/* ============================================
   Language Exam Practice - Styles
   Mobile-first, Vietnamese UI, Modern Design
   ============================================ */

/* CSS Variables - Dark Mode (Default) */
/* Core: #232634, Hue: 1, Light max: 100, min: 60 */
:root {
  --color-mode: 'dark';

  /* Background colors - Dark mode */
  --bg-primary: #232634;
  --bg-secondary: #2e3244;
  --bg-tertiary: #3a3f54;
  --bg-elevated: #454b63;
  --glass-bg: rgba(46, 50, 68, 0.85);
  --glass-border: rgba(255, 255, 255, 0.12);

  /* Text colors - High contrast for dark mode */
  --text-primary: #f8f9fc;
  --text-secondary: #c4c9db;
  --text-muted: #8b92a8;
  --text-inverse: #232634;

  /* Input/Field specific - Better visibility */
  --input-bg: #3a3f54;
  --input-border: rgba(255, 255, 255, 0.2);
  --input-text: #f8f9fc;
  --input-placeholder: #8b92a8;

  /* Accent colors - New 2-Color Theme */
  /* Main Color 1: Blue (Matches #E5F0FE/#232634 vibe) */
  --accent-primary: #1e40af;
  /* Darker Blue (Blue 800) */
  /* Main Color 2: Sky (Highlight) */
  --accent-secondary: #0369a1;
  /* Darker Sky */
  --accent: #1e40af;
  --accent-hover: #60a5fa;

  /* Deep Blue Gradient for Dark Mode */
  --accent-gradient: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
  --accent-text: #bfdbfe;
  --bg-hover: #444c67;
  --focus-ring: rgba(96, 165, 250, 0.35);

  /* Status colors */
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --error: #e11d48;
  /* Use Main Color 2 for error */
  --error-bg: rgba(225, 29, 72, 0.15);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-jp: 'Noto Sans JP', serif;
  --font-cn: 'Noto Sans SC', serif;

  --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: 2rem;

  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows - Softer for dark mode */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(59, 130, 246, 0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Z-index */
  --z-overlay: 100;
  --z-modal: 200;
  --z-toast: 300;
}

/* Light Mode - Core: #E5F0FE */
[data-theme="light"] {
  --color-mode: 'light';

  /* Background colors - Light mode */
  --bg-primary: #E5F0FE;
  --bg-secondary: #d4e0f5;
  /* Slightly darker */
  --bg-tertiary: #c3d0e5;
  --bg-elevated: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(229, 240, 254, 0.5);

  /* Text colors - High contrast for light mode */
  --text-primary: #1e2030;
  --text-secondary: #4a4f69;
  --text-muted: #6e7389;
  --text-inverse: #f8f9fc;

  /* Input/Field specific - Better visibility */
  --input-bg: #ffffff;
  --input-border: rgba(0, 0, 0, 0.15);
  --input-text: #1e2030;
  --input-placeholder: #6e7389;

  /* Accent colors - Lighter/Brighter for light mode */
  --accent-primary: #3b82f6;
  /* Blue 500 */
  --accent-secondary: #0ea5e9;
  /* Sky 500 */
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  /* Bright/Light Gradient for Light Mode */
  --accent-gradient: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
  --accent-text: #1e40af;
  /* Dark Blue for readability on light bg */
  --bg-hover: #dce7f7;
  --focus-ring: rgba(37, 99, 235, 0.2);

  /* Status colors - Darker for readability */
  --success: #16a34a;
  --success-bg: rgba(22, 163, 74, 0.12);
  --warning: #d97706;
  --warning-bg: rgba(217, 119, 6, 0.12);
  --error: #dc2626;
  --error-bg: rgba(220, 38, 38, 0.12);

  /* Shadows - Lighter for light mode */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-glow: 0 0 24px rgba(37, 99, 235, 0.25);
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(129, 140, 248, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(167, 139, 250, 0.12) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
  transition: opacity var(--transition-base);
}

