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

:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --secondary: #8b5cf6;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

html,
body {
  height: 100%;
  font-family: 'Klee One', 'Noto Sans Bengali', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 500;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Minimal Compact Header */
.topbar {
  background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
  color: white;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
  padding: 0.9rem 1rem 0.85rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
}

.topbar .brand,
.topbar .nav-controls {
  margin: 0 auto;
  width: min(1400px, 100%);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0;
  white-space: nowrap;
}

.subtitle {
  font-size: 0.75rem;
  opacity: 0.85;
  font-weight: 400;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.version-badge {
  font-size: 0.65rem;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.3);
  letter-spacing: 0.02em;
}

/* Attribution row under brand */
.brand-meta {
  margin: 0.1rem auto 0;
  /* compact spacing under brand */
  width: min(1400px, 100%);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #fff;
  opacity: 0.95;
  font-size: 0.85rem;
}

.brand-meta__badge {
  color: #fff;
  text-decoration: none;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
  transition: background 0.2s ease, transform 0.2s ease;
}

.brand-meta__badge:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

.brand-meta__creator {
  opacity: 0.95;
}

.brand-meta__creator strong {
  font-weight: 500;
}

.nav-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.6rem;
}

.resource-row {
  width: 100%;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1rem;
}

.resource-row .resource-buttons {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.install-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.2rem;
  background: #ffffff;
  color: var(--primary);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  white-space: nowrap;
}

.install-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  background: #f8fafc;
}

.install-btn:active {
  transform: translateY(0);
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
  color: white;
  cursor: pointer;
  transition: all 0.2s ease;
  backdrop-filter: blur(10px);
  font-size: 0.9rem;
  font-weight: 500;
  min-width: 90px;
  justify-content: space-between;
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lang-toggle .lang-label {
  flex: 1;
  text-align: center;
}

.lang-toggle .lang-switch {
  font-size: 1.1rem;
  opacity: 0.8;
  font-weight: 400;
}

.mascot-container {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  height: 42px;
  /* Approx height of lang-toggle */
  width: 60px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
}

.mascot-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.5);
}

.level-tabs {
  display: flex;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
}

.level-tab {
  padding: 0.5rem 1.25rem;
  border: none;
  background: transparent;
  color: white;
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.level-tab:hover {
  background: rgba(255, 255, 255, 0.15);
}

.level-tab.active {
  background: white;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.resource-buttons {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.resource-btn {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  color: white;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s ease;
  backdrop-filter: blur(10px);
}

.resource-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.btn-icon {
  font-size: 1.1rem;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 1.5rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.lesson-header {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lesson-header h2 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.level-quiz-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, var(--secondary) 0%, #6d28d9 100%);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.level-quiz-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.level-quiz-btn .btn-icon {
  font-size: 1.1rem;
}

/* Lesson Grid */
.lesson-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  padding: 0;
}

.lesson-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.lesson-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.lesson-header-card {
  padding: 0.75rem 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  font-weight: 500;
  font-size: 0.95rem;
  text-align: center;
}

.lesson-num-label {
  display: block;
}

.lesson-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.lesson-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 0.5rem;
  gap: 0.3rem;
  text-decoration: none;
  color: var(--text-primary);
  background: var(--bg-card);
  border: none;
  border-right: 1px solid var(--border);
  transition: background 0.2s ease, transform 0.1s ease;
  cursor: pointer;
  min-height: 72px;
}

.lesson-btn:last-child {
  border-right: none;
}

.lesson-btn:hover {
  background: var(--bg-main);
}

.lesson-btn:active {
  transform: scale(0.97);
}

.lesson-btn .btn-icon {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--primary);
}

.lesson-btn .btn-text {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.story-btn .btn-icon {
  color: #059669;
}

.grammar-btn .btn-icon {
  color: var(--primary);
}

.vocab-btn .btn-icon {
  color: #dc2626;
}

.learn-btn .btn-icon {
  color: #8b5cf6;
}

.grammar-link:hover {
  transform: scale(1.15);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.grammar-link:active {
  transform: scale(1.05);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .lesson-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
  }
}

