:root {
  /* Toss 스타일 색상 팔레트 */
  --color-primary: #3182ce;
  --color-primary-hover: #2c5aa0;
  --color-primary-active: #2a4d84;
  --color-secondary: #f7fafc;
  --color-secondary-hover: #edf2f7;
  --color-secondary-active: #e2e8f0;
  
  /* 배경 및 표면 */
  --color-background: #ffffff;
  --color-surface: #ffffff;
  --color-card: #ffffff;
  
  /* 텍스트 */
  --color-text: #1a202c;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #718096;
  --color-text-disabled: #a0aec0;
  
  /* 테두리 */
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e0;
  --color-border-focus: #3182ce;
  
  /* 상태 색상 */
  --color-success: #38a169;
  --color-success-bg: #f0fff4;
  --color-error: #e53e3e;
  --color-error-bg: #fed7d7;
  --color-warning: #d69e2e;
  --color-warning-bg: #fffbeb;
  --color-info: #3182ce;
  --color-info-bg: #ebf8ff;
  
  /* 난이도 색상 */
  --color-easy: #38a169;
  --color-medium: #d69e2e;
  --color-hard: #e53e3e;
  
  /* 타이포그래피 */
  --font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* 크기 */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  /* 간격 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* 반지름 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* 그림자 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  
  /* 애니메이션 */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0.0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* 다크모드 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1a202c;
    --color-surface: #2d3748;
    --color-card: #2d3748;
    --color-text: #f7fafc;
    --color-text-secondary: #e2e8f0;
    --color-text-tertiary: #cbd5e0;
    --color-text-disabled: #718096;
    --color-border: #4a5568;
    --color-border-hover: #718096;
    --color-secondary: #4a5568;
    --color-secondary-hover: #718096;
    --color-secondary-active: #a0aec0;
  }
}

[data-theme="dark"] {
  --color-background: #1a202c;
  --color-surface: #2d3748;
  --color-card: #2d3748;
  --color-text: #f7fafc;
  --color-text-secondary: #e2e8f0;
  --color-text-tertiary: #cbd5e0;
  --color-text-disabled: #718096;
  --color-border: #4a5568;
  --color-border-hover: #718096;
  --color-secondary: #4a5568;
  --color-secondary-hover: #718096;
  --color-secondary-active: #a0aec0;
}

/* 모션 감소 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

[data-motion="reduced"] *,
[data-motion="reduced"] *::before,
[data-motion="reduced"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}

/* 기본 스타일 */
* {
  box-sizing: border-box;
}

html {
  font-family: var(--font-family);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-background);
  color: var(--color-text);
  min-height: 100vh;
  font-size: var(--text-base);
  transition: background-color var(--duration-normal) var(--ease-out);
}

/* 접근성 컨트롤 */
.accessibility-controls {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  display: flex;
  gap: var(--space-2);
  z-index: 1000;
}

.accessibility-controls .btn {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--color-border);
}

/* 컨테이너 */
.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: var(--space-3);
  min-height: 100vh;
}

@media (min-width: 640px) {
  .container {
    padding: var(--space-4);
    max-width: 900px;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1100px;
    padding: var(--space-5);
  }
}

/* 화면 전환 */
.screen {
  display: none;
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 히어로 섹션 */
.hero-section {
  text-align: center;
  padding: var(--space-6) 0 var(--space-4);
}

.hero-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translate3d(0,0,0);
  }
  40%, 43% {
    transform: translate3d(0,-8px,0);
  }
  70% {
    transform: translate3d(0,-4px,0);
  }
  90% {
    transform: translate3d(0,-2px,0);
  }
}

.hero-section h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin: 0 0 var(--space-4) 0;
  letter-spacing: -0.025em;
}

.subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-top: var(--space-6);
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: 1;
}

.stat-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* 퀴즈 유형 카드 */
.quiz-types {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

@media (min-width: 640px) {
  .quiz-types {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
}

