blur-lg);
  backdrop-filter: var(--glass-blur-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow-lg);
  border-radius: var(--radius);
  padding: 8px;
}
.menu-item:hover { background: rgba(74, 144, 226, 0.15); }

.icon-btn,
.dialect-switch select,
.quiz-options select,
.fc-side-toggle select {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 2px 8px rgba(40,24,80,0.06);
  transition: all 0.18s;
}
.icon-btn:hover {
  background: var(--glass-bg-strong);
  transform: translateY(-1px);
}
.dialect-switch select { padding: 7px 12px; }

/* ----- Generic glass surface utility ----- */
.section-group,
.group-card,
.q-card,
.lesson-stage-intro,
.flashcard,
.quiz-card,
.review-item,
.stat,
.fc-sub,
.study-hero,
.study-row,
.lesson-sec-title,
.app-footer {
  background:
    var(--glass-shine),
    var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius);
}

/* Hovering surfaces lift gently */
.group-card:hover,
.flash-card:hover .flash-face,
.review-item:hover {
  background: var(--glass-shine), var(--glass-bg-strong);
  box-shadow: var(--glass-shadow-lg);
}

/* Section group (browse) — keep slightly larger radius */
.section-group {
  overflow: hidden;
}
.section-group > summary {
  background: linear-gradient(135deg, rgba(255,255,255,0.4) 0%, transparent 60%);
}

/* Subsection (browse) — inner glass with section tint */
.subsection {
  background:
    linear-gradient(135deg, hsla(var(--sub-hue), 80%, 75%, 0.18) 0%, transparent 50%),
    var(--glass-bg-soft);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-border-d);
  border-left: 4px solid hsla(var(--sub-hue), 70%, 55%, 0.7);
}

/* Verb cards */
.verb-card {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-d);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset, 0 2px 6px rgba(40,24,80,0.04);
}
.verb-card:hover {
  background: var(--glass-bg-strong);
  border-color: hsla(var(--sub-hue, 20), 70%, 55%, 0.5);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 8px 20px rgba(40,24,80,0.10);
  transform: translateY(-2px);
}

.verb-emoji,
.study-emoji {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.5) 0%, rgba(255,255,255,0) 60%),
    hsla(var(--sub-hue, 20), 70%, 80%, 0.55);
  border: 1px solid rgba(255,255,255,0.5);
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 4px 10px rgba(40,24,80,0.08);
  border-radius: var(--radius-sm);
}
/* Inline (text-flow) emojis don't get the box treatment */
.q-card .q-emoji,
.flashcard .fc-emoji,
.quiz-card .q-emoji { background: none; border: none; box-shadow: none; padding: 0; }
[data-theme="dark"] .verb-emoji,
[data-theme="dark"] .study-emoji {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.10) 0%, rgba(255,255,255,0) 60%),
    hsla(var(--sub-hue, 20), 50%, 35%, 0.55);
  border-color: rgba(255,255,255,0.12);
}

/* ----- Buttons ----- */
.btn {
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform 0.16s, box-shadow 0.16s, background 0.16s;
}
.btn-primary {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.35) 0%, rgba(255,255,255,0) 50%),
    linear-gradient(135deg, #ff7a45 0%, #ff5c8a 100%);
  color: white;
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.45) inset,
    0 -1px 0 rgba(0,0,0,0.10) inset,
    0 8px 22px rgba(255, 90, 60, 0.35),
    0 2px 6px rgba(255, 90, 60, 0.20);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.5) inset,
    0 -1px 0 rgba(0,0,0,0.10) inset,
    0 14px 32px rgba(255, 90, 60, 0.45),
    0 4px 10px rgba(255, 90, 60, 0.25);
}
.btn-secondary {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.35) 0%, rgba(255,255,255,0) 50%),
    linear-gradient(135deg, #5fa3f0 0%, #7c6ce8 100%);
  color: white;
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.45) inset,
    0 8px 22px rgba(74, 144, 226, 0.30);
}
.btn-ghost {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 2px 8px rgba(40,24,80,0.06);
}
.btn-ghost:hover {
  background: var(--glass-bg-strong);
  color: var(--text);
  border-color: var(--glass-border);
}