@media (max-width: 768px) {
  .topbar {
    padding: 0.75rem 0.75rem;
    gap: 0.5rem;
  }

  .brand h1 {
    font-size: 1.1rem;
  }

  .brand .subtitle {
    font-size: 0.65rem;
  }

  .brand {
    gap: 0.25rem;
  }

  .nav-controls {
    gap: 0.5rem;
  }

  .resource-buttons {
    gap: 0.35rem;
  }

  .resource-btn {
    padding: 0.4rem 0.6rem;
  }

  .level-tab {
    padding: 0.4rem 1rem;
  }

  .main-content {
    padding: 1.5rem 1rem;
  }

  .lesson-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
  }

  .lesson-btn {
    min-height: 64px;
    padding: 0.7rem 0.35rem;
  }

  .lesson-btn .btn-icon {
    font-size: 1.25rem;
  }

  .lesson-btn .btn-text {
    font-size: 0.7rem;
  }
}

@media (max-width: 480px) {
  .level-tabs {
    width: 100%;
    justify-content: space-between;
  }

  .level-tab {
    flex: 1;
  }

  .lesson-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  /* Keep all 4 buttons in one row on mobile */
  .lesson-buttons {
    grid-template-columns: repeat(4, 1fr);
  }

  .lesson-btn {
    min-height: 56px;
    padding: 0.5rem 0.25rem;
    gap: 0.25rem;
  }

  .lesson-btn .btn-icon {
    font-size: 1.1rem;
  }

  .lesson-btn .btn-text {
    font-size: 0.65rem;
    line-height: 1.1;
  }

  .lesson-header-card {
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
  }

  .lesson-header h2 {
    font-size: 1.25rem;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.lesson-item {
  animation: fadeIn 0.4s ease-out backwards;
}

.lesson-item:nth-child(1) {
  animation-delay: 0.05s;
}

.lesson-item:nth-child(2) {
  animation-delay: 0.1s;
}

.lesson-item:nth-child(3) {
  animation-delay: 0.15s;
}

.lesson-item:nth-child(4) {
  animation-delay: 0.2s;
}

.lesson-item:nth-child(5) {
  animation-delay: 0.25s;
}

.lesson-item:nth-child(6) {
  animation-delay: 0.3s;
}

/* Restricted Lesson Styles */
.lesson-item.restricted {
  filter: grayscale(1);
  opacity: 0.6;
  pointer-events: none;
  cursor: not-allowed !important;
  position: relative;
  user-select: none;
}

.lesson-item.restricted * {
  pointer-events: none !important;
}

.lesson-item.restricted::after {
  content: 'PREMIUM';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-15deg);
  background: rgba(0, 0, 0, 0.8);
  color: #fbbf24; /* Amber-400 */
  padding: 0.35rem 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  pointer-events: none;
  z-index: 100;
  border: 2px solid #fbbf24;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.level-tab.restricted {
  opacity: 0.5;
  cursor: not-allowed;
  position: relative;
}

.level-tab.restricted::after {
  content: '🔒';
  font-size: 0.7rem;
  margin-left: 0.3rem;
  vertical-align: middle;
}

/* Vocabulary Search Styles */
.search-trigger {
  margin-left: auto;
  /* Push to right in flex container */
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.search-trigger:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: scale(1.1);
}

.search-trigger .icon {
  font-size: 1rem;
}

/* Modal */
.search-modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: flex-start;
  justify-content: center;
  padding-top: 5vh;
}

.search-modal.active {
  display: flex;
}

.search-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease-out;
}

.search-window {
  position: relative;
  background: var(--bg-card);
  width: min(600px, 92%);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  max-height: 85vh;
  animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid var(--border);
  overflow: hidden;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.search-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 0.75rem;
  align-items: center;
  background: var(--bg-main);
}

.search-input-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-input-wrapper .search-icon {
  position: absolute;
  left: 0.75rem;
  color: var(--text-secondary);
  font-size: 1rem;
  pointer-events: none;
}

#searchInput {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
}

#searchInput:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.clear-search-btn {
  position: absolute;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.clear-search-btn:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}