[data-theme="light"] body::before {
  background:
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
}

#app {
  min-height: 100vh;
  min-height: 100dvh;
}

/* ============================================
   Screen Management
   ============================================ */
.screen {
  display: none;
  min-height: 100vh;
  min-height: 100dvh;
}

.screen.active {
  display: flex;
  flex-direction: column;
}

/* ============================================
   Glassmorphism
   ============================================ */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
}

.card {
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

/* ============================================
   Login Screen
   ============================================ */
#login-screen {
  justify-content: center;
  align-items: center;
  padding: var(--space-lg);
}

.login-container {
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.logo-section {
  margin-bottom: var(--space-xl);
}

.logo-icon {
  width: 80px;
  height: 80px;
  background: var(--accent-gradient);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  margin: 0 auto var(--space-md);
  box-shadow: var(--shadow-glow);
}

.logo-section h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

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

.login-card {
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
}

.login-card h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.login-desc {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-lg);
}

.login-divider {
  display: flex;
  align-items: center;
  margin: var(--space-lg) 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.login-divider::before,
.login-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--glass-border);
}

.login-divider span {
  padding: 0 var(--space-md);
}

.login-footer {
  margin-top: var(--space-xl);
  color: var(--text-muted);
  font-size: var(--text-xs);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button:focus-visible,
select:focus-visible,
input:focus-visible,
.question-dot:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Loading Spinner */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  vertical-align: middle;
  margin-right: 0.5em;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-secondary);
}

.btn-lg {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-lg);
  width: 100%;
}

.btn-xl {
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--text-xl);
  width: 100%;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
}

.btn-icon-only {
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: var(--text-xl);
  cursor: pointer;
}

.btn-icon,
.play-icon {
  font-size: 1.2em;
}

/* ============================================
   App Header
   ============================================ */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-small {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-family: var(--font-jp);
}

.header-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.user-badge {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ============================================
   Home Screen
   ============================================ */
.home-content {
  flex: 1;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.welcome-section h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-xs);
}

.welcome-section p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.card h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  font-weight: 500;
}

/* Exam Tabs */
.exam-tabs {
  display: flex;
  gap: var(--space-sm);
}

.exam-tab-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.exam-tab-wrapper:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.exam-tab-wrapper.active {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.1);
}

.exam-tab-wrapper[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
}

.exam-tab-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.level-select {
  width: 100%;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-family: inherit;
  cursor: pointer;
  text-align: center;
}

.level-select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.level-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.exam-flag {
  font-size: var(--text-xl);
}

.exam-name {
  font-weight: 500;
}

.coming-soon {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--warning);
  color: var(--text-inverse);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-full);
}

/* Exam Section Selector */
.exam-section-selector {
  margin-top: var(--space-md);
  margin-bottom: var(--space-md);
  animation: slideDown 0.3s ease-out;
}

.exam-section-selector h4 {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.section-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.section-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  gap: var(--space-xs);
  min-height: 80px;
}

.section-option:hover {
  background: var(--bg-hover);
  transform: translateY(-2px);
}

.section-option.selected {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary);
}

.section-option i {
  font-size: var(--text-xl);
  margin-bottom: 4px;
}

.section-option span {
  font-size: var(--text-sm);
  font-weight: 500;
  text-align: center;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

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

/* Mode Cards */
.mode-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mode-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
  width: 100%;
}

.mode-card.selected {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.mode-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.mode-info h4 {
  font-size: var(--text-base);
  margin-bottom: 2px;
  color: var(--text-primary);
}

.mode-info p {
  font-size: var(--text-sm);
  color: var(--text-primary);
  opacity: 0.85;
}

/* Provider Settings */
.provider-settings {
  overflow: hidden;
}

.provider-settings.collapsed .settings-content {
  display: none;
}

.settings-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  cursor: pointer;
}

.toggle-arrow {
  transition: transform var(--transition-fast);
}

.provider-settings:not(.collapsed) .toggle-arrow {
  transform: rotate(180deg);
}

