/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
  /* Colors */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  --danger-gradient: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
  --warning-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);

  --bg-dark: #0f0f1a;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.1);
  --bg-glass: rgba(255, 255, 255, 0.08);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);

  --border-glass: rgba(255, 255, 255, 0.1);

  --success: #38ef7d;
  --danger: #f45c43;
  --warning: #ffd93d;

  /* Shadows */
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  font-size: 16px;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ===================================
   Screen Management
   =================================== */
.screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  overflow-y: auto;
  z-index: 1;
}

.screen.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-md);
  padding-bottom: var(--spacing-xl);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* クイズ画面のコンテナ最適化 */
#quiz-screen .container {
  height: 100vh;
  min-height: auto;
  overflow-y: auto;
}

/* ===================================
   Title Screen
   =================================== */
.title-header {
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.logo-icon {
  font-size: 3rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Sections */
section {
  margin-bottom: var(--spacing-lg);
}

section h2 {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.section-icon {
  font-size: 1.2rem;
}

/* Region Buttons */
.region-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.region-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.region-btn:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.region-btn.selected {
  background: var(--primary-gradient);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* Difficulty Select */
.difficulty-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  backdrop-filter: blur(10px);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.2rem;
}

.difficulty-select option {
  background: #1a1a2e;
  color: var(--text-primary);
}

/* Start Button */
.start-btn {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  margin-top: var(--spacing-md);
}

.start-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.btn-icon {
  font-size: 1.4rem;
}

/* Game Info */
.game-info {
  margin-top: auto;
  padding-top: var(--spacing-lg);
  text-align: center;
}

.game-info p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
}

/* ===================================
   Quiz Screen
   =================================== */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  margin-bottom: var(--spacing-md);
}

.progress-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.region-tag {
  background: var(--primary-gradient);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
}

.progress-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.score-display {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--bg-glass);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
}

.score-icon {
  font-size: 1.2rem;
}

/* Question Card */
.question-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  backdrop-filter: blur(20px);
  margin-bottom: var(--spacing-md);
}

.item-display {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.difficulty-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.difficulty-badge.easy {
  background: rgba(56, 239, 125, 0.2);
  color: var(--success);
}

.difficulty-badge.medium {
  background: rgba(255, 217, 61, 0.2);
  color: var(--warning);
}

.difficulty-badge.hard {
  background: rgba(244, 92, 67, 0.2);
  color: var(--danger);
}

.item-name {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: var(--spacing-sm);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.accuracy-info {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.question-text {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

/* Choices */
.choices-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
}

.choice-btn {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 2px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.choice-btn:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: rgba(102, 126, 234, 0.5);
  transform: translateX(5px);
}

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

.choice-btn.correct {
  background: var(--success-gradient);
  border-color: transparent;
  animation: pulse 0.5s ease;
}

.choice-btn.incorrect {
  background: var(--danger-gradient);
  border-color: transparent;
  animation: shake 0.5s ease;
}

@keyframes pulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.02);
  }
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-5px);
  }

  75% {
    transform: translateX(5px);
  }
}

/* Feedback */
.feedback {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
}

.feedback.correct {
  background: rgba(56, 239, 125, 0.1);
  border: 1px solid rgba(56, 239, 125, 0.3);
}

.feedback.incorrect {
  background: rgba(244, 92, 67, 0.1);
  border: 1px solid rgba(244, 92, 67, 0.3);
}

.feedback p {
  font-size: 1.1rem;
  font-weight: 600;
}

.feedback .hint {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* Next Button */
.next-btn {
  width: 100%;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

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

/* ===================================
   Result Screen
   =================================== */
.result-header {
  text-align: center;
  padding: var(--spacing-lg) 0;
}

.result-header h1 {
  font-size: 2rem;
  font-weight: 900;
}

/* Score Card */
.score-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(20px);
}

.score-circle {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.score-number {
  font-size: 3rem;
  font-weight: 900;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-divider {
  margin: 0 0.2em;
  opacity: 0.5;
}