@media (min-width: 1024px) {
  .quiz-types {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }
}

.quiz-type-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  position: relative;
  overflow: hidden;
  min-height: 120px;
}

.quiz-type-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--ease-out);
}

.quiz-type-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-hover);
}

.quiz-type-card:hover::before {
  transform: scaleX(1);
}

.quiz-type-card:active {
  transform: translateY(0);
}

.card-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.card-content {
  flex: 1;
}

.card-content h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin: 0 0 var(--space-2) 0;
  letter-spacing: -0.025em;
}

.card-content p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-3) 0;
  line-height: 1.5;
}

.quiz-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.quiz-count {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  font-weight: var(--font-weight-medium);
}

.quiz-difficulty {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

.quiz-difficulty.easy {
  background: var(--color-success-bg);
  color: var(--color-easy);
}

.quiz-difficulty.medium {
  background: var(--color-warning-bg);
  color: var(--color-medium);
}

.quiz-difficulty.hard {
  background: var(--color-error-bg);
  color: var(--color-hard);
}

.card-arrow {
  font-size: var(--text-lg);
  color: var(--color-text-tertiary);
  transition: all var(--duration-normal) var(--ease-out);
}

.quiz-type-card:hover .card-arrow {
  color: var(--color-primary);
  transform: translateX(2px);
}

/* 버튼 스타일 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  text-decoration: none;
  font-family: inherit;
  position: relative;
  overflow: hidden;
}

.btn:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

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

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.btn--secondary {
  background: var(--color-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
}

.btn--lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-lg);
  border-radius: var(--radius-xl);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* 퀴즈 헤더 */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.quiz-progress {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  max-width: 300px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--ease-out);
}

.progress-text {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* 질문 카드 */
.question-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-bottom: var(--space-4);
}

.question-card .card__body {
  padding: var(--space-5);
}

.question-card h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin: 0 0 var(--space-6) 0;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  letter-spacing: -0.025em;
}

.question-text {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  padding: var(--space-6);
  background: var(--color-secondary);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-primary);
}

/* 답안 옵션 */
.answer-options {
  margin-bottom: var(--space-8);
}

.option {
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  background: var(--color-surface);
  font-size: var(--text-base);
  line-height: 1.5;
}

.option:hover {
  border-color: var(--color-primary);
  background: var(--color-info-bg);
  transform: translateY(-1px);
}

.option.selected {
  border-color: var(--color-primary);
  background: var(--color-info-bg);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.option.correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
  color: var(--color-success);
}

.option.incorrect {
  border-color: var(--color-error);
  background: var(--color-error-bg);
  color: var(--color-error);
}

.option.disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

/* 텍스트 입력 */
.text-input {
  width: 100%;
  padding: var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-lg);
  font-family: inherit;
  background: var(--color-surface);
  color: var(--color-text);
  transition: all var(--duration-normal) var(--ease-out);
  margin-bottom: var(--space-6);
}

.text-input:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.text-input.correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
}

.text-input.incorrect {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

/* 참/거짓 버튼 */
.tf-buttons {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.tf-button {
  flex: 1;
  padding: var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  font-family: inherit;
}

.tf-button:hover {
  border-color: var(--color-primary);
  background: var(--color-info-bg);
  transform: translateY(-1px);
}

.tf-button.selected {
  border-color: var(--color-primary);
  background: var(--color-info-bg);
  color: var(--color-primary);
}

.tf-button.correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
  color: var(--color-success);
}

.tf-button.incorrect {
  border-color: var(--color-error);
  background: var(--color-error-bg);
  color: var(--color-error);
}

/* 피드백 */
.feedback {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
  border-left: 4px solid;
  background: var(--color-surface);
}

.feedback.correct {
  background: var(--color-success-bg);
  border-left-color: var(--color-success);
  color: var(--color-success);
}