.settings-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--glass-border);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.setting-group label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.setting-group select {
  padding: var(--space-sm) var(--space-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--input-text);
  font-size: var(--text-base);
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.setting-group select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.setting-group select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.setting-group input {
  padding: var(--space-sm) var(--space-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--input-text);
  font-size: var(--text-base);
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.setting-group input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(104, 127, 255, 0.14);
}

.admin-panel {
  padding: var(--space-md);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01)),
    var(--bg-secondary);
}

.admin-panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.admin-panel-header h4 {
  margin: 0 0 var(--space-xs);
  font-size: var(--text-lg);
  color: var(--text-primary);
}

.admin-panel-header p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  padding: 0 var(--space-sm);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 700;
  white-space: nowrap;
}

.status-badge.neutral {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
}

.status-badge.success {
  color: #0d5f44;
  background: rgba(101, 220, 170, 0.28);
}

.status-badge.warning {
  color: #7a4d00;
  background: rgba(255, 204, 102, 0.28);
}

.status-badge.error {
  color: #7d1f1f;
  background: rgba(255, 123, 123, 0.24);
}

.admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.admin-summary {
  display: grid;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.admin-summary p {
  margin: 0;
}

.admin-code-block {
  margin: 0 0 var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: rgba(8, 12, 24, 0.85);
  color: #d7e2ff;
  font-size: var(--text-sm);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.admin-health-results {
  display: grid;
  gap: var(--space-sm);
}

.admin-health-item {
  display: grid;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}

.admin-health-item header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.admin-health-item strong {
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.admin-health-meta,
.admin-health-error {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

@media (max-width: 640px) {
  .admin-panel-header,
  .admin-health-item header {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Quick Links */
.quick-links {
  display: flex;
  gap: var(--space-md);
  margin-top: auto;
}

.quick-link {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-link:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.quick-link span:first-child {
  font-size: var(--text-xl);
}

/* ============================================
   Loading Screen
   ============================================ */
#loading-screen {
  justify-content: center;
  align-items: center;
}

.loading-container {
  text-align: center;
}

.loader-icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
  color: var(--accent-primary);
}

.progress-container {
  width: 100%;
  max-width: 300px;
  margin: var(--space-lg) auto 0;
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-sm);
  font-variant-numeric: tabular-nums;
}



#loading-text {
  font-size: var(--text-lg);
  margin-bottom: var(--space-sm);
}

.loading-hint {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* ============================================
   Test Screen
   ============================================ */
#test-screen {
  display: none;
}

#test-screen.active {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.test-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  flex-shrink: 0;
  z-index: 50;
}

.timer-bar {
  display: flex;
  gap: var(--space-lg);
}

.timer {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timer-label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.timer-value {
  font-size: var(--text-lg);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.timer.warning .timer-value {
  color: var(--warning);
  animation: pulse 1s ease-in-out infinite;
}

.timer.danger .timer-value {
  color: var(--error);
  animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

/* Test Actions Bar - sticky at top */
.test-actions {
  position: sticky;
  top: 0;
  z-index: 45;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}

/* Mondai Navigation (now in footer) */
.mondai-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  flex-shrink: 0;
}

.nav-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--text-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.nav-btn:not(:disabled):hover {
  background: var(--accent-primary);
}

.mondai-progress {
  font-size: var(--text-lg);
  font-weight: 600;
}

.mondai-sep {
  color: var(--text-muted);
  margin: 0 var(--space-xs);
}

/* Test Content */
.test-content {
  flex: 1;
  padding: var(--space-md);
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

.mondai-header {
  margin-bottom: var(--space-lg);
}

#mondai-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.instructions {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* Passage Container - sticky with internal scroll for reading sections */
.passage-container {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
  /* Sticky behavior for reading passages */
  position: sticky;
  top: 56px;
  /* Below header + actions bar */
  z-index: 20;
  max-height: 40vh;
  overflow-y: auto;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.passage-container.hidden {
  display: none;
}