.close-search-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
}

.close-search-btn:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}

.search-content {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  min-height: 100px;
}

.search-message {
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.search-results-list {
  display: flex;
  flex-direction: column;
}

.search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: background 0.2s;
  cursor: pointer;
}

.search-result-item:hover {
  background: var(--bg-active);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-play-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-light);
  color: white;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.search-play-btn:hover {
  background: var(--primary);
  transform: scale(1.1);
}

.result-content {
  flex: 1;
  min-width: 0;
}

.result-word {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.1rem;
}

.result-reading {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.result-meaning {
  font-size: 0.95rem;
  color: var(--primary-dark);
}

.result-lesson-tag {
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: var(--bg-main);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* Global Search Filter Styles */
.search-window-global {
  width: min(700px, 94%);
}

.search-filters {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-main);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.filter-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
  font-family: inherit;
}

.filter-toggle:hover {
  border-color: var(--primary-light);
  background: var(--bg-active);
}

.filter-toggle.active {
  border-color: var(--primary);
  background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%);
  color: var(--primary);
}

.filter-toggle.active:hover {
  background: linear-gradient(135deg, #bfdbfe 0%, #dbeafe 100%);
}

.filter-toggle.active[data-source="vocab"] {
  border-color: #10b981;
  background: linear-gradient(135deg, #d1fae5 0%, #ecfdf5 100%);
  color: #059669;
}

.filter-toggle.active[data-source="kanji"] {
  border-color: #f472b6;
  background: linear-gradient(135deg, #fce7f3 0%, #fdf2f8 100%);
  color: #db2777;
}

.filter-toggle.active[data-source="grammar"] {
  border-color: #8b5cf6;
  background: linear-gradient(135deg, #ede9fe 0%, #f5f3ff 100%);
  color: #7c3aed;
}

.filter-toggle.active[data-source="captions"] {
  border-color: #f59e0b;
  background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);
  color: #d97706;
}

.filter-icon {
  font-size: 0.95rem;
}

.filter-label {
  font-size: 0.8rem;
}

/* Loading Spinner */
.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
  margin-right: 0.5rem;
}

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

.search-message {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* Source Badge for results */
.result-source-tag {
  font-size: 0.65rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  margin-left: 0.35rem;
  vertical-align: middle;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.result-source-tag.vocab {
  background: #d1fae5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

.result-source-tag.kanji {
  background: #fce7f3;
  color: #db2777;
  border: 1px solid #fbcfe8;
}

.result-source-tag.grammar {
  background: #ede9fe;
  color: #7c3aed;
  border: 1px solid #ddd6fe;
}

.result-source-tag.captions {
  background: #fef3c7;
  color: #d97706;
  border: 1px solid #fde68a;
}

/* Enhanced result item styling */
.search-result-item.vocab-result .search-play-btn {
  background: #10b981;
}

.search-result-item.kanji-result .search-play-btn {
  background: #ec4899;
}

.search-result-item.grammar-result .search-play-btn {
  background: #8b5cf6;
}

.search-result-item.captions-result .search-play-btn {
  background: #f59e0b;
}

/* Kanji-specific result styling */
.result-kanji-char {
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1;
  font-family: 'Klee One', serif;
}

.result-kanji-reading {
  font-size: 0.8rem;
  color: #6b7280;
  margin-top: 0.15rem;
}

.result-kanji-components {
  font-size: 0.75rem;
  color: #9ca3af;
  margin-top: 0.1rem;
}

/* Grammar result styling */
.result-grammar-text {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* Caption result styling */
.result-caption-text {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.result-caption-meta {
  font-size: 0.75rem;
  color: #9ca3af;
  margin-top: 0.2rem;
}

/* Mobile responsive filters */
@media (max-width: 480px) {
  .search-filters {
    gap: 0.4rem;
    padding: 0.6rem 0.75rem;
  }

  .filter-toggle {
    padding: 0.35rem 0.6rem;
    font-size: 0.8rem;
    flex: 1;
    justify-content: center;
  }

  .filter-label {
    display: none;
  }

  .filter-icon {
    font-size: 1.1rem;
  }
}