/* Theme Variables */
:root {
  /* Default Dark Theme */
  --primary-bg: #000000;
  --card-bg: #0A0A0A;
  --text-primary: #FFFFFF;
  --text-secondary: #CCCCCC;
  --text-light: #FFFFFF;
  --accent: #808080;
  --button-bg: #1A1A1A;
  --button-text: #FFFFFF;
  --button-hover: #333333;
  --button-border: #FFFFFF;
  --button-shadow: rgba(255, 255, 255, 0.1);
  --font-family: var(--dark-english-font);
  --button-width: 180px;
  --button-height: 60px;
  --button-radius: 12px;
  --card-padding: 2.5rem;
  --font-size-base: 16px;
  --card-aspect-ratio: 16 / 9;
  --flashcard-width-ratio: 16;
  --flashcard-height-ratio: 9;
  --card-aspect-ratio: calc(var(--flashcard-width-ratio) / var(--flashcard-height-ratio));
  --vh: 1vh;
  
  /* Scrollbar variables for Dark theme */
  --scrollbar-bg: #1A1A1A;
  --scrollbar-thumb: #808080;
  --scrollbar-thumb-hover: #999999;
  
  /* Settings-controlled variables */
  --main-text-scale: 1;
  --secondary-text-scale: 1;
  --animation-speed: 0.6s;
  --enable-animations: 1;
  
  /* Default font for Japanese text */
  --japanese-font: 'M PLUS 1p', sans-serif;
  
  /* Theme-specific English fonts */
  --dark-english-font: 'Roboto', 'Segoe UI', sans-serif;
  --classic-english-font: 'Playfair Display', 'Georgia', serif;
  --light-english-font: 'Open Sans', 'Helvetica Neue', sans-serif;
}

/* Scrollbar styling for Dark theme (default) */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-bg);
  border-radius: 6px;
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 6px;
  border: 3px solid var(--scrollbar-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* Modern Light Theme - Adding a new theme option */
[data-theme="light"] {
  --primary-bg: #f5f5f7;
  --card-bg: #ffffff;
  --text-primary: #1d1d1f;
  --text-secondary: #494949;
  --text-light: #333333;
  --accent: #666666;
  --button-bg: #e8e8ed;
  --button-text: #1d1d1f;
  --button-hover: #d8d8d8;
  --button-border: #90cdf4;
  --button-shadow: rgba(0, 0, 0, 0.05);
  --font-family: var(--light-english-font);
  
  /* Scrollbar variables for Light theme */
  --scrollbar-bg: #e8e8ed;
  --scrollbar-thumb: #666666;
  --scrollbar-thumb-hover: #494949;
}

/* Firefox scrollbar styling */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-bg);
}

/*******************************
 * Base Styles
 *******************************/
body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--primary-bg);
  color: var(--text-light);
  text-align: center;
  line-height: 1.8;
  transition: background-color 0.3s ease, color 0.3s ease;
  font-size: var(--font-size-base);
}

/* Smooth transitions for theme changes */
h1, p, button, #kanji-text, #meaning, #hiragana-text {
  transition: font-family 0.3s ease, color 0.3s ease, font-weight 0.3s ease, letter-spacing 0.3s ease;
}

/*******************************
 * Header Styles
 *******************************/
header {
  background: var(--card-bg);
  color: var(--text-light);
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  position: relative;
}

header h1 {
  margin: 0;
  font-size: 2.8rem;
  letter-spacing: 2px;
  line-height: 1.3;
  color: var(--text-primary);
}

header p {
  margin: 0.8rem 0 0;
  font-size: 1.4rem;
  color: var(--text-light);
  opacity: 0.9;
}

/*******************************
 * Language Selector
 *******************************/
#language-selector {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 10px;
}

#language-select {
  padding: 0.8rem 1.2rem;
  height: 52px;
  background: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--text-primary);
  border-radius: var(--button-radius);
  cursor: pointer;
  font-family: var(--font-family);
  letter-spacing: 0.05em;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  -webkit-appearance: none;
  appearance: none;
}