.score-label {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.percentage {
  font-size: 2rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: var(--spacing-sm);
}

.result-comment {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Hardest Items */
.hardest-section,
.history-section {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.hardest-list,
.history-list {
  list-style: none;
}

.hardest-list li {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-glass);
}

.hardest-list li:last-child {
  border-bottom: none;
}

.hardest-list .rank {
  width: 2rem;
  font-weight: 700;
  color: var(--text-muted);
}

.hardest-list .name {
  flex: 1;
  font-weight: 500;
}

.hardest-list .rate {
  font-weight: 700;
  color: var(--danger);
}

.no-data {
  color: var(--text-muted);
  text-align: center;
  padding: var(--spacing-md);
}

/* Answer History */
.history-list li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-glass);
}

.history-list li:last-child {
  border-bottom: none;
}

.history-list .status-icon {
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
}

.history-list li.correct .status-icon {
  background: var(--success);
  color: var(--bg-dark);
}

.history-list li.incorrect .status-icon {
  background: var(--danger);
  color: white;
}

.history-list .item-name {
  font-size: 1rem;
  font-weight: 500;
  background: none;
  -webkit-text-fill-color: var(--text-primary);
}

.history-list .arrow {
  color: var(--text-muted);
}

.history-list .category {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.action-btn {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-normal);
}

.action-btn.primary {
  background: var(--primary-gradient);
  color: var(--text-primary);
}

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

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

/* ===================================
   Notifications
   =================================== */
.notification {
  position: fixed;
  top: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 1000;
  animation: slideDown 0.3s ease;
}

.notification.warning {
  background: var(--warning-gradient);
  color: var(--bg-dark);
}

.notification.error {
  background: var(--danger-gradient);
  color: white;
}

.notification.fade-out {
  animation: fadeOut 0.3s ease forwards;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .logo h1 {
    font-size: 2rem;
  }

  .item-name {
    font-size: 2rem;
  }

  .score-number {
    font-size: 2.5rem;
  }

  .result-actions {
    flex-direction: column;
  }
}

/* ===================================
   Scrollbar
   =================================== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-glass);
  border-radius: 4px;
}

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

/* ===================================
   Language Toggle
   =================================== */
.lang-toggle {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 1000;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.lang-toggle:hover {
  background: var(--bg-card-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-sm);
}

.lang-toggle:active {
  transform: scale(0.98);
}

/* ===================================
   New Region Selection UI
   =================================== */
.main-region {
  margin-bottom: var(--spacing-md);
}

.region-btn.main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  width: 100%;
  padding: var(--spacing-lg);
  font-size: 1.1rem;
}

.region-btn.main .region-icon {
  font-size: 2.5rem;
}

.region-btn.main .region-name {
  font-size: 1.3rem;
  font-weight: 700;
}

.region-btn.main .region-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.region-btn.main.selected .region-desc {
  color: rgba(255, 255, 255, 0.8);
}

/* Exception regions toggle */
.exception-regions {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.exception-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-glass);
  cursor: pointer;
  list-style: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: all var(--transition-normal);
}

.exception-toggle::-webkit-details-marker {
  display: none;
}

.exception-toggle:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.exception-toggle .toggle-icon {
  font-size: 1.1rem;
}

.exception-toggle .toggle-arrow {
  margin-left: auto;
  transition: transform var(--transition-normal);
}

.exception-regions[open] .toggle-arrow {
  transform: rotate(180deg);
}

.exception-note {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.85rem;
  color: var(--text-muted);
  background: rgba(255, 165, 0, 0.1);
  border-bottom: 1px solid var(--border-glass);
}

.region-grid.exception {
  padding: var(--spacing-sm);
}

.region-grid.exception .region-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--spacing-sm);
  font-size: 0.9rem;
}

.region-grid.exception .region-btn .region-diff {
  font-size: 0.75rem;
  color: var(--warning);
  font-weight: 400;
}