.feedback.incorrect {
  background: var(--color-error-bg);
  border-left-color: var(--color-error);
  color: var(--color-error);
}

.feedback h4 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
}

.feedback p {
  margin: 0;
  line-height: 1.6;
  color: var(--color-text);
}

/* 질문 액션 */
.question-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.question-actions .btn {
  min-width: 120px;
}

/* 사전 화면 */
.dictionary-header {
  margin-bottom: var(--space-6);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.header-content h2 {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.search-section {
  margin-bottom: var(--space-8);
}

.search-container {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2);
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) var(--ease-out);
}

.search-input-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover), 0 0 0 4px rgba(49, 130, 206, 0.1);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text);
  font-family: var(--font-family);
}

.search-input::placeholder {
  color: var(--color-text-tertiary);
}

.search-btn {
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  font-size: var(--text-lg);
  cursor: pointer;
  transition: background-color var(--duration-normal) var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
}

.search-btn:hover {
  background: var(--color-primary-hover);
}

.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-top: var(--space-2);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  max-height: 300px;
  overflow-y: auto;
  display: none;
}

.search-suggestions.show {
  display: block;
}

.suggestion-item {
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--duration-fast) var(--ease-out);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

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

.suggestion-item:hover {
  background: var(--color-secondary);
}

.suggestion-icon {
  font-size: var(--text-lg);
}

.suggestion-text {
  flex: 1;
}

.suggestion-term {
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.suggestion-definition {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.welcome-message {
  text-align: center;
  padding: var(--space-8) 0;
}

.welcome-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
}

.welcome-message h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0 0 var(--space-2) 0;
  color: var(--color-text);
}

.welcome-message p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-6) 0;
}

.popular-terms {
  margin-top: var(--space-8);
}

.popular-terms h4 {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-4) 0;
  color: var(--color-text);
}

.term-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.term-tag {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.term-tag:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.results-count {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.terms-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.terms-header h3 {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.terms-sort {
  display: flex;
  gap: var(--space-2);
}

.sort-btn {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.sort-btn:hover {
  background: var(--color-secondary-hover);
}

.sort-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.results-list,
.terms-list {
  display: grid;
  gap: var(--space-4);
}

.term-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.term-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-info));
  transform: scaleY(0);
  transition: transform var(--duration-normal) var(--ease-out);
}

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

.term-item:hover::before {
  transform: scaleY(1);
}

.term-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.term-icon {
  font-size: var(--text-2xl);
  flex-shrink: 0;
  margin-top: var(--space-1);
}

.term-title {
  flex: 1;
}

.term-name {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin: 0 0 var(--space-2) 0;
  line-height: 1.3;
}

.term-category {
  display: inline-block;
  background: var(--color-info-bg);
  color: var(--color-info);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.term-definition {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0;
}

.term-definition strong {
  color: var(--color-text);
  font-weight: var(--font-weight-semibold);
}

.no-results {
  text-align: center;
  padding: var(--space-8) 0;
}

.no-results-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.no-results h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-2) 0;
  color: var(--color-text);
}

.no-results p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin: 0;
}

/* 결과 화면 */
.result-content {
  text-align: center;
  padding: var(--space-8) 0;
}

.result-card {
  max-width: 500px;
  margin: 0 auto;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.result-card .card__body {
  padding: var(--space-8);
}

.result-card h2 {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin: 0 0 var(--space-8) 0;
}

.score-display {
  margin: var(--space-8) 0;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: white;
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  margin: 0 auto var(--space-6);
  box-shadow: var(--shadow-lg);
  animation: scoreAnimation 1s var(--ease-out);
}

@keyframes scoreAnimation {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.score-details p {
  margin: var(--space-2) 0;
  color: var(--color-text-secondary);
  font-size: var(--text-base);
}

#score-message {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary) !important;
  margin-top: var(--space-4) !important;
}

