/* Web Font for offline Chinese text support */
@font-face {
  font-family: 'Noto Sans SC';
  src: url('./fonts/NotoSansSC-Regular.otf') format('opentype');
  font-display: swap;
  font-weight: normal;
  font-style: normal;
}

/* Prevent horizontal scrolling */
html, body {
  overflow-x: hidden;
  max-width: 100vw;
}

/* Modal overlay for review mode selection */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0,0,0,0.7);
  justify-content: center;
  align-items: center;
}

.modal.open {
  display: flex;
}

.modal-content {
  background: var(--panel-background);
  padding: 32px 24px;
  border-radius: 8px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
  text-align: center;
  max-width: 90vw;
  max-height: 90vh;
  margin: 0 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.modal-content h2 {
  margin-bottom: 24px;
  color: var(--correct-color);
  line-height: 1.6;
}

.modal-content button {
  margin: 12px 8px;
  min-width: 120px;
  font-size: var(--font-size-base);
}

@media (min-width: 768px) {
  .modal-content {
    max-width: 520px;
  }
  
  .modal-content button {
    margin: 12px 16px;
    min-width: 180px;
    font-size: var(--font-size-md);
  }
}
/* Theme variables: default to dark, override via data-theme or media query */
:root {
  --background-color: #1a1a1a;
  --panel-background: #222;
  --text-color: #cccccc;
  --text-secondary: #888888;
  --correct-color: #ffffff;
  --error-color: #ff0000;
  --accent-color: #2d72d9;
  --hover-color: #2256aa;
  --input-background: #333;
  --input-border: #444;
  --card-background: #333;
  
  /* Text scaling system - default to 1.0 (100%) */
  --text-scale: 1.0;
  
  /* Base font sizes that scale with --text-scale */
  --font-size-xs: calc(12px * var(--text-scale));
  --font-size-sm: calc(14px * var(--text-scale));
  --font-size-base: calc(16px * var(--text-scale));
  --font-size-md: calc(18px * var(--text-scale));
  --font-size-lg: calc(20px * var(--text-scale));
  --font-size-xl: calc(24px * var(--text-scale));
  --font-size-2xl: calc(28px * var(--text-scale));
  --font-size-3xl: calc(32px * var(--text-scale));
  --font-size-4xl: calc(40px * var(--text-scale));
  
  /* Keyboard fixed sizes (NOT scaled with --text-scale) */
  --keyboard-font-xs: 14px;
  --keyboard-font-sm: 15px;
  --keyboard-font-base: 16px;
  --keyboard-font-md: 18px;
  --keyboard-font-lg: 20px;
  --keyboard-font-xl: 22px;
  --keyboard-font-2xl: 24px;
}

/* Light theme variables */
[data-theme="light"] {
  --background-color: #f7f7f7;
  --panel-background: #ffffff;
  --text-color: #222222;
  --text-secondary: #999999;
  --correct-color: #000000;
  --error-color: #cc0000;
  --accent-color: #5c9aeb;
  --hover-color: #4589e0;
  --input-background: #ffffff;
  --input-border: #cccccc;
  --card-background: #f0f0f0;
}

/* Dark theme variables (explicit for manual override) */
[data-theme="dark"] {
  --background-color: #1a1a1a;
  --panel-background: #222;
  --text-color: #cccccc;
  --text-secondary: #888888;
  --correct-color: #ffffff;
  --error-color: #ff0000;
  --accent-color: #2d72d9;
  --hover-color: #2256aa;
  --input-background: #333;
  --input-border: #444;
  --card-background: #333;
}

/* Prefer system if no manual override (handled via JS by data-theme), but add media fallback */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --background-color: #f7f7f7;
    --panel-background: #ffffff;
    --text-color: #222222;
    --text-secondary: #999999;
    --correct-color: #000000;
    --error-color: #c62828;
    --accent-color: #5c9aeb;
    --hover-color: #4589e0;
    --input-background: #ffffff;
    --input-border: #cccccc;
    --card-background: #f0f0f0;
  }
}

body {
  background: var(--background-color);
  color: var(--text-color);
  font-family: 'Noto Sans SC', 'Kaiti', 'KaiTi', '楷体', 'Kaiti SC', 'STKaiti', sans-serif;
  font-size: var(--font-size-base);
  line-height: calc(24px * var(--text-scale));
  margin: 0;
  padding: 0;
  overscroll-behavior: contain;
}