.passage-controls {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.passage-text {
  font-family: var(--font-jp);
  font-size: var(--text-base);
  line-height: 1.8;
  white-space: pre-wrap;
}

.passage-text.zh {
  font-family: var(--font-cn);
}

/* Questions Container */
.questions-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.question-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.question-number {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.question-prompt {
  font-size: var(--text-base);
  margin-bottom: var(--space-md);
  font-family: var(--font-jp);
  line-height: 1.6;
}

.question-prompt.zh {
  font-family: var(--font-cn);
}

/* Emphasis highlight for kanji/vocab (converted from [[...]] or <u>) */
.hl {
  font-weight: 700;
  background: linear-gradient(transparent 60%, rgba(99, 102, 241, 0.3) 40%);
  padding: 0 2px;
  border-radius: 2px;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.choice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  width: 100%;
  font-family: var(--font-jp);
}

.choice.zh {
  font-family: var(--font-cn);
}

.choice:hover {
  border-color: var(--glass-border);
}

.choice.selected {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.choice-letter {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-sm);
}

.choice.selected .choice-letter {
  background: var(--accent-primary);
}

.choice-text {
  flex: 1;
  padding-top: 2px;
}

/* Audio Player */
/* Audio Player */
.audio-player {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);

  /* Sticky behavior for mobile */
  position: sticky;
  top: 0;
  z-index: 20;
  max-height: 40vh;
  overflow-y: auto;
}

.audio-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.audio-script {
  margin-top: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-family: var(--font-jp);
  font-size: var(--text-sm);
  line-height: 1.6;
  max-height: 200px;
  overflow-y: auto;
}

.audio-script.hidden {
  display: none;
}

.audio-player.hidden {
  display: none;
}

.audio-status {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* Test Footer */
.test-footer {
  padding: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-shrink: 0;
  border-top: 1px solid var(--glass-border);
}

.question-dots {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  flex: 1;
}

.question-dot {
  appearance: none;
  width: 14px;
  height: 14px;
  padding: 0;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 2px solid var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.question-dot.answered {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 6px rgba(99, 102, 241, 0.5);
}

.question-dot.current {
  border-color: var(--text-primary);
  transform: scale(1.2);
}

/* ============================================
   Focus Mode Overlay
   ============================================ */
.focus-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  transition: opacity var(--transition-base);
}

.focus-overlay.hidden {
  display: none;
}

.focus-content {
  flex: 1;
  padding: var(--space-xl);
  overflow-y: auto;
  position: relative;
}

.btn-close-focus {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: none;
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: var(--text-xl);
  cursor: pointer;
}

.focus-passage {
  font-family: var(--font-jp);
  font-size: var(--text-xl);
  line-height: 2;
  max-width: 800px;
  margin: 0 auto;
}

/* ============================================
   Review Screen
   ============================================ */
.review-content {
  flex: 1;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* Score Summary */
.score-summary {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.score-circle {
  position: relative;
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}

.score-circle svg {
  transform: rotate(-90deg);
}

.score-bg {
  fill: none;
  stroke: var(--bg-tertiary);
  stroke-width: 8;
}

.score-ring {
  fill: none;
  stroke: url(#scoreGradient);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 1s ease;
}

.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#score-value {
  font-size: var(--text-3xl);
  font-weight: 700;
}

#score-max {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.score-details {
  flex: 1;
}

.score-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.score-group-item {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
}

.score-group-label {
  color: var(--text-secondary);
}

.recommendation {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-style: italic;
}

/* Weak Areas */
.weak-areas h3 {
  margin-bottom: var(--space-sm);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  padding: var(--space-xs) var(--space-sm);
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid var(--error);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--error);
}

/* Review Questions */
.review-questions h3 {
  margin-bottom: var(--space-md);
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.review-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border-left: 4px solid var(--success);
}

.review-item.incorrect {
  border-left-color: var(--error);
}

.review-item.unanswered {
  border-left-color: #f59e0b;
}

.review-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.review-item-id {
  font-weight: 600;
}