#language-select:hover {
  background: var(--button-hover);
  color: var(--button-text);
  border-color: var(--text-primary);
}

#language-select option {
  background: var(--button-bg);
  color: var(--button-text);
  padding: 0.5rem;
}

/*******************************
 * Mode Selector
 *******************************/
#mode-selector {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

#dataset-select,
#theme-select {
  padding: 0.8rem 1.2rem;
  height: 52px;
  border-radius: var(--button-radius);
  background: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

#dataset-select:hover,
#theme-select:hover {
  background: var(--button-hover);
  color: var(--button-text);
  border-color: var(--text-primary);
}

#dataset-select option,
#theme-select option {
  background: var(--button-bg);
  color: var(--button-text);
  padding: 0.5rem;
}

/*******************************
 * Flashcard Container & Card
 *******************************/
#flashcard-container {
  width: 85%;  /* Increased from 70% to make card bigger */
  max-width: 900px;  /* Increased from 700px for larger maximum size */
  margin: 0 auto;
  padding: 0 1rem;
  box-sizing: border-box;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: auto; /* Let height be determined by aspect ratio */
}

.card {
  aspect-ratio: var(--card-aspect-ratio); /* Use the custom aspect ratio */
  width: 100%;
  position: relative;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  background: var(--card-bg);
  transform-style: preserve-3d;
  transition: transform calc(var(--animation-speed) * var(--enable-animations)) cubic-bezier(0.4, 0.2, 0.2, 1);
  perspective: 1500px; /* Add perspective for better 3D effect */
  touch-action: manipulation;
  user-select: none;
}

/* Adjust content layout for landscape orientation */
.front, .back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: calc(var(--card-padding) * 0.7) calc(var(--card-padding) * 1.2);
  box-sizing: border-box;
  transition: transform calc(var(--animation-speed) * var(--enable-animations)) cubic-bezier(0.4, 0.2, 0.2, 1);
  color: var(--text-primary);
  background-color: var(--card-bg);
  border-radius: 20px;
  transform-style: preserve-3d;
}

.front {
  opacity: 1;
  pointer-events: auto;
  z-index: 2;
  transform: rotateY(0deg);
  transition: transform calc(var(--animation-speed) * var(--enable-animations)) cubic-bezier(0.4, 0.2, 0.2, 1);
}

.back {
  opacity: 1;
  pointer-events: none;
  transform: rotateY(180deg);
  background: var(--card-bg);
  border-radius: 20px;
  transition: transform calc(var(--animation-speed) * var(--enable-animations)) cubic-bezier(0.4, 0.2, 0.2, 1);
}

/* Card Flip Animation */
.card.flipped {
  transform: rotateY(180deg);
}

.card.flipped .front {
  opacity: 0;
  pointer-events: none;
  transition: 
    transform calc(var(--animation-speed) * var(--enable-animations)) cubic-bezier(0.4, 0.2, 0.2, 1),
    opacity 0s calc(var(--animation-speed) * var(--enable-animations));
}

.card.flipped .back {
  opacity: 1;
  pointer-events: auto;
  transition: 
    transform calc(var(--animation-speed) * var(--enable-animations)) cubic-bezier(0.4, 0.2, 0.2, 1),
    opacity 0s;
}

/* Card Action Buttons Container */
.action-buttons {
  position: absolute;
  bottom: calc(var(--card-padding) * 0.8);
  left: 0;
  right: 0;
  display: flex;
  justify-content: flex-end;
  padding: 0 calc(var(--card-padding) * 1.2);
  box-sizing: border-box;
  width: 100%;
}

.card-button {
  font-size: 1rem;
  padding: 0.6rem 1rem;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--button-border);
  border-radius: var(--button-radius);
  cursor: pointer;
  transition: all 0.3s ease;
}

.card-button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

.card-button:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

#play-button {
  position: absolute;
  left: calc(var(--card-padding) * 1.2);
  bottom: 0;
  background: var(--button-bg);
  color: var(--button-text);
  padding: 0.6rem 1rem;
  font-size: 1rem;
  border-radius: var(--button-radius);
  border: 2px solid var(--button-border);
  cursor: pointer;
  transition: all 0.3s ease;
}