#app {
  max-width: 1200px;
  margin: 40px auto;
  padding: 24px;
  background: var(--panel-background);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  overscroll-behavior: contain;
}

@media (max-width: 768px) {
  #app {
    margin: 0;
    padding: 12px 12px 16px 12px;
    border-radius: 0;
  }
  
  /* Hide title on mobile to save screen space */
  #app > h1 {
    display: none;
  }
  
  /* Move navigation to top and make more compact */
  .nav-buttons {
    margin: 0 0 12px 0;
    padding: 0;
  }
}

button {
  background: var(--accent-color);
  color: var(--correct-color);
  border: none;
  border-radius: 4px;
  font-size: var(--font-size-base);
  margin: 8px 8px 8px 0;
  padding: 0.5em 1.25em;
  cursor: pointer;
  font-family: inherit;
  min-height: 2.5em;
  white-space: normal;
  word-wrap: break-word;
}

button:hover {
  background: var(--hover-color);
}

button.dimmed {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

button.active-nav {
  opacity: 0.6;
  cursor: default;
  pointer-events: none;
}

/* Badge for notification counts */
.badge {
  display: inline-block;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  margin-left: 6px;
  background: #ff4444;
  color: white;
  border-radius: 10px;
  font-size: var(--font-size-xs);
  font-weight: bold;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
}

h1, h2 {
  color: var(--correct-color);
  margin-bottom: 20px;
}

input[type="text"],
input[type="number"],
textarea {
  width: 100%;
  padding: 10px;
  margin: 8px 0;
  background: var(--input-background);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: calc(24px * var(--text-scale));
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

/* Consistent checkbox sizing across all devices */
input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  cursor: pointer;
}

label {
  display: block;
  margin: 12px 0 4px;
  color: var(--text-color);
}

#verseList > div {
  padding: 12px;
  margin: 8px 0;
  background: var(--card-background);
  border-radius: 4px;
  border-left: 4px solid var(--accent-color);
}

.verse-character {
    display: inline-block;
    margin: 0 2px;
    font-size: var(--font-size-lg);
    transition: color 0.2s ease;
}

/* Style for the autocomplete suggestions box */
.autocomplete-suggestions {
    position: absolute;
    z-index: 10; /* Ensure it floats above other elements */
    width: 100%;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--input-border);
    background-color: var(--input-background);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    top: 100%; 
    left: 0;
    display: none; /* Initially hidden */
}

/* Style for individual suggestion items */
.suggestion-item {
    padding: 8px 10px;
    cursor: pointer;
    color: var(--text-color);
    border-bottom: 1px solid var(--input-border);
    background-color: var(--input-background);
}

/* Style for hover and active selection */
.suggestion-item:hover, .suggestion-item.active {
    background-color: var(--hover-color); /* Use the button hover color for consistency */
    color: var(--correct-color); /* White text on hover */
}

/* Ensure the last item doesn't have a bottom border inside the box */
.autocomplete-suggestions .suggestion-item:last-child {
    border-bottom: none;
}

/* Not-yet-typed characters: darker gray for higher contrast with white-correct */
.verse-character {
  color: var(--text-color);
  opacity: 0.5;
}

.verse-character.punctuation {
    color: var(--text-color);
    opacity: 0.7;
    margin: 0;
}

.verse-character.punctuation.hidden {
    visibility: hidden;
}

.verse-character.correct {
    color: var(--correct-color);
    opacity: 1;
}

.verse-character.incorrect {
    color: var(--error-color);
    opacity: 1;
}

.verse-character.hidden {
    visibility: hidden;
}

.reference-inline {
    color: var(--correct-color);
    font-weight: 600;
}

#learnFeedback {
  padding: 8px;
  margin: 8px 0;
  border-radius: 4px;
}

#learnFeedback.error {
  background: rgba(255,68,68,0.1);
  color: var(--error-color);
}