/* ----- Inputs ----- */
.fc-inputs input,
.quiz-fill-inputs input,
.sentence-blank {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1.5px solid var(--glass-border-d);
  border-radius: 14px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 2px 6px rgba(40,24,80,0.05);
  transition: all 0.18s;
}
.fc-inputs input:focus,
.quiz-fill-inputs input:focus,
.sentence-blank:focus {
  outline: none;
  border-color: rgba(255, 122, 69, 0.7);
  background: var(--glass-bg-strong);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.5) inset,
    0 0 0 4px rgba(255, 122, 69, 0.18),
    0 4px 14px rgba(255, 90, 60, 0.18);
}
.fc-inputs input.correct,
.quiz-fill-inputs input.correct,
.sentence-blank.correct {
  border-color: rgba(46, 160, 67, 0.7);
  background-image:
    url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjMTZhMzRhIiBzdHJva2Utd2lkdGg9IjMiIHN0cm9rZS1saW5lY2FwPSJyb3VuZCIgc3Ryb2tlLWxpbmVqb2luPSJyb3VuZCIgb3BhY2l0eT0iMC43Ij48cG9seWxpbmUgcG9pbnRzPSIyMCA2IDkgMTcgNCAxMiIvPjwvc3ZnPg=="),
    linear-gradient(180deg, rgba(255,255,255,0.3), rgba(46,160,67,0.10));
  background-repeat: no-repeat, no-repeat;
  background-position: right 12px center, 0 0;
  background-size: 14px 14px, auto;
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 0 0 3px rgba(46,160,67,0.18);
  padding-right: 32px;
}
.fc-inputs input.wrong,
.quiz-fill-inputs input.wrong,
.sentence-blank.wrong {
  border-color: rgba(215, 38, 61, 0.7);
  background: linear-gradient(180deg, rgba(255,255,255,0.3), rgba(215,38,61,0.10));
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 0 0 3px rgba(215,38,61,0.18);
}
/* Wrong state: show user's text struck through on the left, ✗ + correct word inline at right */
.quiz-fill-inputs input.wrong {
  text-align: left;
  padding-left: 14px;
  padding-right: 130px;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
  text-decoration-color: rgba(215, 38, 61, 0.55);
  color: rgba(215, 38, 61, 0.78);
}
.fill-row { position: relative; }
.fill-row .field-indicator.wrong {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
  width: auto;
  font-size: 0.88rem;
  gap: 5px;
  font-weight: 700;
  white-space: nowrap;
}
.fill-row .field-indicator.wrong .fi-icon {
  width: 18px; height: 18px;
  font-size: 0.72rem;
}
.fill-row .field-indicator.wrong .fi-correct {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: 0.92rem;
  color: var(--success);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}
.sentence-blank { border-radius: 8px; border-bottom-width: 2px; }
.q-card { position: relative; padding-bottom: 42px; }
.give-up-btn {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-size: 0.82rem;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.1s;
}
.give-up-btn:hover {
  background: rgba(0,0,0,0.04);
  color: var(--text);
  border-color: var(--text-muted);
}
.give-up-btn:active { transform: scale(0.97); }
.give-up-btn.hidden { display: none; }
.next-btn-corner {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-size: 0.85rem;
  font-weight: 700;
  background: linear-gradient(135deg, #ff7a45, #ff5c8a);
  color: white;
  border: 0;
  padding: 6px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  box-shadow: 0 4px 14px rgba(255, 90, 60, 0.28);
  transition: transform 0.1s, box-shadow 0.15s;
}
.next-btn-corner:hover { box-shadow: 0 6px 18px rgba(255, 90, 60, 0.36); }
.next-btn-corner:active { transform: scale(0.97); }