#play-button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

#play-button:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

/* Button tooltips */
button[title]:hover::after {
  content: attr(title);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 10px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  border-radius: 4px;
  font-size: 0.8rem;
  white-space: nowrap;
  pointer-events: none;
  margin-bottom: 5px;
  z-index: 100;
}

[data-mode="hiragana"] .action-buttons {
  justify-content: center;
}

/* Card Content Styling */
#card-number,
#part-of-speech {
  position: absolute;
  top: 0.8125rem;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--text-primary);
  z-index: 1;
}

#card-number {
  left: 1.5rem;
}

#part-of-speech {
  right: 1.5rem;
}

#romanized-spelling {
  position: absolute;
  right: 20px;
  bottom: 0;
  width: 180px;
  min-width: 180px;
  height: 65px;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-size: 1.8rem;
  color: var(--text-primary);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.3s ease, opacity 0.3s ease;
  font-style: italic;
  background-color: var(--button-bg);
  border: 1px solid var(--text-secondary);
  border-radius: var(--button-radius);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  z-index: 10;
  pointer-events: auto;
  cursor: pointer;
  transform: translateX(10px);
}

#romanized-spelling.visible {
  transform: translateX(0);
  opacity: 1;
  visibility: visible;
}

/* Add a new class for text size scaling */
#romanized-spelling span {
  font-size: clamp(0.8rem, calc(180px / (var(--text-length, 10) * 1.2)), 1.8rem);
  padding: 0.5rem;
  max-width: 100%;
  word-break: break-word;
}

/* Adjust kanji text for landscape orientation */
#kanji-text {
  font-family: 'M PLUS 1p', sans-serif;
  font-weight: 300;
  font-size: calc(120px * var(--main-text-scale));
  margin-bottom: 10px;
  text-align: center;
  line-height: 1.25;
  user-select: none;
}

/* Make hiragana mode front text 15% bigger */
.hiragana-mode #kanji-text {
  font-size: calc(138px * var(--main-text-scale)); /* 120px * 1.15 = 138px */
}

#hiragana-text {
  font-family: 'M PLUS 1p', sans-serif;
  font-weight: 300;
  font-size: calc(32px * var(--secondary-text-scale));
  margin-bottom: 16px;
  text-align: center;
}

#meaning {
  font-size: calc(clamp(1.3rem, 3.5vw, 2rem) * var(--secondary-text-scale));
  text-align: center;
  margin: 0.4rem 0 0.8rem;
  color: var(--text-primary);
  font-weight: 600;
  transition: all 0.3s ease;
  max-width: 85%;
}

#exampleJP, #exampleEN {
  font-size: calc(1.4rem * var(--secondary-text-scale));
  color: var(--text-light);
  opacity: 0.9;
  margin: 0.5rem 0;
  display: block;
}

.character-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/*******************************
 * Back Side Styling
 *******************************/
.back .character-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 90%; /* Reduced from 100% to create more whitespace */
  gap: 0.5rem;
}

/* Position and style each element on the back */
.back #hiragana-text {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.back #meaning {
  font-size: clamp(1.6rem, 4.5vw, 2.6rem);
  margin: 0.5rem 0 1rem;
  color: var(--text-primary);
  font-weight: 600;
  max-width: 85%;
}

.back #exampleJP, 
.back #exampleEN {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-light);
  opacity: 0.9;
  margin: 0.4rem 0;
  max-width: 90%;
  position: relative;
  text-align: center;
  line-height: 1.5;
  width: 100%;
  display: inline-block;
}

/* Hiragana Mode Styling */
.back.hiragana-mode {
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
}

.back.hiragana-mode .character-container {
  padding-top: 3rem;
}

.back.hiragana-mode #meaning {
  font-size: 3.2rem;
  color: var(--text-light);
  margin-top: 2rem;
  font-weight: bold;
}

.back.hiragana-mode #hiragana-text {
  font-size: 4.5rem;
  color: var(--text-primary);
  margin: 0.5rem 0;
  font-weight: 400;
}