#learnFeedback.success {
  background: rgba(68,255,68,0.1);
  color: #4f4;
}

/* Modal styles for accuracy alert */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
}
.modal.open { display: block; }
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
}
.modal-content {
  position: relative;
  max-width: 90%;
  width: 520px;
  margin: 10% auto;
  background: var(--panel-background);
  padding: 20px;
  border-radius: 8px;
  color: var(--text-color);
  box-shadow: 0 6px 24px rgba(0,0,0,0.3);
}
.modal-message { margin: 12px 0; font-size: var(--font-size-base); }
.modal-accuracy { font-weight: bold; margin-bottom: 16px; font-size: var(--font-size-base); }
.modal-buttons { 
  display: flex; 
  flex-wrap: wrap;
  gap: 10px; 
  justify-content: center;
}
.modal-buttons button { 
  padding: 10px 16px;
  margin: 0;
  flex: 1;
  min-width: 100px;
  max-width: 200px;
}

@media (min-width: 768px) {
  .modal-message { font-size: var(--font-size-md); }
  .modal-accuracy { font-size: var(--font-size-md); }
  .modal-buttons {
    justify-content: flex-end;
  }
  .modal-buttons button {
    flex: 0;
    min-width: 120px;
  }
}

/* Onboarding Modal Styles */
.onboarding-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.onboarding-btn {
  padding: 14px 20px;
  font-size: var(--font-size-base);
  font-weight: 500;
  background-color: var(--button-background);
  color: var(--button-text);
  border: 2px solid var(--button-background);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.onboarding-btn:hover {
  background-color: var(--button-hover);
  border-color: var(--button-hover);
}

.onboarding-btn:active {
  transform: scale(0.98);
}

/* Change Interval Modal Styles */
.interval-controls {
  margin: 20px 0;
  text-align: center;
}

.interval-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.interval-display label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin: 0;
  width: 100%;
  margin-bottom: 8px;
}

.interval-adjuster {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--input-background);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 6px 10px;
}

.interval-btn {
  background: var(--button-background);
  color: var(--button-text);
  border: none;
  border-radius: 4px;
  width: 28px;
  height: 28px;
  font-size: var(--font-size-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.interval-btn:hover {
  background: var(--button-hover);
}

.interval-btn:active {
  transform: scale(0.95);
}

.interval-value {
  font-size: var(--font-size-lg);
  font-weight: 600;
  min-width: 35px;
  text-align: center;
  color: var(--text-color);
}

.interval-days {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: 8px;
  padding: 0 10px;
}

.confirm-btn {
  background-color: #28a745 !important;
  color: white !important;
  font-size: var(--font-size-lg);
  min-width: 60px;
}

.confirm-btn:hover {
  background-color: #218838 !important;
}

.review-controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.review-controls button {
  margin: 0;
}

/* Smooth fade for verse selector to prevent cheating */
#verseSelector {
  transition: opacity 0.35s ease;
}

select {
  width: 100%;
  padding: 8px;
  margin: 8px 0;
  background: var(--input-background);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: var(--font-size-base);
}

.nav-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
  justify-content: center;
}

@media (max-width: 768px) {
  .nav-buttons {
    gap: 8px;
  }
  
  .nav-buttons button {
    font-size: var(--font-size-sm);
    padding: 8px 12px;
  }
  
  /* Make difficulty controls buttons smaller and centered on mobile */
  .difficulty-controls {
    justify-content: center;
  }
  
  .difficulty-controls .mode-btn {
    font-size: var(--font-size-sm);
    padding: 8px 12px;
  }
  
  /* Stack collection items vertically on narrow screens */
  .collection-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .collection-item .actions {
    align-self: stretch;
    display: flex;
    justify-content: flex-end;
  }
  
  /* Stack verse items vertically on narrow screens */
  .verse-item {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
  }
  
  .verse-item input[type="checkbox"] {
    order: -1;
    align-self: flex-start;
    margin-top: 2px;
    width: 18px;
    height: 18px;
  }
  
  .verse-item .verse-content {
    flex: 1 1 100%;
    order: 0;
  }
  
  .verse-item .button-container {
    margin-left: 0;
    flex: 1 1 100%;
    order: 1;
    justify-content: flex-end;
  }
}