.review-status {
  font-size: var(--text-sm);
}

.review-status.correct {
  color: var(--success);
}

.review-status.incorrect {
  color: var(--error);
}

.review-status.unanswered {
  color: #b45309;
}

.review-prompt {
  font-family: var(--font-jp);
  margin-bottom: var(--space-md);
}

.review-feedback {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding-top: var(--space-md);
  border-top: 1px solid var(--glass-border);
}

.feedback-section {
  margin-bottom: var(--space-md);
}

.feedback-section h4 {
  font-size: var(--text-sm);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.examples-list {
  list-style: none;
  padding: 0;
  font-family: var(--font-jp);
}

.examples-list li {
  padding: var(--space-xs) 0;
}

/* Review Answer Styles */
.review-choice {
  cursor: default !important;
}

.choice-body {
  flex: 1;
  min-width: 0;
}

.choice-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.choice-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.2;
}

.choice-badge-selected {
  background: rgba(59, 130, 246, 0.12);
  color: #1d4ed8;
}

.choice-badge-correct {
  background: rgba(34, 197, 94, 0.14);
  color: #15803d;
}

.choice-badge-unanswered {
  background: rgba(245, 158, 11, 0.16);
  color: #b45309;
}

.review-choice.user-selected {
  background: rgba(99, 102, 241, 0.15);
}

.review-choice.correct-answer {
  border: 1px solid var(--success) !important;
  background-color: var(--success-bg);
}

.review-choice.correct-answer .choice-letter {
  background: var(--success);
  color: white;
}

.review-choice.correct-answer-unanswered {
  border: 1px solid #f59e0b !important;
  background-color: rgba(245, 158, 11, 0.10);
}

.review-choice.correct-answer-unanswered .choice-letter {
  background: #f59e0b;
  color: white;
}

.review-choice.wrong-answer {
  border: 1px solid var(--error) !important;
  background-color: var(--error-bg);
}

.review-choice.wrong-answer .choice-letter {
  background: var(--error);
  color: white;
}

/* ============================================
   History Screen
   ============================================ */
.history-content,
.mistakes-content {
  flex: 1;
  padding: var(--space-md);
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.history-list,
.mistakes-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Mistake Item Styles */
.mistake-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border-left: 4px solid var(--error);
}

.mistake-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 0;
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  margin-bottom: var(--space-sm);
}

.mistake-meta {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 600;
}

.expand-icon {
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.mistake-prompt {
  font-family: var(--font-jp);
  margin-bottom: var(--space-sm);
}

.mistake-detail {
  padding-top: var(--space-md);
  border-top: 1px solid var(--glass-border);
  margin-top: var(--space-sm);
}

.mistake-detail.hidden {
  display: none;
}

.mistake-feedback {
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.history-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-item:hover {
  background: var(--bg-tertiary);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.history-exam {
  font-weight: 600;
}

.history-date {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.history-score {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--accent-primary);
}

.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}

.empty-state.hidden {
  display: none;
}

/* ============================================
   Grammar Screen
   ============================================ */
.grammar-content {
  flex: 1;
  padding: var(--space-md);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  gap: var(--space-lg);
  overflow: hidden;
}

.grammar-list {
  flex: 1;
  overflow-y: auto;
  padding-right: var(--space-sm);
}

.grammar-item {
  display: block;
  width: 100%;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  appearance: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.grammar-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--glass-border);
}

.grammar-item h3 {
  font-family: var(--font-jp);
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
  color: var(--accent-primary);
}

.mistake-header:focus-visible,
.grammar-item:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.grammar-meaning {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Grammar Detail Panel */
.grammar-detail {
  width: 400px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
}

.grammar-detail.hidden {
  display: none;
}

.detail-content {
  padding: var(--space-lg);
  overflow-y: auto;
  flex: 1;
}

.btn-close-detail {
  align-self: flex-end;
  margin: var(--space-sm);
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: var(--text-xl);
}