.back:not(.hiragana-mode) #hiragana-text {
  display: none;
}

/*******************************
 * Controls and Progress Bar
 *******************************/
#controls-wrapper {
  width: 85%; /* Match the card width */
  max-width: 900px; /* Match card max-width */
  margin: 0 auto;
  position: relative;
}

#controls {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin: 1.2rem auto;
  gap: 1rem;
}

#back-button, 
#flip-button, 
#next-button {
  padding: 0.8rem 1.2rem;
  height: 52px;
  background: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--button-border);
  border-radius: var(--button-radius);
  cursor: pointer;
  font-family: var(--font-family);
  font-weight: normal;
  letter-spacing: 0.05em;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  -webkit-appearance: none;
  appearance: none;
  
  /* Add flexbox alignment to match select height */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-width: 180px; /* Match --button-width variable */
}

/* Exact hover state match */
#back-button:hover, 
#flip-button:hover, 
#next-button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

#progress-container {
  position: relative;
  width: calc(100% - 36px); /* 18px smaller on each side */
  height: 20px; /* Increased height to fit text inside */
  background: var(--button-bg);
  border-radius: 10px;
  padding: 3px;
  box-shadow: 0 2px 8px var(--button-shadow);
  cursor: pointer;
  transition: height 0.2s ease, background-color 0.2s ease;
  overflow: visible;
  margin: calc(1.5rem - 2px) auto 1.5rem; /* Reduced top margin by 2px */
}

#progress-container:hover {
  height: 24px;
  background-color: var(--button-hover); /* Lighten on hover */
  box-shadow: 0 2px 10px var(--button-shadow);
}

#progress-container.dragging {
  height: 26px;
  background-color: var(--text-secondary); /* Different color while dragging */
  box-shadow: 0 2px 12px var(--button-shadow);
}

/* Add the tooltip styling for progress bar hover */
.progress-preview-tooltip {
  position: absolute;
  top: -30px;
  transform: translateX(-50%);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  pointer-events: none;
  opacity: 0.9;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  z-index: 100;
  white-space: nowrap;
}

.progress-preview-tooltip::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--bg-primary);
}

#progress-fill {
  height: 100%;
  width: 100%;
  border-radius: 8px;
  background-color: var(--button-bg);
  overflow: hidden;
  position: relative;
}

#progress-bar {
  height: 100%;
  background-color: var(--accent);
  border-radius: 6px;
  transition: width 0.3s ease;
  position: relative;
  pointer-events: none;
  min-width: 10px;
}

#progress-text {
  position: absolute;
  right: 10px; /* Position from right edge */
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  color: var(--button-text); /* Make it visible on colored background */
  font-weight: 600;
  transition: all 0.3s ease;
  z-index: 10;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3); /* Add shadow for better visibility */
  white-space: nowrap; /* Prevent text wrapping */
}

/* Remove hover styles for progress text */
#progress-container:hover #progress-text {
  transform: translateY(-50%);
}

/* Control Buttons */
#controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

/* Style all control buttons to match the screenshot's close button */
#back-button, 
#flip-button, 
#next-button,
#settings-close-button {
  display: inline-block;
  padding: 12px 30px;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--button-border);
  border-radius: var(--button-radius);
  font-size: 16px;
  font-weight: normal;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  margin: 0 10px;
}

#back-button:hover, 
#flip-button:hover, 
#next-button:hover,
#settings-close-button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

#back-button:active, 
#flip-button:active, 
#next-button:active,
#settings-close-button:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

/* Remove the previous styles for settings button */
.settings-active #back-button,
.settings-active #next-button,
.settings-active #flip-button {
  display: none;
}

/* Settings close button - standalone for settings panel */
#settings-close-button {
  margin: 0;
  width: calc(100% - 2rem);
  padding: 0.75rem 1.5rem;
  background-color: var(--accent);
  color: var(--primary-text);
  border: 2px solid var(--accent);
  border-radius: 6px;
  font-size: 1rem;
  font-weight: normal;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all 0.2s ease;
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  z-index: 10;
}

/* Add space at the bottom of the settings panel for the button */
.settings-mode {
  position: relative;
  padding-bottom: 80px !important;
}