.result-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

/* 틀린 답안 복습 */
.wrong-answers {
  text-align: left;
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.wrong-answers h3 {
  margin-bottom: var(--space-6);
  color: var(--color-text);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
}

.wrong-item {
  padding: var(--space-6);
  margin-bottom: var(--space-4);
  background: var(--color-error-bg);
  border: 1px solid rgba(229, 62, 62, 0.2);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-error);
}

.wrong-item h4 {
  margin: 0 0 var(--space-3) 0;
  color: var(--color-error);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
}

.wrong-item p {
  margin: var(--space-2) 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-text);
}

.wrong-item .correct-answer {
  color: var(--color-success);
  font-weight: var(--font-weight-medium);
}

/* 유틸리티 클래스 */
.hidden {
  display: none !important;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  .container {
    padding: var(--space-4);
  }
  
  .hero-section h1 {
    font-size: var(--text-3xl);
  }
  
  .hero-stats {
    gap: var(--space-6);
  }
  
  .quiz-types {
    grid-template-columns: 1fr;
  }
  
  .quiz-header {
    flex-direction: column;
    gap: var(--space-4);
    align-items: stretch;
  }
  
  .quiz-progress {
    max-width: none;
  }
  
  .question-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .tf-buttons {
    flex-direction: column;
  }
  
  .result-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .accessibility-controls {
    position: static;
    justify-content: center;
    margin-bottom: var(--space-4);
  }

  /* 사전 화면 반응형 */
  .header-content {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  .search-container {
    max-width: 100%;
  }

  .search-input {
    font-size: var(--text-sm);
  }

  .search-input::placeholder {
    font-size: var(--text-sm);
  }

  .terms-header {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  .terms-sort {
    justify-content: center;
  }

  .term-header {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2);
  }

  .term-icon {
    align-self: center;
  }

  .term-name {
    font-size: var(--text-lg);
  }

  .welcome-message h3 {
    font-size: var(--text-xl);
  }

  .welcome-message p {
    font-size: var(--text-base);
  }
}

@media (max-width: 480px) {
  .hero-section h1 {
    font-size: var(--text-2xl);
  }
  
  .subtitle {
    font-size: var(--text-base);
  }
  
  .question-text {
    font-size: var(--text-base);
  }
  
  .text-input {
    font-size: var(--text-base);
  }
  
  .score-circle {
    width: 100px;
    height: 100px;
    font-size: var(--text-2xl);
  }
}

/* 퀴즈 질문 스타일 개선 */
.question-header {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.question-icon {
  font-size: 2rem;
  min-width: 2.5rem;
  text-align: center;
  background: var(--color-surface);
  border-radius: 10px;
  padding: 0.625rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.question-content {
  flex: 1;
}

.question-title {
  color: var(--color-text);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 0.75rem 0;
  line-height: 1.4;
}

.definition-box {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  border-radius: 10px;
  padding: 1.25rem;
  margin-top: 0.75rem;
  position: relative;
}

.definition-text {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  font-weight: 500;
  margin: 0;
}

.category-hint {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  color: #1e40af;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  margin: 0.5rem 0 1rem 0;
  display: inline-block;
  border: 1px solid #93c5fd;
}

.term-definition-pair {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1rem;
  border: 2px solid var(--color-border);
}

.term-label, .definition-label {
  margin: 0.75rem 0;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.5;
}

.label-icon {
  font-size: 1.125rem;
  margin-top: 0.125rem;
}

.term-label strong, .definition-label strong {
  color: var(--color-text);
  margin-right: 0.5rem;
  min-width: 3rem;
}

.scenario-box {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border: 2px solid #f59e0b;
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.scenario-icon {
  font-size: 1.5rem;
  min-width: 2rem;
  text-align: center;
}

.scenario-text {
  flex: 1;
  font-size: 1rem;
  line-height: 1.6;
  color: #92400e;
  font-weight: 500;
  margin: 0;
}