.panel {
  margin-top: 20px;
  padding: 20px;
  padding-bottom: 220px; /* Extra space for fixed keyboard */
  background: var(--panel-background);
  border-radius: 8px;
}

.verse-input-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.input-row {
  display: flex;
  gap: 16px;
}

.input-group {
  margin-bottom: 16px;
}

.input-group.half {
  flex: 1;
}

.helper-text {
  display: block;
  color: var(--text-color);
  opacity: 0.6;
  margin-top: 4px;
  font-size: var(--font-size-sm);
}

.difficulty-controls {
  display: flex;
  gap: 10px;
  margin: 16px 0;
}

.sound-control {
  margin-top: 8px;
}

.selector-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.selector-row select {
  flex: 0 0 65%;
  min-width: 0;
}

.selector-row .mute-btn {
  flex: 1;
  white-space: nowrap;
  margin: 0;
}

.learn-helper-text {
  font-size: var(--font-size-sm);
  opacity: 0.65;
  margin-bottom: 8px;
  text-align: center;
  color: var(--text-color);
  min-height: 20px;
}

.mute-btn {
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--input-border);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: var(--font-size-sm);
}

.mute-btn:hover {
  background: rgba(255,255,255,0.03);
}

.mode-btn {
  flex: 1;
  opacity: 0.7;
}

.mode-btn.active {
  opacity: 1;
  background: var(--accent-color);
}

.verse-display {
  font-family: 'Noto Sans SC', 'Kaiti', 'KaiTi', '楷体', 'Kaiti SC', 'STKaiti', sans-serif;
  font-size: var(--font-size-lg);
  line-height: calc(32px * var(--text-scale));
  margin: 20px 0;
  padding: 16px;
  background: var(--card-background);
  border-radius: 8px;
  white-space: pre-wrap;
}

.input-section {
  margin: 20px 0;
}

.visually-hidden-input {
  position: fixed !important;
  left: -9999px !important;
  top: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
  opacity: 0 !important;
  pointer-events: none !important;
  z-index: -1 !important;
}

#learnInput::placeholder {
  font-size: var(--font-size-sm);
  opacity: 0.65;
}

#progressDisplay {
  height: 4px;
  background: var(--input-background);
  border-radius: 2px;
  margin: 10px 0;
  overflow: hidden;
}

#progressDisplay .bar {
  height: 100%;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

.verse-list {
  max-height: 400px;
  overflow-y: auto;
  margin: 20px 0;
}

.verse-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  margin: 8px 0;
  background: var(--card-background);
  border-radius: 4px;
  border-left: 4px solid var(--accent-color);
}

.verse-item .reference {
  font-weight: bold;
  color: var(--correct-color);
}

.verse-item .verse-content {
  flex: 1;
  text-align: left; /* ensure verse text is left aligned */
}

.verse-item .button-container {
  margin-left: 12px;
  display: flex;
  gap: 8px;
}

.collection-tags { margin-top:6px; }
.collection-tag { display:inline-block; background: rgba(45,114,217,0.12); color: var(--correct-color); padding:4px 8px; border-radius:12px; font-size:var(--font-size-sm); margin-right:6px; }

.verse-item .last-reviewed {
  font-size: var(--font-size-sm);
  color: var(--text-color);
}

.action-buttons {
  display: flex;
  gap: 10px;
  margin: 20px 0;
}

.export-section,
.import-section {
  margin: 20px 0;
  padding: 16px;
  background: var(--card-background);
  border-radius: 8px;
}

.file-input-label {
  display: inline-block;
  background: var(--accent-color);
  color: var(--correct-color);
  padding: 8px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--font-size-base);
  margin: 10px 0;
  transition: background 0.2s;
}

.file-input-label:hover {
  background: var(--hover-color);
}

.file-name-display {
  display: inline-block;
  margin-left: 12px;
  color: var(--text-color);
  opacity: 0.7;
  font-size: var(--font-size-sm);
}