@media screen and (max-width: 480px) {
  #back-button, 
  #flip-button, 
  #next-button,
  #settings-close-button {
    padding: 10px 20px;
    font-size: 14px;
  }
  
  .settings-mode {
    padding-bottom: 70px !important;
  }
}

/* Override any theme-specific button styles */

/*******************************
 * Theme-specific adjustments
 *******************************/

/* Theme-specific adjustments for Light theme */
[data-theme="light"] h1 {
  color: var(--text-primary);
}

[data-theme="light"] p {
  color: var(--text-light);
}

[data-theme="light"] #kanji-text {
  color: var(--text-primary);
}

[data-theme="light"] #meaning {
  color: var(--text-primary);
}

[data-theme="light"] button {
  color: var(--button-text);
  background-color: var(--button-bg);
}

[data-theme="light"] #progress-text {
  color: var(--text-primary);
}

[data-theme="light"] .card {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.05);
  background-color: var(--card-bg);
}

[data-theme="light"] #card-number,
[data-theme="light"] #part-of-speech {
  color: var(--text-secondary);
}

[data-theme="light"] #romanized-spelling {
  background-color: var(--button-bg);
  border: 1px solid var(--text-secondary);
  color: var(--text-primary);
}

[data-theme="light"] #play-button,
[data-theme="light"] #dummy-button {
  border: 1px solid rgba(0, 0, 0, 0.1);
  background-color: var(--button-bg);
  color: var(--button-text);
}

[data-theme="light"] header {
  background: var(--card-bg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .back.hiragana-mode #hiragana-text {
  font-family: var(--light-english-font);
}

/* The theme-specific border colors are now defined in the theme variables */

/*******************************
 * Media Queries for Responsive Design
 *******************************/
@media screen and (max-width: 768px) {
  :root {
    --card-padding: 1.2rem;
    --button-height: 50px;
  }
  
  header h1 {
    font-size: 2.2rem;
  }
  
  header p {
    font-size: 1.1rem;
  }
  
  #mode-selector,
  #language-selector {
    position: static;
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    width: 100%;
  }
  
  header {
    flex-direction: column;
    text-align: center;
    padding: 2rem 1rem;
  }
  
  .card {
    width: 90%;
    max-width: 600px;
  }
  
  #kanji-text {
    font-size: 3.5rem;
  }
  
  /* Make hiragana mode front text 15% bigger in mobile view */
  .hiragana-mode #kanji-text {
    font-size: 4.025rem; /* 3.5rem * 1.15 = 4.025rem */
  }
  
  #meaning {
    font-size: 2.5rem;
  }
  
  #romanized-spelling {
    bottom: 0;
    min-width: 140px;
    width: 140px;
    height: 50px;
    background-color: var(--button-bg);
    border: 1px solid var(--text-secondary);
    right: 20px;
    z-index: 10;
  }
  
  .back #meaning {
    font-size: 2.5rem;
  }
  
  .back .character-container {
    padding-top: 2rem;
  }
  
  .back #hiragana-text {
    font-size: 2.2rem;
  }
  
  .back #exampleJP, 
  .back #exampleEN {
    font-size: 1.2rem;
    max-width: 90%;
  }
  
  #controls {
    padding: 1rem 0;
  }
  
  button {
    font-size: 1rem;
    padding: 0.8rem 1.5rem;
  }
  
  .back.hiragana-mode #meaning {
    font-size: 2.5rem;
  }
  
  .back.hiragana-mode #hiragana-text {
    font-size: 3.5rem;
  }
  
  .back.hiragana-mode .character-container {
    padding-top: 3rem;
  }
  
  #dummy-button {
    min-width: 140px;
    width: 140px;
    height: 50px;
    font-size: 1.1rem;
    padding: 0.6rem 1rem;
    position: absolute;
    right: 20px;
    bottom: 0;
    z-index: 5;
  }
  
  .dummy-hover-area {
    width: 140px;
  }
  
  #know-word-button {
    min-width: 140px;
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
  }
  
  #language-selector {
    position: static;
    margin-top: 1rem;
    justify-content: center;
    gap: 0.6rem;
  }
}