.grammar-section {
  margin-bottom: var(--space-lg);
}

.grammar-section strong {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  text-transform: uppercase;
}

#grammar-examples ul {
  list-style: none;
  padding: 0;
}

#grammar-examples li {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
  border-left: 2px solid var(--accent-primary);
}

/* Responsive Grammar */
@media (max-width: 768px) {
  .grammar-content {
    flex-direction: column;
  }

  .grammar-detail {
    position: fixed;
    inset: 0;
    width: 100%;
    z-index: 100;
    border-radius: 0;
  }
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: min(calc(100vw - (var(--space-md) * 2)), 420px);
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease;
}

.toast.error {
  border-color: var(--error);
}

.toast.success {
  border-color: var(--success);
}

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

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

/* ============================================
   Responsive - Desktop
   ============================================ */
@media (min-width: 768px) {
  .mode-cards {
    flex-direction: row;
  }

  .mode-card {
    flex: 1;
    flex-direction: column;
    text-align: center;
  }

  .test-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
  }

  .mondai-header {
    grid-column: 1 / -1;
  }

  .passage-container {
    position: sticky;
    top: 56px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
  }

  .audio-player {
    grid-column: 1 / 1;
  }

  .score-summary {
    padding: var(--space-xl);
  }

  .score-circle {
    width: 160px;
    height: 160px;
  }
}

/* ============================================
   Utilities
   ============================================ */
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================
   Modal Styles
   ============================================ */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 400px;
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  text-align: center;
}

.modal-content:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.modal-content h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.email-input,
.otp-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--input-text);
  font-size: var(--text-lg);
  text-align: center;
  margin-bottom: var(--space-md);
}

.otp-input {
  letter-spacing: 0.5em;
  font-family: monospace;
  font-size: var(--text-2xl);
}

.email-input:focus,
.otp-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.modal-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
}

.modal-actions .btn {
  flex: 1;
}

.error-text {
  color: var(--error);
  font-size: var(--text-sm);
  margin-top: var(--space-sm);
}

.error-text.hidden {
  display: none;
}

/* Audio Player Improvements */
.audio-progress-container {
  width: 100%;
  margin-top: 8px;
}

.audio-seek {
  width: 100%;
  cursor: pointer;
  accent-color: var(--accent-primary);
}

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

.audio-time {
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Footer Buttons */
.footer-buttons {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
  padding: var(--space-sm) var(--space-md);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: var(--glass-border);
}

.btn-ghost i {
  margin-right: var(--space-xs);
}

/* Grading Options Modal */
.grading-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.grading-option {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
  width: 100%;
}

.grading-option:hover {
  border-color: var(--glass-border);
  transform: translateY(-2px);
}

.grading-option .option-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: var(--text-xl);
  color: var(--accent-primary);
}

.grading-option .option-icon.ai {
  background: var(--accent-gradient);
  color: white;
}

.grading-option .option-info h4 {
  font-size: var(--text-base);
  margin-bottom: 2px;
  color: var(--text-primary);
}

.grading-option .option-info p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0;
}

.btn-full {
  width: 100%;
  margin-top: var(--space-sm);
}

/* Nickname Input */
.modal-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--input-text);
  font-size: var(--text-lg);
  text-align: center;
  margin-bottom: var(--space-md);
  transition: all var(--transition-fast);
}

.modal-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Utility Classes */
.text-muted {
  color: var(--text-muted);
}

/* Audio Note */
.audio-note {
  font-size: var(--text-xs);
  margin-top: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Navigation Loading Indicator */
.nav-loading {
  font-size: var(--text-xs);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

/* ============================================
   Fullscreen Loading Overlay
   ============================================ */
.fullscreen-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.fullscreen-loader.hidden {
  display: none;
}

.fullscreen-loader-content {
  text-align: center;
  color: white;
}

.fullscreen-loader-content .loader-spinner {
  margin-bottom: var(--space-lg);
  color: var(--accent-primary);
}