#importFile {
  margin: 10px 0;
}

/* Collections UI */
.create-collection input[type="text"] { max-width: 360px; display: inline-block; margin-right:8px; }
.collection-review { margin: 12px 0; }
.collection-item { display:flex; justify-content:space-between; align-items:center; padding:8px; margin:6px 0; background:var(--card-background); border-radius:6px; flex-wrap: wrap; gap: 8px; }
.collection-item .actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0; }
.collection-item .actions button { margin: 0; }
.collection-item .actions button:first-child { margin-right: 8px; }
/* Icon-only buttons - no background, narrower width */
.collection-item .actions button.icon-btn { 
  background: none; 
  color: var(--text-color); 
  padding: 0.5em 0.4em; 
  min-width: auto; 
  font-size: var(--font-size-lg);
  margin: 0;
}
.collection-item .actions button.icon-btn:hover { 
  background: none; 
  color: var(--accent-color); 
}
.collection-verses-item { display:flex; justify-content:space-between; align-items:center; padding:8px; margin:6px 0; background:var(--card-background); border-radius:6px; }
.collection-controls { display:flex; gap:8px; }

/* Expandable collection items in review panel */
.review-collection-item {
  background: var(--card-background);
  border-radius: 6px;
  margin: 6px 0;
  overflow: hidden;
}

.review-collection-header {
  display: flex;
  align-items: center;
  padding: 10px;
  cursor: pointer;
  gap: 10px;
}

.review-collection-header:hover {
  background: var(--input-background);
}

.collection-expand-icon {
  font-size: var(--font-size-sm);
  transition: transform 0.2s;
  user-select: none;
  min-width: 16px;
}

.collection-expand-icon.expanded {
  transform: rotate(90deg);
}

.collection-checkbox {
  margin: 0;
  width: 18px;
  height: 18px;
}

/* Book headers in add verse panel */
.book-header {
  background: var(--card-background);
}

.book-header:hover {
  background: var(--input-background);
}

.collection-title {
  flex: 1;
  font-weight: 500;
}

.collection-verse-count {
  color: var(--text-color);
  opacity: 0.6;
  font-size: 0.9em;
}

.collection-verses-list {
  display: none;
  padding: 0 10px 10px 36px;
  background: var(--input-background);
}

.collection-verses-list.expanded {
  display: block;
}

.collection-verse-item {
  padding: 6px 8px;
  margin: 4px 0;
  background: var(--card-background);
  border-radius: 4px;
  font-size: 0.95em;
  color: var(--text-color);
}

.collection-verse-item .verse-ref {
  color: var(--text-color);
  opacity: 0.7;
  margin-right: 8px;
}

/* Due date status indicators */
.overdue {
  color: #ff4444;
  font-weight: 500;
}

.due-soon {
  color: #ff9800;
  font-weight: 500;
}

.due-future {
  color: #4caf50;
}

/* Export tree structure */
.export-tree {
  background: var(--card-background);
  border-radius: 6px;
  padding: 12px;
  margin: 8px 0;
}

.tree-item {
  margin: 6px 0;
}

.tree-item label {
  display: flex;
  align-items: center;
  margin: 4px 0;
  cursor: pointer;
  user-select: none;
}

.tree-item input[type="checkbox"] {
  margin: 0 8px 0 0;
}

.tree-children {
  margin-left: 24px;
  padding-left: 12px;
  border-left: 2px solid var(--input-border);
}

.tree-children .tree-item {
  margin: 4px 0;
  font-size: 0.95em;
}

/* Onscreen Keyboards */
.onscreen-keyboard {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--panel-background);
  border-top: 1px solid var(--border-color);
  padding: 12px 8px;
  z-index: 1001;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  width: 100%;
  max-width: 100vw;
  box-sizing: border-box;
  pointer-events: auto;
  overflow-x: hidden;
}

.keyboard-row {
  display: flex;
  justify-content: center;
  margin-bottom: 8px;
  gap: 4px;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: hidden;
}

.onscreen-keyboard button {
  background: var(--button-background);
  color: var(--button-text);
  border: 1px solid var(--border-color);
  padding: 10px 8px;
  margin: 0;
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--keyboard-font-sm);
  min-width: 32px;
  flex: 1;
  max-width: 50px;
  touch-action: manipulation;
  transition: background 0.2s ease;
  pointer-events: auto;
}

#numericKeyboard button {
  padding: 12px 16px;
  min-width: 50px;
  max-width: 70px;
  font-size: var(--keyboard-font-md);
  flex: 1;
}