@media screen and (max-width: 480px) {
  :root {
    --card-padding: 1rem;
    --button-height: 45px;
    --font-size-base: 12px;
    --card-aspect-ratio: 4 / 3; /* More squared aspect ratio for small screens */
  }
  
  body {
    font-size: var(--font-size-base);
  }
  
  header {
    padding: 1.2rem 0.8rem;
    margin-bottom: 1.5rem;
  }
  
  header h1 {
    font-size: 1.8rem;
  }
  
  header p {
    font-size: 1rem;
    max-width: 90%;
    margin: 0.2rem auto;
  }
  
  #mode-selector,
  #language-selector {
    padding: 0.5rem;
    margin-top: 0.5rem;
    position: static;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  #dataset-select,
  #theme-select,
  #language-select {
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
    height: 42px;
    border-width: 1px;
  }
  
  #settings-button {
    width: 42px;
    height: 42px;
    padding: 0.6rem;
    border-width: 1px;
  }
  
  #settings-button svg {
    width: 20px;
    height: 20px;
  }
  
  .card {
    border-radius: 15px;
    max-height: none; /* Remove max-height to allow proper scaling */
    margin-bottom: 1rem;
  }
  
  #kanji-text {
    font-size: 2.5rem;
    margin: 0.5rem 0;
  }
  
  /* Make hiragana mode front text 15% bigger in extra small mobile view */
  .hiragana-mode #kanji-text {
    font-size: 2.875rem; /* 2.5rem * 1.15 = 2.875rem */
  }
  
  #romanized-spelling {
    bottom: 0;
    min-width: 120px;
    width: 120px;
    height: 45px;
    background-color: var(--button-bg);
    border: 1px solid var(--text-secondary);
    right: 20px;
    z-index: 10;
    font-size: 1.2rem;
  }
  
  .back #meaning {
    font-size: 2rem;
    margin: 0.3rem 0 0.8rem;
  }
  
  .back .character-container {
    padding-top: 1.5rem;
  }
  
  .back #hiragana-text {
    font-size: 1.8rem;
    margin-bottom: 0.3rem;
  }
  
  .back #exampleJP, 
  .back #exampleEN {
    font-size: 0.95rem;
    line-height: 1.4;
    margin: 0.3rem 0;
    max-width: 95%;
  }
  
  /* Create a second row for more buttons if needed */
  #controls {
    flex-wrap: wrap;
  }
  
  #language-selector {
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
  }
  
  #dummy-button {
    min-width: 120px;
    width: 120px;
    height: 45px;
    font-size: 0.9rem;
    padding: 0.5rem 0.8rem;
    position: absolute;
    right: 20px;
    bottom: 0;
    z-index: 5;
  }
}

/* Extra small devices */
@media screen and (max-width: 360px) {
  :root {
    --card-padding: 0.7rem;
    --card-aspect-ratio: 1 / 1; /* Square cards for very small screens */
  }
  
  header h1 {
    font-size: 1.5rem;
  }
  
  #kanji-text {
    font-size: 2.5rem;
  }
  
  .back #meaning {
    font-size: 1.6rem;
  }
  
  .back #hiragana-text {
    font-size: 1.5rem;
  }
  
  #back-button, 
  #flip-button, 
  #next-button {
    min-width: 70px;
    padding: 0.5rem 0.8rem;
    font-size: 0.8rem;
  }
  
  .action-buttons {
    bottom: 0.6rem;
  }
  
  #play-button,
  #dummy-button {
    height: 35px;
    min-width: 60px;
    width: auto;
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
  }
  
  .dummy-hover-area {
    width: 60px;
    height: 35px;
  }
  
  #know-word-button {
    min-width: 90px;
    width: 90px;
    height: 35px;
    font-size: 0.75rem;
    padding: 0.3rem 0.5rem;
    right: 0.6rem;
    bottom: 0.6rem;
  }
  
  #romanized-spelling {
    bottom: 0;
    min-width: 100px;
    width: 100px;
    height: 35px;
    font-size: 0.9rem;
    z-index: 10;
  }
  