/* 다크모드 대응 */
[data-theme="dark"] .definition-box {
  background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
  border-color: #6b7280;
}

[data-theme="dark"] .definition-text {
  color: #d1d5db;
}

[data-theme="dark"] .category-hint {
  background: linear-gradient(135deg, #1e3a8a 0%, #3730a3 100%);
  color: #dbeafe;
  border-color: #3730a3;
}

[data-theme="dark"] .term-definition-pair {
  background: var(--color-surface);
  border-color: #6b7280;
}

[data-theme="dark"] .scenario-box {
  background: linear-gradient(135deg, #92400e 0%, #b45309 100%);
  border-color: #d97706;
}

[data-theme="dark"] .scenario-text {
  color: #fde68a;
}

/* 질문 스타일 반응형 */
@media (max-width: 768px) {
  .question-header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .question-icon {
    align-self: center;
    font-size: 2rem;
    min-width: 2.5rem;
    padding: 0.5rem;
  }
  
  .definition-box {
    padding: 1rem;
  }
  
  .scenario-box {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
  }
  
  .scenario-icon {
    align-self: center;
    font-size: 1.25rem;
  }
  
  .term-definition-pair {
    padding: 1rem;
  }
  
  .term-label, .definition-label {
    flex-direction: column;
    gap: 0.25rem;
  }
  
  .label-icon {
    align-self: flex-start;
  }
}

/* 🎯 UX 개선: 공간 효율적인 퀴즈 레이아웃 */

/* 디버깅용 스타일 제거됨 */

/* 퀴즈 화면에서 관리자 패널 숨기기 */
body:has(#quiz-screen.active) .accessibility-controls,
body:has(#result-screen.active) .accessibility-controls,
body:has(#dictionary-screen.active) .accessibility-controls {
    display: none !important;
}

/* 대체 방법: 퀴즈 화면일 때 관리자 패널 숨기기 */
.quiz-mode .accessibility-controls {
    display: none !important;
}

/* 새로운 퀴즈 컨테이너 - 전체 화면 활용 */
.quiz-container {
    max-width: 900px !important;
    margin: 0 auto !important;
    padding: 10px !important;
    height: 100vh !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: space-between !important;
    box-sizing: border-box !important;
}

/* 문제 헤더 - 한 줄로 배치 */
.question-header {
    display: flex !important;
    align-items: baseline !important;
    gap: 10px !important;
    margin-bottom: 10px !important;
    flex-wrap: wrap !important;
}

.question-type {
    margin: 0;
    font-size: 1.4rem;
    color: var(--color-primary);
    font-weight: 600;
}

.question-subtitle {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin: 0;
    font-weight: 400;
}

/* 간격 최적화 */
.question-content {
    margin-bottom: 10px !important;
    flex-grow: 1 !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
}

.answer-options {
    margin-bottom: 10px !important;
}

/* 퀴즈 푸터 - 바닥에 고정, 한 줄로 배치 */
.quiz-footer {
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    margin-top: auto !important;
    padding-top: 10px !important;
    border-top: 1px solid var(--color-border) !important;
}

.quiz-controls {
    display: flex !important;
    gap: 12px !important;
    align-items: center !important;
}

.control-btn {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.2s ease;
    color: var(--color-text-secondary);
}

.control-btn:hover {
    background: var(--color-surface);
    border-color: var(--color-primary);
    color: var(--color-text);
}

/* 진행률 바 최적화 */
.quiz-progress {
    margin-bottom: 20px;
}

/* 피드백 간소화 */
.feedback {
    margin: 10px 0;
    padding: 12px 16px;
    border-radius: 8px;
}

.feedback.correct {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: rgb(21, 128, 61);
}

.feedback.incorrect {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: rgb(153, 27, 27);
}

.feedback h4 {
    margin: 0 0 8px 0;
    font-size: 1rem;
    font-weight: 600;
}