#cangjieKeyboard button,
#pinyinKeyboard button {
  font-size: var(--keyboard-font-base);
  padding: 12px 8px;
  min-width: 36px;
  max-width: 48px;
  flex: 1;
}

.onscreen-keyboard button:hover {
  background: var(--button-hover);
}

.onscreen-keyboard .space {
  flex: 3;
  max-width: none;
}

.onscreen-keyboard .backspace {
  background: #dc3545;
  color: white;
  touch-action: manipulation;
  flex: 1.5;
  max-width: none;
}

.onscreen-keyboard .enter {
  background: #28a745;
  color: white;
  touch-action: manipulation;
  flex: 1.5;
  max-width: none;
}

/* Add extra bottom padding when enter/backspace are hidden (portrait mode only) */
#zhuyinKeyboard.padding-compact,
#cangjieKeyboard.padding-compact,
#pinyinKeyboard.padding-compact {
  padding-bottom: 50px !important;
}

@media (orientation: landscape) {
  #zhuyinKeyboard.padding-compact,
  #cangjieKeyboard.padding-compact,
  #pinyinKeyboard.padding-compact {
    padding-bottom: 12px !important; /* Reset to normal in landscape */
  }
}

/* Mobile landscape optimization - reduce keyboard height */
@media (max-height: 500px) and (orientation: landscape) {
  .onscreen-keyboard {
    padding: 6px 8px;
  }
  
  .keyboard-row {
    gap: 3px;
    margin-bottom: 4px;
  }
  
  .onscreen-keyboard button {
    padding: 6px 8px;
    font-size: var(--keyboard-font-xs);
    min-width: 28px;
    max-width: 45px;
  }
  
  #numericKeyboard button {
    padding: 8px 12px;
    min-width: 45px;
    max-width: 60px;
    font-size: var(--keyboard-font-base);
  }
  
  /* Numeric keyboard - more aggressive reduction for 4-row layout */
  #numericKeyboard {
    padding: 5px 8px;
  }
  
  #numericKeyboard .keyboard-row {
    gap: 4px;
    margin-bottom: 5px;
  }
  
  #numericKeyboard button {
    padding: 6px 12px;
    min-width: 50px;
    max-width: 70px;
    font-size: var(--keyboard-font-md);
  }
  
  #cangjieKeyboard button,
  #pinyinKeyboard button {
    font-size: var(--keyboard-font-sm);
    padding: 6px 6px;
    min-width: 32px;
    max-width: 42px;
  }
  
  /* Zhuyin keyboard has 5 rows - needs extra aggressive reduction */
  #zhuyinKeyboard {
    padding: 5px 6px;
  }
  
  #zhuyinKeyboard .keyboard-row {
    gap: 3px;
    margin-bottom: 8px;
  }
  
  #zhuyinKeyboard button {
    padding: 4px 6px;
    font-size: var(--keyboard-font-sm);
    min-width: 26px;
    max-width: 60px;
  }
  
  #zhuyinKeyboard .backspace,
  #zhuyinKeyboard .enter {
    padding: 4px 8px;
  }
}

/* Tablet responsiveness (medium screens) */
@media (min-width: 600px) {
  .onscreen-keyboard {
    padding: 16px 12px;
  }
  
  .keyboard-row {
    gap: 6px;
    margin-bottom: 10px;
  }
  
  .onscreen-keyboard button {
    padding: 14px 12px;
    font-size: var(--keyboard-font-md);
    min-width: 42px;
    max-width: 65px;
  }
  
  #numericKeyboard button {
    padding: 16px 20px;
    min-width: 60px;
    max-width: 90px;
    font-size: var(--keyboard-font-lg);
  }
  
  #cangjieKeyboard button,
  #pinyinKeyboard button {
    font-size: var(--keyboard-font-md);
    padding: 14px 12px;
    min-width: 44px;
    max-width: 60px;
  }
}

/* Desktop responsiveness (large screens) */
@media (min-width: 768px) {
  .onscreen-keyboard {
    padding: 20px 16px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .keyboard-row {
    gap: 8px;
    margin-bottom: 12px;
  }
  
  .onscreen-keyboard button {
    padding: 16px 14px;
    font-size: var(--keyboard-font-md);
    min-width: 48px;
    max-width: 75px;
  }
  