  #dummy-button {
    min-width: 100px;
    width: 100px;
    height: 35px;
    font-size: 0.8rem;
    padding: 0.4rem 0.6rem;
    z-index: 5;
  }
  
  #language-selector {
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    width: 100%;
    justify-content: center;
  }
  
  #language-select,
  #dataset-select,
  #theme-select {
    width: 100%;
    max-width: 200px;
    margin: 0 auto;
  }
  
  #mode-selector {
    width: 100%;
    justify-content: center;
    gap: 0.5rem;
  }
}

#dummy-button {
  position: absolute;
  right: 20px;
  bottom: 0;
  background: var(--button-bg);
  color: var(--button-text);
  padding: 1rem 2rem;
  border-radius: var(--button-radius);
  border: 2px solid var(--button-border);
  cursor: pointer;
  transition: all 0.3s ease;
  min-width: 180px;
  width: 180px;
  height: 65px;
  font-size: 1.3rem;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  visibility: visible;
  z-index: 5;
  transform: translateX(0);
}

#dummy-button.hidden {
  transform: translateX(-10px);
  opacity: 0;
  visibility: hidden;
}

/* Hover on desktop devices */
@media (hover: hover) {
  #dummy-button:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
    border-color: var(--accent);
    opacity: 0;
    visibility: hidden;
  }

  #dummy-button:hover + #romanized-spelling {
    opacity: 1;
    visibility: visible;
    transform: translateX(0); /* Add transform for consistency with click behavior */
  }
  
  /* When romanized text is being hovered, keep it visible */
  #romanized-spelling:hover {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
  }
}

/* No hover effect for touch devices - we'll handle that with JavaScript */
@media (hover: none) {
  #dummy-button:hover {
    opacity: 1;
    visibility: visible;
  }
  
  /* Make sure the hover effect doesn't cascade on touch devices */
  #dummy-button:hover + #romanized-spelling {
    opacity: 0;
    visibility: hidden;
  }
}

#play-button::before {
  content: "♪";
  margin-right: 0.3rem;
}

/*******************************
 * Settings
 *******************************/
#settings-container {
  display: flex;
  align-items: center;
}

#settings-button {
  padding: 0.8rem;
  width: 52px;
  height: 52px;
  background: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--button-border);
  border-radius: var(--button-radius);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

#settings-button svg {
  width: 24px;
  height: 24px;
  transition: transform calc(var(--animation-speed) * var(--enable-animations)) ease;
  color: var(--text-primary);
}

#settings-button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

#settings-button:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

#settings-button.active svg {
  transform: rotate(90deg);
}

/* Settings Panel Styling */
#settings-panel {
  background-color: var(--card-bg);
  color: var(--text-light);
  border-radius: 20px;
  padding: 2rem;
  width: calc(100% - 4rem);
  height: calc(100% - 4rem);
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  z-index: 50;
  transition: opacity 0.3s ease;
  opacity: 1;
  visibility: visible;
  position: absolute;
  top: 0;
  left: 0;
  transform: rotateY(0deg) !important;
  backface-visibility: visible;
}

#settings-panel.hidden {
  opacity: 0;
  visibility: hidden;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--accent);
}

.settings-title {
  font-size: 2rem;
  margin: 0;
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: 0.5px;
}

#close-settings {
  background: var(--button-bg);
  border: 2px solid var(--button-border);
  color: var(--text-secondary);
  font-size: 2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--button-radius);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

#close-settings:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
  color: var(--text-primary);
}

#close-settings:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.settings-group {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.settings-subtitle {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin: 0 0 1.2rem 0;
  font-weight: 500;
}

/* Theme Options */
.theme-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.theme-option {
  position: relative;
  padding: 1rem;
  border-radius: 12px;
  background: var(--button-bg);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

.theme-option:hover {
  background: var(--button-hover);
}

.theme-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  cursor: pointer;
}

.theme-option input[type="radio"]:checked + span {
  color: var(--text-primary);
}

.theme-option input[type="radio"]:checked ~ .theme-option {
  border-color: var(--accent);
  background: var(--button-hover);
}