.fullscreen-loader-content p {
  font-size: var(--text-lg);
  font-weight: 500;
}

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

/* ============================================
   Emphasis Highlight (.hl)
   Used for [[word]] markers and legacy <u> tags
   ============================================ */
strong.hl {
  font-weight: 700;
  color: var(--accent-primary);
  background: linear-gradient(to bottom, transparent 60%, rgba(99, 102, 241, 0.2) 60%);
  padding: 0 2px;
  border-radius: 2px;
}

[data-theme="light"] strong.hl {
  color: var(--accent-hover);
  background: linear-gradient(to bottom, transparent 60%, rgba(37, 99, 235, 0.15) 60%);
}

/* Mobile passage sticky */
@media (max-width: 767px) {
  .passage-container {
    position: sticky;
    top: 0;
    max-height: 40vh;
    overflow-y: auto;
    z-index: 10;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--glass-border);
    margin: 0 calc(-1 * var(--space-md));
    padding: var(--space-sm) var(--space-md);
  }
}

/* ============================================
   Review UI: Answer Highlighting + Explanation Toggle
   ============================================ */
.review-item {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  border-left: 4px solid var(--glass-border);
  transition: border-color 0.2s;
}

.review-item.incorrect {
  border-left-color: #ef4444;
}

.review-item.unanswered {
  border-left-color: #f59e0b;
}

.review-item:not(.incorrect):not(.unanswered) {
  border-left-color: #22c55e;
}

.review-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.review-item-id {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.review-status {
  font-weight: 600;
  font-size: 0.85rem;
  padding: 2px 10px;
  border-radius: 6px;
}

.review-status.correct {
  color: #22c55e;
  background: rgba(34, 197, 94, 0.12);
}

.review-status.incorrect {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.12);
}

.review-status.unanswered {
  color: #b45309;
  background: rgba(245, 158, 11, 0.16);
}

.review-prompt {
  margin-bottom: 10px;
  line-height: 1.6;
}

/* Choice highlighting in review */
.review-choice {
  padding: 8px 12px;
  margin: 4px 0;
  border-radius: 8px;
  border: 1.5px solid transparent;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.15s;
}

.review-choice.correct-answer {
  background: rgba(34, 197, 94, 0.10);
  border-color: #22c55e;
}

.review-choice.correct-answer .choice-letter {
  background: #22c55e;
  color: #fff;
}

.review-choice.correct-answer-unanswered {
  background: rgba(245, 158, 11, 0.12);
  border-color: #f59e0b;
}

.review-choice.correct-answer-unanswered .choice-letter {
  background: #f59e0b;
  color: #fff;
}

.review-choice.wrong-answer {
  background: rgba(239, 68, 68, 0.10);
  border-color: #ef4444;
}

.review-choice.wrong-answer .choice-letter {
  background: #ef4444;
  color: #fff;
}

.review-choice.user-selected:not(.wrong-answer):not(.correct-answer) {
  border-color: var(--accent);
}

/* Correct answer inline label */
.correct-answer-label {
  margin-top: 8px;
  padding: 6px 12px;
  background: rgba(34, 197, 94, 0.08);
  border-radius: 8px;
  font-size: 0.9rem;
  color: #22c55e;
  font-weight: 500;
}

.correct-answer-label.unanswered {
  background: rgba(245, 158, 11, 0.12);
  color: #b45309;
}

/* Explanation toggle */
.explanation-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

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

.explanation-toggle .toggle-icon {
  transition: transform 0.2s;
  font-size: 0.75rem;
}

.explanation-toggle.expanded .toggle-icon {
  transform: rotate(90deg);
}

.review-feedback {
  margin-top: 10px;
  padding: 12px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.review-feedback .feedback-section {
  margin-bottom: 8px;
}

.review-feedback .feedback-section:last-child {
  margin-bottom: 0;
}

.review-feedback h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0 0 4px;
}

.review-feedback p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

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