/* ----- Cloud sync menu item ----- */
.menu-divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 6px 8px;
}
.menu-cloud {
  display: flex !important;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.menu-cloud .cloud-line { display: inline-flex; align-items: center; gap: 8px; }
.menu-cloud .cloud-status {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: background 0.2s;
}
.menu-cloud .cloud-status[data-status="synced"]    { background: hsl(140 65% 50%); }
.menu-cloud .cloud-status[data-status="syncing"]   { background: hsl(45 95% 55%); animation: cloud-pulse 1.2s ease-in-out infinite; }
.menu-cloud .cloud-status[data-status="signing-in"]{ background: hsl(45 95% 55%); animation: cloud-pulse 1.2s ease-in-out infinite; }
.menu-cloud .cloud-status[data-status="error"]     { background: hsl(0 70% 55%); }
.menu-cloud .cloud-status[data-status="idle"]      { background: var(--text-muted); opacity: 0.4; }
@keyframes cloud-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.4); opacity: 0.6; }
}
.menu-cloud.signed-in .cloud-icon { filter: hue-rotate(170deg); }

/* ----- Premium gating: locked group cards + paywall ----- */
.group-card.group-card-locked {
  opacity: 0.78;
  border-left-color: var(--text-muted);
}
.group-card.group-card-locked .group-preview { filter: grayscale(0.55); }
.group-card.group-card-locked:hover { opacity: 1; }
.group-lock {
  position: absolute;
  top: -8px;
  right: -8px;
  background: linear-gradient(135deg, hsl(45 90% 55%), hsl(30 90% 50%));
  color: white;
  font-size: 0.95rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.18));
  z-index: 2;
}

.paywall-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: 16px;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  animation: paywall-fade 0.2s ease-out;
}
.paywall-backdrop.hidden { display: none; }
@keyframes paywall-fade { from { opacity: 0; } to { opacity: 1; } }
.paywall {
  background: var(--bg-elev);
  border-radius: 20px;
  padding: 28px 24px 22px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  text-align: center;
  position: relative;
  animation: paywall-pop 0.25s cubic-bezier(.34,1.56,.64,1);
}
@keyframes paywall-pop {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.paywall-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: transparent;
  border: 0;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 10px;
}
.paywall-close:hover { color: var(--text); }
.paywall-emoji { font-size: 2.6rem; line-height: 1; margin-bottom: 6px; }
.paywall-title { margin: 0 0 8px; font-size: 1.4rem; }
.paywall-sub { margin: 0 0 18px; color: var(--text-muted); font-size: 0.92rem; line-height: 1.45; }
.paywall-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}
.paywall-option {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 12px 16px;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s, box-shadow 0.15s;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  grid-template-areas:
    "name  price"
    "note  price";
  align-items: center;
  column-gap: 12px;
  color: var(--text);
}
.paywall-option:hover { border-color: hsl(20 80% 55%); box-shadow: 0 4px 14px rgba(255, 90, 60, 0.12); }
.paywall-option:active { transform: scale(0.98); }
.paywall-option-primary {
  background: linear-gradient(135deg, hsl(20 95% 96%), var(--bg) 70%);
  border-color: hsl(20 80% 55%);
}
[data-theme="dark"] .paywall-option-primary {
  background: linear-gradient(135deg, hsl(20 50% 18%), var(--bg) 70%);
}
.paywall-option-name { grid-area: name; font-weight: 700; font-size: 1rem; }
.paywall-option-price {
  grid-area: price;
  font-weight: 800;
  font-size: 1.4rem;
  color: hsl(20 80% 45%);
  white-space: nowrap;
}
.paywall-period { font-size: 0.85rem; font-weight: 500; color: var(--text-muted); }
.paywall-option-note { grid-area: note; font-size: 0.78rem; color: var(--text-muted); }
.paywall-fineprint { font-size: 0.75rem; color: var(--text-muted); margin: 0; }
[data-theme="dark"] .give-up-btn:hover { background: rgba(255,255,255,0.06); }
.quiz-fill-inputs input.gave-up {
  border-color: rgba(245, 158, 11, 0.7);
  background: linear-gradient(180deg, rgba(255,255,255,0.3), rgba(245,158,11,0.10));
  color: rgba(160, 100, 8, 0.92);
  text-align: center;
  text-decoration: none;
  padding-left: 14px;
  padding-right: 14px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 0 0 3px rgba(245,158,11,0.18);
}

