/* Hindi Bharakhadi Studio — Montessori classroom aesthetic */

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --primary: #2e7d32;
  --primary-light: #e8f5e9;
  --accent: #ff8f00;
  --accent-light: #fff3e0;
  --text: #1a1a1a;
  --text-muted: #616161;
  --border: #e0e0e0;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --font: 'Nunito', system-ui, sans-serif;
  --devanagari: 'Noto Sans Devanagari', 'Nirmala UI', sans-serif;
  --gujarati: 'Noto Sans Gujarati', 'Nirmala UI', sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.app-header__top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Language switcher */
.lang-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.lang-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  padding: 0.5rem 0.85rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  cursor: pointer;
  font: inherit;
  transition: all var(--transition);
  min-width: 72px;
}

.lang-btn__native {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.2;
}

.lang-btn__en {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
}

.lang-btn:hover {
  border-color: var(--primary);
}

.lang-btn--active {
  border-color: var(--primary);
  background: var(--primary-light);
}

body[data-lang="gu"] .tile__dev,
body[data-lang="gu"] .flashcard__letter,
body[data-lang="gu"] .join-part,
body[data-lang="gu"] .join-result,
body[data-lang="gu"] .lab-selected,
body[data-lang="gu"] .conjunct-detail__break,
body[data-lang="gu"] .lang-btn__native {
  font-family: var(--gujarati);
}

body[data-lang="hi"] .tile__dev,
body[data-lang="hi"] .flashcard__letter,
body[data-lang="hi"] .join-part,
body[data-lang="hi"] .join-result,
body[data-lang="hi"] .lab-selected,
body[data-lang="hi"] .conjunct-detail__break,
body[data-lang="sa"] .tile__dev,
body[data-lang="sa"] .flashcard__letter,
body[data-lang="sa"] .join-part,
body[data-lang="sa"] .join-result,
body[data-lang="sa"] .lab-selected,
body[data-lang="sa"] .conjunct-detail__break {
  font-family: var(--devanagari);
}

.loading-inline {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
}

.app-header__icon {
  font-size: 2.5rem;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.app-header__title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.app-header__tagline {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.search-bar {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 999px;
  padding: 0 1rem;
  transition: border-color var(--transition);
}

.search-bar:focus-within {
  border-color: var(--primary);
}

.search-bar__icon {
  color: var(--text-muted);
}

.search-bar__input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.85rem 0.75rem;
  font: inherit;
  font-size: 1rem;
  outline: none;
}

.search-results {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  padding: 0.75rem;
  z-index: 100;
  max-height: 320px;
  overflow-y: auto;
}

.search-results__list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.5rem;
}

.search-empty {
  text-align: center;
  color: var(--text-muted);
  margin: 0.5rem;
}

.voice-badge {
  margin: 0.75rem 0 0;
  font-size: 0.8rem;
  color: var(--primary);
  background: var(--primary-light);
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

.voice-badge--warn {
  color: #e65100;
  background: var(--accent-light);
}

/* Tab navigation */
.tab-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.25rem 0 1rem;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.tab {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.65rem 1rem;
  border: 2px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.tab .material-icons {
  font-size: 1.1rem;
}

.tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tab--active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Main content */
.app-main {
  flex: 1;
}

.content-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  min-height: 400px;
}

.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.loading__icon {
  font-size: 2.5rem;
  animation: spin 2s linear infinite;
}

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

.error {
  color: #c62828;
  text-align: center;
}

/* Section headings */
.section-head {
  margin-bottom: 1.25rem;
}

.section-head h2 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
}

.section-head__sub {
  margin: 0.35rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.section-note {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Tiles */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
  gap: 0.75rem;
}

.tile-grid--consonants {
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
}

.tile-grid--expanded {
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
}

.tile-grid--compact {
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
}

.tile-grid--words {
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
}

.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.85rem 0.5rem;
  min-height: 88px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  transition: all var(--transition);
  font: inherit;
  touch-action: manipulation;
}

.tile:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.tile--active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.tile__dev {
  font-family: var(--devanagari);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
}

.tile__latin {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: lowercase;
}

.tile--small .tile__dev {
  font-size: 1.5rem;
}

.tile--small {
  min-height: 64px;
  padding: 0.5rem;
}

/* Bharakhadi expand */
.expand-panel {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 2px dashed var(--border);
  animation: fadeIn 0.3s ease;
}

.expand-panel__label {
  font-weight: 700;
  color: var(--text-muted);
  margin: 0 0 1rem;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Blackboard */
.blackboard {
  background: #263238;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

.blackboard__row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.blackboard__row:last-child {
  border-bottom: none;
}

.blackboard__arrow {
  color: #ffd54f;
  font-size: 1.5rem;
}

.tile--chalk {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
}

.tile--chalk .tile__dev {
  color: #fff;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.tile--chalk .tile__latin {
  color: rgba(255, 255, 255, 0.6);
}