.feedback p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.4;
}

/* 관리자 패널 버튼을 거의 보이지 않게 */
#admin-toggle.admin-tiny-btn {
    position: fixed !important;
    bottom: 2px !important;
    right: 2px !important;
    width: 8px !important;
    height: 8px !important;
    padding: 0 !important;
    font-size: 6px !important;
    border-radius: 0 !important;
    background: transparent !important;
    border: none !important;
    color: rgba(128, 128, 128, 0.1) !important;
    z-index: 999 !important;
    transition: all 0.2s ease !important;
    cursor: pointer !important;
    box-shadow: none !important;
    outline: none !important;
}

#admin-toggle.admin-tiny-btn:hover {
    background: transparent !important;
    color: rgba(128, 128, 128, 0.3) !important;
    transform: scale(1.1) !important;
    box-shadow: none !important;
}

#admin-toggle.admin-tiny-btn:focus {
    background: transparent !important;
    color: rgba(128, 128, 128, 0.3) !important;
    outline: none !important;
    box-shadow: none !important;
}

[data-theme="dark"] #admin-toggle.admin-tiny-btn {
    background: transparent !important;
    border: none !important;
    color: rgba(200, 200, 200, 0.1) !important;
    box-shadow: none !important;
}

[data-theme="dark"] #admin-toggle.admin-tiny-btn:hover {
    background: transparent !important;
    color: rgba(200, 200, 200, 0.3) !important;
    box-shadow: none !important;
}

[data-theme="dark"] #admin-toggle.admin-tiny-btn:focus {
    background: transparent !important;
    color: rgba(200, 200, 200, 0.3) !important;
    outline: none !important;
    box-shadow: none !important;
}

/* 모바일 최적화 - 극도로 컴팩트한 레이아웃 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 5px !important;
        height: 100vh !important;
    }
    
    .question-header {
        gap: 5px !important;
        margin-bottom: 8px !important;
    }
    
    .question-type {
        font-size: 1.1rem !important;
    }
    
    .question-subtitle {
        font-size: 0.85rem !important;
    }
    
    .question-content {
        margin-bottom: 8px !important;
    }
    
    .definition-box {
        padding: 8px !important;
        margin: 6px 0 !important;
        font-size: 0.9rem !important;
    }
    
    .answer-options {
        margin-bottom: 8px !important;
    }
    
    .answer-options .option {
        padding: 6px 10px !important;
        margin-bottom: 4px !important;
        font-size: 0.9rem !important;
    }
    
    .text-input {
        padding: 6px 10px !important;
        font-size: 0.9rem !important;
        margin: 6px 0 !important;
    }
    
    .tf-buttons {
        gap: 6px !important;
        margin: 6px 0 !important;
    }
    
    .tf-button {
        padding: 6px 12px !important;
        font-size: 0.9rem !important;
    }
    
    .category-hint {
        font-size: 0.8rem !important;
        margin-bottom: 6px !important;
    }
    
    .term-definition-pair {
        margin: 6px 0 !important;
        gap: 6px !important;
    }
    
    .quiz-footer {
        padding-top: 8px !important;
        justify-content: center !important;
        gap: 8px !important;
    }
    
    .quiz-controls {
        gap: 8px !important;
    }
    
    .control-btn {
        padding: 6px 10px !important;
        font-size: 0.9rem !important;
    }
    
    .quiz-progress {
        margin-bottom: 8px !important;
    }
    
    .progress-text {
        font-size: 0.8rem !important;
    }
    
    .feedback {
        padding: 8px 10px !important;
        margin: 6px 0 !important;
        font-size: 0.85rem !important;
    }
    
    .feedback h4 {
        font-size: 0.9rem !important;
        margin-bottom: 4px !important;
    }
    
    #admin-toggle.admin-tiny-btn {
        width: 6px !important;
        height: 6px !important;
        font-size: 5px !important;
        bottom: 1px !important;
        right: 1px !important;
    }
}