/* ----- Chips / pills / small glass elements ----- */
.chip,
.group-preview-verb,
.round-pill,
.study-form,
.subsection-id,
.study-num,
.stage-dot,
.field-indicator .fi-correct,
.enter-tip kbd {
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-d);
}
.chip {
  background: var(--glass-bg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 2px 6px rgba(40,24,80,0.05);
}
.chip:hover { background: var(--glass-bg-strong); border-color: rgba(255, 122, 69, 0.5); }
.chip.active {
  background: linear-gradient(135deg, #ff7a45, #ff5c8a);
  color: white;
  border-color: rgba(255,255,255,0.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 4px 14px rgba(255,90,60,0.30);
}
.chip.meta { background: rgba(74, 144, 226, 0.18); }

.group-preview-verb {
  background: var(--glass-bg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset;
}

.round-pill {
  background: var(--glass-bg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset;
}
.round-pill.active {
  background: linear-gradient(135deg, hsl(var(--sub-hue) 70% 55%), hsl(calc(var(--sub-hue) + 30) 70% 55%));
  border-color: rgba(255,255,255,0.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 4px 12px hsla(var(--sub-hue), 60%, 50%, 0.35);
}
.round-pill.done {
  background: linear-gradient(135deg, rgba(46,160,67,0.85), rgba(46,160,67,0.7));
  color: white;
  border-color: rgba(255,255,255,0.4);
}

/* Quiz options */
.quiz-option {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1.5px solid var(--glass-border-d);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 2px 6px rgba(40,24,80,0.05);
}
.quiz-option:hover:not(:disabled) {
  background: var(--glass-bg-strong);
  border-color: rgba(255, 122, 69, 0.5);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 8px 18px rgba(40,24,80,0.10);
}
.quiz-option.correct {
  background: linear-gradient(180deg, rgba(255,255,255,0.3), rgba(46,160,67,0.18));
  border-color: rgba(46,160,67,0.7);
}
.quiz-option.wrong {
  background: linear-gradient(180deg, rgba(255,255,255,0.3), rgba(215,38,61,0.18));
  border-color: rgba(215,38,61,0.7);
}

/* ----- Lesson section title (gradient header above cards) ----- */
.lesson-sec-title {
  background:
    linear-gradient(135deg, rgba(255, 122, 69, 0.18) 0%, rgba(124, 108, 232, 0.12) 60%, transparent 100%),
    var(--glass-bg);
  border: 1px solid var(--glass-border-d);
  border-left: 6px solid #ff7a45;
}
.lesson-sec-num {
  background: linear-gradient(135deg, #ff7a45, #ff5c8a);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 4px 10px rgba(255,90,60,0.30);
}

/* ----- Flashcards ----- */
.flash-face {
  background: var(--glass-shine), var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius);
}
.flash-front {
  background:
    var(--glass-shine),
    linear-gradient(135deg, hsla(var(--sub-hue,20), 80%, 80%, 0.40), hsla(var(--sub-hue,20), 80%, 90%, 0.20)),
    var(--glass-bg);
}
.flash-back {
  background: var(--glass-shine), var(--glass-bg-strong);
  border-color: hsla(var(--sub-hue,20), 70%, 55%, 0.45);
}

/* ----- Study (Stage 1) ----- */
.study-hero {
  background:
    var(--glass-shine),
    linear-gradient(135deg, hsla(var(--sub-hue), 75%, 75%, 0.32) 0%, hsla(var(--sub-hue), 75%, 85%, 0.14) 100%),
    var(--glass-bg);
}
.study-hero-pattern {
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1.5px solid hsla(var(--sub-hue), 70%, 55%, 0.55);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 4px 14px hsla(var(--sub-hue), 60%, 50%, 0.20);
}