  #numericKeyboard button {
    padding: 18px 24px;
    min-width: 70px;
    max-width: 100px;
    font-size: var(--keyboard-font-xl);
  }
  
  #cangjieKeyboard button,
  #pinyinKeyboard button {
    font-size: var(--keyboard-font-lg);
    padding: 16px 14px;
    min-width: 50px;
    max-width: 70px;
  }
}

/* Extra large screens */
@media (min-width: 1024px) {
  .onscreen-keyboard {
    max-width: 1100px;
  }
  
  .keyboard-row {
    gap: 10px;
  }
  
  .onscreen-keyboard button {
    padding: 18px 16px;
    font-size: var(--keyboard-font-lg);
    min-width: 54px;
    max-width: 85px;
  }
  
  #numericKeyboard button {
    padding: 20px 28px;
    min-width: 80px;
    max-width: 120px;
    font-size: var(--keyboard-font-2xl);
  }
  
  #cangjieKeyboard button,
  #pinyinKeyboard button {
    font-size: var(--keyboard-font-xl);
    padding: 18px 16px;
    min-width: 56px;
    max-width: 80px;
  }
}

/* Tutorial Modal Styles */
.tutorial-example {
  margin: 24px 0;
  padding: 20px;
  background: var(--card-background);
  border-radius: 8px;
  display: flex;
  justify-content: center;
}

.tutorial-table {
  border-collapse: collapse;
  margin: 0 auto;
}

.tutorial-table td {
  text-align: center;
  vertical-align: middle;
  padding: 4px 4px;
}

.tutorial-char {
  font-size: var(--font-size-3xl);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s ease, opacity 0.3s ease;
  display: inline-block;
}

.tutorial-char.tutorial-hidden {
  opacity: 0;
  color: transparent;
}

.tutorial-char.tutorial-typed {
  color: var(--correct-color);
}

.tutorial-arrows td {
  font-size: var(--font-size-lg);
  color: var(--accent-color);
  padding: 6px 4px;
}

.tutorial-keys {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--accent-color);
}

.tutorial-keys td {
  min-height: 32px;
  padding: 6px 4px;
}

.tutorial-keys span {
  opacity: 0;
  transition: opacity 0.3s ease;
  display: inline-block;
}

.tutorial-keys span.visible {
  opacity: 1;
}

.tutorial-stages-list {
  margin: 24px 0;
  text-align: left;
  background: var(--card-background);
  border-radius: 8px;
  padding: 16px;
}

.tutorial-stage-item {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.tutorial-stage-item:last-child {
  margin-bottom: 0;
}

.tutorial-stage-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  font-weight: bold;
  flex-shrink: 0;
}

.tutorial-stage-info {
  flex: 1;
}

.tutorial-stage-info h3 {
  margin: 0 0 4px 0;
  font-size: var(--font-size-md);
  color: var(--text-color);
}

.tutorial-stage-info p {
  margin: 0;
  font-size: var(--font-size-sm);
  opacity: 0.75;
}

.tutorial-start-btn {
  background: var(--card-background);
  color: var(--text-color);
}

.tutorial-start-btn:hover {
  background: var(--button-hover);
}

#tutorialBasicNote {
  margin-top: 16px;
  font-size: 0.9em;
  opacity: 0.8;
}

@media (min-width: 768px) {
  .tutorial-char {
    font-size: var(--font-size-4xl);
    min-width: 44px;
  }
  
  .tutorial-arrows span {
    min-width: 44px;
  }
  
  .tutorial-keys {
    font-size: var(--font-size-2xl);
  }
  
  .tutorial-keys span {
    min-width: 44px;
  }
}

/* Review Controls layout and disabled hint */
.review-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.review-controls #startReviewBtn,
.review-controls #changeIntervalBtn {
  min-width: 160px;
}

.btn-disabled-hint {
  opacity: 0.5;
}

@media (min-width: 768px) {
  .review-controls {
    justify-content: flex-start;
  }
  .review-controls #startReviewBtn {
    order: 1;
  }
  .review-controls #changeIntervalBtn {
    order: 2;
    margin-left: auto;
  }
}