/* Slider Styling */
.slider-group {
  margin-bottom: 1.5rem;
  position: relative;
}

.slider-group:last-child {
  margin-bottom: 0;
}

.slider-group label {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.slider-group input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--button-bg);
  border-radius: 3px;
  margin: 1rem 0;
  position: relative;
}

/* Add middle marker to sliders */
.slider-group input[type="range"]::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 12px;
  background-color: var(--accent);
  z-index: 1;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border: 2px solid var(--card-bg);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s ease;
  position: relative;
  z-index: 2;
}

.slider-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-value {
  float: right;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: -2.5rem;
  background: var(--button-bg);
  padding: 0.3rem 0.8rem;
  border-radius: 12px;
}

/* Checkbox Styling */
.checkbox-group {
  margin-top: 1.5rem;
}

.checkbox-option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem;
  border-radius: 12px;
  transition: background-color 0.2s ease;
  cursor: pointer;
}

.checkbox-option:hover {
  background-color: var(--button-bg);
}

.checkbox-option input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--accent);
  border-radius: 6px;
  outline: none;
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
}

.checkbox-option input[type="checkbox"]:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}

.checkbox-option input[type="checkbox"]:checked::before {
  content: "✓";
  position: absolute;
  color: var(--card-bg);
  font-size: 14px;
  font-weight: bold;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Mobile Optimization */
@media screen and (max-width: 480px) {
  #settings-panel {
    padding: 1.5rem;
    width: calc(100% - 3rem);
    height: calc(100% - 3rem);
  }

  .settings-header {
    margin-bottom: 1.5rem;
  }

  .settings-title {
    font-size: 1.5rem;
  }

  .settings-group {
    padding: 1.2rem;
    margin-bottom: 1rem;
  }

  .theme-options {
    grid-template-columns: 1fr;
  }

  .theme-option {
    padding: 0.8rem;
  }

  .slider-group label {
    font-size: 0.9rem;
  }

  .checkbox-option {
    padding: 0.6rem;
  }
}

/* Touch Device Optimizations */
.touch-device .theme-option,
.touch-device .checkbox-option,
.touch-device input[type="range"],
.touch-device #close-settings {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.touch-device .slider-group input[type="range"]::-webkit-slider-thumb {
  width: 24px;
  height: 24px;
}

.touch-device .checkbox-option input[type="checkbox"] {
  width: 24px;
  height: 24px;
}

/* Default theme (Dark) English font */
#meaning,
#exampleEN,
header h1,
header p,
#language-select,
#dataset-select,
#progress-text,
button,
.settings-header h2,
.settings-subtitle,
.checkbox-option,
.slider-group label,
.slider-value,
.back.hiragana-mode #meaning {
  font-family: var(--dark-english-font);
}

/* Maintain Japanese font for Japanese elements */
#kanji-text,
#hiragana-text:not(.back.hiragana-mode #hiragana-text),
#exampleJP {
  font-family: var(--japanese-font);
}

/* Light theme English font */
[data-theme="light"] #meaning,
[data-theme="light"] #exampleEN,
[data-theme="light"] header h1,
[data-theme="light"] header p,
[data-theme="light"] #language-select,
[data-theme="light"] #dataset-select,
[data-theme="light"] #progress-text,
[data-theme="light"] button,
[data-theme="light"] .settings-header h2,
[data-theme="light"] .settings-subtitle,
[data-theme="light"] .checkbox-option,
[data-theme="light"] .slider-group label,
[data-theme="light"] .slider-value,
[data-theme="light"] .back.hiragana-mode #meaning,
[data-theme="light"] .back.hiragana-mode #hiragana-text {
  font-family: var(--light-english-font);
}

/* Add more specific button styles to ensure borders are visible */
body #controls #back-button, 
body #controls #flip-button, 
body #controls #next-button {
  border: 2px solid var(--button-border);
  background-color: var(--button-bg);
  color: var(--button-text);
}

body #controls #back-button:hover, 
body #controls #flip-button:hover, 
body #controls #next-button:hover {
  border-color: var(--accent);
  background-color: var(--button-hover);
}