.study-row {
  background: var(--glass-shine), var(--glass-bg);
}
.study-row::before {
  background: linear-gradient(180deg,
    hsl(var(--sub-hue) 70% 60%),
    hsl(calc(var(--sub-hue) + 30) 70% 60%));
}
.study-form {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-d);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset;
}
.study-form:hover {
  background: var(--glass-bg-strong);
  border-color: hsla(var(--sub-hue), 70%, 55%, 0.55);
}
.study-num,
.study-speak {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.4), rgba(255,255,255,0)),
    hsla(var(--sub-hue, 20), 75%, 75%, 0.40);
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.5) inset, 0 2px 6px rgba(40,24,80,0.06);
}
[data-theme="dark"] .study-num,
[data-theme="dark"] .study-speak {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0)),
    hsla(var(--sub-hue, 20), 50%, 35%, 0.55);
  border-color: rgba(255,255,255,0.12);
}

/* ----- Stage dots ----- */
.stage-dot {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-d);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset;
}
.stage-dot.active {
  background: linear-gradient(135deg, #ff7a45, #ff5c8a);
  border-color: rgba(255,255,255,0.4);
  color: white;
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 4px 12px rgba(255,90,60,0.40);
}
.stage-dot.done {
  background: linear-gradient(135deg, #2ea043, #6fc878);
  border-color: rgba(255,255,255,0.4);
  color: white;
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 4px 12px rgba(46,160,67,0.35);
}

/* ----- Progress bars ----- */
.lesson-bar,
.quiz-bar {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-d);
  box-shadow: inset 0 1px 2px rgba(40,24,80,0.06);
  height: 8px;
  border-radius: 999px;
}
.lesson-bar-fill,
.quiz-bar-fill {
  background: linear-gradient(90deg,
    hsl(var(--sub-hue, 20) 70% 60%),
    hsl(calc(var(--sub-hue, 20) + 40) 70% 65%));
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset, 0 0 12px hsla(var(--sub-hue, 20), 70%, 60%, 0.5);
  border-radius: 999px;
}

/* ----- Subsection-id pills ----- */
.subsection-id {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.35), rgba(255,255,255,0)),
    hsla(var(--sub-hue, 20), 70%, 55%, 0.95);
  color: white;
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow: 0 1px 0 rgba(255,255,255,0.45) inset, 0 2px 6px hsla(var(--sub-hue, 20), 60%, 50%, 0.30);
}

/* ----- Field indicators (per-form check) ----- */
.field-indicator .fi-icon {
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset, 0 2px 8px rgba(0,0,0,0.10);
}
.field-indicator .fi-correct {
  background: linear-gradient(180deg, rgba(255,255,255,0.3), rgba(46,160,67,0.20));
  border: 1px solid rgba(46,160,67,0.5);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
}

/* Enter tip kbd */
.enter-tip kbd {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset, 0 1px 2px rgba(40,24,80,0.10);
}

/* ----- Footer ----- */
.app-footer {
  background: var(--glass-bg-soft);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-border-d);
  border-radius: 0;
  box-shadow: none;
}

/* ----- Stat / result cards ----- */
.stat,
.result-row {
  background: var(--glass-shine), var(--glass-bg);
  border-radius: var(--radius-sm);
}

/* ----- Speak button ----- */
.speak-btn {
  border-radius: 999px;
  transition: all 0.16s;
}
.speak-btn:hover {
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
}

/* Vowel highlight inside glass — softer */
.verb-form .vowel,
.study-form-word .vowel,
.flash-forms .vowel {
  background: hsla(var(--sub-hue, 20), 80%, 70%, 0.20);
  padding: 0 3px;
  border-radius: 4px;
}

/* Make text pop against translucent backgrounds */
body, .text { color: var(--text); }

/* Soft scrollbar (so it matches the glass aesthetic on Mac) */
@media (pointer: fine) {
  ::-webkit-scrollbar { width: 10px; height: 10px; }
  ::-webkit-scrollbar-thumb {
    background: rgba(120, 100, 160, 0.25);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
  }
  ::-webkit-scrollbar-thumb:hover { background: rgba(120, 100, 160, 0.4); background-clip: padding-box; }
}