.tile--chalk:hover {
  border-color: #ffd54f;
  background: rgba(255, 255, 255, 0.05);
}

/* Conjunct detail */
.conjunct-detail {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--primary-light);
  border-radius: var(--radius);
  animation: fadeIn 0.3s ease;
}

.conjunct-detail__break {
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 1rem;
  font-family: var(--devanagari);
}

.join-stage-wrap,
.join-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem;
}

.join-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.join-part {
  font-family: var(--devanagari);
  font-size: 2rem;
  font-weight: 700;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  animation: slideIn 0.4s ease backwards;
}

.join-plus {
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 700;
}

.join-arrow {
  color: var(--primary);
  font-size: 1.75rem !important;
  opacity: 0;
  transition: opacity 0.4s;
}

.join-result {
  font-family: var(--devanagari);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.join-stage--done .join-arrow {
  opacity: 1;
}

.join-stage--done .join-result {
  opacity: 1;
  transform: scale(1);
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

.examples-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1rem;
}

/* Practice flashcard */
.flashcard {
  max-width: 420px;
  margin: 0 auto;
  text-align: center;
}

.flashcard__letter {
  font-family: var(--devanagari);
  font-size: clamp(4rem, 15vw, 6rem);
  font-weight: 700;
  padding: 2rem;
  background: var(--accent-light);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.flashcard__answer {
  font-family: var(--devanagari);
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.flashcard__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  touch-action: manipulation;
}

.btn .material-icons {
  font-size: 1.2rem;
}

.btn--primary {
  background: var(--primary);
  color: #fff;
}

.btn--primary:hover {
  background: #1b5e20;
}

.btn--secondary {
  background: var(--bg);
  color: var(--text);
  border: 2px solid var(--border);
}

.btn--secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn--accent {
  background: var(--accent);
  color: #fff;
}

.btn--accent:hover {
  background: #ef6c00;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Writing guide */
.writing-picker {
  margin-bottom: 1.5rem;
}

.writing-canvas-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.writing-svg {
  width: min(280px, 80vw);
  height: min(280px, 80vw);
  background: var(--bg);
  border-radius: var(--radius);
  border: 2px solid var(--border);
}

.writing-svg__ghost {
  font-family: var(--devanagari);
  font-size: 14px;
  fill: rgba(0, 0, 0, 0.06);
}

.writing-stroke {
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: drawStroke 1.2s ease forwards;
}

@keyframes drawStroke {
  to { stroke-dashoffset: 0; }
}

/* Word cards */
.word-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.word-card__image {
  aspect-ratio: 4/3;
  background: var(--bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--border);
}

.word-card__image .material-icons {
  font-size: 2.5rem;
}

.word-area {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 2px dashed var(--border);
}

/* Construction Lab */
/* Construction Lab */
.lab-guide {
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  border-left: 4px solid var(--accent);
}

.lab-guide__rule {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0 0 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.lab-guide__rule .material-icons {
  color: var(--accent);
  font-size: 1.25rem;
  flex-shrink: 0;
}

.lab-guide__example {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(0, 0, 0, 0.1);
}

.lab-grid-section__title {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary);
}

.lab-dynamic-note {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.lab-hint {
  text-align: center;
  font-family: var(--devanagari);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--primary);
}

body[data-lang="gu"] .lab-hint {
  font-family: var(--gujarati);
}

.lab-result .btn {
  display: flex;
  margin: 0 auto;
}

.lab-steps {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.lab-step {
  padding: 0.5rem 1rem;
  background: var(--bg);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  border: 2px solid transparent;
}

.lab-step--active {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

.lab-step--done {
  background: var(--primary-light);
  color: var(--primary);
}

.lab-status {
  font-weight: 600;
  margin: 0 0 1rem;
}

.lab-selected {
  font-family: var(--devanagari);
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.lab-result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--primary-light);
  border-radius: var(--radius);
}

.lab-invalid {
  text-align: center;
  color: #c62828;
  font-family: var(--devanagari);
  font-size: 1.25rem;
}

.lab-examples-label {
  text-align: center;
  font-weight: 700;
  margin: 1rem 0 0.5rem;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  .app-shell {
    padding: 0.75rem;
  }

  .app-header {
    padding: 1rem;
  }

  .app-header__title {
    font-size: 1.2rem;
  }

  .app-header__top {
    flex-direction: column;
  }

  .lang-nav {
    width: 100%;
    justify-content: stretch;
  }

  .lang-btn {
    flex: 1;
  }

  .tab__label {
    display: none;
  }

  .tab {
    padding: 0.75rem;
  }

  .content-panel {
    padding: 1rem;
  }

  .tile {
    min-height: 76px;
  }

  .tile__dev {
    font-size: 1.75rem;
  }

  .blackboard__row {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .tile-grid {
    grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
    gap: 0.5rem;
  }

  .flashcard__actions {
    flex-direction: column;
  }

  .flashcard__actions .btn {
    width: 100%;
    justify-content: center;
  }
}