/* ================== Hero intro ================== */
.intro-hero h2 {
  font-size: 1.85rem;
  line-height: 1.2;
  margin: 0 0 10px;
  background: linear-gradient(135deg, #5dc9bd, #7c6ff5);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-lead {
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--text);
  margin: 0 0 16px;
}
.hero-bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: grid;
  gap: 10px;
}
.hero-bullets li {
  background: var(--card-bg, rgba(255,255,255,0.6));
  border: 1px solid var(--border, rgba(0,0,0,0.06));
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.95rem;
  line-height: 1.4;
}
.hero-foot {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 22px;
}
@media (max-width: 480px) {
  .intro-hero h2 { font-size: 1.5rem; }
  .hero-lead { font-size: 0.95rem; }
  .hero-bullets li { font-size: 0.88rem; padding: 9px 12px; }
}

/* ================== Paywall sign-in inline ================== */
.paywall-signin {
  background: linear-gradient(135deg, rgba(93,201,189,0.12), rgba(124,111,245,0.12));
  border: 1px solid rgba(93,201,189,0.3);
  border-radius: 14px;
  padding: 14px 16px;
  margin: 0 0 16px;
  text-align: center;
}
.paywall-signin-text {
  margin: 0 0 12px;
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--text);
}
.paywall-signin-btn {
  width: 100%;
}
.paywall-options.disabled {
  opacity: 0.45;
  pointer-events: none;
  filter: grayscale(0.4);
}

/* ================== Give-up armed state ================== */
.give-up-btn.armed {
  background: #f59e0b !important;
  color: white !important;
  animation: giveup-pulse 0.6s ease-in-out infinite alternate;
}
@keyframes giveup-pulse {
  from { transform: scale(1); }
  to   { transform: scale(1.04); }
}

/* ================== Resume card (in-progress lesson) ================== */
.resume-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  background: linear-gradient(135deg,
    hsl(var(--sub-hue, 200) 70% 96%),
    hsl(var(--sub-hue, 200) 70% 99%));
  border: 1px solid hsl(var(--sub-hue, 200) 60% 70% / 0.55);
  border-left: 5px solid hsl(var(--sub-hue, 200) 65% 55%);
  border-radius: 16px;
  padding: 14px 18px;
  margin: 0 0 22px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.06);
}
.resume-icon { font-size: 2rem; line-height: 1; }
.resume-text { min-width: 0; }
.resume-title { font-weight: 700; font-size: 1.02rem; margin: 0 0 4px; }
.resume-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 0 0 4px; }
.resume-meta .subsection-id {
  background: hsl(var(--sub-hue, 200) 65% 45%);
  color: white;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}
.resume-pattern { font-size: 0.92rem; color: var(--text); }
.resume-stage { font-size: 0.85rem; color: var(--text-muted); }
.resume-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.resume-actions .btn { padding: 8px 14px; font-size: 0.9rem; }

@media (max-width: 560px) {
  .resume-card {
    grid-template-columns: auto 1fr;
    grid-template-areas: "icon text" "actions actions";
    gap: 10px 12px;
  }
  .resume-icon { grid-area: icon; font-size: 1.6rem; }
  .resume-text { grid-area: text; }
  .resume-actions { grid-area: actions; justify-content: stretch; }
  .resume-actions .btn { flex: 1; }
}

/* Dark mode */
body.theme-dark .resume-card,
[data-theme="dark"] .resume-card {
  background: linear-gradient(135deg,
    hsl(var(--sub-hue, 200) 35% 22%),
    hsl(var(--sub-hue, 200) 35% 16%));
  border-color: hsl(var(--sub-hue, 200) 50% 50% / 0.6);
  border-left-color: hsl(var(--sub-hue, 200) 60% 55%);
}

/* ================== Toast notifications ================== */
.toast-container {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
  width: min(92vw, 480px);
}
.toast {
  background: rgba(30, 30, 40, 0.95);
  color: white;
  padding: 13px 18px;
  border-radius: 12px;
  font-size: 0.94rem;
  line-height: 1.4;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  cursor: pointer;
  pointer-events: auto;
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity 0.22s ease, transform 0.22s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast-success { background: rgba(34, 139, 96, 0.95); }
.toast-error { background: rgba(190, 60, 60, 0.95); }
.toast-info { background: rgba(50, 90, 160, 0.95); }